Function write_stream_codec_info

libavformat/wtvenc.c:260–316

}

static int write_stream_codec_info(AVFormatContext *s, AVStream *st)
{
    const ff_asf_guid *g, *media_type, *format_type;
    const AVCodecTag *tags;
    AVIOContext *pb = s->pb;
    int64_t  hdr_pos_start;
    int hdr_size = 0;

    if (st->codecpar->codec_type  == AVMEDIA_TYPE_VIDEO) {
        g = ff_get_codec_guid(st->codecpar->codec_id, ff_video_guids);
        media_type = &ff_mediatype_video;
        format_type = st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO ? &ff_format_mpeg2_video : &ff_format_videoinfo2;
        tags = ff_codec_bmp_tags;
    } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
        g = ff_get_codec_guid(st->codecpar->codec_id, ff_codec_wav_guids);
        media_type = &ff_mediatype_audio;
        format_type = &ff_format_waveformatex;
        tags = ff_codec_wav_tags;
    } else {
        av_log(s, AV_LOG_ERROR, "unknown codec_type (0x%x)\n", st->codecpar->codec_type);
        return -1;
    }

    ff_put_guid(pb, media_type); // mediatype
    ff_put_guid(pb, &ff_mediasubtype_cpfilters_processed); // subtype
    write_pad(pb, 12);
    ff_put_guid(pb,&ff_format_cpfilters_processed); // format type
    avio_wl32(pb, 0); // size

    hdr_pos_start = avio_tell(pb);
    if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
        put_videoinfoheader2(pb, st);
    } else {
        if (ff_put_wav_header(s, pb, st->codecpar, 0) < 0)
            format_type = &ff_format_none;
    }
    hdr_size = avio_tell(pb) - hdr_pos_start;

    // seek back write hdr_size
    avio_seek(pb, -(hdr_size + 4), SEEK_CUR);
    avio_wl32(pb, hdr_size + 32);
    avio_seek(pb, hdr_size, SEEK_CUR);
    if (g) {
        ff_put_guid(pb, g);           // actual_subtype
    } else {
        int tag = ff_codec_get_tag(tags, st->codecpar->codec_id);
        if (!tag) {
            av_log(s, AV_LOG_ERROR, "unsupported codec_id (0x%x)\n", st->codecpar->codec_id);
            return -1;
        }
        avio_wl32(pb, tag);
        avio_write(pb, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12);
    }
    ff_put_guid(pb, format_type); // actual_formattype

    return 0;
}