FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/wmv2enc.c
Date: 2026-01-16 07:34:38
Exec Total Coverage
Lines: 116 122 95.1%
Functions: 4 4 100.0%
Branches: 34 48 70.8%
Line Branch Exec Source
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 "libavutil/mem.h"
22 #include "avcodec.h"
23 #include "codec_internal.h"
24 #include "h263.h"
25 #include "mpegvideo.h"
26 #include "mpegvideoenc.h"
27 #include "msmpeg4.h"
28 #include "msmpeg4enc.h"
29 #include "msmpeg4data.h"
30 #include "msmpeg4_vc1_data.h"
31 #include "put_bits.h"
32 #include "wmv2.h"
33
34 #define WMV2_EXTRADATA_SIZE 4
35
36 typedef struct WMV2EncContext {
37 MSMPEG4EncContext msmpeg4;
38 int j_type_bit;
39 int j_type;
40 int abt_flag;
41 int abt_type;
42 int per_mb_abt;
43 int mspel_bit;
44 int cbp_table_index;
45 int top_left_mv_flag;
46 int per_mb_rl_bit;
47 } WMV2EncContext;
48
49 4 static int encode_ext_header(WMV2EncContext *w)
50 {
51 4 MPVEncContext *const s = &w->msmpeg4.m.s;
52 PutBitContext pb;
53 int code;
54
55 4 init_put_bits(&pb, s->c.avctx->extradata, WMV2_EXTRADATA_SIZE);
56
57 4 put_bits(&pb, 5, s->c.avctx->time_base.den / s->c.avctx->time_base.num); // yes 29.97 -> 29
58
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 4 put_bits(&pb, 11, FFMIN(w->msmpeg4.m.bit_rate / 1024, 2047));
59
60 4 put_bits(&pb, 1, w->mspel_bit = 1);
61 4 put_bits(&pb, 1, s->loop_filter);
62 4 put_bits(&pb, 1, w->abt_flag = 1);
63 4 put_bits(&pb, 1, w->j_type_bit = 1);
64 4 put_bits(&pb, 1, w->top_left_mv_flag = 0);
65 4 put_bits(&pb, 1, w->per_mb_rl_bit = 1);
66 4 put_bits(&pb, 3, code = 1);
67
68 4 flush_put_bits(&pb);
69
70 4 s->slice_height = s->c.mb_height / code;
71
72 4 return 0;
73 }
74
75 200 static int wmv2_encode_picture_header(MPVMainEncContext *const m)
76 {
77 200 WMV2EncContext *const w = (WMV2EncContext *) m;
78 200 MSMPEG4EncContext *const ms = &w->msmpeg4;
79 200 MPVEncContext *const s = &m->s;
80
81 200 put_bits_assume_flushed(&s->pb);
82
83 200 put_bits(&s->pb, 1, s->c.pict_type - 1);
84
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 200 if (s->c.pict_type == AV_PICTURE_TYPE_I)
85 20 put_bits(&s->pb, 7, 0);
86 200 put_bits(&s->pb, 5, s->c.qscale);
87
88 200 ms->dc_table_index = 1;
89 200 ms->mv_table_index = 1; /* only if P-frame */
90 200 ms->per_mb_rl_table = 0;
91 200 s->c.mspel = 0;
92 200 w->per_mb_abt = 0;
93 200 w->abt_type = 0;
94 200 w->j_type = 0;
95
96
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 200 av_assert0(s->flipflop_rounding);
97
98
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 200 if (s->c.pict_type == AV_PICTURE_TYPE_I) {
99
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 20 av_assert0(s->c.no_rounding == 1);
100
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 20 if (w->j_type_bit)
101 20 put_bits(&s->pb, 1, w->j_type);
102
103
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 20 if (w->per_mb_rl_bit)
104 20 put_bits(&s->pb, 1, ms->per_mb_rl_table);
105
106
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 20 if (!ms->per_mb_rl_table) {
107 20 ff_msmpeg4_code012(&s->pb, ms->rl_chroma_table_index);
108 20 ff_msmpeg4_code012(&s->pb, ms->rl_table_index);
109 }
110
111 20 put_bits(&s->pb, 1, ms->dc_table_index);
112
113 20 s->c.inter_intra_pred = 0;
114 } else {
115 int cbp_index;
116
117 180 put_bits(&s->pb, 2, SKIP_TYPE_NONE);
118
119 180 ff_msmpeg4_code012(&s->pb, cbp_index = 0);
120 180 w->cbp_table_index = wmv2_get_cbp_table_index(s->c.qscale, cbp_index);
121
122
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 180 if (w->mspel_bit)
123 180 put_bits(&s->pb, 1, s->c.mspel);
124
125
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 180 if (w->abt_flag) {
126 180 put_bits(&s->pb, 1, w->per_mb_abt ^ 1);
127
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 180 if (!w->per_mb_abt)
128 180 ff_msmpeg4_code012(&s->pb, w->abt_type);
129 }
130
131
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 180 if (w->per_mb_rl_bit)
132 180 put_bits(&s->pb, 1, ms->per_mb_rl_table);
133
134
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 180 if (!ms->per_mb_rl_table) {
135 180 ff_msmpeg4_code012(&s->pb, ms->rl_table_index);
136 180 ms->rl_chroma_table_index = ms->rl_table_index;
137 }
138 180 put_bits(&s->pb, 1, ms->dc_table_index);
139 180 put_bits(&s->pb, 1, ms->mv_table_index);
140
141 180 s->c.inter_intra_pred = 0; // (s->c.width * s->c.height < 320 * 240 && m->bit_rate <= II_BITRATE);
