ffv1.c

    }else if(f->colorspace==1){
        if(f->chroma_h_shift || f->chroma_v_shift){
            av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");
            return -1;
        }
        f->avctx->pix_fmt= PIX_FMT_RGB32;
    }else{
        av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");
        return -1;
    }

//printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

    context_count=1;
    for(i=0; i<5; i++){
        context_count*= read_quant_table(c, f->quant_table[i], context_count);
        if(context_count < 0 || context_count > 32768){
            av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
            return -1;
        }
    }
    context_count= (context_count+1)/2;

    for(i=0; i<f->plane_count; i++){
        PlaneContext * const p= &f->plane[i];

        p->context_count= context_count;

        if(f->ac){
            if(!p->state) p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));
        }else{
            if(!p->vlc_state) p->vlc_state= av_malloc(p->context_count*sizeof(VlcState));
        }
    }

    return 0;
}

static av_cold int decode_init(AVCodecContext *avctx)
{
//    FFV1Context *s = avctx->priv_data;

    common_init(avctx);

    return 0;
}

static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    FFV1Context *f = avctx->priv_data;
    RangeCoder * const c= &f->c;
    const int width= f->width;
    const int height= f->height;
    AVFrame * const p= &f->picture;
    int bytes_read;
    uint8_t keystate= 128;

    AVFrame *picture = data;

    ff_init_range_decoder(c, buf, buf_size);
    ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);


    p->pict_type= FF_I_TYPE; //FIXME I vs. P
    if(get_rac(c, &keystate)){
        p->key_frame= 1;
        if(read_header(f) < 0)
            return -1;
        clear_state(f);
    }else{
        p->key_frame= 0;
    }
    if(!f->plane[0].state && !f->plane[0].vlc_state)
        return -1;

    p->reference= 0;
    if(avctx->get_buffer(avctx, p) < 0){
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
        return -1;
    }

    if(avctx->debug&FF_DEBUG_PICT_INFO)
        av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

    if(!f->ac){
        bytes_read = c->bytestream - c->bytestream_start - 1;
        if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME
//printf("pos=%d\n", bytes_read);
        init_get_bits(&f->gb, buf + bytes_read, buf_size - bytes_read);
    } else {
        bytes_read = 0; /* avoid warning */
    }

    if(f->colorspace==0){
        const int chroma_width = -((-width )>>f->chroma_h_shift);
        const int chroma_height= -((-height)>>f->chroma_v_shift);
        decode_plane(f, p->data[0], width, height, p->linesize[0], 0);

        decode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);
        decode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);
    }else{
        decode_rgb_frame(f, (uint32_t*)p->data[0], width, height, p->linesize[0]/4);
    }

    emms_c();

    f->picture_number++;

    *picture= *p;

    avctx->release_buffer(avctx, p); //FIXME

    *data_size = sizeof(AVFrame);

    if(f->ac){
        bytes_read= c->bytestream - c->bytestream_start - 1;
        if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of frame\n");
    }else{
        bytes_read+= (get_bits_count(&f->gb)+7)/8;
    }

    return bytes_read;
}

AVCodec ffv1_decoder = {
    "ffv1",
    AVMEDIA_TYPE_VIDEO,
    CODEC_ID_FFV1,
    sizeof(FFV1Context),
    decode_init,
    NULL,
    common_end,
    decode_frame,
    CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
    NULL,
    .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),
};

#if CONFIG_FFV1_ENCODER
AVCodec ffv1_encoder = {
    "ffv1",
    AVMEDIA_TYPE_VIDEO,
    CODEC_ID_FFV1,
    sizeof(FFV1Context),
    encode_init,
    encode_frame,
    common_end,
    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_RGB32, PIX_FMT_YUV420P16, PIX_FMT_YUV422P16, PIX_FMT_YUV444P16, PIX_FMT_NONE},
    .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),
};
#endif