FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
wmv2enc.c
Go to the documentation of this file.
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;
63  avctx->extradata= av_mallocz(avctx->extradata_size + 10);
65 
66  return 0;
67 }
68 
70 {
71  Wmv2Context * const w= (Wmv2Context*)s;
72 
73  put_bits(&s->pb, 1, s->pict_type - 1);
74  if(s->pict_type == AV_PICTURE_TYPE_I){
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 
88 
89  if (s->pict_type == AV_PICTURE_TYPE_I) {
90  av_assert0(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){
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){
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. */
150  int16_t 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 
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  ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
170  ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
171 
172  s->misc_bits += get_bits_diff(s);
173  /* motion vector */
174  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
175  ff_msmpeg4_encode_motion(s, motion_x - pred_x,
176  motion_y - pred_y);
177  s->mv_bits += get_bits_diff(s);
178  } else {
179  /* compute cbp */
180  cbp = 0;
181  coded_cbp = 0;
182  for (i = 0; i < 6; i++) {
183  int val, pred;
184  val = (s->block_last_index[i] >= 1);
185  cbp |= val << (5 - i);
186  if (i < 4) {
187  /* predict value for close blocks only for luma */
188  pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
189  *coded_block = val;
190  val = val ^ pred;
191  }
192  coded_cbp |= val << (5 - i);
193  }
194 
195  if (s->pict_type == AV_PICTURE_TYPE_I) {
196  put_bits(&s->pb,
197  ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
198  } else {
199  put_bits(&s->pb,
202  }
203  put_bits(&s->pb, 1, 0); /* no AC prediction yet */
204  if(s->inter_intra_pred){
205  s->h263_aic_dir=0;
207  }
208  s->misc_bits += get_bits_diff(s);
209  }
210 
211  for (i = 0; i < 6; i++) {
212  ff_msmpeg4_encode_block(s, block[i], i);
213  }
214  if (s->mb_intra)
215  s->i_tex_bits += get_bits_diff(s);
216  else
217  s->p_tex_bits += get_bits_diff(s);
218 }
219 
221  .name = "wmv2",
222  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
223  .type = AVMEDIA_TYPE_VIDEO,
224  .id = AV_CODEC_ID_WMV2,
225  .priv_data_size = sizeof(Wmv2Context),
227  .encode2 = ff_MPV_encode_picture,
229  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
230 };