[16] | 1 | /******************************************************************** |
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| 2 | * * |
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| 3 | * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * |
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| 4 | * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * |
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| 5 | * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * |
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| 6 | * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * |
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| 7 | * * |
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| 8 | * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 * |
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| 9 | * by the Xiph.Org Foundation http://www.xiph.org/ * |
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| 10 | * * |
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| 11 | ******************************************************************** |
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| 12 | |
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| 13 | function: stdio-based convenience library for opening/seeking/decoding |
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| 14 | last mod: $Id: vorbisfile.c 13294 2007-07-24 01:08:23Z xiphmont $ |
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| 15 | |
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| 16 | ********************************************************************/ |
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| 17 | |
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| 18 | #include <stdlib.h> |
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| 19 | #include <stdio.h> |
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| 20 | #include <errno.h> |
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| 21 | #include <string.h> |
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| 22 | #include <math.h> |
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| 23 | |
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| 24 | #include "vorbis/codec.h" |
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| 25 | #include "vorbis/vorbisfile.h" |
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| 26 | |
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| 27 | #include "os.h" |
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| 28 | #include "misc.h" |
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| 29 | |
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| 30 | /* A 'chained bitstream' is a Vorbis bitstream that contains more than |
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| 31 | one logical bitstream arranged end to end (the only form of Ogg |
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| 32 | multiplexing allowed in a Vorbis bitstream; grouping [parallel |
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| 33 | multiplexing] is not allowed in Vorbis) */ |
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| 34 | |
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| 35 | /* A Vorbis file can be played beginning to end (streamed) without |
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| 36 | worrying ahead of time about chaining (see decoder_example.c). If |
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| 37 | we have the whole file, however, and want random access |
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| 38 | (seeking/scrubbing) or desire to know the total length/time of a |
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| 39 | file, we need to account for the possibility of chaining. */ |
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| 40 | |
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| 41 | /* We can handle things a number of ways; we can determine the entire |
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| 42 | bitstream structure right off the bat, or find pieces on demand. |
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| 43 | This example determines and caches structure for the entire |
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| 44 | bitstream, but builds a virtual decoder on the fly when moving |
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| 45 | between links in the chain. */ |
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| 46 | |
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| 47 | /* There are also different ways to implement seeking. Enough |
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| 48 | information exists in an Ogg bitstream to seek to |
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| 49 | sample-granularity positions in the output. Or, one can seek by |
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| 50 | picking some portion of the stream roughly in the desired area if |
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| 51 | we only want coarse navigation through the stream. */ |
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| 52 | |
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| 53 | /************************************************************************* |
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| 54 | * Many, many internal helpers. The intention is not to be confusing; |
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| 55 | * rampant duplication and monolithic function implementation would be |
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| 56 | * harder to understand anyway. The high level functions are last. Begin |
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| 57 | * grokking near the end of the file */ |
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| 58 | |
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| 59 | /* read a little more data from the file/pipe into the ogg_sync framer |
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| 60 | */ |
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| 61 | #define CHUNKSIZE 65536 |
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| 62 | |
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| 63 | static long _get_data(OggVorbis_File *vf){ |
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| 64 | errno=0; |
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| 65 | if(!(vf->callbacks.read_func))return(-1); |
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| 66 | if(vf->datasource){ |
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| 67 | char *buffer=ogg_sync_buffer(&vf->oy,CHUNKSIZE); |
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| 68 | long bytes=(vf->callbacks.read_func)(buffer,1,CHUNKSIZE,vf->datasource); |
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| 69 | if(bytes>0)ogg_sync_wrote(&vf->oy,bytes); |
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| 70 | if(bytes==0 && errno)return(-1); |
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| 71 | return(bytes); |
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| 72 | }else |
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| 73 | return(0); |
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| 74 | } |
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| 75 | |
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| 76 | /* save a tiny smidge of verbosity to make the code more readable */ |
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| 77 | static int _seek_helper(OggVorbis_File *vf,ogg_int64_t offset){ |
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| 78 | if(vf->datasource){ |
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| 79 | if(!(vf->callbacks.seek_func)|| |
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| 80 | (vf->callbacks.seek_func)(vf->datasource, offset, SEEK_SET) == -1) |
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| 81 | return OV_EREAD; |
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| 82 | vf->offset=offset; |
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| 83 | ogg_sync_reset(&vf->oy); |
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| 84 | }else{ |
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| 85 | /* shouldn't happen unless someone writes a broken callback */ |
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| 86 | return OV_EFAULT; |
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| 87 | } |
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| 88 | return 0; |
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| 89 | } |
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| 90 | |
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| 91 | /* The read/seek functions track absolute position within the stream */ |
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| 92 | |
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| 93 | /* from the head of the stream, get the next page. boundary specifies |
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| 94 | if the function is allowed to fetch more data from the stream (and |
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| 95 | how much) or only use internally buffered data. |
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| 96 | |
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| 97 | boundary: -1) unbounded search |
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| 98 | 0) read no additional data; use cached only |
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| 99 | n) search for a new page beginning for n bytes |
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| 100 | |
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| 101 | return: <0) did not find a page (OV_FALSE, OV_EOF, OV_EREAD) |
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| 102 | n) found a page at absolute offset n */ |
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| 103 | |
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| 104 | static ogg_int64_t _get_next_page(OggVorbis_File *vf,ogg_page *og, |
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| 105 | ogg_int64_t boundary){ |
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| 106 | if(boundary>0)boundary+=vf->offset; |
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| 107 | while(1){ |
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| 108 | long more; |
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| 109 | |
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| 110 | if(boundary>0 && vf->offset>=boundary)return(OV_FALSE); |
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| 111 | more=ogg_sync_pageseek(&vf->oy,og); |
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| 112 | |
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| 113 | if(more<0){ |
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| 114 | /* skipped n bytes */ |
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| 115 | vf->offset-=more; |
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| 116 | }else{ |
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| 117 | if(more==0){ |
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| 118 | /* send more paramedics */ |
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| 119 | if(!boundary)return(OV_FALSE); |
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| 120 | { |
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| 121 | long ret=_get_data(vf); |
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| 122 | if(ret==0)return(OV_EOF); |
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| 123 | if(ret<0)return(OV_EREAD); |
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| 124 | } |
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| 125 | }else{ |
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| 126 | /* got a page. Return the offset at the page beginning, |
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| 127 | advance the internal offset past the page end */ |
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| 128 | ogg_int64_t ret=vf->offset; |
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| 129 | vf->offset+=more; |
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| 130 | return(ret); |
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| 131 | |
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| 132 | } |
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| 133 | } |
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| 134 | } |
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| 135 | } |
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| 136 | |
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| 137 | /* find the latest page beginning before the current stream cursor |
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| 138 | position. Much dirtier than the above as Ogg doesn't have any |
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| 139 | backward search linkage. no 'readp' as it will certainly have to |
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| 140 | read. */ |
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| 141 | /* returns offset or OV_EREAD, OV_FAULT */ |
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| 142 | static ogg_int64_t _get_prev_page(OggVorbis_File *vf,ogg_page *og){ |
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| 143 | ogg_int64_t begin=vf->offset; |
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| 144 | ogg_int64_t end=begin; |
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| 145 | ogg_int64_t ret; |
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| 146 | ogg_int64_t offset=-1; |
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| 147 | |
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| 148 | while(offset==-1){ |
