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.h 13293 2007-07-24 00:09:47Z xiphmont $ |
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15 | |
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16 | ********************************************************************/ |
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17 | |
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18 | #ifndef _OV_FILE_H_ |
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19 | #define _OV_FILE_H_ |
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20 | |
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21 | #ifdef __cplusplus |
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22 | extern "C" |
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23 | { |
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24 | #endif /* __cplusplus */ |
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25 | |
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26 | #include <stdio.h> |
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27 | #include "codec.h" |
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28 | |
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29 | /* The function prototypes for the callbacks are basically the same as for |
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30 | * the stdio functions fread, fseek, fclose, ftell. |
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31 | * The one difference is that the FILE * arguments have been replaced with |
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32 | * a void * - this is to be used as a pointer to whatever internal data these |
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33 | * functions might need. In the stdio case, it's just a FILE * cast to a void * |
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34 | * |
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35 | * If you use other functions, check the docs for these functions and return |
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36 | * the right values. For seek_func(), you *MUST* return -1 if the stream is |
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37 | * unseekable |
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38 | */ |
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39 | typedef struct { |
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40 | size_t (*read_func) (void *ptr, size_t size, size_t nmemb, void *datasource); |
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41 | int (*seek_func) (void *datasource, ogg_int64_t offset, int whence); |
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42 | int (*close_func) (void *datasource); |
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43 | long (*tell_func) (void *datasource); |
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44 | } ov_callbacks; |
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45 | |
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46 | /* a few sets of convenient callbacks, especially for use under |
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47 | * Windows where ov_open_callbacks() should always be used instead of |
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48 | * ov_open() to avoid problems with incompatable crt.o version linking |
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49 | * issues. */ |
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50 | |
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51 | static int _ov_header_fseek_wrap(FILE *f,ogg_int64_t off,int whence){ |
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52 | if(f==NULL)return(-1); |
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53 | return fseek(f,off,whence); |
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54 | } |
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55 | |
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56 | static ov_callbacks OV_CALLBACKS_DEFAULT = { |
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57 | (size_t (*)(void *, size_t, size_t, void *)) fread, |
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58 | (int (*)(void *, ogg_int64_t, int)) _ov_header_fseek_wrap, |
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59 | (int (*)(void *)) fclose, |
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60 | (long (*)(void *)) ftell |
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61 | }; |
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62 | |
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63 | static ov_callbacks OV_CALLBACKS_NOCLOSE = { |
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64 | (size_t (*)(void *, size_t, size_t, void *)) fread, |
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65 | (int (*)(void *, ogg_int64_t, int)) _ov_header_fseek_wrap, |
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66 | (int (*)(void *)) NULL, |
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67 | (long (*)(void *)) ftell |
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68 | }; |
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69 | |
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70 | static ov_callbacks OV_CALLBACKS_STREAMONLY = { |
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71 | (size_t (*)(void *, size_t, size_t, void *)) fread, |
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72 | (int (*)(void *, ogg_int64_t, int)) NULL, |
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73 | (int (*)(void *)) fclose, |
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74 | (long (*)(void *)) NULL |
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75 | }; |
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76 | |
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77 | static ov_callbacks OV_CALLBACKS_STREAMONLY_NOCLOSE = { |
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78 | (size_t (*)(void *, size_t, size_t, void *)) fread, |
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79 | (int (*)(void *, ogg_int64_t, int)) NULL, |
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80 | (int (*)(void *)) NULL, |
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81 | (long (*)(void *)) NULL |
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82 | }; |
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83 | |
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84 | #define NOTOPEN 0 |
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85 | #define PARTOPEN 1 |
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86 | #define OPENED 2 |
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87 | #define STREAMSET 3 |
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88 | #define INITSET 4 |
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89 | |
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90 | typedef struct OggVorbis_File { |
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91 | void *datasource; /* Pointer to a FILE *, etc. */ |
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92 | int seekable; |
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93 | ogg_int64_t offset; |
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94 | ogg_int64_t end; |
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95 | ogg_sync_state oy; |
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96 | |
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97 | /* If the FILE handle isn't seekable (eg, a pipe), only the current |
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98 | stream appears */ |
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99 | int links; |
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100 | ogg_int64_t *offsets; |
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101 | ogg_int64_t *dataoffsets; |
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102 | long *serialnos; |
