Function aiff_read_header

libavformat/aiffdec.c:225–424

aiff input */

/* aiff input */
static int aiff_read_header(AVFormatContext *s)
{
    int ret;
    int64_t filesize, size;
    int64_t offset = 0, position;
    uint32_t tag;
    unsigned version = AIFF_C_VERSION1;
    AVIOContext *pb = s->pb;
    AVStream * st;
    AIFFInputContext *aiff = s->priv_data;
    ID3v2ExtraMeta *id3v2_extra_meta;

    /* check FORM header */
    filesize = get_tag(pb, &tag);
    if (filesize < 4 || tag != MKTAG('F', 'O', 'R', 'M'))
        return AVERROR_INVALIDDATA;

    /* AIFF data type */
    tag = avio_rl32(pb);
    if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */
        version = AIFF;
    else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */
        return AVERROR_INVALIDDATA;

    filesize -= 4;

    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);

    while (filesize > 0) {
        /* parse different chunks */
        size = get_tag(pb, &tag);

        if (size == AVERROR_EOF && offset > 0 && st->codecpar->block_align) {
            av_log(s, AV_LOG_WARNING, "header parser hit EOF\n");
            goto got_sound;
        }
        if (size < 0)
            return size;

        filesize -= size + 8;

        switch (tag) {
        case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */
            /* Then for the complete header info */
            st->nb_frames = get_aiff_header(s, size, version);
            if (st->nb_frames < 0)
                return st->nb_frames;
            if (offset > 0) // COMM is after SSND
                goto got_sound;
            break;
        case MKTAG('I', 'D', '3', ' '):
            position = avio_tell(pb);
            ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
            if (id3v2_extra_meta)
                if ((ret = ff_id3v2_parse_apic(s, id3v2_extra_meta)) < 0 ||
                    (ret = ff_id3v2_parse_chapters(s, id3v2_extra_meta)) < 0) {