Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / 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
29static int encode_ext_header(Wmv2Context *w)
30{
31 MpegEncContext *const s = &w->s;
32 PutBitContext pb;
33 int code;
34
35 init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
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
55static av_cold int wmv2_encode_init(AVCodecContext *avctx)
56{
57 Wmv2Context *const w = avctx->priv_data;
58
59 if (ff_mpv_encode_init(avctx) < 0)
60 return -1;
61
62 ff_wmv2_common_init(w);
63
64 avctx->extradata_size = 4;
65 avctx->extradata = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
66 if (!avctx->extradata)
67 return AVERROR(ENOMEM);
68 encode_ext_header(w);
69
70 return 0;
71}
72
73int ff_wmv2_encode_picture_header(MpegEncContext *s, int picture_number)
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
90 av_assert0(s->flipflop_rounding);
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) {
101 ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
102 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
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 if (s->qscale <= 10) {
115 int map[3] = { 0, 2, 1 };
116 w->cbp_table_index = map[cbp_index];
117 } else if (s->qscale <= 20) {
118 int map[3] = { 1, 0, 2 };
119 w->cbp_table_index = map[cbp_index];
120 } else {
121 int map[3] = { 2, 1, 0 };
122 w->cbp_table_index = map[cbp_index];
123 }
124
125 if (w->mspel_bit)
126 put_bits(&s->pb, 1, s->mspel);
127
128 if (w->abt_flag) {
129 put_bits(&s->pb, 1, w->per_mb_abt ^ 1);
130 if (!w->per_mb_abt)
131 ff_msmpeg4_code012(&s->pb, w->abt_type);
132 }
133
134 if (w->per_mb_rl_bit)
135 put_bits(&s->pb, 1, s->per_mb_rl_table);
136
137 if (!s->per_mb_rl_table) {
138 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
139 s->rl_chroma_table_index = s->rl_table_index;
140 }
141 put_bits(&s->pb, 1, s->dc_table_index);
142 put_bits(&s->pb, 1, s->mv_table_index);
143
144 s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
145 }
146 s->esc3_level_length = 0;
147 s->esc3_run_length = 0;
148
149 return 0;
150}
151
152/* Nearly identical to wmv1 but that is just because we do not use the
153 * useless M$ crap features. It is duplicated here in case someone wants
154 * to add support for these crap features. */
155void ff_wmv2_encode_mb(MpegEncContext *s, int16_t block[6][64],
156 int motion_x, int motion_y)
157{
158 Wmv2Context *const w = (Wmv2Context *) s;
159 int cbp, coded_cbp, i;
160 int pred_x, pred_y;
161 uint8_t *coded_block;
162
163 ff_msmpeg4_handle_slices(s);
164
165 if (!s->mb_intra) {
166 /* compute cbp */
167 cbp = 0;
168 for (i = 0; i < 6; i++)
169 if (s->block_last_index[i] >= 0)
170 cbp |= 1 << (5 - i);
171
172 put_bits(&s->pb,
173 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
174 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
175
176 s->misc_bits += get_bits_diff(s);
177 /* motion vector */
178 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
179 ff_msmpeg4_encode_motion(s, motion_x - pred_x,
180 motion_y - pred_y);
181 s->mv_bits += get_bits_diff(s);
182 } else {
183 /* compute cbp */
184 cbp = 0;
185 coded_cbp = 0;
186 for (i = 0; i < 6; i++) {
187 int val, pred;
188 val = (s->block_last_index[i] >= 1);
189 cbp |= val << (5 - i);
190 if (i < 4) {
191 /* predict value for close blocks only for luma */
192 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
193 *coded_block = val;
194 val = val ^ pred;
195 }
196 coded_cbp |= val << (5 - i);
197 }
198
199 if (s->pict_type == AV_PICTURE_TYPE_I)
200 put_bits(&s->pb,
201 ff_msmp4_mb_i_table[coded_cbp][1],
202 ff_msmp4_mb_i_table[coded_cbp][0]);
203 else
204 put_bits(&s->pb,
205 ff_wmv2_inter_table[w->cbp_table_index][cbp][1],
206 ff_wmv2_inter_table[w->cbp_table_index][cbp][0]);
207 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
208 if (s->inter_intra_pred) {
209 s->h263_aic_dir = 0;
210 put_bits(&s->pb,
211 ff_table_inter_intra[s->h263_aic_dir][1],
212 ff_table_inter_intra[s->h263_aic_dir][0]);
213 }
214 s->misc_bits += get_bits_diff(s);
215 }
216
217 for (i = 0; i < 6; i++)
218 ff_msmpeg4_encode_block(s, block[i], i);
219 if (s->mb_intra)
220 s->i_tex_bits += get_bits_diff(s);
221 else
222 s->p_tex_bits += get_bits_diff(s);
223}
224
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225FF_MPV_GENERIC_CLASS(wmv2)
226
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227AVCodec ff_wmv2_encoder = {
228 .name = "wmv2",
229 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
230 .type = AVMEDIA_TYPE_VIDEO,
231 .id = AV_CODEC_ID_WMV2,
232 .priv_data_size = sizeof(Wmv2Context),
233 .init = wmv2_encode_init,
234 .encode2 = ff_mpv_encode_picture,
235 .close = ff_mpv_encode_end,
236 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
237 AV_PIX_FMT_NONE },
f6fa7814 238 .priv_class = &wmv2_class,
2ba45a60 239};