if(track->enc->codec_id == CODEC_ID_AAC) mov_write_esds_tag(pb, track);
static int mov_write_audio_tag(ByteIOContext *pb, MOVTrack* track){    int pos = url_ftell(pb);    put_be32(pb, 0); /* size */    if(track->enc->codec_id == CODEC_ID_PCM_MULAW)      put_tag(pb, "ulaw");    else if(track->enc->codec_id == CODEC_ID_PCM_ALAW)      put_tag(pb, "alaw");    else if(track->enc->codec_id == CODEC_ID_ADPCM_IMA_QT)      put_tag(pb, "ima4");    else if(track->enc->codec_id == CODEC_ID_MACE3)      put_tag(pb, "MAC3");    else if(track->enc->codec_id == CODEC_ID_MACE6)      put_tag(pb, "MAC6");    else if(track->enc->codec_id == CODEC_ID_AAC)      put_tag(pb, "mp4a");    else if(track->enc->codec_id == CODEC_ID_AMR_NB)      put_tag(pb, "samr");    else      put_tag(pb, "    ");    put_be32(pb, 0); /* Reserved */    put_be16(pb, 0); /* Reserved */    put_be16(pb, 1); /* Data-reference index, XXX  == 1 */    put_be32(pb, 0); /* Reserved */    put_be32(pb, 0); /* Reserved */    put_be16(pb, track->enc->channels); /* Number of channels */    /* TODO: Currently hard-coded to 16-bit, there doesn't seem	         to be a good way to get number of bits of audio */    put_be16(pb, 0x10); /* Reserved */    put_be16(pb, 0); /* compression ID (= 0) */    put_be16(pb, 0); /* packet size (= 0) */    put_be16(pb, track->timescale); /* Time scale */    put_be16(pb, 0); /* Reserved */    if(track->enc->codec_id == CODEC_ID_AMR_NB)        mov_write_damr_tag(pb);    return updateSize (pb, pos);}