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libavcodec/mpeg12enc.c

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00001 /*
00002  * MPEG1/2 encoder
00003  * Copyright (c) 2000,2001 Fabrice Bellard
00004  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
00005  *
00006  * This file is part of Libav.
00007  *
00008  * Libav is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * Libav is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with Libav; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00028 #include "avcodec.h"
00029 #include "dsputil.h"
00030 #include "mathops.h"
00031 #include "mpegvideo.h"
00032 
00033 #include "mpeg12.h"
00034 #include "mpeg12data.h"
00035 #include "bytestream.h"
00036 
00037 #include "libavutil/log.h"
00038 #include "libavutil/opt.h"
00039 
00040 static const uint8_t inv_non_linear_qscale[13] = {
00041     0, 2, 4, 6, 8,
00042     9,10,11,12,13,14,15,16,
00043 };
00044 
00045 static const uint8_t svcd_scan_offset_placeholder[14] = {
00046     0x10, 0x0E,
00047     0x00, 0x80, 0x81,
00048     0x00, 0x80, 0x81,
00049     0xff, 0xff, 0xff,
00050     0xff, 0xff, 0xff,
00051 };
00052 
00053 static void mpeg1_encode_block(MpegEncContext *s,
00054                          DCTELEM *block,
00055                          int component);
00056 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
00057 
00058 static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
00059 static uint8_t fcode_tab[MAX_MV*2+1];
00060 
00061 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
00062 static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
00063 
00064 /* simple include everything table for dc, first byte is bits number next 3 are code*/
00065 static uint32_t mpeg1_lum_dc_uni[512];
00066 static uint32_t mpeg1_chr_dc_uni[512];
00067 
00068 static uint8_t mpeg1_index_run[2][64];
00069 static int8_t mpeg1_max_level[2][64];
00070 
00071 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
00072     int i;
00073 
00074     for(i=0; i<128; i++){
00075         int level= i-64;
00076         int run;
00077         if (!level)
00078             continue;
00079         for(run=0; run<64; run++){
00080             int len, code;
00081 
00082             int alevel= FFABS(level);
00083 
00084             if (alevel > rl->max_level[0][run])
00085                 code= 111; /*rl->n*/
00086             else
00087                 code= rl->index_run[0][run] + alevel - 1;
00088 
00089             if (code < 111 /* rl->n */) {
00090                 /* length of vlc and sign */
00091                 len=   rl->table_vlc[code][1]+1;
00092             } else {
00093                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
00094 
00095                 if (alevel < 128) {
00096                     len += 8;
00097                 } else {
00098                     len += 16;
00099                 }
00100             }
00101 
00102             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
00103         }
00104     }
00105 }
00106 
00107 
00108 static int find_frame_rate_index(MpegEncContext *s){
00109     int i;
00110     int64_t dmin= INT64_MAX;
00111     int64_t d;
00112 
00113     for(i=1;i<14;i++) {
00114         int64_t n0= 1001LL/avpriv_frame_rate_tab[i].den*avpriv_frame_rate_tab[i].num*s->avctx->time_base.num;
00115         int64_t n1= 1001LL*s->avctx->time_base.den;
00116         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && i>=9) break;
00117 
00118         d = FFABS(n0 - n1);
00119         if(d < dmin){
00120             dmin=d;
00121             s->frame_rate_index= i;
00122         }
00123     }
00124     if(dmin)
00125         return -1;
00126     else
00127         return 0;
00128 }
00129 
00130 static av_cold int encode_init(AVCodecContext *avctx)
00131 {
00132     MpegEncContext *s = avctx->priv_data;
00133 
00134     if(MPV_encode_init(avctx) < 0)
00135         return -1;
00136 
00137 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
00138     if (avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)
00139         s->drop_frame_timecode = 1;
00140     if (avctx->flags & CODEC_FLAG_SVCD_SCAN_OFFSET)
00141         s->scan_offset = 1;
00142 #endif
00143 
00144     if(find_frame_rate_index(s) < 0){
00145         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
00146             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
00147             return -1;
00148         }else{
00149             av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n", avctx->time_base.den, avctx->time_base.num);
00150         }
00151     }
00152 
00153     if(avctx->profile == FF_PROFILE_UNKNOWN){
00154         if(avctx->level != FF_LEVEL_UNKNOWN){
00155             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
00156             return -1;
00157         }
00158         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
00159     }
00160 
00161     if(avctx->level == FF_LEVEL_UNKNOWN){
