huffyuv.c

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.10平台上编译为嵌入式图形界面操作系统。

            return -1;
    }else{
        switch(avctx->bits_per_sample&7){
        case 1:
            s->predictor= LEFT;
            s->decorrelate= 0;
            break;
        case 2:
            s->predictor= LEFT;
            s->decorrelate= 1;
            break;
        case 3:
            s->predictor= PLANE;
            s->decorrelate= avctx->bits_per_sample >= 24;
            break;
        case 4:
            s->predictor= MEDIAN;
            s->decorrelate= 0;
            break;
        default:
            s->predictor= LEFT; //OLD
            s->decorrelate= 0;
            break;
        }
        s->bitstream_bpp= avctx->bits_per_sample & ~7;
        
        if(read_old_huffman_tables(s) < 0)
            return -1;
    }
    
    s->interlaced= height > 288;
    
    switch(s->bitstream_bpp){
    case 12:
        avctx->pix_fmt = PIX_FMT_YUV420P;
        break;
    case 16:
        if(s->yuy2){
            avctx->pix_fmt = PIX_FMT_YUV422;
        }else{
            avctx->pix_fmt = PIX_FMT_YUV422P;
        }
        break;
    case 24:
    case 32:
        if(s->bgr32){
            avctx->pix_fmt = PIX_FMT_RGBA32;
        }else{
            avctx->pix_fmt = PIX_FMT_BGR24;
        }
        break;
    default:
        assert(0);
    }
    
//    printf("pred:%d bpp:%d hbpp:%d il:%d\n", s->predictor, s->bitstream_bpp, avctx->bits_per_sample, s->interlaced);
    
    return 0;
}

static void store_table(HYuvContext *s, uint8_t *len){
    int i;
    int index= s->avctx->extradata_size;

    for(i=0; i<256;){
        int val= len[i];
        int repeat=0;
        
        for(; i<256 && len[i]==val && repeat<255; i++)
            repeat++;
        
        assert(val < 32 && val >0 && repeat<256 && repeat>0);
        if(repeat>7){
            ((uint8_t*)s->avctx->extradata)[index++]= val;
            ((uint8_t*)s->avctx->extradata)[index++]= repeat;
        }else{
            ((uint8_t*)s->avctx->extradata)[index++]= val | (repeat<<5);
        }
    }
    
    s->avctx->extradata_size= index;
}

static int encode_init(AVCodecContext *avctx)
{
    HYuvContext *s = avctx->priv_data;
    int i, j, width, height;

    s->avctx= avctx;
    s->flags= avctx->flags;
        
    dsputil_init(&s->dsp, avctx);
    
    width= s->width= avctx->width;
    height= s->height= avctx->height;
    
    assert(width && height);
    
    avctx->extradata= av_mallocz(1024*30);
    avctx->stats_out= av_mallocz(1024*30);
    s->version=2;
    
    avctx->coded_frame= &s->picture;
    
    switch(avctx->pix_fmt){
    case PIX_FMT_YUV420P:
        if(avctx->strict_std_compliance>=0){
            av_log(avctx, AV_LOG_ERROR, "YV12-huffyuv is experimental, there WILL be no compatbility! (use (v)strict=-1)\n");
            return -1;
        }
        s->bitstream_bpp= 12;
        break;
    case PIX_FMT_YUV422P:
        s->bitstream_bpp= 16;
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "format not supported\n");
        return -1;
    }
    avctx->bits_per_sample= s->bitstream_bpp;
    s->decorrelate= s->bitstream_bpp >= 24;
    s->predictor= avctx->prediction_method;
    