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| 149 | begin-=CHUNKSIZE; |
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| 150 | if(begin<0) |
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| 151 | begin=0; |
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| 152 | |
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| 153 | ret=_seek_helper(vf,begin); |
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| 154 | if(ret)return(ret); |
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| 155 | |
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| 156 | while(vf->offset<end){ |
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| 157 | ret=_get_next_page(vf,og,end-vf->offset); |
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| 158 | if(ret==OV_EREAD)return(OV_EREAD); |
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| 159 | if(ret<0){ |
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| 160 | break; |
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| 161 | }else{ |
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| 162 | offset=ret; |
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| 163 | } |
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| 164 | } |
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| 165 | } |
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| 166 | |
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| 167 | /* we have the offset. Actually snork and hold the page now */ |
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| 168 | ret=_seek_helper(vf,offset); |
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| 169 | if(ret)return(ret); |
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| 170 | |
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| 171 | ret=_get_next_page(vf,og,CHUNKSIZE); |
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| 172 | if(ret<0) |
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| 173 | /* this shouldn't be possible */ |
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| 174 | return(OV_EFAULT); |
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| 175 | |
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| 176 | return(offset); |
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| 177 | } |
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| 178 | |
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| 179 | static void _add_serialno(ogg_page *og,long **serialno_list, int *n){ |
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| 180 | long s = ogg_page_serialno(og); |
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| 181 | (*n)++; |
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| 182 | |
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| 183 | if(serialno_list){ |
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| 184 | *serialno_list = _ogg_realloc(*serialno_list, sizeof(*serialno_list)*(*n)); |
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| 185 | }else{ |
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| 186 | *serialno_list = _ogg_malloc(sizeof(**serialno_list)); |
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| 187 | } |
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| 188 | |
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| 189 | (*serialno_list)[(*n)-1] = s; |
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| 190 | } |
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| 191 | |
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| 192 | /* returns nonzero if found */ |
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| 193 | static int _lookup_serialno(ogg_page *og, long *serialno_list, int n){ |
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| 194 | long s = ogg_page_serialno(og); |
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| 195 | |
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| 196 | if(serialno_list){ |
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| 197 | while(n--){ |
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| 198 | if(*serialno_list == s) return 1; |
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| 199 | serialno_list++; |
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| 200 | } |
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| 201 | } |
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| 202 | return 0; |
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| 203 | } |
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| 204 | |
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| 205 | /* start parsing pages at current offset, remembering all serial |
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| 206 | numbers. Stop logging at first non-bos page */ |
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| 207 | static int _get_serialnos(OggVorbis_File *vf, long **s, int *n){ |
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| 208 | ogg_page og; |
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| 209 | |
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| 210 | *s=NULL; |
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| 211 | *n=0; |
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| 212 | |
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| 213 | while(1){ |
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| 214 | ogg_int64_t llret=_get_next_page(vf,&og,CHUNKSIZE); |
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| 215 | if(llret==OV_EOF)return(0); |
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| 216 | if(llret<0)return(llret); |
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| 217 | if(!ogg_page_bos(&og)) return 0; |
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| 218 | |
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| 219 | /* look for duplicate serialnos; add this one if unique */ |
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| 220 | if(_lookup_serialno(&og,*s,*n)){ |
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| 221 | if(*s)_ogg_free(*s); |
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| 222 | *s=0; |
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| 223 | *n=0; |
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| 224 | return(OV_EBADHEADER); |
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| 225 | } |
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| 226 | |
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| 227 | _add_serialno(&og,s,n); |
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| 228 | } |
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| 229 | } |
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| 230 | |
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| 231 | /* finds each bitstream link one at a time using a bisection search |
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| 232 | (has to begin by knowing the offset of the lb's initial page). |
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| 233 | Recurses for each link so it can alloc the link storage after |
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| 234 | finding them all, then unroll and fill the cache at the same time */ |
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| 235 | static int _bisect_forward_serialno(OggVorbis_File *vf, |
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| 236 | ogg_int64_t begin, |
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| 237 | ogg_int64_t searched, |
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| 238 | ogg_int64_t end, |
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| 239 | long *currentno_list, |
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| 240 | int currentnos, |
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| 241 | long m){ |
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| 242 | ogg_int64_t endsearched=end; |
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| 243 | ogg_int64_t next=end; |
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| 244 | ogg_page og; |
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| 245 | ogg_int64_t ret; |
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| 246 | |
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| 247 | /* the below guards against garbage seperating the last and |
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| 248 | first pages of two links. */ |
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| 249 | while(searched<endsearched){ |
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| 250 | ogg_int64_t bisect; |
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| 251 | |
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| 252 | if(endsearched-searched<CHUNKSIZE){ |
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| 253 | bisect=searched; |
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| 254 | }else{ |
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| 255 | bisect=(searched+endsearched)/2; |
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| 256 | } |
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| 257 | |
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| 258 | ret=_seek_helper(vf,bisect); |
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| 259 | if(ret)return(ret); |
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| 260 | |
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| 261 | ret=_get_next_page(vf,&og,-1); |
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| 262 | if(ret==OV_EREAD)return(OV_EREAD); |
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| 263 | if(ret<0 || !_lookup_serialno(&og,currentno_list,currentnos)){ |
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| 264 | endsearched=bisect; |
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| 265 | if(ret>=0)next=ret; |
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| 266 | }else{ |
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| 267 | searched=ret+og.header_len+og.body_len; |
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| 268 | } |
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| 269 | } |
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| 270 | |
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| 271 | { |
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| 272 | long *next_serialno_list=NULL; |
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| 273 | int next_serialnos=0; |
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| 274 | |
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| 275 | ret=_seek_helper(vf,next); |
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| 276 | if(ret)return(ret); |
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| 277 | ret=_get_serialnos(vf,&next_serialno_list,&next_serialnos); |
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| 278 | if(ret)return(ret); |
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| 279 | |
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| 280 | if(searched>=end || next_serialnos==0){ |
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| 281 | vf->links=m+1; |
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| 282 | vf->offsets=_ogg_malloc((vf->links+1)*sizeof(*vf->offsets)); |
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| 283 | vf->offsets[m+1]=searched; |
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| 284 | }else{ |
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| 285 | ret=_bisect_forward_serialno(vf,next,vf->offset, |
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| 286 | end,next_serialno_list,next_serialnos,m+1); |
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| 287 | if(ret)return(ret); |
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| 288 | } |
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| 289 | |
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| 290 | if(next_serialno_list)_ogg_free(next_serialno_list); |
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| 291 | } |
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| 292 | vf->offsets[m]=begin; |
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| 293 | return(0); |
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| 294 | } |
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| 295 | |
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| 296 | /* uses the local ogg_stream storage in vf; this is important for |
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| 297 | non-streaming input sources */ |
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| 298 | static int _fetch_headers(OggVorbis_File *vf,vorbis_info *vi,vorbis_comment *vc, |
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| 299 | long *serialno,ogg_page *og_ptr){ |
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| 300 | ogg_page og; |
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| 301 | ogg_packet op; |
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| 302 | int i,ret; |
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| 303 | int allbos=0; |
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| 304 | |
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| 305 | if(!og_ptr){ |
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| 306 | ogg_int64_t llret=_get_next_page(vf,&og,CHUNKSIZE); |
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| 307 | if(llret==OV_EREAD)return(OV_EREAD); |
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| 308 | if(llret<0)return(OV_ENOTVORBIS); |
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| 309 | og_ptr=&og; |
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| 310 | } |
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| 311 | |
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| 312 | vorbis_info_init(vi); |
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| 313 | vorbis_comment_init(vc); |
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| 314 | |