00162         if(avctx->profile == 0){ /* 4:2:2 */
00163             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
00164             else                                            avctx->level = 2; /* High */
00165         }else{
00166             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
00167                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
00168                 return -1;
00169             }
00170             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
00171             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
00172             else                                            avctx->level = 4; /* High */
00173         }
00174     }
00175 
00176     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
00177         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
00178         return -1;
00179     }
00180 
00181     return 0;
00182 }
00183 
00184 static void put_header(MpegEncContext *s, int header)
00185 {
00186     avpriv_align_put_bits(&s->pb);
00187     put_bits(&s->pb, 16, header>>16);
00188     put_sbits(&s->pb, 16, header);
00189 }
00190 
00191 /* put sequence header if needed */
00192 static void mpeg1_encode_sequence_header(MpegEncContext *s)
00193 {
00194         unsigned int vbv_buffer_size;
00195         unsigned int fps, v;
00196         int i;
00197         uint64_t time_code;
00198         float best_aspect_error= 1E10;
00199         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
00200         int constraint_parameter_flag;
00201 
00202         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
00203 
00204         if (s->current_picture.f.key_frame) {
00205             AVRational framerate= avpriv_frame_rate_tab[s->frame_rate_index];
00206 
00207             /* mpeg1 header repeated every gop */
00208             put_header(s, SEQ_START_CODE);
00209 
00210             put_sbits(&s->pb, 12, s->width );
00211             put_sbits(&s->pb, 12, s->height);
00212 
00213             for(i=1; i<15; i++){
00214                 float error= aspect_ratio;
00215                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
00216                     error-= 1.0/ff_mpeg1_aspect[i];
00217                 else
00218                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
00219 
00220                 error= FFABS(error);
00221 
00222                 if(error < best_aspect_error){
00223                     best_aspect_error= error;
00224                     s->aspect_ratio_info= i;
00225                 }
00226             }
00227 
00228             put_bits(&s->pb, 4, s->aspect_ratio_info);
00229             put_bits(&s->pb, 4, s->frame_rate_index);
00230 
00231             if(s->avctx->rc_max_rate){
00232                 v = (s->avctx->rc_max_rate + 399) / 400;
00233                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
00234                     v = 0x3ffff;
00235             }else{
00236                 v= 0x3FFFF;
00237             }
00238 
00239             if(s->avctx->rc_buffer_size)
00240                 vbv_buffer_size = s->avctx->rc_buffer_size;
00241             else
00242                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
00243                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
00244             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
00245 
00246             put_sbits(&s->pb, 18, v);
00247             put_bits(&s->pb, 1, 1); /* marker */
00248             put_sbits(&s->pb, 10, vbv_buffer_size);
00249 
00250             constraint_parameter_flag=
00251                 s->width <= 768 && s->height <= 576 &&
00252                 s->mb_width * s->mb_height <= 396 &&
00253                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
00254                 framerate.num <= framerate.den*30 &&
00255                 s->avctx->me_range && s->avctx->me_range < 128 &&
00256                 vbv_buffer_size <= 20 &&
00257                 v <= 1856000/400 &&
00258                 s->codec_id == CODEC_ID_MPEG1VIDEO;
00259 
00260             put_bits(&s->pb, 1, constraint_parameter_flag);
00261 
00262             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
00263             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
00264 
00265             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
00266                 put_header(s, EXT_START_CODE);
00267                 put_bits(&s->pb, 4, 1); //seq ext
00268 
00269                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
00270 
00271                 put_bits(&s->pb, 3, s->avctx->profile); //profile
00272                 put_bits(&s->pb, 4, s->avctx->level); //level
00273 
00274                 put_bits(&s->pb, 1, s->progressive_sequence);
00275                 put_bits(&s->pb, 2, s->chroma_format);
00276                 put_bits(&s->pb, 2, s->width >>12);
00277                 put_bits(&s->pb, 2, s->height>>12);
