FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/wmv2enc.c
Date: 2025-06-23 20:06:14
Exec Total Coverage
Lines: 118 124 95.2%
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 WMV2Context common;
39 int j_type_bit;
40 int j_type;
41 int abt_flag;
42 int abt_type;
43 int per_mb_abt;
44 int mspel_bit;
45 int cbp_table_index;
46 int top_left_mv_flag;
47 int per_mb_rl_bit;
48 } WMV2EncContext;
49
50 4 static int encode_ext_header(WMV2EncContext *w)
51 {
52 4 MPVEncContext *const s = &w->msmpeg4.m.s;
53 PutBitContext pb;
54 int code;
55
56 4 init_put_bits(&pb, s->c.avctx->extradata, WMV2_EXTRADATA_SIZE);
57
58 4 put_bits(&pb, 5, s->c.avctx->time_base.den / s->c.avctx->time_base.num); // yes 29.97 -> 29
59
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 4 put_bits(&pb, 11, FFMIN(w->msmpeg4.m.bit_rate / 1024, 2047));
60
61 4 put_bits(&pb, 1, w->mspel_bit = 1);
62 4 put_bits(&pb, 1, s->c.loop_filter);
63 4 put_bits(&pb, 1, w->abt_flag = 1);
64 4 put_bits(&pb, 1, w->j_type_bit = 1);
65 4 put_bits(&pb, 1, w->top_left_mv_flag = 0);
66 4 put_bits(&pb, 1, w->per_mb_rl_bit = 1);
67 4 put_bits(&pb, 3, code = 1);
68
69 4 flush_put_bits(&pb);
70
71 4 s->c.slice_height = s->c.mb_height / code;
72
73 4 return 0;
74 }
75
76 200 static int wmv2_encode_picture_header(MPVMainEncContext *const m)
77 {
78 200 WMV2EncContext *const w = (WMV2EncContext *) m;
79 200 MSMPEG4EncContext *const ms = &w->msmpeg4;
80 200 MPVEncContext *const s = &m->s;
81
82 200 put_bits_assume_flushed(&s->pb);
83
84 200 put_bits(&s->pb, 1, s->c.pict_type - 1);
85
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 200 if (s->c.pict_type == AV_PICTURE_TYPE_I)
86 20 put_bits(&s->pb, 7, 0);
87 200 put_bits(&s->pb, 5, s->c.qscale);
88
89 200 ms->dc_table_index = 1;
90 200 ms->mv_table_index = 1; /* only if P-frame */
91 200 ms->per_mb_rl_table = 0;
92 200 s->c.mspel = 0;
93 200 w->per_mb_abt = 0;
94 200 w->abt_type = 0;
95 200 w->j_type = 0;
96
97
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 200 av_assert0(s->c.flipflop_rounding);
98
99
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 200 if (s->c.pict_type == AV_PICTURE_TYPE_I) {
100
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 20 av_assert0(s->c.no_rounding == 1);
101
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 20 if (w->j_type_bit)
102 20 put_bits(&s->pb, 1, w->j_type);
103
104
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 20 if (w->per_mb_rl_bit)
105 20 put_bits(&s->pb, 1, ms->per_mb_rl_table);
106
107
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 20 if (!ms->per_mb_rl_table) {
108 20 ff_msmpeg4_code012(&s->pb, ms->rl_chroma_table_index);
109 20 ff_msmpeg4_code012(&s->pb, ms->rl_table_index);
110 }
111
112 20 put_bits(&s->pb, 1, ms->dc_table_index);
113
114 20 s->c.inter_intra_pred = 0;
115 } else {
116 int cbp_index;
117
118 180 put_bits(&s->pb, 2, SKIP_TYPE_NONE);
119
120 180 ff_msmpeg4_code012(&s->pb, cbp_index = 0);
121 180 w->cbp_table_index = wmv2_get_cbp_table_index(&s->c, cbp_index);
122
123
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 180 if (w->mspel_bit)
124 180 put_bits(&s->pb, 1, s->c.mspel);
125
126
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 180 if (w->abt_flag) {
127 180 put_bits(&s->pb, 1, w->per_mb_abt ^ 1);
128
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 180 if (!w->per_mb_abt)
129 180 ff_msmpeg4_code012(&s->pb, w->abt_type);
130 }
131
132
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 180 if (w->per_mb_rl_bit)
133 180 put_bits(&s->pb, 1, ms->per_mb_rl_table);
134
135
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 180 if (!ms->per_mb_rl_table) {
136 180 ff_msmpeg4_code012(&s->pb, ms->rl_table_index);
137 180 ms->rl_chroma_table_index = ms->rl_table_index;
138 }
139 180 put_bits(&s->pb, 1, ms->dc_table_index);
140 180 put_bits(&s->pb, 1, ms->mv_table_index);
141
142 180 s->c.inter_intra_pred = 0; // (s->c.width * s->c.height < 320 * 240 && m->bit_rate <= II_BITRATE);
143 }
144 200 s->esc3_level_length = 0;
145 200 ms->esc3_run_length = 0;
146
147 200 return 0;
148 }
149
150 /* Nearly identical to wmv1 but that is just because we do not use the
