libavcodec/wmv2enc.c

   1 /*
   2  * Copyright (c) 2002 The FFmpeg Project
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "avcodec.h"
  22 #include "dsputil.h"
  23 #include "mpegvideo.h"
  24 #include "msmpeg4.h"
  25 #include "msmpeg4data.h"
  26 #include "wmv2.h"
  27
  28
  29 static int encode_ext_header(Wmv2Context *w){
  30     MpegEncContext * const s= &w->s;
  31     PutBitContext pb;
  32     int code;
  33
  34     init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
  35
  36     put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
  37     put_bits(&pb, 11, FFMIN(s->bit_rate/1024, 2047));
  38
  39     put_bits(&pb, 1, w->mspel_bit=1);
  40     put_bits(&pb, 1, s->loop_filter);
  41     put_bits(&pb, 1, w->abt_flag=1);
  42     put_bits(&pb, 1, w->j_type_bit=1);
  43     put_bits(&pb, 1, w->top_left_mv_flag=0);
  44     put_bits(&pb, 1, w->per_mb_rl_bit=1);
  45     put_bits(&pb, 3, code=1);
  46
  47     flush_put_bits(&pb);
  48
  49     s->slice_height = s->mb_height / code;
  50
  51     return 0;
  52 }
  53
  54 static av_cold int wmv2_encode_init(AVCodecContext *avctx){
  55     Wmv2Context * const w= avctx->priv_data;
  56
  57     if(MPV_encode_init(avctx) < 0)
  58         return -1;
  59
  60     ff_wmv2_common_init(w);
  61
  62     avctx->extradata_size= 4;
  63     avctx->extradata= av_mallocz(avctx->extradata_size + 10);
  64     encode_ext_header(w);
  65
  66     return 0;
  67 }
  68
  69 #if 0 /* unused, remove? */
  70 static av_cold int wmv2_encode_end(AVCodecContext *avctx){
  71
  72     if(MPV_encode_end(avctx) < 0)
  73         return -1;
  74
  75     avctx->extradata_size= 0;
  76     av_freep(&avctx->extradata);
  77
  78     return 0;
  79 }
  80 #endif
  81
  82 int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number)
  83 {
  84     Wmv2Context * const w= (Wmv2Context*)s;
  85
  86     put_bits(&s->pb, 1, s->pict_type - 1);
  87     if(s->pict_type == FF_I_TYPE){
  88         put_bits(&s->pb, 7, 0);
  89     }
  90     put_bits(&s->pb, 5, s->qscale);
  91
  92     s->dc_table_index = 1;
  93     s->mv_table_index = 1; /* only if P frame */
  94 //    s->use_skip_mb_code = 1; /* only if P frame */
  95     s->per_mb_rl_table = 0;
  96     s->mspel= 0;
  97     w->per_mb_abt=0;
  98     w->abt_type=0;
  99     w->j_type=0;
 100
 101     assert(s->flipflop_rounding);
 102
 103     if (s->pict_type == FF_I_TYPE) {
 104         assert(s->no_rounding==1);
 105         if(w->j_type_bit) put_bits(&s->pb, 1, w->j_type);
 106
 107         if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
 108
 109         if(!s->per_mb_rl_table){
 110             ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
 111             ff_msmpeg4_code012(&s->pb, s->rl_table_index);
 112         }
 113
 114         put_bits(&s->pb, 1, s->dc_table_index);
 115
 116         s->inter_intra_pred= 0;
 117     }else{
 118         int cbp_index;
 119
 120         put_bits(&s->pb, 2, SKIP_TYPE_NONE);
 121
 122         ff_msmpeg4_code012(&s->pb, cbp_index=0);
 123         if(s->qscale <= 10){
 124             int map[3]= {0,2,1};
 125             w->cbp_table_index= map[cbp_index];
 126         }else if(s->qscale <= 20){
 127             int map[3]= {1,0,2};
 128             w->cbp_table_index= map[cbp_index];
 129         }else{
 130             int map[3]= {2,1,0};
 131             w->cbp_table_index= map[cbp_index];
 132         }
 133
 134         if(w->mspel_bit) put_bits(&s->pb, 1, s->mspel);
 135
 136         if(w->abt_flag){
 137             put_bits(&s->pb, 1, w->per_mb_abt^1);
 138             if(!w->per_mb_abt){
