libavcodec/rv34.h

   1 /*
   2  * RV30/40 decoder common data declarations
   3  * Copyright (c) 2007 Mike Melanson, Konstantin Shishkov
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * RV30 and RV40 decoder common data declarations
  25  */
  26
  27 #ifndef AVCODEC_RV34_H
  28 #define AVCODEC_RV34_H
  29
  30 #include "libavutil/mem_internal.h"
  31
  32 #include "avcodec.h"
  33 #include "mpegvideo.h"
  34
  35 #include "h264pred.h"
  36 #include "rv34dsp.h"
  37
  38 #define MB_TYPE_SEPARATE_DC 0x01000000
  39 #define IS_SEPARATE_DC(a)   ((a) & MB_TYPE_SEPARATE_DC)
  40
  41 /**
  42  * RV30 and RV40 Macroblock types
  43  */
  44 enum RV40BlockTypes{
  45     RV34_MB_TYPE_INTRA,      ///< Intra macroblock
  46     RV34_MB_TYPE_INTRA16x16, ///< Intra macroblock with DCs in a separate 4x4 block
  47     RV34_MB_P_16x16,         ///< P-frame macroblock, one motion frame
  48     RV34_MB_P_8x8,           ///< P-frame macroblock, 8x8 motion compensation partitions
  49     RV34_MB_B_FORWARD,       ///< B-frame macroblock, forward prediction
  50     RV34_MB_B_BACKWARD,      ///< B-frame macroblock, backward prediction
  51     RV34_MB_SKIP,            ///< Skipped block
  52     RV34_MB_B_DIRECT,        ///< Bidirectionally predicted B-frame macroblock, no motion vectors
  53     RV34_MB_P_16x8,          ///< P-frame macroblock, 16x8 motion compensation partitions
  54     RV34_MB_P_8x16,          ///< P-frame macroblock, 8x16 motion compensation partitions
  55     RV34_MB_B_BIDIR,         ///< Bidirectionally predicted B-frame macroblock, two motion vectors
  56     RV34_MB_P_MIX16x16,      ///< P-frame macroblock with DCs in a separate 4x4 block, one motion vector
  57     RV34_MB_TYPES
  58 };
  59
  60 /**
  61  * VLC tables used by the decoder
  62  *
  63  * Intra frame VLC sets do not contain some of those tables.
  64  */
  65 typedef struct RV34VLC{
  66     const VLCElem *cbppattern[2];     ///< VLCs used for pattern of coded block patterns decoding
  67     VLC cbp[2][4];                    ///< VLCs used for coded block patterns decoding
  68     const VLCElem *first_pattern[4];  ///< VLCs used for decoding coefficients in the first subblock
  69     const VLCElem *second_pattern[2]; ///< VLCs used for decoding coefficients in the subblocks 2 and 3
  70     const VLCElem *third_pattern[2];  ///< VLCs used for decoding coefficients in the last subblock
  71     const VLCElem *coefficient;       ///< VLCs used for decoding big coefficients
  72 }RV34VLC;
  73
  74 /** essential slice information */
  75 typedef struct SliceInfo{
  76     int type;              ///< slice type (intra, inter)
  77     int quant;             ///< quantizer used for this slice
  78     int vlc_set;           ///< VLCs used for this slice
  79     int start, end;        ///< start and end macroblocks of the slice
  80     int width;             ///< coded width
  81     int height;            ///< coded height
  82     int pts;               ///< frame timestamp
  83 }SliceInfo;
  84
  85 /** decoder context */
  86 typedef struct RV34DecContext{
  87     MpegEncContext s;
  88     RV34DSPContext rdsp;
  89     int8_t *intra_types_hist;///< old block types, used for prediction
  90     int8_t *intra_types;     ///< block types
  91     int    intra_types_stride;///< block types array stride
  92     const uint8_t *luma_dc_quant_i;///< luma subblock DC quantizer for intraframes
  93     const uint8_t *luma_dc_quant_p;///< luma subblock DC quantizer for interframes
  94
  95     const RV34VLC *cur_vlcs; ///< VLC set used for current frame decoding
  96     H264PredContext h;       ///< functions for 4x4 and 16x16 intra block prediction
  97     SliceInfo si;            ///< current slice information
  98
  99     int *mb_type;            ///< internal macroblock types
 100     int block_type;          ///< current block type
 101     int luma_vlc;            ///< which VLC set will be used for decoding of luma blocks
 102     int chroma_vlc;          ///< which VLC set will be used for decoding of chroma blocks
 103     int is16;                ///< current block has additional 16x16 specific features or not
 104     int dmv[4][2];           ///< differential motion vectors for the current macroblock
 105
 106     int rv30;                ///< indicates which RV variant is currently decoded
 107     int max_rpr;
 108
 109     int cur_pts, last_pts, next_pts;
 110     int scaled_weight;
 111     int weight1, weight2;    ///< B-frame distance fractions (0.14) used in motion compensation
 112     int mv_weight1, mv_weight2;
 113
 114     int orig_width, orig_height;
 115
 116     uint16_t *cbp_luma;      ///< CBP values for luma subblocks
 117     uint8_t  *cbp_chroma;    ///< CBP values for chroma subblocks
 118     uint16_t *deblock_coefs; ///< deblock coefficients for each macroblock
 119
 120     /** 8x8 block available flags (for MV prediction) */
 121     DECLARE_ALIGNED(8, uint32_t, avail_cache)[3*4];
 122
 123     /** temporary blocks for RV4 weighted MC */
 124     uint8_t *tmp_b_block_y[2];
 125     uint8_t *tmp_b_block_uv[4];
 126     uint8_t *tmp_b_block_base;
 127
 128     int (*parse_slice_header)(struct RV34DecContext *r, GetBitContext *gb, SliceInfo *si);
 129     int (*decode_mb_info)(struct RV34DecContext *r);
 130     int (*decode_intra_types)(struct RV34DecContext *r, GetBitContext *gb, int8_t *dst);
 131     void (*loop_filter)(struct RV34DecContext *r, int row);
 132 }RV34DecContext;
 133
 134 /**
 135  * common decoding functions
 136  */
 137 int ff_rv34_get_start_offset(GetBitContext *gb, int blocks);
 138 int ff_rv34_decode_init(AVCodecContext *avctx);
 139 int ff_rv34_decode_frame(AVCodecContext *avctx, AVFrame *frame,
 140                          int *got_frame, AVPacket *avpkt);
 141 int ff_rv34_decode_end(AVCodecContext *avctx);
 142 int ff_rv34_decode_update_thread_context(AVCodecContext *dst, const AVCodecContext *src);
 143
 144 #endif /* AVCODEC_RV34_H */