00278                 put_bits(&s->pb, 12, v>>18); //bitrate ext
00279                 put_bits(&s->pb, 1, 1); //marker
00280                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
00281                 put_bits(&s->pb, 1, s->low_delay);
00282                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
00283                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
00284             }
00285 
00286             put_header(s, GOP_START_CODE);
00287             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
00288             /* time code : we must convert from the real frame rate to a
00289                fake mpeg frame rate in case of low frame rate */
00290             fps = (framerate.num + framerate.den/2)/ framerate.den;
00291             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
00292 
00293             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
00294             if (s->drop_frame_timecode) {
00295                 /* only works for NTSC 29.97 */
00296                 int d = time_code / 17982;
00297                 int m = time_code % 17982;
00298                 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
00299                 time_code += 18 * d + 2 * ((m - 2) / 1798);
00300             }
00301             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
00302             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
00303             put_bits(&s->pb, 1, 1);
00304             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
00305             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
00306             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
00307             put_bits(&s->pb, 1, 0); /* broken link */
00308         }
00309 }
00310 
00311 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
00312     while (run >= 33) {
00313         put_bits(&s->pb, 11, 0x008);
00314         run -= 33;
00315     }
00316     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
00317              ff_mpeg12_mbAddrIncrTable[run][0]);
00318 }
00319 
00320 static av_always_inline void put_qscale(MpegEncContext *s)
00321 {
00322     if(s->q_scale_type){
00323         assert(s->qscale>=1 && s->qscale <=12);
00324         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
00325     }else{
00326         put_bits(&s->pb, 5, s->qscale);
00327     }
00328 }
00329 
00330 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
00331     if (s->height > 2800) {
00332         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
00333         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
00334     } else {
00335         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
00336     }
00337     put_qscale(s);
00338     put_bits(&s->pb, 1, 0); /* slice extra information */
00339 }
00340 
00341 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
00342 {
00343     mpeg1_encode_sequence_header(s);
00344 
00345     /* mpeg1 picture header */
00346     put_header(s, PICTURE_START_CODE);
00347     /* temporal reference */
00348 
00349     // RAL: s->picture_number instead of s->fake_picture_number
00350     put_bits(&s->pb, 10, (s->picture_number -
00351                           s->gop_picture_number) & 0x3ff);
00352     put_bits(&s->pb, 3, s->pict_type);
00353 
00354     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
00355     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
00356 
00357     // RAL: Forward f_code also needed for B frames
00358     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
00359         put_bits(&s->pb, 1, 0); /* half pel coordinates */
00360         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
00361             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
00362         else
00363             put_bits(&s->pb, 3, 7); /* forward_f_code */
00364     }
00365 
00366     // RAL: Backward f_code necessary for B frames
00367     if (s->pict_type == AV_PICTURE_TYPE_B) {
00368         put_bits(&s->pb, 1, 0); /* half pel coordinates */
00369         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
00370             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
00371         else
00372             put_bits(&s->pb, 3, 7); /* backward_f_code */
00373     }
00374 
00375     put_bits(&s->pb, 1, 0); /* extra bit picture */
00376 
00377     s->frame_pred_frame_dct = 1;
00378     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
00379         put_header(s, EXT_START_CODE);
00380         put_bits(&s->pb, 4, 8); //pic ext
00381         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
00382             put_bits(&s->pb, 4, s->f_code);
00383             put_bits(&s->pb, 4, s->f_code);
00384         }else{
00385             put_bits(&s->pb, 8, 255);
00386         }
00387         if (s->pict_type == AV_PICTURE_TYPE_B) {
00388             put_bits(&s->pb, 4, s->b_code);
00389             put_bits(&s->pb, 4, s->b_code);
00390         }else{
