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+/*
+ * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * VP5 and VP6 compatible video decoder (common features)
+ */
+
+#ifndef AVCODEC_VP56_H
+#define AVCODEC_VP56_H
+
+#include "avcodec.h"
+#include "get_bits.h"
+#include "hpeldsp.h"
+#include "bytestream.h"
+#include "h264chroma.h"
+#include "videodsp.h"
+#include "vp3dsp.h"
+#include "vp56dsp.h"
+
+typedef struct vp56_context VP56Context;
+
+typedef enum {
+ VP56_FRAME_NONE =-1,
+ VP56_FRAME_CURRENT = 0,
+ VP56_FRAME_PREVIOUS = 1,
+ VP56_FRAME_GOLDEN = 2,
+ VP56_FRAME_GOLDEN2 = 3,
+} VP56Frame;
+
+typedef enum {
+ VP56_MB_INTER_NOVEC_PF = 0, /**< Inter MB, no vector, from previous frame */
+ VP56_MB_INTRA = 1, /**< Intra MB */
+ VP56_MB_INTER_DELTA_PF = 2, /**< Inter MB, above/left vector + delta, from previous frame */
+ VP56_MB_INTER_V1_PF = 3, /**< Inter MB, first vector, from previous frame */
+ VP56_MB_INTER_V2_PF = 4, /**< Inter MB, second vector, from previous frame */
+ VP56_MB_INTER_NOVEC_GF = 5, /**< Inter MB, no vector, from golden frame */
+ VP56_MB_INTER_DELTA_GF = 6, /**< Inter MB, above/left vector + delta, from golden frame */
+ VP56_MB_INTER_4V = 7, /**< Inter MB, 4 vectors, from previous frame */
+ VP56_MB_INTER_V1_GF = 8, /**< Inter MB, first vector, from golden frame */
+ VP56_MB_INTER_V2_GF = 9, /**< Inter MB, second vector, from golden frame */
+} VP56mb;
+
+typedef struct VP56Tree {
+ int8_t val;
+ int8_t prob_idx;
+} VP56Tree;
+
+typedef struct VP56mv {
+ DECLARE_ALIGNED(4, int16_t, x);
+ int16_t y;
+} VP56mv;
+
+#define VP56_SIZE_CHANGE 1
+
+typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
+ VP56mv *vect);
+typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
+ int offset1, int offset2, ptrdiff_t stride,
+ VP56mv mv, int mask, int select, int luma);
+typedef int (*VP56ParseCoeff)(VP56Context *s);
+typedef void (*VP56DefaultModelsInit)(VP56Context *s);
+typedef void (*VP56ParseVectorModels)(VP56Context *s);
+typedef int (*VP56ParseCoeffModels)(VP56Context *s);
+typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
+ int buf_size);
+
+typedef struct VP56RangeCoder {
+ int high;
+ int bits; /* stored negated (i.e. negative "bits" is a positive number of
+ bits left) in order to eliminate a negate in cache refilling */
+ const uint8_t *buffer;
+ const uint8_t *end;
+ unsigned int code_word;
+ int end_reached;
+} VP56RangeCoder;
+
+typedef struct VP56RefDc {
+ uint8_t not_null_dc;
+ VP56Frame ref_frame;
+ int16_t dc_coeff;
+} VP56RefDc;
+
+typedef struct VP56Macroblock {
+ uint8_t type;
+ VP56mv mv;
+} VP56Macroblock;
+
+typedef struct VP56Model {
+ uint8_t coeff_reorder[64]; /* used in vp6 only */
+ uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
+ uint8_t coeff_index_to_idct_selector[64]; /* used in vp6 only */
+ uint8_t vector_sig[2]; /* delta sign */
+ uint8_t vector_dct[2]; /* delta coding types */
+ uint8_t vector_pdi[2][2]; /* predefined delta init */
+ uint8_t vector_pdv[2][7]; /* predefined delta values */
+ uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */
+ uint8_t coeff_dccv[2][11]; /* DC coeff value */
+ uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
+ uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
+ uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */
+ uint8_t coeff_runv[2][14]; /* run value (vp6 only) */
+ uint8_t mb_type[3][10][10]; /* model for decoding MB type */
+ uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
+} VP56Model;
+
+struct vp56_context {
+ AVCodecContext *avctx;
+ H264ChromaContext h264chroma;
+ HpelDSPContext hdsp;
+ VideoDSPContext vdsp;
+ VP3DSPContext vp3dsp;
+ VP56DSPContext vp56dsp;
+ uint8_t idct_scantable[64];
+ AVFrame *frames[4];
+ uint8_t *edge_emu_buffer_alloc;
+ uint8_t *edge_emu_buffer;
+ VP56RangeCoder c;
+ VP56RangeCoder cc;
+ VP56RangeCoder *ccp;
+ int sub_version;
+
+ /* frame info */
+ int golden_frame;
+ int plane_width[4];
+ int plane_height[4];
+ int mb_width; /* number of horizontal MB */
+ int mb_height; /* number of vertical MB */
+ int block_offset[6];
+
+ int quantizer;
+ uint16_t dequant_dc;
+ uint16_t dequant_ac;
+
+ /* DC predictors management */
+ VP56RefDc *above_blocks;
+ VP56RefDc left_block[4];
+ int above_block_idx[6];
+ int16_t prev_dc[3][3]; /* [plan][ref_frame] */
+
+ /* blocks / macroblock */
+ VP56mb mb_type;
+ VP56Macroblock *macroblocks;
+ DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
+ int idct_selector[6];
+
+ /* motion vectors */
+ VP56mv mv[6]; /* vectors for each block in MB */
+ VP56mv vector_candidate[2];
+ int vector_candidate_pos;
+
+ /* filtering hints */
+ int filter_header; /* used in vp6 only */
+ int deblock_filtering;
+ int filter_selection;
+ int filter_mode;
+ int max_vector_length;
+ int sample_variance_threshold;
+ DECLARE_ALIGNED(8, int, bounding_values_array)[256];
+
+ uint8_t coeff_ctx[4][64]; /* used in vp5 only */
+ uint8_t coeff_ctx_last[4]; /* used in vp5 only */
+
+ int has_alpha;
+
+ /* upside-down flipping hints */
+ int flip; /* are we flipping ? */
+ int frbi; /* first row block index in MB */
+ int srbi; /* second row block index in MB */
+ ptrdiff_t stride[4]; /* stride for each plan */
+
+ const uint8_t *vp56_coord_div;
+ VP56ParseVectorAdjustment parse_vector_adjustment;
+ VP56Filter filter;
+ VP56ParseCoeff parse_coeff;
+ VP56DefaultModelsInit default_models_init;
+ VP56ParseVectorModels parse_vector_models;
+ VP56ParseCoeffModels parse_coeff_models;
+ VP56ParseHeader parse_header;
+
+ /* for "slice" parallelism between YUV and A */
+ VP56Context *alpha_context;
+
+ VP56Model *modelp;
+ VP56Model model;
+
+ /* huffman decoding */
+ int use_huffman;
+ GetBitContext gb;
+ VLC dccv_vlc[2];
+ VLC runv_vlc[2];
+ VLC ract_vlc[2][3][6];
+ unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
+
+ int have_undamaged_frame;
+ int discard_frame;
+};
+
+
+int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
+int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
+ int flip, int has_alpha);
+int ff_vp56_free(AVCodecContext *avctx);
+int ff_vp56_free_context(VP56Context *s);
+void ff_vp56_init_dequant(VP56Context *s, int quantizer);
+int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+ AVPacket *avpkt);
+
+
+/**
+ * vp56 specific range coder implementation
+ */
+
+extern const uint8_t ff_vp56_norm_shift[256];
+int ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);
+
+/**
+ * vp5689 returns 1 if the end of the stream has been reached, 0 otherwise.
