FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mpeg4video.h
Date: 2022-01-18 10:05:52
Exec Total Coverage
Lines: 31 42 73.8%
Branches: 27 40 67.5%

Line Branch Exec Source
1 /*
2 * MPEG-4 encoder/decoder internal header.
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #ifndef AVCODEC_MPEG4VIDEO_H
24 #define AVCODEC_MPEG4VIDEO_H
25
26 #include <stdint.h>
27
28 #include "get_bits.h"
29 #include "mpegvideo.h"
30
31 // shapes
32 #define RECT_SHAPE 0
33 #define BIN_SHAPE 1
34 #define BIN_ONLY_SHAPE 2
35 #define GRAY_SHAPE 3
36
37 #define SIMPLE_VO_TYPE 1
38 #define CORE_VO_TYPE 3
39 #define MAIN_VO_TYPE 4
40 #define NBIT_VO_TYPE 5
41 #define ARTS_VO_TYPE 10
42 #define ACE_VO_TYPE 12
43 #define SIMPLE_STUDIO_VO_TYPE 14
44 #define CORE_STUDIO_VO_TYPE 15
45 #define ADV_SIMPLE_VO_TYPE 17
46
47 #define VOT_VIDEO_ID 1
48 #define VOT_STILL_TEXTURE_ID 2
49
50 // aspect_ratio_info
51 #define EXTENDED_PAR 15
52
53 //vol_sprite_usage / sprite_enable
54 #define STATIC_SPRITE 1
55 #define GMC_SPRITE 2
56
57 #define MOTION_MARKER 0x1F001
58 #define DC_MARKER 0x6B001
59
60 #define VOS_STARTCODE 0x1B0
61 #define USER_DATA_STARTCODE 0x1B2
62 #define GOP_STARTCODE 0x1B3
63 #define VISUAL_OBJ_STARTCODE 0x1B5
64 #define VOP_STARTCODE 0x1B6
65 #define SLICE_STARTCODE 0x1B7
66 #define EXT_STARTCODE 0x1B8
67
68 #define QUANT_MATRIX_EXT_ID 0x3
69
70 /* smaller packets likely don't contain a real frame */
71 #define MAX_NVOP_SIZE 19
72
73 typedef struct Mpeg4DecContext {
74 MpegEncContext m;
75
76 /// number of bits to represent the fractional part of time
77 int time_increment_bits;
78 int shape;
79 int vol_sprite_usage;
80 int sprite_brightness_change;
81 int num_sprite_warping_points;
82 /// sprite trajectory points
83 uint16_t sprite_traj[4][2];
84 /// sprite shift [isChroma]
85 int sprite_shift[2];
86
87 // reversible vlc
88 int rvlc;
89 /// could this stream contain resync markers
90 int resync_marker;
91 /// time distance of first I -> B, used for interlaced B-frames
92 int t_frame;
93
94 int new_pred;
95 int enhancement_type;
96 int scalability;
97 int use_intra_dc_vlc;
98
99 /// QP above which the ac VLC should be used for intra dc
100 int intra_dc_threshold;
101
102 /* bug workarounds */
103 int divx_version;
104 int divx_build;
105 int xvid_build;
106 int lavc_build;
107
108 /// flag for having shown the warning about invalid Divx B-frames
109 int showed_packed_warning;
110 /** does the stream contain the low_delay flag,
111 * used to work around buggy encoders. */
112 int vol_control_parameters;
113 int cplx_estimation_trash_i;
114 int cplx_estimation_trash_p;
115 int cplx_estimation_trash_b;
116
117 int rgb;
118 } Mpeg4DecContext;
119
120 void ff_mpeg4_encode_mb(MpegEncContext *s,
121 int16_t block[6][64],
122 int motion_x, int motion_y);
123 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
124 int dir);
125 void ff_set_mpeg4_time(MpegEncContext *s);
126 int ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
127
128 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb,
129 int header, int parse_only);
130 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
131 void ff_mpeg4_clean_buffers(MpegEncContext *s);
132 void ff_mpeg4_stuffing(PutBitContext *pbc);
133 void ff_mpeg4_init_partitions(MpegEncContext *s);
134 void ff_mpeg4_merge_partitions(MpegEncContext *s);
135 void ff_clean_mpeg4_qscales(MpegEncContext *s);
136 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx);
137 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
138 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx);
139 int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx);
140 void ff_mpeg4_init_direct_mv(MpegEncContext *s);
141 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx);
142 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
143
144 /**
145 * @return the mb_type
146 */
147 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
148
149 #if 0 //3IV1 is quite rare and it slows things down a tiny bit
150 #define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
151 #else
152 #define IS_3IV1 0
153 #endif
154
155 /**
156 * Predict the dc.
157 * encoding quantized level -> quantized diff
158 * decoding quantized diff -> quantized level
159 * @param n block index (0-3 are luma, 4-5 are chroma)
160 * @param dir_ptr pointer to an integer where the prediction direction will be stored
161 */
162 2297970 static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
163 int *dir_ptr, int encoding)
164 {
165 int a, b, c, wrap, pred, scale, ret;
166 int16_t *dc_val;
167
168 /* find prediction */
169
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2297970 if (n < 4)
170 1531980 scale = s->y_dc_scale;
171 else
172 765990 scale = s->c_dc_scale;
173 if (IS_3IV1)
174 scale = 8;
175
176 2297970 wrap = s->block_wrap[n];
177 2297970 dc_val = s->dc_val[0] + s->block_index[n];
178
179 /* B C
180 * A X
181 */
182 2297970 a = dc_val[-1];
183 2297970 b = dc_val[-1 - wrap];
184 2297970 c = dc_val[-wrap];
185
186 /* outside slice handling (we can't do that by memset as we need the
187 * dc for error resilience) */
188
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2297970 if (s->first_slice_line && n != 3) {
189
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233010 if (n != 2)
190 186408 b = c = 1024;
191
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233010 if (n != 1 && s->mb_x == s->resync_mb_x)
192 9916 b = a = 1024;
193 }
194
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2297970 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
195
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14928 if (n == 0 || n == 4 || n == 5)
196 7464 b = 1024;
197 }
198
199
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2297970 if (abs(a - b) < abs(b - c)) {
200 852290 pred = c;
201 852290 *dir_ptr = 1; /* top */
202 } else {
203 1445680 pred = a;
204 1445680 *dir_ptr = 0; /* left */
205 }
206 /* we assume pred is positive */
207 2297970 pred = FASTDIV((pred + (scale >> 1)), scale);
208
209
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2297970 if (encoding) {
210 1229016 ret = level - pred;
211 } else {
212 1068954 level += pred;
213 1068954 ret = level;
214 }
215 2297970 level *= scale;
216
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2297970 if (level & (~2047)) {
217 if (!s->encoding && (s->avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE))) {
218 if (level < 0) {
219 av_log(s->avctx, AV_LOG_ERROR,
220 "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
221 return AVERROR_INVALIDDATA;
222 }
223 if (level > 2048 + scale) {
224 av_log(s->avctx, AV_LOG_ERROR,
225 "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
226 return AVERROR_INVALIDDATA;
227 }
228 }
229 if (level < 0)
230 level = 0;
231 else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
232 level = 2047;
233 }
234 2297970 dc_val[0] = level;
235
236 2297970 return ret;
237 }
238
239 #endif /* AVCODEC_MPEG4VIDEO_H */
240