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| 315 | /* extract the first set of vorbis headers we see in the headerset */ |
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| 316 | |
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| 317 | while(1){ |
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| 318 | |
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| 319 | /* if we're past the ID headers, we won't be finding a Vorbis |
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| 320 | stream in this link */ |
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| 321 | if(!ogg_page_bos(og_ptr)){ |
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| 322 | ret = OV_ENOTVORBIS; |
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| 323 | goto bail_header; |
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| 324 | } |
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| 325 | |
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| 326 | /* prospective stream setup; we need a stream to get packets */ |
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| 327 | ogg_stream_reset_serialno(&vf->os,ogg_page_serialno(og_ptr)); |
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| 328 | ogg_stream_pagein(&vf->os,og_ptr); |
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| 329 | |
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| 330 | if(ogg_stream_packetout(&vf->os,&op) > 0 && |
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| 331 | vorbis_synthesis_idheader(&op)){ |
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| 332 | |
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| 333 | /* continue Vorbis header load; past this point, any error will |
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| 334 | render this link useless (we won't continue looking for more |
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| 335 | Vorbis streams */ |
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| 336 | if(serialno)*serialno=vf->os.serialno; |
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| 337 | vf->ready_state=STREAMSET; |
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| 338 | if((ret=vorbis_synthesis_headerin(vi,vc,&op))) |
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| 339 | goto bail_header; |
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| 340 | |
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| 341 | i=0; |
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| 342 | while(i<2){ /* get a page loop */ |
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| 343 | |
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| 344 | while(i<2){ /* get a packet loop */ |
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| 345 | |
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| 346 | int result=ogg_stream_packetout(&vf->os,&op); |
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| 347 | if(result==0)break; |
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| 348 | if(result==-1){ |
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| 349 | ret=OV_EBADHEADER; |
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| 350 | goto bail_header; |
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| 351 | } |
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| 352 | |
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| 353 | if((ret=vorbis_synthesis_headerin(vi,vc,&op))) |
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| 354 | goto bail_header; |
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| 355 | |
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| 356 | i++; |
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| 357 | } |
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| 358 | |
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| 359 | while(i<2){ |
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| 360 | if(_get_next_page(vf,og_ptr,CHUNKSIZE)<0){ |
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| 361 | ret=OV_EBADHEADER; |
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| 362 | goto bail_header; |
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| 363 | } |
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| 364 | |
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| 365 | /* if this page belongs to the correct stream, go parse it */ |
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| 366 | if(vf->os.serialno == ogg_page_serialno(og_ptr)){ |
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| 367 | ogg_stream_pagein(&vf->os,og_ptr); |
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| 368 | break; |
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| 369 | } |
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| 370 | |
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| 371 | /* if we never see the final vorbis headers before the link |
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| 372 | ends, abort */ |
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| 373 | if(ogg_page_bos(og_ptr)){ |
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| 374 | if(allbos){ |
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| 375 | ret = OV_EBADHEADER; |
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| 376 | goto bail_header; |
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| 377 | }else |
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| 378 | allbos=1; |
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| 379 | } |
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| 380 | |
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| 381 | /* otherwise, keep looking */ |
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| 382 | } |
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| 383 | } |
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| 384 | |
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| 385 | return 0; |
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| 386 | } |
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| 387 | |
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| 388 | /* this wasn't vorbis, get next page, try again */ |
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| 389 | { |
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| 390 | ogg_int64_t llret=_get_next_page(vf,og_ptr,CHUNKSIZE); |
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| 391 | if(llret==OV_EREAD)return(OV_EREAD); |
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| 392 | if(llret<0)return(OV_ENOTVORBIS); |
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| 393 | } |
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| 394 | } |
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| 395 | |
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| 396 | bail_header: |
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| 397 | vorbis_info_clear(vi); |
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| 398 | vorbis_comment_clear(vc); |
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| 399 | vf->ready_state=OPENED; |
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| 400 | |
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| 401 | return ret; |
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| 402 | } |
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| 403 | |
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| 404 | /* last step of the OggVorbis_File initialization; get all the |
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| 405 | vorbis_info structs and PCM positions. Only called by the seekable |
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| 406 | initialization (local stream storage is hacked slightly; pay |
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| 407 | attention to how that's done) */ |
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| 408 | |
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| 409 | /* this is void and does not propogate errors up because we want to be |
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| 410 | able to open and use damaged bitstreams as well as we can. Just |
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| 411 | watch out for missing information for links in the OggVorbis_File |
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| 412 | struct */ |
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| 413 | static void _prefetch_all_headers(OggVorbis_File *vf, ogg_int64_t dataoffset){ |
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| 414 | ogg_page og; |
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| 415 | int i; |
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| 416 | ogg_int64_t ret; |
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| 417 | |
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| 418 | vf->vi=_ogg_realloc(vf->vi,vf->links*sizeof(*vf->vi)); |
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| 419 | vf->vc=_ogg_realloc(vf->vc,vf->links*sizeof(*vf->vc)); |
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| 420 | vf->serialnos=_ogg_malloc(vf->links*sizeof(*vf->serialnos)); |
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| 421 | vf->dataoffsets=_ogg_malloc(vf->links*sizeof(*vf->dataoffsets)); |
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| 422 | vf->pcmlengths=_ogg_malloc(vf->links*2*sizeof(*vf->pcmlengths)); |
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| 423 | |
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| 424 | for(i=0;i<vf->links;i++){ |
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| 425 | if(i==0){ |
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| 426 | /* we already grabbed the initial header earlier. Just set the offset */ |
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| 427 | vf->serialnos[i]=vf->current_serialno; |
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| 428 | vf->dataoffsets[i]=dataoffset; |
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| 429 | ret=_seek_helper(vf,dataoffset); |
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| 430 | if(ret) |
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| 431 | vf->dataoffsets[i]=-1; |
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| 432 | |
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| 433 | }else{ |
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| 434 | |
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| 435 | /* seek to the location of the initial header */ |
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| 436 | |
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| 437 | ret=_seek_helper(vf,vf->offsets[i]); |
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| 438 | if(ret){ |
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| 439 | vf->dataoffsets[i]=-1; |
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| 440 | }else{ |
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| 441 | if(_fetch_headers(vf,vf->vi+i,vf->vc+i,vf->serialnos+i,NULL)<0){ |
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| 442 | vf->dataoffsets[i]=-1; |
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| 443 | }else{ |
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| 444 | vf->dataoffsets[i]=vf->offset; |
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| 445 | } |
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| 446 | } |
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| 447 | } |
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| 448 | |
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| 449 | /* fetch beginning PCM offset */ |
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| 450 | |
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| 451 | if(vf->dataoffsets[i]!=-1){ |
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| 452 | ogg_int64_t accumulated=0; |
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| 453 | long lastblock=-1; |
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| 454 | int result; |
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| 455 | |
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| 456 | ogg_stream_reset_serialno(&vf->os,vf->serialnos[i]); |
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| 457 | |
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| 458 | while(1){ |
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| 459 | ogg_packet op; |
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| 460 | |
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| 461 | ret=_get_next_page(vf,&og,-1); |
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| 462 | if(ret<0) |
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| 463 | /* this should not be possible unless the file is |
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| 464 | truncated/mangled */ |
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| 465 | break; |
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| 466 | |
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| 467 | if(ogg_page_bos(&og)) break; |
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| 468 | |
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| 469 | if(ogg_page_serialno(&og)!=vf->serialnos[i]) |
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| 470 | continue; |
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| 471 | |
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| 472 | /* count blocksizes of all frames in the page */ |
---|
| 473 | ogg_stream_pagein(&vf->os,&og); |
---|
| 474 | while((result=ogg_stream_packetout(&vf->os,&op))){ |
---|
| 475 | if(result>0){ /* ignore holes */ |
---|
| 476 | long thisblock=vorbis_packet_blocksize(vf->vi+i,&op); |
---|
| 477 | if(lastblock!=-1) |
---|
| 478 | accumulated+=(lastblock+thisblock)>>2; |
---|
| 479 | lastblock=thisblock; |
---|
| 480 | } |
---|
