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source: orxonox.OLD/orxonox/branches/sound/src/sdlwav.c @ 2780

Last change on this file since 2780 was 2777, checked in by simon, 20 years ago
/branches/sound: brought up sound_control.cc which doesn't do anything at the moment.
File size: 5.0 KB

Rev	Line
[2777]	1	#include "SDL.h"
	2	#include "SDL_thread.h"
	3	#include "SDL_mixer.h"
	4
	5	#include <stdarg.h>
	6	#include <unistd.h>
	7	#include <stdlib.h>
	8	#include <string.h>
	9	#include <stdio.h>
	10
	11	Sint16 stream[2][4096];
	12	int len=4096, done=0, need_refresh=0, bits=0, which=0;
	13	SDL_Surface *s=NULL;
	14	Uint32 flips=0;
	15	Uint32 black,white;
	16	float dy,dx;
	17
	18	/******************************************************************************/
	19	/* some simple exit and error routines */
	20
	21	void errorv(char *str, va_list ap)
	22	{
	23	vfprintf(stderr,str,ap);
	24	fprintf(stderr,": %s.\n", SDL_GetError());
	25	}
	26
	27	void cleanExit(char *str,...)
	28	{
	29	va_list ap;
	30	va_start(ap, str);
	31	errorv(str,ap);
	32	va_end(ap);
	33	Mix_CloseAudio();
	34	SDL_Quit();
	35	exit(1);
	36	}
	37
	38	/******************************************************************************/
	39	/* the postmix processor, only copies the stream buffer and indicates */
	40	/* a need for a screen refresh */
	41
	42	static void postmix(void udata, Uint8 _stream, int _len)
	43	{
	44	// save the stream buffer and indicate that we need a redraw
	45	len=_len;
	46	memcpy(stream[(which+1)%2],_stream,len>s->w4?s->w4:len);
	47	which=(which+1)%2;
	48	need_refresh=1;
	49	}
	50
	51	/******************************************************************************/
	52	/* redraw the wav and reset the need_refresh indicator */
	53
	54	void refresh()
	55	{
	56	int x,y,Y;
	57	Sint16 *buf;
	58
	59	buf=stream[which];
	60	need_refresh=0;
	61
	62	// clear the screen
	63	SDL_FillRect(s,NULL,black);
	64
	65	// draw the wav from the saved stream buffer
	66	Y=s->h/4;
	67	for(x=0;x<s->w*2;x++)
	68	{
	69	y=(buf[x]*dy);
	70	{
	71	if(y<0)
	72	{
	73	SDL_Rect r={x/2,Y+y,1,-y};
	74	SDL_FillRect(s,&r,white);
	75	}
	76	else
	77	{
	78	SDL_Rect r={x/2,Y,1,y};
	79	SDL_FillRect(s,&r,white);
	80	}
	81	}
	82	Y=Y>s->h/2?s->h/4:s->h*3/4;
	83	}
	84	SDL_Flip(s);
	85	flips++;
	86	}
	87
	88	/******************************************************************************/
	89
	90	int main(int argc, char **argv)
	91	{
	92	int audio_rate,audio_channels,
	93	// set this to any of 512,1024,2048,4096
	94	// the higher it is, the more FPS shown and CPU needed
	95	audio_buffers=512;
	96	Uint16 audio_format;
	97	Uint32 t;
	98	Mix_Music *music;
	99	int volume=SDL_MIX_MAXVOLUME;
	100
	101	// initialize SDL for audio and video
	102	if(SDL_Init(SDL_INIT_AUDIO\|SDL_INIT_VIDEO)<0)
	103	cleanExit("SDL_Init");
	104
	105	// open a screen for the wav output
	106	//if(!(s=SDL_SetVideoMode(1024,768,0,SDL_FULLSCREEN\|SDL_ANYFORMAT\|SDL_HWSURFACE\|SDL_DOUBLEBUF)))