+ */
+static av_always_inline int vpX_rac_is_end(VP56RangeCoder *c)
+{
+ if (c->end <= c->buffer && c->bits >= 0)
+ c->end_reached ++;
+ return c->end_reached > 10;
+}
+
+static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
+{
+ int shift = ff_vp56_norm_shift[c->high];
+ int bits = c->bits;
+ unsigned int code_word = c->code_word;
+
+ c->high <<= shift;
+ code_word <<= shift;
+ bits += shift;
+ if(bits >= 0 && c->buffer < c->end) {
+ code_word |= bytestream_get_be16(&c->buffer) << bits;
+ bits -= 16;
+ }
+ c->bits = bits;
+ return code_word;
+}
+
+#if ARCH_ARM
+#include "arm/vp56_arith.h"
+#elif ARCH_X86
+#include "x86/vp56_arith.h"
+#endif
+
+#ifndef vp56_rac_get_prob
+#define vp56_rac_get_prob vp56_rac_get_prob
+static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
+{
+ unsigned int code_word = vp56_rac_renorm(c);
+ unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
+ unsigned int low_shift = low << 16;
+ int bit = code_word >= low_shift;
+
+ c->high = bit ? c->high - low : low;
+ c->code_word = bit ? code_word - low_shift : code_word;
+
+ return bit;
+}
+#endif
+
+#ifndef vp56_rac_get_prob_branchy
+// branchy variant, to be used where there's a branch based on the bit decoded
+static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
+{
+ unsigned long code_word = vp56_rac_renorm(c);
+ unsigned low = 1 + (((c->high - 1) * prob) >> 8);
+ unsigned low_shift = low << 16;
+
+ if (code_word >= low_shift) {
+ c->high -= low;
+ c->code_word = code_word - low_shift;
+ return 1;
+ }
+
+ c->high = low;
+ c->code_word = code_word;
+ return 0;
+}
+#endif
+
+static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
+{
+ unsigned int code_word = vp56_rac_renorm(c);
+ /* equiprobable */
+ int low = (c->high + 1) >> 1;
+ unsigned int low_shift = low << 16;
+ int bit = code_word >= low_shift;
+ if (bit) {
+ c->high -= low;
+ code_word -= low_shift;
+ } else {
+ c->high = low;
+ }
+
+ c->code_word = code_word;
+ return bit;
+}
+
+// rounding is different than vp56_rac_get, is vp56_rac_get wrong?
+static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
+{
+ return vp56_rac_get_prob(c, 128);
+}
+
+static int vp56_rac_gets(VP56RangeCoder *c, int bits)
+{
+ int value = 0;
+
+ while (bits--) {
+ value = (value << 1) | vp56_rac_get(c);
+ }
+
+ return value;
+}
+
+static int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
+{
+ int value = 0;
+
+ while (bits--) {
+ value = (value << 1) | vp8_rac_get(c);
+ }
+
+ return value;
+}
+
+// fixme: add 1 bit to all the calls to this?
+static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
+{
+ int v;
+
+ if (!vp8_rac_get(c))
+ return 0;
+
+ v = vp8_rac_get_uint(c, bits);
+
+ if (vp8_rac_get(c))
+ v = -v;
+
+ return v;
+}
+
+// P(7)
+static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
+{
+ int v = vp56_rac_gets(c, 7) << 1;
+ return v + !v;
+}
+
+static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
+{
+ int v = vp8_rac_get_uint(c, 7) << 1;
+ return v + !v;
+}
+
+static av_always_inline
+int vp56_rac_get_tree(VP56RangeCoder *c,
+ const VP56Tree *tree,
+ const uint8_t *probs)
+{
+ while (tree->val > 0) {
+ if (vp56_rac_get_prob_branchy(c, probs[tree->prob_idx]))
+ tree += tree->val;
+ else
+ tree++;
+ }
+ return -tree->val;
+}
+
+// how probabilities are associated with decisions is different I think
+// well, the new scheme fits in the old but this way has one fewer branches per decision
+static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
+ const uint8_t *probs)
+{
+ int i = 0;
+
+ do {
+ i = tree[i][vp56_rac_get_prob(c, probs[i])];
+ } while (i > 0);
+
+ return -i;
+}
+
+// DCTextra
+static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob)
+{
+ int v = 0;
+
+ do {
+ v = (v<<1) + vp56_rac_get_prob(c, *prob++);
+ } while (*prob);
+
+ return v;
+}
+
+#endif /* AVCODEC_VP56_H */
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