libavcodec/vp56.h - third_party/ffmpeg - Git at Google

 /*
  * 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 "libavutil/mem_internal.h"

 #include "avcodec.h"
 #include "get_bits.h"
 #include "hpeldsp.h"
 #include "h264chroma.h"
 #include "videodsp.h"
 #include "vp3dsp.h"
 #include "vp56dsp.h"
 #include "vpx_rac.h"

 typedef struct vp56_context VP56Context;

 typedef enum {
     VP56_FRAME_NONE     =-1,
     VP56_FRAME_CURRENT  = 0,
     VP56_FRAME_PREVIOUS = 1,
     VP56_FRAME_GOLDEN   = 2,
 } 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 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;
     VPXRangeCoder c;
     VPXRangeCoder cc;
     VPXRangeCoder *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;
 };


 /**
  * Initializes an VP56Context. Expects its caller to clean up
  * in case of error.
  */
 int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
                           int flip, int has_alpha);
 int ff_vp56_free_context(VP56Context *s);
 void ff_vp56_init_dequant(VP56Context *s, int quantizer);
 int ff_vp56_decode_frame(AVCodecContext *avctx, AVFrame *frame,
                          int *got_frame, AVPacket *avpkt);


 /**
  * vp56 specific range coder implementation
  */

 static int vp56_rac_gets(VPXRangeCoder *c, int bits)
 {
     int value = 0;

     while (bits--) {
         value = (value << 1) | vpx_rac_get(c);
     }

     return value;
 }

 // P(7)
 static av_unused int vp56_rac_gets_nn(VPXRangeCoder *c, int bits)
 {
     int v = vp56_rac_gets(c, 7) << 1;
     return v + !v;
 }

 static av_always_inline
 int vp56_rac_get_tree(VPXRangeCoder *c,
                       const VP56Tree *tree,
                       const uint8_t *probs)
 {
     while (tree->val > 0) {
         if (vpx_rac_get_prob_branchy(c, probs[tree->prob_idx]))
             tree += tree->val;
         else
             tree++;
     }
     return -tree->val;
 }

 #endif /* AVCODEC_VP56_H */
	/*
	* 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 "libavutil/mem_internal.h"

	#include "avcodec.h"
	#include "get_bits.h"
	#include "hpeldsp.h"
	#include "h264chroma.h"
	#include "videodsp.h"
	#include "vp3dsp.h"
	#include "vp56dsp.h"
	#include "vpx_rac.h"

	typedef struct vp56_context VP56Context;

	typedef enum {
	VP56_FRAME_NONE =-1,
	VP56_FRAME_CURRENT = 0,
	VP56_FRAME_PREVIOUS = 1,
	VP56_FRAME_GOLDEN = 2,
	} 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 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;
	VPXRangeCoder c;
	VPXRangeCoder cc;
	VPXRangeCoder *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;
	};


	/**
	* Initializes an VP56Context. Expects its caller to clean up
	* in case of error.
	*/
	int ff_vp56_init_context(AVCodecContext avctx, VP56Context s,
	int flip, int has_alpha);
	int ff_vp56_free_context(VP56Context *s);
	void ff_vp56_init_dequant(VP56Context *s, int quantizer);
	int ff_vp56_decode_frame(AVCodecContext avctx, AVFrame frame,
	int got_frame, AVPacket avpkt);


	/**
	* vp56 specific range coder implementation
	*/

	static int vp56_rac_gets(VPXRangeCoder *c, int bits)
	{
	int value = 0;

	while (bits--) {
	value = (value << 1) \| vpx_rac_get(c);
	}

	return value;
	}

	// P(7)
	static av_unused int vp56_rac_gets_nn(VPXRangeCoder *c, int bits)
	{
	int v = vp56_rac_gets(c, 7) << 1;
	return v + !v;
	}

	static av_always_inline
	int vp56_rac_get_tree(VPXRangeCoder *c,
	const VP56Tree *tree,
	const uint8_t *probs)
	{
	while (tree->val > 0) {
	if (vpx_rac_get_prob_branchy(c, probs[tree->prob_idx]))
	tree += tree->val;
	else
	tree++;
	}
	return -tree->val;
	}

	#endif /* AVCODEC_VP56_H */