Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / mpeg4video.h
1 /*
2 * MPEG4 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 typedef struct Mpeg4DecContext {
63 MpegEncContext m;
64
65 /// number of bits to represent the fractional part of time
66 int time_increment_bits;
67 int shape;
68 int vol_sprite_usage;
69 int sprite_brightness_change;
70 int num_sprite_warping_points;
71 /// sprite trajectory points
72 uint16_t sprite_traj[4][2];
73 /// sprite shift [isChroma]
74 int sprite_shift[2];
75
76 // reversible vlc
77 int rvlc;
78 /// could this stream contain resync markers
79 int resync_marker;
80 /// time distance of first I -> B, used for interlaced B-frames
81 int t_frame;
82
83 int new_pred;
84 int enhancement_type;
85 int scalability;
86 int use_intra_dc_vlc;
87
88 /// QP above which the ac VLC should be used for intra dc
89 int intra_dc_threshold;
90
91 /* bug workarounds */
92 int divx_version;
93 int divx_build;
94 int xvid_build;
95 int lavc_build;
96
97 /// flag for having shown the warning about invalid Divx B-frames
98 int showed_packed_warning;
99 /** does the stream contain the low_delay flag,
100 * used to work around buggy encoders. */
101 int vol_control_parameters;
102 int cplx_estimation_trash_i;
103 int cplx_estimation_trash_p;
104 int cplx_estimation_trash_b;
105 } Mpeg4DecContext;
106
107 /* dc encoding for mpeg4 */
108 extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
109 extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];
110
111 extern const uint16_t ff_mpeg4_intra_vlc[103][2];
112 extern const int8_t ff_mpeg4_intra_level[102];
113 extern const int8_t ff_mpeg4_intra_run[102];
114
115 extern RLTable ff_mpeg4_rl_intra;
116
117 /* Note this is identical to the intra rvlc except that it is reordered. */
118 extern RLTable ff_rvlc_rl_inter;
119 extern RLTable ff_rvlc_rl_intra;
120
121 extern const uint16_t ff_sprite_trajectory_tab[15][2];
122 extern const uint8_t ff_mb_type_b_tab[4][2];
123
124 /* these matrixes will be permuted for the idct */
125 extern const int16_t ff_mpeg4_default_intra_matrix[64];
126 extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
127
128 extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
129 extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
130 extern const uint16_t ff_mpeg4_resync_prefix[8];
131
132 extern const uint8_t ff_mpeg4_dc_threshold[8];
133
134 void ff_mpeg4_encode_mb(MpegEncContext *s,
135 int16_t block[6][64],
136 int motion_x, int motion_y);
137 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
138 int dir);
139 void ff_set_mpeg4_time(MpegEncContext *s);
140 void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
141
142 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb);
143 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
144 void ff_mpeg4_clean_buffers(MpegEncContext *s);
145 void ff_mpeg4_stuffing(PutBitContext *pbc);
146 void ff_mpeg4_init_partitions(MpegEncContext *s);
147 void ff_mpeg4_merge_partitions(MpegEncContext *s);
148 void ff_clean_mpeg4_qscales(MpegEncContext *s);
149 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx);
150 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
151 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx);
152 void ff_mpeg4_init_direct_mv(MpegEncContext *s);
153 void ff_mpeg4videodec_static_init(void);
154 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx);
155 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
156
157 /**
158 *
159 * @return the mb_type
160 */
161 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
162
163 extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];
164
165 #if 0 //3IV1 is quite rare and it slows things down a tiny bit
166 #define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
167 #else
168 #define IS_3IV1 0
169 #endif
170
171 /**
172 * Predict the dc.
173 * encoding quantized level -> quantized diff
174 * decoding quantized diff -> quantized level
175 * @param n block index (0-3 are luma, 4-5 are chroma)
176 * @param dir_ptr pointer to an integer where the prediction direction will be stored
177 */
178 static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
179 int *dir_ptr, int encoding)
180 {
181 int a, b, c, wrap, pred, scale, ret;
182 int16_t *dc_val;
183
184 /* find prediction */
185 if (n < 4)
186 scale = s->y_dc_scale;
187 else
188 scale = s->c_dc_scale;
189 if (IS_3IV1)
190 scale = 8;
191
192 wrap = s->block_wrap[n];
193 dc_val = s->dc_val[0] + s->block_index[n];
194
195 /* B C
196 * A X
197 */
198 a = dc_val[-1];
199 b = dc_val[-1 - wrap];
200 c = dc_val[-wrap];
201
202 /* outside slice handling (we can't do that by memset as we need the
203 * dc for error resilience) */
204 if (s->first_slice_line && n != 3) {
205 if (n != 2)
206 b = c = 1024;
207 if (n != 1 && s->mb_x == s->resync_mb_x)
208 b = a = 1024;
209 }
210 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
211 if (n == 0 || n == 4 || n == 5)
212 b = 1024;
213 }
214
215 if (abs(a - b) < abs(b - c)) {
216 pred = c;
217 *dir_ptr = 1; /* top */
218 } else {
219 pred = a;
220 *dir_ptr = 0; /* left */
221 }
222 /* we assume pred is positive */
223 pred = FASTDIV((pred + (scale >> 1)), scale);
224
225 if (encoding) {
226 ret = level - pred;
227 } else {
228 level += pred;
229 ret = level;
230 if (s->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) {
231 if (level < 0) {
232 av_log(s->avctx, AV_LOG_ERROR,
233 "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
234 return -1;
235 }
236 if (level * scale > 2048 + scale) {
237 av_log(s->avctx, AV_LOG_ERROR,
238 "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
239 return -1;
240 }
241 }
242 }
243 level *= scale;
244 if (level & (~2047)) {
245 if (level < 0)
246 level = 0;
247 else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
248 level = 2047;
249 }
250 dc_val[0] = level;
251
252 return ret;
253 }
254
255 #endif /* AVCODEC_MPEG4VIDEO_H */