rv34.c

ffmpeg移植到symbian的全部源代码

                    : r->s.dsp.put_h264_qpel_pixels_tab,
            r->s.dsp.put_h264_chroma_pixels_tab);
    rv34_mc(r, block_type, 0, 0, 0, 2, 2, 1, r->rv30,
            r->rv30 ? r->s.dsp.avg_rv30_tpel_pixels_tab
                    : r->s.dsp.avg_h264_qpel_pixels_tab,
            r->s.dsp.avg_h264_chroma_pixels_tab);
}

static void rv34_mc_2mv_skip(RV34DecContext *r)
{
    int i, j, k;
    for(j = 0; j < 2; j++)
        for(i = 0; i < 2; i++){
             rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 0, r->rv30,
                    r->rv30 ? r->s.dsp.put_rv30_tpel_pixels_tab
                            : r->s.dsp.put_h264_qpel_pixels_tab,
                    r->s.dsp.put_h264_chroma_pixels_tab);
             rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 1, r->rv30,
                    r->rv30 ? r->s.dsp.avg_rv30_tpel_pixels_tab
                            : r->s.dsp.avg_h264_qpel_pixels_tab,
                    r->s.dsp.avg_h264_chroma_pixels_tab);
        }
}

/** number of motion vectors in each macroblock type */
static const int num_mvs[RV34_MB_TYPES] = { 0, 0, 1, 4, 1, 1, 0, 0, 2, 2, 2, 1 };

/**
 * Decode motion vector differences
 * and perform motion vector reconstruction and motion compensation.
 */
static int rv34_decode_mv(RV34DecContext *r, int block_type)
{
    MpegEncContext *s = &r->s;
    GetBitContext *gb = &s->gb;
    int i, j, k, l;
    int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
    int next_bt;

    memset(r->dmv, 0, sizeof(r->dmv));
    for(i = 0; i < num_mvs[block_type]; i++){
        r->dmv[i][0] = svq3_get_se_golomb(gb);
        r->dmv[i][1] = svq3_get_se_golomb(gb);
    }
    switch(block_type){
    case RV34_MB_TYPE_INTRA:
    case RV34_MB_TYPE_INTRA16x16:
        fill_rectangle(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], 2, 2, s->b8_stride, 0, 4);
        return 0;
    case RV34_MB_SKIP:
        if(s->pict_type == FF_P_TYPE){
            fill_rectangle(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], 2, 2, s->b8_stride, 0, 4);
            rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);
            break;
        }
    case RV34_MB_B_DIRECT:
        //surprisingly, it uses motion scheme from next reference frame
        next_bt = s->next_picture_ptr->mb_type[s->mb_x + s->mb_y * s->mb_stride];
        for(j = 0; j < 2; j++)
            for(i = 0; i < 2; i++)
                for(k = 0; k < 2; k++)
                    for(l = 0; l < 2; l++)
                        s->current_picture_ptr->motion_val[l][mv_pos + i + j*s->b8_stride][k] = calc_add_mv(r, l, s->next_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][k]);
        if(IS_16X16(next_bt)) //we can use whole macroblock MC
            rv34_mc_2mv(r, block_type);
        else
            rv34_mc_2mv_skip(r);
        fill_rectangle(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], 2, 2, s->b8_stride, 0, 4);
        break;
    case RV34_MB_P_16x16:
    case RV34_MB_P_MIX16x16:
        rv34_pred_mv(r, block_type, 0, 0);
        rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);
        break;
    case RV34_MB_B_FORWARD:
    case RV34_MB_B_BACKWARD:
        r->dmv[1][0] = r->dmv[0][0];
        r->dmv[1][1] = r->dmv[0][1];
        rv34_pred_mv_b  (r, block_type, block_type == RV34_MB_B_BACKWARD);
        rv34_mc_1mv     (r, block_type, 0, 0, 0, 2, 2, block_type == RV34_MB_B_BACKWARD);
        break;
    case RV34_MB_P_16x8:
    case RV34_MB_P_8x16:
        rv34_pred_mv(r, block_type, 0, 0);
        rv34_pred_mv(r, block_type, 1 + (block_type == RV34_MB_P_16x8), 1);
        if(block_type == RV34_MB_P_16x8){
            rv34_mc_1mv(r, block_type, 0, 0, 0,            2, 1, 0);
            rv34_mc_1mv(r, block_type, 0, 8, s->b8_stride, 2, 1, 0);
        }
        if(block_type == RV34_MB_P_8x16){
            rv34_mc_1mv(r, block_type, 0, 0, 0, 1, 2, 0);
            rv34_mc_1mv(r, block_type, 8, 0, 1, 1, 2, 0);
        }
        break;
    case RV34_MB_B_BIDIR:
        rv34_pred_mv_b  (r, block_type, 0);
        rv34_pred_mv_b  (r, block_type, 1);
        rv34_mc_2mv     (r, block_type);
        break;
    case RV34_MB_P_8x8:
        for(i=0;i< 4;i++){
            rv34_pred_mv(r, block_type, i, i);
            rv34_mc_1mv (r, block_type, (i&1)<<3, (i&2)<<2, (i&1)+(i>>1)*s->b8_stride, 1, 1, 0);
        }
        break;
    }

    return 0;
}
/** @} */ // mv group

/**
 * @defgroup recons Macroblock reconstruction functions
 * @{
 */
/** mapping of RV30/40 intra prediction types to standard H.264 types */
static const int ittrans[9] = {
 DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,
 VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,
};

