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