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 <stdatomic.h>
31 #include "libavutil/buffer.h"
32 #include "libavutil/mem_internal.h"
33 #include "libavutil/thread.h"
40 #define VP8_MAX_QUANT 127
59 // used to signal 4x4 intra pred in luma MBs
63 VP8_MVMODE_ZERO = MODE_I4x4 + 1,
68 enum inter_splitmvmode {
69 VP8_SPLITMVMODE_16x8 = 0, ///< 2 16x8 blocks (vertical)
70 VP8_SPLITMVMODE_8x16, ///< 2 8x16 blocks (horizontal)
71 VP8_SPLITMVMODE_8x8, ///< 2x2 blocks of 8x8px each
72 VP8_SPLITMVMODE_4x4, ///< 4x4 blocks of 4x4px each
73 VP8_SPLITMVMODE_NONE, ///< (only used in prediction) no split MVs
76 typedef struct VP8FilterStrength {
82 typedef struct VP8Macroblock {
84 // TODO: make it possible to check for at least (i4x4 or split_mv)
85 // in one op. are others needed?
89 uint8_t chroma_pred_mode;
91 uint8_t intra4x4_pred_mode_mb[16];
92 DECLARE_ALIGNED(4, uint8_t, intra4x4_pred_mode_top)[4];
97 typedef struct VP8intmv {
102 typedef struct VP8mvbounds {
107 typedef struct VP8ThreadData {
108 DECLARE_ALIGNED(16, int16_t, block)[6][4][16];
109 DECLARE_ALIGNED(16, int16_t, block_dc)[16];
111 * This is the index plus one of the last non-zero coeff
112 * for each of the blocks in the current macroblock.
114 * 1 -> dc-only (special transform)
115 * 2+-> full transform
117 DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4];
119 * For coeff decode, we need to know whether the above block had non-zero
120 * coefficients. This means for each macroblock, we need data for 4 luma
121 * blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9
122 * per macroblock. We keep the last row in top_nnz.
124 DECLARE_ALIGNED(8, uint8_t, left_nnz)[9];
127 pthread_mutex_t lock;
130 atomic_int thread_mb_pos; // (mb_y << 16) | (mb_x & 0xFFFF)
131 atomic_int wait_mb_pos; // What the current thread is waiting on.
133 #define EDGE_EMU_LINESIZE 32
134 DECLARE_ALIGNED(16, uint8_t, edge_emu_buffer)[21 * EDGE_EMU_LINESIZE];
135 VP8FilterStrength *filter_strength;
136 VP8mvbounds mv_bounds;
139 typedef struct VP8Frame {
141 AVBufferRef *seg_map;
143 AVBufferRef *hwaccel_priv_buf;
144 void *hwaccel_picture_private;
147 #define MAX_THREADS 8
148 typedef struct VP8Context {
149 VP8ThreadData *thread_data;
150 AVCodecContext *avctx;
151 enum AVPixelFormat pix_fmt;
155 VP8Frame *next_framep[4];
157 VP8Frame *prev_frame;
159 uint16_t mb_width; /* number of horizontal MB */
160 uint16_t mb_height; /* number of vertical MB */
162 ptrdiff_t uvlinesize;
165 uint8_t deblock_filter;
166 uint8_t mbskip_enabled;
168 VP8mvbounds mv_bounds;
170 int8_t sign_bias[4]; ///< one state [0, 1] per ref frame type
174 * Base parameters for segmentation, i.e. per-macroblock parameters.
175 * These must be kept unchanged even if segmentation is not used for
176 * a frame, since the values persist between interframes.
180 uint8_t absolute_vals;
182 uint8_t update_feature_data;
183 int8_t base_quant[4];
184 int8_t filter_level[4]; ///< base loop filter level
193 VP8Macroblock *macroblocks;
195 uint8_t *intra4x4_pred_mode_top;
196 uint8_t intra4x4_pred_mode_left[4];
199 * Macroblocks can have one of 4 different quants in a frame when
200 * segmentation is enabled.
