huffyuv.c

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.7平台上编译为嵌入式图形界面操作系统。

                for(cy=y=1; y<s->height; y++,cy++){
                    uint8_t *ydst, *udst, *vdst;
                    
                    if(s->bitstream_bpp==12){
                        decode_gray_bitstream(s, width);
                    
                        ydst= s->picture[0] + s->linesize[0]*y;

                        lefty= add_left_prediction(ydst, s->temp[0], width, lefty);
                        if(s->predictor == PLANE){
                            if(y>s->interlaced)
                                s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
                        }
                        y++;
                        if(y>=s->height) break;
                    }
                    
                    draw_slice(s, y);
                    
                    ydst= s->picture[0] + s->linesize[0]*y;
                    udst= s->picture[1] + s->linesize[1]*cy;
                    vdst= s->picture[2] + s->linesize[2]*cy;
                    
                    decode_422_bitstream(s, width);

                    lefty= add_left_prediction(ydst, s->temp[0], width, lefty);
                    if(!(s->flags&CODEC_FLAG_GRAY)){
                        leftu= add_left_prediction(udst, s->temp[1], width2, leftu);
                        leftv= add_left_prediction(vdst, s->temp[2], width2, leftv);
                    }
                    if(s->predictor == PLANE){
                        if(cy>s->interlaced){
                            s->dsp.add_bytes(ydst, ydst - fake_ystride, width);
                            if(!(s->flags&CODEC_FLAG_GRAY)){
                                s->dsp.add_bytes(udst, udst - fake_ustride, width2);
                                s->dsp.add_bytes(vdst, vdst - fake_vstride, width2);
                            }
                        }
                    }
                }
                draw_slice(s, height);
                
                break;
            case MEDIAN:
                /* first line except first 2 pixels is left predicted */
                decode_422_bitstream(s, width-2);
                lefty= add_left_prediction(s->picture[0] + 2, s->temp[0], width-2, lefty);
                if(!(s->flags&CODEC_FLAG_GRAY)){
                    leftu= add_left_prediction(s->picture[1] + 1, s->temp[1], width2-1, leftu);
                    leftv= add_left_prediction(s->picture[2] + 1, s->temp[2], width2-1, leftv);
                }
                
                cy=y=1;
                
                /* second line is left predicted for interlaced case */
                if(s->interlaced){
                    decode_422_bitstream(s, width);
                    lefty= add_left_prediction(s->picture[0] + s->linesize[0], s->temp[0], width, lefty);
                    if(!(s->flags&CODEC_FLAG_GRAY)){
                        leftu= add_left_prediction(s->picture[1] + s->linesize[2], s->temp[1], width2, leftu);
                        leftv= add_left_prediction(s->picture[2] + s->linesize[1], s->temp[2], width2, leftv);
                    }
                    y++; cy++;
                }

                /* next 4 pixels are left predicted too */
                decode_422_bitstream(s, 4);
                lefty= add_left_prediction(s->picture[0] + fake_ystride, s->temp[0], 4, lefty);
                if(!(s->flags&CODEC_FLAG_GRAY)){
                    leftu= add_left_prediction(s->picture[1] + fake_ustride, s->temp[1], 2, leftu);
                    leftv= add_left_prediction(s->picture[2] + fake_vstride, s->temp[2], 2, leftv);
                }

                /* next line except the first 4 pixels is median predicted */
                lefttopy= s->picture[0][3];
                decode_422_bitstream(s, width-4);
                add_median_prediction(s->picture[0] + fake_ystride+4, s->picture[0]+4, s->temp[0], width-4, &lefty, &lefttopy);
                if(!(s->flags&CODEC_FLAG_GRAY)){
                    lefttopu= s->picture[1][1];
                    lefttopv= s->picture[2][1];
                    add_median_prediction(s->picture[1] + fake_ustride+2, s->picture[1]+2, s->temp[1], width2-2, &leftu, &lefttopu);
                    add_median_prediction(s->picture[2] + fake_vstride+2, s->picture[2]+2, s->temp[2], width2-2, &leftv, &lefttopv);
                }
                y++; cy++;
                
                for(; y<height; y++,cy++){
                    uint8_t *ydst, *udst, *vdst;

                    if(s->bitstream_bpp==12){
                        while(2*cy > y){
                            decode_gray_bitstream(s, width);
                            ydst= s->picture[0] + s->linesize[0]*y;
                            add_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
                            y++;
                        }
                        if(y>=height) break;
                    }
                    draw_slice(s, y);

                    decode_422_bitstream(s, width);

                    ydst= s->picture[0] + s->linesize[0]*y;
                    udst= s->picture[1] + s->linesize[1]*cy;
                    vdst= s->picture[2] + s->linesize[2]*cy;

                    add_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);
                    if(!(s->flags&CODEC_FLAG_GRAY)){
                        add_median_prediction(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);
                        add_median_prediction(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);
                    }
                }

