FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mpeg4video.h
Date: 2021-09-16 08:47:15
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 #include "rl.h"
31
32 // shapes
33 #define RECT_SHAPE 0
34 #define BIN_SHAPE 1
35 #define BIN_ONLY_SHAPE 2
36 #define GRAY_SHAPE 3
37
38 #define SIMPLE_VO_TYPE 1
39 #define CORE_VO_TYPE 3
40 #define MAIN_VO_TYPE 4
41 #define NBIT_VO_TYPE 5
42 #define ARTS_VO_TYPE 10
43 #define ACE_VO_TYPE 12
44 #define SIMPLE_STUDIO_VO_TYPE 14
45 #define CORE_STUDIO_VO_TYPE 15
46 #define ADV_SIMPLE_VO_TYPE 17
47
48 #define VOT_VIDEO_ID 1
49 #define VOT_STILL_TEXTURE_ID 2
50
51 // aspect_ratio_info
52 #define EXTENDED_PAR 15
53
54 //vol_sprite_usage / sprite_enable
55 #define STATIC_SPRITE 1
56 #define GMC_SPRITE 2
57
58 #define MOTION_MARKER 0x1F001
59 #define DC_MARKER 0x6B001
60
61 #define VOS_STARTCODE 0x1B0
62 #define USER_DATA_STARTCODE 0x1B2
63 #define GOP_STARTCODE 0x1B3
64 #define VISUAL_OBJ_STARTCODE 0x1B5
65 #define VOP_STARTCODE 0x1B6
66 #define SLICE_STARTCODE 0x1B7
67 #define EXT_STARTCODE 0x1B8
68
69 #define QUANT_MATRIX_EXT_ID 0x3
70
71 /* smaller packets likely don't contain a real frame */
72 #define MAX_NVOP_SIZE 19
73
74 typedef struct Mpeg4DecContext {
75 MpegEncContext m;
76
77 /// number of bits to represent the fractional part of time
78 int time_increment_bits;
79 int shape;
80 int vol_sprite_usage;
81 int sprite_brightness_change;
82 int num_sprite_warping_points;
83 /// sprite trajectory points
84 uint16_t sprite_traj[4][2];
85 /// sprite shift [isChroma]
86 int sprite_shift[2];
87
88 // reversible vlc
89 int rvlc;
90 /// could this stream contain resync markers
91 int resync_marker;
92 /// time distance of first I -> B, used for interlaced B-frames
93 int t_frame;
94
95 int new_pred;
96 int enhancement_type;
97 int scalability;
98 int use_intra_dc_vlc;
99
100 /// QP above which the ac VLC should be used for intra dc
101 int intra_dc_threshold;
102
103 /* bug workarounds */
104 int divx_version;
105 int divx_build;
106 int xvid_build;
107 int lavc_build;
108
109 /// flag for having shown the warning about invalid Divx B-frames
110 int showed_packed_warning;
111 /** does the stream contain the low_delay flag,
112 * used to work around buggy encoders. */
113 int vol_control_parameters;
114 int cplx_estimation_trash_i;
115 int cplx_estimation_trash_p;
116 int cplx_estimation_trash_b;
117
118 int rgb;
119 } Mpeg4DecContext;
120
121 static const uint8_t mpeg4_block_count[4] = {0, 6, 8, 12};
122
123 /* dc encoding for MPEG-4 */
124 extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
125 extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];
126
127 extern const uint16_t ff_mpeg4_intra_vlc[103][2];
128 extern const int8_t ff_mpeg4_intra_level[102];
129 extern const int8_t ff_mpeg4_intra_run[102];
130
131 extern RLTable ff_mpeg4_rl_intra;
132 void ff_mpeg4_init_rl_intra(void);
133
134 /* Note this is identical to the intra rvlc except that it is reordered. */
135 extern RLTable ff_rvlc_rl_inter;
136 extern RLTable ff_rvlc_rl_intra;
137
138 extern const uint8_t ff_sprite_trajectory_lens[15];
139 extern const uint8_t ff_mb_type_b_tab[4][2];
140
141 /* these matrixes will be permuted for the idct */
142 extern const int16_t ff_mpeg4_default_intra_matrix[64];
143 extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
144
145 extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
146 extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
147 extern const uint16_t ff_mpeg4_resync_prefix[8];
148
149 extern const uint8_t ff_mpeg4_dc_threshold[8];
150
151 extern const uint8_t ff_mpeg4_studio_dc_luma[19][2];
152 extern const uint8_t ff_mpeg4_studio_dc_chroma[19][2];
153 extern const uint8_t ff_mpeg4_studio_intra[12][24][2];
154
155 void ff_mpeg4_encode_mb(MpegEncContext *s,
156 int16_t block[6][64],
157 int motion_x, int motion_y);
158 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
159 int dir);
160 void ff_set_mpeg4_time(MpegEncContext *s);
161 int ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
