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kvm
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37 Commits

Author SHA1 Message Date
Alex P 6728c492a1 feat: Optimize audio quality and default to USB audio 
Audio quality improvements:
- Enable constrained VBR to prevent bitrate starvation at low volumes
- Increase Opus complexity from 2 to 5 for better quality
- Enable DTX for bandwidth optimization
- Enable FEC (Forward Error Correction)
- Add DTX and FEC signaling in SDP (usedtx=1;useinbandfec=1)

Default configuration changes:
- Change default audio output source from HDMI to USB
- Enable USB Audio device by default
- USB audio works on current stable image (HDMI requires newer device tree)

These changes fix crackling issues at low volumes and provide better
overall audio quality for both USB and HDMI audio paths.
 2025-10-07 01:38:42 +03:00
Alex P 3b609d2b67 refactor: Simplify audio implementation 
Remove dynamic gain code and rely on Opus encoder quality improvements:
- Increase Opus complexity from 2 to 5 for better quality
- Change bandwidth from FULLBAND (20kHz) to SUPERWIDEBAND (16kHz) for better quality at 128kbps
- Disable FEC to allocate all bits to audio quality
- Increase ALSA buffer from 40ms to 80ms for stability

The dynamic gain code was adding complexity without solving the underlying
issue: TC358743 HDMI chip captures digital audio at whatever volume the
source outputs. Users should adjust volume at the source or in their browser.
 2025-10-07 00:25:45 +03:00
Alex P 639eecbb93 fix: Add noise gate to prevent amplifying silence artifacts 
Add noise gate threshold at peak > 256 (-42dB) to prevent dynamic gain
from amplifying quantization noise and hardware noise floor. This fixes
crackling, buzzing, and static-like noise when HDMI audio is at very
low volume or during silence.

Without the gate, signals below -42dB (peak < 256) would get 8x gain
applied, amplifying noise floor to audible levels. Now these signals
pass through unmodified, eliminating the artifacts.
 2025-10-06 22:23:23 +03:00
Alex P 78c3dc3a1e Refactor: Simplify / rewrite Audio 2025-10-06 21:59:44 +03:00
Alex P 2aa07e3860 [WIP] Updates: reduce PR complexity 2025-10-02 00:08:42 +03:00
Alex P c2d343b0dc [WIP] Updates: reduce PR complexity 2025-10-01 22:54:37 +03:00
Alex P b1b64fc8d2 [WIP] Updates: use native C binaries for audio 2025-10-01 20:13:13 +03:00
Alex P 51a8ed958d Cleanup: remove silence detection 2025-09-30 14:32:36 +00:00
Alex P 186f3cfbe0 [WIP] Cleanup: cleanup audio code after HDMI switch 2025-09-30 13:32:56 +00:00
Alex P 11830e1123 [WIP] Fix: crackling sound when seeking forward after migrating to HDMI Audio 2025-09-30 13:14:15 +00:00
Alex P a0685877bc [WIP] Fix: crackling sound when seeking forwars 2025-09-30 13:11:16 +00:00
Alex P 5d24eba58e [WIP] Fix: crackling sound when seeking forwars 2025-09-30 12:58:49 +00:00
Alex P f891f14152 [WIP] Updates: simplify audio system 2025-09-30 12:36:41 +00:00
Alex P 918cdba0b7 Updates: adjust gain to avoid audio artifacts 2025-09-30 12:05:03 +00:00
Alex P 4afaf6023a [WIP] Updates: simplify audio system 2025-09-30 11:41:17 +00:00
Alex P 06399820c4 [WIP] Updates: simplify audio system 2025-09-30 11:03:34 +00:00
Alex P d015542088 [WIP] Updates: simplify audio system 2025-09-30 09:36:19 +00:00
Alex P c8401cc483 [WIP] Updates: simplify audio system 2025-09-30 09:04:07 +00:00
Alex P bf50669e3a perf(audio): add ARM NEON SIMD optimizations for audio processing 
Implement SIMD-optimized audio operations using ARM NEON for Cortex-A7 targets
Update Makefile and CI configuration to support NEON compilation flags
Add SIMD implementations for common audio operations including:
- Sample clearing and interleaving
- Volume scaling and format conversion
- Channel manipulation and balance adjustment
- Endianness swapping and prefetching
 2025-09-16 18:18:19 +00:00
Alex P c6951fc57e PR Review Optimization: As recommended, use ternary operators instead of if/else for better readability 2025-09-16 16:17:56 +03:00
Alex P b9733566bc Consistency: keep if block multi-line 2025-09-16 16:08:16 +03:00
Alex P b03a9f1171 Fix: remove misplaced const 2025-09-16 15:52:53 +03:00
Alex P fe19379ef1 Cleanup, Optimizations: Small aaudio optimizations 2025-09-16 15:46:55 +03:00
Alex P 7615b5c3ef Cleanup, Optimizations: Small aaudio optimizations 2025-09-16 15:45:03 +03:00
Alex P ab6a918219 Cleanup, Optimizations: Small aaudio optimizations 2025-09-16 15:37:23 +03:00
Alex P 6d2b8e585a Cleanup: removed redundant code, comments, etc. 2025-09-16 15:31:10 +03:00
Alex P 410f10ff39 [WIP] Maintainability Improvement: Add debug logging throughout the audio system for easy debugging and troubleshooting 2025-09-16 15:05:08 +03:00
Alex P bbeeaf2a00 [WIP] Maintainability Improvement: Add debug logging throughout the audio system for easy debugging and troubleshooting 2025-09-16 11:27:18 +03:00
Alex P 21d7c87fc7 [WIP] Add debug logging throughout the audio system 2025-09-16 11:26:48 +03:00
Alex P 53b5a0a90c [WIP] Maintainability: Add debug / trace logs to make it easy to debug audio input issues 2025-09-16 11:11:18 +03:00
Alex P 1d275099d2 [WIP] Cleanup: function naming 2025-09-16 07:33:34 +00:00
Alex P 1fca01c64d [WIP] Cleanup: remove unnecessary complexity 2025-09-15 23:00:03 +00:00
Alex P 48c62c5912 Fix: pcm_snd_wait won't work when device is busy 2025-09-16 00:32:19 +03:00
Alex P 97b2fe0c32 [WIP] Optimizations: Optimize audio system 2025-09-15 21:22:02 +00:00
Alex P 7b3a8ccb95 Fix: indentation 2025-09-15 14:29:02 +03:00
Alex P a8b0a33116 [WIP] Cleanup / Refinement: PR Review 2025-09-14 21:55:31 +00:00
Alex P 59b75116f0 Improvement (Maintainability): Make all C code more manageable by moving it to its own dedicated file 2025-09-11 13:27:10 +03:00