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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 ADV_SIMPLE_VO_TYPE 17
45
46// aspect_ratio_info
47#define EXTENDED_PAR 15
48
49//vol_sprite_usage / sprite_enable
50#define STATIC_SPRITE 1
51#define GMC_SPRITE 2
52
53#define MOTION_MARKER 0x1F001
54#define DC_MARKER 0x6B001
55
56#define VOS_STARTCODE 0x1B0
57#define USER_DATA_STARTCODE 0x1B2
58#define GOP_STARTCODE 0x1B3
59#define VISUAL_OBJ_STARTCODE 0x1B5
60#define VOP_STARTCODE 0x1B6
61
62/* smaller packets likely don't contain a real frame */
63#define MAX_NVOP_SIZE 19
64
65typedef struct Mpeg4DecContext {
66 MpegEncContext m;
67
68 /// number of bits to represent the fractional part of time
69 int time_increment_bits;
70 int shape;
71 int vol_sprite_usage;
72 int sprite_brightness_change;
73 int num_sprite_warping_points;
74 /// sprite trajectory points
75 uint16_t sprite_traj[4][2];
76 /// sprite shift [isChroma]
77 int sprite_shift[2];
78
79 // reversible vlc
80 int rvlc;
81 /// could this stream contain resync markers
82 int resync_marker;
83 /// time distance of first I -> B, used for interlaced B-frames
84 int t_frame;
85
86 int new_pred;
87 int enhancement_type;
88 int scalability;
89 int use_intra_dc_vlc;
90
91 /// QP above which the ac VLC should be used for intra dc
92 int intra_dc_threshold;
93
94 /* bug workarounds */
95 int divx_version;
96 int divx_build;
97 int xvid_build;
98 int lavc_build;
99
100 /// flag for having shown the warning about invalid Divx B-frames
101 int showed_packed_warning;
102 /** does the stream contain the low_delay flag,
103 * used to work around buggy encoders. */
104 int vol_control_parameters;
105 int cplx_estimation_trash_i;
106 int cplx_estimation_trash_p;
107 int cplx_estimation_trash_b;
108} Mpeg4DecContext;
109
110/* dc encoding for MPEG-4 */
111extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
112extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];
113
114extern const uint16_t ff_mpeg4_intra_vlc[103][2];
115extern const int8_t ff_mpeg4_intra_level[102];
116extern const int8_t ff_mpeg4_intra_run[102];
117
118extern RLTable ff_mpeg4_rl_intra;
119
120/* Note this is identical to the intra rvlc except that it is reordered. */
121extern RLTable ff_rvlc_rl_inter;
122extern RLTable ff_rvlc_rl_intra;
123
124extern const uint16_t ff_sprite_trajectory_tab[15][2];
125extern const uint8_t ff_mb_type_b_tab[4][2];
126
127/* these matrixes will be permuted for the idct */
128extern const int16_t ff_mpeg4_default_intra_matrix[64];
129extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
130
131extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
132extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
133extern const uint16_t ff_mpeg4_resync_prefix[8];
134
135extern const uint8_t ff_mpeg4_dc_threshold[8];
136
137void ff_mpeg4_encode_mb(MpegEncContext *s,
138 int16_t block[6][64],
139 int motion_x, int motion_y);
140void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
141 int dir);
142void ff_set_mpeg4_time(MpegEncContext *s);
143int ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
144
145int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb);
146void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
147void ff_mpeg4_clean_buffers(MpegEncContext *s);
148void ff_mpeg4_stuffing(PutBitContext *pbc);
149void ff_mpeg4_init_partitions(MpegEncContext *s);
150void ff_mpeg4_merge_partitions(MpegEncContext *s);
151void ff_clean_mpeg4_qscales(MpegEncContext *s);
152int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx);
153int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
154int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx);
155void ff_mpeg4_init_direct_mv(MpegEncContext *s);
156void ff_mpeg4videodec_static_init(void);
157int ff_mpeg4_workaround_bugs(AVCodecContext *avctx);
158int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
159
160/**
161 * @return the mb_type
162 */
163int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
164
165extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];
166
167#if 0 //3IV1 is quite rare and it slows things down a tiny bit
168#define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
169#else
170#define IS_3IV1 0
171#endif
172
173/**
174 * Predict the dc.
175 * encoding quantized level -> quantized diff
176 * decoding quantized diff -> quantized level
177 * @param n block index (0-3 are luma, 4-5 are chroma)
178 * @param dir_ptr pointer to an integer where the prediction direction will be stored
179 */
180static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
181 int *dir_ptr, int encoding)
182{
183 int a, b, c, wrap, pred, scale, ret;
184 int16_t *dc_val;
185
186 /* find prediction */
187 if (n < 4)
188 scale = s->y_dc_scale;
189 else
190 scale = s->c_dc_scale;
191 if (IS_3IV1)
192 scale = 8;
193
194 wrap = s->block_wrap[n];
195 dc_val = s->dc_val[0] + s->block_index[n];
196
197 /* B C
198 * A X
199 */
200 a = dc_val[-1];
201 b = dc_val[-1 - wrap];
202 c = dc_val[-wrap];
203
204 /* outside slice handling (we can't do that by memset as we need the
205 * dc for error resilience) */
206 if (s->first_slice_line && n != 3) {
207 if (n != 2)
208 b = c = 1024;
209 if (n != 1 && s->mb_x == s->resync_mb_x)
210 b = a = 1024;
211 }
212 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
213 if (n == 0 || n == 4 || n == 5)
214 b = 1024;
215 }
216
217 if (abs(a - b) < abs(b - c)) {
218 pred = c;
219 *dir_ptr = 1; /* top */
220 } else {
221 pred = a;
222 *dir_ptr = 0; /* left */
223 }
224 /* we assume pred is positive */
225 pred = FASTDIV((pred + (scale >> 1)), scale);
226
227 if (encoding) {
228 ret = level - pred;
229 } else {
230 level += pred;
231 ret = level;
232 }
233 level *= scale;
234 if (level & (~2047)) {
235 if (!s->encoding && (s->avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE))) {
236 if (level < 0) {
237 av_log(s->avctx, AV_LOG_ERROR,
238 "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
239 return -1;
240 }
241 if (level > 2048 + scale) {
242 av_log(s->avctx, AV_LOG_ERROR,
243 "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
244 return -1;
245 }
246 }
247 if (level < 0)
248 level = 0;
249 else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
250 level = 2047;
251 }
252 dc_val[0] = level;
253
254 return ret;
255}
256
257#endif /* AVCODEC_MPEG4VIDEO_H */
258
generated by cgit at 2024-05-17 04:14:00 (GMT)