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tools: add audio_fix.py — Deltacast audio Mode/BufferFormat fix

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Zac Gaetano 2026-06-01 22:01:16 -04:00
parent 4d1b23959c
commit 6908801822
1 changed files with 49 additions and 0 deletions
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tools/audio_fix.py Normal file
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"""Patches deltacast-bridge audio_thread to follow SDK Sample_RXAudio.cpp:
- Set Mode/BufferFormat on BOTH pAudioChannels[0] AND [1] (stereo pair)
- Get/Set VHD_SDI_SP_INTERFACE on the audio stream
Without these, VHD_SlotExtractAudio returns 0 samples (silent capture)."""
path = 'services/capture/deltacast-bridge/main.c'
with open(path) as f:
s = f.read()
old = """ ULONG r = VHD_OpenStreamHandle(ps->board, rx_streamtype(ps->port),
VHD_SDI_STPROC_DISJOINED_ANC,
NULL, &stream, NULL);
if (r == VHDERR_NOERROR) {
VHD_SetStreamProperty(stream, VHD_SDI_SP_VIDEO_STANDARD, ps->video_std);
VHD_SetStreamProperty(stream, VHD_SDI_SP_CLOCK_SYSTEM, ps->clock_div);
VHD_SetStreamProperty(stream, VHD_CORE_SP_TRANSFER_SCHEME, VHD_TRANSFER_SLAVED);
ai.pAudioGroups[0].pAudioChannels[0].Mode = VHD_AM_STEREO;
ai.pAudioGroups[0].pAudioChannels[0].BufferFormat = VHD_AF_16;
ai.pAudioGroups[0].pAudioChannels[0].pData = buf;"""
new = """ ULONG r = VHD_OpenStreamHandle(ps->board, rx_streamtype(ps->port),
VHD_SDI_STPROC_DISJOINED_ANC,
NULL, &stream, NULL);
if (r == VHDERR_NOERROR) {
/* Per Deltacast SDK Sample_RXAudio.cpp: VHD_SDI_SP_INTERFACE must be
* propagated to the audio stream, otherwise VHD_SlotExtractAudio
* returns 0 samples (silent capture). */
ULONG iface = 0;
VHD_GetStreamProperty(stream, VHD_SDI_SP_INTERFACE, &iface);
VHD_SetStreamProperty(stream, VHD_SDI_SP_VIDEO_STANDARD, ps->video_std);
VHD_SetStreamProperty(stream, VHD_SDI_SP_CLOCK_SYSTEM, ps->clock_div);
VHD_SetStreamProperty(stream, VHD_CORE_SP_TRANSFER_SCHEME, VHD_TRANSFER_SLAVED);
VHD_SetStreamProperty(stream, VHD_SDI_SP_INTERFACE, iface);
/* Configure BOTH channels of the stereo pair (group 0). The actual PCM
* samples land in pAudioChannels[0].pData (packed L/R s16le). Channel
* [1] must declare Mode+BufferFormat so the SDK recognizes the pair. */
ai.pAudioGroups[0].pAudioChannels[0].Mode = VHD_AM_STEREO;
ai.pAudioGroups[0].pAudioChannels[0].BufferFormat = VHD_AF_16;
ai.pAudioGroups[0].pAudioChannels[0].pData = buf;
ai.pAudioGroups[0].pAudioChannels[1].Mode = VHD_AM_STEREO;
ai.pAudioGroups[0].pAudioChannels[1].BufferFormat = VHD_AF_16;"""
assert old in s, 'Old block not found'
s = s.replace(old, new, 1)
with open(path, 'w') as f:
f.write(s)
print('PATCHED OK')