                draw_slice(s, height);
                break;
            }
        }
    }else{
        int y;
        int leftr, leftg, leftb;
        const int last_line= (height-1)*s->linesize[0];
        
        if(s->bitstream_bpp==32){
                   s->picture[0][last_line+3]= get_bits(&s->gb, 8);
            leftr= s->picture[0][last_line+2]= get_bits(&s->gb, 8);
            leftg= s->picture[0][last_line+1]= get_bits(&s->gb, 8);
            leftb= s->picture[0][last_line+0]= get_bits(&s->gb, 8);
        }else{
            leftr= s->picture[0][last_line+2]= get_bits(&s->gb, 8);
            leftg= s->picture[0][last_line+1]= get_bits(&s->gb, 8);
            leftb= s->picture[0][last_line+0]= get_bits(&s->gb, 8);
            skip_bits(&s->gb, 8);
        }
        
        if(s->bgr32){
            switch(s->predictor){
            case LEFT:
            case PLANE:
                decode_bgr_bitstream(s, width-1);
                add_left_prediction_bgr32(s->picture[0] + last_line+4, s->temp[0], width-1, &leftr, &leftg, &leftb);

                for(y=s->height-2; y>=0; y--){ //yes its stored upside down
                    decode_bgr_bitstream(s, width);
                    
                    add_left_prediction_bgr32(s->picture[0] + s->linesize[0]*y, s->temp[0], width, &leftr, &leftg, &leftb);
                    if(s->predictor == PLANE){
                        if((y&s->interlaced)==0){
                            s->dsp.add_bytes(s->picture[0] + s->linesize[0]*y, 
                                             s->picture[0] + s->linesize[0]*y + fake_ystride, fake_ystride);
                        }
                    }
                }
                draw_slice(s, height); // just 1 large slice as this isnt possible in reverse order
                break;
            default:
                fprintf(stderr, "prediction type not supported!\n");
            }
        }else{

            fprintf(stderr, "BGR24 output isnt implemenetd yet\n");
            return -1;
        }
    }
    emms_c();
    
    for(i=0;i<3;i++) {
        picture->data[i] = s->picture[i];
        picture->linesize[i]= s->linesize[i];
    }

    *data_size = sizeof(AVPicture);
    
    return (get_bits_count(&s->gb)+7)>>3;
}

static int decode_end(AVCodecContext *avctx)
{
    HYuvContext *s = avctx->priv_data;
    int i;
    
    for(i=0; i<3; i++){
        if(!(avctx->flags&CODEC_FLAG_DR1))
            av_freep(&s->picture[i]);

        free_vlc(&s->vlc[i]);
    }

    return 0;
}

static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
    HYuvContext *s = avctx->priv_data;
    AVPicture *pict = data;
    const int width= s->width;
    const int width2= s->width>>1;
    const int height= s->height;
    const int fake_ystride= s->interlaced ? pict->linesize[0]*2  : pict->linesize[0];
    const int fake_ustride= s->interlaced ? pict->linesize[1]*2  : pict->linesize[1];
    const int fake_vstride= s->interlaced ? pict->linesize[2]*2  : pict->linesize[2];
    int i, size;

    init_put_bits(&s->pb, buf, buf_size, NULL, NULL);
    
    for(i=0; i<3; i++){
        s->picture[i]= pict->data[i];
        s->linesize[i]= pict->linesize[i];
    }
    
    if(avctx->pix_fmt == PIX_FMT_YUV422P || avctx->pix_fmt == PIX_FMT_YUV420P){
        int lefty, leftu, leftv, y, cy;

        put_bits(&s->pb, 8, leftv= s->picture[2][0]);
        put_bits(&s->pb, 8, lefty= s->picture[0][1]);
        put_bits(&s->pb, 8, leftu= s->picture[1][0]);
        put_bits(&s->pb, 8,        s->picture[0][0]);
        
        lefty= sub_left_prediction(s, s->temp[0], s->picture[0]+2, width-2 , lefty);
        leftu= sub_left_prediction(s, s->temp[1], s->picture[1]+1, width2-1, leftu);
        leftv= sub_left_prediction(s, s->temp[2], s->picture[2]+1, width2-1, leftv);
        
        encode_422_bitstream(s, width-2);
        
        if(s->predictor==MEDIAN){
            int lefttopy, lefttopu, lefttopv;
            cy=y=1;
            if(s->interlaced){
                lefty= sub_left_prediction(s, s->temp[0], s->picture[0]+s->linesize[0], width , lefty);
                leftu= sub_left_prediction(s, s->temp[1], s->picture[1]+s->linesize[1], width2, leftu);
                leftv= sub_left_prediction(s, s->temp[2], s->picture[2]+s->linesize[2], width2, leftv);
        