| 481 | } |
---|
| 482 | |
---|
| 483 | if(ogg_page_granulepos(&og)!=-1){ |
---|
| 484 | /* pcm offset of last packet on the first audio page */ |
---|
| 485 | accumulated= ogg_page_granulepos(&og)-accumulated; |
---|
| 486 | break; |
---|
| 487 | } |
---|
| 488 | } |
---|
| 489 | |
---|
| 490 | /* less than zero? This is a stream with samples trimmed off |
---|
| 491 | the beginning, a normal occurrence; set the offset to zero */ |
---|
| 492 | if(accumulated<0)accumulated=0; |
---|
| 493 | |
---|
| 494 | vf->pcmlengths[i*2]=accumulated; |
---|
| 495 | } |
---|
| 496 | |
---|
| 497 | /* get the PCM length of this link. To do this, |
---|
| 498 | get the last page of the stream */ |
---|
| 499 | { |
---|
| 500 | ogg_int64_t end=vf->offsets[i+1]; |
---|
| 501 | ret=_seek_helper(vf,end); |
---|
| 502 | if(ret){ |
---|
| 503 | /* this should not be possible */ |
---|
| 504 | vorbis_info_clear(vf->vi+i); |
---|
| 505 | vorbis_comment_clear(vf->vc+i); |
---|
| 506 | }else{ |
---|
| 507 | |
---|
| 508 | while(1){ |
---|
| 509 | ret=_get_prev_page(vf,&og); |
---|
| 510 | if(ret<0){ |
---|
| 511 | /* this should not be possible */ |
---|
| 512 | vorbis_info_clear(vf->vi+i); |
---|
| 513 | vorbis_comment_clear(vf->vc+i); |
---|
| 514 | break; |
---|
| 515 | } |
---|
| 516 | if(ogg_page_serialno(&og)==vf->serialnos[i]){ |
---|
| 517 | if(ogg_page_granulepos(&og)!=-1){ |
---|
| 518 | vf->pcmlengths[i*2+1]=ogg_page_granulepos(&og)-vf->pcmlengths[i*2]; |
---|
| 519 | break; |
---|
| 520 | } |
---|
| 521 | } |
---|
| 522 | vf->offset=ret; |
---|
| 523 | } |
---|
| 524 | } |
---|
| 525 | } |
---|
| 526 | } |
---|
| 527 | } |
---|
| 528 | |
---|
| 529 | static int _make_decode_ready(OggVorbis_File *vf){ |
---|
| 530 | if(vf->ready_state>STREAMSET)return 0; |
---|
| 531 | if(vf->ready_state<STREAMSET)return OV_EFAULT; |
---|
| 532 | if(vf->seekable){ |
---|
| 533 | if(vorbis_synthesis_init(&vf->vd,vf->vi+vf->current_link)) |
---|
| 534 | return OV_EBADLINK; |
---|
| 535 | }else{ |
---|
| 536 | if(vorbis_synthesis_init(&vf->vd,vf->vi)) |
---|
| 537 | return OV_EBADLINK; |
---|
| 538 | } |
---|
| 539 | vorbis_block_init(&vf->vd,&vf->vb); |
---|
| 540 | vf->ready_state=INITSET; |
---|
| 541 | vf->bittrack=0.f; |
---|
| 542 | vf->samptrack=0.f; |
---|
| 543 | return 0; |
---|
| 544 | } |
---|
| 545 | |
---|
| 546 | static int _open_seekable2(OggVorbis_File *vf){ |
---|
| 547 | ogg_int64_t dataoffset=vf->offset,end; |
---|
| 548 | long *serialno_list=NULL; |
---|
| 549 | int serialnos=0; |
---|
| 550 | int ret; |
---|
| 551 | ogg_page og; |
---|
| 552 | |
---|
| 553 | /* we're partially open and have a first link header state in |
---|
| 554 | storage in vf */ |
---|
| 555 | /* we can seek, so set out learning all about this file */ |
---|
| 556 | if(vf->callbacks.seek_func && vf->callbacks.tell_func){ |
---|
| 557 | (vf->callbacks.seek_func)(vf->datasource,0,SEEK_END); |
---|
| 558 | vf->offset=vf->end=(vf->callbacks.tell_func)(vf->datasource); |
---|
| 559 | }else{ |
---|
| 560 | vf->offset=vf->end=-1; |
---|
| 561 | } |
---|
| 562 | |
---|
| 563 | /* If seek_func is implemented, tell_func must also be implemented */ |
---|
| 564 | if(vf->end==-1) return(OV_EINVAL); |
---|
| 565 | |
---|
| 566 | /* We get the offset for the last page of the physical bitstream. |
---|
| 567 | Most OggVorbis files will contain a single logical bitstream */ |
---|
| 568 | end=_get_prev_page(vf,&og); |
---|
| 569 | if(end<0)return(end); |
---|
| 570 | |
---|
| 571 | /* back to beginning, learn all serialnos of first link */ |
---|
| 572 | ret=_seek_helper(vf,0); |
---|
| 573 | if(ret)return(ret); |
---|
| 574 | ret=_get_serialnos(vf,&serialno_list,&serialnos); |
---|
| 575 | if(ret)return(ret); |
---|
| 576 | |
---|
| 577 | /* now determine bitstream structure recursively */ |
---|
| 578 | if(_bisect_forward_serialno(vf,0,0,end+1,serialno_list,serialnos,0)<0)return(OV_EREAD); |
---|
| 579 | if(serialno_list)_ogg_free(serialno_list); |
---|
| 580 | |
---|
| 581 | /* the initial header memory is referenced by vf after; don't free it */ |
---|
| 582 | _prefetch_all_headers(vf,dataoffset); |
---|
| 583 | return(ov_raw_seek(vf,0)); |
---|
| 584 | } |
---|
| 585 | |
---|
| 586 | /* clear out the current logical bitstream decoder */ |
---|
| 587 | static void _decode_clear(OggVorbis_File *vf){ |
---|
| 588 | vorbis_dsp_clear(&vf->vd); |
---|
| 589 | vorbis_block_clear(&vf->vb); |
---|
| 590 | vf->ready_state=OPENED; |
---|
| 591 | } |
---|
| 592 | |
---|
| 593 | /* fetch and process a packet. Handles the case where we're at a |
---|
| 594 | bitstream boundary and dumps the decoding machine. If the decoding |
---|
| 595 | machine is unloaded, it loads it. It also keeps pcm_offset up to |
---|
| 596 | date (seek and read both use this. seek uses a special hack with |
---|
| 597 | readp). |
---|
| 598 | |
---|
| 599 | return: <0) error, OV_HOLE (lost packet) or OV_EOF |
---|
| 600 | 0) need more data (only if readp==0) |
---|
| 601 | 1) got a packet |
---|
| 602 | */ |
---|
| 603 | |
---|
| 604 | static int _fetch_and_process_packet(OggVorbis_File *vf, |
---|
| 605 | ogg_packet *op_in, |
---|
| 606 | int readp, |
---|
| 607 | int spanp){ |
---|
| 608 | ogg_page og; |
---|
| 609 | |
---|
| 610 | /* handle one packet. Try to fetch it from current stream state */ |
---|
| 611 | /* extract packets from page */ |
---|
| 612 | while(1){ |
---|
| 613 | |
---|
| 614 | /* process a packet if we can. If the machine isn't loaded, |
---|
| 615 | neither is a page */ |
---|
| 616 | if(vf->ready_state==INITSET){ |
---|
| 617 | while(1) { |
---|
| 618 | ogg_packet op; |
---|
| 619 | ogg_packet *op_ptr=(op_in?op_in:&op); |
---|
| 620 | int result=ogg_stream_packetout(&vf->os,op_ptr); |
---|
| 621 | ogg_int64_t granulepos; |
---|
| 622 | |
---|
| 623 | op_in=NULL; |
---|
| 624 | if(result==-1)return(OV_HOLE); /* hole in the data. */ |
---|
| 625 | if(result>0){ |
---|
| 626 | /* got a packet. process it */ |
---|
| 627 | granulepos=op_ptr->granulepos; |
---|
| 628 | if(!vorbis_synthesis(&vf->vb,op_ptr)){ /* lazy check for lazy |
---|
| 629 | header handling. The |
---|
| 630 | header packets aren't |
---|
| 631 | audio, so if/when we |
---|
| 632 | submit them, |
---|
| 633 | vorbis_synthesis will |
---|
| 634 | reject them */ |
---|
| 635 | |
---|
| 636 | /* suck in the synthesis data and track bitrate */ |
---|
| 637 | { |
---|
| 638 | int oldsamples=vorbis_synthesis_pcmout(&vf->vd,NULL); |
---|
| 639 | /* for proper use of libvorbis within libvorbisfile, |
---|
| 640 | oldsamples will always be zero. */ |
---|
| 641 | if(oldsamples)return(OV_EFAULT); |
---|
| 642 | |
---|
| 643 | vorbis_synthesis_blockin(&vf->vd,&vf->vb); |
---|
| 644 | vf->samptrack+=vorbis_synthesis_pcmout(&vf->vd,NULL)-oldsamples; |
---|
| 645 | vf->bittrack+=op_ptr->bytes*8; |
---|
| 646 | } |
---|
| 647 | |
---|
| 648 | /* update the pcm offset. */ |
---|
| 649 | if(granulepos!=-1 && !op_ptr->e_o_s){ |
---|
| 650 | int link=(vf->seekable?vf->current_link:0); |
---|
| 651 | int i,samples; |
---|
| 652 | |
---|
| 653 | /* this packet has a pcm_offset on it (the last packet |
---|
| 654 | completed on a page carries the offset) After processing |
---|
| 655 | (above), we know the pcm position of the *last* sample |
---|
| 656 | ready to be returned. Find the offset of the *first* |
---|
| 657 | |
---|
| 658 | As an aside, this trick is inaccurate if we begin |
---|
| 659 | reading anew right at the last page; the end-of-stream |
---|
| 660 | granulepos declares the last frame in the stream, and the |
---|
| 661 | last packet of the last page may be a partial frame. |
---|
| 662 | So, we need a previous granulepos from an in-sequence page |
---|
| 663 | to have a reference point. Thus the !op_ptr->e_o_s clause |
---|
| 664 | above */ |
---|
| 665 | |
---|
| 666 | if(vf->seekable && link>0) |
---|
| 667 | granulepos-=vf->pcmlengths[link*2]; |
---|
| 668 | if(granulepos<0)granulepos=0; /* actually, this |
---|
| 669 | shouldn't be possible |
---|
| 670 | here unless the stream |
---|
| 671 | is very broken */ |
---|
| 672 | |
---|
| 673 | samples=vorbis_synthesis_pcmout(&vf->vd,NULL); |
---|
| 674 | |
---|
| 675 | granulepos-=samples; |
---|
| 676 | for(i=0;i<link;i++) |
---|
| 677 | granulepos+=vf->pcmlengths[i*2+1]; |
---|
| 678 | vf->pcm_offset=granulepos; |
---|
| 679 | } |
---|
| 680 | return(1); |
---|
| 681 | } |
---|
| 682 | } |
---|
| 683 | else |
---|
| 684 | break; |
---|
| 685 | } |
---|
| 686 | } |
---|
| 687 | |
---|
| 688 | if(vf->ready_state>=OPENED){ |
---|
| 689 | ogg_int64_t ret; |
---|
| 690 | |
---|
| 691 | while(1){ |
---|
| 692 | /* the loop is not strictly necessary, but there's no sense in |
---|
| 693 | doing the extra checks of the larger loop for the common |
---|
| 694 | case in a multiplexed bistream where the page is simply |
---|
| 695 | part of a different logical bitstream; keep reading until |
---|
| 696 | we get one with the correct serialno */ |
---|
| 697 | |
---|
| 698 | if(!readp)return(0); |
---|
| 699 | if((ret=_get_next_page(vf,&og,-1))<0){ |
---|
| 700 | return(OV_EOF); /* eof. leave unitialized */ |
---|
| 701 | } |
---|
| 702 | |
---|
| 703 | /* bitrate tracking; add the header's bytes here, the body bytes |
---|
| 704 | are done by packet above */ |
---|
| 705 | vf->bittrack+=og.header_len*8; |
---|
| 706 | |
---|
| 707 | if(vf->ready_state==INITSET){ |
---|
| 708 | if(vf->current_serialno!=ogg_page_serialno(&og)){ |
---|
| 709 | |
---|
| 710 | /* two possibilities: |
---|
| 711 | 1) our decoding just traversed a bitstream boundary |
---|
| 712 | 2) another stream is multiplexed into this logical section? */ |
---|
| 713 | |
---|
| 714 | if(ogg_page_bos(&og)){ |
---|
| 715 | /* boundary case */ |
---|
| 716 | if(!spanp) |
---|
| 717 | return(OV_EOF); |
---|
| 718 | |
---|
| 719 | _decode_clear(vf); |
---|
| 720 | |
---|
| 721 | if(!vf->seekable){ |
---|
| 722 | vorbis_info_clear(vf->vi); |
---|
| 723 | vorbis_comment_clear(vf->vc); |
---|
| 724 | } |
---|
| 725 | break; |
---|
| 726 | |
---|
| 727 | }else |
---|
| 728 | continue; /* possibility #2 */ |
---|
| 729 | } |
---|
| 730 | } |
---|
| 731 | |
---|
| 732 | break; |
---|
| 733 | } |
---|
| 734 | } |
---|
| 735 | |
---|
| 736 | /* Do we need to load a new machine before submitting the page? */ |
---|
| 737 | /* This is different in the seekable and non-seekable cases. |
---|
| 738 | |
---|
| 739 | In the seekable case, we already have all the header |
---|
| 740 | information loaded and cached; we just initialize the machine |
---|
| 741 | with it and continue on our merry way. |
---|
| 742 | |
---|
| 743 | In the non-seekable (streaming) case, we'll only be at a |
---|
| 744 | boundary if we just left the previous logical bitstream and |
---|
| 745 | we're now nominally at the header of the next bitstream |
---|
| 746 | */ |
---|
| 747 | |
---|
| 748 | if(vf->ready_state!=INITSET){ |
---|
| 749 | int link; |
---|
| 750 | |
---|
| 751 | if(vf->ready_state<STREAMSET){ |
---|
| 752 | if(vf->seekable){ |
---|
| 753 | long serialno = ogg_page_serialno(&og); |
---|
| 754 | |
---|
| 755 | /* match the serialno to bitstream section. We use this rather than |
---|
| 756 | offset positions to avoid problems near logical bitstream |
---|
| 757 | boundaries */ |
---|
| 758 | |
---|
| 759 | for(link=0;link<vf->links;link++) |
---|
| 760 | if(vf->serialnos[link]==serialno)break; |
---|
| 761 | |
---|
| 762 | if(link==vf->links) continue; /* not the desired Vorbis |
---|
| 763 | bitstream section; keep |
---|
| 764 | trying */ |
---|
| 765 | |
---|
| 766 | vf->current_serialno=serialno; |
---|
| 767 | vf->current_link=link; |
---|
| 768 | |
---|
| 769 | ogg_stream_reset_serialno(&vf->os,vf->current_serialno); |
---|
| 770 | vf->ready_state=STREAMSET; |
---|
| 771 | |
---|
| 772 | }else{ |
---|
| 773 | /* we're streaming */ |
---|
| 774 | /* fetch the three header packets, build the info struct */ |
---|
| 775 | |
---|
| 776 | int ret=_fetch_headers(vf,vf->vi,vf->vc,&vf->current_serialno,&og); |
---|
| 777 | if(ret)return(ret); |
---|
| 778 | vf->current_link++; |
---|
| 779 | link=0; |
---|
| 780 | } |
---|
| 781 | } |
---|
| 782 | |
---|
| 783 | { |
---|
| 784 | int ret=_make_decode_ready(vf); |
---|
| 785 | if(ret<0)return ret; |
---|
| 786 | } |
---|
| 787 | } |
---|
| 788 | |
---|
| 789 | /* the buffered page is the data we want, and we're ready for it; |
---|
| 790 | add it to the stream state */ |
---|
| 791 | ogg_stream_pagein(&vf->os,&og); |
---|
| 792 | |
---|
| 793 | } |
---|
| 794 | } |
---|
| 795 | |
---|
| 796 | /* if, eg, 64 bit stdio is configured by default, this will build with |
---|
| 797 | fseek64 */ |
---|
| 798 | static int _fseek64_wrap(FILE *f,ogg_int64_t off,int whence){ |
---|
| 799 | if(f==NULL)return(-1); |
---|
| 800 | return fseek(f,off,whence); |
---|
| 801 | } |
---|
| 802 | |
---|
| 803 | static int _ov_open1(void *f,OggVorbis_File *vf,char *initial, |
---|
| 804 | long ibytes, ov_callbacks callbacks){ |
---|
| 805 | int offsettest=((f && callbacks.seek_func)?callbacks.seek_func(f,0,SEEK_CUR):-1); |
---|
| 806 | int ret; |
---|
| 807 | |
---|
| 808 | memset(vf,0,sizeof(*vf)); |
---|
| 809 | vf->datasource=f; |
---|
| 810 | vf->callbacks = callbacks; |
---|
| 811 | |
---|
| 812 | /* init the framing state */ |
---|
| 813 | ogg_sync_init(&vf->oy); |
---|
| 814 | |
---|
| 815 | /* perhaps some data was previously read into a buffer for testing |
---|
| 816 | against other stream types. Allow initialization from this |
---|
| 817 | previously read data (as we may be reading from a non-seekable |
---|
| 818 | stream) */ |
---|
| 819 | if(initial){ |
---|
| 820 | char *buffer=ogg_sync_buffer(&vf->oy,ibytes); |
---|
| 821 | memcpy(buffer,initial,ibytes); |
---|
| 822 | ogg_sync_wrote(&vf->oy,ibytes); |
---|
| 823 | } |
---|
| 824 | |
---|
| 825 | /* can we seek? Stevens suggests the seek test was portable */ |
---|
| 826 | if(offsettest!=-1)vf->seekable=1; |
