FFmpeg  2.1.1
vp8.h
Go to the documentation of this file.
1 /*
2  * VP8 compatible video decoder
3  *
4  * Copyright (C) 2010 David Conrad
5  * Copyright (C) 2010 Ronald S. Bultje
6  * Copyright (C) 2010 Jason Garrett-Glaser
7  * Copyright (C) 2012 Daniel Kang
8  *
9  * This file is part of FFmpeg.
10  *
11  * FFmpeg is free software; you can redistribute it and/or
12  * modify it under the terms of the GNU Lesser General Public
13  * License as published by the Free Software Foundation; either
14  * version 2.1 of the License, or (at your option) any later version.
15  *
16  * FFmpeg is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19  * Lesser General Public License for more details.
20  *
21  * You should have received a copy of the GNU Lesser General Public
22  * License along with FFmpeg; if not, write to the Free Software
23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24  */
25 
26 #ifndef AVCODEC_VP8_H
27 #define AVCODEC_VP8_H
28 
29 #include "libavutil/buffer.h"
30 
31 #include "vp56.h"
32 #include "vp8dsp.h"
33 #include "h264pred.h"
34 #include "thread.h"
35 #if HAVE_PTHREADS
36 #include <pthread.h>
37 #elif HAVE_OS2THREADS
38 #include "compat/os2threads.h"
39 #elif HAVE_W32THREADS
40 #include "compat/w32pthreads.h"
41 #endif
42 
43 #define VP8_MAX_QUANT 127
44 
45 enum dct_token {
58 
60 };
61 
62 // used to signal 4x4 intra pred in luma MBs
63 #define MODE_I4x4 4
64 
69 };
70 
72  VP8_SPLITMVMODE_16x8 = 0, ///< 2 16x8 blocks (vertical)
73  VP8_SPLITMVMODE_8x16, ///< 2 8x16 blocks (horizontal)
74  VP8_SPLITMVMODE_8x8, ///< 2x2 blocks of 8x8px each
75  VP8_SPLITMVMODE_4x4, ///< 4x4 blocks of 4x4px each
76  VP8_SPLITMVMODE_NONE, ///< (only used in prediction) no split MVs
77 };
78 
79 typedef struct VP8FilterStrength {
84 
85 typedef struct VP8Macroblock {
87  // todo: make it possible to check for at least (i4x4 or split_mv)
88  // in one op. are others needed?
97  VP56mv bmv[16];
99 
100 typedef struct VP8ThreadData {
101  DECLARE_ALIGNED(16, int16_t, block)[6][4][16];
102  DECLARE_ALIGNED(16, int16_t, block_dc)[16];
103  /**
104  * This is the index plus one of the last non-zero coeff
105  * for each of the blocks in the current macroblock.
106  * So, 0 -> no coeffs
107  * 1 -> dc-only (special transform)
108  * 2+-> full transform
109  */
111  /**
112  * For coeff decode, we need to know whether the above block had non-zero
113  * coefficients. This means for each macroblock, we need data for 4 luma
114  * blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9
115  * per macroblock. We keep the last row in top_nnz.
116  */
119 #if HAVE_THREADS
120  pthread_mutex_t lock;
121  pthread_cond_t cond;
122 #endif
123  int thread_mb_pos; // (mb_y << 16) | (mb_x & 0xFFFF)
124  int wait_mb_pos; // What the current thread is waiting on.
127 } VP8ThreadData;
128 
129 typedef struct VP8Frame {
132 } VP8Frame;
133 
134 #define MAX_THREADS 8
135 typedef struct VP8Context {
142 
143  uint16_t mb_width; /* number of horizontal MB */
144  uint16_t mb_height; /* number of vertical MB */
145  int linesize;
147 
154 
155  int8_t sign_bias[4]; ///< one state [0, 1] per ref frame type
156  int ref_count[3];
157 
158  /**
159  * Base parameters for segmentation, i.e. per-macroblock parameters.
160  * These must be kept unchanged even if segmentation is not used for
161  * a frame, since the values persist between interframes.
162  */
163  struct {
167  int8_t base_quant[4];
168  int8_t filter_level[4]; ///< base loop filter level
169  } segmentation;
170 
171  struct {
175  } filter;
176 
178 
181 
182  /**
183  * Macroblocks can have one of 4 different quants in a frame when
184  * segmentation is enabled.
185  * If segmentation is disabled, only the first segment's values are used.
