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int ff_mp4_read_descr_len(AVIOContext *pb);
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int ff_mp4_read_descr(AVFormatContext *fc, AVIOContext *pb, int *tag);
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int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext *pb);
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#define MP4IODescrTag 0x02
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#define MP4ESDescrTag 0x03
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#define MP4DecConfigDescrTag 0x04
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#define MP4DecSpecificDescrTag 0x05
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int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb, MOVAtom atom);
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enum CodecID ff_mov_get_lpcm_codec_id(int bps, int flags);