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final fix for audiocontext system

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now it works
This commit is contained in:
Joshua Reisenauer 2016-05-10 01:54:20 -07:00
parent e660700924
commit b7f8e97b03
1 changed files with 51 additions and 23 deletions
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66
src/audio.c
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@ -102,6 +102,7 @@ typedef struct AudioContext_t {
unsigned char channels; // 1=mono,2=stereo
unsigned char mixChannel; // 0-3 or mixA-mixD, each mix channel can receive up to one dedicated audio stream
bool floatingPoint; // if false then the short datatype is used instead
bool playing;
ALenum alFormat; // openAL format specifier
ALuint alSource; // openAL source
ALuint alBuffer[MAX_STREAM_BUFFERS]; // openAL sample buffer
@ -211,7 +212,7 @@ AudioContext InitAudioContext(unsigned short sampleRate, unsigned char mixChanne
else StopMusicStream();
if(!mixChannelsActive_g[mixChannel]){
AudioContext_t *ac = malloc(sizeof(AudioContext_t));
AudioContext_t *ac = (AudioContext_t*)malloc(sizeof(AudioContext_t));
ac->sampleRate = sampleRate;
ac->channels = channels;
ac->mixChannel = mixChannel;
@ -250,8 +251,8 @@ AudioContext InitAudioContext(unsigned short sampleRate, unsigned char mixChanne
FillAlBufferWithSilence(ac, ac->alBuffer[x]);
alSourceQueueBuffers(ac->alSource, MAX_STREAM_BUFFERS, ac->alBuffer);
alSourcei(ac->alSource, AL_LOOPING, AL_FALSE); // this could cause errors
alSourcePlay(ac->alSource);
ac->playing = true;
return ac;
}
@ -264,6 +265,7 @@ void CloseAudioContext(AudioContext ctx)
AudioContext_t *context = (AudioContext_t*)ctx;
if(context){
alSourceStop(context->alSource);
context->playing = false;
//flush out all queued buffers
ALuint buffer = 0;
@ -287,22 +289,29 @@ void CloseAudioContext(AudioContext ctx)
// Pushes more audio data into context mix channel, if none are ever pushed then zeros are fed in.
// Call "UpdateAudioContext(ctx, NULL, 0)" if you want to pause the audio.
// @Returns number of samples that where processed.
// All data streams should be of a length that is evenly divisible by MUSIC_BUFFER_SIZE,
// otherwise the remaining data will not be pushed.
unsigned short UpdateAudioContext(AudioContext ctx, void *data, unsigned short numberElements)
{
AudioContext_t *context = (AudioContext_t*)ctx;
if(context && context->channels == 2 && numberElements % 2 != 0) return 0; // when there is two channels there must be an even number of samples
if(!context || (context->channels == 2 && numberElements % 2 != 0)) return 0; // when there is two channels there must be an even number of samples
if (!data || !numberElements) alSourcePause(context->alSource); // pauses audio until data is given
else{ // restart audio otherwise
if (!data || !numberElements)
{ // pauses audio until data is given
alSourcePause(context->alSource);
context->playing = false;
return 0;
}
else
{ // restart audio otherwise
ALint state;
alGetSourcei(context->alSource, AL_SOURCE_STATE, &state);
if (state != AL_PLAYING) alSourcePlay(context->alSource);
if (state != AL_PLAYING){
alSourcePlay(context->alSource);
context->playing = true;
}
}
if (context && mixChannelsActive_g[context->mixChannel] == context)
if (context && context->playing && mixChannelsActive_g[context->mixChannel] == context)
{
ALint processed = 0;
ALuint buffer = 0;
@ -311,36 +320,55 @@ unsigned short UpdateAudioContext(AudioContext ctx, void *data, unsigned short n
alGetSourcei(context->alSource, AL_BUFFERS_PROCESSED, &processed); // Get the number of already processed buffers (if any)
if(!processed) return 0;//nothing to process, queue is still full
if(!processed) return 0; // nothing to process, queue is still full
if(numberRemaining)// buffer data stream in increments of MUSIC_BUFFER_SIZE
{
while (processed > 0)
{
if(context->floatingPoint && numberRemaining >= MUSIC_BUFFER_SIZE_FLOAT) // process float buffers
if(context->floatingPoint) // process float buffers
{
float *ptr = (float*)data;
alSourceUnqueueBuffers(context->alSource, 1, &buffer);
if(numberRemaining >= MUSIC_BUFFER_SIZE_FLOAT)
{
alBufferData(buffer, context->alFormat, &ptr[numberProcessed], MUSIC_BUFFER_SIZE_FLOAT*sizeof(float), context->sampleRate);
alSourceQueueBuffers(context->alSource, 1, &buffer);
numberProcessed+=MUSIC_BUFFER_SIZE_FLOAT;
numberRemaining-=MUSIC_BUFFER_SIZE_FLOAT;
}
else if(!context->floatingPoint && numberRemaining >= MUSIC_BUFFER_SIZE_SHORT) // process short buffers
else
{
alBufferData(buffer, context->alFormat, &ptr[numberProcessed], numberRemaining*sizeof(float), context->sampleRate);
numberProcessed+=numberRemaining;
numberRemaining=0;
}
alSourceQueueBuffers(context->alSource, 1, &buffer);
processed--;
}
else if(!context->floatingPoint) // process short buffers
{
short *ptr = (short*)data;
alSourceUnqueueBuffers(context->alSource, 1, &buffer);
alBufferData(buffer, context->alFormat, &ptr[numberProcessed], MUSIC_BUFFER_SIZE_SHORT*sizeof(short), context->sampleRate);
alSourceQueueBuffers(context->alSource, 1, &buffer);
if(numberRemaining >= MUSIC_BUFFER_SIZE_SHORT)
{
alBufferData(buffer, context->alFormat, &ptr[numberProcessed], MUSIC_BUFFER_SIZE_FLOAT*sizeof(short), context->sampleRate);
numberProcessed+=MUSIC_BUFFER_SIZE_SHORT;
numberRemaining-=MUSIC_BUFFER_SIZE_SHORT;
}
else
{
alBufferData(buffer, context->alFormat, &ptr[numberProcessed], numberRemaining*sizeof(short), context->sampleRate);
numberProcessed+=numberRemaining;
numberRemaining=0;
}
alSourceQueueBuffers(context->alSource, 1, &buffer);
processed--;
}
}
else
break;
}
return numberProcessed;
}
return 0;
}
// fill buffer with zeros, returns number processed