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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 "h263.h"
23 #include "mpegvideo.h"
24 #include "msmpeg4.h"
25 #include "msmpeg4data.h"
26 #include "wmv2.h"
27 
28 
30 {
31  MpegEncContext *const s = &w->s;
32  PutBitContext pb;
33  int code;
34 
36 
37  put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); // yes 29.97 -> 29
38  put_bits(&pb, 11, FFMIN(s->bit_rate / 1024, 2047));
39 
40  put_bits(&pb, 1, w->mspel_bit = 1);
41  put_bits(&pb, 1, s->loop_filter);
42  put_bits(&pb, 1, w->abt_flag = 1);
43  put_bits(&pb, 1, w->j_type_bit = 1);
44  put_bits(&pb, 1, w->top_left_mv_flag = 0);
45  put_bits(&pb, 1, w->per_mb_rl_bit = 1);
46  put_bits(&pb, 3, code = 1);
47 
48  flush_put_bits(&pb);
49 
50  s->slice_height = s->mb_height / code;
51 
52  return 0;
53 }
54 
56 {
57  Wmv2Context *const w = avctx->priv_data;
58 
59  if (ff_mpv_encode_init(avctx) < 0)
60  return -1;
61 
63 
64  avctx->extradata_size = 4;
66  if (!avctx->extradata)
67  return AVERROR(ENOMEM);
69 
70  return 0;
71 }
72 
74 {
75  Wmv2Context *const w = (Wmv2Context *) s;
76 
77  put_bits(&s->pb, 1, s->pict_type - 1);
78  if (s->pict_type == AV_PICTURE_TYPE_I)
79  put_bits(&s->pb, 7, 0);
80  put_bits(&s->pb, 5, s->qscale);
81 
82  s->dc_table_index = 1;
83  s->mv_table_index = 1; /* only if P frame */
84  s->per_mb_rl_table = 0;
85  s->mspel = 0;
86  w->per_mb_abt = 0;
87  w->abt_type = 0;
88  w->j_type = 0;
89 
91 
92  if (s->pict_type == AV_PICTURE_TYPE_I) {
93  av_assert0(s->no_rounding == 1);
94  if (w->j_type_bit)
95  put_bits(&s->pb, 1, w->j_type);
96 
97  if (w->per_mb_rl_bit)
98  put_bits(&s->pb, 1, s->per_mb_rl_table);
99 
100  if (!s->per_mb_rl_table) {
103  }
104 
105  put_bits(&s->pb, 1, s->dc_table_index);
106 
107  s->inter_intra_pred = 0;
108  } else {
109  int cbp_index;
110 
111  put_bits(&s->pb, 2, SKIP_TYPE_NONE);
112 
113  ff_msmpeg4_code012(&s->pb, cbp_index = 0);
114  w->cbp_table_index = wmv2_get_cbp_table_index(s, cbp_index);
115 
116  if (w->mspel_bit)
117  put_bits(&s->pb, 1, s->mspel);
118 
119  if (w->abt_flag) {
120  put_bits(&s->pb, 1, w->per_mb_abt ^ 1);
121  if (!w->per_mb_abt)
122  ff_msmpeg4_code012(&s->pb, w->abt_type);
123  }
124 
125  if (w->per_mb_rl_bit)
126  put_bits(&s->pb, 1, s->per_mb_rl_table);
127 
128  if (!s->per_mb_rl_table) {
131  }
132  put_bits(&s->pb, 1, s->dc_table_index);
133  put_bits(&s->pb, 1, s->mv_table_index);
134 
135  s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
136  }
137  s->esc3_level_length = 0;
138  s->esc3_run_length = 0;
139 
140  return 0;
141 }
142 
143 /* Nearly identical to wmv1 but that is just because we do not use the
144  * useless M$ crap features. It is duplicated here in case someone wants
145  * to add support for these crap features. */
146 void ff_wmv2_encode_mb(MpegEncContext *s, int16_t block[6][64],
147  int motion_x, int motion_y)
148 {
149  Wmv2Context *const w = (Wmv2Context *) s;
150  int cbp, coded_cbp, i;
151  int pred_x, pred_y;
152  uint8_t *coded_block;
153 
155 
156  if (!s->mb_intra) {
157  /* compute cbp */
158  cbp = 0;
159  for (i = 0; i < 6; i++)
160  if (s->block_last_index[i] >= 0)
161  cbp |= 1 << (5 - i);
162 
163  put_bits(&s->pb,
164  ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
165  ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
166 
167  s->misc_bits += get_bits_diff(s);
168  /* motion vector */
169  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
170  ff_msmpeg4_encode_motion(s, motion_x - pred_x,
171  motion_y - pred_y);
172  s->mv_bits += get_bits_diff(s);
173  } else {
174  /* compute cbp */
175  cbp = 0;
176  coded_cbp = 0;
177  for (i = 0; i < 6; i++) {
178  int val, pred;
179  val = (s->block_last_index[i] >= 1);
180  cbp |= val << (5 - i);
181  if (i < 4) {
182  /* predict value for close blocks only for luma */
183  pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
184  *coded_block = val;
185  val = val ^ pred;
186  }
187  coded_cbp |= val << (5 - i);
188  }
189 
190  if (s->pict_type == AV_PICTURE_TYPE_I)
191  put_bits(&s->pb,
192  ff_msmp4_mb_i_table[coded_cbp][1],
193  ff_msmp4_mb_i_table[coded_cbp][0]);
194  else
195  put_bits(&s->pb,
198  put_bits(&s->pb, 1, 0); /* no AC prediction yet */
199  if (s->inter_intra_pred) {
200  s->h263_aic_dir = 0;
201  put_bits(&s->pb,
204  }
205  s->misc_bits += get_bits_diff(s);
206  }
207 
208  for (i = 0; i < 6; i++)
209  ff_msmpeg4_encode_block(s, block[i], i);
210  if (s->mb_intra)
211  s->i_tex_bits += get_bits_diff(s);
212  else
213  s->p_tex_bits += get_bits_diff(s);
214 }
215 
217 
219  .name = "wmv2",
220  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
221  .type = AVMEDIA_TYPE_VIDEO,
222  .id = AV_CODEC_ID_WMV2,
223  .priv_data_size = sizeof(Wmv2Context),
225  .encode2 = ff_mpv_encode_picture,
226  .close = ff_mpv_encode_end,
227  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
228  AV_PIX_FMT_NONE },
229  .priv_class = &wmv2_class,
230 };