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Potential fixes for audio on RPI and Emscripten builds.

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This commit is contained in:
David Reid 2017-11-24 22:13:33 +10:00
parent 5463e14886
commit a0d9913c7c
2 changed files with 17 additions and 4 deletions
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10
src/audio.c
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@ -393,14 +393,23 @@ void InitAudioDevice(void)
mal_result result = mal_context_init(NULL, 0, &contextConfig, &context);
if (result != MAL_SUCCESS)
{
TraceLog(LOG_ERROR, "Failed to initialize audio context");
return;
}
// Device. Using the default device. Format is floating point because it simplifies mixing.
mal_device_config deviceConfig = mal_device_config_init(DEVICE_FORMAT, DEVICE_CHANNELS, DEVICE_SAMPLE_RATE, NULL, OnSendAudioDataToDevice);
// Special case for PLATFORM_RPI.
#if defined(PLATFORM_RPI)
deviceConfig.alsa.noMMap = MAL_TRUE;
deviceConfig.bufferSizeInFrames = 2048;
#endif
result = mal_device_init(&context, mal_device_type_playback, NULL, &deviceConfig, NULL, &device);
if (result != MAL_SUCCESS)
{
TraceLog(LOG_ERROR, "Failed to initialize audio playback device");
mal_context_uninit(&context);
return;
}
@ -410,6 +419,7 @@ void InitAudioDevice(void)
result = mal_device_start(&device);
if (result != MAL_SUCCESS)
{
TraceLog(LOG_ERROR, "Failed to start audio playback device");
mal_device_uninit(&device);
mal_context_uninit(&context);
return;

11
src/external/mini_al.h vendored
View File

@ -8634,7 +8634,7 @@ mal_result mal_device_init__sdl(mal_context* pContext, mal_device_type type, mal
// SDL wants the buffer size to be a power of 2. The SDL_AudioSpec property for this is only a Uint16, so we need
// to explicitly clamp this because it will be easy to overflow.
mal_uint32 bufferSize = pConfig->bufferSizeInFrames * pConfig->periods * pConfig->channels;
mal_uint32 bufferSize = pConfig->bufferSizeInFrames;
if (bufferSize > 32768) {
bufferSize = 32768;
} else {
@ -8696,7 +8696,7 @@ mal_result mal_device_init__sdl(mal_context* pContext, mal_device_type type, mal
pDevice->internalFormat = mal_format_from_sdl(obtainedSpec.format);
pDevice->internalChannels = obtainedSpec.channels;
pDevice->internalSampleRate = (mal_uint32)obtainedSpec.freq;
pDevice->bufferSizeInFrames = obtainedSpec.samples / obtainedSpec.channels;
pDevice->bufferSizeInFrames = obtainedSpec.samples;
pDevice->periods = 1; // SDL doesn't seem to tell us what the period count is. Just set this 1.
#if 0
@ -10980,6 +10980,7 @@ const char* mal_get_backend_name(mal_backend backend)
case mal_backend_oss: return "OSS";
case mal_backend_opensl: return "OpenSL|ES";
case mal_backend_openal: return "OpenAL";
case mal_backend_sdl: return "SDL";
default: return "Unknown";
}
}
@ -11197,7 +11198,8 @@ void mal_pcm_s32_to_f32(float* pOut, const int* pIn, unsigned int count)
for (unsigned int i = 0; i < count; ++i) {
int x = pIn[i];
double t;
t = (double)(x + 2147483648LL);
t = (double)(x + 2147483647);
t = t + 1;
t = t * 0.0000000004656612873077392578125;
r = (float)(t - 1);
pOut[i] = (float)r;
@ -11255,7 +11257,8 @@ void mal_pcm_f32_to_s32(int* pOut, const float* pIn, unsigned int count)
c = ((x < -1) ? -1 : ((x > 1) ? 1 : x));
c = c + 1;
t = (mal_int64)(c * 2147483647.5);
r = (int)(t - 2147483648LL);
t = t - 2147483647;
r = (int)(t - 1);
pOut[i] = (int)r;
}
}