186  */
187  struct {
188  // [0] - DC qmul [1] - AC qmul
189  int16_t luma_qmul[2];
190  int16_t luma_dc_qmul[2]; ///< luma dc-only block quant
191  int16_t chroma_qmul[2];
192  } qmat[4];
193 
194  struct {
195  uint8_t enabled; ///< whether each mb can have a different strength based on mode/ref
196 
197  /**
198  * filter strength adjustment for the following macroblock modes:
199  * [0-3] - i16x16 (always zero)
200  * [4] - i4x4
201  * [5] - zero mv
202  * [6] - inter modes except for zero or split mv
203  * [7] - split mv
204  * i16x16 modes never have any adjustment
205  */
207 
208  /**
209  * filter strength adjustment for macroblocks that reference:
210  * [0] - intra / VP56_FRAME_CURRENT
211  * [1] - VP56_FRAME_PREVIOUS
212  * [2] - VP56_FRAME_GOLDEN
213  * [3] - altref / VP56_FRAME_GOLDEN2
214  */
215  int8_t ref[4];
216  } lf_delta;
217 
218  uint8_t (*top_border)[16+8+8];
220 
221  VP56RangeCoder c; ///< header context, includes mb modes and motion vectors
222 
223  /**
224  * These are all of the updatable probabilities for binary decisions.
225  * They are only implictly reset on keyframes, making it quite likely
226  * for an interframe to desync if a prior frame's header was corrupt
227  * or missing outright!
228  */
229  struct {
238  uint8_t mvc[2][19];
239  } prob[2];
240 
243  int update_last; ///< update VP56_FRAME_PREVIOUS with the current one
244  int update_golden; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so
246 
247  /**
248  * If this flag is not set, all the probability updates
249  * are discarded after this frame is decoded.
250  */
252 
253  /**
254  * All coefficients are contained in separate arith coding contexts.
255  * There can be 1, 2, 4, or 8 of these after the header context.
256  */
264 
265  int num_jobs;
266  /**
267  * This describes the macroblock memory layout.
268  * 0 -> Only width+height*2+1 macroblocks allocated (frame/single thread).
269  * 1 -> Macroblocks for entire frame alloced (sliced thread).
270  */
272 } VP8Context;
273 
275 
276 int ff_vp8_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
277  AVPacket *avpkt);
278 
280 
281 #endif /* AVCODEC_VP8_H */
uint8_t golden
Definition: vp8.h:234
Definition: vp8.h:48
uint8_t inner_limit
Definition: vp8.h:81
VP8Macroblock * macroblocks
Definition: vp8.h:177
Definition: vp8.h:56
Definition: vp8.h:49
(only used in prediction) no split MVs
Definition: vp8.h:76
VP56mv mv_min
Definition: vp8.h:152
VP5 and VP6 compatible video decoder (common features)
int8_t sign_bias[4]
one state [0, 1] per ref frame type
Definition: vp8.h:155
uint8_t * intra4x4_pred_mode_top
Definition: vp8.h:179
uint8_t mbskip_enabled
Definition: vp8.h:150
uint8_t token[4][16][3][NUM_DCT_TOKENS-1]
Definition: vp8.h:237
int linesize
Definition: vp8.h:145
#define DECLARE_ALIGNED(n, t, v)
Definition: avcodec.h:5102
os2threads to pthreads wrapper
VP56mv bmv[16]
Definition: vp8.h:97
uint8_t inner_filter
Definition: vp8.h:82
uint8_t segmentid[3]
Definition: vp8.h:230
uint8_t sharpness
Definition: vp8.h:174
2 16x8 blocks (vertical)
Definition: vp8.h:72
int update_probabilities
If this flag is not set, all the probability updates are discarded after this frame is decoded...
Definition: vp8.h:251
VP8Frame * framep[4]
Definition: vp8.h:138
inter_mvmode
Definition: vp8.h:65
uint8_t(* top_nnz)[9]
Definition: vp8.h:219
int num_jobs
Definition: vp8.h:265
uint8_t pred16x16[4]
Definition: vp8.h:235
uint8_t update_map
Definition: vp8.h:166
uint16_t mb_height
Definition: vp8.h:144
int update_golden
VP56_FRAME_NONE if not updated, or which frame to copy if so.
Definition: vp8.h:244
uint8_t intra4x4_pred_mode_top[4]
Definition: vp8.h:95
HMTX pthread_mutex_t
Definition: os2threads.h:38
uint8_t
Definition: vp8.h:46
mode
Definition: f_perms.c:27
uint8_t ref_frame
Definition: vp8.h:90
Multithreading support functions.
Definition: vp8.h:54
VP8 compatible video decoder.
int ff_vp8_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: vp8.c:1863
uint8_t mvc[2][19]
Definition: vp8.h:238
VP56mv mv
Definition: vp8.h:96
int8_t base_quant[4]
Definition: vp8.h:167
Context for storing H.264 prediction functions.
Definition: h264pred.h:92
int update_last
update VP56_FRAME_PREVIOUS with the current one
Definition: vp8.h:243
const char data[16]
Definition: mxf.c:68
VP8Frame * prev_frame
Definition: vp8.h:141
int num_coeff_partitions
All coefficients are contained in separate arith coding contexts.
