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libavcodec/rv34.c

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00001 /*
00002  * RV30/40 decoder common data
00003  * Copyright (c) 2007 Mike Melanson, Konstantin Shishkov
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00027 #include "avcodec.h"
00028 #include "dsputil.h"
00029 #include "mpegvideo.h"
00030 #include "golomb.h"
00031 #include "mathops.h"
00032 #include "rectangle.h"
00033 
00034 #include "rv34vlc.h"
00035 #include "rv34data.h"
00036 #include "rv34.h"
00037 
00038 //#define DEBUG
00039 
00041 static const int rv34_mb_type_to_lavc[12] = {
00042     MB_TYPE_INTRA,
00043     MB_TYPE_INTRA16x16              | MB_TYPE_SEPARATE_DC,
00044     MB_TYPE_16x16   | MB_TYPE_L0,
00045     MB_TYPE_8x8     | MB_TYPE_L0,
00046     MB_TYPE_16x16   | MB_TYPE_L0,
00047     MB_TYPE_16x16   | MB_TYPE_L1,
00048     MB_TYPE_SKIP,
00049     MB_TYPE_DIRECT2 | MB_TYPE_16x16,
00050     MB_TYPE_16x8    | MB_TYPE_L0,
00051     MB_TYPE_8x16    | MB_TYPE_L0,
00052     MB_TYPE_16x16   | MB_TYPE_L0L1,
00053     MB_TYPE_16x16   | MB_TYPE_L0    | MB_TYPE_SEPARATE_DC
00054 };
00055 
00056 
00057 static RV34VLC intra_vlcs[NUM_INTRA_TABLES], inter_vlcs[NUM_INTER_TABLES];
00058 
00071 static void rv34_gen_vlc(const uint8_t *bits, int size, VLC *vlc, const uint8_t *insyms)
00072 {
00073     int i;
00074     int counts[17] = {0}, codes[17];
00075     uint16_t cw[size], syms[size];
00076     uint8_t bits2[size];
00077     int maxbits = 0, realsize = 0;
00078 
00079     for(i = 0; i < size; i++){
00080         if(bits[i]){
00081             bits2[realsize] = bits[i];
00082             syms[realsize] = insyms ? insyms[i] : i;
00083             realsize++;
00084             maxbits = FFMAX(maxbits, bits[i]);
00085             counts[bits[i]]++;
00086         }
00087     }
00088 
00089     codes[0] = 0;
00090     for(i = 0; i < 16; i++)
00091         codes[i+1] = (codes[i] + counts[i]) << 1;
00092     for(i = 0; i < realsize; i++)
00093         cw[i] = codes[bits2[i]]++;
00094 
00095     init_vlc_sparse(vlc, FFMIN(maxbits, 9), realsize,
00096                     bits2, 1, 1,
00097                     cw,    2, 2,
00098                     syms,  2, 2, INIT_VLC_USE_STATIC);
00099 }
00100 
00104 static av_cold void rv34_init_tables(void)
00105 {
00106     int i, j, k;
00107 
00108     for(i = 0; i < NUM_INTRA_TABLES; i++){
00109         for(j = 0; j < 2; j++){
00110             rv34_gen_vlc(rv34_table_intra_cbppat   [i][j], CBPPAT_VLC_SIZE,   &intra_vlcs[i].cbppattern[j],     NULL);
00111             rv34_gen_vlc(rv34_table_intra_secondpat[i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].second_pattern[j], NULL);
00112             rv34_gen_vlc(rv34_table_intra_thirdpat [i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].third_pattern[j],  NULL);
00113             for(k = 0; k < 4; k++)
00114                 rv34_gen_vlc(rv34_table_intra_cbp[i][j+k*2],  CBP_VLC_SIZE,   &intra_vlcs[i].cbp[j][k],         rv34_cbp_code);
00115         }
00116         for(j = 0; j < 4; j++)
00117             rv34_gen_vlc(rv34_table_intra_firstpat[i][j], FIRSTBLK_VLC_SIZE, &intra_vlcs[i].first_pattern[j], NULL);
00118         rv34_gen_vlc(rv34_intra_coeff[i], COEFF_VLC_SIZE, &intra_vlcs[i].coefficient, NULL);
00119     }
00120 
00121     for(i = 0; i < NUM_INTER_TABLES; i++){
00122         rv34_gen_vlc(rv34_inter_cbppat[i], CBPPAT_VLC_SIZE, &inter_vlcs[i].cbppattern[0], NULL);
00123         for(j = 0; j < 4; j++)
00124             rv34_gen_vlc(rv34_inter_cbp[i][j], CBP_VLC_SIZE, &inter_vlcs[i].cbp[0][j], rv34_cbp_code);
00125         for(j = 0; j < 2; j++){
00126             rv34_gen_vlc(rv34_table_inter_firstpat [i][j], FIRSTBLK_VLC_SIZE, &inter_vlcs[i].first_pattern[j],  NULL);
00127             rv34_gen_vlc(rv34_table_inter_secondpat[i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].second_pattern[j], NULL);
00128             rv34_gen_vlc(rv34_table_inter_thirdpat [i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].third_pattern[j],  NULL);
00129         }
00130         rv34_gen_vlc(rv34_inter_coeff[i], COEFF_VLC_SIZE, &inter_vlcs[i].coefficient, NULL);
00131     }
00132 }
00133  // vlc group
00135 
00136 
00142 static av_always_inline void rv34_row_transform(int temp[16], DCTELEM *block)
00143 {
00144     int i;
00145 
00146     for(i=0; i<4; i++){
00147         const int z0= 13*(block[i+8*0] +    block[i+8*2]);
00148         const int z1= 13*(block[i+8*0] -    block[i+8*2]);
00149         const int z2=  7* block[i+8*1] - 17*block[i+8*3];
00150         const int z3= 17* block[i+8*1] +  7*block[i+8*3];
00151 
00152         temp[4*i+0]= z0+z3;
00153         temp[4*i+1]= z1+z2;
00154         temp[4*i+2]= z1-z2;
00155         temp[4*i+3]= z0-z3;
00156     }
00157 }
00158 
00163 static void rv34_inv_transform(DCTELEM *block){
00164     int temp[16];
00165     int i;
00166 
00167     rv34_row_transform(temp, block);
00168 
00169     for(i=0; i<4; i++){
00170         const int z0= 13*(temp[4*0+i] +    temp[4*2+i]) + 0x200;
00171         const int z1= 13*(temp[4*0+i] -    temp[4*2+i]) + 0x200;
00172         const int z2=  7* temp[4*1+i] - 17*temp[4*3+i];
00173         const int z3= 17* temp[4*1+i] +  7*temp[4*3+i];
00174 
00175         block[i*8+0]= (z0 + z3)>>10;
00176         block[i*8+1]= (z1 + z2)>>10;
00177         block[i*8+2]= (z1 - z2)>>10;
00178         block[i*8+3]= (z0 - z3)>>10;
00179     }
00180 
00181 }
00182 
00189 static void rv34_inv_transform_noround(DCTELEM *block){
00190     int temp[16];
00191     int i;
00192 
00193     rv34_row_transform(temp, block);
00194 
00195     for(i=0; i<4; i++){
00196         const int z0= 13*(temp[4*0+i] +    temp[4*2+i]);
00197         const int z1= 13*(temp[4*0+i] -    temp[4*2+i]);
00198         const int z2=  7* temp[4*1+i] - 17*temp[4*3+i];
00199         const int z3= 17* temp[4*1+i] +  7*temp[4*3+i];
00200 
00201         block[i*8+0]= ((z0 + z3)*3)>>11;
00202         block[i*8+1]= ((z1 + z2)*3)>>11;
00203         block[i*8+2]= ((z1 - z2)*3)>>11;
00204         block[i*8+3]= ((z0 - z3)*3)>>11;
00205     }
00206 
00207 }
00208  // transform
00210 
00211 
00220 static int rv34_decode_cbp(GetBitContext *gb, RV34VLC *vlc, int table)
00221 {
00222     int pattern, code, cbp=0;
00223     int ones;
00224     static const int cbp_masks[3] = {0x100000, 0x010000, 0x110000};
00225     static const int shifts[4] = { 0, 2, 8, 10 };
00226     const int *curshift = shifts;
