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BPS type added to ensure consistency

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This commit is contained in:
Joshua Reisenauer
2016-04-30 15:41:46 -07:00
parent 5f1e8b8278
commit a1038f61b6
3 changed files with 46 additions and 10 deletions
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42
src/audio.c
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@ -95,9 +95,12 @@ typedef struct Music {
// a dedicated mix channel.
typedef struct AudioContext_t {
unsigned short sampleRate; // default is 48000
unsigned char bitsPerSample; // 16 is default
BPS bitsPerSample; // 16 is default
mix_t mixChannel; // 0-3 or mixA-mixD, each mix channel can receive up to one dedicated audio stream
channel_t channels; // 1=mono, 2=stereo
ALenum alFormat; // openAL format specifier
ALuint alSource; // openAL source
ALuint alBuffer[2]; // openAL sample buffer
} AudioContext_t;
#if defined(AUDIO_STANDALONE)
@ -193,8 +196,8 @@ bool AudioDeviceReady(void)
// Audio contexts are for outputing custom audio waveforms, This will shut down any other sound sources currently playing
// The mix_t is what mix channel you want to operate on, mixA->mixD are the ones available. Each mix channel can only be used one at a time.
// exmple usage is InitAudioContext(48000, 16, mixA, stereo);
AudioContext InitAudioContext(unsigned short sampleRate, unsigned char bitsPerSample, mix_t mixChannel, channel_t channels)
// exmple usage is InitAudioContext(48000, sixteenBPS, mixA, stereo);
AudioContext InitAudioContext(unsigned short sampleRate, BPS bitsPerSample, mix_t mixChannel, channel_t channels)
{
if(!AudioDeviceReady()) InitAudioDevice();
else StopMusicStream();
@ -206,6 +209,30 @@ AudioContext InitAudioContext(unsigned short sampleRate, unsigned char bitsPerSa
ac->mixChannel = mixChannel;
ac->channels = channels;
mixChannelsActive_g[mixChannel] = ac;
// setup openAL format
if (channels == mono)
{
if (bitsPerSample == eightBPS ) ac->alFormat = AL_FORMAT_MONO8;
else if (bitsPerSample == sixteenBPS) ac->alFormat = AL_FORMAT_MONO16;
}
else if (channels == stereo)
{
if (bitsPerSample == eightBPS ) ac->alFormat = AL_FORMAT_STEREO8;
else if (bitsPerSample == sixteenBPS) ac->alFormat = AL_FORMAT_STEREO16;
}
// Create an audio source
alGenSources(1, &ac->alSource);
alSourcef(ac->alSource, AL_PITCH, 1);
alSourcef(ac->alSource, AL_GAIN, 1);
alSource3f(ac->alSource, AL_POSITION, 0, 0, 0);
alSource3f(ac->alSource, AL_VELOCITY, 0, 0, 0);
// Create Buffer
alGenBuffers(2, &ac->alBuffer);
return ac;
}
return NULL;
@ -216,15 +243,22 @@ void CloseAudioContext(AudioContext ctx)
{
AudioContext_t *context = (AudioContext_t*)ctx;
if(context){
alDeleteSources(1, &context->alSource);
alDeleteBuffers(2, &context->alBuffer);
mixChannelsActive_g[context->mixChannel] = NULL;
free(context);
ctx = NULL;
}
}
// Pushes more audio data into context mix channel, if none are ever pushed then zeros are fed in
void UpdateAudioContext(AudioContext ctx, void *data, unsigned short *dataLength)
{
;
AudioContext_t *context = (AudioContext_t*)ctx;
if(!musicEnabled && context && mixChannelsActive_g[context->mixChannel] == context)
{
;
}
}