00391             put_bits(&s->pb, 8, 255);
00392         }
00393         put_bits(&s->pb, 2, s->intra_dc_precision);
00394 
00395         assert(s->picture_structure == PICT_FRAME);
00396         put_bits(&s->pb, 2, s->picture_structure);
00397         if (s->progressive_sequence) {
00398             put_bits(&s->pb, 1, 0); /* no repeat */
00399         } else {
00400             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
00401         }
00402         /* XXX: optimize the generation of this flag with entropy
00403            measures */
00404         s->frame_pred_frame_dct = s->progressive_sequence;
00405 
00406         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
00407         put_bits(&s->pb, 1, s->concealment_motion_vectors);
00408         put_bits(&s->pb, 1, s->q_scale_type);
00409         put_bits(&s->pb, 1, s->intra_vlc_format);
00410         put_bits(&s->pb, 1, s->alternate_scan);
00411         put_bits(&s->pb, 1, s->repeat_first_field);
00412         s->progressive_frame = s->progressive_sequence;
00413         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
00414         put_bits(&s->pb, 1, s->progressive_frame);
00415         put_bits(&s->pb, 1, 0); //composite_display_flag
00416     }
00417     if (s->scan_offset) {
00418         int i;
00419 
00420         put_header(s, USER_START_CODE);
00421         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
00422             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
00423         }
00424     }
00425 
00426     s->mb_y=0;
00427     ff_mpeg1_encode_slice_header(s);
00428 }
00429 
00430 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
00431                                 int has_mv, int field_motion)
00432 {
00433     put_bits(&s->pb, n, bits);
00434     if (!s->frame_pred_frame_dct) {
00435         if (has_mv)
00436             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
00437         put_bits(&s->pb, 1, s->interlaced_dct);
00438     }
00439 }
00440 
00441 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
00442                                                    DCTELEM block[6][64],
00443                                                    int motion_x, int motion_y,
00444                                                    int mb_block_count)
00445 {
00446     int i, cbp;
00447     const int mb_x = s->mb_x;
00448     const int mb_y = s->mb_y;
00449     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
00450 
00451     /* compute cbp */
00452     cbp = 0;
00453     for(i=0;i<mb_block_count;i++) {
00454         if (s->block_last_index[i] >= 0)
00455             cbp |= 1 << (mb_block_count - 1 - i);
00456     }
00457 
00458     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
00459         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
00460         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
00461         (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
00462         ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
00463         s->mb_skip_run++;
00464         s->qscale -= s->dquant;
00465         s->skip_count++;
00466         s->misc_bits++;
00467         s->last_bits++;
00468         if(s->pict_type == AV_PICTURE_TYPE_P){
00469             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
00470             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
00471         }
00472     } else {
00473         if(first_mb){
00474             assert(s->mb_skip_run == 0);
00475             encode_mb_skip_run(s, s->mb_x);
00476         }else{
00477             encode_mb_skip_run(s, s->mb_skip_run);
00478         }
00479 
00480         if (s->pict_type == AV_PICTURE_TYPE_I) {
00481             if(s->dquant && cbp){
00482                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
00483                 put_qscale(s);
00484             }else{
00485                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
00486                 s->qscale -= s->dquant;
00487             }
00488             s->misc_bits+= get_bits_diff(s);
00489             s->i_count++;
00490         } else if (s->mb_intra) {
00491             if(s->dquant && cbp){
00492                 put_mb_modes(s, 6, 0x01, 0, 0);
00493                 put_qscale(s);
00494             }else{
00495                 put_mb_modes(s, 5, 0x03, 0, 0);
00496                 s->qscale -= s->dquant;
00497             }
00498             s->misc_bits+= get_bits_diff(s);
00499             s->i_count++;
00500             memset(s->last_mv, 0, sizeof(s->last_mv));
00501         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
00502             if(s->mv_type == MV_TYPE_16X16){
00503                 if (cbp != 0) {
00504                     if ((motion_x|motion_y) == 0) {
00505                         if(s->dquant){
00506                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
00507                             put_qscale(s);
00508                         }else{
