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openal: Don't assume alSourceUnqueueBuffers is FIFO

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This commit is contained in:
Sam Edwards 2018-03-01 14:55:41 -07:00
parent 89799bc024
commit 1862100bac
1 changed files with 28 additions and 12 deletions
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40
panda/src/audiotraits/openalAudioSound.cxx
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@ -446,18 +446,34 @@ pull_used_buffers() {
int err = alGetError();
if (err == AL_NO_ERROR) {
if (_stream_queued[0]._buffer != buffer) {
audio_error("corruption in stream queue");
cleanup();
return;
}
_stream_queued.pop_front();
if (_stream_queued.size()) {
double al = _stream_queued[0]._time_offset + _stream_queued[0]._loop_index * _length;
double rtc = TrueClock::get_global_ptr()->get_short_time();
correct_calibrated_clock(rtc, al);
}
if (buffer != _sd->_sample) {
alDeleteBuffers(1,&buffer);
// This is certainly atypical: most implementations of OpenAL unqueue
// buffers in FIFO order. However, some (e.g. Apple's) can unqueue
// buffers out-of-order if playback is interrupted. So, we don't freak
// out unless `buffer` isn't in _stream_queued at all.
bool found_culprit = false;
for (auto it = _stream_queued.begin(); it != _stream_queued.end(); ++it) {
if (it->_buffer == buffer) {
// Phew. Found it. Just remove that.
_stream_queued.erase(it);
found_culprit = true;
break;
}
}
if (!found_culprit) {
audio_error("corruption in stream queue");
cleanup();
return;
}
} else {
_stream_queued.pop_front();
if (_stream_queued.size()) {
double al = _stream_queued[0]._time_offset + _stream_queued[0]._loop_index * _length;
double rtc = TrueClock::get_global_ptr()->get_short_time();
correct_calibrated_clock(rtc, al);
}
if (buffer != _sd->_sample) {
alDeleteBuffers(1,&buffer);
}
}
} else {
break;