static int raw_decode(AVCodecContext *avctx,
                            void *data, int *data_size,
                            AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    int linesize_align = 4;
    RawVideoContext *context = avctx->priv_data;

    AVFrame * frame = (AVFrame *) data;
    AVPicture * picture = (AVPicture *) data;

    frame->pict_type        = avctx->coded_frame->pict_type;
    frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
    frame->top_field_first = avctx->coded_frame->top_field_first;
    frame->reordered_opaque = avctx->reordered_opaque;
    frame->pkt_pts          = avctx->pkt->pts;
    frame->pkt_pos          = avctx->pkt->pos;

    if(context->tff>=0){
        frame->interlaced_frame = 1;
        frame->top_field_first  = context->tff;
    }

    //2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
    if (context->buffer) {
        int i;
        uint8_t *dst = context->buffer;
        buf_size = context->length - 256*4;
        if (avctx->bits_per_coded_sample == 4){
            for(i=0; 2*i+1 < buf_size; i++){
                dst[2*i+0]= buf[i]>>4;
                dst[2*i+1]= buf[i]&15;
            }
            linesize_align = 8;
        } else {
            for(i=0; 4*i+3 < buf_size; i++){
                dst[4*i+0]= buf[i]>>6;
                dst[4*i+1]= buf[i]>>4&3;
                dst[4*i+2]= buf[i]>>2&3;
                dst[4*i+3]= buf[i]   &3;
            }
            linesize_align = 16;
        }
        buf= dst;
    }

    if(avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
       avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
        buf += buf_size - context->length;

    if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
        return -1;

    avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
    if((avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length) ||
       (av_pix_fmt_descriptors[avctx->pix_fmt].flags & PIX_FMT_PSEUDOPAL)) {
        frame->data[1]= context->palette;
    }
    if (avctx->pix_fmt == PIX_FMT_PAL8) {
        const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);

        if (pal) {
            memcpy(frame->data[1], pal, AVPALETTE_SIZE);
            frame->palette_has_changed = 1;
        }
    }
    if((avctx->pix_fmt==PIX_FMT_BGR24    ||
        avctx->pix_fmt==PIX_FMT_GRAY8    ||
        avctx->pix_fmt==PIX_FMT_RGB555LE ||
        avctx->pix_fmt==PIX_FMT_RGB555BE ||
        avctx->pix_fmt==PIX_FMT_RGB565LE ||
        avctx->pix_fmt==PIX_FMT_MONOWHITE ||
        avctx->pix_fmt==PIX_FMT_PAL8) &&
        FFALIGN(frame->linesize[0], linesize_align)*avctx->height <= buf_size)
        frame->linesize[0] = FFALIGN(frame->linesize[0], linesize_align);

    if(context->flip)
        flip(avctx, picture);

    if (   avctx->codec_tag == MKTAG('Y', 'V', '1', '2')
        || avctx->codec_tag == MKTAG('Y', 'V', '1', '6')
        || avctx->codec_tag == MKTAG('Y', 'V', '2', '4')
        || avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
        FFSWAP(uint8_t *, picture->data[1], picture->data[2]);

    if(avctx->codec_tag == AV_RL32("yuv2") &&
       avctx->pix_fmt   == PIX_FMT_YUYV422) {
        int x, y;
        uint8_t *line = picture->data[0];
        for(y = 0; y < avctx->height; y++) {
            for(x = 0; x < avctx->width; x++)
                line[2*x + 1] ^= 0x80;
            line += picture->linesize[0];
        }
    }

    *data_size = sizeof(AVPicture);
    return buf_size;
}