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activate SBR mode in AAC

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This commit is contained in:
Philippe G
2021-04-07 00:45:21 -07:00
parent 3a2bfe470f
commit cac6306a04
1 changed files with 8 additions and 4 deletions
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12
components/squeezelite/helix-aac.c
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@@ -151,14 +151,18 @@ static int read_mp4_header(unsigned long *samplerate_p, unsigned char *channels_
LOG_WARN("error parsing esds");
return -1;
}
mp4_desc_length(&ptr);
int desc_len = mp4_desc_length(&ptr);
info.profile = *ptr >> 3;
info.sampRateCore = (*ptr++ & 0x07) << 1;
info.sampRateCore |= (*ptr >> 7) & 0x01;
info.sampRateCore = rates[info.sampRateCore];
info.nChans = (*ptr & 0x7f) >> 3;
*channels_p = info.nChans;
info.sampRateCore = rates[info.sampRateCore];
info.nChans = (*ptr++ & 0x7f) >> 3;
*channels_p = info.nChans;
*samplerate_p = info.sampRateCore;
if (desc_len > 2 && ((ptr[0] << 3) | (ptr[1] >> 5)) == 0x2b7 && (ptr[1] & 0x1f) == 0x05 && (ptr[2] & 0x80)) {
LOG_WARN("AAC SBR mode activated => high CPU consumption (please proxy)");
*samplerate_p = rates[(ptr[2] & 0x78) >> 3];
}
HAAC(a, SetRawBlockParams, a->hAac, 0, &info);
LOG_DEBUG("playable aac track: %u (p:%x, r:%d, c:%d)", trak, info.profile, info.sampRateCore, info.nChans);
play = trak;