00227     int i, t, mask;
00228 
00229     code = get_vlc2(gb, vlc->cbppattern[table].table, 9, 2);
00230     pattern = code & 0xF;
00231     code >>= 4;
00232 
00233     ones = rv34_count_ones[pattern];
00234 
00235     for(mask = 8; mask; mask >>= 1, curshift++){
00236         if(pattern & mask)
00237             cbp |= get_vlc2(gb, vlc->cbp[table][ones].table, vlc->cbp[table][ones].bits, 1) << curshift[0];
00238     }
00239 
00240     for(i = 0; i < 4; i++){
00241         t = modulo_three_table[code][i];
00242         if(t == 1)
00243             cbp |= cbp_masks[get_bits1(gb)] << i;
00244         if(t == 2)
00245             cbp |= cbp_masks[2] << i;
00246     }
00247     return cbp;
00248 }
00249 
00253 static inline void decode_coeff(DCTELEM *dst, int coef, int esc, GetBitContext *gb, VLC* vlc)
00254 {
00255     if(coef){
00256         if(coef == esc){
00257             coef = get_vlc2(gb, vlc->table, 9, 2);
00258             if(coef > 23){
00259                 coef -= 23;
00260                 coef = 22 + ((1 << coef) | get_bits(gb, coef));
00261             }
00262             coef += esc;
00263         }
00264         if(get_bits1(gb))
00265             coef = -coef;
00266         *dst = coef;
00267     }
00268 }
00269 
00273 static inline void decode_subblock(DCTELEM *dst, int code, const int is_block2, GetBitContext *gb, VLC *vlc)
00274 {
00275     int coeffs[4];
00276 
00277     coeffs[0] = modulo_three_table[code][0];
00278     coeffs[1] = modulo_three_table[code][1];
00279     coeffs[2] = modulo_three_table[code][2];
00280     coeffs[3] = modulo_three_table[code][3];
00281     decode_coeff(dst  , coeffs[0], 3, gb, vlc);
00282     if(is_block2){
00283         decode_coeff(dst+8, coeffs[1], 2, gb, vlc);
00284         decode_coeff(dst+1, coeffs[2], 2, gb, vlc);
00285     }else{
00286         decode_coeff(dst+1, coeffs[1], 2, gb, vlc);
00287         decode_coeff(dst+8, coeffs[2], 2, gb, vlc);
00288     }
00289     decode_coeff(dst+9, coeffs[3], 2, gb, vlc);
00290 }
00291 
00303 static inline void rv34_decode_block(DCTELEM *dst, GetBitContext *gb, RV34VLC *rvlc, int fc, int sc)
00304 {
00305     int code, pattern;
00306 
00307     code = get_vlc2(gb, rvlc->first_pattern[fc].table, 9, 2);
00308 
00309     pattern = code & 0x7;
00310 
00311     code >>= 3;
00312     decode_subblock(dst, code, 0, gb, &rvlc->coefficient);
00313 
00314     if(pattern & 4){
00315         code = get_vlc2(gb, rvlc->second_pattern[sc].table, 9, 2);
00316         decode_subblock(dst + 2, code, 0, gb, &rvlc->coefficient);
00317     }
00318     if(pattern & 2){ // Looks like coefficients 1 and 2 are swapped for this block
00319         code = get_vlc2(gb, rvlc->second_pattern[sc].table, 9, 2);
00320         decode_subblock(dst + 8*2, code, 1, gb, &rvlc->coefficient);
00321     }
00322     if(pattern & 1){
00323         code = get_vlc2(gb, rvlc->third_pattern[sc].table, 9, 2);
00324         decode_subblock(dst + 8*2+2, code, 0, gb, &rvlc->coefficient);
00325     }
00326 
00327 }
00328 
00333 static inline void rv34_dequant4x4(DCTELEM *block, int Qdc, int Q)
00334 {
00335     int i, j;
00336 
00337     block[0] = (block[0] * Qdc + 8) >> 4;
00338     for(i = 0; i < 4; i++)
00339         for(j = !i; j < 4; j++)
00340             block[j + i*8] = (block[j + i*8] * Q + 8) >> 4;
00341 }
00342 
00347 static inline void rv34_dequant4x4_16x16(DCTELEM *block, int Qdc, int Q)
00348 {
00349     int i;
00350 
00351     for(i = 0; i < 3; i++)
00352          block[rv34_dezigzag[i]] = (block[rv34_dezigzag[i]] * Qdc + 8) >> 4;
00353     for(; i < 16; i++)
00354          block[rv34_dezigzag[i]] = (block[rv34_dezigzag[i]] * Q + 8) >> 4;
00355 } //block functions
00357 
00358 
00368 int ff_rv34_get_start_offset(GetBitContext *gb, int mb_size)
00369 {
00370     int i;
00371     for(i = 0; i < 5; i++)
00372         if(rv34_mb_max_sizes[i] >= mb_size - 1)
00373             break;
00374     return rv34_mb_bits_sizes[i];
00375 }
00376 
00380 static inline RV34VLC* choose_vlc_set(int quant, int mod, int type)
00381 {
00382     if(mod == 2 && quant < 19) quant += 10;
00383     else if(mod && quant < 26) quant += 5;
00384     return type ? &inter_vlcs[rv34_quant_to_vlc_set[1][av_clip(quant, 0, 30)]]
00385                 : &intra_vlcs[rv34_quant_to_vlc_set[0][av_clip(quant, 0, 30)]];
00386 }
00387 
00391 static inline int rv34_decode_dquant(GetBitContext *gb, int quant)
00392 {
00393     if(get_bits1(gb))
00394         return rv34_dquant_tab[get_bits1(gb)][quant];
00395     else
00396         return get_bits(gb, 5);
00397 }
00398  //bitstream functions
00400 
00407 static const uint8_t part_sizes_w[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 2 };
00408 
00410 static const uint8_t part_sizes_h[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2 };
00411 
00413 static const uint8_t avail_indexes[4] = { 5, 6, 9, 10 };
00414 
00422 static void rv34_pred_mv(RV34DecContext *r, int block_type, int subblock_no, int dmv_no)
00423 {
00424     MpegEncContext *s = &r->s;
00425     int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
00426     int A[2] = {0}, B[2], C[2];
00427     int i, j;
00428     int mx, my;
00429     int avail_index = avail_indexes[subblock_no];
00430     int c_off = part_sizes_w[block_type];
00431 
00432     mv_pos += (subblock_no & 1) + (subblock_no >> 1)*s->b8_stride;
00433     if(subblock_no == 3)
00434         c_off = -1;
00435 
00436     if(r->avail_cache[avail_index - 1]){
00437         A[0] = s->current_picture_ptr->motion_val[0][mv_pos-1][0];
00438         A[1] = s->current_picture_ptr->motion_val[0][mv_pos-1][1];
00439     }
00440     if(r->avail_cache[avail_index - 4]){
00441         B[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][0];
00442         B[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][1];
00443     }else{
00444         B[0] = A[0];
00445         B[1] = A[1];
00446     }
00447     if(!r->avail_cache[avail_index - 4 + c_off]){
00448         if(r->avail_cache[avail_index - 4] && (r->avail_cache[avail_index - 1] || r->rv30)){
00449             C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][0];
00450             C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][1];
00451         }else{
00452             C[0] = A[0];
00453             C[1] = A[1];
00454         }
00455     }else{
00456         C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+c_off][0];
00457         C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+c_off][1];
