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Refactor callback code

This commit is contained in:
Ted John 2017-01-03 19:53:36 +00:00
parent 983c59c9ff
commit f23d3c4e1c
1 changed files with 21 additions and 11 deletions
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32
src/audio/mixer.cpp
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@ -80,7 +80,11 @@ public:
want.format = AUDIO_S16SYS;
want.channels = 2;
want.samples = 1024;
want.callback = Callback;
want.callback = [](void * arg, uint8 * dst, int length) -> void
{
auto mixer = static_cast<AudioMixer *>(arg);
mixer->GetNextAudioChunk(dst, (size_t)length);
};
want.userdata = this;
SDL_AudioSpec have;
@ -212,25 +216,28 @@ private:
}
}
static void SDLCALL Callback(void * arg, uint8 * stream, int length)
void GetNextAudioChunk(uint8 * dst, size_t length)
{
auto mixer = static_cast<AudioMixer *>(arg);
UpdateAdjustedSound();
Memory::Set(stream, 0, length);
std::list<IAudioChannel *>::iterator it = mixer->_channels.begin();
while (it != mixer->_channels.end())
// Zero the output buffer
Memory::Set(dst, 0, length);
// Mix channels onto output buffer
std::list<IAudioChannel *>::iterator it = _channels.begin();
while (it != _channels.end())
{
IAudioChannel * channel = *it;
int group = channel->GetGroup();
if (group != MIXER_GROUP_SOUND || gConfigSound.sound_enabled)
{
mixer->MixChannel(channel, stream, length);
MixChannel(channel, dst, length);
}
if ((channel->IsDone() && channel->DeleteOnDone()) || channel->IsStopping())
{
delete channel;
it = mixer->_channels.erase(it);
it = _channels.erase(it);
}
else
{
@ -239,7 +246,7 @@ private:
}
}
void MixChannel(IAudioChannel * channel, uint8 * data, int length)
void UpdateAdjustedSound()
{
// Did the volume level get changed? Recalculate level in this case.
if (_settingSoundVolume != gConfigSound.sound_volume)
@ -252,9 +259,12 @@ private:
_settingMusicVolume = gConfigSound.ride_music_volume;
_adjustMusicVolume = powf(_settingMusicVolume / 100.f, 10.f / 6.f);
}
}
void MixChannel(IAudioChannel * channel, uint8 * data, size_t length)
{
int byteRate = _format.GetByteRate();
int numSamples = length / byteRate;
int numSamples = (int)(length / byteRate);
double rate = 1;
if (_format.format == AUDIO_S16SYS)
{
@ -320,7 +330,7 @@ private:
int mixVolume = ApplyVolume(channel, buffer, bufferLen);
// Finally mix on to destination buffer
size_t dstLength = Math::Min((size_t)length, bufferLen);
size_t dstLength = Math::Min(length, bufferLen);
SDL_MixAudioFormat(data, (const Uint8 *)buffer, _format.format, (Uint32)dstLength, mixVolume);
channel->UpdateOldVolume();