/*
  * VP9 compatible video decoder
  *
  * Copyright (C) 2013 Ronald S. Bultje <rsbultje gmail com>
  * Copyright (C) 2013 Clément Bœsch <u pkh me>
  *
  * 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_VP9DEC_H
 #define AVCODEC_VP9DEC_H
 
 #include <stddef.h>
 #include <stdint.h>

 #include <stdatomic.h>

 
 #include "libavutil/buffer.h"

 #include "libavutil/thread.h"

 #include "libavutil/internal.h"
 
 #include "vp9.h"
 #include "vp9dsp.h"

 #include "vp9shared.h"

 
 enum MVJoint {
     MV_JOINT_ZERO,
     MV_JOINT_H,
     MV_JOINT_V,
     MV_JOINT_HV,
 };
 
 typedef struct ProbContext {
     uint8_t y_mode[4][9];
     uint8_t uv_mode[10][9];
     uint8_t filter[4][2];
     uint8_t mv_mode[7][3];
     uint8_t intra[4];
     uint8_t comp[5];
     uint8_t single_ref[5][2];
     uint8_t comp_ref[5];
     uint8_t tx32p[2][3];
     uint8_t tx16p[2][2];
     uint8_t tx8p[2];
     uint8_t skip[3];
     uint8_t mv_joint[3];
     struct {
         uint8_t sign;
         uint8_t classes[10];
         uint8_t class0;
         uint8_t bits[10];
         uint8_t class0_fp[2][3];
         uint8_t fp[3];
         uint8_t class0_hp;
         uint8_t hp;
     } mv_comp[2];
     uint8_t partition[4][4][3];
 } ProbContext;
 
 typedef struct VP9Filter {
     uint8_t level[8 * 8];
     uint8_t /* bit=col */ mask[2 /* 0=y, 1=uv */][2 /* 0=col, 1=row */]
                               [8 /* rows */][4 /* 0=16, 1=8, 2=4, 3=inner4 */];
 } VP9Filter;
 
 typedef struct VP9Block {
     uint8_t seg_id, intra, comp, ref[2], mode[4], uvmode, skip;
     enum FilterMode filter;
     VP56mv mv[4 /* b_idx */][2 /* ref */];
     enum BlockSize bs;
     enum TxfmMode tx, uvtx;
     enum BlockLevel bl;
     enum BlockPartition bp;
 } VP9Block;
 

 typedef struct VP9TileData VP9TileData;
 

 typedef struct VP9Context {
     VP9SharedContext s;

     VP9TileData *td;

 
     VP9DSPContext dsp;
     VideoDSPContext vdsp;
     GetBitContext gb;
     VP56RangeCoder c;

     int pass, active_tile_cols;
 

 #if HAVE_THREADS

     pthread_mutex_t progress_mutex;
     pthread_cond_t progress_cond;
     atomic_int *entries;

 #endif

 
     uint8_t ss_h, ss_v;
     uint8_t last_bpp, bpp_index, bytesperpixel;
     uint8_t last_keyframe;
     // sb_cols/rows, rows/cols and last_fmt are used for allocating all internal
     // arrays, and are thus per-thread. w/h and gf_fmt are synced between threads
     // and are therefore per-stream. pix_fmt represents the value in the header
     // of the currently processed frame.
     int w, h;
     enum AVPixelFormat pix_fmt, last_fmt, gf_fmt;
     unsigned sb_cols, sb_rows, rows, cols;
     ThreadFrame next_refs[8];
 
     struct {
         uint8_t lim_lut[64];
         uint8_t mblim_lut[64];
     } filter_lut;
     struct {
         ProbContext p;
         uint8_t coef[4][2][2][6][6][3];
     } prob_ctx[4];
     struct {
         ProbContext p;
         uint8_t coef[4][2][2][6][6][11];
     } prob;

 
     // contextual (above) cache
     uint8_t *above_partition_ctx;
     uint8_t *above_mode_ctx;
     // FIXME maybe merge some of the below in a flags field?
     uint8_t *above_y_nnz_ctx;
     uint8_t *above_uv_nnz_ctx[2];
     uint8_t *above_skip_ctx; // 1bit
     uint8_t *above_txfm_ctx; // 2bit
     uint8_t *above_segpred_ctx; // 1bit
     uint8_t *above_intra_ctx; // 1bit
     uint8_t *above_comp_ctx; // 1bit
     uint8_t *above_ref_ctx; // 2bit
     uint8_t *above_filter_ctx;
     VP56mv (*above_mv_ctx)[2];
 