00458     }
00459     mx = mid_pred(A[0], B[0], C[0]);
00460     my = mid_pred(A[1], B[1], C[1]);
00461     mx += r->dmv[dmv_no][0];
00462     my += r->dmv[dmv_no][1];
00463     for(j = 0; j < part_sizes_h[block_type]; j++){
00464         for(i = 0; i < part_sizes_w[block_type]; i++){
00465             s->current_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][0] = mx;
00466             s->current_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][1] = my;
00467         }
00468     }
00469 }
00470 
00471 #define GET_PTS_DIFF(a, b) ((a - b + 8192) & 0x1FFF)
00472 
00476 static int calc_add_mv(RV34DecContext *r, int dir, int val)
00477 {
00478     int refdist = GET_PTS_DIFF(r->next_pts, r->last_pts);
00479     int dist = dir ? -GET_PTS_DIFF(r->next_pts, r->cur_pts) : GET_PTS_DIFF(r->cur_pts, r->last_pts);
00480     int mul;
00481 
00482     if(!refdist) return 0;
00483     mul = (dist << 14) / refdist;
00484     return (val * mul + 0x2000) >> 14;
00485 }
00486 
00490 static inline void rv34_pred_b_vector(int A[2], int B[2], int C[2],
00491                                       int A_avail, int B_avail, int C_avail,
00492                                       int *mx, int *my)
00493 {
00494     if(A_avail + B_avail + C_avail != 3){
00495         *mx = A[0] + B[0] + C[0];
00496         *my = A[1] + B[1] + C[1];
00497         if(A_avail + B_avail + C_avail == 2){
00498             *mx /= 2;
00499             *my /= 2;
00500         }
00501     }else{
00502         *mx = mid_pred(A[0], B[0], C[0]);
00503         *my = mid_pred(A[1], B[1], C[1]);
00504     }
00505 }
00506 
00510 static void rv34_pred_mv_b(RV34DecContext *r, int block_type, int dir)
00511 {
00512     MpegEncContext *s = &r->s;
00513     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
00514     int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
00515     int A[2], B[2], C[2];
00516     int has_A = 0, has_B = 0, has_C = 0;
00517     int mx, my;
00518     int i, j;
00519     Picture *cur_pic = s->current_picture_ptr;
00520     const int mask = dir ? MB_TYPE_L1 : MB_TYPE_L0;
00521     int type = cur_pic->mb_type[mb_pos];
00522 
00523     memset(A, 0, sizeof(A));
00524     memset(B, 0, sizeof(B));
00525     memset(C, 0, sizeof(C));
00526     if((r->avail_cache[5-1] & type) & mask){
00527         A[0] = cur_pic->motion_val[dir][mv_pos - 1][0];
00528         A[1] = cur_pic->motion_val[dir][mv_pos - 1][1];
00529         has_A = 1;
00530     }
00531     if((r->avail_cache[5-4] & type) & mask){
00532         B[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride][0];
00533         B[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride][1];
00534         has_B = 1;
00535     }
00536     if((r->avail_cache[5-2] & type) & mask){
00537         C[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][0];
00538         C[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][1];
00539         has_C = 1;
00540     }else if((s->mb_x+1) == s->mb_width && (r->avail_cache[5-5] & type) & mask){
00541         C[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride - 1][0];
00542         C[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride - 1][1];
00543         has_C = 1;
00544     }
00545 
00546     rv34_pred_b_vector(A, B, C, has_A, has_B, has_C, &mx, &my);
00547 
00548     mx += r->dmv[dir][0];
00549     my += r->dmv[dir][1];
00550 
00551     for(j = 0; j < 2; j++){
00552         for(i = 0; i < 2; i++){
00553             cur_pic->motion_val[dir][mv_pos + i + j*s->b8_stride][0] = mx;
00554             cur_pic->motion_val[dir][mv_pos + i + j*s->b8_stride][1] = my;
00555         }
00556     }
00557     if(block_type == RV34_MB_B_BACKWARD || block_type == RV34_MB_B_FORWARD)
00558         fill_rectangle(cur_pic->motion_val[!dir][mv_pos], 2, 2, s->b8_stride, 0, 4);
00559 }
00560 
00564 static void rv34_pred_mv_rv3(RV34DecContext *r, int block_type, int dir)
00565 {
00566     MpegEncContext *s = &r->s;
00567     int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
00568     int A[2] = {0}, B[2], C[2];
00569     int i, j, k;
00570     int mx, my;
00571     int avail_index = avail_indexes[0];
00572 
00573     if(r->avail_cache[avail_index - 1]){
00574         A[0] = s->current_picture_ptr->motion_val[0][mv_pos-1][0];
00575         A[1] = s->current_picture_ptr->motion_val[0][mv_pos-1][1];
00576     }
00577     if(r->avail_cache[avail_index - 4]){
00578         B[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][0];
00579         B[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][1];
00580     }else{
00581         B[0] = A[0];
00582         B[1] = A[1];
00583     }
00584     if(!r->avail_cache[avail_index - 4 + 2]){
00585         if(r->avail_cache[avail_index - 4] && (r->avail_cache[avail_index - 1])){
00586             C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][0];
00587             C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][1];
00588         }else{
00589             C[0] = A[0];
00590             C[1] = A[1];
00591         }
00592     }else{
00593         C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+2][0];
00594         C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+2][1];
00595     }
00596     mx = mid_pred(A[0], B[0], C[0]);
00597     my = mid_pred(A[1], B[1], C[1]);
00598     mx += r->dmv[0][0];
00599     my += r->dmv[0][1];
00600     for(j = 0; j < 2; j++){
00601         for(i = 0; i < 2; i++){
00602             for(k = 0; k < 2; k++){
00603                 s->current_picture_ptr->motion_val[k][mv_pos + i + j*s->b8_stride][0] = mx;
00604                 s->current_picture_ptr->motion_val[k][mv_pos + i + j*s->b8_stride][1] = my;
00605             }
00606         }
00607     }
00608 }
00609 
00610 static const int chroma_coeffs[3] = { 0, 3, 5 };
00611 
00627 static inline void rv34_mc(RV34DecContext *r, const int block_type,
00628                           const int xoff, const int yoff, int mv_off,
00629                           const int width, const int height, int dir,
00630                           const int thirdpel,
00631                           qpel_mc_func (*qpel_mc)[16],
00632                           h264_chroma_mc_func (*chroma_mc))
00633 {
00634     MpegEncContext *s = &r->s;
00635     uint8_t *Y, *U, *V, *srcY, *srcU, *srcV;
00636     int dxy, mx, my, umx, umy, lx, ly, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;
00637     int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride + mv_off;
