get_wav_header(pb, &st->codec, (size >= 18));
get_wav_header(pb, &st->codec, size);
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap){    AVIContext *avi = s->priv_data;    ByteIOContext *pb = &s->pb;    uint32_t tag, tag1;    int codec_type, stream_index, frame_period, bit_rate, scale, rate;    unsigned int size;    int i;    AVStream *st;    /* check RIFF header */    tag = get_le32(pb);    if (tag != MKTAG('R', 'I', 'F', 'F'))        return -1;    get_le32(pb); /* file size */    tag = get_le32(pb);    if (tag != MKTAG('A', 'V', 'I', ' '))        return -1;    /* first list tag */    stream_index = -1;    codec_type = -1;    frame_period = 0;    for(;;) {        if (url_feof(pb))            goto fail;        tag = get_le32(pb);        size = get_le32(pb);#ifdef DEBUG        print_tag("tag", tag, size);#endif        switch(tag) {        case MKTAG('L', 'I', 'S', 'T'):            /* ignored, except when start of video packets */            tag1 = get_le32(pb);#ifdef DEBUG            print_tag("list", tag1, 0);#endif            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {                avi->movi_end = url_ftell(pb) + size - 4;#ifdef DEBUG                printf("movi end=%Lx\n", avi->movi_end);#endif                goto end_of_header;            }            break;        case MKTAG('a', 'v', 'i', 'h'):	    /* avi header */            /* using frame_period is bad idea */            frame_period = get_le32(pb);            bit_rate = get_le32(pb) * 8;	    url_fskip(pb, 4 * 4);            s->nb_streams = get_le32(pb);            for(i=0;i<s->nb_streams;i++) {                AVStream *st = av_mallocz(sizeof(AVStream));                if (!st)                    goto fail;                avcodec_get_context_defaults(&st->codec);                s->streams[i] = st;	    }            url_fskip(pb, size - 7 * 4);            break;        case MKTAG('s', 't', 'r', 'h'):            /* stream header */            stream_index++;            tag1 = get_le32(pb);            switch(tag1) {            case MKTAG('v', 'i', 'd', 's'):                codec_type = CODEC_TYPE_VIDEO;                if (stream_index >= s->nb_streams) {                    url_fskip(pb, size - 4);                    break;                }                 st = s->streams[stream_index];                get_le32(pb); /* codec tag */                get_le32(pb); /* flags */                get_le16(pb); /* priority */                get_le16(pb); /* language */                get_le32(pb); /* XXX: initial frame ? */                scale= get_le32(pb); /* scale */                rate= get_le32(pb); /* rate */                if(scale && rate)                    st->codec.frame_rate= (rate * (uint64_t)FRAME_RATE_BASE + scale/2) / scale;                else if(frame_period)                    st->codec.frame_rate = (1000000LL * FRAME_RATE_BASE + frame_period/2) / frame_period;                else                    st->codec.frame_rate = 25 * FRAME_RATE_BASE;                                url_fskip(pb, size - 7 * 4);                break;            case MKTAG('a', 'u', 'd', 's'):                codec_type = CODEC_TYPE_AUDIO;                /* nothing really useful */                url_fskip(pb, size - 4);                break;            default:                goto fail;            }            break;        case MKTAG('s', 't', 'r', 'f'):            /* stream header */            if (stream_index >= s->nb_streams) {                url_fskip(pb, size);            } else {                st = s->streams[stream_index];                switch(codec_type) {                case CODEC_TYPE_VIDEO:                    get_le32(pb); /* size */                    st->codec.width = get_le32(pb);                    st->codec.height = get_le32(pb);                    get_le16(pb); /* panes */                    st->codec.bits_per_sample= get_le16(pb); /* depth */                    tag1 = get_le32(pb);                    get_le32(pb); /* ImageSize */                    get_le32(pb); /* XPelsPerMeter */                    get_le32(pb); /* YPelsPerMeter */                    get_le32(pb); /* ClrUsed */                    get_le32(pb); /* ClrImportant */                    st->codec.extradata_size= size - 10*4;                    st->codec.extradata= av_malloc(st->codec.extradata_size); //FIXME where should we free this?                    get_buffer(pb, st->codec.extradata, st->codec.extradata_size);                                        if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly                        get_byte(pb);#ifdef DEBUG                    print_tag("video", tag1, 0);#endif                    st->codec.codec_type = CODEC_TYPE_VIDEO;                    st->codec.codec_tag = tag1;                    st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);//                    url_fskip(pb, size - 5 * 4);                    break;                case CODEC_TYPE_AUDIO:                    get_wav_header(pb, &st->codec, (size >= 18));                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */                        url_fskip(pb, 1);                    break;                default:                    url_fskip(pb, size);                    break;                }            }            break;        default:            /* skip tag */            size += (size & 1);            url_fskip(pb, size);            break;        }    } end_of_header:    /* check stream number */    if (stream_index != s->nb_streams - 1) {    fail:        for(i=0;i<s->nb_streams;i++) {            av_freep(&s->streams[i]->codec.extradata);            av_freep(&s->streams[i]);        }        return -1;    }    return 0;}