00509                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
00510                         }
00511                         s->misc_bits+= get_bits_diff(s);
00512                     } else {
00513                         if(s->dquant){
00514                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
00515                             put_qscale(s);
00516                         }else{
00517                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
00518                         }
00519                         s->misc_bits+= get_bits_diff(s);
00520                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
00521                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
00522                         s->mv_bits+= get_bits_diff(s);
00523                     }
00524                 } else {
00525                     put_bits(&s->pb, 3, 1); /* motion only */
00526                     if (!s->frame_pred_frame_dct)
00527                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
00528                     s->misc_bits+= get_bits_diff(s);
00529                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
00530                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
00531                     s->qscale -= s->dquant;
00532                     s->mv_bits+= get_bits_diff(s);
00533                 }
00534                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
00535                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
00536             }else{
00537                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
00538 
00539                 if (cbp) {
00540                     if(s->dquant){
00541                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
00542                         put_qscale(s);
00543                     }else{
00544                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
00545                     }
00546                 } else {
00547                     put_bits(&s->pb, 3, 1); /* motion only */
00548                     put_bits(&s->pb, 2, 1); /* motion_type: field */
00549                     s->qscale -= s->dquant;
00550                 }
00551                 s->misc_bits+= get_bits_diff(s);
00552                 for(i=0; i<2; i++){
00553                     put_bits(&s->pb, 1, s->field_select[0][i]);
00554                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
00555                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
00556                     s->last_mv[0][i][0]=   s->mv[0][i][0];
00557                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
00558                 }
00559                 s->mv_bits+= get_bits_diff(s);
00560             }
00561             if(cbp) {
00562                 if (s->chroma_y_shift) {
00563                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
00564                 } else {
00565                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
00566                     put_sbits(&s->pb, 2, cbp);
00567                 }
00568             }
00569             s->f_count++;
00570         } else{
00571             if(s->mv_type == MV_TYPE_16X16){
00572                 if (cbp){    // With coded bloc pattern
00573                     if (s->dquant) {
00574                         if(s->mv_dir == MV_DIR_FORWARD)
00575                             put_mb_modes(s, 6, 3, 1, 0);
00576                         else
00577                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
00578                         put_qscale(s);
00579                     } else {
00580                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
00581                     }
00582                 }else{    // No coded bloc pattern
00583                     put_bits(&s->pb, 5-s->mv_dir, 2);
00584                     if (!s->frame_pred_frame_dct)
00585                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
00586                     s->qscale -= s->dquant;
00587                 }
00588                 s->misc_bits += get_bits_diff(s);
00589                 if (s->mv_dir&MV_DIR_FORWARD){
00590                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
00591                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
00592                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
00593                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
00594                     s->f_count++;
00595                 }
00596                 if (s->mv_dir&MV_DIR_BACKWARD){
00597                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
00598                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
00599                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
00600                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
00601                     s->b_count++;
00602                 }