Definition: vp8.h:257
vp8_mc_func put_pixels_tab[3][3][3]
Definition: vp8.h:262
uint8_t intra4x4_pred_mode_mb[16]
Definition: vp8.h:94
uint8_t intra4x4_pred_mode_left[4]
Definition: vp8.h:180
uint8_t edge_emu_buffer[21 *32]
Definition: vp8.h:125
H264PredContext hpc
Definition: vp8.h:261
Definition: vp8.h:129
uint8_t absolute_vals
Definition: vp8.h:165
uint16_t mb_width
Definition: vp8.h:143
uint8_t last
Definition: vp8.h:233
uint8_t mode
Definition: vp8.h:89
AVCodecContext * avctx
Definition: vp8.h:137
VideoDSPContext vdsp
Definition: vp8.h:259
VP8Macroblock * macroblocks_base
Definition: vp8.h:241
Definition: vp8.h:51
int16_t block[6][4][16]
Definition: vp8.h:101
uint8_t keyframe
Definition: vp8.h:148
int16_t luma_qmul[2]
Definition: vp8.h:189
struct VP8Context::@93 lf_delta
4x4 blocks of 4x4px each
Definition: vp8.h:75
uint8_t deblock_filter
Definition: vp8.h:149
int16_t block_dc[16]
Definition: vp8.h:102
uint8_t mbskip
Definition: vp8.h:231
int8_t ref[4]
filter strength adjustment for macroblocks that reference: [0] - intra / VP56_FRAME_CURRENT [1] - VP5...
Definition: vp8.h:215
void(* vp8_mc_func)(uint8_t *dst, ptrdiff_t dstStride, uint8_t *src, ptrdiff_t srcStride, int h, int x, int y)
Definition: vp8dsp.h:33
int16_t luma_dc_qmul[2]
luma dc-only block quant
Definition: vp8.h:190
int16_t chroma_qmul[2]
Definition: vp8.h:191
uint8_t(* top_border)[16+8+8]
Definition: vp8.h:218
ThreadFrame tf
Definition: vp8.h:130
uint8_t segment
Definition: vp8.h:93
Definition: vp8.h:53
VP8Frame * curframe
Definition: vp8.h:140
uint8_t simple
Definition: vp8.h:172
VP8Frame frames[5]
Definition: vp8.h:263
uint8_t level
Definition: vp8.h:173
AVBufferRef * seg_map
Definition: vp8.h:131
Definition: vp8.h:57
main external API structure.
Definition: avcodec.h:1146
VP8Frame * next_framep[4]
Definition: vp8.h:139
int mb_layout
This describes the macroblock memory layout.
Definition: vp8.h:271
uint8_t left_nnz[9]
For coeff decode, we need to know whether the above block had non-zero coefficients.
Definition: vp8.h:117
VP56RangeCoder c
header context, includes mb modes and motion vectors
Definition: vp8.h:221
VP56RangeCoder coeff_partition[8]
Definition: vp8.h:258
struct VP8Context::@94 prob[2]
These are all of the updatable probabilities for binary decisions.
VP8FilterStrength * filter_strength
Definition: vp8.h:126
uint8_t enabled
whether each mb can have a different strength based on mode/ref
Definition: vp8.h:164
dct_token
Definition: vp8.h:45
Definition: vp8.h:55
int uvlinesize
Definition: vp8.h:146
VP56mv mv_max
Definition: vp8.h:153
Definition: vp8.h:47
H.264 / AVC / MPEG4 prediction functions.
Definition: vp56.h:66
av_cold int ff_vp8_decode_init(AVCodecContext *avctx)
Definition: vp8.c:2037
int update_altref
Definition: vp8.h:245
2 8x16 blocks (horizontal)
Definition: vp8.h:73
av_cold int ff_vp8_decode_free(AVCodecContext *avctx)
Definition: vp8.c:2014
uint8_t pred8x8c[3]
Definition: vp8.h:236
A reference to a data buffer.
Definition: buffer.h:81
Definition: vp8.h:50
uint8_t partitioning
Definition: vp8.h:91
int wait_mb_pos
Definition: vp8.h:124
struct VP8Context::@91 filter
uint8_t chroma_pred_mode
Definition: vp8.h:92
Definition: vp8.h:52
int invisible
Definition: vp8.h:242
int ref_count[3]
Definition: vp8.h:156
#define MODE_I4x4
Definition: vp8.h:63
VP8DSPContext vp8dsp
Definition: vp8.h:260
int thread_nr
Definition: vp8.h:118
struct VP8Context::@90 segmentation
Base parameters for segmentation, i.e.
inter_splitmvmode
Definition: vp8.h:71
w32threads to pthreads wrapper
int8_t filter_level[4]
base loop filter level
Definition: vp8.h:168
uint8_t intra
Definition: vp8.h:232
struct VP8Context::@92 qmat[4]
Macroblocks can have one of 4 different quants in a frame when segmentation is enabled.
uint8_t non_zero_count_cache[6][4]
This is the index plus one of the last non-zero coeff for each of the blocks in the current macrobloc...
Definition: vp8.h:110
uint8_t skip
Definition: vp8.h:86
This structure stores compressed data.
Definition: avcodec.h:1040
uint8_t profile
Definition: vp8.h:151
VP8ThreadData * thread_data
Definition: vp8.h:136
int thread_mb_pos
Definition: vp8.h:123
2x2 blocks of 8x8px each
Definition: vp8.h:74
uint8_t filter_level
Definition: vp8.h:80