---|
| 827 | |
---|
| 828 | /* No seeking yet; Set up a 'single' (current) logical bitstream |
---|
| 829 | entry for partial open */ |
---|
| 830 | vf->links=1; |
---|
| 831 | vf->vi=_ogg_calloc(vf->links,sizeof(*vf->vi)); |
---|
| 832 | vf->vc=_ogg_calloc(vf->links,sizeof(*vf->vc)); |
---|
| 833 | ogg_stream_init(&vf->os,-1); /* fill in the serialno later */ |
---|
| 834 | |
---|
| 835 | /* Try to fetch the headers, maintaining all the storage */ |
---|
| 836 | if((ret=_fetch_headers(vf,vf->vi,vf->vc,&vf->current_serialno,NULL))<0){ |
---|
| 837 | vf->datasource=NULL; |
---|
| 838 | ov_clear(vf); |
---|
| 839 | }else |
---|
| 840 | vf->ready_state=PARTOPEN; |
---|
| 841 | return(ret); |
---|
| 842 | } |
---|
| 843 | |
---|
| 844 | static int _ov_open2(OggVorbis_File *vf){ |
---|
| 845 | if(vf->ready_state != PARTOPEN) return OV_EINVAL; |
---|
| 846 | vf->ready_state=OPENED; |
---|
| 847 | if(vf->seekable){ |
---|
| 848 | int ret=_open_seekable2(vf); |
---|
| 849 | if(ret){ |
---|
| 850 | vf->datasource=NULL; |
---|
| 851 | ov_clear(vf); |
---|
| 852 | } |
---|
| 853 | return(ret); |
---|
| 854 | }else |
---|
| 855 | vf->ready_state=STREAMSET; |
---|
| 856 | |
---|
| 857 | return 0; |
---|
| 858 | } |
---|
| 859 | |
---|
| 860 | |
---|
| 861 | /* clear out the OggVorbis_File struct */ |
---|
| 862 | int ov_clear(OggVorbis_File *vf){ |
---|
| 863 | if(vf){ |
---|
| 864 | vorbis_block_clear(&vf->vb); |
---|
| 865 | vorbis_dsp_clear(&vf->vd); |
---|
| 866 | ogg_stream_clear(&vf->os); |
---|
| 867 | |
---|
| 868 | if(vf->vi && vf->links){ |
---|
| 869 | int i; |
---|
| 870 | for(i=0;i<vf->links;i++){ |
---|
| 871 | vorbis_info_clear(vf->vi+i); |
---|
| 872 | vorbis_comment_clear(vf->vc+i); |
---|
| 873 | } |
---|
| 874 | _ogg_free(vf->vi); |
---|
| 875 | _ogg_free(vf->vc); |
---|
| 876 | } |
---|
| 877 | if(vf->dataoffsets)_ogg_free(vf->dataoffsets); |
---|
| 878 | if(vf->pcmlengths)_ogg_free(vf->pcmlengths); |
---|
| 879 | if(vf->serialnos)_ogg_free(vf->serialnos); |
---|
| 880 | if(vf->offsets)_ogg_free(vf->offsets); |
---|
| 881 | ogg_sync_clear(&vf->oy); |
---|
| 882 | if(vf->datasource && vf->callbacks.close_func) |
---|
| 883 | (vf->callbacks.close_func)(vf->datasource); |
---|
| 884 | memset(vf,0,sizeof(*vf)); |
---|
| 885 | } |
---|
| 886 | #ifdef DEBUG_LEAKS |
---|
| 887 | _VDBG_dump(); |
---|
| 888 | #endif |
---|
| 889 | return(0); |
---|
| 890 | } |
---|
| 891 | |
---|
| 892 | /* inspects the OggVorbis file and finds/documents all the logical |
---|
| 893 | bitstreams contained in it. Tries to be tolerant of logical |
---|
| 894 | bitstream sections that are truncated/woogie. |
---|
| 895 | |
---|
| 896 | return: -1) error |
---|
| 897 | 0) OK |
---|
| 898 | */ |
---|
| 899 | |
---|
| 900 | int ov_open_callbacks(void *f,OggVorbis_File *vf,char *initial,long ibytes, |
---|
| 901 | ov_callbacks callbacks){ |
---|
| 902 | int ret=_ov_open1(f,vf,initial,ibytes,callbacks); |
---|
| 903 | if(ret)return ret; |
---|
| 904 | return _ov_open2(vf); |
---|
| 905 | } |
---|
| 906 | |
---|
| 907 | int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes){ |
---|
| 908 | ov_callbacks callbacks = { |
---|
| 909 | (size_t (*)(void *, size_t, size_t, void *)) fread, |
---|
| 910 | (int (*)(void *, ogg_int64_t, int)) _fseek64_wrap, |
---|
| 911 | (int (*)(void *)) fclose, |
---|
| 912 | (long (*)(void *)) ftell |
---|
| 913 | }; |
---|
| 914 | |
---|
| 915 | return ov_open_callbacks((void *)f, vf, initial, ibytes, callbacks); |
---|
| 916 | } |
---|
| 917 | |
---|
| 918 | int ov_fopen(char *path,OggVorbis_File *vf){ |
---|
| 919 | int ret; |
---|
| 920 | FILE *f = fopen(path,"rb"); |
---|
| 921 | if(!f) return -1; |
---|
| 922 | |
---|
| 923 | ret = ov_open(f,vf,NULL,0); |
---|
| 924 | if(ret) fclose(f); |
---|
| 925 | return ret; |
---|
| 926 | } |
---|
| 927 | |
---|
| 928 | |
---|
| 929 | /* cheap hack for game usage where downsampling is desirable; there's |
---|
| 930 | no need for SRC as we can just do it cheaply in libvorbis. */ |
---|
| 931 | |
---|
| 932 | int ov_halfrate(OggVorbis_File *vf,int flag){ |
---|
| 933 | int i; |
---|
| 934 | if(vf->vi==NULL)return OV_EINVAL; |
---|
| 935 | if(!vf->seekable)return OV_EINVAL; |
---|
| 936 | if(vf->ready_state>=STREAMSET) |
---|
| 937 | _decode_clear(vf); /* clear out stream state; later on libvorbis |
---|
| 938 | will be able to swap this on the fly, but |
---|
| 939 | for now dumping the decode machine is needed |
---|
| 940 | to reinit the MDCT lookups. 1.1 libvorbis |
---|
| 941 | is planned to be able to switch on the fly */ |
---|
| 942 | |
---|
| 943 | for(i=0;i<vf->links;i++){ |
---|
| 944 | if(vorbis_synthesis_halfrate(vf->vi+i,flag)){ |
---|
| 945 | ov_halfrate(vf,0); |
---|
| 946 | return OV_EINVAL; |
---|
| 947 | } |
---|
| 948 | } |
---|
| 949 | return 0; |
---|
| 950 | } |
---|
| 951 | |
---|
| 952 | int ov_halfrate_p(OggVorbis_File *vf){ |
---|
| 953 | if(vf->vi==NULL)return OV_EINVAL; |
---|
| 954 | return vorbis_synthesis_halfrate_p(vf->vi); |
---|
| 955 | } |
---|
| 956 | |
---|
| 957 | /* Only partially open the vorbis file; test for Vorbisness, and load |
---|
| 958 | the headers for the first chain. Do not seek (although test for |
---|
| 959 | seekability). Use ov_test_open to finish opening the file, else |
---|
| 960 | ov_clear to close/free it. Same return codes as open. */ |
---|
| 961 | |
---|
| 962 | int ov_test_callbacks(void *f,OggVorbis_File *vf,char *initial,long ibytes, |
---|
| 963 | ov_callbacks callbacks) |
---|
| 964 | { |
---|
| 965 | return _ov_open1(f,vf,initial,ibytes,callbacks); |
---|
| 966 | } |
---|
| 967 | |
---|
| 968 | int ov_test(FILE *f,OggVorbis_File *vf,char *initial,long ibytes){ |
---|
| 969 | ov_callbacks callbacks = { |
---|
| 970 | (size_t (*)(void *, size_t, size_t, void *)) fread, |
---|
| 971 | (int (*)(void *, ogg_int64_t, int)) _fseek64_wrap, |
---|
| 972 | (int (*)(void *)) fclose, |
---|
| 973 | (long (*)(void *)) ftell |
---|
| 974 | }; |
---|
| 975 | |
---|
| 976 | return ov_test_callbacks((void *)f, vf, initial, ibytes, callbacks); |
---|
| 977 | } |
---|
| 978 | |
---|
| 979 | int ov_test_open(OggVorbis_File *vf){ |
---|
| 980 | if(vf->ready_state!=PARTOPEN)return(OV_EINVAL); |
---|
| 981 | return _ov_open2(vf); |
---|
| 982 | } |
---|
| 983 | |
---|
| 984 | /* How many logical bitstreams in this physical bitstream? */ |
---|
| 985 | long ov_streams(OggVorbis_File *vf){ |
---|
| 986 | return vf->links; |
---|
| 987 | } |
---|
| 988 | |
---|
| 989 | /* Is the FILE * associated with vf seekable? */ |
---|
| 990 | long ov_seekable(OggVorbis_File *vf){ |
---|
| 991 | return vf->seekable; |
---|
| 992 | } |
---|
| 993 | |
---|
| 994 | /* returns the bitrate for a given logical bitstream or the entire |
---|
| 995 | physical bitstream. If the file is open for random access, it will |
---|
| 996 | find the *actual* average bitrate. If the file is streaming, it |
---|
| 997 | returns the nominal bitrate (if set) else the average of the |
---|
| 998 | upper/lower bounds (if set) else -1 (unset). |
---|
| 999 | |
---|
| 1000 | If you want the actual bitrate field settings, get them from the |
---|
| 1001 | vorbis_info structs */ |
---|
| 1002 | |
---|
| 1003 | long ov_bitrate(OggVorbis_File *vf,int i){ |
---|
| 1004 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1005 | if(i>=vf->links)return(OV_EINVAL); |
---|
| 1006 | if(!vf->seekable && i!=0)return(ov_bitrate(vf,0)); |
---|
| 1007 | if(i<0){ |
---|
| 1008 | ogg_int64_t bits=0; |
---|
| 1009 | int i; |
---|
| 1010 | float br; |
---|
| 1011 | for(i=0;i<vf->links;i++) |
---|
| 1012 | bits+=(vf->offsets[i+1]-vf->dataoffsets[i])*8; |
---|
| 1013 | /* This once read: return(rint(bits/ov_time_total(vf,-1))); |
---|
| 1014 | * gcc 3.x on x86 miscompiled this at optimisation level 2 and above, |
---|
| 1015 | * so this is slightly transformed to make it work. |
---|
| 1016 | */ |
---|
| 1017 | br = bits/ov_time_total(vf,-1); |
---|
| 1018 | return(rint(br)); |
---|
| 1019 | }else{ |
---|
| 1020 | if(vf->seekable){ |
---|
| 1021 | /* return the actual bitrate */ |
---|
| 1022 | return(rint((vf->offsets[i+1]-vf->dataoffsets[i])*8/ov_time_total(vf,i))); |
---|
| 1023 | }else{ |
---|
| 1024 | /* return nominal if set */ |
---|
| 1025 | if(vf->vi[i].bitrate_nominal>0){ |
---|
| 1026 | return vf->vi[i].bitrate_nominal; |
---|
| 1027 | }else{ |
---|
| 1028 | if(vf->vi[i].bitrate_upper>0){ |
---|
| 1029 | if(vf->vi[i].bitrate_lower>0){ |
---|
| 1030 | return (vf->vi[i].bitrate_upper+vf->vi[i].bitrate_lower)/2; |
---|
| 1031 | }else{ |
---|
| 1032 | return vf->vi[i].bitrate_upper; |
---|
| 1033 | } |
---|
| 1034 | } |
---|
| 1035 | return(OV_FALSE); |
---|
| 1036 | } |
---|
| 1037 | } |
---|
| 1038 | } |
---|
| 1039 | } |
---|
| 1040 | |
---|
| 1041 | /* returns the actual bitrate since last call. returns -1 if no |
---|
| 1042 | additional data to offer since last call (or at beginning of stream), |
---|
| 1043 | EINVAL if stream is only partially open |
---|
| 1044 | */ |
---|
| 1045 | long ov_bitrate_instant(OggVorbis_File *vf){ |
---|
| 1046 | int link=(vf->seekable?vf->current_link:0); |
---|
| 1047 | long ret; |
---|
| 1048 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1049 | if(vf->samptrack==0)return(OV_FALSE); |
---|
| 1050 | ret=vf->bittrack/vf->samptrack*vf->vi[link].rate+.5; |
---|
| 1051 | vf->bittrack=0.f; |
---|
| 1052 | vf->samptrack=0.f; |
---|
| 1053 | return(ret); |
---|
| 1054 | } |
---|
| 1055 | |
---|
| 1056 | /* Guess */ |
---|
| 1057 | long ov_serialnumber(OggVorbis_File *vf,int i){ |
---|
| 1058 | if(i>=vf->links)return(ov_serialnumber(vf,vf->links-1)); |
---|
| 1059 | if(!vf->seekable && i>=0)return(ov_serialnumber(vf,-1)); |
---|
| 1060 | if(i<0){ |
---|
| 1061 | return(vf->current_serialno); |
---|
| 1062 | }else{ |
---|
| 1063 | return(vf->serialnos[i]); |
---|
| 1064 | } |
---|
| 1065 | } |
---|
| 1066 | |
---|
| 1067 | /* returns: total raw (compressed) length of content if i==-1 |
---|
| 1068 | raw (compressed) length of that logical bitstream for i==0 to n |
---|
| 1069 | OV_EINVAL if the stream is not seekable (we can't know the length) |
---|
| 1070 | or if stream is only partially open |
---|
| 1071 | */ |
---|
| 1072 | ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i){ |
---|
| 1073 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1074 | if(!vf->seekable || i>=vf->links)return(OV_EINVAL); |
---|
| 1075 | if(i<0){ |
---|
| 1076 | ogg_int64_t acc=0; |
---|
| 1077 | int i; |
---|
| 1078 | for(i=0;i<vf->links;i++) |
---|
| 1079 | acc+=ov_raw_total(vf,i); |
---|
| 1080 | return(acc); |
---|
| 1081 | }else{ |
---|
| 1082 | return(vf->offsets[i+1]-vf->offsets[i]); |
---|
| 1083 | } |
---|
| 1084 | } |
---|
| 1085 | |
---|
| 1086 | /* returns: total PCM length (samples) of content if i==-1 PCM length |
---|
| 1087 | (samples) of that logical bitstream for i==0 to n |
---|
| 1088 | OV_EINVAL if the stream is not seekable (we can't know the |
---|
| 1089 | length) or only partially open |
---|
| 1090 | */ |
---|
| 1091 | ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i){ |
---|
| 1092 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1093 | if(!vf->seekable || i>=vf->links)return(OV_EINVAL); |
---|
| 1094 | if(i<0){ |
---|
| 1095 | ogg_int64_t acc=0; |
---|
| 1096 | int i; |
---|
| 1097 | for(i=0;i<vf->links;i++) |
---|
| 1098 | acc+=ov_pcm_total(vf,i); |
---|
| 1099 | return(acc); |
---|
| 1100 | }else{ |
---|
| 1101 | return(vf->pcmlengths[i*2+1]); |
---|
| 1102 | } |
---|
| 1103 | } |
---|
| 1104 | |
---|
| 1105 | /* returns: total seconds of content if i==-1 |
---|
| 1106 | seconds in that logical bitstream for i==0 to n |
---|
| 1107 | OV_EINVAL if the stream is not seekable (we can't know the |
---|
| 1108 | length) or only partially open |
---|
| 1109 | */ |
---|
| 1110 | double ov_time_total(OggVorbis_File *vf,int i){ |
---|
| 1111 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1112 | if(!vf->seekable || i>=vf->links)return(OV_EINVAL); |
---|
| 1113 | if(i<0){ |
---|
| 1114 | double acc=0; |
---|
| 1115 | int i; |
---|
| 1116 | for(i=0;i<vf->links;i++) |
---|
| 1117 | acc+=ov_time_total(vf,i); |
---|
| 1118 | return(acc); |
---|
| 1119 | }else{ |
---|
| 1120 | return((double)(vf->pcmlengths[i*2+1])/vf->vi[i].rate); |
---|
| 1121 | } |
---|
| 1122 | } |
---|
| 1123 | |
---|
| 1124 | /* seek to an offset relative to the *compressed* data. This also |
---|
| 1125 | scans packets to update the PCM cursor. It will cross a logical |
---|
| 1126 | bitstream boundary, but only if it can't get any packets out of the |
---|
| 1127 | tail of the bitstream we seek to (so no surprises). |
---|
| 1128 | |
---|
| 1129 | returns zero on success, nonzero on failure */ |
---|
| 1130 | |
---|
| 1131 | int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos){ |
---|
| 1132 | ogg_stream_state work_os; |
---|
| 1133 | int ret; |
---|
| 1134 | |
---|
| 1135 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1136 | if(!vf->seekable) |
---|
| 1137 | return(OV_ENOSEEK); /* don't dump machine if we can't seek */ |
---|
| 1138 | |
---|
| 1139 | if(pos<0 || pos>vf->end)return(OV_EINVAL); |
---|
| 1140 | |
---|
| 1141 | /* don't yet clear out decoding machine (if it's initialized), in |
---|
| 1142 | the case we're in the same link. Restart the decode lapping, and |
---|
| 1143 | let _fetch_and_process_packet deal with a potential bitstream |
---|
| 1144 | boundary */ |
---|
| 1145 | vf->pcm_offset=-1; |
---|
| 1146 | ogg_stream_reset_serialno(&vf->os, |
---|
| 1147 | vf->current_serialno); /* must set serialno */ |
---|
| 1148 | vorbis_synthesis_restart(&vf->vd); |
---|
| 1149 | |
---|
| 1150 | ret=_seek_helper(vf,pos); |
---|
| 1151 | if(ret)goto seek_error; |
---|
| 1152 | |
---|
| 1153 | /* we need to make sure the pcm_offset is set, but we don't want to |
---|
| 1154 | advance the raw cursor past good packets just to get to the first |
---|
