diff options
Diffstat (limited to 'pica-client/audiodevice.cpp')
| -rw-r--r-- | pica-client/audiodevice.cpp | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/pica-client/audiodevice.cpp b/pica-client/audiodevice.cpp index 487df7e..aa4c42a 100644 --- a/pica-client/audiodevice.cpp +++ b/pica-client/audiodevice.cpp @@ -235,6 +235,12 @@ void AudioDevice::Capture() enc_ctx->time_base = AVRational{1, m_sampleRate}; applyMonoLayout(enc_ctx); + // "voip" favors speech intelligibility over faithfulness and has lower + // algorithmic delay than the default "audio" mode - a better fit for a + // live call than for e.g. music. Only libopus exposes this private + // option; harmless no-op on the native "opus" encoder fallback. + av_opt_set(enc_ctx->priv_data, "application", "voip", 0); + if ((ret = avcodec_open2(enc_ctx, enc, nullptr)) < 0) { QString msg = QString("Could not open Opus encoder: %1").arg(ff_errstr(ret)); @@ -473,6 +479,15 @@ void AudioDevice::Play() bool loggedResamplerError = false; bool loggedEncodeError = false; + // Preroll: wait for a small cushion of buffered packets before writing + // the first one, so ordinary arrival jitter doesn't immediately drain + // the queue and starve the ALSA buffer (heard as crackling/xruns). + { + QMutexLocker locker(&m_queueMutex); + while (m_playQueue.size() < kPrerollDepth && !m_abort.loadRelaxed()) + m_queueCond.wait(&m_queueMutex, 100); + } + while (true) { QByteArray pktData; |