     // whole-frame cache
     uint8_t *intra_pred_data[3];
     VP9Filter *lflvl;
 
     // block reconstruction intermediates
     int block_alloc_using_2pass;
     uint16_t mvscale[3][2];
     uint8_t mvstep[3][2];
 } VP9Context;
 
 struct VP9TileData {
     //VP9Context should be const, but because of the threading API(generates
     //a lot of warnings) it's not.
     VP9Context *s;
     VP56RangeCoder *c_b;
     VP56RangeCoder *c;
     int row, row7, col, col7;
     uint8_t *dst[3];
     ptrdiff_t y_stride, uv_stride;
     VP9Block *b_base, *b;
     unsigned tile_col_start;
 

     struct {
         unsigned y_mode[4][10];
         unsigned uv_mode[10][10];
         unsigned filter[4][3];
         unsigned mv_mode[7][4];
         unsigned intra[4][2];
         unsigned comp[5][2];
         unsigned single_ref[5][2][2];
         unsigned comp_ref[5][2];
         unsigned tx32p[2][4];
         unsigned tx16p[2][3];
         unsigned tx8p[2][2];
         unsigned skip[3][2];
         unsigned mv_joint[4];
         struct {
             unsigned sign[2];
             unsigned classes[11];
             unsigned class0[2];
             unsigned bits[10][2];
             unsigned class0_fp[2][4];
             unsigned fp[4];
             unsigned class0_hp[2];
             unsigned hp[2];
         } mv_comp[2];
         unsigned partition[4][4][4];
         unsigned coef[4][2][2][6][6][3];
         unsigned eob[4][2][2][6][6][2];
     } counts;
 

     // whole-frame cache
     DECLARE_ALIGNED(32, uint8_t, edge_emu_buffer)[135 * 144 * 2];
 
     // contextual (left) cache

     DECLARE_ALIGNED(16, uint8_t, left_y_nnz_ctx)[16];
     DECLARE_ALIGNED(16, uint8_t, left_mode_ctx)[16];
     DECLARE_ALIGNED(16, VP56mv, left_mv_ctx)[16][2];
     DECLARE_ALIGNED(16, uint8_t, left_uv_nnz_ctx)[2][16];
     DECLARE_ALIGNED(8, uint8_t, left_partition_ctx)[8];
     DECLARE_ALIGNED(8, uint8_t, left_skip_ctx)[8];
     DECLARE_ALIGNED(8, uint8_t, left_txfm_ctx)[8];
     DECLARE_ALIGNED(8, uint8_t, left_segpred_ctx)[8];
     DECLARE_ALIGNED(8, uint8_t, left_intra_ctx)[8];
     DECLARE_ALIGNED(8, uint8_t, left_comp_ctx)[8];
     DECLARE_ALIGNED(8, uint8_t, left_ref_ctx)[8];
     DECLARE_ALIGNED(8, uint8_t, left_filter_ctx)[8];
     // block reconstruction intermediates
     DECLARE_ALIGNED(32, uint8_t, tmp_y)[64 * 64 * 2];
     DECLARE_ALIGNED(32, uint8_t, tmp_uv)[2][64 * 64 * 2];

     struct { int x, y; } min_mv, max_mv;
     int16_t *block_base, *block, *uvblock_base[2], *uvblock[2];
     uint8_t *eob_base, *uveob_base[2], *eob, *uveob[2];
 };

 void ff_vp9_fill_mv(VP9TileData *td, VP56mv *mv, int mode, int sb);

 
 void ff_vp9_adapt_probs(VP9Context *s);
 

 void ff_vp9_decode_block(VP9TileData *td, int row, int col,

                          VP9Filter *lflvl, ptrdiff_t yoff, ptrdiff_t uvoff,
                          enum BlockLevel bl, enum BlockPartition bp);
 

 void ff_vp9_loopfilter_sb(AVCodecContext *avctx, VP9Filter *lflvl,
                           int row, int col, ptrdiff_t yoff, ptrdiff_t uvoff);
 

 void ff_vp9_intra_recon_8bpp(VP9TileData *td,

                              ptrdiff_t y_off, ptrdiff_t uv_off);

 void ff_vp9_intra_recon_16bpp(VP9TileData *td,

                               ptrdiff_t y_off, ptrdiff_t uv_off);

 void ff_vp9_inter_recon_8bpp(VP9TileData *td);
 void ff_vp9_inter_recon_16bpp(VP9TileData *td);

 #endif /* AVCODEC_VP9DEC_H */