/** mapping of RV30/40 intra 16x16 prediction types to standard H.264 types */
static const int ittrans16[4] = {
 DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,
};

/**
 * Perform 4x4 intra prediction.
 */
static void rv34_pred_4x4_block(RV34DecContext *r, uint8_t *dst, int stride, int itype, int up, int left, int down, int right)
{
    uint8_t *prev = dst - stride + 4;
    uint32_t topleft;

    if(!up && !left)
        itype = DC_128_PRED;
    else if(!up){
        if(itype == VERT_PRED) itype = HOR_PRED;
        if(itype == DC_PRED)   itype = LEFT_DC_PRED;
    }else if(!left){
        if(itype == HOR_PRED)  itype = VERT_PRED;
        if(itype == DC_PRED)   itype = TOP_DC_PRED;
        if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;
    }
    if(!down){
        if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;
        if(itype == HOR_UP_PRED) itype = HOR_UP_PRED_RV40_NODOWN;
        if(itype == VERT_LEFT_PRED) itype = VERT_LEFT_PRED_RV40_NODOWN;
    }
    if(!right && up){
        topleft = dst[-stride + 3] * 0x01010101;
#ifdef __CW32__
        prev = (unsigned char*)&topleft;
#else
        prev = &topleft;
#endif
    }
    r->h.pred4x4[itype](dst, prev, stride);
}

/** add_pixels_clamped for 4x4 block */
static void rv34_add_4x4_block(uint8_t *dst, int stride, DCTELEM block[64], int off)
{
    int x, y;
    for(y = 0; y < 4; y++)
        for(x = 0; x < 4; x++)
            dst[x + y*stride] = av_clip_uint8(dst[x + y*stride] + block[off + x+y*8]);
}

static inline int adjust_pred16(int itype, int up, int left)
{
    if(!up && !left)
        itype = DC_128_PRED8x8;
    else if(!up){
        if(itype == PLANE_PRED8x8)itype = HOR_PRED8x8;
        if(itype == VERT_PRED8x8) itype = HOR_PRED8x8;
        if(itype == DC_PRED8x8)   itype = LEFT_DC_PRED8x8;
    }else if(!left){
        if(itype == PLANE_PRED8x8)itype = VERT_PRED8x8;
        if(itype == HOR_PRED8x8)  itype = VERT_PRED8x8;
        if(itype == DC_PRED8x8)   itype = TOP_DC_PRED8x8;
    }
    return itype;
}

static void rv34_output_macroblock(RV34DecContext *r, int8_t *intra_types, int cbp, int is16)
{
    MpegEncContext *s = &r->s;
    DSPContext *dsp = &s->dsp;
    int i, j;
    uint8_t *Y, *U, *V;
    int itype;
    int avail[6*8] = {0};
    int idx;

    // Set neighbour information.
    if(r->avail_cache[0])
        avail[0] = 1;
    if(r->avail_cache[1])
        avail[1] = avail[2] = 1;
    if(r->avail_cache[2])
        avail[3] = avail[4] = 1;
    if(r->avail_cache[3])
        avail[5] = 1;
    if(r->avail_cache[4])
        avail[8] = avail[16] = 1;
    if(r->avail_cache[8])
        avail[24] = avail[32] = 1;