151 * useless M$ crap features. It is duplicated here in case someone wants
152 * to add support for these crap features. */
153 59850 static void wmv2_encode_mb(MPVEncContext *const s, int16_t block[][64],
154 int motion_x, int motion_y)
155 {
156 59850 WMV2EncContext *const w = (WMV2EncContext *) s;
157 int cbp, coded_cbp, i;
158 int pred_x, pred_y;
159 uint8_t *coded_block;
160
161 59850 ff_msmpeg4_handle_slices(s);
162
163
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 59850 if (!s->c.mb_intra) {
164 /* compute cbp */
165 51711 cbp = 0;
166
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 361977 for (i = 0; i < 6; i++)
167
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 310266 if (s->c.block_last_index[i] >= 0)
168 109321 cbp |= 1 << (5 - i);
169
170 51711 put_bits(&s->pb,
171 51711 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
172 51711 ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
173
174 51711 s->misc_bits += get_bits_diff(s);
175 /* motion vector */
176 51711 ff_h263_pred_motion(&s->c, 0, 0, &pred_x, &pred_y);
177 51711 ff_msmpeg4_encode_motion(&w->msmpeg4, motion_x - pred_x,
178 motion_y - pred_y);
179 51711 s->mv_bits += get_bits_diff(s);
180 } else {
181 /* compute cbp */
182 8139 cbp = 0;
183 8139 coded_cbp = 0;
184
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 56973 for (i = 0; i < 6; i++) {
185 48834 int val = (s->c.block_last_index[i] >= 1);
186
187 48834 cbp |= val << (5 - i);
188
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 48834 if (i < 4) {
189 /* predict value for close blocks only for luma */
190 32556 int pred = ff_msmpeg4_coded_block_pred(&s->c, i, &coded_block);
191 32556 *coded_block = val;
192 32556 val = val ^ pred;
193 }
194 48834 coded_cbp |= val << (5 - i);
195 }
196
197
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 8139 if (s->c.pict_type == AV_PICTURE_TYPE_I)
198 5985 put_bits(&s->pb,
199 5985 ff_msmp4_mb_i_table[coded_cbp][1],
200 5985 ff_msmp4_mb_i_table[coded_cbp][0]);
201 else
202 2154 put_bits(&s->pb,
203 2154 ff_wmv2_inter_table[w->cbp_table_index][cbp][1],
204 2154 ff_wmv2_inter_table[w->cbp_table_index][cbp][0]);
205 8139 put_bits(&s->pb, 1, 0); /* no AC prediction yet */
206
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 8139 if (s->c.inter_intra_pred) {
207 ✗ s->c.h263_aic_dir = 0;
208 ✗ put_bits(&s->pb,
209 ✗ ff_table_inter_intra[s->c.h263_aic_dir][1],
210 ✗ ff_table_inter_intra[s->c.h263_aic_dir][0]);
211 }
212 8139 s->misc_bits += get_bits_diff(s);
213 }
214
215
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 418950 for (i = 0; i < 6; i++)
216 359100 ff_msmpeg4_encode_block(s, block[i], i);
217
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 59850 if (s->c.mb_intra)
218 8139 s->i_tex_bits += get_bits_diff(s);
219 else
220 51711 s->p_tex_bits += get_bits_diff(s);
221 59850 }
222
223 4 static av_cold int wmv2_encode_init(AVCodecContext *avctx)
224 {
225 4 WMV2EncContext *const w = avctx->priv_data;
226 4 MPVEncContext *const s = &w->msmpeg4.m.s;
227 int ret;
228
229 4 w->msmpeg4.m.encode_picture_header = wmv2_encode_picture_header;
230 4 s->encode_mb = wmv2_encode_mb;
231 4 s->c.private_ctx = &w->common;
232 4 ret = ff_mpv_encode_init(avctx);
233
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 4 if (ret < 0)
234 ✗ return ret;
235
236 4 ff_wmv2_common_init(&s->c);
237
238 4 avctx->extradata_size = WMV2_EXTRADATA_SIZE;
239 4 avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
240
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 4 if (!avctx->extradata)
241 ✗ return AVERROR(ENOMEM);
242
243 4 encode_ext_header(w);
244
245 4 return 0;
246 }
247
248 const FFCodec ff_wmv2_encoder = {
249 .p.name = "wmv2",
250 CODEC_LONG_NAME("Windows Media Video 8"),
251 .p.type = AVMEDIA_TYPE_VIDEO,
252 .p.id = AV_CODEC_ID_WMV2,
253 .p.priv_class = &ff_mpv_enc_class,
254 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
255 .priv_data_size = sizeof(WMV2EncContext),
256 .init = wmv2_encode_init,
257 FF_CODEC_ENCODE_CB(ff_mpv_encode_picture),
258 .close = ff_mpv_encode_end,
259 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
260 .color_ranges = AVCOL_RANGE_MPEG,
261 CODEC_PIXFMTS(AV_PIX_FMT_YUV420P),
262 };
263