VP8: split out declarations to new header

1 files changed, 242 insertions, 0 deletions

diff --git a/libavcodec/vp8.h b/libavcodec/vp8.h
new file mode 100644
index 0000000000..d3b8705ea0
--- /dev/null
+++ b/libavcodec/vp8.h
@@ -0,0 +1,242 @@
+/**
+ * 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 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 "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;
+    DSPContext dsp;
+    VP8DSPContext vp8dsp;
+    H264PredContext hpc;
+    vp8_mc_func put_pixels_tab[3][3][3];
+    AVFrame frames[4];
+    AVFrame *framep[4];
+    uint8_t *edge_emu_buffer;
+    VP56RangeCoder c;   ///< header context, includes mb modes and motion vectors
+    int profile;
+
+    int mb_width;   /* number of horizontal MB */
+    int mb_height;  /* number of vertical MB */
+    int linesize;
+    int uvlinesize;
+
+    int keyframe;
+    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;
+    int deblock_filter;
+
+    /**
+     * 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];
+
+    VP8Macroblock *macroblocks;
+    VP8Macroblock *macroblocks_base;
+    VP8FilterStrength *filter_strength;
+
+    uint8_t *intra4x4_pred_mode_top;
+    uint8_t intra4x4_pred_mode_left[4];
+    uint8_t *segmentation_map;
+
+    /**
+     * 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];
+    DECLARE_ALIGNED(16, DCTELEM, block)[6][4][16];
+    DECLARE_ALIGNED(16, DCTELEM, block_dc)[16];
+    uint8_t intra4x4_pred_mode_mb[16];
+
+    int chroma_pred_mode;    ///< 8x8c pred mode of the current macroblock
+    int segment;             ///< segment of the current macroblock
+    VP56mv mv_min;
+    VP56mv mv_max;
+
+    int mbskip_enabled;
+    int 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 {
+        int enabled;
+        int absolute_vals;
+        int update_map;
+        int8_t base_quant[4];
+        int8_t filter_level[4];     ///< base loop filter level
+    } segmentation;
+
+    /**
+     * 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 {
+        int simple;
+        int level;
+        int sharpness;
+    } filter;
+
+    struct {
+        int 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;
+
+    /**
+     * 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];
+        /* Padded to allow overreads */
+        uint8_t token[4][17][3][NUM_DCT_TOKENS-1];
+        uint8_t mvc[2][19];
+    } prob[2];
+} VP8Context;
+
+#endif