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Fix crackling audio on Linux

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This commit is contained in:
loki 2021-07-23 18:43:35 +02:00
parent bc52fe9b82
commit 2a5fd78789
1 changed files with 13 additions and 2 deletions
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15
sunshine/audio.cpp
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@ -87,11 +87,14 @@ void encodeThread(sample_queue_t samples, config_t config, void *channel_data) {
OPUS_APPLICATION_AUDIO,
nullptr) };
opus_multistream_encoder_ctl(opus.get(), OPUS_SET_VBR(0));
// For some reason, audio is crackling when the encoder is set to constant bitstream.
// We simulate a constant bitstream with OPUS_SET_BITRATE(OPUS_BITRATE_MAX) -->
// which tries to occupy as much space as possible in the packet
opus_multistream_encoder_ctl(opus.get(), OPUS_SET_BITRATE(OPUS_BITRATE_MAX));
auto frame_size = config.packetDuration * stream->sampleRate / 1000;
while(auto sample = samples->pop()) {
buffer_t packet { 1024 }; // 1KB
buffer_t packet { 1400 }; // 1KB
int bytes = opus_multistream_encode(opus.get(), sample->data(), frame_size, std::begin(packet), packet.size());
if(bytes < 0) {
@ -101,6 +104,14 @@ void encodeThread(sample_queue_t samples, config_t config, void *channel_data) {
return;
}
// Even with OPUS_SET_BITRATE(OPUS_BITRATE_MAX), silent packets are smaller than the rest
// Drop silent packets to ensure Moonlight won't complain
// A packet size of 128 seems a reasonable enough threshold
if(bytes < 128) {
BOOST_LOG(verbose) << "Dropped silent packet"sv;
continue;
}
packet.fake_resize(bytes);
packets->raise(channel_data, std::move(packet));
}