 139                 ff_msmpeg4_code012(&s->pb, w->abt_type);
 140             }
 141         }
 142
 143         if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
 144
 145         if(!s->per_mb_rl_table){
 146             ff_msmpeg4_code012(&s->pb, s->rl_table_index);
 147             s->rl_chroma_table_index = s->rl_table_index;
 148         }
 149         put_bits(&s->pb, 1, s->dc_table_index);
 150         put_bits(&s->pb, 1, s->mv_table_index);
 151
 152         s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
 153     }
 154     s->esc3_level_length= 0;
 155     s->esc3_run_length= 0;
 156
 157     return 0;
 158 }
 159
 160 /* Nearly identical to wmv1 but that is just because we do not use the
 161  * useless M$ crap features. It is duplicated here in case someone wants
 162  * to add support for these crap features. */
 163 void ff_wmv2_encode_mb(MpegEncContext * s,
 164                        DCTELEM block[6][64],
 165                        int motion_x, int motion_y)
 166 {
 167     Wmv2Context * const w= (Wmv2Context*)s;
 168     int cbp, coded_cbp, i;
 169     int pred_x, pred_y;
 170     uint8_t *coded_block;
 171
 172     ff_msmpeg4_handle_slices(s);
 173
 174     if (!s->mb_intra) {
 175         /* compute cbp */
 176         cbp = 0;
 177         for (i = 0; i < 6; i++) {
 178             if (s->block_last_index[i] >= 0)
 179                 cbp |= 1 << (5 - i);
 180         }
 181
 182         put_bits(&s->pb,
 183                  wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
 184                  wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
 185
 186         /* motion vector */
 187         h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
 188         ff_msmpeg4_encode_motion(s, motion_x - pred_x,
 189                               motion_y - pred_y);
 190     } else {
 191         /* compute cbp */
 192         cbp = 0;
 193         coded_cbp = 0;
 194         for (i = 0; i < 6; i++) {
 195             int val, pred;
 196             val = (s->block_last_index[i] >= 1);
 197             cbp |= val << (5 - i);
 198             if (i < 4) {
 199                 /* predict value for close blocks only for luma */
 200                 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
 201                 *coded_block = val;
 202                 val = val ^ pred;
 203             }
 204             coded_cbp |= val << (5 - i);
 205         }
 206 #if 0
 207         if (coded_cbp)
 208             printf("cbp=%x %x\n", cbp, coded_cbp);
 209 #endif
 210
 211         if (s->pict_type == FF_I_TYPE) {
 212             put_bits(&s->pb,
 213                      ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
 214         } else {
 215             put_bits(&s->pb,
 216                      wmv2_inter_table[w->cbp_table_index][cbp][1],
 217                      wmv2_inter_table[w->cbp_table_index][cbp][0]);
 218         }
 219         put_bits(&s->pb, 1, 0);         /* no AC prediction yet */
 220         if(s->inter_intra_pred){
 221             s->h263_aic_dir=0;
 222             put_bits(&s->pb, table_inter_intra[s->h263_aic_dir][1], table_inter_intra[s->h263_aic_dir][0]);
 223         }
 224     }
 225
 226     for (i = 0; i < 6; i++) {
 227         ff_msmpeg4_encode_block(s, block[i], i);
 228     }
 229 }
 230
 231 AVCodec wmv2_encoder = {
 232     "wmv2",
 233     CODEC_TYPE_VIDEO,
 234     CODEC_ID_WMV2,
 235     sizeof(Wmv2Context),
 236     wmv2_encode_init,
 237     MPV_encode_picture,
 238     MPV_encode_end,
 239     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
 240     .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
 241 };