2 * VP8 compatible video decoder
4 * Copyright (C) 2010 David Conrad
5 * Copyright (C) 2010 Ronald S. Bultje
6 * Copyright (C) 2010 Fiona Glaser
7 * Copyright (C) 2012 Daniel Kang
9 * This file is part of FFmpeg.
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.
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.
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
29 #include "libavutil/buffer.h"
39 # include "compat/os2threads.h"
41 # include "compat/w32pthreads.h"
44 #define VP8_MAX_QUANT 127
63 // used to signal 4x4 intra pred in luma MBs
67 VP8_MVMODE_ZERO
= MODE_I4x4
+ 1,
72 enum inter_splitmvmode
{
73 VP8_SPLITMVMODE_16x8
= 0, ///< 2 16x8 blocks (vertical)
74 VP8_SPLITMVMODE_8x16
, ///< 2 8x16 blocks (horizontal)
75 VP8_SPLITMVMODE_8x8
, ///< 2x2 blocks of 8x8px each
76 VP8_SPLITMVMODE_4x4
, ///< 4x4 blocks of 4x4px each
77 VP8_SPLITMVMODE_NONE
, ///< (only used in prediction) no split MVs
80 typedef struct VP8FilterStrength
{
86 typedef struct VP8Macroblock
{
88 // TODO: make it possible to check for at least (i4x4 or split_mv)
89 // in one op. are others needed?
93 uint8_t chroma_pred_mode
;
95 uint8_t intra4x4_pred_mode_mb
[16];
96 DECLARE_ALIGNED(4, uint8_t, intra4x4_pred_mode_top
)[4];
101 typedef struct VP8ThreadData
{
102 DECLARE_ALIGNED(16, int16_t, block
)[6][4][16];
103 DECLARE_ALIGNED(16, int16_t, block_dc
)[16];
105 * This is the index plus one of the last non-zero coeff
106 * for each of the blocks in the current macroblock.
108 * 1 -> dc-only (special transform)
109 * 2+-> full transform
111 DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache
)[6][4];
113 * For coeff decode, we need to know whether the above block had non-zero
114 * coefficients. This means for each macroblock, we need data for 4 luma
115 * blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9
116 * per macroblock. We keep the last row in top_nnz.
118 DECLARE_ALIGNED(8, uint8_t, left_nnz
)[9];
121 pthread_mutex_t lock
;
124 int thread_mb_pos
; // (mb_y << 16) | (mb_x & 0xFFFF)
125 int wait_mb_pos
; // What the current thread is waiting on.
127 #define EDGE_EMU_LINESIZE 32
128 DECLARE_ALIGNED(16, uint8_t, edge_emu_buffer
)[21 * EDGE_EMU_LINESIZE
];
129 VP8FilterStrength
*filter_strength
;
132 typedef struct VP8Frame
{
134 AVBufferRef
*seg_map
;
137 #define MAX_THREADS 8
138 typedef struct VP8Context
{
139 VP8ThreadData
*thread_data
;
140 AVCodecContext
*avctx
;
142 VP8Frame
*next_framep
[4];
144 VP8Frame
*prev_frame
;
146 uint16_t mb_width
; /* number of horizontal MB */
147 uint16_t mb_height
; /* number of vertical MB */
152 uint8_t deblock_filter
;
153 uint8_t mbskip_enabled
;
158 int8_t sign_bias
[4]; ///< one state [0, 1] per ref frame type
162 * Base parameters for segmentation, i.e. per-macroblock parameters.
163 * These must be kept unchanged even if segmentation is not used for
164 * a frame, since the values persist between interframes.
168 uint8_t absolute_vals
;
170 int8_t base_quant
[4];
171 int8_t filter_level
[4]; ///< base loop filter level
180 VP8Macroblock
*macroblocks
;
182 uint8_t *intra4x4_pred_mode_top
;
183 uint8_t intra4x4_pred_mode_left
[4];
186 * Macroblocks can have one of 4 different quants in a frame when
187 * segmentation is enabled.
188 * If segmentation is disabled, only the first segment's values are used.
191 // [0] - DC qmul [1] - AC qmul
192 int16_t luma_qmul
[2];
193 int16_t luma_dc_qmul
[2]; ///< luma dc-only block quant
194 int16_t chroma_qmul
[2];
198 uint8_t enabled
; ///< whether each mb can have a different strength based on mode/ref
201 * filter strength adjustment for the following macroblock modes:
202 * [0-3] - i16x16 (always zero)
205 * [6] - inter modes except for zero or split mv
207 * i16x16 modes never have any adjustment
209 int8_t mode
[VP8_MVMODE_SPLIT
+ 1];
212 * filter strength adjustment for macroblocks that reference:
213 * [0] - intra / VP56_FRAME_CURRENT
214 * [1] - VP56_FRAME_PREVIOUS
215 * [2] - VP56_FRAME_GOLDEN
216 * [3] - altref / VP56_FRAME_GOLDEN2
221 uint8_t (*top_border
)[16 + 8 + 8];
222 uint8_t (*top_nnz
)[9];
224 VP56RangeCoder c
; ///< header context, includes mb modes and motion vectors
227 * These are all of the updatable probabilities for binary decisions.
228 * They are only implictly reset on keyframes, making it quite likely
229 * for an interframe to desync if a prior frame's header was corrupt
230 * or missing outright!
233 uint8_t segmentid
[3];
238 uint8_t pred16x16
[4];
240 uint8_t token
[4][16][3][NUM_DCT_TOKENS
- 1];
245 VP8Macroblock
*macroblocks_base
;
247 int update_last
; ///< update VP56_FRAME_PREVIOUS with the current one
248 int update_golden
; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so
252 * If this flag is not set, all the probability updates
253 * are discarded after this frame is decoded.
255 int update_probabilities
;
258 * All coefficients are contained in separate arith coding contexts.
259 * There can be 1, 2, 4, or 8 of these after the header context.
261 int num_coeff_partitions
;
262 VP56RangeCoder coeff_partition
[8];
263 VideoDSPContext vdsp
;
264 VP8DSPContext vp8dsp
;
266 vp8_mc_func put_pixels_tab
[3][3][3];
269 uint8_t colorspace
; ///< 0 is the only value allowed (meaning bt601)
270 uint8_t fullrange
; ///< whether we can skip clamping in dsp functions
274 * This describes the macroblock memory layout.
275 * 0 -> Only width+height*2+1 macroblocks allocated (frame/single thread).
276 * 1 -> Macroblocks for entire frame alloced (sliced thread).
280 void (*decode_mb_row_no_filter
)(AVCodecContext
*avctx
, void *tdata
, int jobnr
, int threadnr
);
281 void (*filter_mb_row
)(AVCodecContext
*avctx
, void *tdata
, int jobnr
, int threadnr
);
286 * Fade bit present in bitstream (VP7)
291 * Interframe DC prediction (VP7)
292 * [0] VP56_FRAME_PREVIOUS
293 * [1] VP56_FRAME_GOLDEN
295 uint16_t inter_dc_pred
[2][2];
298 * Macroblock features (VP7)
300 uint8_t feature_enabled
[4];
301 uint8_t feature_present_prob
[4];
302 uint8_t feature_index_prob
[4][3];
303 uint8_t feature_value
[4][4];
306 int ff_vp8_decode_init(AVCodecContext
*avctx
);
308 int ff_vp8_decode_frame(AVCodecContext
*avctx
, void *data
, int *got_frame
,
311 int ff_vp8_decode_free(AVCodecContext
*avctx
);
313 #endif /* AVCODEC_VP8_H */