162
163 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb, int header);
164 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
165 void ff_mpeg4_clean_buffers(MpegEncContext *s);
166 void ff_mpeg4_stuffing(PutBitContext *pbc);
167 void ff_mpeg4_init_partitions(MpegEncContext *s);
168 void ff_mpeg4_merge_partitions(MpegEncContext *s);
169 void ff_clean_mpeg4_qscales(MpegEncContext *s);
170 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx);
171 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
172 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx);
173 int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx);
174 void ff_mpeg4_init_direct_mv(MpegEncContext *s);
175 void ff_mpeg4videodec_static_init(void);
176 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx);
177 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
178
179 /**
180 * @return the mb_type
181 */
182 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
183
184 #if 0 //3IV1 is quite rare and it slows things down a tiny bit
185 #define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
186 #else
187 #define IS_3IV1 0
188 #endif
189
190 /**
191 * Predict the dc.
192 * encoding quantized level -> quantized diff
193 * decoding quantized diff -> quantized level
194 * @param n block index (0-3 are luma, 4-5 are chroma)
195 * @param dir_ptr pointer to an integer where the prediction direction will be stored
196 */
197 2274114 static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
198 int *dir_ptr, int encoding)
199 {
200 int a, b, c, wrap, pred, scale, ret;
201 int16_t *dc_val;
202
203 /* find prediction */
204
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2274114 if (n < 4)
205 1516076 scale = s->y_dc_scale;
206 else
207 758038 scale = s->c_dc_scale;
208 if (IS_3IV1)
209 scale = 8;
210
211 2274114 wrap = s->block_wrap[n];
212 2274114 dc_val = s->dc_val[0] + s->block_index[n];
213
214 /* B C
215 * A X
216 */
217 2274114 a = dc_val[-1];
218 2274114 b = dc_val[-1 - wrap];
219 2274114 c = dc_val[-wrap];
220
221 /* outside slice handling (we can't do that by memset as we need the
222 * dc for error resilience) */
223
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2274114 if (s->first_slice_line && n != 3) {
224
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231900 if (n != 2)
225 185520 b = c = 1024;
226
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231900 if (n != 1 && s->mb_x == s->resync_mb_x)
227 9876 b = a = 1024;
228 }
229
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2274114 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
230
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14868 if (n == 0 || n == 4 || n == 5)
231 7434 b = 1024;
232 }
233
234
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2274114 if (abs(a - b) < abs(b - c)) {
235 839990 pred = c;
236 839990 *dir_ptr = 1; /* top */
237 } else {
238 1434124 pred = a;
239 1434124 *dir_ptr = 0; /* left */
240 }
241 /* we assume pred is positive */
242 2274114 pred = FASTDIV((pred + (scale >> 1)), scale);
243
244
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2274114 if (encoding) {
245 1205160 ret = level - pred;
246 } else {
247 1068954 level += pred;
248 1068954 ret = level;
249 }
250 2274114 level *= scale;
251
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2274114 if (level & (~2047)) {
252 if (!s->encoding && (s->avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE))) {
253 if (level < 0) {
254 av_log(s->avctx, AV_LOG_ERROR,
255 "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
256 return AVERROR_INVALIDDATA;
257 }
258 if (level > 2048 + scale) {
259 av_log(s->avctx, AV_LOG_ERROR,
260 "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
261 return AVERROR_INVALIDDATA;
262 }
263 }
264 if (level < 0)
265 level = 0;
266 else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
267 level = 2047;
268 }
269 2274114 dc_val[0] = level;
270
271 2274114 return ret;
272 }
273
274 #endif /* AVCODEC_MPEG4VIDEO_H */
275