00638     int is16x16 = 1;
00639 
00640     if(thirdpel){
00641         int chroma_mx, chroma_my;
00642         mx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + (3 << 24)) / 3 - (1 << 24);
00643         my = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + (3 << 24)) / 3 - (1 << 24);
00644         lx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + (3 << 24)) % 3;
00645         ly = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + (3 << 24)) % 3;
00646         chroma_mx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + 1) >> 1;
00647         chroma_my = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + 1) >> 1;
00648         umx = (chroma_mx + (3 << 24)) / 3 - (1 << 24);
00649         umy = (chroma_my + (3 << 24)) / 3 - (1 << 24);
00650         uvmx = chroma_coeffs[(chroma_mx + (3 << 24)) % 3];
00651         uvmy = chroma_coeffs[(chroma_my + (3 << 24)) % 3];
00652     }else{
00653         int cx, cy;
00654         mx = s->current_picture_ptr->motion_val[dir][mv_pos][0] >> 2;
00655         my = s->current_picture_ptr->motion_val[dir][mv_pos][1] >> 2;
00656         lx = s->current_picture_ptr->motion_val[dir][mv_pos][0] & 3;
00657         ly = s->current_picture_ptr->motion_val[dir][mv_pos][1] & 3;
00658         cx = s->current_picture_ptr->motion_val[dir][mv_pos][0] / 2;
00659         cy = s->current_picture_ptr->motion_val[dir][mv_pos][1] / 2;
00660         umx = cx >> 2;
00661         umy = cy >> 2;
00662         uvmx = (cx & 3) << 1;
00663         uvmy = (cy & 3) << 1;
00664         //due to some flaw RV40 uses the same MC compensation routine for H2V2 and H3V3
00665         if(uvmx == 6 && uvmy == 6)
00666             uvmx = uvmy = 4;
00667     }
00668     dxy = ly*4 + lx;
00669     srcY = dir ? s->next_picture_ptr->data[0] : s->last_picture_ptr->data[0];
00670     srcU = dir ? s->next_picture_ptr->data[1] : s->last_picture_ptr->data[1];
00671     srcV = dir ? s->next_picture_ptr->data[2] : s->last_picture_ptr->data[2];
00672     src_x = s->mb_x * 16 + xoff + mx;
00673     src_y = s->mb_y * 16 + yoff + my;
00674     uvsrc_x = s->mb_x * 8 + (xoff >> 1) + umx;
00675     uvsrc_y = s->mb_y * 8 + (yoff >> 1) + umy;
00676     srcY += src_y * s->linesize + src_x;
00677     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
00678     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;
00679     if(   (unsigned)(src_x - !!lx*2) > s->h_edge_pos - !!lx*2 - (width <<3) - 4
00680        || (unsigned)(src_y - !!ly*2) > s->v_edge_pos - !!ly*2 - (height<<3) - 4){
00681         uint8_t *uvbuf= s->edge_emu_buffer + 22 * s->linesize;
00682 
00683         srcY -= 2 + 2*s->linesize;
00684         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, (width<<3)+6, (height<<3)+6,
00685                             src_x - 2, src_y - 2, s->h_edge_pos, s->v_edge_pos);
00686         srcY = s->edge_emu_buffer + 2 + 2*s->linesize;
00687         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, (width<<2)+1, (height<<2)+1,
00688                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);
00689         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, (width<<2)+1, (height<<2)+1,
00690                             uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);
00691         srcU = uvbuf;
00692         srcV = uvbuf + 16;
00693     }
00694     Y = s->dest[0] + xoff      + yoff     *s->linesize;
00695     U = s->dest[1] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
00696     V = s->dest[2] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
00697 
00698     if(block_type == RV34_MB_P_16x8){
00699         qpel_mc[1][dxy](Y, srcY, s->linesize);
00700         Y    += 8;
00701         srcY += 8;
00702     }else if(block_type == RV34_MB_P_8x16){
00703         qpel_mc[1][dxy](Y, srcY, s->linesize);
00704         Y    += 8 * s->linesize;
00705         srcY += 8 * s->linesize;
00706     }
00707     is16x16 = (block_type != RV34_MB_P_8x8) && (block_type != RV34_MB_P_16x8) && (block_type != RV34_MB_P_8x16);
00708     qpel_mc[!is16x16][dxy](Y, srcY, s->linesize);
00709     chroma_mc[2-width]   (U, srcU, s->uvlinesize, height*4, uvmx, uvmy);
00710     chroma_mc[2-width]   (V, srcV, s->uvlinesize, height*4, uvmx, uvmy);
00711 }
00712 
00713 static void rv34_mc_1mv(RV34DecContext *r, const int block_type,
00714                         const int xoff, const int yoff, int mv_off,
00715                         const int width, const int height, int dir)
00716 {
00717     rv34_mc(r, block_type, xoff, yoff, mv_off, width, height, dir, r->rv30,
00718             r->rv30 ? r->s.dsp.put_rv30_tpel_pixels_tab
00719                     : r->s.dsp.put_rv40_qpel_pixels_tab,
00720             r->rv30 ? r->s.dsp.put_h264_chroma_pixels_tab
00721                     : r->s.dsp.put_rv40_chroma_pixels_tab);
00722 }
00723 
00724 static void rv34_mc_2mv(RV34DecContext *r, const int block_type)
00725 {
00726     rv34_mc(r, block_type, 0, 0, 0, 2, 2, 0, r->rv30,
00727             r->rv30 ? r->s.dsp.put_rv30_tpel_pixels_tab
00728                     : r->s.dsp.put_rv40_qpel_pixels_tab,
00729             r->rv30 ? r->s.dsp.put_h264_chroma_pixels_tab
00730                     : r->s.dsp.put_rv40_chroma_pixels_tab);
00731     rv34_mc(r, block_type, 0, 0, 0, 2, 2, 1, r->rv30,
00732             r->rv30 ? r->s.dsp.avg_rv30_tpel_pixels_tab
00733                     : r->s.dsp.avg_rv40_qpel_pixels_tab,
00734             r->rv30 ? r->s.dsp.avg_h264_chroma_pixels_tab
00735                     : r->s.dsp.avg_rv40_chroma_pixels_tab);
00736 }
00737 
00738 static void rv34_mc_2mv_skip(RV34DecContext *r)
00739 {
00740     int i, j;
00741     for(j = 0; j < 2; j++)
00742         for(i = 0; i < 2; i++){
00743              rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 0, r->rv30,
00744                     r->rv30 ? r->s.dsp.put_rv30_tpel_pixels_tab
00745                             : r->s.dsp.put_rv40_qpel_pixels_tab,
00746                     r->rv30 ? r->s.dsp.put_h264_chroma_pixels_tab
00747                             : r->s.dsp.put_rv40_chroma_pixels_tab);
00748              rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 1, r->rv30,
00749                     r->rv30 ? r->s.dsp.avg_rv30_tpel_pixels_tab
00750                             : r->s.dsp.avg_rv40_qpel_pixels_tab,
00751                     r->rv30 ? r->s.dsp.avg_h264_chroma_pixels_tab
00752                             : r->s.dsp.avg_rv40_chroma_pixels_tab);
