Libav
mpeg4video.h
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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 Libav.
7  *
8  * Libav 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  * Libav 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 Libav; 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 {
64 
67  int shape;
72  uint16_t sprite_traj[4][2];
74  int sprite_shift[2];
75 
76  // reversible vlc
77  int rvlc;
81  int t_frame;
82 
83  int new_pred;
89 
90  /* bug workarounds */
104 
105 /* dc encoding for mpeg4 */
106 extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
107 extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];
108 
109 extern const uint16_t ff_mpeg4_intra_vlc[103][2];
110 extern const int8_t ff_mpeg4_intra_level[102];
111 extern const int8_t ff_mpeg4_intra_run[102];
112 
114 
115 /* Note this is identical to the intra rvlc except that it is reordered. */
118 
119 extern const uint16_t ff_sprite_trajectory_tab[15][2];
120 extern const uint8_t ff_mb_type_b_tab[4][2];
121 
122 /* these matrixes will be permuted for the idct */
123 extern const int16_t ff_mpeg4_default_intra_matrix[64];
124 extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
125 
126 extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
127 extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
128 extern const uint16_t ff_mpeg4_resync_prefix[8];
129 
130 extern const uint8_t ff_mpeg4_dc_threshold[8];
131 
133  int16_t block[6][64],
134  int motion_x, int motion_y);
135 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
136  int dir);
138 void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
139 
151 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
152 
157 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
158 
160 
161 #if 0 //3IV1 is quite rare and it slows things down a tiny bit
162 #define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
163 #else
164 #define IS_3IV1 0
165 #endif
166 
174 static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
175  int *dir_ptr, int encoding)
176 {
177  int a, b, c, wrap, pred, scale, ret;
178  int16_t *dc_val;
179 
180  /* find prediction */
181  if (n < 4)
182  scale = s->y_dc_scale;
183  else
184  scale = s->c_dc_scale;
185  if (IS_3IV1)
186  scale = 8;
187 
188  wrap = s->block_wrap[n];
189  dc_val = s->dc_val[0] + s->block_index[n];
190 
191  /* B C
192  * A X
193  */
194  a = dc_val[-1];
195  b = dc_val[-1 - wrap];
196  c = dc_val[-wrap];
197 
198  /* outside slice handling (we can't do that by memset as we need the
199  * dc for error resilience) */
200  if (s->first_slice_line && n != 3) {
201  if (n != 2)
202  b = c = 1024;
203  if (n != 1 && s->mb_x == s->resync_mb_x)
204  b = a = 1024;
205  }
206  if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
207  if (n == 0 || n == 4 || n == 5)
208  b = 1024;
209  }
210 
211  if (abs(a - b) < abs(b - c)) {
212  pred = c;
213  *dir_ptr = 1; /* top */
214  } else {
215  pred = a;
216  *dir_ptr = 0; /* left */
217  }
218  /* we assume pred is positive */
219  pred = FASTDIV((pred + (scale >> 1)), scale);
220 
221  if (encoding) {
222  ret = level - pred;
223  } else {
224  level += pred;
225  ret = level;
226  if (s->err_recognition & AV_EF_BITSTREAM) {
227  if (level < 0) {
229  "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
230  return -1;
231  }
232  if (level * scale > 2048 + scale) {
234  "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
235  return -1;
236  }
237  }
238  }
239  level *= scale;
240  if (level & (~2047)) {
241  if (level < 0)
242  level = 0;
243  else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
244  level = 2047;
245  }
246  dc_val[0] = level;
247 
248  return ret;
249 }
250 
251 #endif /* AVCODEC_MPEG4VIDEO_H */
uint16_t sprite_traj[4][2]
sprite trajectory points
Definition: mpeg4video.h:72
int sprite_brightness_change
Definition: mpeg4video.h:69
int resync_marker
could this stream contain resync markers
Definition: mpeg4video.h:79
const int8_t ff_mpeg4_intra_level[102]
Definition: mpeg4data.h:77
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
mpegvideo header.
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s)
Definition: mpeg4video.c:30
RLTable.
Definition: rl.h:38
const uint16_t ff_mpeg4_resync_prefix[8]
Definition: mpeg4data.h:368
int block_wrap[6]
Definition: mpegvideo.h:416
int cplx_estimation_trash_b
Definition: mpeg4video.h:102
void ff_mpeg4_merge_partitions(MpegEncContext *s)
int vol_sprite_usage
Definition: mpeg4video.h:68
uint8_t
const int16_t ff_mpeg4_default_non_intra_matrix[64]
Definition: mpeg4data.h:348
uint8_t ff_mpeg4_static_rl_table_store[3][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: mpeg4video.c:28
#define IS_3IV1
Definition: mpeg4video.h:164
#define b
Definition: input.c:52
int enhancement_type
Definition: mpeg4video.h:84
void ff_mpeg4_encode_video_packet_header(MpegEncContext *s)
int cplx_estimation_trash_p
Definition: mpeg4video.h:101
void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number)
bitstream reader API header.