| 1155 | with a granulepos. That's not equivalent behavior to beginning |
---|
| 1156 | decoding as immediately after the seek position as possible. |
---|
| 1157 | |
---|
| 1158 | So, a hack. We use two stream states; a local scratch state and |
---|
| 1159 | the shared vf->os stream state. We use the local state to |
---|
| 1160 | scan, and the shared state as a buffer for later decode. |
---|
| 1161 | |
---|
| 1162 | Unfortuantely, on the last page we still advance to last packet |
---|
| 1163 | because the granulepos on the last page is not necessarily on a |
---|
| 1164 | packet boundary, and we need to make sure the granpos is |
---|
| 1165 | correct. |
---|
| 1166 | */ |
---|
| 1167 | |
---|
| 1168 | { |
---|
| 1169 | ogg_page og; |
---|
| 1170 | ogg_packet op; |
---|
| 1171 | int lastblock=0; |
---|
| 1172 | int accblock=0; |
---|
| 1173 | int thisblock=0; |
---|
| 1174 | int eosflag=0; |
---|
| 1175 | |
---|
| 1176 | ogg_stream_init(&work_os,vf->current_serialno); /* get the memory ready */ |
---|
| 1177 | ogg_stream_reset(&work_os); /* eliminate the spurious OV_HOLE |
---|
| 1178 | return from not necessarily |
---|
| 1179 | starting from the beginning */ |
---|
| 1180 | |
---|
| 1181 | while(1){ |
---|
| 1182 | if(vf->ready_state>=STREAMSET){ |
---|
| 1183 | /* snarf/scan a packet if we can */ |
---|
| 1184 | int result=ogg_stream_packetout(&work_os,&op); |
---|
| 1185 | |
---|
| 1186 | if(result>0){ |
---|
| 1187 | |
---|
| 1188 | if(vf->vi[vf->current_link].codec_setup){ |
---|
| 1189 | thisblock=vorbis_packet_blocksize(vf->vi+vf->current_link,&op); |
---|
| 1190 | if(thisblock<0){ |
---|
| 1191 | ogg_stream_packetout(&vf->os,NULL); |
---|
| 1192 | thisblock=0; |
---|
| 1193 | }else{ |
---|
| 1194 | |
---|
| 1195 | if(eosflag) |
---|
| 1196 | ogg_stream_packetout(&vf->os,NULL); |
---|
| 1197 | else |
---|
| 1198 | if(lastblock)accblock+=(lastblock+thisblock)>>2; |
---|
| 1199 | } |
---|
| 1200 | |
---|
| 1201 | if(op.granulepos!=-1){ |
---|
| 1202 | int i,link=vf->current_link; |
---|
| 1203 | ogg_int64_t granulepos=op.granulepos-vf->pcmlengths[link*2]; |
---|
| 1204 | if(granulepos<0)granulepos=0; |
---|
| 1205 | |
---|
| 1206 | for(i=0;i<link;i++) |
---|
| 1207 | granulepos+=vf->pcmlengths[i*2+1]; |
---|
| 1208 | vf->pcm_offset=granulepos-accblock; |
---|
| 1209 | break; |
---|
| 1210 | } |
---|
| 1211 | lastblock=thisblock; |
---|
| 1212 | continue; |
---|
| 1213 | }else |
---|
| 1214 | ogg_stream_packetout(&vf->os,NULL); |
---|
| 1215 | } |
---|
| 1216 | } |
---|
| 1217 | |
---|
| 1218 | if(!lastblock){ |
---|
| 1219 | if(_get_next_page(vf,&og,-1)<0){ |
---|
| 1220 | vf->pcm_offset=ov_pcm_total(vf,-1); |
---|
| 1221 | break; |
---|
| 1222 | } |
---|
| 1223 | }else{ |
---|
| 1224 | /* huh? Bogus stream with packets but no granulepos */ |
---|
| 1225 | vf->pcm_offset=-1; |
---|
| 1226 | break; |
---|
| 1227 | } |
---|
| 1228 | |
---|
| 1229 | /* has our decoding just traversed a bitstream boundary? */ |
---|
| 1230 | if(vf->ready_state>=STREAMSET){ |
---|
| 1231 | if(vf->current_serialno!=ogg_page_serialno(&og)){ |
---|
| 1232 | |
---|
| 1233 | /* two possibilities: |
---|
| 1234 | 1) our decoding just traversed a bitstream boundary |
---|
| 1235 | 2) another stream is multiplexed into this logical section? */ |
---|
| 1236 | |
---|
| 1237 | if(ogg_page_bos(&og)){ |
---|
| 1238 | /* we traversed */ |
---|
| 1239 | _decode_clear(vf); /* clear out stream state */ |
---|
| 1240 | ogg_stream_clear(&work_os); |
---|
| 1241 | } /* else, do nothing; next loop will scoop another page */ |
---|
| 1242 | } |
---|
| 1243 | } |
---|
| 1244 | |
---|
| 1245 | if(vf->ready_state<STREAMSET){ |
---|
| 1246 | int link; |
---|
| 1247 | long serialno = ogg_page_serialno(&og); |
---|
| 1248 | |
---|
| 1249 | for(link=0;link<vf->links;link++) |
---|
| 1250 | if(vf->serialnos[link]==serialno)break; |
---|
| 1251 | |
---|
| 1252 | if(link==vf->links) continue; /* not the desired Vorbis |
---|
| 1253 | bitstream section; keep |
---|
| 1254 | trying */ |
---|
| 1255 | vf->current_link=link; |
---|
| 1256 | vf->current_serialno=serialno; |
---|
| 1257 | ogg_stream_reset_serialno(&vf->os,serialno); |
---|
| 1258 | ogg_stream_reset_serialno(&work_os,serialno); |
---|
| 1259 | vf->ready_state=STREAMSET; |
---|
| 1260 | |
---|
| 1261 | } |
---|
| 1262 | |
---|
| 1263 | ogg_stream_pagein(&vf->os,&og); |
---|
| 1264 | ogg_stream_pagein(&work_os,&og); |
---|
| 1265 | eosflag=ogg_page_eos(&og); |
---|
| 1266 | } |
---|
| 1267 | } |
---|
| 1268 | |
---|
| 1269 | ogg_stream_clear(&work_os); |
---|
| 1270 | vf->bittrack=0.f; |
---|
| 1271 | vf->samptrack=0.f; |
---|
| 1272 | return(0); |
---|
| 1273 | |
---|
| 1274 | seek_error: |
---|
| 1275 | /* dump the machine so we're in a known state */ |
---|
| 1276 | vf->pcm_offset=-1; |
---|
| 1277 | ogg_stream_clear(&work_os); |
---|
| 1278 | _decode_clear(vf); |
---|
| 1279 | return OV_EBADLINK; |
---|
| 1280 | } |
---|
| 1281 | |
---|
| 1282 | /* Page granularity seek (faster than sample granularity because we |
---|
| 1283 | don't do the last bit of decode to find a specific sample). |
---|
| 1284 | |
---|
| 1285 | Seek to the last [granule marked] page preceeding the specified pos |
---|
| 1286 | location, such that decoding past the returned point will quickly |
---|
| 1287 | arrive at the requested position. */ |
---|
| 1288 | int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos){ |
---|
| 1289 | int link=-1; |
---|
| 1290 | ogg_int64_t result=0; |
---|
| 1291 | ogg_int64_t total=ov_pcm_total(vf,-1); |
---|
| 1292 | |
---|
| 1293 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1294 | if(!vf->seekable)return(OV_ENOSEEK); |
---|
| 1295 | |
---|
| 1296 | if(pos<0 || pos>total)return(OV_EINVAL); |
---|
| 1297 | |
---|
| 1298 | /* which bitstream section does this pcm offset occur in? */ |
---|
| 1299 | for(link=vf->links-1;link>=0;link--){ |
---|
| 1300 | total-=vf->pcmlengths[link*2+1]; |
---|
| 1301 | if(pos>=total)break; |
---|
| 1302 | } |
---|
| 1303 | |
---|
| 1304 | /* search within the logical bitstream for the page with the highest |
---|
| 1305 | pcm_pos preceeding (or equal to) pos. There is a danger here; |
---|
| 1306 | missing pages or incorrect frame number information in the |
---|
| 1307 | bitstream could make our task impossible. Account for that (it |
---|
| 1308 | would be an error condition) */ |
---|
| 1309 | |
---|
| 1310 | /* new search algorithm by HB (Nicholas Vinen) */ |
---|
| 1311 | { |
---|
| 1312 | ogg_int64_t end=vf->offsets[link+1]; |
---|
| 1313 | ogg_int64_t begin=vf->offsets[link]; |
---|
| 1314 | ogg_int64_t begintime = vf->pcmlengths[link*2]; |
---|
| 1315 | ogg_int64_t endtime = vf->pcmlengths[link*2+1]+begintime; |
---|
| 1316 | ogg_int64_t target=pos-total+begintime; |
---|
| 1317 | ogg_int64_t best=begin; |
---|
| 1318 | |
---|
| 1319 | ogg_page og; |
---|
| 1320 | while(begin<end){ |
---|
| 1321 | ogg_int64_t bisect; |
---|
| 1322 | |
---|
| 1323 | if(end-begin<CHUNKSIZE){ |
---|
| 1324 | bisect=begin; |
---|
| 1325 | }else{ |
---|
| 1326 | /* take a (pretty decent) guess. */ |
---|
| 1327 | bisect=begin + |
---|
| 1328 | (target-begintime)*(end-begin)/(endtime-begintime) - CHUNKSIZE; |
---|
| 1329 | if(bisect<=begin) |
---|
| 1330 | bisect=begin+1; |
---|
| 1331 | } |
---|
| 1332 | |
---|
| 1333 | result=_seek_helper(vf,bisect); |
---|
| 1334 | if(result) goto seek_error; |
---|
| 1335 | |
---|
| 1336 | while(begin<end){ |
---|
| 1337 | result=_get_next_page(vf,&og,end-vf->offset); |
---|
| 1338 | if(result==OV_EREAD) goto seek_error; |
---|
| 1339 | if(result<0){ |
---|
| 1340 | if(bisect<=begin+1) |
---|
| 1341 | end=begin; /* found it */ |
---|
| 1342 | else{ |
---|
| 1343 | if(bisect==0) goto seek_error; |
---|
| 1344 | bisect-=CHUNKSIZE; |
---|
| 1345 | if(bisect<=begin)bisect=begin+1; |
---|
| 1346 | result=_seek_helper(vf,bisect); |
---|
| 1347 | if(result) goto seek_error; |
---|
| 1348 | } |
---|
| 1349 | }else{ |
---|
| 1350 | ogg_int64_t granulepos; |
---|
| 1351 | |
---|
| 1352 | if(ogg_page_serialno(&og)!=vf->serialnos[link]) |
---|
| 1353 | continue; |
---|
| 1354 | |
---|
| 1355 | granulepos=ogg_page_granulepos(&og); |
---|
| 1356 | if(granulepos==-1)continue; |
---|
| 1357 | |
---|
| 1358 | if(granulepos<target){ |
---|
| 1359 | best=result; /* raw offset of packet with granulepos */ |
---|
| 1360 | begin=vf->offset; /* raw offset of next page */ |
---|
| 1361 | begintime=granulepos; |
---|
| 1362 | |
---|
| 1363 | if(target-begintime>44100)break; |
---|
| 1364 | bisect=begin; /* *not* begin + 1 */ |
---|
| 1365 | }else{ |
---|
| 1366 | if(bisect<=begin+1) |
---|
| 1367 | end=begin; /* found it */ |
---|
| 1368 | else{ |
---|
| 1369 | if(end==vf->offset){ /* we're pretty close - we'd be stuck in */ |
---|
| 1370 | end=result; |
---|
| 1371 | bisect-=CHUNKSIZE; /* an endless loop otherwise. */ |
---|
| 1372 | if(bisect<=begin)bisect=begin+1; |
---|
| 1373 | result=_seek_helper(vf,bisect); |
---|
| 1374 | if(result) goto seek_error; |
---|
| 1375 | }else{ |
---|
| 1376 | end=bisect; |
---|
| 1377 | endtime=granulepos; |
---|
| 1378 | break; |
---|
| 1379 | } |
---|
| 1380 | } |
---|
| 1381 | } |
---|
| 1382 | } |
---|
| 1383 | } |
---|
| 1384 | } |
---|
| 1385 | |
---|
| 1386 | /* found our page. seek to it, update pcm offset. Easier case than |
---|
| 1387 | raw_seek, don't keep packets preceeding granulepos. */ |
---|
| 1388 | { |
---|
| 1389 | ogg_page og; |
---|
| 1390 | ogg_packet op; |
---|
| 1391 | |
---|
| 1392 | /* seek */ |
---|
| 1393 | result=_seek_helper(vf,best); |
---|
| 1394 | vf->pcm_offset=-1; |
---|
| 1395 | if(result) goto seek_error; |
---|
| 1396 | result=_get_next_page(vf,&og,-1); |
---|
| 1397 | if(result<0) goto seek_error; |
---|
| 1398 | |
---|
| 1399 | if(link!=vf->current_link){ |
---|
| 1400 | /* Different link; dump entire decode machine */ |
---|
| 1401 | _decode_clear(vf); |
---|
| 1402 | |
---|
| 1403 | vf->current_link=link; |
---|
| 1404 | vf->current_serialno=vf->serialnos[link]; |
---|
| 1405 | vf->ready_state=STREAMSET; |
---|
| 1406 | |
---|
| 1407 | }else{ |
---|
| 1408 | vorbis_synthesis_restart(&vf->vd); |
---|
| 1409 | } |
---|
| 1410 | |
---|
| 1411 | ogg_stream_reset_serialno(&vf->os,vf->current_serialno); |
---|
| 1412 | ogg_stream_pagein(&vf->os,&og); |
---|
| 1413 | |
---|
| 1414 | /* pull out all but last packet; the one with granulepos */ |
---|
| 1415 | while(1){ |
---|
| 1416 | result=ogg_stream_packetpeek(&vf->os,&op); |
---|
| 1417 | if(result==0){ |
---|
| 1418 | /* !!! the packet finishing this page originated on a |
---|
| 1419 | preceeding page. Keep fetching previous pages until we |
---|
| 1420 | get one with a granulepos or without the 'continued' flag |
---|
| 1421 | set. Then just use raw_seek for simplicity. */ |
---|
| 1422 | |
---|
| 1423 | result=_seek_helper(vf,best); |
---|
| 1424 | if(result<0) goto seek_error; |
---|
| 1425 | |
---|
| 1426 | while(1){ |
---|
| 1427 | result=_get_prev_page(vf,&og); |
---|
| 1428 | if(result<0) goto seek_error; |
---|
| 1429 | if(ogg_page_serialno(&og)==vf->current_serialno && |
---|
| 1430 | (ogg_page_granulepos(&og)>-1 || |
---|
| 1431 | !ogg_page_continued(&og))){ |
---|
| 1432 | return ov_raw_seek(vf,result); |
---|
| 1433 | } |
---|
| 1434 | vf->offset=result; |
---|
| 1435 | } |
---|
| 1436 | } |
---|
| 1437 | if(result<0){ |
---|
| 1438 | result = OV_EBADPACKET; |
---|
| 1439 | goto seek_error; |
---|
| 1440 | } |
---|
| 1441 | if(op.granulepos!=-1){ |
---|
| 1442 | vf->pcm_offset=op.granulepos-vf->pcmlengths[vf->current_link*2]; |
---|
| 1443 | if(vf->pcm_offset<0)vf->pcm_offset=0; |
---|
| 1444 | vf->pcm_offset+=total; |
---|
| 1445 | break; |
---|
| 1446 | }else |
---|
| 1447 | result=ogg_stream_packetout(&vf->os,NULL); |
---|
| 1448 | } |
---|
| 1449 | } |
---|
| 1450 | } |
---|
| 1451 | |
---|
| 1452 | /* verify result */ |
---|
| 1453 | if(vf->pcm_offset>pos || pos>ov_pcm_total(vf,-1)){ |
---|
| 1454 | result=OV_EFAULT; |
---|
| 1455 | goto seek_error; |
---|
| 1456 | } |
---|
| 1457 | vf->bittrack=0.f; |
---|
| 1458 | vf->samptrack=0.f; |
---|
| 1459 | return(0); |
---|
| 1460 | |
---|
| 1461 | seek_error: |
---|
| 1462 | /* dump machine so we're in a known state */ |
---|
| 1463 | vf->pcm_offset=-1; |
---|
| 1464 | _decode_clear(vf); |
---|
| 1465 | return (int)result; |
---|
| 1466 | } |
---|
| 1467 | |
---|
| 1468 | /* seek to a sample offset relative to the decompressed pcm stream |
---|
| 1469 | returns zero on success, nonzero on failure */ |
---|
| 1470 | |
---|
| 1471 | int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos){ |
---|
| 1472 | int thisblock,lastblock=0; |
---|
| 1473 | int ret=ov_pcm_seek_page(vf,pos); |
---|
| 1474 | if(ret<0)return(ret); |
---|
| 1475 | if((ret=_make_decode_ready(vf)))return ret; |
---|
| 1476 | |
---|
| 1477 | /* discard leading packets we don't need for the lapping of the |
---|
| 1478 | position we want; don't decode them */ |
---|
| 1479 | |
---|
| 1480 | while(1){ |
---|
| 1481 | ogg_packet op; |
---|
| 1482 | ogg_page og; |
---|
| 1483 | |
---|
| 1484 | int ret=ogg_stream_packetpeek(&vf->os,&op); |
---|
| 1485 | if(ret>0){ |
---|
| 1486 | thisblock=vorbis_packet_blocksize(vf->vi+vf->current_link,&op); |
---|
| 1487 | if(thisblock<0){ |
---|
| 1488 | ogg_stream_packetout(&vf->os,NULL); |
---|
| 1489 | continue; /* non audio packet */ |
---|
| 1490 | } |
---|
| 1491 | if(lastblock)vf->pcm_offset+=(lastblock+thisblock)>>2; |
---|
| 1492 | |
---|
| 1493 | if(vf->pcm_offset+((thisblock+ |
---|
| 1494 | vorbis_info_blocksize(vf->vi,1))>>2)>=pos)break; |
---|
| 1495 | |
---|
| 1496 | /* remove the packet from packet queue and track its granulepos */ |
---|
| 1497 | ogg_stream_packetout(&vf->os,NULL); |
---|
| 1498 | vorbis_synthesis_trackonly(&vf->vb,&op); /* set up a vb with |
---|
| 1499 | only tracking, no |
---|
| 1500 | pcm_decode */ |
---|
| 1501 | vorbis_synthesis_blockin(&vf->vd,&vf->vb); |
---|
| 1502 | |
---|
