c/sampler/c/sdl-old2.c

   1 /* play.c - a simple utility to play WAV files (not part of tcpsound)
   2  */
   3
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7 //#include <mba/msgno.h>
   8 #include <SDL/SDL.h>
   9 #include <SDL/SDL_audio.h>
  10
  11 #define NUM_SOUNDS 5
  12
  13 struct sample {
  14     Uint8 *data;
  15     Uint32 dpos;
  16     Uint32 dlen;
  17 } sounds[NUM_SOUNDS];
  18
  19 void
  20 mixaudio(void *unused, Uint8 *stream, int len)
  21 {
  22         int i;
  23         Uint32 amount;
  24         for (i = 0; i < NUM_SOUNDS; i++) {
  25                 amount = (sounds[i].dlen-sounds[i].dpos);
  26                 if (amount > (Uint32)len) {
  27                         amount = len;
  28                 }
  29                 SDL_MixAudio(stream, &sounds[i].data[sounds[i].dpos], amount, SDL_MIX_MAXVOLUME);
  30                 sounds[i].dpos += amount;
  31         }
  32         (void)unused;
  33 }
  34
  35 void
  36 PlaySound(char *file)
  37 {
  38         int index;
  39         SDL_AudioSpec wave;
  40         Uint8 *data;
  41         Uint32 dlen;
  42         SDL_AudioCVT cvt;
  43
  44         /* Look for an empty (or finished) sound slot */
  45         for ( index=0; index<NUM_SOUNDS; ++index ) {
  46                 if ( sounds[index].dpos == sounds[index].dlen ) {
  47                         break;
  48                 }
  49         }
  50         if ( index == NUM_SOUNDS )
  51                 return;
  52
  53         /* Load the sound file and convert it to 16-bit stereo at 22kHz */
  54         if ( SDL_LoadWAV(file, &wave, &data, &dlen) == NULL ) {
  55                 fprintf(stderr, "Couldn't load %s: %s\n", file, SDL_GetError());
  56                 return;
  57         }
  58         SDL_BuildAudioCVT(&cvt, wave.format, wave.channels, wave.freq, AUDIO_S16, 2, 22050);
  59         cvt.buf = malloc(dlen*cvt.len_mult);
  60         memcpy(cvt.buf, data, dlen);
  61         cvt.len = dlen;
  62         SDL_ConvertAudio(&cvt);
  63         SDL_FreeWAV(data);
  64
  65         /* Put the sound data in the slot (it starts playing immediately) */
  66         if (sounds[index].data) {
  67                 free(sounds[index].data);
  68         }
  69         SDL_LockAudio();
  70         sounds[index].data = cvt.buf;
  71         sounds[index].dlen = cvt.len_cvt;
  72         sounds[index].dpos = 0;
  73         SDL_UnlockAudio();
  74 }
  75
  76 int
  77 main(int argc, char *argv[])
  78 {
  79         SDL_AudioSpec fmt;
  80         int i;
  81
  82         if (argc < 2) {
  83                 fprintf(stderr, "usage: %s <file.wav>\n", argv[0]);
  84                 return EXIT_FAILURE;
  85         }
  86
  87         /* Set 16-bit stereo audio at 22Khz */
  88         fmt.freq = 22050;
  89         fmt.format = AUDIO_S16;
  90         fmt.channels = 2;
  91         fmt.samples = 512;        /* A good value for games */
  92         fmt.callback = mixaudio;
  93         fmt.userdata = NULL;
  94
  95         /* Open the audio device and start playing sound! */
  96         if (SDL_OpenAudio(&fmt, NULL) < 0) {
  97                 printf("Unable to open audio: %s\n", SDL_GetError());
  98                 return EXIT_FAILURE;
  99         }
 100
 101         SDL_PauseAudio(0);
 102
 103         for (i = 1; i < argc; i++) {
 104                 fprintf(stderr, "%s", argv[i]);
 105                 PlaySound(argv[i]);
 106 /*              fgetc(stdin);
 107  */
 108 sleep(2);
 109         }
 110
 111         SDL_CloseAudio();
 112
 113         return EXIT_SUCCESS;
 114 }
 115