                encode_422_bitstream(s, width);
                y++; cy++;
            }
            
            lefty= sub_left_prediction(s, s->temp[0], s->picture[0]+fake_ystride, 4, lefty);
            leftu= sub_left_prediction(s, s->temp[1], s->picture[1]+fake_ystride, 2, leftu);
            leftv= sub_left_prediction(s, s->temp[2], s->picture[2]+fake_ystride, 2, leftv);
        
            encode_422_bitstream(s, 4);

            lefttopy= s->picture[0][3];
            lefttopu= s->picture[1][1];
            lefttopv= s->picture[2][1];
            sub_median_prediction(s->temp[0], s->picture[0]+4, s->picture[0] + fake_ystride+4, width-4 , &lefty, &lefttopy);
            sub_median_prediction(s->temp[1], s->picture[1]+2, s->picture[1] + fake_ustride+2, width2-2, &leftu, &lefttopu);
            sub_median_prediction(s->temp[2], s->picture[2]+2, s->picture[2] + fake_vstride+2, width2-2, &leftv, &lefttopv);
            encode_422_bitstream(s, width-4);
            y++; cy++;

            for(; y<height; y++,cy++){
                uint8_t *ydst, *udst, *vdst;
                    
                if(s->bitstream_bpp==12){
                    while(2*cy > y){
                        ydst= s->picture[0] + s->linesize[0]*y;
                        sub_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);
                        encode_gray_bitstream(s, width);
                        y++;
                    }
                    if(y>=height) break;
                }
                ydst= s->picture[0] + s->linesize[0]*y;
                udst= s->picture[1] + s->linesize[1]*cy;
                vdst= s->picture[2] + s->linesize[2]*cy;

                sub_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);
                sub_median_prediction(s->temp[1], udst - fake_ustride, udst, width2, &leftu, &lefttopu);
                sub_median_prediction(s->temp[2], vdst - fake_vstride, vdst, width2, &leftv, &lefttopv);

                encode_422_bitstream(s, width);
            }
        }else{
            for(cy=y=1; y<height; y++,cy++){
                uint8_t *ydst, *udst, *vdst;
                
                /* encode a luma only line & y++ */
                if(s->bitstream_bpp==12){
                    ydst= s->picture[0] + s->linesize[0]*y;

                    if(s->predictor == PLANE && s->interlaced < y){
                        s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);

                        lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);
                    }else{
                        lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);
                    }
                    encode_gray_bitstream(s, width);
                    y++;
                    if(y>=height) break;
                }
                
                ydst= s->picture[0] + s->linesize[0]*y;
                udst= s->picture[1] + s->linesize[1]*cy;
                vdst= s->picture[2] + s->linesize[2]*cy;

                if(s->predictor == PLANE && s->interlaced < cy){
                    s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);
                    s->dsp.diff_bytes(s->temp[2], udst, udst - fake_ustride, width2);
                    s->dsp.diff_bytes(s->temp[3], vdst, vdst - fake_vstride, width2);

                    lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);
                    leftu= sub_left_prediction(s, s->temp[1], s->temp[2], width2, leftu);
                    leftv= sub_left_prediction(s, s->temp[2], s->temp[3], width2, leftv);
                }else{
                    lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);
                    leftu= sub_left_prediction(s, s->temp[1], udst, width2, leftu);
                    leftv= sub_left_prediction(s, s->temp[2], vdst, width2, leftv);
                }

                encode_422_bitstream(s, width);
            }
        }        
    }else{
        fprintf(stderr, "Format not supported!\n");
    }
    emms_c();
    
    size= (get_bit_count(&s->pb)+31)/32;
    
    if((s->flags&CODEC_FLAG_PASS1) && (s->picture_number&31)==0){
        int j;
        char *p= avctx->stats_out;
        for(i=0; i<3; i++){
            for(j=0; j<256; j++){
                sprintf(p, "%Ld ", s->stats[i][j]);
                p+= strlen(p);
                s->stats[i][j]= 0;
            }
            sprintf(p, "\n");
            p++;
        }
    }else{
        flush_put_bits(&s->pb);
        bswap_buf((uint32_t*)buf, (uint32_t*)buf, size);
    }
    
    avctx->key_frame= 1;
    avctx->pict_type= I_TYPE;
    
    s->picture_number++;
    
    return size*4;
}

static int encode_end(AVCodecContext *avctx)
{
//    HYuvContext *s = avctx->priv_data;

    av_freep(&avctx->extradata);
    av_freep(&avctx->stats_out);
    
    return 0;
}

AVCodec huffyuv_decoder = {
    "huffyuv",
    CODEC_TYPE_VIDEO,
    CODEC_ID_HUFFYUV,
    sizeof(HYuvContext),
    decode_init,
    NULL,
    decode_end,
    decode_frame,
    CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,
    NULL
};

AVCodec huffyuv_encoder = {
    "huffyuv",
    CODEC_TYPE_VIDEO,
    CODEC_ID_HUFFYUV,
    sizeof(HYuvContext),
    encode_init,
    encode_frame,
    encode_end,
};