mia/Aegisub
1
0
Fork 1
Code Issues Pull requests Projects Releases Wiki Activity

OpenAL: destroy context when not in use

Browse source 
This prevents the CoreAudio thread from spinning when paused on macOS
This commit is contained in:
Rodger Combs 2017-11-25 23:27:53 -06:00 committed by Thomas Goyne
parent 5a3b7301c6
commit 16d57dac79
1 changed files with 30 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

38
src/audio_player_openal.cpp
View file

@ -104,6 +104,9 @@ class OpenALPlayer final : public AudioPlayer, wxTimer {
/// wxTimer override to periodically fill available buffers
void Notify() override;
void InitContext();
void TeardownContext();
public:
OpenALPlayer(agi::AudioProvider *provider);
~OpenALPlayer();
@ -124,11 +127,24 @@ OpenALPlayer::OpenALPlayer(agi::AudioProvider *provider)
, samplerate(provider->GetSampleRate())
, bpf(provider->GetChannels() * provider->GetBytesPerSample())
{
try {
// Open device
device = alcOpenDevice(nullptr);
if (!device) throw AudioPlayerOpenError("Failed opening default OpenAL device");
// Determine buffer length
decode_buffer.resize(samplerate * bpf / num_buffers / 2); // buffers for half a second of audio
}
OpenALPlayer::~OpenALPlayer()
{
Stop();
alcCloseDevice(device);
}
void OpenALPlayer::InitContext()
{
if (context) return;
try {
// Create context
context = alcCreateContext(device, nullptr);
if (!context) throw AudioPlayerOpenError("Failed creating OpenAL context");
@ -151,27 +167,25 @@ OpenALPlayer::OpenALPlayer(agi::AudioProvider *provider)
catch (...)
{
alcDestroyContext(context);
alcCloseDevice(device);
context = nullptr;
throw;
}
// Determine buffer length
decode_buffer.resize(samplerate * bpf / num_buffers / 2); // buffers for half a second of audio
}
OpenALPlayer::~OpenALPlayer()
void OpenALPlayer::TeardownContext()
{
Stop();
if (!context) return;
alcMakeContextCurrent(context);
alDeleteSources(1, &source);
alDeleteBuffers(num_buffers, buffers);
alcMakeContextCurrent(nullptr);
alcDestroyContext(context);
alcCloseDevice(device);
context = nullptr;
}
void OpenALPlayer::Play(int64_t start, int64_t count)
{
InitContext();
alcMakeContextCurrent(context);
if (playing) {
// Quick reset
@ -201,6 +215,7 @@ void OpenALPlayer::Play(int64_t start, int64_t count)
void OpenALPlayer::Stop()
{
TeardownContext();
if (!playing) return;
// Reset data
@ -214,10 +229,12 @@ void OpenALPlayer::Stop()
alcMakeContextCurrent(context);
alSourceStop(source);
alSourcei(source, AL_BUFFER, 0);
alcMakeContextCurrent(nullptr);
}
void OpenALPlayer::FillBuffers(ALsizei count)
{
InitContext();
// Do the actual filling/queueing
for (count = mid(1, count, buffers_free); count > 0; --count) {
ALsizei fill_len = mid<ALsizei>(0, decode_buffer.size() / bpf, end_frame - cur_frame);
@ -240,6 +257,7 @@ void OpenALPlayer::FillBuffers(ALsizei count)
void OpenALPlayer::Notify()
{
InitContext();
alcMakeContextCurrent(context);
ALsizei newplayed;
alGetSourcei(source, AL_BUFFERS_PROCESSED, &newplayed);