142 }
143 200 s->esc3_level_length = 0;
144 200 ms->esc3_run_length = 0;
145
146 200 return 0;
147 }
148
149 /* Nearly identical to wmv1 but that is just because we do not use the
150 * useless M$ crap features. It is duplicated here in case someone wants
151 * to add support for these crap features. */
152 59850 static void wmv2_encode_mb(MPVEncContext *const s, int16_t block[][64],
153 int motion_x, int motion_y)
154 {
155 59850 WMV2EncContext *const w = (WMV2EncContext *) s;
156 int cbp, coded_cbp, i;
157 int pred_x, pred_y;
158 uint8_t *coded_block;
159
160 59850 ff_msmpeg4_handle_slices(s);
161
162
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 59850 if (!s->c.mb_intra) {
163 /* compute cbp */
164 51711 cbp = 0;
165
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 361977 for (i = 0; i < 6; i++)
166
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 310266 if (s->c.block_last_index[i] >= 0)
167 109321 cbp |= 1 << (5 - i);
168
169 51711 put_bits(&s->pb,
170 51711 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
171 51711 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
172
173 51711 s->misc_bits += get_bits_diff(s);
174 /* motion vector */
175 51711 ff_h263_pred_motion(&s->c, 0, 0, &pred_x, &pred_y);
176 51711 ff_msmpeg4_encode_motion(&w->msmpeg4, motion_x - pred_x,
177 motion_y - pred_y);
178 51711 s->mv_bits += get_bits_diff(s);
179 } else {
180 /* compute cbp */
181 8139 cbp = 0;
182 8139 coded_cbp = 0;
183
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 56973 for (i = 0; i < 6; i++) {
184 48834 int val = (s->c.block_last_index[i] >= 1);
185
186 48834 cbp |= val << (5 - i);
187
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 48834 if (i < 4) {
188 /* predict value for close blocks only for luma */
189 32556 int pred = ff_msmpeg4_coded_block_pred(&s->c, i, &coded_block);
190 32556 *coded_block = val;
191 32556 val = val ^ pred;
192 }
193 48834 coded_cbp |= val << (5 - i);
194 }
195
196
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 8139 if (s->c.pict_type == AV_PICTURE_TYPE_I)
197 5985 put_bits(&s->pb,
198 5985 ff_msmp4_mb_i_table[coded_cbp][1],
199 5985 ff_msmp4_mb_i_table[coded_cbp][0]);
200 else
201 2154 put_bits(&s->pb,
202 2154 ff_wmv2_inter_table[w->cbp_table_index][cbp][1],
203 2154 ff_wmv2_inter_table[w->cbp_table_index][cbp][0]);
204 8139 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
205
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 8139 if (s->c.inter_intra_pred) {
206 ✗ s->c.h263_aic_dir = 0;
207 ✗ put_bits(&s->pb,
208 ✗ ff_table_inter_intra[s->c.h263_aic_dir][1],
209 ✗ ff_table_inter_intra[s->c.h263_aic_dir][0]);
210 }
211 8139 s->misc_bits += get_bits_diff(s);
212 }
213
214
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 418950 for (i = 0; i < 6; i++)
215 359100 ff_msmpeg4_encode_block(s, block[i], i);
216
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 59850 if (s->c.mb_intra)
217 8139 s->i_tex_bits += get_bits_diff(s);
218 else
219 51711 s->p_tex_bits += get_bits_diff(s);
220 59850 }
221
222 4 static av_cold int wmv2_encode_init(AVCodecContext *avctx)
223 {
224 4 WMV2EncContext *const w = avctx->priv_data;
225 4 MPVEncContext *const s = &w->msmpeg4.m.s;
226 int ret;
227
228 4 w->msmpeg4.m.encode_picture_header = wmv2_encode_picture_header;
229 4 s->encode_mb = wmv2_encode_mb;
230
231 4 ret = ff_mpv_encode_init(avctx);
232
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 4 if (ret < 0)
233 ✗ return ret;
234
235 4 avctx->extradata_size = WMV2_EXTRADATA_SIZE;
236 4 avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
237
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 4 if (!avctx->extradata)
238 ✗ return AVERROR(ENOMEM);
239
240 4 encode_ext_header(w);
241
242 4 return 0;
243 }
244
245 const FFCodec ff_wmv2_encoder = {
246 .p.name = "wmv2",
247 CODEC_LONG_NAME("Windows Media Video 8"),
248 .p.type = AVMEDIA_TYPE_VIDEO,
249 .p.id = AV_CODEC_ID_WMV2,
250 .p.priv_class = &ff_mpv_enc_class,
251 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
252 .priv_data_size = sizeof(WMV2EncContext),
253 .init = wmv2_encode_init,
254 FF_CODEC_ENCODE_CB(ff_mpv_encode_picture),
255 .close = ff_mpv_encode_end,
256 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
257 .color_ranges = AVCOL_RANGE_MPEG,
258 CODEC_PIXFMTS(AV_PIX_FMT_YUV420P),
259 };
260