00603             }else{
00604                 assert(s->mv_type == MV_TYPE_FIELD);
00605                 assert(!s->frame_pred_frame_dct);
00606                 if (cbp){    // With coded bloc pattern
00607                     if (s->dquant) {
00608                         if(s->mv_dir == MV_DIR_FORWARD)
00609                             put_mb_modes(s, 6, 3, 1, 1);
00610                         else
00611                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
00612                         put_qscale(s);
00613                     } else {
00614                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
00615                     }
00616                 }else{    // No coded bloc pattern
00617                     put_bits(&s->pb, 5-s->mv_dir, 2);
00618                     put_bits(&s->pb, 2, 1); /* motion_type: field */
00619                     s->qscale -= s->dquant;
00620                 }
00621                 s->misc_bits += get_bits_diff(s);
00622                 if (s->mv_dir&MV_DIR_FORWARD){
00623                     for(i=0; i<2; i++){
00624                         put_bits(&s->pb, 1, s->field_select[0][i]);
00625                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
00626                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
00627                         s->last_mv[0][i][0]=   s->mv[0][i][0];
00628                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
00629                     }
00630                     s->f_count++;
00631                 }
00632                 if (s->mv_dir&MV_DIR_BACKWARD){
00633                     for(i=0; i<2; i++){
00634                         put_bits(&s->pb, 1, s->field_select[1][i]);
00635                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
00636                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
00637                         s->last_mv[1][i][0]=   s->mv[1][i][0];
00638                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
00639                     }
00640                     s->b_count++;
00641                 }
00642             }
00643             s->mv_bits += get_bits_diff(s);
00644             if(cbp) {
00645                 if (s->chroma_y_shift) {
00646                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
00647                 } else {
00648                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
00649                     put_sbits(&s->pb, 2, cbp);
00650                 }
00651             }
00652         }
00653         for(i=0;i<mb_block_count;i++) {
00654             if (cbp & (1 << (mb_block_count - 1 - i))) {
00655                 mpeg1_encode_block(s, block[i], i);
00656             }
00657         }
00658         s->mb_skip_run = 0;
00659         if(s->mb_intra)
00660             s->i_tex_bits+= get_bits_diff(s);
00661         else
00662             s->p_tex_bits+= get_bits_diff(s);
00663     }
00664 }
00665 
00666 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
00667 {
00668     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
00669     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
00670 }
00671 
00672 // RAL: Parameter added: f_or_b_code
00673 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
00674 {
00675     if (val == 0) {
00676         /* zero vector */
00677         put_bits(&s->pb,
00678                  ff_mpeg12_mbMotionVectorTable[0][1],
00679                  ff_mpeg12_mbMotionVectorTable[0][0]);
00680     } else {
00681         int code, sign, bits;
00682         int bit_size = f_or_b_code - 1;
00683         int range = 1 << bit_size;
00684         /* modulo encoding */
00685         val = sign_extend(val, 5 + bit_size);
00686 
00687         if (val >= 0) {
00688             val--;
00689             code = (val >> bit_size) + 1;
00690             bits = val & (range - 1);
00691             sign = 0;
00692         } else {
00693             val = -val;
00694             val--;
00695             code = (val >> bit_size) + 1;
00696             bits = val & (range - 1);
00697             sign = 1;
00698         }
00699 
00700         assert(code > 0 && code <= 16);
00701 
00702         put_bits(&s->pb,
00703                  ff_mpeg12_mbMotionVectorTable[code][1],
00704                  ff_mpeg12_mbMotionVectorTable[code][0]);
00705 
00706         put_bits(&s->pb, 1, sign);
00707         if (bit_size > 0) {
00708             put_bits(&s->pb, bit_size, bits);
00709         }
00710     }
00711 }
00712 
00713 void ff_mpeg1_encode_init(MpegEncContext *s)
00714 {
00715     static int done=0;
00716 
00717     ff_mpeg12_common_init(s);
00718 
00719     if(!done){
00720         int f_code;
00721         int mv;
00722         int i;
00723 
00724         done=1;
00725         ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
00726         ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
00727 
00728         for(i=0; i<64; i++)
00729         {