| 1503 | /* end of logical stream case is hard, especially with exact |
---|
| 1504 | length positioning. */ |
---|
| 1505 | |
---|
| 1506 | if(op.granulepos>-1){ |
---|
| 1507 | int i; |
---|
| 1508 | /* always believe the stream markers */ |
---|
| 1509 | vf->pcm_offset=op.granulepos-vf->pcmlengths[vf->current_link*2]; |
---|
| 1510 | if(vf->pcm_offset<0)vf->pcm_offset=0; |
---|
| 1511 | for(i=0;i<vf->current_link;i++) |
---|
| 1512 | vf->pcm_offset+=vf->pcmlengths[i*2+1]; |
---|
| 1513 | } |
---|
| 1514 | |
---|
| 1515 | lastblock=thisblock; |
---|
| 1516 | |
---|
| 1517 | }else{ |
---|
| 1518 | if(ret<0 && ret!=OV_HOLE)break; |
---|
| 1519 | |
---|
| 1520 | /* suck in a new page */ |
---|
| 1521 | if(_get_next_page(vf,&og,-1)<0)break; |
---|
| 1522 | if(ogg_page_bos(&og))_decode_clear(vf); |
---|
| 1523 | |
---|
| 1524 | if(vf->ready_state<STREAMSET){ |
---|
| 1525 | long serialno=ogg_page_serialno(&og); |
---|
| 1526 | int link; |
---|
| 1527 | |
---|
| 1528 | for(link=0;link<vf->links;link++) |
---|
| 1529 | if(vf->serialnos[link]==serialno)break; |
---|
| 1530 | if(link==vf->links) continue; |
---|
| 1531 | vf->current_link=link; |
---|
| 1532 | |
---|
| 1533 | vf->ready_state=STREAMSET; |
---|
| 1534 | vf->current_serialno=ogg_page_serialno(&og); |
---|
| 1535 | ogg_stream_reset_serialno(&vf->os,serialno); |
---|
| 1536 | ret=_make_decode_ready(vf); |
---|
| 1537 | if(ret)return ret; |
---|
| 1538 | lastblock=0; |
---|
| 1539 | } |
---|
| 1540 | |
---|
| 1541 | ogg_stream_pagein(&vf->os,&og); |
---|
| 1542 | } |
---|
| 1543 | } |
---|
| 1544 | |
---|
| 1545 | vf->bittrack=0.f; |
---|
| 1546 | vf->samptrack=0.f; |
---|
| 1547 | /* discard samples until we reach the desired position. Crossing a |
---|
| 1548 | logical bitstream boundary with abandon is OK. */ |
---|
| 1549 | while(vf->pcm_offset<pos){ |
---|
| 1550 | ogg_int64_t target=pos-vf->pcm_offset; |
---|
| 1551 | long samples=vorbis_synthesis_pcmout(&vf->vd,NULL); |
---|
| 1552 | |
---|
| 1553 | if(samples>target)samples=target; |
---|
| 1554 | vorbis_synthesis_read(&vf->vd,samples); |
---|
| 1555 | vf->pcm_offset+=samples; |
---|
| 1556 | |
---|
| 1557 | if(samples<target) |
---|
| 1558 | if(_fetch_and_process_packet(vf,NULL,1,1)<=0) |
---|
| 1559 | vf->pcm_offset=ov_pcm_total(vf,-1); /* eof */ |
---|
| 1560 | } |
---|
| 1561 | return 0; |
---|
| 1562 | } |
---|
| 1563 | |
---|
| 1564 | /* seek to a playback time relative to the decompressed pcm stream |
---|
| 1565 | returns zero on success, nonzero on failure */ |
---|
| 1566 | int ov_time_seek(OggVorbis_File *vf,double seconds){ |
---|
| 1567 | /* translate time to PCM position and call ov_pcm_seek */ |
---|
| 1568 | |
---|
| 1569 | int link=-1; |
---|
| 1570 | ogg_int64_t pcm_total=0; |
---|
| 1571 | double time_total=0.; |
---|
| 1572 | |
---|
| 1573 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1574 | if(!vf->seekable)return(OV_ENOSEEK); |
---|
| 1575 | if(seconds<0)return(OV_EINVAL); |
---|
| 1576 | |
---|
| 1577 | /* which bitstream section does this time offset occur in? */ |
---|
| 1578 | for(link=0;link<vf->links;link++){ |
---|
| 1579 | double addsec = ov_time_total(vf,link); |
---|
| 1580 | if(seconds<time_total+addsec)break; |
---|
| 1581 | time_total+=addsec; |
---|
| 1582 | pcm_total+=vf->pcmlengths[link*2+1]; |
---|
| 1583 | } |
---|
| 1584 | |
---|
| 1585 | if(link==vf->links)return(OV_EINVAL); |
---|
| 1586 | |
---|
| 1587 | /* enough information to convert time offset to pcm offset */ |
---|
| 1588 | { |
---|
| 1589 | ogg_int64_t target=pcm_total+(seconds-time_total)*vf->vi[link].rate; |
---|
| 1590 | return(ov_pcm_seek(vf,target)); |
---|
| 1591 | } |
---|
| 1592 | } |
---|
| 1593 | |
---|
| 1594 | /* page-granularity version of ov_time_seek |
---|
| 1595 | returns zero on success, nonzero on failure */ |
---|
| 1596 | int ov_time_seek_page(OggVorbis_File *vf,double seconds){ |
---|
| 1597 | /* translate time to PCM position and call ov_pcm_seek */ |
---|
| 1598 | |
---|
| 1599 | int link=-1; |
---|
| 1600 | ogg_int64_t pcm_total=0; |
---|
| 1601 | double time_total=0.; |
---|
| 1602 | |
---|
| 1603 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1604 | if(!vf->seekable)return(OV_ENOSEEK); |
---|
| 1605 | if(seconds<0)return(OV_EINVAL); |
---|
| 1606 | |
---|
| 1607 | /* which bitstream section does this time offset occur in? */ |
---|
| 1608 | for(link=0;link<vf->links;link++){ |
---|
| 1609 | double addsec = ov_time_total(vf,link); |
---|
| 1610 | if(seconds<time_total+addsec)break; |
---|
| 1611 | time_total+=addsec; |
---|
| 1612 | pcm_total+=vf->pcmlengths[link*2+1]; |
---|
| 1613 | } |
---|
| 1614 | |
---|
| 1615 | if(link==vf->links)return(OV_EINVAL); |
---|
| 1616 | |
---|
| 1617 | /* enough information to convert time offset to pcm offset */ |
---|
| 1618 | { |
---|
| 1619 | ogg_int64_t target=pcm_total+(seconds-time_total)*vf->vi[link].rate; |
---|
| 1620 | return(ov_pcm_seek_page(vf,target)); |
---|
| 1621 | } |
---|
| 1622 | } |
---|
| 1623 | |
---|
| 1624 | /* tell the current stream offset cursor. Note that seek followed by |
---|
| 1625 | tell will likely not give the set offset due to caching */ |
---|
| 1626 | ogg_int64_t ov_raw_tell(OggVorbis_File *vf){ |
---|
| 1627 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1628 | return(vf->offset); |
---|
| 1629 | } |
---|
| 1630 | |
---|
| 1631 | /* return PCM offset (sample) of next PCM sample to be read */ |
---|
| 1632 | ogg_int64_t ov_pcm_tell(OggVorbis_File *vf){ |
---|
| 1633 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1634 | return(vf->pcm_offset); |
---|
| 1635 | } |
---|
| 1636 | |
---|
| 1637 | /* return time offset (seconds) of next PCM sample to be read */ |
---|
| 1638 | double ov_time_tell(OggVorbis_File *vf){ |
---|
| 1639 | int link=0; |
---|
| 1640 | ogg_int64_t pcm_total=0; |
---|
| 1641 | double time_total=0.f; |
---|
| 1642 | |
---|
| 1643 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1644 | if(vf->seekable){ |
---|
| 1645 | pcm_total=ov_pcm_total(vf,-1); |
---|
| 1646 | time_total=ov_time_total(vf,-1); |
---|
| 1647 | |
---|
| 1648 | /* which bitstream section does this time offset occur in? */ |
---|
| 1649 | for(link=vf->links-1;link>=0;link--){ |
---|
| 1650 | pcm_total-=vf->pcmlengths[link*2+1]; |
---|
| 1651 | time_total-=ov_time_total(vf,link); |
---|
| 1652 | if(vf->pcm_offset>=pcm_total)break; |
---|
| 1653 | } |
---|
| 1654 | } |
---|
| 1655 | |
---|
| 1656 | return((double)time_total+(double)(vf->pcm_offset-pcm_total)/vf->vi[link].rate); |
---|
| 1657 | } |
---|
| 1658 | |
---|
| 1659 | /* link: -1) return the vorbis_info struct for the bitstream section |
---|
| 1660 | currently being decoded |
---|
| 1661 | 0-n) to request information for a specific bitstream section |
---|
| 1662 | |
---|
| 1663 | In the case of a non-seekable bitstream, any call returns the |
---|
| 1664 | current bitstream. NULL in the case that the machine is not |
---|
| 1665 | initialized */ |
---|
| 1666 | |
---|
| 1667 | vorbis_info *ov_info(OggVorbis_File *vf,int link){ |
---|
| 1668 | if(vf->seekable){ |
---|
| 1669 | if(link<0) |
---|
| 1670 | if(vf->ready_state>=STREAMSET) |
---|
| 1671 | return vf->vi+vf->current_link; |
---|
| 1672 | else |
---|
| 1673 | return vf->vi; |
---|
| 1674 | else |
---|
| 1675 | if(link>=vf->links) |
---|
| 1676 | return NULL; |
---|
| 1677 | else |
---|
| 1678 | return vf->vi+link; |
---|
| 1679 | }else{ |
---|
| 1680 | return vf->vi; |
---|
| 1681 | } |
---|
| 1682 | } |
---|
| 1683 | |
---|
| 1684 | /* grr, strong typing, grr, no templates/inheritence, grr */ |
---|
| 1685 | vorbis_comment *ov_comment(OggVorbis_File *vf,int link){ |
---|
| 1686 | if(vf->seekable){ |
---|
| 1687 | if(link<0) |
---|
| 1688 | if(vf->ready_state>=STREAMSET) |
---|
| 1689 | return vf->vc+vf->current_link; |
---|
| 1690 | else |
---|
| 1691 | return vf->vc; |
---|
| 1692 | else |
---|
| 1693 | if(link>=vf->links) |
---|
| 1694 | return NULL; |
---|
| 1695 | else |
---|
| 1696 | return vf->vc+link; |
---|
| 1697 | }else{ |
---|
| 1698 | return vf->vc; |
---|
| 1699 | } |
---|
| 1700 | } |
---|
| 1701 | |
---|
| 1702 | static int host_is_big_endian() { |
---|
| 1703 | ogg_int32_t pattern = 0xfeedface; /* deadbeef */ |
---|
| 1704 | unsigned char *bytewise = (unsigned char *)&pattern; |
---|
| 1705 | if (bytewise[0] == 0xfe) return 1; |
---|
| 1706 | return 0; |
---|
| 1707 | } |
---|
| 1708 | |
---|
| 1709 | /* up to this point, everything could more or less hide the multiple |
---|
| 1710 | logical bitstream nature of chaining from the toplevel application |
---|
| 1711 | if the toplevel application didn't particularly care. However, at |
---|
| 1712 | the point that we actually read audio back, the multiple-section |
---|
| 1713 | nature must surface: Multiple bitstream sections do not necessarily |
---|
| 1714 | have to have the same number of channels or sampling rate. |
---|
| 1715 | |
---|
| 1716 | ov_read returns the sequential logical bitstream number currently |
---|
| 1717 | being decoded along with the PCM data in order that the toplevel |
---|
| 1718 | application can take action on channel/sample rate changes. This |
---|
| 1719 | number will be incremented even for streamed (non-seekable) streams |
---|
| 1720 | (for seekable streams, it represents the actual logical bitstream |
---|
| 1721 | index within the physical bitstream. Note that the accessor |
---|
| 1722 | functions above are aware of this dichotomy). |
---|
| 1723 | |
---|
| 1724 | input values: buffer) a buffer to hold packed PCM data for return |
---|
| 1725 | length) the byte length requested to be placed into buffer |
---|
| 1726 | bigendianp) should the data be packed LSB first (0) or |
---|
| 1727 | MSB first (1) |
---|
| 1728 | word) word size for output. currently 1 (byte) or |
---|
| 1729 | 2 (16 bit short) |
---|
| 1730 | |
---|
| 1731 | return values: <0) error/hole in data (OV_HOLE), partial open (OV_EINVAL) |
---|
| 1732 | 0) EOF |
---|
| 1733 | n) number of bytes of PCM actually returned. The |
---|
| 1734 | below works on a packet-by-packet basis, so the |
---|
| 1735 | return length is not related to the 'length' passed |
---|
| 1736 | in, just guaranteed to fit. |
---|
| 1737 | |
---|
| 1738 | *section) set to the logical bitstream number */ |
---|
| 1739 | |
---|
| 1740 | long ov_read(OggVorbis_File *vf,char *buffer,int length, |
---|
| 1741 | int bigendianp,int word,int sgned,int *bitstream){ |
---|
| 1742 | int i,j; |
---|
| 1743 | int host_endian = host_is_big_endian(); |
---|
| 1744 | |
---|
| 1745 | float **pcm; |
---|
| 1746 | long samples; |
---|
| 1747 | |
---|
| 1748 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1749 | |
---|
| 1750 | while(1){ |
---|
| 1751 | if(vf->ready_state==INITSET){ |
---|
| 1752 | samples=vorbis_synthesis_pcmout(&vf->vd,&pcm); |
---|
| 1753 | if(samples)break; |
---|
| 1754 | } |
---|
| 1755 | |
---|
| 1756 | /* suck in another packet */ |
---|
| 1757 | { |
---|
| 1758 | int ret=_fetch_and_process_packet(vf,NULL,1,1); |
---|
| 1759 | if(ret==OV_EOF) |
---|
| 1760 | return(0); |
---|
| 1761 | if(ret<=0) |
---|
| 1762 | return(ret); |
---|
| 1763 | } |
---|
| 1764 | |
---|
| 1765 | } |
---|
| 1766 | |
---|
| 1767 | if(samples>0){ |
---|
| 1768 | |
---|
| 1769 | /* yay! proceed to pack data into the byte buffer */ |
---|
| 1770 | |
---|
| 1771 | long channels=ov_info(vf,-1)->channels; |
---|
| 1772 | long bytespersample=word * channels; |
---|
| 1773 | vorbis_fpu_control fpu; |
---|
| 1774 | if(samples>length/bytespersample)samples=length/bytespersample; |
---|
| 1775 | |
---|
| 1776 | if(samples <= 0) |
---|
| 1777 | return OV_EINVAL; |
---|
| 1778 | |
---|
| 1779 | /* a tight loop to pack each size */ |
---|
| 1780 | { |
---|
| 1781 | int val; |
---|
| 1782 | if(word==1){ |
---|
| 1783 | int off=(sgned?0:128); |
---|
| 1784 | vorbis_fpu_setround(&fpu); |
---|
| 1785 | for(j=0;j<samples;j++) |
---|
| 1786 | for(i=0;i<channels;i++){ |
---|
| 1787 | val=vorbis_ftoi(pcm[i][j]*128.f); |
---|
| 1788 | if(val>127)val=127; |
---|
| 1789 | else if(val<-128)val=-128; |
---|
| 1790 | *buffer++=val+off; |
---|
| 1791 | } |
---|
| 1792 | vorbis_fpu_restore(fpu); |
---|
| 1793 | }else{ |
---|
| 1794 | int off=(sgned?0:32768); |
---|
| 1795 | |
---|
| 1796 | if(host_endian==bigendianp){ |
---|
| 1797 | if(sgned){ |
---|
| 1798 | |
---|
| 1799 | vorbis_fpu_setround(&fpu); |
---|
| 1800 | for(i=0;i<channels;i++) { /* It's faster in this order */ |
---|
| 1801 | float *src=pcm[i]; |
---|
| 1802 | short *dest=((short *)buffer)+i; |
---|
| 1803 | for(j=0;j<samples;j++) { |
---|
| 1804 | val=vorbis_ftoi(src[j]*32768.f); |
---|
| 1805 | if(val>32767)val=32767; |
---|
| 1806 | else if(val<-32768)val=-32768; |
---|
| 1807 | *dest=val; |
---|
| 1808 | dest+=channels; |
---|
| 1809 | } |
---|
| 1810 | } |
---|
| 1811 | vorbis_fpu_restore(fpu); |
---|
| 1812 | |
---|
| 1813 | }else{ |
---|
| 1814 | |
---|
| 1815 | vorbis_fpu_setround(&fpu); |
---|
| 1816 | for(i=0;i<channels;i++) { |
---|
| 1817 | float *src=pcm[i]; |
---|
| 1818 | short *dest=((short *)buffer)+i; |
---|
| 1819 | for(j=0;j<samples;j++) { |
---|
| 1820 | val=vorbis_ftoi(src[j]*32768.f); |
---|
| 1821 | if(val>32767)val=32767; |
---|
| 1822 | else if(val<-32768)val=-32768; |
---|
| 1823 | *dest=val+off; |
---|
| 1824 | dest+=channels; |
---|
| 1825 | } |
---|
| 1826 | } |
---|
| 1827 | vorbis_fpu_restore(fpu); |
---|
| 1828 | |
---|
| 1829 | } |
---|
| 1830 | }else if(bigendianp){ |
---|
| 1831 | |
---|
| 1832 | vorbis_fpu_setround(&fpu); |
---|
| 1833 | for(j=0;j<samples;j++) |
---|
| 1834 | for(i=0;i<channels;i++){ |
---|
| 1835 | val=vorbis_ftoi(pcm[i][j]*32768.f); |
---|
| 1836 | if(val>32767)val=32767; |
---|
| 1837 | else if(val<-32768)val=-32768; |
---|
| 1838 | val+=off; |
---|
| 1839 | *buffer++=(val>>8); |
---|
| 1840 | *buffer++=(val&0xff); |
---|
| 1841 | } |
---|
| 1842 | vorbis_fpu_restore(fpu); |
---|
| 1843 | |
---|
| 1844 | }else{ |
---|
| 1845 | int val; |