	107	if(!(s=SDL_SetVideoMode(512,512,0,SDL_ANYFORMAT\|SDL_DOUBLEBUF)))
	108	cleanExit("SDL_SetVideoMode");
	109	SDL_WM_SetCaption("sdlwav - SDL_mixer demo","sdlwav");
	110
	111	// hide the annoying mouse pointer
	112	SDL_ShowCursor(SDL_DISABLE);
	113	// get the colors we use
	114	white=SDL_MapRGB(s->format,0xff,0xff,0xff);
	115	black=SDL_MapRGB(s->format,0,0,0);
	116
	117	// initialize sdl mixer, open up the audio device
	118	if(Mix_OpenAudio(44100,MIX_DEFAULT_FORMAT,2,audio_buffers)<0)
	119	cleanExit("Mix_OpenAudio");
	120
	121	// print out some info on the audio device and stream
	122	Mix_QuerySpec(&audio_rate, &audio_format, &audio_channels);
	123	bits=audio_format&0xFF;
	124	printf("Opened audio at %d Hz %d bit %s, %d bytes audio buffer\n", audio_rate,
	125	bits, audio_channels>1?"stereo":"mono", audio_buffers );
	126
	127	// calculate some parameters for the wav display
	128	dy=s->h/2.0/(float)(0x1<<bits);
	129	dx=s->w/(float)(0x1<<bits);
	130
	131	// load the song
	132	if(!(music=Mix_LoadMUS(argv[1])))
	133	cleanExit("Mix_LoadMUS(\"%s\")",argv[1]);
	134
	135	// set the post mix processor up
	136	Mix_SetPostMix(postmix,argv[1]);
	137
	138	// start playing and displaying the wav
	139	// wait for escape key of the quit event to finish
	140	t=SDL_GetTicks();
	141	if(Mix_PlayMusic(music, 1)==-1)
	142	cleanExit("Mix_PlayMusic(0x%p,1)",music);
	143	Mix_VolumeMusic(volume);
	144
	145	while((Mix_PlayingMusic() \|\| Mix_PausedMusic()) && !done)
	146	{
	147	SDL_Event e;
	148	while(SDL_PollEvent(&e))
	149	{
	150	switch(e.type)
	151	{
	152	case SDL_KEYDOWN:
	153	switch(e.key.keysym.sym)
	154	{
	155	case SDLK_ESCAPE:
	156	done=1;
	157	break;
	158	case SDLK_LEFT:
	159	Mix_RewindMusic();
	160	break;
	161	case SDLK_RIGHT:
	162	switch(Mix_GetMusicType(NULL))
	163	{
	164	case MUS_MP3:
	165	Mix_SetMusicPosition(+5);
	166	break;
	167	default:
	168	printf("cannot fast-forward this type of music\n");
	169	break;
	170	}
	171	break;
	172	case SDLK_UP:
	173	volume=(volume+1)<<1;
	174	if(volume>SDL_MIX_MAXVOLUME)
	175	volume=SDL_MIX_MAXVOLUME;
	176	Mix_VolumeMusic(volume);
	177	break;
	178	case SDLK_DOWN:
	179	volume>>=1;
	180	Mix_VolumeMusic(volume);
	181	break;
	182	case SDLK_SPACE:
	183	if(Mix_PausedMusic())
	184	Mix_ResumeMusic();
	185	else
	186	Mix_PauseMusic();
	187	break;
	188	default:
	189	break;
	190	}
	191	break;
	192	case SDL_QUIT:
	193	done=1;
	194	break;
	195	default:
	196	break;
	197	}
	198	}
	199	// the postmix processor tells us when there's new data to draw
	200	if(need_refresh)
	201	refresh();
	202	else
	203	SDL_Delay(0);
	204	}
	205	t=SDL_GetTicks()-t;
	206
	207	// free & close
	208	Mix_FreeMusic(music);
	209	Mix_CloseAudio();
	210	SDL_Quit();
	211	// show a silly statistic
	212	printf("fps=%.2f\n",((float)flips)/(t/1000.0));
	213	return(0);
	214	}

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