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Add 7.1 surround sound support to libsoundio audio renderer

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This commit is contained in:
Cameron Gutman 2020-04-04 09:49:10 -07:00
parent 524e92c81a
commit ea62e33e51
1 changed files with 29 additions and 12 deletions
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41
app/streaming/audio/renderers/soundioaudiorenderer.cpp
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@ -72,11 +72,17 @@ int SoundIoAudioRenderer::scoreChannelLayout(const struct SoundIoChannelLayout*
score++;
break;
// Score layouts using the back L/R as higher
// value than those using side L/R.
case SoundIoChannelIdBackLeft:
case SoundIoChannelIdBackRight:
score += 2;
if (opusConfig->channelCount == 6) {
// Score back channels higher in 5.1 mode to
// discourage selection of side channel layouts.
score += 2;
}
else {
// Score back channels normally for 7.1 mode
score++;
}
break;
default:
@ -211,13 +217,25 @@ bool SoundIoAudioRenderer::prepareForPlayback(const OPUS_MULTISTREAM_CONFIGURATI
m_EffectiveLayout = m_OutputStream->layout;
for (int i = 0; i < m_EffectiveLayout.channel_count; i++) {
// Fixup the layout to use back L/R so our channel position
// logic in sioWriteCallback() works.
if (m_EffectiveLayout.channels[i] == SoundIoChannelIdSideLeft) {
m_EffectiveLayout.channels[i] = SoundIoChannelIdBackLeft;
if (opusConfig->channelCount == 6) {
// For 5.1, replace side L/R with back L/R so our channel position
// logic in sioWriteCallback() works.
if (m_EffectiveLayout.channels[i] == SoundIoChannelIdSideLeft) {
m_EffectiveLayout.channels[i] = SoundIoChannelIdBackLeft;
}
if (m_EffectiveLayout.channels[i] == SoundIoChannelIdSideRight) {
m_EffectiveLayout.channels[i] = SoundIoChannelIdBackRight;
}
}
if (m_EffectiveLayout.channels[i] == SoundIoChannelIdSideRight) {
m_EffectiveLayout.channels[i] = SoundIoChannelIdBackRight;
else if (opusConfig->channelCount == 8) {
// For 5.1, replace side L/R with LOC/ROC so our channel position
// logic in sioWriteCallback() works.
if (m_EffectiveLayout.channels[i] == SoundIoChannelIdSideLeft) {
m_EffectiveLayout.channels[i] = SoundIoChannelIdFrontLeftCenter;
}
if (m_EffectiveLayout.channels[i] == SoundIoChannelIdSideRight) {
m_EffectiveLayout.channels[i] = SoundIoChannelIdFrontRightCenter;
}
}
}
@ -411,9 +429,8 @@ void SoundIoAudioRenderer::sioWriteCallback(SoundIoOutStream* stream, int frameC
for (int frame = 0; frame < frameCount; frame++) {
for (int ch = 0; ch < me->m_EffectiveLayout.channel_count; ch++) {
// SoundIoChannelId - 1 happens to match Moonlight's channel layout.
// For side L/R, this logic depends on us fixing those up
// in m_EffectiveLayout to back L/R.
// SoundIoChannelId - 1 happens to match Moonlight's channel layout
// after we've applied our fixups to m_EffectiveLayout for 5.1 and 7.1.
int readPtrChannel = me->m_EffectiveLayout.channels[ch] - 1;
if (frame >= framesLeft || readPtrChannel >= me->m_OpusChannelCount) {