int main(int argc, char **argv)
{
StreamPlayer *player;
int i;
/* Print out usage if no file was specified */
if(argc < 2)
{
fprintf(stderr, "Usage: %s <filenames...>\n", argv[0]);
return 1;
}
if(InitAL() != 0)
return 1;
if(alIsExtensionPresent("AL_SOFT_buffer_samples"))
{
printf("AL_SOFT_buffer_samples supported!\n");
alBufferSamplesSOFT = alGetProcAddress("alBufferSamplesSOFT");
alIsBufferFormatSupportedSOFT = alGetProcAddress("alIsBufferFormatSupportedSOFT");
}
else
printf("AL_SOFT_buffer_samples not supported\n");
player = NewPlayer();
/* Play each file listed on the command line */
for(i = 1;i < argc;i++)
{
if(!OpenPlayerFile(player, argv[i]))
continue;
printf("Playing %s (%s, %s, %dhz)\n", argv[i],
TypeName(player->type), ChannelsName(player->channels),
player->rate);
fflush(stdout);
if(!StartPlayer(player))
{
ClosePlayerFile(player);
continue;
}
while(UpdatePlayer(player))
Sleep(10);
/* All done with this file. Close it and go to the next */
ClosePlayerFile(player);
}
printf("Done.\n");
/* All files done. Delete the player, and close OpenAL */
DeletePlayer(player);
player = NULL;
CloseAL();
return 0;
}
/* Opens the first audio stream of the named file. If a file is already open,
* it will be closed first. */
static int OpenPlayerFile(StreamPlayer *player, const char *filename)
{
ClosePlayerFile(player);
/* Open the file and get the first stream from it */
player->file = openAVFile(filename);
player->stream = getAVAudioStream(player->file, 0);
if(!player->stream)
{
fprintf(stderr, "Could not open audio in %s\n", filename);
goto error;
}
/* Get the stream format, and figure out the OpenAL format */
if(getAVAudioInfo(player->stream, &player->rate, &player->channels,
&player->type) != 0)
{
fprintf(stderr, "Error getting audio info for %s\n", filename);
goto error;
}
player->format = GetFormat(player->channels, player->type, alIsBufferFormatSupportedSOFT);
if(player->format == 0)
{
fprintf(stderr, "Unsupported format (%s, %s) for %s\n",
ChannelsName(player->channels), TypeName(player->type),
filename);
goto error;
}
/* Allocate enough space for the temp buffer, given the format */
player->datasize = FramesToBytes(BUFFER_SIZE, player->channels,
player->type);
player->data = malloc(player->datasize);
if(player->data == NULL)
{
fprintf(stderr, "Error allocating %d bytes\n", player->datasize);
goto error;
}
return 1;
error:
closeAVFile(player->file);
player->file = NULL;
player->stream = NULL;
player->datasize = 0;
return 0;
}
/* LoadBuffer loads the named audio file into an OpenAL buffer object, and
* returns the new buffer ID. */
static ALuint LoadSound(const char *filename)
{
ALenum err, format, type, channels;
ALuint rate, buffer;
size_t datalen;
void *data;
FilePtr sound;
/* Open the audio file */
sound = openAudioFile(filename, 1000);
if(!sound)
{
fprintf(stderr, "Could not open audio in %s\n", filename);
closeAudioFile(sound);
return 0;
}
/* Get the sound format, and figure out the OpenAL format */
if(getAudioInfo(sound, &rate, &channels, &type) != 0)
{
fprintf(stderr, "Error getting audio info for %s\n", filename);
closeAudioFile(sound);
return 0;
}
format = GetFormat(channels, type, NULL);
if(format == AL_NONE)
{
fprintf(stderr, "Unsupported format (%s, %s) for %s\n",
ChannelsName(channels), TypeName(type), filename);
closeAudioFile(sound);
return 0;
}
/* Decode the whole audio stream to a buffer. */
data = decodeAudioStream(sound, &datalen);
if(!data)
{
fprintf(stderr, "Failed to read audio from %s\n", filename);
closeAudioFile(sound);
return 0;
}
/* Buffer the audio data into a new buffer object, then free the data and
* close the file. */
buffer = 0;
alGenBuffers(1, &buffer);
alBufferData(buffer, format, data, datalen, rate);
free(data);
closeAudioFile(sound);
/* Check if an error occured, and clean up if so. */
err = alGetError();
if(err != AL_NO_ERROR)
{
fprintf(stderr, "OpenAL Error: %s\n", alGetString(err));
