WallyHackenslacker/Aerofoil
1
0
Fork 0
mirror of https://github.com/elasota/Aerofoil.git synced 2025-09-23 06:53:43 +00:00
Code Issues Projects Releases Wiki Activity

Add volume control to SDL audio driver.

Browse Source
This commit is contained in:
elasota
2021-02-28 22:58:01 -05:00
parent e7246c1444
commit 15bdb97c38
1 changed files with 11 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
AerofoilSDL/GpAudioDriver_SDL2.cpp
View File

@@ -136,6 +136,7 @@ private:
static const size_t kMaxChannels = 16;
static const size_t kMixChunkSize = 256;
static const int16_t kMaxAudioVolumeScale = 25;
GpAudioChannel_SDL2 *m_channels[kMaxChannels];
size_t m_numChannels;
@@ -144,6 +145,8 @@ private:
GP_ALIGNED(GP_SYSTEM_MEMORY_ALIGNMENT) int16_t m_mixChunk[kMixChunkSize];
size_t m_mixChunkReadOffset;
int16_t m_audioVolumeScale;
};
GpAudioChannelBufferChain_SDL2::GpAudioChannelBufferChain_SDL2()
@@ -353,6 +356,7 @@ GpAudioDriver_SDL2::GpAudioDriver_SDL2(const GpAudioDriverProperties &properties
, m_numChannels(0)
, m_sdlAudioRunning(false)
, m_mixChunkReadOffset(kMixChunkSize)
, m_audioVolumeScale(kMaxAudioVolumeScale)
{
for (size_t i = 0; i < kMaxChannels; i++)
@@ -395,6 +399,9 @@ IGpAudioChannel *GpAudioDriver_SDL2::CreateChannel()
void GpAudioDriver_SDL2::SetMasterVolume(uint32_t vol, uint32_t maxVolume)
{
double scale = vol * static_cast<uint64_t>(kMaxAudioVolumeScale) / maxVolume;
m_audioVolumeScale = static_cast<int16_t>(scale);
}
void GpAudioDriver_SDL2::Shutdown()
@@ -527,6 +534,8 @@ void GpAudioDriver_SDL2::RefillMixChunk(GpAudioChannel_SDL2 *const*channels, siz
bool noAudio = true;
const int16_t audioVolumeScale = m_audioVolumeScale;
for (size_t i = 0; i < numChannels; i++)
{
channels[i]->Consume(audioMixBuffer, kMixChunkSize);
@@ -535,12 +544,12 @@ void GpAudioDriver_SDL2::RefillMixChunk(GpAudioChannel_SDL2 *const*channels, siz
{
noAudio = false;
for (size_t j = 0; j < kMixChunkSize; j++)
m_mixChunk[j] = (audioMixBuffer[j] - 0x80) * 25;
m_mixChunk[j] = (static_cast<int16_t>(audioMixBuffer[j]) - 0x80) * audioVolumeScale;
}
else
{
for (size_t j = 0; j < kMixChunkSize; j++)
m_mixChunk[j] += (audioMixBuffer[j] - 0x80) * 25;
m_mixChunk[j] += (static_cast<int16_t>(audioMixBuffer[j]) - 0x80) * audioVolumeScale;
}
}