00730                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
00731                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
00732         }
00733 
00734         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
00735         if(s->intra_vlc_format)
00736             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
00737 
00738         /* build unified dc encoding tables */
00739         for(i=-255; i<256; i++)
00740         {
00741                 int adiff, index;
00742                 int bits, code;
00743                 int diff=i;
00744 
00745                 adiff = FFABS(diff);
00746                 if(diff<0) diff--;
00747                 index = av_log2(2*adiff);
00748 
00749                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
00750                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
00751                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
00752 
00753                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
00754                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
00755                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
00756         }
00757 
00758         for(f_code=1; f_code<=MAX_FCODE; f_code++){
00759             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
00760                 int len;
00761 
00762                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
00763                 else{
00764                     int val, bit_size, code;
00765 
00766                     bit_size = f_code - 1;
00767 
00768                     val=mv;
00769                     if (val < 0)
00770                         val = -val;
00771                     val--;
00772                     code = (val >> bit_size) + 1;
00773                     if(code<17){
00774                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
00775                     }else{
00776                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
00777                     }
00778                 }
00779 
00780                 mv_penalty[f_code][mv+MAX_MV]= len;
00781             }
00782         }
00783 
00784 
00785         for(f_code=MAX_FCODE; f_code>0; f_code--){
00786             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
00787                 fcode_tab[mv+MAX_MV]= f_code;
00788             }
00789         }
00790     }
00791     s->me.mv_penalty= mv_penalty;
00792     s->fcode_tab= fcode_tab;
00793     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
00794         s->min_qcoeff=-255;
00795         s->max_qcoeff= 255;
00796     }else{
00797         s->min_qcoeff=-2047;
00798         s->max_qcoeff= 2047;
00799     }
00800     if (s->intra_vlc_format) {
00801         s->intra_ac_vlc_length=
00802         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
00803     } else {
00804         s->intra_ac_vlc_length=
00805         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
00806     }
00807     s->inter_ac_vlc_length=
00808     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
00809 }
00810 
00811 static inline void encode_dc(MpegEncContext *s, int diff, int component)
00812 {
00813   if(((unsigned) (diff+255)) >= 511){
00814         int index;
00815 
00816         if(diff<0){
00817             index= av_log2_16bit(-2*diff);
00818             diff--;
00819         }else{
00820             index= av_log2_16bit(2*diff);
00821         }
00822         if (component == 0) {
00823             put_bits(
00824                 &s->pb,
00825                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
00826                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
00827         }else{
00828             put_bits(
00829                 &s->pb,
00830                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
00831                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
00832         }
00833   }else{
00834     if (component == 0) {
00835         put_bits(
00836             &s->pb,
00837             mpeg1_lum_dc_uni[diff+255]&0xFF,
00838             mpeg1_lum_dc_uni[diff+255]>>8);
00839     } else {
00840         put_bits(
00841             &s->pb,
00842             mpeg1_chr_dc_uni[diff+255]&0xFF,
00843             mpeg1_chr_dc_uni[diff+255]>>8);
00844     }
00845   }
00846 }
00847 
00848 static void mpeg1_encode_block(MpegEncContext *s,
00849                                DCTELEM *block,
00850                                int n)
00851 {
00852     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
00853     int code, component;
00854     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
00855 
00856     last_index = s->block_last_index[n];
00857 
00858     /* DC coef */
00859     if (s->mb_intra) {
00860         component = (n <= 3 ? 0 : (n&1) + 1);
00861         dc = block[0]; /* overflow is impossible */
00862         diff = dc - s->last_dc[component];