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103 | ogg_int64_t *pcmlengths; /* overloaded to maintain binary |
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104 | compatability; x2 size, stores both |
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105 | beginning and end values */ |
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106 | vorbis_info *vi; |
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107 | vorbis_comment *vc; |
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108 | |
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109 | /* Decoding working state local storage */ |
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110 | ogg_int64_t pcm_offset; |
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111 | int ready_state; |
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112 | long current_serialno; |
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113 | int current_link; |
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114 | |
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115 | double bittrack; |
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116 | double samptrack; |
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117 | |
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118 | ogg_stream_state os; /* take physical pages, weld into a logical |
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119 | stream of packets */ |
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120 | vorbis_dsp_state vd; /* central working state for the packet->PCM decoder */ |
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121 | vorbis_block vb; /* local working space for packet->PCM decode */ |
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122 | |
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123 | ov_callbacks callbacks; |
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124 | |
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125 | } OggVorbis_File; |
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126 | |
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127 | |
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128 | extern int ov_clear(OggVorbis_File *vf); |
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129 | extern int ov_fopen(char *path,OggVorbis_File *vf); |
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130 | extern int ov_open(FILE *f,OggVorbis_File *vf,char *initial,long ibytes); |
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131 | extern int ov_open_callbacks(void *datasource, OggVorbis_File *vf, |
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132 | char *initial, long ibytes, ov_callbacks callbacks); |
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133 | |
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134 | extern int ov_test(FILE *f,OggVorbis_File *vf,char *initial,long ibytes); |
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135 | extern int ov_test_callbacks(void *datasource, OggVorbis_File *vf, |
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136 | char *initial, long ibytes, ov_callbacks callbacks); |
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137 | extern int ov_test_open(OggVorbis_File *vf); |
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138 | |
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139 | extern long ov_bitrate(OggVorbis_File *vf,int i); |
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140 | extern long ov_bitrate_instant(OggVorbis_File *vf); |
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141 | extern long ov_streams(OggVorbis_File *vf); |
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142 | extern long ov_seekable(OggVorbis_File *vf); |
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143 | extern long ov_serialnumber(OggVorbis_File *vf,int i); |
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144 | |
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145 | extern ogg_int64_t ov_raw_total(OggVorbis_File *vf,int i); |
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146 | extern ogg_int64_t ov_pcm_total(OggVorbis_File *vf,int i); |
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147 | extern double ov_time_total(OggVorbis_File *vf,int i); |
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148 | |
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149 | extern int ov_raw_seek(OggVorbis_File *vf,ogg_int64_t pos); |
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150 | extern int ov_pcm_seek(OggVorbis_File *vf,ogg_int64_t pos); |
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151 | extern int ov_pcm_seek_page(OggVorbis_File *vf,ogg_int64_t pos); |
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152 | extern int ov_time_seek(OggVorbis_File *vf,double pos); |
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153 | extern int ov_time_seek_page(OggVorbis_File *vf,double pos); |
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154 | |
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155 | extern int ov_raw_seek_lap(OggVorbis_File *vf,ogg_int64_t pos); |
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156 | extern int ov_pcm_seek_lap(OggVorbis_File *vf,ogg_int64_t pos); |
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157 | extern int ov_pcm_seek_page_lap(OggVorbis_File *vf,ogg_int64_t pos); |
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158 | extern int ov_time_seek_lap(OggVorbis_File *vf,double pos); |
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159 | extern int ov_time_seek_page_lap(OggVorbis_File *vf,double pos); |
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160 | |
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161 | extern ogg_int64_t ov_raw_tell(OggVorbis_File *vf); |
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162 | extern ogg_int64_t ov_pcm_tell(OggVorbis_File *vf); |
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163 | extern double ov_time_tell(OggVorbis_File *vf); |
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164 | |
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165 | extern vorbis_info *ov_info(OggVorbis_File *vf,int link); |
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166 | extern vorbis_comment *ov_comment(OggVorbis_File *vf,int link); |
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167 | |
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168 | extern long ov_read_float(OggVorbis_File *vf,float ***pcm_channels,int samples, |
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169 | int *bitstream); |
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170 | extern long ov_read(OggVorbis_File *vf,char *buffer,int length, |
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171 | int bigendianp,int word,int sgned,int *bitstream); |
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172 | extern int ov_crosslap(OggVorbis_File *vf1,OggVorbis_File *vf2); |
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173 | |
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174 | extern int ov_halfrate(OggVorbis_File *vf,int flag); |
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175 | extern int ov_halfrate_p(OggVorbis_File *vf); |
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176 | |
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177 | #ifdef __cplusplus |
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178 | } |
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179 | #endif /* __cplusplus */ |
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180 | |
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181 | #endif |
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182 | |
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183 | |
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