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[WIP] Updates: simplify audio system

This commit is contained in:
Alex P 2025-09-30 12:36:41 +00:00
parent 76b80da157
commit fc38830af1
1 changed files with 8 additions and 2 deletions
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10
internal/audio/c/audio.c
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@ -571,6 +571,10 @@ int jetkvm_audio_capture_init() {
opus_encoder_ctl(encoder, OPUS_SET_DTX(opus_dtx)); opus_encoder_ctl(encoder, OPUS_SET_DTX(opus_dtx));
opus_encoder_ctl(encoder, OPUS_SET_LSB_DEPTH(opus_lsb_depth)); opus_encoder_ctl(encoder, OPUS_SET_LSB_DEPTH(opus_lsb_depth));
// Enable in-band FEC for packet loss resilience (adds ~2-5% bitrate)
opus_encoder_ctl(encoder, OPUS_SET_INBAND_FEC(1));
opus_encoder_ctl(encoder, OPUS_SET_PACKET_LOSS_PERC(10));
capture_initialized = 1; capture_initialized = 1;
capture_initializing = 0; capture_initializing = 0;
return 0; return 0;
@ -578,7 +582,7 @@ int jetkvm_audio_capture_init() {
/** /**
* Read HDMI audio, encode to Opus (OUTPUT path hot function) * Read HDMI audio, encode to Opus (OUTPUT path hot function)
* Process: ALSA capture → silence detection → 5x gain → Opus encode * Process: ALSA capture → silence detection → 2.5x gain → Opus encode
* @return >0 = Opus bytes, 0 = silence/no data, -1 = error * @return >0 = Opus bytes, 0 = silence/no data, -1 = error
*/ */
__attribute__((hot)) int jetkvm_audio_read_encode(void * __restrict__ opus_buf) { __attribute__((hot)) int jetkvm_audio_read_encode(void * __restrict__ opus_buf) {
@ -782,12 +786,14 @@ __attribute__((hot)) int jetkvm_audio_decode_write(void * __restrict__ opus_buf,
printf("[AUDIO_INPUT] jetkvm_audio_decode_write: Processing Opus packet - size=%d bytes\n", opus_size); printf("[AUDIO_INPUT] jetkvm_audio_decode_write: Processing Opus packet - size=%d bytes\n", opus_size);
} }
// Decode normally (FEC is automatically used if available in the packet)
int pcm_frames = opus_decode(decoder, in, opus_size, pcm_buffer, frame_size, 0); int pcm_frames = opus_decode(decoder, in, opus_size, pcm_buffer, frame_size, 0);
if (__builtin_expect(pcm_frames < 0, 0)) { if (__builtin_expect(pcm_frames < 0, 0)) {
if (trace_logging_enabled) { if (trace_logging_enabled) {
printf("[AUDIO_INPUT] jetkvm_audio_decode_write: Opus decode failed with error %d, attempting packet loss concealment\n", pcm_frames); printf("[AUDIO_INPUT] jetkvm_audio_decode_write: Opus decode failed with error %d, attempting packet loss concealment\n", pcm_frames);
} }
pcm_frames = opus_decode(decoder, NULL, 0, pcm_buffer, frame_size, 0); // Packet loss concealment: decode using FEC from next packet (if available)
pcm_frames = opus_decode(decoder, NULL, 0, pcm_buffer, frame_size, 1);
if (pcm_frames < 0) { if (pcm_frames < 0) {
if (trace_logging_enabled) { if (trace_logging_enabled) {
printf("[AUDIO_INPUT] jetkvm_audio_decode_write: Packet loss concealment also failed with error %d\n", pcm_frames); printf("[AUDIO_INPUT] jetkvm_audio_decode_write: Packet loss concealment also failed with error %d\n", pcm_frames);