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+/*
+ * 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;
+
+ AVBufferRef *hwaccel_priv_buf;
+ void *hwaccel_picture_private;
+} VP8Frame;
+
+#define MAX_THREADS 8
+typedef struct VP8Context {
+ VP8ThreadData *thread_data;
+ AVCodecContext *avctx;
+ enum AVPixelFormat pix_fmt;
+ int actually_webp;
+
+ 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;
+ uint8_t update_feature_data;
+ 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];
+
+ // Raw quantisation values, which may be needed by hwaccel decode.
+ struct {
+ int yac_qi;
+ int ydc_delta;
+ int y2dc_delta;
+ int y2ac_delta;
+ int uvdc_delta;
+ int uvac_delta;
+ } quant;
+
+ struct {
+ uint8_t enabled; ///< whether each mb can have a different strength based on mode/ref
+ uint8_t update;
+
+ /**
+ * 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
+
+ /* This contains the entropy coder state at the end of the header
+ * block, in the form specified by the standard. For use by
+ * hwaccels, so that a hardware decoder has the information to
+ * start decoding at the macroblock layer.
+ */
+ struct {
+ const uint8_t *input;
+ uint32_t range;
+ uint32_t value;
+ int bit_count;
+ } coder_state_at_header_end;
+
+ int header_partition_size;
+
+ /**
+ * 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];
+ int coeff_partition_size[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 */
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