Enhanced hdc #245
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Enhanced hdc #245
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Align the core and enhanced streams based on the PDU sequence number. But, seq is limited to 6 bits so we need to manually adjust by 64 for some reason.
SBR needs to be fixed when it switches from mono to stereo, etc. Easiest solution is to completely reset it, but this could be improved.
Defaults to core-only. Use --enhanced to decode enhanced stream. This is not for public consumption, only to ease testing.
argilo
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Sep 5, 2020
| @@ -542,7 +543,8 @@ void frame_process(frame_t *st, size_t length) | |||
| } | |||
| else | |||
| { | |||
| input_pdu_push(st->input, st->buffer + offset, cnt, prog, hdr.stream_id); | |||
| input_pdu_push(st->input, st->buffer + offset, cnt, prog, hdr.stream_id, seq); | |||
| seq = (seq + 1) & 0x3f; | |||
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The sequence number also needs to be incremented in the case where the CRC is invalid. This line won't be reached due to the continue on line 523.
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Fair point. Looking over this code, I feel like there are similar problems with st->pdu_idx[prog][hdr.stream_id] as well, so some refactoring might be warranted.
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Yes, you're right. We should reset st->pdu_idx[prog][hdr.stream_id] back to zero in the j == 0 && hdr.pfirst case, regardless of whether the CRC is valid.
This was referenced May 5, 2024
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Do not merge.
This is a first draft of the enhanced stream support for AM. I would like more test data but I neither have a way to record AM nor am I in the right country currently.
My testing so far has been the AM sample that was provided a while ago. The converted form that works with nrsc5 can be found here: https://gofile.io/d/lQuUUN.
For testing, there is a CLI switch (--enhanced) that controls whether the core stream will be decoded (default) or core+enhanced. This would go away before this pull request is accepted.