    ((uint8_t*)avctx->extradata)[0]= s->predictor;
    ((uint8_t*)avctx->extradata)[1]= s->bitstream_bpp;
    ((uint8_t*)avctx->extradata)[2]=
    ((uint8_t*)avctx->extradata)[3]= 0;
    s->avctx->extradata_size= 4;
    
    if(avctx->stats_in){
        char *p= avctx->stats_in;
    
        for(i=0; i<3; i++)
            for(j=0; j<256; j++)
                s->stats[i][j]= 1;

        for(;;){
            for(i=0; i<3; i++){
                char *next;

                for(j=0; j<256; j++){
                    s->stats[i][j]+= strtol(p, &next, 0);
                    if(next==p) return -1;
                    p=next;
                }        
            }
            if(p[0]==0 || p[1]==0 || p[2]==0) break;
        }
    }else{
        for(i=0; i<3; i++)
            for(j=0; j<256; j++){
                int d= FFMIN(j, 256-j);
                
                s->stats[i][j]= 100000000/(d+1);
            }
    }
    
    for(i=0; i<3; i++){
        generate_len_table(s->len[i], s->stats[i], 256);

        if(generate_bits_table(s->bits[i], s->len[i])<0){
            return -1;
        }
        
        store_table(s, s->len[i]);
    }

    for(i=0; i<3; i++)
        for(j=0; j<256; j++)
            s->stats[i][j]= 0;
    
    s->interlaced= height > 288;

//    printf("pred:%d bpp:%d hbpp:%d il:%d\n", s->predictor, s->bitstream_bpp, avctx->bits_per_sample, s->interlaced);

    s->picture_number=0;

    return 0;
}

static void decode_422_bitstream(HYuvContext *s, int count){
    int i;

    count/=2;
    
    for(i=0; i<count; i++){
        s->temp[0][2*i  ]= get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3); 
        s->temp[1][  i  ]= get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3); 
        s->temp[0][2*i+1]= get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3); 
        s->temp[2][  i  ]= get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3); 
    }
}

static void decode_gray_bitstream(HYuvContext *s, int count){
    int i;
    
    count/=2;
    
    for(i=0; i<count; i++){
        s->temp[0][2*i  ]= get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3); 
        s->temp[0][2*i+1]= get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3); 
    }
}

static void encode_422_bitstream(HYuvContext *s, int count){
    int i;
    
    count/=2;
    if(s->flags&CODEC_FLAG_PASS1){
        for(i=0; i<count; i++){
            s->stats[0][ s->temp[0][2*i  ] ]++;
            s->stats[1][ s->temp[1][  i  ] ]++;
            s->stats[0][ s->temp[0][2*i+1] ]++;
            s->stats[2][ s->temp[2][  i  ] ]++;
        }
    }else{
        for(i=0; i<count; i++){
            put_bits(&s->pb, s->len[0][ s->temp[0][2*i  ] ], s->bits[0][ s->temp[0][2*i  ] ]);
            put_bits(&s->pb, s->len[1][ s->temp[1][  i  ] ], s->bits[1][ s->temp[1][  i  ] ]);
            put_bits(&s->pb, s->len[0][ s->temp[0][2*i+1] ], s->bits[0][ s->temp[0][2*i+1] ]);
            put_bits(&s->pb, s->len[2][ s->temp[2][  i  ] ], s->bits[2][ s->temp[2][  i  ] ]);
        }
    }
}

static void encode_gray_bitstream(HYuvContext *s, int count){
    int i;
    
    count/=2;
    if(s->flags&CODEC_FLAG_PASS1){
        for(i=0; i<count; i++){
            s->stats[0][ s->temp[0][2*i  ] ]++;
            s->stats[0][ s->temp[0][2*i+1] ]++;
        }
    }else{
        for(i=0; i<count; i++){
            put_bits(&s->pb, s->len[0][ s->temp[0][2*i  ] ], s->bits[0][ s->temp[0][2*i  ] ]);
            put_bits(&s->pb, s->len[0][ s->temp[0][2*i+1] ], s->bits[0][ s->temp[0][2*i+1] ]);
        }
    }
}

static void decode_bgr_bitstream(HYuvContext *s, int count){
    int i;

