ssize_t
load_audio_file(const char *name, char **data, size_t *size)
{
mm_file mf;
unsigned channels, rate;
const size_t def_size = 16 * 1024;
size_t offset = 0;
ssize_t read = 0;
double start = get_time();
/* make compiler happy */
start *= 1.0;
assert(name);
assert(data);
assert(size);
if (mm_open_fp(&mf, sOpen(name, "rb", FT_AUDIO)) < 0) {
return -1;
}
if (mm_audio_info(&mf, &channels, &rate) < 0) {
CWARNING3(audio, "no audio data in file `%s'", name);
mm_close(&mf);
return -1;
}
if (channels != 1 || rate != 11025) {
CERROR3(audio, "file `%s' should be mono, 11025Hz", name);
mm_close(&mf);
return -1;
}
if (!*data) {
*data = (char *)xmalloc(*size = def_size);
}
while (0 < (read = mm_decode_audio(&mf,
*data + offset, *size - offset))) {
offset += read;
if (*size <= offset) {
*data = (char *)xrealloc(*data, *size *= 2);
}
}
mm_close(&mf);
CDEBUG4(audio, "loading file `%s' took %5.4f seconds",
name, get_time() - start);
return offset;
}
int
main(int argc, char **argv)
{
char *file = NULL;
int have_video = 0, have_audio = 0;
unsigned h = 0, w = 0;
float fps = 0.0;
unsigned ch = 0, hz = 0;
struct audiobuf abuf;
int end = 0;
SDL_Surface *display = NULL;
SDL_Overlay *ovl = NULL;
SDL_Event event;
mm_file media;
if (argc > 1)
file = argv[1];
else
usage(argv[0]);
if (mm_open(&media, file) <= 0)
eprintf("No audio or video in `%s'\n", file);
if (mm_video_info(&media, &w, &h, &fps) >= 0)
{
printf("Video data: %dx%d, %gfps\n", w, h, fps);
have_video = 1;
}
if (mm_audio_info(&media, &ch, &hz) >= 0)
{
printf("Audio data: %s, %dHz\n", (ch == 1) ? "mono" : "stereo", hz);
have_audio = 1;
}
if (SDL_Init(SDL_INIT_AUDIO | SDL_INIT_VIDEO) < 0)
eprintf("Sdl init failed: %s\n", SDL_GetError());
if (have_video)
{
if ((display = SDL_SetVideoMode(w, h, 24,
SDL_HWSURFACE | SDL_DOUBLEBUF)) == NULL)
eprintf("SDL_SetVideoMode: %s\n", SDL_GetError());
if ((ovl = SDL_CreateYUVOverlay(w, h,
SDL_YV12_OVERLAY, display)) == NULL)
eprintf("SDL_CreateYUVOverlay: %s\n", SDL_GetError());
}
if (have_audio)
{
int bytes;
int bps;
double tdiff;
SDL_AudioSpec desired;
desired.channels = ch;
desired.freq = hz;
desired.format = AUDIO_U8;
bps = ch * 1;
desired.samples = 4096;
desired.callback = audio_cb;
desired.userdata = &abuf;
if (SDL_OpenAudio(&desired, NULL) < 0)
eprintf("SDL_OpenAudio: %s\n", SDL_GetError());
abuf.size = 4 * 4096;
abuf.off = 0;
abuf.bytes = 0;
abuf.buf = xmalloc(abuf.size);
tdiff = get_time();
while ((bytes = mm_decode_audio(&media,
abuf.buf + abuf.bytes, abuf.size - abuf.bytes)) > 0)
{
abuf.bytes += bytes;
if (abuf.size - abuf.bytes <= 4096)
abuf.buf = xrealloc(abuf.buf, abuf.size *= 2);
};
if (bytes < 0)
eperror("convert_audio");
printf("Decoding: %.3f seconds\n", get_time() - tdiff);
printf("Audio: %d samples, %.2f seconds\n", abuf.bytes / bps,
(double) (abuf.bytes) / bps / desired.freq);
SDL_PauseAudio(0);
}
while (!end)
{
while (SDL_PollEvent(&event))
switch (event.type)
{
case SDL_QUIT:
end = 1;
break;
case SDL_KEYDOWN:
if (event.key.keysym.sym == SDLK_q
|| event.key.keysym.sym == SDLK_ESCAPE)
end = 1;
break;
default:
break;
}
if (have_video && !end)
{
static double oldt, newt;
if (mm_decode_video(&media, ovl) > 0)
{
SDL_Rect r = { 0, 0, w, h };
newt = 1 / fps + oldt - get_time();
if (newt > 0)
SDL_Delay(newt * 1000);
SDL_DisplayYUVOverlay(ovl, &r);
oldt = get_time();
}
else
end = 1;
}
if (have_audio && abuf.bytes <= 0)
end = 1;
if (!have_video)
SDL_Delay(100);
}
if (have_audio)
{
SDL_PauseAudio(1);
free(abuf.buf);
}
if (have_video)
{
SDL_FreeYUVOverlay(ovl);
}
SDL_Quit();
mm_close(&media);
return EXIT_SUCCESS;
}