00753         }
00754 }
00755 
00757 static const int num_mvs[RV34_MB_TYPES] = { 0, 0, 1, 4, 1, 1, 0, 0, 2, 2, 2, 1 };
00758 
00763 static int rv34_decode_mv(RV34DecContext *r, int block_type)
00764 {
00765     MpegEncContext *s = &r->s;
00766     GetBitContext *gb = &s->gb;
00767     int i, j, k, l;
00768     int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
00769     int next_bt;
00770 
00771     memset(r->dmv, 0, sizeof(r->dmv));
00772     for(i = 0; i < num_mvs[block_type]; i++){
00773         r->dmv[i][0] = svq3_get_se_golomb(gb);
00774         r->dmv[i][1] = svq3_get_se_golomb(gb);
00775     }
00776     switch(block_type){
00777     case RV34_MB_TYPE_INTRA:
00778     case RV34_MB_TYPE_INTRA16x16:
00779         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);
00780         return 0;
00781     case RV34_MB_SKIP:
00782         if(s->pict_type == FF_P_TYPE){
00783             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);
00784             rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);
00785             break;
00786         }
00787     case RV34_MB_B_DIRECT:
00788         //surprisingly, it uses motion scheme from next reference frame
00789         next_bt = s->next_picture_ptr->mb_type[s->mb_x + s->mb_y * s->mb_stride];
00790         if(IS_INTRA(next_bt))
00791             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);
00792         else
00793             for(j = 0; j < 2; j++)
00794                 for(i = 0; i < 2; i++)
00795                     for(k = 0; k < 2; k++)
00796                         for(l = 0; l < 2; l++)
00797                             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]);
00798         if(IS_16X16(next_bt)) //we can use whole macroblock MC
00799             rv34_mc_2mv(r, block_type);
00800         else
00801             rv34_mc_2mv_skip(r);
00802         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);
00803         break;
00804     case RV34_MB_P_16x16:
00805     case RV34_MB_P_MIX16x16:
00806         rv34_pred_mv(r, block_type, 0, 0);
00807         rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);
00808         break;
00809     case RV34_MB_B_FORWARD:
00810     case RV34_MB_B_BACKWARD:
00811         r->dmv[1][0] = r->dmv[0][0];
00812         r->dmv[1][1] = r->dmv[0][1];
00813         if(r->rv30)
00814             rv34_pred_mv_rv3(r, block_type, block_type == RV34_MB_B_BACKWARD);
00815         else
00816             rv34_pred_mv_b  (r, block_type, block_type == RV34_MB_B_BACKWARD);
00817         rv34_mc_1mv     (r, block_type, 0, 0, 0, 2, 2, block_type == RV34_MB_B_BACKWARD);
00818         break;
00819     case RV34_MB_P_16x8:
00820     case RV34_MB_P_8x16:
00821         rv34_pred_mv(r, block_type, 0, 0);
00822         rv34_pred_mv(r, block_type, 1 + (block_type == RV34_MB_P_16x8), 1);
00823         if(block_type == RV34_MB_P_16x8){
00824             rv34_mc_1mv(r, block_type, 0, 0, 0,            2, 1, 0);
00825             rv34_mc_1mv(r, block_type, 0, 8, s->b8_stride, 2, 1, 0);
00826         }
00827         if(block_type == RV34_MB_P_8x16){
00828             rv34_mc_1mv(r, block_type, 0, 0, 0, 1, 2, 0);
00829             rv34_mc_1mv(r, block_type, 8, 0, 1, 1, 2, 0);
00830         }
00831         break;
00832     case RV34_MB_B_BIDIR:
00833         rv34_pred_mv_b  (r, block_type, 0);
00834         rv34_pred_mv_b  (r, block_type, 1);
00835         rv34_mc_2mv     (r, block_type);
00836         break;
00837     case RV34_MB_P_8x8:
00838         for(i=0;i< 4;i++){
00839             rv34_pred_mv(r, block_type, i, i);
00840             rv34_mc_1mv (r, block_type, (i&1)<<3, (i&2)<<2, (i&1)+(i>>1)*s->b8_stride, 1, 1, 0);
00841         }
00842         break;
00843     }
00844 
00845     return 0;
00846 } // mv group
00848 
00854 static const int ittrans[9] = {
00855  DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,
00856  VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,
00857 };
00858 
00860 static const int ittrans16[4] = {
00861  DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,
00862 };
00863 
00867 static void rv34_pred_4x4_block(RV34DecContext *r, uint8_t *dst, int stride, int itype, int up, int left, int down, int right)
00868 {
00869     uint8_t *prev = dst - stride + 4;
00870     uint32_t topleft;
00871 
00872     if(!up && !left)
00873         itype = DC_128_PRED;
00874     else if(!up){
00875         if(itype == VERT_PRED) itype = HOR_PRED;
00876         if(itype == DC_PRED)   itype = LEFT_DC_PRED;
00877     }else if(!left){
00878         if(itype == HOR_PRED)  itype = VERT_PRED;
00879         if(itype == DC_PRED)   itype = TOP_DC_PRED;
00880         if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;
00881     }
00882     if(!down){
00883         if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;
00884         if(itype == HOR_UP_PRED) itype = HOR_UP_PRED_RV40_NODOWN;
00885         if(itype == VERT_LEFT_PRED) itype = VERT_LEFT_PRED_RV40_NODOWN;
00886     }
00887     if(!right && up){
00888         topleft = dst[-stride + 3] * 0x01010101;
00889         prev = (uint8_t*)&topleft;
00890     }
00891     r->h.pred4x4[itype](dst, prev, stride);
00892 }
00893 
00895 static void rv34_add_4x4_block(uint8_t *dst, int stride, DCTELEM block[64], int off)
00896 {
00897     int x, y;
00898     for(y = 0; y < 4; y++)
00899         for(x = 0; x < 4; x++)
00900             dst[x + y*stride] = av_clip_uint8(dst[x + y*stride] + block[off + x+y*8]);
00901 }
00902 
00903 static inline int adjust_pred16(int itype, int up, int left)
00904 {
00905     if(!up && !left)
00906         itype = DC_128_PRED8x8;
00907     else if(!up){
00908         if(itype == PLANE_PRED8x8)itype = HOR_PRED8x8;
00909         if(itype == VERT_PRED8x8) itype = HOR_PRED8x8;
00910         if(itype == DC_PRED8x8)   itype = LEFT_DC_PRED8x8;
00911     }else if(!left){
00912         if(itype == PLANE_PRED8x8)itype = VERT_PRED8x8;
00913         if(itype == HOR_PRED8x8)  itype = VERT_PRED8x8;
00914         if(itype == DC_PRED8x8)   itype = TOP_DC_PRED8x8;
00915     }
00916     return itype;
00917 }
00918 
00919 static void rv34_output_macroblock(RV34DecContext *r, int8_t *intra_types, int cbp, int is16)
00920 {
00921     MpegEncContext *s = &r->s;
00922     DSPContext *dsp = &s->dsp;
00923     int i, j;
00924     uint8_t *Y, *U, *V;
00925     int itype;
00926     int avail[6*8] = {0};
00927     int idx;
00928 
00929     // Set neighbour information.
