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
133 /* Note this is identical to the intra rvlc except that it is reordered. */
134 extern RLTable ff_rvlc_rl_inter;
135 extern RLTable ff_rvlc_rl_intra;
136
137 extern const uint8_t ff_sprite_trajectory_lens[15];
138 extern const uint8_t ff_mb_type_b_tab[4][2];
139
140 /* these matrixes will be permuted for the idct */
141 extern const int16_t ff_mpeg4_default_intra_matrix[64];
142 extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
143
144 extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
145 extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
146 extern const uint16_t ff_mpeg4_resync_prefix[8];
147
148 extern const uint8_t ff_mpeg4_dc_threshold[8];
149
150 extern const uint8_t ff_mpeg4_studio_dc_luma[19][2];
151 extern const uint8_t ff_mpeg4_studio_dc_chroma[19][2];
152 extern const uint8_t ff_mpeg4_studio_intra[12][24][2];
153
154 void ff_mpeg4_encode_mb(MpegEncContext *s,
155 int16_t block[6][64],
156 int motion_x, int motion_y);
157 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
158 int dir);
159 void ff_set_mpeg4_time(MpegEncContext *s);
160 int ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
161
162 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb, int header);
163 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
164 void ff_mpeg4_clean_buffers(MpegEncContext *s);
165 void ff_mpeg4_stuffing(PutBitContext *pbc);
166 void ff_mpeg4_init_partitions(MpegEncContext *s);
167 void ff_mpeg4_merge_partitions(MpegEncContext *s);
168 void ff_clean_mpeg4_qscales(MpegEncContext *s);
169 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx);
170 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
171 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx);
172 int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx);
173 void ff_mpeg4_init_direct_mv(MpegEncContext *s);
174 void ff_mpeg4videodec_static_init(void);
175 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx);
176 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
177
178 /**
179 * @return the mb_type
180 */
181 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
182
183 extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];
184
185 #if 0 //3IV1 is quite rare and it slows things down a tiny bit
186 #define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
187 #else
188 #define IS_3IV1 0
189 #endif
190
191 /**
192 * Predict the dc.
193 * encoding quantized level -> quantized diff
194 * decoding quantized diff -> quantized level
195 * @param n block index (0-3 are luma, 4-5 are chroma)
196 * @param dir_ptr pointer to an integer where the prediction direction will be stored
197 */
ff_mpeg4_pred_dc(MpegEncContext * s,int n,int level,int * dir_ptr,int encoding)198 static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
199 int *dir_ptr, int encoding)
200 {
201 int a, b, c, wrap, pred, scale, ret;
202 int16_t *dc_val;
203
204 /* find prediction */
205 if (n < 4)
206 scale = s->y_dc_scale;
207 else
208 scale = s->c_dc_scale;
209 if (IS_3IV1)
210 scale = 8;
211
212 wrap = s->block_wrap[n];
213 dc_val = s->dc_val[0] + s->block_index[n];
214
215 /* B C
216 * A X
217 */
218 a = dc_val[-1];
219 b = dc_val[-1 - wrap];
220 c = dc_val[-wrap];
221
222 /* outside slice handling (we can't do that by memset as we need the
223 * dc for error resilience) */
224 if (s->first_slice_line && n != 3) {
225 if (n != 2)
226 b = c = 1024;
227 if (n != 1 && s->mb_x == s->resync_mb_x)
228 b = a = 1024;
229 }
230 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
231 if (n == 0 || n == 4 || n == 5)
232 b = 1024;
233 }
234
235 if (abs(a - b) < abs(b - c)) {
236 pred = c;
237 *dir_ptr = 1; /* top */
238 } else {
239 pred = a;
240 *dir_ptr = 0; /* left */
241 }
242 /* we assume pred is positive */
243 pred = FASTDIV((pred + (scale >> 1)), scale);
244
245 if (encoding) {
246 ret = level - pred;
247 } else {
248 level += pred;
249 ret = level;
250 }
251 level *= scale;
252 if (level & (~2047)) {
253 if (!s->encoding && (s->avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE))) {
254 if (level < 0) {
255 av_log(s->avctx, AV_LOG_ERROR,
256 "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
257 return AVERROR_INVALIDDATA;
258 }
259 if (level > 2048 + scale) {
260 av_log(s->avctx, AV_LOG_ERROR,
261 "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
262 return AVERROR_INVALIDDATA;
263 }
264 }
265 if (level < 0)
266 level = 0;
267 else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
268 level = 2047;
269 }
270 dc_val[0] = level;
271
272 return ret;
273 }
274
275 #endif /* AVCODEC_MPEG4VIDEO_H */
276