diff options
Diffstat (limited to 'src/audio.c')
| -rw-r--r-- | src/audio.c | 36 |
1 files changed, 19 insertions, 17 deletions
diff --git a/src/audio.c b/src/audio.c index 9d1aa014..8a8ca4ef 100644 --- a/src/audio.c +++ b/src/audio.c @@ -59,6 +59,7 @@ // Defines and Macros //---------------------------------------------------------------------------------- #define MUSIC_STREAM_BUFFERS 2 +#define MAX_AUDIO_CONTEXTS 4 #if defined(PLATFORM_RPI) || defined(PLATFORM_ANDROID) // NOTE: On RPI and Android should be lower to avoid frame-stalls @@ -95,9 +96,9 @@ typedef struct Music { // a dedicated mix channel. typedef struct AudioContext_t { unsigned short sampleRate; // default is 48000 - 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 + unsigned char bitsPerSample; // 16 is default + unsigned char mixChannel; // 0-3 or mixA-mixD, each mix channel can receive up to one dedicated audio stream + unsigned char channels; // 1=mono, 2=stereo ALenum alFormat; // openAL format specifier ALuint alSource; // openAL source ALuint alBuffer[2]; // openAL sample buffer @@ -110,10 +111,10 @@ typedef enum { INFO = 0, ERROR, WARNING, DEBUG, OTHER } TraceLogType; //---------------------------------------------------------------------------------- // Global Variables Definition //---------------------------------------------------------------------------------- -static AudioContext_t* mixChannelsActive_g[4]; // What mix channels are currently active +static AudioContext_t* mixChannelsActive_g[MAX_AUDIO_CONTEXTS]; // What mix channels are currently active static bool musicEnabled = false; -static Music currentMusic; // Current music loaded - // NOTE: Only one music file playing at a time +static Music currentMusic; // Current music loaded + // NOTE: Only one music file playing at a time //---------------------------------------------------------------------------------- // Module specific Functions Declaration @@ -179,7 +180,7 @@ void CloseAudioDevice(void) } // True if call to InitAudioDevice() was successful and CloseAudioDevice() has not been called yet -bool AudioDeviceReady(void) +bool IsAudioDeviceReady(void) { ALCcontext *context = alcGetCurrentContext(); if (context == NULL) return false; @@ -195,11 +196,12 @@ 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, sixteenBPS, mixA, stereo); -AudioContext InitAudioContext(unsigned short sampleRate, BPS bitsPerSample, mix_t mixChannel, channel_t channels) +// The mixChannel is what mix channel you want to operate on, 0-3 are the ones available. Each mix channel can only be used one at a time. +// exmple usage is InitAudioContext(48000, 16, 0, 2); // stereo, mixchannel 1, 16bit, 48khz +AudioContext InitAudioContext(unsigned short sampleRate, unsigned char bitsPerSample, unsigned char mixChannel, unsigned char channels) { - if(!AudioDeviceReady()) InitAudioDevice(); + if(mixChannel > MAX_AUDIO_CONTEXTS) return NULL; + if(!IsAudioDeviceReady()) InitAudioDevice(); else StopMusicStream(); if(!mixChannelsActive_g[mixChannel]){ @@ -211,15 +213,15 @@ AudioContext InitAudioContext(unsigned short sampleRate, BPS bitsPerSample, mix_ mixChannelsActive_g[mixChannel] = ac; // setup openAL format - if (channels == mono) + if (channels == 1) { - if (bitsPerSample == eightBPS ) ac->alFormat = AL_FORMAT_MONO8; - else if (bitsPerSample == sixteenBPS) ac->alFormat = AL_FORMAT_MONO16; + if (bitsPerSample == 8 ) ac->alFormat = AL_FORMAT_MONO8; + else if (bitsPerSample == 16) ac->alFormat = AL_FORMAT_MONO16; } - else if (channels == stereo) + else if (channels == 2) { - if (bitsPerSample == eightBPS ) ac->alFormat = AL_FORMAT_STEREO8; - else if (bitsPerSample == sixteenBPS) ac->alFormat = AL_FORMAT_STEREO16; + if (bitsPerSample == 8 ) ac->alFormat = AL_FORMAT_STEREO8; + else if (bitsPerSample == 16) ac->alFormat = AL_FORMAT_STEREO16; } // Create an audio source |