00930     if(r->avail_cache[0])
00931         avail[0] = 1;
00932     if(r->avail_cache[1])
00933         avail[1] = avail[2] = 1;
00934     if(r->avail_cache[2])
00935         avail[3] = avail[4] = 1;
00936     if(r->avail_cache[3])
00937         avail[5] = 1;
00938     if(r->avail_cache[4])
00939         avail[8] = avail[16] = 1;
00940     if(r->avail_cache[8])
00941         avail[24] = avail[32] = 1;
00942 
00943     Y = s->dest[0];
00944     U = s->dest[1];
00945     V = s->dest[2];
00946     if(!is16){
00947         for(j = 0; j < 4; j++){
00948             idx = 9 + j*8;
00949             for(i = 0; i < 4; i++, cbp >>= 1, Y += 4, idx++){
00950                 rv34_pred_4x4_block(r, Y, s->linesize, ittrans[intra_types[i]], avail[idx-8], avail[idx-1], avail[idx+7], avail[idx-7]);
00951                 avail[idx] = 1;
00952                 if(cbp & 1)
00953                     rv34_add_4x4_block(Y, s->linesize, s->block[(i>>1)+(j&2)], (i&1)*4+(j&1)*32);
00954             }
00955             Y += s->linesize * 4 - 4*4;
00956             intra_types += s->b4_stride;
00957         }
00958         intra_types -= s->b4_stride * 4;
00959         fill_rectangle(r->avail_cache + 5, 2, 2, 4, 0, 4);
00960         for(j = 0; j < 2; j++){
00961             idx = 5 + j*4;
00962             for(i = 0; i < 2; i++, cbp >>= 1, idx++){
00963                 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]);
00964                 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]);
00965                 r->avail_cache[idx] = 1;
00966                 if(cbp & 0x01)
00967                     rv34_add_4x4_block(U + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[4], i*4+j*32);
00968                 if(cbp & 0x10)
00969                     rv34_add_4x4_block(V + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[5], i*4+j*32);
00970             }
00971         }
00972     }else{
00973         itype = ittrans16[intra_types[0]];
00974         itype = adjust_pred16(itype, r->avail_cache[5-4], r->avail_cache[5-1]);
00975         r->h.pred16x16[itype](Y, s->linesize);
00976         dsp->add_pixels_clamped(s->block[0], Y,     s->linesize);
00977         dsp->add_pixels_clamped(s->block[1], Y + 8, s->linesize);
00978         Y += s->linesize * 8;
00979         dsp->add_pixels_clamped(s->block[2], Y,     s->linesize);
00980         dsp->add_pixels_clamped(s->block[3], Y + 8, s->linesize);
00981 
00982         itype = ittrans16[intra_types[0]];
00983         if(itype == PLANE_PRED8x8) itype = DC_PRED8x8;
00984         itype = adjust_pred16(itype, r->avail_cache[5-4], r->avail_cache[5-1]);
00985         r->h.pred8x8[itype](U, s->uvlinesize);
00986         dsp->add_pixels_clamped(s->block[4], U, s->uvlinesize);
00987         r->h.pred8x8[itype](V, s->uvlinesize);
00988         dsp->add_pixels_clamped(s->block[5], V, s->uvlinesize);
00989     }
00990 }
00991  // recons group
00993 
00998 static int rv34_decode_mb_header(RV34DecContext *r, int8_t *intra_types)
00999 {
01000     MpegEncContext *s = &r->s;
01001     GetBitContext *gb = &s->gb;
01002     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
01003     int i, t;
01004 
01005     if(!r->si.type){
01006         r->is16 = get_bits1(gb);
01007         if(!r->is16 && !r->rv30){
01008             if(!get_bits1(gb))
01009                 av_log(s->avctx, AV_LOG_ERROR, "Need DQUANT\n");
01010         }
01011         s->current_picture_ptr->mb_type[mb_pos] = r->is16 ? MB_TYPE_INTRA16x16 : MB_TYPE_INTRA;
01012         r->block_type = r->is16 ? RV34_MB_TYPE_INTRA16x16 : RV34_MB_TYPE_INTRA;
01013     }else{
01014         r->block_type = r->decode_mb_info(r);
01015         if(r->block_type == -1)
01016             return -1;
01017         s->current_picture_ptr->mb_type[mb_pos] = rv34_mb_type_to_lavc[r->block_type];
01018         r->mb_type[mb_pos] = r->block_type;
01019         if(r->block_type == RV34_MB_SKIP){
01020             if(s->pict_type == FF_P_TYPE)
01021                 r->mb_type[mb_pos] = RV34_MB_P_16x16;
01022             if(s->pict_type == FF_B_TYPE)
01023                 r->mb_type[mb_pos] = RV34_MB_B_DIRECT;
01024         }
01025         r->is16 = !!IS_INTRA16x16(s->current_picture_ptr->mb_type[mb_pos]);
01026         rv34_decode_mv(r, r->block_type);
01027         if(r->block_type == RV34_MB_SKIP){
01028             fill_rectangle(intra_types, 4, 4, s->b4_stride, 0, sizeof(intra_types[0]));
01029             return 0;
01030         }
01031         r->chroma_vlc = 1;
01032         r->luma_vlc   = 0;
01033     }
01034     if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){
01035         if(r->is16){
01036             t = get_bits(gb, 2);
01037             fill_rectangle(intra_types, 4, 4, s->b4_stride, t, sizeof(intra_types[0]));
01038             r->luma_vlc   = 2;
01039         }else{
01040             if(r->decode_intra_types(r, gb, intra_types) < 0)
01041                 return -1;
01042             r->luma_vlc   = 1;
01043         }
01044         r->chroma_vlc = 0;
01045         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
01046     }else{
01047         for(i = 0; i < 16; i++)
01048             intra_types[(i & 3) + (i>>2) * s->b4_stride] = 0;
01049         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);
01050         if(r->mb_type[mb_pos] == RV34_MB_P_MIX16x16){
01051             r->is16 = 1;
01052             r->chroma_vlc = 1;
01053             r->luma_vlc   = 2;
01054             r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
01055         }
01056     }
01057 
01058     return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);
01059 }
01060 
01069 #define LUMA_CBP_BLOCK_MASK 0x33
01070 
01071 #define U_CBP_MASK 0x0F0000
01072 #define V_CBP_MASK 0xF00000
01073 
01074 
01075 static void rv34_apply_differences(RV34DecContext *r, int cbp)
01076 {
01077     static const int shifts[4] = { 0, 2, 8, 10 };
01078     MpegEncContext *s = &r->s;
01079     int i;
01080 
01081     for(i = 0; i < 4; i++)
01082         if((cbp & (LUMA_CBP_BLOCK_MASK << shifts[i])) || r->block_type == RV34_MB_P_MIX16x16)
01083             s->dsp.add_pixels_clamped(s->block[i], s->dest[0] + (i & 1)*8 + (i&2)*4*s->linesize, s->linesize);
01084     if(cbp & U_CBP_MASK)
01085         s->dsp.add_pixels_clamped(s->block[4], s->dest[1], s->uvlinesize);
01086     if(cbp & V_CBP_MASK)
01087         s->dsp.add_pixels_clamped(s->block[5], s->dest[2], s->uvlinesize);
01088 }
01089 
01090 static int is_mv_diff_gt_3(int16_t (*motion_val)[2], int step)
01091 {
01092     int d;
01093     d = motion_val[0][0] - motion_val[-step][0];
01094     if(d < -3 || d > 3)
01095         return 1;
01096     d = motion_val[0][1] - motion_val[-step][1];
01097     if(d < -3 || d > 3)
01098         return 1;
01099     return 0;
01100 }
01101 
01102 static int rv34_set_deblock_coef(RV34DecContext *r)
01103 {
01104     MpegEncContext *s = &r->s;
01105     int hmvmask = 0, vmvmask = 0, i, j;
01106     int midx = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
01107     int16_t (*motion_val)[2] = s->current_picture_ptr->motion_val[0][midx];
01108     for(j = 0; j < 16; j += 8){
01109         for(i = 0; i < 2; i++){
01110             if(is_mv_diff_gt_3(motion_val + i, 1))
01111                 vmvmask |= 0x11 << (j + i*2);
01112             if((j || s->mb_y) && is_mv_diff_gt_3(motion_val + i, s->b8_stride))
01113                 hmvmask |= 0x03 << (j + i*2);
01114         }
01115         motion_val += s->b8_stride;
01116     }
01117     if(s->first_slice_line)
01118         hmvmask &= ~0x000F;
01119     if(!s->mb_x)
01120         vmvmask &= ~0x1111;
01121     if(r->rv30){ //RV30 marks both subblocks on the edge for filtering
01122         vmvmask |= (vmvmask & 0x4444) >> 1;
01123         hmvmask |= (hmvmask & 0x0F00) >> 4;
01124         if(s->mb_x)
01125             r->deblock_coefs[s->mb_x - 1 + s->mb_y*s->mb_stride] |= (vmvmask & 0x1111) << 3;
01126         if(!s->first_slice_line)
01127             r->deblock_coefs[s->mb_x + (s->mb_y - 1)*s->mb_stride] |= (hmvmask & 0xF) << 12;
01128     }
01129     return hmvmask | vmvmask;
01130 }
01131 
01132 static int rv34_decode_macroblock(RV34DecContext *r, int8_t *intra_types)
01133 {
01134     MpegEncContext *s = &r->s;
01135     GetBitContext *gb = &s->gb;
01136     int cbp, cbp2;
01137     int i, blknum, blkoff;
01138     DCTELEM block16[64];
01139     int luma_dc_quant;
01140     int dist;
01141     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
01142 
01143     // Calculate which neighbours are available. Maybe it's worth optimizing too.
