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 int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number)
  70 {
  71     Wmv2Context * const w= (Wmv2Context*)s;
  72
  73     put_bits(&s->pb, 1, s->pict_type - 1);
  74     if(s->pict_type == FF_I_TYPE){
  75         put_bits(&s->pb, 7, 0);
  76     }
  77     put_bits(&s->pb, 5, s->qscale);
  78
  79     s->dc_table_index = 1;
  80     s->mv_table_index = 1; /* only if P frame */
  81     s->per_mb_rl_table = 0;
  82     s->mspel= 0;
  83     w->per_mb_abt=0;
  84     w->abt_type=0;
  85     w->j_type=0;
  86
  87     assert(s->flipflop_rounding);
  88
  89     if (s->pict_type == FF_I_TYPE) {
  90         assert(s->no_rounding==1);
  91         if(w->j_type_bit) put_bits(&s->pb, 1, w->j_type);
  92
  93         if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
  94
  95         if(!s->per_mb_rl_table){
  96             ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
  97             ff_msmpeg4_code012(&s->pb, s->rl_table_index);
  98         }
  99
 100         put_bits(&s->pb, 1, s->dc_table_index);
 101
 102         s->inter_intra_pred= 0;
 103     }else{
 104         int cbp_index;
 105
 106         put_bits(&s->pb, 2, SKIP_TYPE_NONE);
 107
 108         ff_msmpeg4_code012(&s->pb, cbp_index=0);
 109         if(s->qscale <= 10){
 110             int map[3]= {0,2,1};
 111             w->cbp_table_index= map[cbp_index];
 112         }else if(s->qscale <= 20){
 113             int map[3]= {1,0,2};
 114             w->cbp_table_index= map[cbp_index];
 115         }else{
 116             int map[3]= {2,1,0};
 117             w->cbp_table_index= map[cbp_index];
 118         }
 119
 120         if(w->mspel_bit) put_bits(&s->pb, 1, s->mspel);
 121
 122         if(w->abt_flag){
 123             put_bits(&s->pb, 1, w->per_mb_abt^1);
 124             if(!w->per_mb_abt){
 125                 ff_msmpeg4_code012(&s->pb, w->abt_type);
 126             }
 127         }
 128
 129         if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
 130
 131         if(!s->per_mb_rl_table){
 132             ff_msmpeg4_code012(&s->pb, s->rl_table_index);
 133             s->rl_chroma_table_index = s->rl_table_index;
 134         }
 135         put_bits(&s->pb, 1, s->dc_table_index);
 136         put_bits(&s->pb, 1, s->mv_table_index);
 137
 138         s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
 139     }
 140     s->esc3_level_length= 0;
 141     s->esc3_run_length= 0;
 142
 143     return 0;
 144 }
 145
 146 /* Nearly identical to wmv1 but that is just because we do not use the
 147  * useless M$ crap features. It is duplicated here in case someone wants
 148  * to add support for these crap features. */
 149 void ff_wmv2_encode_mb(MpegEncContext * s,
 150                        DCTELEM block[6][64],
 151                        int motion_x, int motion_y)
 152 {
 153     Wmv2Context * const w= (Wmv2Context*)s;
 154     int cbp, coded_cbp, i;
 155     int pred_x, pred_y;
 156     uint8_t *coded_block;
 157
 158     ff_msmpeg4_handle_slices(s);
 159
 160     if (!s->mb_intra) {
 161         /* compute cbp */
 162         cbp = 0;
 163         for (i = 0; i < 6; i++) {
 164             if (s->block_last_index[i] >= 0)
 165                 cbp |= 1 << (5 - i);
 166         }
 167
 168         put_bits(&s->pb,
 169                  wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
 170                  wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
 171
 172         /* motion vector */
 173         h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
 174         ff_msmpeg4_encode_motion(s, motion_x - pred_x,
 175                               motion_y - pred_y);
 176     } else {
 177         /* compute cbp */
 178         cbp = 0;
 179         coded_cbp = 0;
 180         for (i = 0; i < 6; i++) {
 181             int val, pred;
 182             val = (s->block_last_index[i] >= 1);
 183             cbp |= val << (5 - i);
 184             if (i < 4) {
 185                 /* predict value for close blocks only for luma */
 186                 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
 187                 *coded_block = val;
 188                 val = val ^ pred;
 189             }
 190             coded_cbp |= val << (5 - i);
 191         }
 192
 193         if (s->pict_type == FF_I_TYPE) {
 194             put_bits(&s->pb,
 195                      ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
 196         } else {
 197             put_bits(&s->pb,
 198                      wmv2_inter_table[w->cbp_table_index][cbp][1],
 199                      wmv2_inter_table[w->cbp_table_index][cbp][0]);
 200         }
 201         put_bits(&s->pb, 1, 0);         /* no AC prediction yet */
 202         if(s->inter_intra_pred){
 203             s->h263_aic_dir=0;
 204             put_bits(&s->pb, table_inter_intra[s->h263_aic_dir][1], table_inter_intra[s->h263_aic_dir][0]);
 205         }
 206     }
 207
 208     for (i = 0; i < 6; i++) {
 209         ff_msmpeg4_encode_block(s, block[i], i);
 210     }
 211 }
 212
 213 AVCodec wmv2_encoder = {
 214     "wmv2",
 215     CODEC_TYPE_VIDEO,
 216     CODEC_ID_WMV2,
 217     sizeof(Wmv2Context),
 218     wmv2_encode_init,
 219     MPV_encode_picture,
 220     MPV_encode_end,
 221     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
 222     .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
 223 };