WildDragonLLC/dragonflight
1
0
Fork 0
Code Issues 32 Pull requests 1 Projects Releases Packages Wiki Activity Actions

fix(bridge): JOINED audio needs BOTH stereo channels declared (fixes -91dB silence)

Browse source 
VHD_SlotExtractAudio on the JOINED slot returned -91dB silence when only
pAudioChannels[0] was declared. On this card/SDK declaring BOTH channel[0] and
channel[1] of the stereo pair makes the SDK land real PCM. Verified -13.3dB
audible against the live SDI source (was -91dB).
This commit is contained in:
OpenCode 2026-06-05 14:12:23 +00:00
parent 97267aa857
commit f5566cbb81
1 changed files with 9 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
services/capture/deltacast-bridge/main.c
View file

@ -474,7 +474,15 @@ static void audio_extract_init(AudioExtract *ax, PortState *ps) {
ax->ai.pAudioGroups[0].pAudioChannels[0].Mode = VHD_AM_STEREO;
ax->ai.pAudioGroups[0].pAudioChannels[0].BufferFormat = VHD_AF_16;
ax->ai.pAudioGroups[0].pAudioChannels[0].pData = ax->buf;
/* pAudioChannels[1] intentionally left zeroed (memset above). */
/* BOTH channels of the stereo pair MUST be declared (Mode+BufferFormat) for
* VHD_SlotExtractAudio to return samples on THIS card/SDK. Configuring only
* channel[0] (per the upstream FFmpeg fork's pattern) yielded -91dB silence
* here; declaring channel[1] too — matching the proven DISJOINED_ANC config
* that extracted real audio — makes the SDK land real PCM (verified -13.3dB
* against the live source). The interleaved L/R s16le still lands in
* channel[0].pData; channel[1] just needs its descriptor present. */
ax->ai.pAudioGroups[0].pAudioChannels[1].Mode = VHD_AM_STEREO;
ax->ai.pAudioGroups[0].pAudioChannels[1].BufferFormat = VHD_AF_16;
ax->enabled = 1;
}