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Code Issues Releases Wiki Activity

Fix bug: alsa+ffmpeg use different channel layout.

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This commit is contained in:
Johns 2012-02-07 17:08:59 +01:00
parent 947f6b312e
commit 09cf1f5c85
2 changed files with 63 additions and 0 deletions
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1
ChangeLog
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@ -1,6 +1,7 @@
User johns
Date:
Fix bug: alsa and ffmpeg use different channel layout.
Support more LPCM sample rates and number of channels.
Quick&dirty support for mpeg LPCM streams.
Workaround for text2skin undrawn OSD areas.

62
codec.c
View File

@ -739,6 +739,62 @@ void CodecSetAudioPassthrough(int mask)
(void)mask;
}
/**
** Reorder audio frame.
**
** ffmpeg L R C Ls Rs -> alsa L R Ls Rs C
** ffmpeg L R C LFE Ls Rs -> alsa L R Ls Rs C LFE
** ffmpeg L R C LFE Ls Rs Rl Rr -> alsa L R Ls Rs C LFE Rl Rr
*/
static void CodecReorderAudioFrame(int16_t * buf, int size, int channels)
{
int i;
int c;
int ls;
int rs;
int lfe;
switch (channels) {
case 5:
size /= 2;
for (i = 0; i < size; i += 5) {
c = buf[i + 2];
ls = buf[i + 3];
rs = buf[i + 4];
buf[i + 2] = ls;
buf[i + 3] = rs;
buf[i + 4] = c;
}
break;
case 6:
size /= 2;
for (i = 0; i < size; i += 6) {
c = buf[i + 2];
ls = buf[i + 3];
rs = buf[i + 4];
lfe = buf[i + 5];
buf[i + 2] = ls;
buf[i + 3] = rs;
buf[i + 4] = c;
buf[i + 5] = lfe;
}
break;
case 8:
size /= 2;
for (i = 0; i < size; i += 8) {
c = buf[i + 2];
ls = buf[i + 3];
rs = buf[i + 4];
lfe = buf[i + 5];
buf[i + 2] = ls;
buf[i + 3] = rs;
buf[i + 4] = c;
buf[i + 5] = lfe;
}
break;
}
}
#ifdef USE_AVPARSER
/**
@ -817,6 +873,8 @@ void CodecAudioDecode(AudioDecoder * audio_decoder, const AVPacket * avpkt)
int err;
int isAC3;
// FIXME: use swr_convert from swresample
// FIXME: tell ac3 decoder to use downmix
if (audio_decoder->ReSample) {
audio_resample_close(audio_decoder->ReSample);
audio_decoder->ReSample = NULL;
@ -893,6 +951,8 @@ void CodecAudioDecode(AudioDecoder * audio_decoder, const AVPacket * avpkt)
audio_decoder->HwChannels *
av_get_bytes_per_sample(audio_ctx->sample_fmt);
Debug(4, "codec/audio: %d -> %d\n", buf_sz, outlen);
CodecReorderAudioFrame(outbuf, outlen,
audio_decoder->HwChannels);
AudioEnqueue(outbuf, outlen);
}
} else {
@ -971,6 +1031,8 @@ void CodecAudioDecode(AudioDecoder * audio_decoder, const AVPacket * avpkt)
// True HD?
#endif
#endif
CodecReorderAudioFrame(buf, buf_sz,
audio_decoder->HwChannels);
AudioEnqueue(buf, buf_sz);
}
}