01144     memset(r->avail_cache, 0, sizeof(r->avail_cache));
01145     fill_rectangle(r->avail_cache + 5, 2, 2, 4, 1, 4);
01146     dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;
01147     if(s->mb_x && dist)
01148         r->avail_cache[4] =
01149         r->avail_cache[8] = s->current_picture_ptr->mb_type[mb_pos - 1];
01150     if(dist >= s->mb_width)
01151         r->avail_cache[1] =
01152         r->avail_cache[2] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];
01153     if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)
01154         r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];
01155     if(s->mb_x && dist > s->mb_width)
01156         r->avail_cache[0] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];
01157 
01158     s->qscale = r->si.quant;
01159     cbp = cbp2 = rv34_decode_mb_header(r, intra_types);
01160     r->cbp_luma  [mb_pos] = cbp;
01161     r->cbp_chroma[mb_pos] = cbp >> 16;
01162     if(s->pict_type == FF_I_TYPE)
01163         r->deblock_coefs[mb_pos] = 0xFFFF;
01164     else
01165         r->deblock_coefs[mb_pos] = rv34_set_deblock_coef(r) | r->cbp_luma[mb_pos];
01166     s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;
01167 
01168     if(cbp == -1)
01169         return -1;
01170 
01171     luma_dc_quant = r->block_type == RV34_MB_P_MIX16x16 ? r->luma_dc_quant_p[s->qscale] : r->luma_dc_quant_i[s->qscale];
01172     if(r->is16){
01173         memset(block16, 0, sizeof(block16));
01174         rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0);
01175         rv34_dequant4x4_16x16(block16, rv34_qscale_tab[luma_dc_quant],rv34_qscale_tab[s->qscale]);
01176         rv34_inv_transform_noround(block16);
01177     }
01178 
01179     for(i = 0; i < 16; i++, cbp >>= 1){
01180         if(!r->is16 && !(cbp & 1)) continue;
01181         blknum = ((i & 2) >> 1) + ((i & 8) >> 2);
01182         blkoff = ((i & 1) << 2) + ((i & 4) << 3);
01183         if(cbp & 1)
01184             rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->luma_vlc, 0);
01185         rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[s->qscale],rv34_qscale_tab[s->qscale]);
01186         if(r->is16) //FIXME: optimize
01187             s->block[blknum][blkoff] = block16[(i & 3) | ((i & 0xC) << 1)];
01188         rv34_inv_transform(s->block[blknum] + blkoff);
01189     }
01190     if(r->block_type == RV34_MB_P_MIX16x16)
01191         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);
01192     for(; i < 24; i++, cbp >>= 1){
01193         if(!(cbp & 1)) continue;
01194         blknum = ((i & 4) >> 2) + 4;
01195         blkoff = ((i & 1) << 2) + ((i & 2) << 4);
01196         rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->chroma_vlc, 1);
01197         rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]],rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]]);
01198         rv34_inv_transform(s->block[blknum] + blkoff);
01199     }
01200     if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos]))
01201         rv34_output_macroblock(r, intra_types, cbp2, r->is16);
01202     else
01203         rv34_apply_differences(r, cbp2);
01204 
01205     return 0;
01206 }
01207 
01208 static int check_slice_end(RV34DecContext *r, MpegEncContext *s)
01209 {
01210     int bits;
01211     if(s->mb_y >= s->mb_height)
01212         return 1;
01213     if(!s->mb_num_left)
01214         return 1;
01215     if(r->s.mb_skip_run > 1)
01216         return 0;
01217     bits = r->bits - get_bits_count(&s->gb);
01218     if(bits < 0 || (bits < 8 && !show_bits(&s->gb, bits)))
01219         return 1;
01220     return 0;
01221 }
01222 
01223 static inline int slice_compare(SliceInfo *si1, SliceInfo *si2)
01224 {
01225     return si1->type   != si2->type  ||
01226            si1->start  >= si2->start ||
01227            si1->width  != si2->width ||
01228            si1->height != si2->height||
01229            si1->pts    != si2->pts;
01230 }
01231 
01232 static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int buf_size)
01233 {
01234     MpegEncContext *s = &r->s;
01235     GetBitContext *gb = &s->gb;
01236     int mb_pos;
01237     int res;
01238 
01239     init_get_bits(&r->s.gb, buf, buf_size*8);
01240     res = r->parse_slice_header(r, gb, &r->si);
01241     if(res < 0){
01242         av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");
01243         return -1;
01244     }
01245 
01246     if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr==NULL) {
01247         if(s->width != r->si.width || s->height != r->si.height){
01248             av_log(s->avctx, AV_LOG_DEBUG, "Changing dimensions to %dx%d\n", r->si.width,r->si.height);
01249             MPV_common_end(s);
01250             s->width  = r->si.width;
01251             s->height = r->si.height;
01252             avcodec_set_dimensions(s->avctx, s->width, s->height);
01253             if(MPV_common_init(s) < 0)
01254                 return -1;
01255             r->intra_types_hist = av_realloc(r->intra_types_hist, s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));
01256             r->intra_types = r->intra_types_hist + s->b4_stride * 4;
01257             r->mb_type = av_realloc(r->mb_type, r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));
01258             r->cbp_luma   = av_realloc(r->cbp_luma,   r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));
01259             r->cbp_chroma = av_realloc(r->cbp_chroma, r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));
01260             r->deblock_coefs = av_realloc(r->deblock_coefs, r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));
01261         }
01262         s->pict_type = r->si.type ? r->si.type : FF_I_TYPE;
01263         if(MPV_frame_start(s, s->avctx) < 0)
01264             return -1;
01265         ff_er_frame_start(s);
01266         r->cur_pts = r->si.pts;
01267         if(s->pict_type != FF_B_TYPE){
01268             r->last_pts = r->next_pts;
01269             r->next_pts = r->cur_pts;
01270         }
01271         s->mb_x = s->mb_y = 0;
01272     }
01273 
01274     r->si.end = end;
01275     s->qscale = r->si.quant;
01276     r->bits = buf_size*8;
01277     s->mb_num_left = r->si.end - r->si.start;
01278     r->s.mb_skip_run = 0;
01279 
01280     mb_pos = s->mb_x + s->mb_y * s->mb_width;
01281     if(r->si.start != mb_pos){
01282         av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);
01283         s->mb_x = r->si.start % s->mb_width;
01284         s->mb_y = r->si.start / s->mb_width;
01285     }
01286     memset(r->intra_types_hist, -1, s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));
01287     s->first_slice_line = 1;
01288     s->resync_mb_x= s->mb_x;
01289     s->resync_mb_y= s->mb_y;
01290 
01291     ff_init_block_index(s);
01292     while(!check_slice_end(r, s)) {
01293         ff_update_block_index(s);
01294         s->dsp.clear_blocks(s->block[0]);
01295 
01296         if(rv34_decode_macroblock(r, r->intra_types + s->mb_x * 4 + 1) < 0){
01297             ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
01298             return -1;
01299         }
01300         if (++s->mb_x == s->mb_width) {
