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[WIP] Updates: simplify audio system

This commit is contained in:
Alex P 2025-09-30 11:03:34 +00:00
parent f6dd605ea6
commit 753c613708
2 changed files with 28 additions and 4 deletions
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28
internal/audio/c/audio.c
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@ -62,8 +62,8 @@ static int frame_size = 960; // Frames per Opus packet
static int opus_bitrate = 96000; // Bitrate: 96 kbps (optimal for stereo @ 48kHz) static int opus_bitrate = 96000; // Bitrate: 96 kbps (optimal for stereo @ 48kHz)
static int opus_complexity = 1; // Complexity: 1 (minimal CPU, ~0.5% on RV1106) static int opus_complexity = 1; // Complexity: 1 (minimal CPU, ~0.5% on RV1106)
static int opus_vbr = 1; // VBR: enabled for efficient encoding static int opus_vbr = 1; // VBR: enabled for efficient encoding
static int opus_vbr_constraint = 0; // Unconstrained VBR: allows bitrate spikes for transients (beeps/sharp sounds) static int opus_vbr_constraint = 1; // Constrained VBR: predictable bitrate
static int opus_signal_type = 3002; // Signal: OPUS_SIGNAL_MUSIC (3002) static int opus_signal_type = -1000; // Signal: OPUS_AUTO (automatic voice/music detection)
static int opus_bandwidth = 1103; // Bandwidth: WIDEBAND (1103 = native 48kHz, no resampling) static int opus_bandwidth = 1103; // Bandwidth: WIDEBAND (1103 = native 48kHz, no resampling)
static int opus_dtx = 0; // DTX: disabled (continuous audio stream) static int opus_dtx = 0; // DTX: disabled (continuous audio stream)
static int opus_lsb_depth = 16; // LSB depth: 16-bit matches S16_LE input static int opus_lsb_depth = 16; // LSB depth: 16-bit matches S16_LE input
@ -870,6 +870,30 @@ retry_read:
simd_clear_samples_s16(&pcm_buffer[pcm_rc * channels], remaining_samples); simd_clear_samples_s16(&pcm_buffer[pcm_rc * channels], remaining_samples);
} }
// Silence detection: check if all samples are below threshold
// Threshold: 100 = ~0.3% of max volume (very quiet)
const short silence_threshold = 100;
int total_samples = frame_size * channels;
int is_silence = 1;
for (int i = 0; i < total_samples; i++) {
short abs_sample = pcm_buffer[i] < 0 ? -pcm_buffer[i] : pcm_buffer[i];
if (abs_sample > silence_threshold) {
is_silence = 0;
break;
}
}
// If silence detected, return 0 to skip sending this frame
if (is_silence) {
if (trace_logging_enabled) {
printf("[AUDIO_OUTPUT] jetkvm_audio_read_encode: Silence detected, skipping frame\n");
}
return 0;
}
// Apply 4x gain boost to fix quantization noise on transients at normal volumes to prevent crackling issues
simd_scale_volume_s16(pcm_buffer, frame_size * channels, 4.0f);
int nb_bytes = opus_encode(encoder, pcm_buffer, frame_size, out, max_packet_size); int nb_bytes = opus_encode(encoder, pcm_buffer, frame_size, out, max_packet_size);
if (trace_logging_enabled && nb_bytes > 0) { if (trace_logging_enabled && nb_bytes > 0) {

4
internal/audio/core_config_constants.go
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@ -287,8 +287,8 @@ func DefaultAudioConfig() *AudioConfigConstants {
CGOOpusBitrate: 96000, // 96 kbps optimal for stereo @ 48kHz CGOOpusBitrate: 96000, // 96 kbps optimal for stereo @ 48kHz
CGOOpusComplexity: 1, // Complexity 1: minimal CPU (~0.5% on RV1106) CGOOpusComplexity: 1, // Complexity 1: minimal CPU (~0.5% on RV1106)
CGOOpusVBR: 1, // VBR enabled for efficiency CGOOpusVBR: 1, // VBR enabled for efficiency
CGOOpusVBRConstraint: 0, // Unconstrained VBR: allows bitrate spikes for transients (beeps/sharp sounds) CGOOpusVBRConstraint: 1, // Constrained VBR for predictable bitrate
CGOOpusSignalType: 3002, // OPUS_SIGNAL_MUSIC (better for HDMI audio) CGOOpusSignalType: -1000, // OPUS_AUTO (automatic voice/music detection)
CGOOpusBandwidth: 1103, // OPUS_BANDWIDTH_WIDEBAND (native 48kHz, no resampling) CGOOpusBandwidth: 1103, // OPUS_BANDWIDTH_WIDEBAND (native 48kHz, no resampling)
CGOOpusDTX: 0, // DTX disabled for continuous audio CGOOpusDTX: 0, // DTX disabled for continuous audio
CGOSampleRate: 48000, // 48 kHz native HDMI sample rate CGOSampleRate: 48000, // 48 kHz native HDMI sample rate