RLTable ff_rvlc_rl_inter
Definition: mpeg4data.h:214
int intra_dc_threshold
QP above which the ac VLC should be used for intra dc.
Definition: mpeg4video.h:88
#define MAX_LEVEL
Definition: rl.h:35
static int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, int *dir_ptr, int encoding)
Predict the dc.
Definition: mpeg4video.h:174
MpegEncContext m
Definition: mpeg4video.h:63
int16_t * dc_val[3]
used for mpeg4 DC prediction, all 3 arrays must be continuous
Definition: mpegvideo.h:313
const uint16_t ff_mpeg4_intra_vlc[103][2]
Definition: mpeg4data.h:47
const uint8_t ff_mpeg4_DCtab_chrom[13][2]
Definition: mpeg4data.h:41
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
const uint8_t ff_mpeg4_DCtab_lum[13][2]
Definition: mpeg4data.h:35
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
Predict the ac.
Definition: mpeg4videodec.c:57
#define wrap(func)
Definition: neontest.h:62
const uint8_t ff_mpeg4_c_dc_scale_table[32]
Definition: mpeg4data.h:363
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
Decode the next video packet.
rl header.
void ff_mpeg4_clean_buffers(MpegEncContext *s)
Definition: mpeg4video.c:45
const uint16_t ff_sprite_trajectory_tab[15][2]
Definition: mpeg4data.h:326
int resync_mb_x
x position of last resync marker
Definition: mpegvideo.h:472
int err_recognition
Definition: mpegvideo.h:477
void ff_clean_mpeg4_qscales(MpegEncContext *s)
modify mb_type & qscale so that encoding is acually possible in mpeg4
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
Decode mpeg4 headers.
int use_intra_dc_vlc
Definition: mpeg4video.h:86
const uint8_t ff_mpeg4_dc_threshold[8]
Definition: mpeg4data.h:372
int vol_control_parameters
does the stream contain the low_delay flag, used to work around buggy encoders.
Definition: mpeg4video.h:99
const uint8_t ff_mb_type_b_tab[4][2]
Definition: mpeg4data.h:332
int block_index[6]
index to current MB in block based arrays with edges
Definition: mpegvideo.h:415
static const float pred[4]
Definition: siprdata.h:259
int first_slice_line
used in mpeg4 too to handle resync markers
Definition: mpegvideo.h:546
main external API structure.
Definition: avcodec.h:1050
int cplx_estimation_trash_i
Definition: mpeg4video.h:100
#define FASTDIV(a, b)
Definition: mathops.h:199
#define AV_EF_BITSTREAM
Definition: avcodec.h:2415
RLTable ff_rvlc_rl_intra
Definition: mpeg4data.h:318
int showed_packed_warning
flag for having shown the warning about invalid Divx B-frames
Definition: mpeg4video.h:96
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
Decode the first and second partition.
const int16_t ff_mpeg4_default_intra_matrix[64]
Definition: mpeg4data.h:337
#define FF_BUG_DC_CLIP
Definition: avcodec.h:2325
void ff_set_mpeg4_time(MpegEncContext *s)
int sprite_shift[2]
sprite shift [isChroma]
Definition: mpeg4video.h:74
RLTable ff_mpeg4_rl_intra
Definition: mpeg4data.h:109
uint8_t level
Definition: svq3.c:147
MpegEncContext.
Definition: mpegvideo.h:204
#define MAX_RUN
Definition: rl.h:34
struct AVCodecContext * avctx
Definition: mpegvideo.h:221
int t_frame
time distance of first I -> B, used for interlaced B-frames
Definition: mpeg4video.h:81
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:81
const int8_t ff_mpeg4_intra_run[102]
Definition: mpeg4data.h:93
const uint8_t ff_mpeg4_y_dc_scale_table[32]
Definition: mpeg4data.h:359
void ff_mpeg4_stuffing(PutBitContext *pbc)
add mpeg4 stuffing bits (01...1)
void ff_mpeg4_init_partitions(MpegEncContext *s)
int resync_mb_y
y position of last resync marker
Definition: mpegvideo.h:473
void ff_mpeg4_encode_mb(MpegEncContext *s, int16_t block[6][64], int motion_x, int motion_y)
int time_increment_bits
number of bits to represent the fractional part of time
Definition: mpeg4video.h:66
int workaround_bugs
workaround bugs in encoders which cannot be detected automatically
Definition: mpegvideo.h:244
int num_sprite_warping_points
Definition: mpeg4video.h:70
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my)
Definition: mpeg4video.c:127
static int16_t block[64]
Definition: dct-test.c:88