/*
* VP8 compatible video decoder
*
* Copyright (C) 2010 David Conrad
* Copyright (C) 2010 Ronald S. Bultje
* Copyright (C) 2010 Fiona Glaser
* Copyright (C) 2012 Daniel Kang
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; 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 <stdatomic.h>
#include "libavutil/buffer.h"
#include "libavutil/thread.h"
#include "h264pred.h"
#include "thread.h"
#include "vp56.h"
#include "vp8dsp.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 VP8FilterStrength {
uint8_t filter_level;
uint8_t inner_limit;
uint8_t inner_filter;
} VP8FilterStrength;
typedef struct VP8Macroblock {
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;
uint8_t chroma_pred_mode;
uint8_t segment;
uint8_t intra4x4_pred_mode_mb[16];
DECLARE_ALIGNED(4, uint8_t, intra4x4_pred_mode_top)[4];
VP56mv mv;
VP56mv bmv[16];
} VP8Macroblock;
typedef struct VP8intmv {
int x;
int y;
} VP8intmv;
typedef struct VP8mvbounds {
VP8intmv mv_min;
VP8intmv mv_max;
} VP8mvbounds;
typedef struct VP8ThreadData {
DECLARE_ALIGNED(16, int16_t, block)[6][4][16];
DECLARE_ALIGNED(16, int16_t, block_dc)[16];
/**
* 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];
/**
* 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.
*/
DECLARE_ALIGNED(8, uint8_t, left_nnz)[9];
int thread_nr;
#if HAVE_THREADS
pthread_mutex_t lock;
pthread_cond_t cond;
#endif
atomic_int thread_mb_pos; // (mb_y << 16) | (mb_x & 0xFFFF)
atomic_int wait_mb_pos; // What the current thread is waiting on.
#define EDGE_EMU_LINESIZE 32
DECLARE_ALIGNED(16, uint8_t, edge_emu_buffer)[21 * EDGE_EMU_LINESIZE];
VP8FilterStrength *filter_strength;
VP8mvbounds mv_bounds;
} VP8ThreadData;
typedef struct VP8Frame {
ThreadFrame tf;
AVBufferRef *seg_map;
} VP8Frame;
#define MAX_THREADS 8
typedef struct VP8Context {
VP8ThreadData *thread_data;
AVCodecContext *avctx;
VP8Frame *framep[4];
VP8Frame *next_framep[4];
VP8Frame *curframe;
VP8Frame *prev_frame;
uint16_t mb_width; /* number of horizontal MB */
uint16_t mb_height; /* number of vertical MB */
ptrdiff_t linesize;
ptrdiff_t uvlinesize;
uint8_t keyframe;
uint8_t deblock_filter;
uint8_t mbskip_enabled;
uint8_t profile;
VP8mvbounds mv_bounds;
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;
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;
uint8_t (*top_border)[16 + 8 + 8];
uint8_t (*top_nnz)[9];
VP56RangeCoder c; ///< header context, includes mb modes and motion vectors
/**
* These are all of the updatable probabilities for binary decisions.
* They are only implicitly 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];
uint8_t scan[16];
} 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];
VideoDSPContext vdsp;
VP8DSPContext vp8dsp;
H264PredContext hpc;
vp8_mc_func put_pixels_tab[3][3][3];
VP8Frame frames[5];
uint8_t colorspace; ///< 0 is the only value allowed (meaning bt601)
uint8_t fullrange; ///< whether we can skip clamping in dsp functions
int num_jobs;
/**
* This describes the macroblock memory layout.
* 0 -> Only width+height*2+1 macroblocks allocated (frame/single thread).
* 1 -> Macroblocks for entire frame allocated (sliced thread).
*/
int mb_layout;
int (*decode_mb_row_no_filter)(AVCodecContext *avctx, void *tdata, int jobnr, int threadnr);
void (*filter_mb_row)(AVCodecContext *avctx, void *tdata, int jobnr, int threadnr);
int vp7;
/**
* Fade bit present in bitstream (VP7)
*/
int fade_present;
/**
* Interframe DC prediction (VP7)
* [0] VP56_FRAME_PREVIOUS
* [1] VP56_FRAME_GOLDEN
*/
uint16_t inter_dc_pred[2][2];
/**
* Macroblock features (VP7)
*/
uint8_t feature_enabled[4];
uint8_t feature_present_prob[4];
uint8_t feature_index_prob[4][3];
uint8_t feature_value[4][4];
} VP8Context;
int ff_vp8_decode_init(AVCodecContext *avctx);
int ff_vp8_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
AVPacket *avpkt);
int ff_vp8_decode_free(AVCodecContext *avctx);
#endif /* AVCODEC_VP8_H */