vc1.c

        /* special case for last picture */
        if (s->low_delay==0 && s->next_picture_ptr) {
            *pict= *(AVFrame*)s->next_picture_ptr;
            s->next_picture_ptr= NULL;

            *data_size = sizeof(AVFrame);
        }

        return 0;
    }

    /* We need to set current_picture_ptr before reading the header,
     * otherwise we cannot store anything in there. */
    if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
        int i= ff_find_unused_picture(s, 0);
        s->current_picture_ptr= &s->picture[i];
    }

    //for advanced profile we may need to parse and unescape data
    if (avctx->codec_id == CODEC_ID_VC1) {
        int buf_size2 = 0;
        buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

        if(IS_MARKER(AV_RB32(buf))){ /* frame starts with marker and needs to be parsed */
            uint8_t *start, *end, *next;
            int size;

            next = buf;
            for(start = buf, end = buf + buf_size; next < end; start = next){
                next = find_next_marker(start + 4, end);
                size = next - start - 4;
                if(size <= 0) continue;
                switch(AV_RB32(start)){
                case VC1_CODE_FRAME:
                    buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);
                    break;
                case VC1_CODE_ENTRYPOINT: /* it should be before frame data */
                    buf_size2 = vc1_unescape_buffer(start + 4, size, buf2);
                    init_get_bits(&s->gb, buf2, buf_size2*8);
                    decode_entry_point(avctx, &s->gb);
                    break;
                case VC1_CODE_SLICE:
                    av_log(avctx, AV_LOG_ERROR, "Sliced decoding is not implemented (yet)\n");
                    av_free(buf2);
                    return -1;
                }
            }
        }else if(v->interlace && ((buf[0] & 0xC0) == 0xC0)){ /* WVC1 interlaced stores both fields divided by marker */
            uint8_t *divider;

            divider = find_next_marker(buf, buf + buf_size);
            if((divider == (buf + buf_size)) || AV_RB32(divider) != VC1_CODE_FIELD){
                av_log(avctx, AV_LOG_ERROR, "Error in WVC1 interlaced frame\n");
                return -1;
            }

            buf_size2 = vc1_unescape_buffer(buf, divider - buf, buf2);
            // TODO
            av_free(buf2);return -1;
        }else{
            buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);
        }
        init_get_bits(&s->gb, buf2, buf_size2*8);
    } else
        init_get_bits(&s->gb, buf, buf_size*8);
    // do parse frame header
    if(v->profile < PROFILE_ADVANCED) {
        if(vc1_parse_frame_header(v, &s->gb) == -1) {
            av_free(buf2);
            return -1;
        }
    } else {
        if(vc1_parse_frame_header_adv(v, &s->gb) == -1) {
            av_free(buf2);
            return -1;
        }
    }

    if(s->pict_type != I_TYPE && !v->res_rtm_flag){
        av_free(buf2);
        return -1;
    }

    // for hurry_up==5
    s->current_picture.pict_type= s->pict_type;
    s->current_picture.key_frame= s->pict_type == I_TYPE;

    /* skip B-frames if we don't have reference frames */
    if(s->last_picture_ptr==NULL && (s->pict_type==B_TYPE || s->dropable)){
        av_free(buf2);
        return -1;//buf_size;
    }
    /* skip b frames if we are in a hurry */
    if(avctx->hurry_up && s->pict_type==B_TYPE) return -1;//buf_size;
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)
       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)
       ||  avctx->skip_frame >= AVDISCARD_ALL) {
        av_free(buf2);
        return buf_size;
    }
    /* skip everything if we are in a hurry>=5 */
    if(avctx->hurry_up>=5) {
        av_free(buf2);
        return -1;//buf_size;
    }

    if(s->next_p_frame_damaged){
        if(s->pict_type==B_TYPE)
            return buf_size;
        else
            s->next_p_frame_damaged=0;
    }

    if(MPV_frame_start(s, avctx) < 0) {
        av_free(buf2);
        return -1;
    }

    ff_er_frame_start(s);

    v->bits = buf_size * 8;
    vc1_decode_blocks(v);
//av_log(s->avctx, AV_LOG_INFO, "Consumed %i/%i bits\n", get_bits_count(&s->gb), buf_size*8);
//  if(get_bits_count(&s->gb) > buf_size * 8)
//      return -1;
    ff_er_frame_end(s);

    MPV_frame_end(s);

assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
assert(s->current_picture.pict_type == s->pict_type);
    if (s->pict_type == B_TYPE || s->low_delay) {
        *pict= *(AVFrame*)s->current_picture_ptr;
    } else if (s->last_picture_ptr != NULL) {
        *pict= *(AVFrame*)s->last_picture_ptr;
    }

    if(s->last_picture_ptr || s->low_delay){
        *data_size = sizeof(AVFrame);
        ff_print_debug_info(s, pict);
    }

    /* Return the Picture timestamp as the frame number */
    /* we substract 1 because it is added on utils.c    */
    avctx->frame_number = s->picture_number - 1;

    av_free(buf2);
    return buf_size;
}


/** Close a VC1/WMV3 decoder
 * @warning Initial try at using MpegEncContext stuff
 */
static int vc1_decode_end(AVCodecContext *avctx)
{
    VC1Context *v = avctx->priv_data;

    av_freep(&v->hrd_rate);
    av_freep(&v->hrd_buffer);
    MPV_common_end(&v->s);
    av_freep(&v->mv_type_mb_plane);
    av_freep(&v->direct_mb_plane);
    av_freep(&v->acpred_plane);
    av_freep(&v->over_flags_plane);
    av_freep(&v->mb_type_base);
    return 0;
}


AVCodec vc1_decoder = {
    "vc1",
    CODEC_TYPE_VIDEO,
    CODEC_ID_VC1,
    sizeof(VC1Context),
    vc1_decode_init,
    NULL,
    vc1_decode_end,
    vc1_decode_frame,
    CODEC_CAP_DELAY,
    NULL
};

AVCodec wmv3_decoder = {
    "wmv3",
    CODEC_TYPE_VIDEO,
    CODEC_ID_WMV3,
    sizeof(VC1Context),
    vc1_decode_init,
    NULL,
    vc1_decode_end,
    vc1_decode_frame,
    CODEC_CAP_DELAY,
    NULL
};