201 * If segmentation is disabled, only the first segment's values are used.
204 // [0] - DC qmul [1] - AC qmul
205 int16_t luma_qmul[2];
206 int16_t luma_dc_qmul[2]; ///< luma dc-only block quant
207 int16_t chroma_qmul[2];
210 // Raw quantisation values, which may be needed by hwaccel decode.
221 uint8_t enabled; ///< whether each mb can have a different strength based on mode/ref
225 * filter strength adjustment for the following macroblock modes:
226 * [0-3] - i16x16 (always zero)
229 * [6] - inter modes except for zero or split mv
231 * i16x16 modes never have any adjustment
233 int8_t mode[VP8_MVMODE_SPLIT + 1];
236 * filter strength adjustment for macroblocks that reference:
237 * [0] - intra / VP56_FRAME_CURRENT
238 * [1] - VP56_FRAME_PREVIOUS
239 * [2] - VP56_FRAME_GOLDEN
240 * [3] - altref / VP56_FRAME_GOLDEN2
245 uint8_t (*top_border)[16 + 8 + 8];
246 uint8_t (*top_nnz)[9];
248 VP56RangeCoder c; ///< header context, includes mb modes and motion vectors
250 /* This contains the entropy coder state at the end of the header
251 * block, in the form specified by the standard. For use by
252 * hwaccels, so that a hardware decoder has the information to
253 * start decoding at the macroblock layer.
256 const uint8_t *input;
260 } coder_state_at_header_end;
262 int header_partition_size;
265 * These are all of the updatable probabilities for binary decisions.
266 * They are only implicitly reset on keyframes, making it quite likely
267 * for an interframe to desync if a prior frame's header was corrupt
268 * or missing outright!
271 uint8_t segmentid[3];
276 uint8_t pred16x16[4];
278 uint8_t token[4][16][3][NUM_DCT_TOKENS - 1];
283 VP8Macroblock *macroblocks_base;
285 int update_last; ///< update VP56_FRAME_PREVIOUS with the current one
286 int update_golden; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so
290 * If this flag is not set, all the probability updates
291 * are discarded after this frame is decoded.
293 int update_probabilities;
296 * All coefficients are contained in separate arith coding contexts.
297 * There can be 1, 2, 4, or 8 of these after the header context.
299 int num_coeff_partitions;
300 VP56RangeCoder coeff_partition[8];
301 int coeff_partition_size[8];
302 VideoDSPContext vdsp;
303 VP8DSPContext vp8dsp;
305 vp8_mc_func put_pixels_tab[3][3][3];
308 uint8_t colorspace; ///< 0 is the only value allowed (meaning bt601)
309 uint8_t fullrange; ///< whether we can skip clamping in dsp functions
313 * This describes the macroblock memory layout.
314 * 0 -> Only width+height*2+1 macroblocks allocated (frame/single thread).
315 * 1 -> Macroblocks for entire frame allocated (sliced thread).
319 int (*decode_mb_row_no_filter)(AVCodecContext *avctx, void *tdata, int jobnr, int threadnr);
320 void (*filter_mb_row)(AVCodecContext *avctx, void *tdata, int jobnr, int threadnr);
325 * Fade bit present in bitstream (VP7)
330 * Interframe DC prediction (VP7)
331 * [0] VP56_FRAME_PREVIOUS
332 * [1] VP56_FRAME_GOLDEN
334 uint16_t inter_dc_pred[2][2];
337 * Macroblock features (VP7)
339 uint8_t feature_enabled[4];
340 uint8_t feature_present_prob[4];
341 uint8_t feature_index_prob[4][3];
342 uint8_t feature_value[4][4];
345 int ff_vp8_decode_init(AVCodecContext *avctx);
347 int ff_vp8_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
350 int ff_vp8_decode_free(AVCodecContext *avctx);
352 #endif /* AVCODEC_VP8_H */