FFmpeg/libavcodec/vp8.h
Ronald S. Bultje ce42a04884 vp8: fix up handling of segmentation_maps in reference frames.
Associate segmentation_map[] with reference frame, rather than
decoding instance. This fixes cases where the map would be free()'ed
on e.g. a size change in one thread, whereas the other thread was
still accessing it. Also, it fixes cases where threads overwrite data
that is still being referenced by the previous thread, who thinks that
it's part of the frame previously decoded by the next thread.
2011-10-21 00:17:58 -07:00

252 lines
7.3 KiB
C

/**
* VP8 compatible video decoder
*
* Copyright (C) 2010 David Conrad
* Copyright (C) 2010 Ronald S. Bultje
* Copyright (C) 2010 Jason Garrett-Glaser
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_VP8_H
#define AVCODEC_VP8_H
#include "vp56.h"
#include "vp56data.h"
#include "vp8dsp.h"
#include "h264pred.h"
#define VP8_MAX_QUANT 127
enum dct_token {
DCT_0,
DCT_1,
DCT_2,
DCT_3,
DCT_4,
DCT_CAT1,
DCT_CAT2,
DCT_CAT3,
DCT_CAT4,
DCT_CAT5,
DCT_CAT6,
DCT_EOB,
NUM_DCT_TOKENS
};
// used to signal 4x4 intra pred in luma MBs
#define MODE_I4x4 4
enum inter_mvmode {
VP8_MVMODE_ZERO = MODE_I4x4 + 1,
VP8_MVMODE_MV,
VP8_MVMODE_SPLIT
};
enum inter_splitmvmode {
VP8_SPLITMVMODE_16x8 = 0, ///< 2 16x8 blocks (vertical)
VP8_SPLITMVMODE_8x16, ///< 2 8x16 blocks (horizontal)
VP8_SPLITMVMODE_8x8, ///< 2x2 blocks of 8x8px each
VP8_SPLITMVMODE_4x4, ///< 4x4 blocks of 4x4px each
VP8_SPLITMVMODE_NONE, ///< (only used in prediction) no split MVs
};
typedef struct {
uint8_t filter_level;
uint8_t inner_limit;
uint8_t inner_filter;
} VP8FilterStrength;
typedef struct {
uint8_t skip;
// todo: make it possible to check for at least (i4x4 or split_mv)
// in one op. are others needed?
uint8_t mode;
uint8_t ref_frame;
uint8_t partitioning;
VP56mv mv;
VP56mv bmv[16];
} VP8Macroblock;
typedef struct {
AVCodecContext *avctx;
AVFrame *framep[4];
AVFrame *next_framep[4];
uint8_t *edge_emu_buffer;
uint16_t mb_width; /* number of horizontal MB */
uint16_t mb_height; /* number of vertical MB */
int linesize;
int uvlinesize;
uint8_t keyframe;
uint8_t deblock_filter;
uint8_t mbskip_enabled;
uint8_t segment; ///< segment of the current macroblock
uint8_t chroma_pred_mode; ///< 8x8c pred mode of the current macroblock
uint8_t profile;
VP56mv mv_min;
VP56mv mv_max;
int8_t sign_bias[4]; ///< one state [0, 1] per ref frame type
int ref_count[3];
/**
* Base parameters for segmentation, i.e. per-macroblock parameters.
* These must be kept unchanged even if segmentation is not used for
* a frame, since the values persist between interframes.
*/
struct {
uint8_t enabled;
uint8_t absolute_vals;
uint8_t update_map;
int8_t base_quant[4];
int8_t filter_level[4]; ///< base loop filter level
} segmentation;
struct {
uint8_t simple;
uint8_t level;
uint8_t sharpness;
} filter;
VP8Macroblock *macroblocks;
VP8FilterStrength *filter_strength;
uint8_t *intra4x4_pred_mode_top;
uint8_t intra4x4_pred_mode_left[4];
/**
* Macroblocks can have one of 4 different quants in a frame when
* segmentation is enabled.
* If segmentation is disabled, only the first segment's values are used.
*/
struct {
// [0] - DC qmul [1] - AC qmul
int16_t luma_qmul[2];
int16_t luma_dc_qmul[2]; ///< luma dc-only block quant
int16_t chroma_qmul[2];
} qmat[4];
struct {
uint8_t enabled; ///< whether each mb can have a different strength based on mode/ref
/**
* filter strength adjustment for the following macroblock modes:
* [0-3] - i16x16 (always zero)
* [4] - i4x4
* [5] - zero mv
* [6] - inter modes except for zero or split mv
* [7] - split mv
* i16x16 modes never have any adjustment
*/
int8_t mode[VP8_MVMODE_SPLIT+1];
/**
* filter strength adjustment for macroblocks that reference:
* [0] - intra / VP56_FRAME_CURRENT
* [1] - VP56_FRAME_PREVIOUS
* [2] - VP56_FRAME_GOLDEN
* [3] - altref / VP56_FRAME_GOLDEN2
*/
int8_t ref[4];
} lf_delta;
/**
* Cache of the top row needed for intra prediction
* 16 for luma, 8 for each chroma plane
*/
uint8_t (*top_border)[16+8+8];
/**
* For coeff decode, we need to know whether the above block had non-zero
* coefficients. This means for each macroblock, we need data for 4 luma
* blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9
* per macroblock. We keep the last row in top_nnz.
*/
uint8_t (*top_nnz)[9];
DECLARE_ALIGNED(8, uint8_t, left_nnz)[9];
/**
* This is the index plus one of the last non-zero coeff
* for each of the blocks in the current macroblock.
* So, 0 -> no coeffs
* 1 -> dc-only (special transform)
* 2+-> full transform
*/
DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4];
VP56RangeCoder c; ///< header context, includes mb modes and motion vectors
DECLARE_ALIGNED(16, DCTELEM, block)[6][4][16];
DECLARE_ALIGNED(16, DCTELEM, block_dc)[16];
uint8_t intra4x4_pred_mode_mb[16];
/**
* These are all of the updatable probabilities for binary decisions.
* They are only implictly reset on keyframes, making it quite likely
* for an interframe to desync if a prior frame's header was corrupt
* or missing outright!
*/
struct {
uint8_t segmentid[3];
uint8_t mbskip;
uint8_t intra;
uint8_t last;
uint8_t golden;
uint8_t pred16x16[4];
uint8_t pred8x8c[3];
uint8_t token[4][16][3][NUM_DCT_TOKENS-1];
uint8_t mvc[2][19];
} prob[2];
VP8Macroblock *macroblocks_base;
int invisible;
int update_last; ///< update VP56_FRAME_PREVIOUS with the current one
int update_golden; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so
int update_altref;
/**
* If this flag is not set, all the probability updates
* are discarded after this frame is decoded.
*/
int update_probabilities;
/**
* All coefficients are contained in separate arith coding contexts.
* There can be 1, 2, 4, or 8 of these after the header context.
*/
int num_coeff_partitions;
VP56RangeCoder coeff_partition[8];
DSPContext dsp;
VP8DSPContext vp8dsp;
H264PredContext hpc;
vp8_mc_func put_pixels_tab[3][3][3];
AVFrame frames[5];
/**
* A list of segmentation_map buffers that are to be free()'ed in
* the next decoding iteration. We can't free() them right away
* because the map may still be used by subsequent decoding threads.
* Unused if frame threading is off.
*/
uint8_t *segmentation_maps[5];
int num_maps_to_be_freed;
int maps_are_invalid;
} VP8Context;
#endif /* AVCODEC_VP8_H */