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path: root/libavcodec/wmv2enc.c (plain)
blob: 74ae12bbf749db3bba241eec6bf1c57303096826
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 + AV_INPUT_BUFFER_PADDING_SIZE);
66 if (!avctx->extradata)
67 return AVERROR(ENOMEM);
68
69 encode_ext_header(w);
70
71 return 0;
72}
73
74int ff_wmv2_encode_picture_header(MpegEncContext *s, int picture_number)
75{
76 Wmv2Context *const w = (Wmv2Context *) s;
77
78 put_bits(&s->pb, 1, s->pict_type - 1);
79 if (s->pict_type == AV_PICTURE_TYPE_I)
80 put_bits(&s->pb, 7, 0);
81 put_bits(&s->pb, 5, s->qscale);
82
83 s->dc_table_index = 1;
84 s->mv_table_index = 1; /* only if P-frame */
85 s->per_mb_rl_table = 0;
86 s->mspel = 0;
87 w->per_mb_abt = 0;
88 w->abt_type = 0;
89 w->j_type = 0;
90
91 av_assert0(s->flipflop_rounding);
92
93 if (s->pict_type == AV_PICTURE_TYPE_I) {
94 av_assert0(s->no_rounding == 1);
95 if (w->j_type_bit)
96 put_bits(&s->pb, 1, w->j_type);
97
98 if (w->per_mb_rl_bit)
99 put_bits(&s->pb, 1, s->per_mb_rl_table);
100
101 if (!s->per_mb_rl_table) {
102 ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
103 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
104 }
105
106 put_bits(&s->pb, 1, s->dc_table_index);
107
108 s->inter_intra_pred = 0;
109 } else {
110 int cbp_index;
111
112 put_bits(&s->pb, 2, SKIP_TYPE_NONE);
113
114 ff_msmpeg4_code012(&s->pb, cbp_index = 0);
115 w->cbp_table_index = wmv2_get_cbp_table_index(s, cbp_index);
116
117 if (w->mspel_bit)
118 put_bits(&s->pb, 1, s->mspel);
119
120 if (w->abt_flag) {
121 put_bits(&s->pb, 1, w->per_mb_abt ^ 1);
122 if (!w->per_mb_abt)
123 ff_msmpeg4_code012(&s->pb, w->abt_type);
124 }
125
126 if (w->per_mb_rl_bit)
127 put_bits(&s->pb, 1, s->per_mb_rl_table);
128
129 if (!s->per_mb_rl_table) {
130 ff_msmpeg4_code012(&s->pb, s->rl_table_index);
131 s->rl_chroma_table_index = s->rl_table_index;
132 }
133 put_bits(&s->pb, 1, s->dc_table_index);
134 put_bits(&s->pb, 1, s->mv_table_index);
135
136 s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
137 }
138 s->esc3_level_length = 0;
139 s->esc3_run_length = 0;
140
141 return 0;
142}
143
144/* Nearly identical to wmv1 but that is just because we do not use the
145 * useless M$ crap features. It is duplicated here in case someone wants
146 * to add support for these crap features. */
147void ff_wmv2_encode_mb(MpegEncContext *s, int16_t block[6][64],
148 int motion_x, int motion_y)
149{
150 Wmv2Context *const w = (Wmv2Context *) s;
151 int cbp, coded_cbp, i;
152 int pred_x, pred_y;
153 uint8_t *coded_block;
154
155 ff_msmpeg4_handle_slices(s);
156
157 if (!s->mb_intra) {
158 /* compute cbp */
159 cbp = 0;
160 for (i = 0; i < 6; i++)
161 if (s->block_last_index[i] >= 0)
162 cbp |= 1 << (5 - i);
163
164 put_bits(&s->pb,
165 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
166 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
167
168 s->misc_bits += get_bits_diff(s);
169 /* motion vector */
170 ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
171 ff_msmpeg4_encode_motion(s, motion_x - pred_x,
172 motion_y - pred_y);
173 s->mv_bits += get_bits_diff(s);
174 } else {
175 /* compute cbp */
176 cbp = 0;
177 coded_cbp = 0;
178 for (i = 0; i < 6; i++) {
179 int val, pred;
180 val = (s->block_last_index[i] >= 1);
181 cbp |= val << (5 - i);
182 if (i < 4) {
183 /* predict value for close blocks only for luma */
184 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
185 *coded_block = val;
186 val = val ^ pred;
187 }
188 coded_cbp |= val << (5 - i);
189 }
190
191 if (s->pict_type == AV_PICTURE_TYPE_I)
192 put_bits(&s->pb,
193 ff_msmp4_mb_i_table[coded_cbp][1],
194 ff_msmp4_mb_i_table[coded_cbp][0]);
195 else
196 put_bits(&s->pb,
197 ff_wmv2_inter_table[w->cbp_table_index][cbp][1],
198 ff_wmv2_inter_table[w->cbp_table_index][cbp][0]);
199 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
200 if (s->inter_intra_pred) {
201 s->h263_aic_dir = 0;
202 put_bits(&s->pb,
203 ff_table_inter_intra[s->h263_aic_dir][1],
204 ff_table_inter_intra[s->h263_aic_dir][0]);
205 }
206 s->misc_bits += get_bits_diff(s);
207 }
208
209 for (i = 0; i < 6; i++)
210 ff_msmpeg4_encode_block(s, block[i], i);
211 if (s->mb_intra)
212 s->i_tex_bits += get_bits_diff(s);
213 else
214 s->p_tex_bits += get_bits_diff(s);
215}
216
217static const AVClass wmv2_class = {
218 .class_name = "wmv2 encoder",
219 .item_name = av_default_item_name,
220 .option = ff_mpv_generic_options,
221 .version = LIBAVUTIL_VERSION_INT,
222};
223
224AVCodec ff_wmv2_encoder = {
225 .name = "wmv2",
226 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
227 .type = AVMEDIA_TYPE_VIDEO,
228 .id = AV_CODEC_ID_WMV2,
229 .priv_data_size = sizeof(Wmv2Context),
230 .priv_class = &wmv2_class,
231 .init = wmv2_encode_init,
232 .encode2 = ff_mpv_encode_picture,
233 .close = ff_mpv_encode_end,
234 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
235 AV_PIX_FMT_NONE },
236};
237
generated by cgit at 2024-05-17 04:59:47 (GMT)