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set alac channels from extradata, fix alac mono in m4a
Originally committed as revision 16212 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -1033,8 +1033,10 @@ static int mov_read_stsd(MOVContext *c, ByteIOContext *pb, MOVAtom atom)
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st->codec->block_align = sc->bytes_per_frame;
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break;
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case CODEC_ID_ALAC:
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if (st->codec->extradata_size == 36)
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if (st->codec->extradata_size == 36) {
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st->codec->frame_size = AV_RB32((st->codec->extradata+12));
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st->codec->channels = AV_RB8 (st->codec->extradata+21);
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}
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break;
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default:
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break;
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