00863         encode_dc(s, diff, component);
00864         s->last_dc[component] = dc;
00865         i = 1;
00866         if (s->intra_vlc_format)
00867             table_vlc = ff_rl_mpeg2.table_vlc;
00868     } else {
00869         /* encode the first coefficient : needs to be done here because
00870            it is handled slightly differently */
00871         level = block[0];
00872         if (abs(level) == 1) {
00873                 code = ((uint32_t)level >> 31); /* the sign bit */
00874                 put_bits(&s->pb, 2, code | 0x02);
00875                 i = 1;
00876         } else {
00877             i = 0;
00878             last_non_zero = -1;
00879             goto next_coef;
00880         }
00881     }
00882 
00883     /* now quantify & encode AC coefs */
00884     last_non_zero = i - 1;
00885 
00886     for(;i<=last_index;i++) {
00887         j = s->intra_scantable.permutated[i];
00888         level = block[j];
00889     next_coef:
00890         /* encode using VLC */
00891         if (level != 0) {
00892             run = i - last_non_zero - 1;
00893 
00894             alevel= level;
00895             MASK_ABS(sign, alevel)
00896             sign&=1;
00897 
00898             if (alevel <= mpeg1_max_level[0][run]){
00899                 code= mpeg1_index_run[0][run] + alevel - 1;
00900                 /* store the vlc & sign at once */
00901                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
00902             } else {
00903                 /* escape seems to be pretty rare <5% so I do not optimize it */
00904                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
00905                 /* escape: only clip in this case */
00906                 put_bits(&s->pb, 6, run);
00907                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
00908                     if (alevel < 128) {
00909                         put_sbits(&s->pb, 8, level);
00910                     } else {
00911                         if (level < 0) {
00912                             put_bits(&s->pb, 16, 0x8001 + level + 255);
00913                         } else {
00914                             put_sbits(&s->pb, 16, level);
00915                         }
00916                     }
00917                 }else{
00918                     put_sbits(&s->pb, 12, level);
00919                 }
00920             }
00921             last_non_zero = i;
00922         }
00923     }
00924     /* end of block */
00925     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
00926 }
00927 
00928 #define OFFSET(x) offsetof(MpegEncContext, x)
00929 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
00930 #define COMMON_OPTS\
00931     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },\
00932     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE}, \
00933     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
00934 
00935 static const AVOption mpeg1_options[] = {
00936     COMMON_OPTS
00937     { NULL },
00938 };
00939 
00940 static const AVOption mpeg2_options[] = {
00941     COMMON_OPTS
00942     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
00943     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
00944     { NULL },
00945 };
00946 
00947 #define mpeg12_class(x)\
00948 static const AVClass mpeg## x ##_class = {\
00949     .class_name   = "mpeg" #x "video encoder",\
00950     .item_name    = av_default_item_name,\
00951     .option       = mpeg## x ##_options,\
00952     .version      = LIBAVUTIL_VERSION_INT,\
00953 };
00954 
00955 mpeg12_class(1)
00956 mpeg12_class(2)
00957 
00958 AVCodec ff_mpeg1video_encoder = {
00959     .name           = "mpeg1video",
00960     .type           = AVMEDIA_TYPE_VIDEO,
00961     .id             = CODEC_ID_MPEG1VIDEO,
00962     .priv_data_size = sizeof(MpegEncContext),
00963     .init           = encode_init,
00964     .encode         = MPV_encode_picture,
00965     .close          = MPV_encode_end,
00966     .supported_framerates= avpriv_frame_rate_tab+1,
00967     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
00968     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
00969     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
00970     .priv_class     = &mpeg1_class,
00971 };
00972 
00973 AVCodec ff_mpeg2video_encoder = {
00974     .name           = "mpeg2video",
00975     .type           = AVMEDIA_TYPE_VIDEO,
00976     .id             = CODEC_ID_MPEG2VIDEO,
00977     .priv_data_size = sizeof(MpegEncContext),
00978     .init           = encode_init,
00979     .encode         = MPV_encode_picture,
00980     .close          = MPV_encode_end,
00981     .supported_framerates= avpriv_frame_rate_tab+1,
00982     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE},
00983     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
00984     .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
00985     .priv_class     = &mpeg2_class,
00986 };
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