if(buffer && alIsBuffer(buffer))
alDeleteBuffers(1, &buffer);
return 0;
}
return buffer;
}
int main()
{
PlaybackInfo playback = { NULL, NULL, 0 };
SDL_AudioSpec desired, obtained;
ALuint source, buffer;
ALCint attrs[16];
ALenum state;
/* Print out error if extension is missing. */
if(!alcIsExtensionPresent(NULL, "ALC_SOFT_loopback"))
{
fprintf(stderr, "Error: ALC_SOFT_loopback not supported!\n");
return 1;
}
/* Define a macro to help load the function pointers. */
#define LOAD_PROC(x) ((x) = alcGetProcAddress(NULL, #x))
LOAD_PROC(alcLoopbackOpenDeviceSOFT);
LOAD_PROC(alcIsRenderFormatSupportedSOFT);
LOAD_PROC(alcRenderSamplesSOFT);
#undef LOAD_PROC
if(SDL_Init(SDL_INIT_AUDIO) == -1)
{
fprintf(stderr, "Failed to init SDL audio: %s\n", SDL_GetError());
return 1;
}
/* Set up SDL audio with our requested format and callback. */
desired.channels = 2;
desired.format = AUDIO_S16SYS;
desired.freq = 44100;
desired.padding = 0;
desired.samples = 4096;
desired.callback = RenderSDLSamples;
desired.userdata = &playback;
if(SDL_OpenAudio(&desired, &obtained) != 0)
{
SDL_Quit();
fprintf(stderr, "Failed to open SDL audio: %s\n", SDL_GetError());
return 1;
}
/* Set up our OpenAL attributes based on what we got from SDL. */
attrs[0] = ALC_FORMAT_CHANNELS_SOFT;
if(obtained.channels == 1)
attrs[1] = ALC_MONO_SOFT;
else if(obtained.channels == 2)
attrs[1] = ALC_STEREO_SOFT;
else
{
fprintf(stderr, "Unhandled SDL channel count: %d\n", obtained.channels);
goto error;
}
attrs[2] = ALC_FORMAT_TYPE_SOFT;
if(obtained.format == AUDIO_U8)
attrs[3] = ALC_UNSIGNED_BYTE_SOFT;
else if(obtained.format == AUDIO_S8)
attrs[3] = ALC_BYTE_SOFT;
else if(obtained.format == AUDIO_U16SYS)
attrs[3] = ALC_UNSIGNED_SHORT_SOFT;
else if(obtained.format == AUDIO_S16SYS)
attrs[3] = ALC_SHORT_SOFT;
else
{
fprintf(stderr, "Unhandled SDL format: 0x%04x\n", obtained.format);
goto error;
}
attrs[4] = ALC_FREQUENCY;
attrs[5] = obtained.freq;
attrs[6] = 0; /* end of list */
/* Initialize OpenAL loopback device, using our format attributes. */
playback.Device = alcLoopbackOpenDeviceSOFT(NULL);
if(!playback.Device)
{
fprintf(stderr, "Failed to open loopback device!\n");
goto error;
}
/* Make sure the format is supported before setting them on the device. */
if(alcIsRenderFormatSupportedSOFT(playback.Device, attrs[5], attrs[1], attrs[3]) == ALC_FALSE)
{
fprintf(stderr, "Render format not supported: %s, %s, %dhz\n",
ChannelsName(attrs[1]), TypeName(attrs[3]), attrs[5]);
goto error;
}
playback.Context = alcCreateContext(playback.Device, attrs);
if(!playback.Context || alcMakeContextCurrent(playback.Context) == ALC_FALSE)
{
fprintf(stderr, "Failed to set an OpenAL audio context\n");
goto error;
}
playback.FrameSize = FramesToBytes(1, attrs[1], attrs[3]);
/* Start SDL playing. Our callback (thus alcRenderSamplesSOFT) will now
* start being called regularly to update the AL playback state. */
SDL_PauseAudio(0);
/* Load the sound into a buffer. */
buffer = CreateSineWave();
if(!buffer)
{
SDL_CloseAudio();
alcDestroyContext(playback.Context);
alcCloseDevice(playback.Device);
SDL_Quit();
return 1;
}
/* Create the source to play the sound with. */
source = 0;
alGenSources(1, &source);
alSourcei(source, AL_BUFFER, buffer);
assert(alGetError()==AL_NO_ERROR && "Failed to setup sound source");
/* Play the sound until it finishes. */
alSourcePlay(source);
do {
Sleep(10);
alGetSourcei(source, AL_SOURCE_STATE, &state);
} while(alGetError() == AL_NO_ERROR && state == AL_PLAYING);
/* All done. Delete resources, and close OpenAL. */
alDeleteSources(1, &source);
alDeleteBuffers(1, &buffer);
/* Stop SDL playing. */
SDL_PauseAudio(1);
/* Close up OpenAL and SDL. */
SDL_CloseAudio();
alcDestroyContext(playback.Context);
alcCloseDevice(playback.Device);
SDL_Quit();
return 0;
error:
SDL_CloseAudio();
if(playback.Context)
alcDestroyContext(playback.Context);
if(playback.Device)
alcCloseDevice(playback.Device);
SDL_Quit();
return 1;
}