    if(s->decorrelate){
        if(s->bitstream_bpp==24){
            for(i=0; i<count; i++){
                s->temp[0][4*i+1]= get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3); 
                s->temp[0][4*i  ]= get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3) + s->temp[0][4*i+1];
                s->temp[0][4*i+2]= get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3) + s->temp[0][4*i+1];
            }
        }else{
            for(i=0; i<count; i++){
                s->temp[0][4*i+1]= get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3); 
                s->temp[0][4*i  ]= get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3) + s->temp[0][4*i+1];
                s->temp[0][4*i+2]= get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3) + s->temp[0][4*i+1]; 
                                   get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3); //?!
            }
        }
    }else{
        if(s->bitstream_bpp==24){
            for(i=0; i<count; i++){
                s->temp[0][4*i  ]= get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);
                s->temp[0][4*i+1]= get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3); 
                s->temp[0][4*i+2]= get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3); 
            }
        }else{
            for(i=0; i<count; i++){
                s->temp[0][4*i  ]= get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);
                s->temp[0][4*i+1]= get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3); 
                s->temp[0][4*i+2]= get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3); 
                                   get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3); //?!
            }
        }
    }
}

static void draw_slice(HYuvContext *s, int y){
    int h, cy;
    int offset[4];
    
    if(s->avctx->draw_horiz_band==NULL) 
        return;
        
    h= y - s->last_slice_end;
    y -= h;
    
    if(s->bitstream_bpp==12){
        cy= y>>1;
    }else{
        cy= y;
    }

    offset[0] = s->picture.linesize[0]*y;
    offset[1] = s->picture.linesize[1]*cy;
    offset[2] = s->picture.linesize[2]*cy;
    offset[3] = 0;
    emms_c();

    s->avctx->draw_horiz_band(s->avctx, &s->picture, offset, y, 3, h);
    
    s->last_slice_end= y + h;
}

static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size){
    HYuvContext *s = avctx->priv_data;
    const int width= s->width;
    const int width2= s->width>>1;
    const int height= s->height;
    int fake_ystride, fake_ustride, fake_vstride;
    AVFrame * const p= &s->picture;

    AVFrame *picture = data;

    *data_size = 0;

    /* no supplementary picture */
    if (buf_size == 0)
        return 0;

    s->dsp.bswap_buf((uint32_t*)s->bitstream_buffer, (uint32_t*)buf, buf_size/4);
    
    init_get_bits(&s->gb, s->bitstream_buffer, buf_size*8);

    if(p->data[0])
        avctx->release_buffer(avctx, p);

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

    fake_ystride= s->interlaced ? p->linesize[0]*2  : p->linesize[0];
    fake_ustride= s->interlaced ? p->linesize[1]*2  : p->linesize[1];
    fake_vstride= s->interlaced ? p->linesize[2]*2  : p->linesize[2];
    
    s->last_slice_end= 0;
        
    if(s->bitstream_bpp<24){
        int y, cy;
        int lefty, leftu, leftv;
        int lefttopy, lefttopu, lefttopv;
        
        if(s->yuy2){
            p->data[0][3]= get_bits(&s->gb, 8);
            p->data[0][2]= get_bits(&s->gb, 8);
            p->data[0][1]= get_bits(&s->gb, 8);
            p->data[0][0]= get_bits(&s->gb, 8);
            
            av_log(avctx, AV_LOG_ERROR, "YUY2 output isnt implemenetd yet\n");
            return -1;
        }else{
        
            leftv= p->data[2][0]= get_bits(&s->gb, 8);
            lefty= p->data[0][1]= get_bits(&s->gb, 8);
            leftu= p->data[1][0]= get_bits(&s->gb, 8);
                   p->data[0][0]= get_bits(&s->gb, 8);
        
            switch(s->predictor){
            case LEFT:
            case PLANE:
                decode_422_bitstream(s, width-2);
                lefty= add_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);
                if(!(s->flags&CODEC_FLAG_GRAY)){
                    leftu= add_left_prediction(p->data[1] + 1, s->temp[1], width2-1, leftu);
                    leftv= add_left_prediction(p->data[2] + 1, s->temp[2], width2-1, leftv);
                }

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