    Y = s->dest[0];
    U = s->dest[1];
    V = s->dest[2];
    if(!is16){
        for(j = 0; j < 4; j++){
            idx = 9 + j*8;
            for(i = 0; i < 4; i++, cbp >>= 1, Y += 4, idx++){
                rv34_pred_4x4_block(r, Y, s->linesize, ittrans[intra_types[i]], avail[idx-8], avail[idx-1], avail[idx+7], avail[idx-7]);
                avail[idx] = 1;
                if(cbp & 1)
                    rv34_add_4x4_block(Y, s->linesize, s->block[(i>>1)+(j&2)], (i&1)*4+(j&1)*32);
            }
            Y += s->linesize * 4 - 4*4;
            intra_types += s->b4_stride;
        }
        intra_types -= s->b4_stride * 4;
        fill_rectangle(r->avail_cache + 5, 2, 2, 4, 0, 4);
        for(j = 0; j < 2; j++){
            idx = 5 + j*4;
            for(i = 0; i < 2; i++, cbp >>= 1, idx++){
                rv34_pred_4x4_block(r, U + i*4 + j*4*s->uvlinesize, s->uvlinesize, ittrans[intra_types[i*2+j*2*s->b4_stride]], r->avail_cache[idx-4], r->avail_cache[idx-1], !i && !j, r->avail_cache[idx-3]);
                rv34_pred_4x4_block(r, V + i*4 + j*4*s->uvlinesize, s->uvlinesize, ittrans[intra_types[i*2+j*2*s->b4_stride]], r->avail_cache[idx-4], r->avail_cache[idx-1], !i && !j, r->avail_cache[idx-3]);
                r->avail_cache[idx] = 1;
                if(cbp & 0x01)
                    rv34_add_4x4_block(U + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[4], i*4+j*32);
                if(cbp & 0x10)
                    rv34_add_4x4_block(V + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[5], i*4+j*32);
            }
        }
    }else{
        itype = ittrans16[intra_types[0]];
        itype = adjust_pred16(itype, r->avail_cache[5-4], r->avail_cache[5-1]);
        r->h.pred16x16[itype](Y, s->linesize);
        dsp->add_pixels_clamped(s->block[0], Y,     s->current_picture.linesize[0]);
        dsp->add_pixels_clamped(s->block[1], Y + 8, s->current_picture.linesize[0]);
        Y += s->current_picture.linesize[0] * 8;
        dsp->add_pixels_clamped(s->block[2], Y,     s->current_picture.linesize[0]);
        dsp->add_pixels_clamped(s->block[3], Y + 8, s->current_picture.linesize[0]);

        itype = ittrans16[intra_types[0]];
        if(itype == PLANE_PRED8x8) itype = DC_PRED8x8;
        itype = adjust_pred16(itype, r->avail_cache[5-4], r->avail_cache[5-1]);
        r->h.pred8x8[itype](U, s->uvlinesize);
        dsp->add_pixels_clamped(s->block[4], U, s->uvlinesize);
        r->h.pred8x8[itype](V, s->uvlinesize);
        dsp->add_pixels_clamped(s->block[5], V, s->uvlinesize);
    }
}

/** @} */ // recons group

/**
 * @addtogroup bitstream
 * Decode macroblock header and return CBP in case of success, -1 otherwise.
 */
static int rv34_decode_mb_header(RV34DecContext *r, int8_t *intra_types)
{
    MpegEncContext *s = &r->s;
    GetBitContext *gb = &s->gb;
    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
    int i, t;

    if(!r->si.type){
        r->is16 = get_bits1(gb);
        if(!r->is16 && !r->rv30){
            if(!get_bits1(gb))
                av_log(s->avctx, AV_LOG_ERROR, "Need DQUANT\n");
        }
        s->current_picture_ptr->mb_type[mb_pos] = r->is16 ? MB_TYPE_INTRA16x16 : MB_TYPE_INTRA;
        r->block_type = r->is16 ? RV34_MB_TYPE_INTRA16x16 : RV34_MB_TYPE_INTRA;
    }else{
        r->block_type = r->decode_mb_info(r);
        if(r->block_type == -1)
            return -1;
        s->current_picture_ptr->mb_type[mb_pos] = rv34_mb_type_to_lavc[r->block_type];
        r->mb_type[mb_pos] = r->block_type;
        if(r->block_type == RV34_MB_SKIP){
            if(s->pict_type == FF_P_TYPE)
                r->mb_type[mb_pos] = RV34_MB_P_16x16;
            if(s->pict_type == FF_B_TYPE)
                r->mb_type[mb_pos] = RV34_MB_B_DIRECT;
        }
        r->is16 = !!IS_INTRA16x16(s->current_picture_ptr->mb_type[mb_pos]);
        rv34_decode_mv(r, r->block_type);
        if(r->block_type == RV34_MB_SKIP){
            fill_rectangle(intra_types, 4, 4, s->b4_stride, 0, sizeof(intra_types[0]));
            return 0;
        }
        r->chroma_vlc = 1;
        r->luma_vlc   = 0;
    }
    if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){
        if(r->is16){
            t = get_bits(gb, 2);
            fill_rectangle(intra_types, 4, 4, s->b4_stride, t, sizeof(intra_types[0]));
            r->luma_vlc   = 2;
        }else{
            if(r->decode_intra_types(r, gb, intra_types) < 0)
                return -1;
            r->luma_vlc   = 1;
        }
        r->chroma_vlc = 0;
        r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
    }else{
        for(i = 0; i < 16; i++)
            intra_types[(i & 3) + (i>>2) * s->b4_stride] = 0;
        r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);
        if(r->mb_type[mb_pos] == RV34_MB_P_MIX16x16){
            r->is16 = 1;
            r->chroma_vlc = 1;
            r->luma_vlc   = 2;
            r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
        }
    }

    return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);
}

/**
 * @addtogroup recons
 * @{
 */
/**
 * mask for retrieving all bits in coded block pattern
 * corresponding to one 8x8 block
 */
#define LUMA_CBP_BLOCK_MASK 0x303

#define U_CBP_MASK 0x0F0000
#define V_CBP_MASK 0xF00000