---|
| 1846 | vorbis_fpu_setround(&fpu); |
---|
| 1847 | for(j=0;j<samples;j++) |
---|
| 1848 | for(i=0;i<channels;i++){ |
---|
| 1849 | val=vorbis_ftoi(pcm[i][j]*32768.f); |
---|
| 1850 | if(val>32767)val=32767; |
---|
| 1851 | else if(val<-32768)val=-32768; |
---|
| 1852 | val+=off; |
---|
| 1853 | *buffer++=(val&0xff); |
---|
| 1854 | *buffer++=(val>>8); |
---|
| 1855 | } |
---|
| 1856 | vorbis_fpu_restore(fpu); |
---|
| 1857 | |
---|
| 1858 | } |
---|
| 1859 | } |
---|
| 1860 | } |
---|
| 1861 | |
---|
| 1862 | vorbis_synthesis_read(&vf->vd,samples); |
---|
| 1863 | vf->pcm_offset+=samples; |
---|
| 1864 | if(bitstream)*bitstream=vf->current_link; |
---|
| 1865 | return(samples*bytespersample); |
---|
| 1866 | }else{ |
---|
| 1867 | return(samples); |
---|
| 1868 | } |
---|
| 1869 | } |
---|
| 1870 | |
---|
| 1871 | /* input values: pcm_channels) a float vector per channel of output |
---|
| 1872 | length) the sample length being read by the app |
---|
| 1873 | |
---|
| 1874 | return values: <0) error/hole in data (OV_HOLE), partial open (OV_EINVAL) |
---|
| 1875 | 0) EOF |
---|
| 1876 | n) number of samples of PCM actually returned. The |
---|
| 1877 | below works on a packet-by-packet basis, so the |
---|
| 1878 | return length is not related to the 'length' passed |
---|
| 1879 | in, just guaranteed to fit. |
---|
| 1880 | |
---|
| 1881 | *section) set to the logical bitstream number */ |
---|
| 1882 | |
---|
| 1883 | |
---|
| 1884 | |
---|
| 1885 | long ov_read_float(OggVorbis_File *vf,float ***pcm_channels,int length, |
---|
| 1886 | int *bitstream){ |
---|
| 1887 | |
---|
| 1888 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 1889 | |
---|
| 1890 | while(1){ |
---|
| 1891 | if(vf->ready_state==INITSET){ |
---|
| 1892 | float **pcm; |
---|
| 1893 | long samples=vorbis_synthesis_pcmout(&vf->vd,&pcm); |
---|
| 1894 | if(samples){ |
---|
| 1895 | if(pcm_channels)*pcm_channels=pcm; |
---|
| 1896 | if(samples>length)samples=length; |
---|
| 1897 | vorbis_synthesis_read(&vf->vd,samples); |
---|
| 1898 | vf->pcm_offset+=samples; |
---|
| 1899 | if(bitstream)*bitstream=vf->current_link; |
---|
| 1900 | return samples; |
---|
| 1901 | |
---|
| 1902 | } |
---|
| 1903 | } |
---|
| 1904 | |
---|
| 1905 | /* suck in another packet */ |
---|
| 1906 | { |
---|
| 1907 | int ret=_fetch_and_process_packet(vf,NULL,1,1); |
---|
| 1908 | if(ret==OV_EOF)return(0); |
---|
| 1909 | if(ret<=0)return(ret); |
---|
| 1910 | } |
---|
| 1911 | |
---|
| 1912 | } |
---|
| 1913 | } |
---|
| 1914 | |
---|
| 1915 | extern float *vorbis_window(vorbis_dsp_state *v,int W); |
---|
| 1916 | extern void _analysis_output_always(char *base,int i,float *v,int n,int bark,int dB, |
---|
| 1917 | ogg_int64_t off); |
---|
| 1918 | |
---|
| 1919 | static void _ov_splice(float **pcm,float **lappcm, |
---|
| 1920 | int n1, int n2, |
---|
| 1921 | int ch1, int ch2, |
---|
| 1922 | float *w1, float *w2){ |
---|
| 1923 | int i,j; |
---|
| 1924 | float *w=w1; |
---|
| 1925 | int n=n1; |
---|
| 1926 | |
---|
| 1927 | if(n1>n2){ |
---|
| 1928 | n=n2; |
---|
| 1929 | w=w2; |
---|
| 1930 | } |
---|
| 1931 | |
---|
| 1932 | /* splice */ |
---|
| 1933 | for(j=0;j<ch1 && j<ch2;j++){ |
---|
| 1934 | float *s=lappcm[j]; |
---|
| 1935 | float *d=pcm[j]; |
---|
| 1936 | |
---|
| 1937 | for(i=0;i<n;i++){ |
---|
| 1938 | float wd=w[i]*w[i]; |
---|
| 1939 | float ws=1.-wd; |
---|
| 1940 | d[i]=d[i]*wd + s[i]*ws; |
---|
| 1941 | } |
---|
| 1942 | } |
---|
| 1943 | /* window from zero */ |
---|
| 1944 | for(;j<ch2;j++){ |
---|
| 1945 | float *d=pcm[j]; |
---|
| 1946 | for(i=0;i<n;i++){ |
---|
| 1947 | float wd=w[i]*w[i]; |
---|
| 1948 | d[i]=d[i]*wd; |
---|
| 1949 | } |
---|
| 1950 | } |
---|
| 1951 | |
---|
| 1952 | } |
---|
| 1953 | |
---|
| 1954 | /* make sure vf is INITSET */ |
---|
| 1955 | static int _ov_initset(OggVorbis_File *vf){ |
---|
| 1956 | while(1){ |
---|
| 1957 | if(vf->ready_state==INITSET)break; |
---|
| 1958 | /* suck in another packet */ |
---|
| 1959 | { |
---|
| 1960 | int ret=_fetch_and_process_packet(vf,NULL,1,0); |
---|
| 1961 | if(ret<0 && ret!=OV_HOLE)return(ret); |
---|
| 1962 | } |
---|
| 1963 | } |
---|
| 1964 | return 0; |
---|
| 1965 | } |
---|
| 1966 | |
---|
| 1967 | /* make sure vf is INITSET and that we have a primed buffer; if |
---|
| 1968 | we're crosslapping at a stream section boundary, this also makes |
---|
| 1969 | sure we're sanity checking against the right stream information */ |
---|
| 1970 | static int _ov_initprime(OggVorbis_File *vf){ |
---|
| 1971 | vorbis_dsp_state *vd=&vf->vd; |
---|
| 1972 | while(1){ |
---|
| 1973 | if(vf->ready_state==INITSET) |
---|
| 1974 | if(vorbis_synthesis_pcmout(vd,NULL))break; |
---|
| 1975 | |
---|
| 1976 | /* suck in another packet */ |
---|
| 1977 | { |
---|
| 1978 | int ret=_fetch_and_process_packet(vf,NULL,1,0); |
---|
| 1979 | if(ret<0 && ret!=OV_HOLE)return(ret); |
---|
| 1980 | } |
---|
| 1981 | } |
---|
| 1982 | return 0; |
---|
| 1983 | } |
---|
| 1984 | |
---|
| 1985 | /* grab enough data for lapping from vf; this may be in the form of |
---|
| 1986 | unreturned, already-decoded pcm, remaining PCM we will need to |
---|
| 1987 | decode, or synthetic postextrapolation from last packets. */ |
---|
| 1988 | static void _ov_getlap(OggVorbis_File *vf,vorbis_info *vi,vorbis_dsp_state *vd, |
---|
| 1989 | float **lappcm,int lapsize){ |
---|
| 1990 | int lapcount=0,i; |
---|
| 1991 | float **pcm; |
---|
| 1992 | |
---|
| 1993 | /* try first to decode the lapping data */ |
---|
| 1994 | while(lapcount<lapsize){ |
---|
| 1995 | int samples=vorbis_synthesis_pcmout(vd,&pcm); |
---|
| 1996 | if(samples){ |
---|
| 1997 | if(samples>lapsize-lapcount)samples=lapsize-lapcount; |
---|
| 1998 | for(i=0;i<vi->channels;i++) |
---|
| 1999 | memcpy(lappcm[i]+lapcount,pcm[i],sizeof(**pcm)*samples); |
---|
| 2000 | lapcount+=samples; |
---|
| 2001 | vorbis_synthesis_read(vd,samples); |
---|
| 2002 | }else{ |
---|
| 2003 | /* suck in another packet */ |
---|
| 2004 | int ret=_fetch_and_process_packet(vf,NULL,1,0); /* do *not* span */ |
---|
| 2005 | if(ret==OV_EOF)break; |
---|
| 2006 | } |
---|
| 2007 | } |
---|
| 2008 | if(lapcount<lapsize){ |
---|
| 2009 | /* failed to get lapping data from normal decode; pry it from the |
---|
| 2010 | postextrapolation buffering, or the second half of the MDCT |
---|
| 2011 | from the last packet */ |
---|
| 2012 | int samples=vorbis_synthesis_lapout(&vf->vd,&pcm); |
---|
| 2013 | if(samples==0){ |
---|
| 2014 | for(i=0;i<vi->channels;i++) |
---|
| 2015 | memset(lappcm[i]+lapcount,0,sizeof(**pcm)*lapsize-lapcount); |
---|
| 2016 | lapcount=lapsize; |
---|
| 2017 | }else{ |
---|
| 2018 | if(samples>lapsize-lapcount)samples=lapsize-lapcount; |
---|
| 2019 | for(i=0;i<vi->channels;i++) |
---|
| 2020 | memcpy(lappcm[i]+lapcount,pcm[i],sizeof(**pcm)*samples); |
---|
| 2021 | lapcount+=samples; |
---|
| 2022 | } |
---|
| 2023 | } |
---|
| 2024 | } |
---|
| 2025 | |
---|
| 2026 | /* this sets up crosslapping of a sample by using trailing data from |
---|
| 2027 | sample 1 and lapping it into the windowing buffer of sample 2 */ |
---|
| 2028 | int ov_crosslap(OggVorbis_File *vf1, OggVorbis_File *vf2){ |
---|
| 2029 | vorbis_info *vi1,*vi2; |
---|
| 2030 | float **lappcm; |
---|
| 2031 | float **pcm; |
---|
| 2032 | float *w1,*w2; |
---|
| 2033 | int n1,n2,i,ret,hs1,hs2; |
---|
| 2034 | |
---|
| 2035 | if(vf1==vf2)return(0); /* degenerate case */ |
---|
| 2036 | if(vf1->ready_state<OPENED)return(OV_EINVAL); |
---|
| 2037 | if(vf2->ready_state<OPENED)return(OV_EINVAL); |
---|
| 2038 | |
---|
| 2039 | /* the relevant overlap buffers must be pre-checked and pre-primed |
---|
| 2040 | before looking at settings in the event that priming would cross |
---|
| 2041 | a bitstream boundary. So, do it now */ |
---|
| 2042 | |
---|
| 2043 | ret=_ov_initset(vf1); |
---|
| 2044 | if(ret)return(ret); |
---|
| 2045 | ret=_ov_initprime(vf2); |
---|
| 2046 | if(ret)return(ret); |
---|
| 2047 | |
---|
| 2048 | vi1=ov_info(vf1,-1); |
---|
| 2049 | vi2=ov_info(vf2,-1); |
---|
| 2050 | hs1=ov_halfrate_p(vf1); |
---|
| 2051 | hs2=ov_halfrate_p(vf2); |
---|
| 2052 | |
---|
| 2053 | lappcm=alloca(sizeof(*lappcm)*vi1->channels); |
---|
| 2054 | n1=vorbis_info_blocksize(vi1,0)>>(1+hs1); |
---|
| 2055 | n2=vorbis_info_blocksize(vi2,0)>>(1+hs2); |
---|
| 2056 | w1=vorbis_window(&vf1->vd,0); |
---|
| 2057 | w2=vorbis_window(&vf2->vd,0); |
---|
| 2058 | |
---|
| 2059 | for(i=0;i<vi1->channels;i++) |
---|
| 2060 | lappcm[i]=alloca(sizeof(**lappcm)*n1); |
---|
| 2061 | |
---|
| 2062 | _ov_getlap(vf1,vi1,&vf1->vd,lappcm,n1); |
---|
| 2063 | |
---|
| 2064 | /* have a lapping buffer from vf1; now to splice it into the lapping |
---|
| 2065 | buffer of vf2 */ |
---|
| 2066 | /* consolidate and expose the buffer. */ |
---|
| 2067 | vorbis_synthesis_lapout(&vf2->vd,&pcm); |
---|
| 2068 | _analysis_output_always("pcmL",0,pcm[0],n1*2,0,0,0); |
---|
| 2069 | _analysis_output_always("pcmR",0,pcm[1],n1*2,0,0,0); |
---|
| 2070 | |
---|
| 2071 | /* splice */ |
---|
| 2072 | _ov_splice(pcm,lappcm,n1,n2,vi1->channels,vi2->channels,w1,w2); |
---|
| 2073 | |
---|
| 2074 | /* done */ |
---|
| 2075 | return(0); |
---|
| 2076 | } |
---|
| 2077 | |
---|
| 2078 | static int _ov_64_seek_lap(OggVorbis_File *vf,ogg_int64_t pos, |
---|
| 2079 | int (*localseek)(OggVorbis_File *,ogg_int64_t)){ |
---|
| 2080 | vorbis_info *vi; |
---|
| 2081 | float **lappcm; |
---|
| 2082 | float **pcm; |
---|
| 2083 | float *w1,*w2; |
---|
| 2084 | int n1,n2,ch1,ch2,hs; |
---|
| 2085 | int i,ret; |
---|
| 2086 | |
---|
| 2087 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 2088 | ret=_ov_initset(vf); |
---|
| 2089 | if(ret)return(ret); |
---|
| 2090 | vi=ov_info(vf,-1); |
---|
| 2091 | hs=ov_halfrate_p(vf); |
---|
| 2092 | |
---|
| 2093 | ch1=vi->channels; |
---|
| 2094 | n1=vorbis_info_blocksize(vi,0)>>(1+hs); |
---|
| 2095 | w1=vorbis_window(&vf->vd,0); /* window arrays from libvorbis are |
---|
| 2096 | persistent; even if the decode state |
---|
| 2097 | from this link gets dumped, this |
---|
| 2098 | window array continues to exist */ |
---|
| 2099 | |
---|
| 2100 | lappcm=alloca(sizeof(*lappcm)*ch1); |
---|
| 2101 | for(i=0;i<ch1;i++) |
---|
| 2102 | lappcm[i]=alloca(sizeof(**lappcm)*n1); |
---|
| 2103 | _ov_getlap(vf,vi,&vf->vd,lappcm,n1); |
---|
| 2104 | |
---|
| 2105 | /* have lapping data; seek and prime the buffer */ |
---|
| 2106 | ret=localseek(vf,pos); |
---|
| 2107 | if(ret)return ret; |
---|
| 2108 | ret=_ov_initprime(vf); |
---|
| 2109 | if(ret)return(ret); |
---|
| 2110 | |
---|
| 2111 | /* Guard against cross-link changes; they're perfectly legal */ |
---|
| 2112 | vi=ov_info(vf,-1); |
---|
| 2113 | ch2=vi->channels; |
---|
| 2114 | n2=vorbis_info_blocksize(vi,0)>>(1+hs); |
---|
| 2115 | w2=vorbis_window(&vf->vd,0); |
---|
| 2116 | |
---|
| 2117 | /* consolidate and expose the buffer. */ |
---|
| 2118 | vorbis_synthesis_lapout(&vf->vd,&pcm); |
---|
| 2119 | |
---|
| 2120 | /* splice */ |
---|
| 2121 | _ov_splice(pcm,lappcm,n1,n2,ch1,ch2,w1,w2); |
---|
| 2122 | |
---|
| 2123 | /* done */ |
---|
| 2124 | return(0); |
---|
| 2125 | } |
---|
| 2126 | |
---|
| 2127 | int ov_raw_seek_lap(OggVorbis_File *vf,ogg_int64_t pos){ |
---|
| 2128 | return _ov_64_seek_lap(vf,pos,ov_raw_seek); |
---|
| 2129 | } |
---|
| 2130 | |
---|
| 2131 | int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos){ |
---|
| 2132 | return _ov_64_seek_lap(vf,pos,ov_pcm_seek); |
---|
| 2133 | } |
---|
| 2134 | |
---|
| 2135 | int ov_pcm_seek_page_lap(OggVorbis_File *vf,ogg_int64_t pos){ |
---|
| 2136 | return _ov_64_seek_lap(vf,pos,ov_pcm_seek_page); |
---|
| 2137 | } |
---|
| 2138 | |
---|
| 2139 | static int _ov_d_seek_lap(OggVorbis_File *vf,double pos, |
---|
| 2140 | int (*localseek)(OggVorbis_File *,double)){ |
---|
| 2141 | vorbis_info *vi; |
---|
| 2142 | float **lappcm; |
---|
| 2143 | float **pcm; |
---|
| 2144 | float *w1,*w2; |
---|
| 2145 | int n1,n2,ch1,ch2,hs; |
---|
| 2146 | int i,ret; |
---|
| 2147 | |
---|
| 2148 | if(vf->ready_state<OPENED)return(OV_EINVAL); |
---|
| 2149 | ret=_ov_initset(vf); |
---|
| 2150 | if(ret)return(ret); |
---|
| 2151 | vi=ov_info(vf,-1); |
---|
| 2152 | hs=ov_halfrate_p(vf); |
---|
| 2153 | |
---|
| 2154 | ch1=vi->channels; |
---|
| 2155 | n1=vorbis_info_blocksize(vi,0)>>(1+hs); |
---|
| 2156 | w1=vorbis_window(&vf->vd,0); /* window arrays from libvorbis are |
---|
| 2157 | persistent; even if the decode state |
---|
| 2158 | from this link gets dumped, this |
---|
| 2159 | window array continues to exist */ |
---|
| 2160 | |
---|
| 2161 | lappcm=alloca(sizeof(*lappcm)*ch1); |
---|
| 2162 | for(i=0;i<ch1;i++) |
---|
| 2163 | lappcm[i]=alloca(sizeof(**lappcm)*n1); |
---|
| 2164 | _ov_getlap(vf,vi,&vf->vd,lappcm,n1); |
---|
| 2165 | |
---|
| 2166 | /* have lapping data; seek and prime the buffer */ |
---|
| 2167 | ret=localseek(vf,pos); |
---|
| 2168 | if(ret)return ret; |
---|
| 2169 | ret=_ov_initprime(vf); |
---|
| 2170 | if(ret)return(ret); |
---|
| 2171 | |
---|
| 2172 | /* Guard against cross-link changes; they're perfectly legal */ |
---|
| 2173 | vi=ov_info(vf,-1); |
---|
| 2174 | ch2=vi->channels; |
---|
| 2175 | n2=vorbis_info_blocksize(vi,0)>>(1+hs); |
---|
| 2176 | w2=vorbis_window(&vf->vd,0); |
---|
| 2177 | |
---|
| 2178 | /* consolidate and expose the buffer. */ |
---|
| 2179 | vorbis_synthesis_lapout(&vf->vd,&pcm); |
---|
| 2180 | |
---|
| 2181 | /* splice */ |
---|
| 2182 | _ov_splice(pcm,lappcm,n1,n2,ch1,ch2,w1,w2); |
---|
| 2183 | |
---|
| 2184 | /* done */ |
---|
| 2185 | return(0); |
---|
| 2186 | } |
---|
| 2187 | |
---|
| 2188 | int ov_time_seek_lap(OggVorbis_File *vf,double pos){ |
---|
| 2189 | return _ov_d_seek_lap(vf,pos,ov_time_seek); |
---|
| 2190 | } |
---|
| 2191 | |
---|
| 2192 | int ov_time_seek_page_lap(OggVorbis_File *vf,double pos){ |
---|
| 2193 | return _ov_d_seek_lap(vf,pos,ov_time_seek_page); |
---|
| 2194 | } |
---|