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wmv2enc.c
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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 "mpegvideo.h"
23 #include "msmpeg4.h"
24 #include "msmpeg4data.h"
25 #include "h263.h"
26 #include "wmv2.h"
27 
28 
30  MpegEncContext * const s= &w->s;
31  PutBitContext pb;
32  int code;
33 
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 
55  Wmv2Context * const w= avctx->priv_data;
56 
57  if (ff_mpv_encode_init(avctx) < 0)
58  return -1;
59 
61 
62  avctx->extradata_size= 4;
64  if (!avctx->extradata)
65  return AVERROR(ENOMEM);
67 
68  return 0;
69 }
70 
72 {
73  Wmv2Context * const w= (Wmv2Context*)s;
74 
75  put_bits(&s->pb, 1, s->pict_type - 1);
76  if(s->pict_type == AV_PICTURE_TYPE_I){
77  put_bits(&s->pb, 7, 0);
78  }
79  put_bits(&s->pb, 5, s->qscale);
80 
81  s->dc_table_index = 1;
82  s->mv_table_index = 1; /* only if P frame */
83  s->per_mb_rl_table = 0;
84  s->mspel= 0;
85  w->per_mb_abt=0;
86  w->abt_type=0;
87  w->j_type=0;
88 
90 
91  if (s->pict_type == AV_PICTURE_TYPE_I) {
92  av_assert0(s->no_rounding==1);
93  if(w->j_type_bit) put_bits(&s->pb, 1, w->j_type);
94 
95  if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
96 
97  if(!s->per_mb_rl_table){
100  }
101 
102  put_bits(&s->pb, 1, s->dc_table_index);
103 
104  s->inter_intra_pred= 0;
105  }else{
106  int cbp_index;
107 
108  put_bits(&s->pb, 2, SKIP_TYPE_NONE);
109 
110  ff_msmpeg4_code012(&s->pb, cbp_index=0);
111  if(s->qscale <= 10){
112  int map[3]= {0,2,1};
113  w->cbp_table_index= map[cbp_index];
114  }else if(s->qscale <= 20){
115  int map[3]= {1,0,2};
116  w->cbp_table_index= map[cbp_index];
117  }else{
118  int map[3]= {2,1,0};
119  w->cbp_table_index= map[cbp_index];
120  }
121 
122  if(w->mspel_bit) put_bits(&s->pb, 1, s->mspel);
123 
124  if(w->abt_flag){
125  put_bits(&s->pb, 1, w->per_mb_abt^1);
126  if(!w->per_mb_abt){
127  ff_msmpeg4_code012(&s->pb, w->abt_type);
128  }
129  }
130 
131  if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
132 
133  if(!s->per_mb_rl_table){
136  }
137  put_bits(&s->pb, 1, s->dc_table_index);
138  put_bits(&s->pb, 1, s->mv_table_index);
139 
140  s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
141  }
142  s->esc3_level_length= 0;
143  s->esc3_run_length= 0;
144 
145  return 0;
146 }
147 
148 /* Nearly identical to wmv1 but that is just because we do not use the
149  * useless M$ crap features. It is duplicated here in case someone wants
150  * to add support for these crap features. */
152  int16_t block[6][64],
153  int motion_x, int motion_y)
154 {
155  Wmv2Context * const w= (Wmv2Context*)s;
156  int cbp, coded_cbp, i;
157  int pred_x, pred_y;
158  uint8_t *coded_block;
159 
161 
162  if (!s->mb_intra) {
163  /* compute cbp */
164  cbp = 0;
165  for (i = 0; i < 6; i++) {
166  if (s->block_last_index[i] >= 0)
167  cbp |= 1 << (5 - i);
168  }
169 
170  put_bits(&s->pb,
171  ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
172  ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
173 
174  s->misc_bits += get_bits_diff(s);
175  /* motion vector */
176  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
177  ff_msmpeg4_encode_motion(s, motion_x - pred_x,
178  motion_y - pred_y);
179  s->mv_bits += get_bits_diff(s);
180  } else {
181  /* compute cbp */
182  cbp = 0;
183  coded_cbp = 0;
184  for (i = 0; i < 6; i++) {
185  int val, pred;
186  val = (s->block_last_index[i] >= 1);
187  cbp |= val << (5 - i);
188  if (i < 4) {
189  /* predict value for close blocks only for luma */
190  pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
191  *coded_block = val;
192  val = val ^ pred;
193  }
194  coded_cbp |= val << (5 - i);
195  }
196 
197  if (s->pict_type == AV_PICTURE_TYPE_I) {
198  put_bits(&s->pb,
199  ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
200  } else {
201  put_bits(&s->pb,
204  }
205  put_bits(&s->pb, 1, 0); /* no AC prediction yet */
206  if(s->inter_intra_pred){
207  s->h263_aic_dir=0;
209  }
210  s->misc_bits += get_bits_diff(s);
211  }
212 
213  for (i = 0; i < 6; i++) {
214  ff_msmpeg4_encode_block(s, block[i], i);
215  }
216  if (s->mb_intra)
217  s->i_tex_bits += get_bits_diff(s);
218  else
219  s->p_tex_bits += get_bits_diff(s);
220 }
221 
223  .name = "wmv2",
224  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
225  .type = AVMEDIA_TYPE_VIDEO,
226  .id = AV_CODEC_ID_WMV2,
227  .priv_data_size = sizeof(Wmv2Context),
229  .encode2 = ff_mpv_encode_picture,
231  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
232 };