01301             s->mb_x = 0;
01302             s->mb_y++;
01303             ff_init_block_index(s);
01304 
01305             memmove(r->intra_types_hist, r->intra_types, s->b4_stride * 4 * sizeof(*r->intra_types_hist));
01306             memset(r->intra_types, -1, s->b4_stride * 4 * sizeof(*r->intra_types_hist));
01307 
01308             if(r->loop_filter && s->mb_y >= 2)
01309                 r->loop_filter(r, s->mb_y - 2);
01310         }
01311         if(s->mb_x == s->resync_mb_x)
01312             s->first_slice_line=0;
01313         s->mb_num_left--;
01314     }
01315     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
01316 
01317     return s->mb_y == s->mb_height;
01318 }
01319  // recons group end
01321 
01325 av_cold int ff_rv34_decode_init(AVCodecContext *avctx)
01326 {
01327     RV34DecContext *r = avctx->priv_data;
01328     MpegEncContext *s = &r->s;
01329 
01330     MPV_decode_defaults(s);
01331     s->avctx= avctx;
01332     s->out_format = FMT_H263;
01333     s->codec_id= avctx->codec_id;
01334 
01335     s->width = avctx->width;
01336     s->height = avctx->height;
01337 
01338     r->s.avctx = avctx;
01339     avctx->flags |= CODEC_FLAG_EMU_EDGE;
01340     r->s.flags |= CODEC_FLAG_EMU_EDGE;
01341     avctx->pix_fmt = PIX_FMT_YUV420P;
01342     avctx->has_b_frames = 1;
01343     s->low_delay = 0;
01344 
01345     if (MPV_common_init(s) < 0)
01346         return -1;
01347 
01348     ff_h264_pred_init(&r->h, CODEC_ID_RV40);
01349 
01350     r->intra_types_hist = av_malloc(s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));
01351     r->intra_types = r->intra_types_hist + s->b4_stride * 4;
01352 
01353     r->mb_type = av_mallocz(r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));
01354 
01355     r->cbp_luma   = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));
01356     r->cbp_chroma = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));
01357     r->deblock_coefs = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));
01358 
01359     if(!intra_vlcs[0].cbppattern[0].bits)
01360         rv34_init_tables();
01361 
01362     return 0;
01363 }
01364 
01365 static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
01366 {
01367     if(avctx->slice_count) return avctx->slice_offset[n];
01368     else                   return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) :  AV_RB32(buf + n*8);
01369 }
01370 
01371 int ff_rv34_decode_frame(AVCodecContext *avctx,
01372                             void *data, int *data_size,
01373                             const uint8_t *buf, int buf_size)
01374 {
01375     RV34DecContext *r = avctx->priv_data;
01376     MpegEncContext *s = &r->s;
01377     AVFrame *pict = data;
01378     SliceInfo si;
01379     int i;
01380     int slice_count;
01381     const uint8_t *slices_hdr = NULL;
01382     int last = 0;
01383 
01384     /* no supplementary picture */
01385     if (buf_size == 0) {
01386         /* special case for last picture */
01387         if (s->low_delay==0 && s->next_picture_ptr) {
01388             *pict= *(AVFrame*)s->next_picture_ptr;
01389             s->next_picture_ptr= NULL;
01390 
01391             *data_size = sizeof(AVFrame);
01392         }
01393         return 0;
01394     }
01395 
01396     if(!avctx->slice_count){
01397         slice_count = (*buf++) + 1;
01398         slices_hdr = buf + 4;
01399         buf += 8 * slice_count;
01400     }else
01401         slice_count = avctx->slice_count;
01402 
01403     //parse first slice header to check whether this frame can be decoded
01404     if(get_slice_offset(avctx, slices_hdr, 0) > buf_size){
01405         av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");
01406         return -1;
01407     }
01408     init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), buf_size-get_slice_offset(avctx, slices_hdr, 0));
01409     if(r->parse_slice_header(r, &r->s.gb, &si) < 0 || si.start){
01410         av_log(avctx, AV_LOG_ERROR, "First slice header is incorrect\n");
01411         return -1;
01412     }
01413     if((!s->last_picture_ptr || !s->last_picture_ptr->data[0]) && si.type == FF_B_TYPE)
01414         return -1;
01415     /* skip b frames if we are in a hurry */
01416     if(avctx->hurry_up && si.type==FF_B_TYPE) return buf_size;
01417     if(   (avctx->skip_frame >= AVDISCARD_NONREF && si.type==FF_B_TYPE)
01418        || (avctx->skip_frame >= AVDISCARD_NONKEY && si.type!=FF_I_TYPE)
01419        ||  avctx->skip_frame >= AVDISCARD_ALL)
01420         return buf_size;
01421     /* skip everything if we are in a hurry>=5 */
01422     if(avctx->hurry_up>=5)
01423         return buf_size;
01424 
01425     for(i=0; i<slice_count; i++){
01426         int offset= get_slice_offset(avctx, slices_hdr, i);
01427         int size;
01428         if(i+1 == slice_count)
01429             size= buf_size - offset;
01430         else
01431             size= get_slice_offset(avctx, slices_hdr, i+1) - offset;
01432 
01433         if(offset > buf_size){
01434             av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");
01435             break;
01436         }
01437 
01438         r->si.end = s->mb_width * s->mb_height;
01439         if(i+1 < slice_count){
01440             init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, i+1), (buf_size-get_slice_offset(avctx, slices_hdr, i+1))*8);
01441             if(r->parse_slice_header(r, &r->s.gb, &si) < 0){
01442                 if(i+2 < slice_count)
01443                     size = get_slice_offset(avctx, slices_hdr, i+2) - offset;
01444                 else
01445                     size = buf_size - offset;
01446             }else
01447                 r->si.end = si.start;
01448         }
01449         last = rv34_decode_slice(r, r->si.end, buf + offset, size);
01450         s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;
01451         if(last)
01452             break;
01453     }
01454 
01455     if(last){
01456         if(r->loop_filter)
01457             r->loop_filter(r, s->mb_height - 1);
01458         ff_er_frame_end(s);
01459         MPV_frame_end(s);
01460         if (s->pict_type == FF_B_TYPE || s->low_delay) {
01461             *pict= *(AVFrame*)s->current_picture_ptr;
01462         } else if (s->last_picture_ptr != NULL) {
01463             *pict= *(AVFrame*)s->last_picture_ptr;
01464         }
01465 
01466         if(s->last_picture_ptr || s->low_delay){
01467             *data_size = sizeof(AVFrame);
01468             ff_print_debug_info(s, pict);
01469         }
01470         s->current_picture_ptr= NULL; //so we can detect if frame_end wasnt called (find some nicer solution...)
01471     }
01472     return buf_size;
01473 }
01474 
01475 av_cold int ff_rv34_decode_end(AVCodecContext *avctx)
01476 {
01477     RV34DecContext *r = avctx->priv_data;
01478 
01479     MPV_common_end(&r->s);
01480 
01481     av_freep(&r->intra_types_hist);
01482     r->intra_types = NULL;
01483     av_freep(&r->mb_type);
01484     av_freep(&r->cbp_luma);
01485     av_freep(&r->cbp_chroma);
01486     av_freep(&r->deblock_coefs);
01487 
01488     return 0;
01489 }

Generated on Tue Nov 4 2014 12:59:22 for ffmpeg by  doxygen 1.7.1