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 rv34.h
  24  * RV30 and RV40 decoder common data declarations
  25  */
  26
  27 #ifndef FFMPEG_RV34_H
  28 #define FFMPEG_RV34_H
  29
  30 #include "avcodec.h"
  31 #include "dsputil.h"
  32 #include "mpegvideo.h"
  33
  34 #include "h264pred.h"
  35
  36 /**
  37  * RV30 and RV40 Macroblock types
  38  */
  39 enum RV40BlockTypes{
  40     RV34_MB_TYPE_INTRA,      ///< Intra macroblock
  41     RV34_MB_TYPE_INTRA16x16, ///< Intra macroblock with DCs in a separate 4x4 block
  42     RV34_MB_P_16x16,         ///< P-frame macroblock, one motion frame
  43     RV34_MB_P_8x8,           ///< P-frame macroblock, 8x8 motion compensation partitions
  44     RV34_MB_B_FORWARD,       ///< B-frame macroblock, forward prediction
  45     RV34_MB_B_BACKWARD,      ///< B-frame macroblock, backward prediction
  46     RV34_MB_SKIP,            ///< Skipped block
  47     RV34_MB_B_DIRECT,        ///< Bidirectionally predicted B-frame macroblock, no motion vectors
  48     RV34_MB_P_16x8,          ///< P-frame macroblock, 16x8 motion compensation partitions
  49     RV34_MB_P_8x16,          ///< P-frame macroblock, 8x16 motion compensation partitions
  50     RV34_MB_B_BIDIR,         ///< Bidirectionally predicted B-frame macroblock, two motion vectors
  51     RV34_MB_P_MIX16x16,      ///< P-frame macroblock with DCs in a separate 4x4 block, one motion vector
  52     RV34_MB_TYPES
  53 };
  54
  55 /**
  56  * VLC tables used by the decoder
  57  *
  58  * Intra frame VLC sets do not contain some of those tables.
  59  */
  60 typedef struct RV34VLC{
  61     VLC cbppattern[2];     ///< VLCs used for pattern of coded block patterns decoding
  62     VLC cbp[2][4];         ///< VLCs used for coded block patterns decoding
  63     VLC first_pattern[4];  ///< VLCs used for decoding coefficients in the first subblock
  64     VLC second_pattern[2]; ///< VLCs used for decoding coefficients in the subblocks 2 and 3
  65     VLC third_pattern[2];  ///< VLCs used for decoding coefficients in the last subblock
  66     VLC coefficient;       ///< VLCs used for decoding big coefficients
  67 }RV34VLC;
  68
  69 /** essential slice information */
  70 typedef struct SliceInfo{
  71     int type;              ///< slice type (intra, inter)
  72     int quant;             ///< quantizer used for this slice
  73     int vlc_set;           ///< VLCs used for this slice
  74     int start, end;        ///< start and end macroblocks of the slice
  75     int width;             ///< coded width
  76     int height;            ///< coded height
  77     int pts;               ///< frame timestamp
  78 }SliceInfo;
  79
  80 /** decoder context */
  81 typedef struct RV34DecContext{
  82     MpegEncContext s;
  83     int8_t *intra_types_hist;///< old block types, used for prediction
  84     int8_t *intra_types;     ///< block types
  85     const uint8_t *luma_dc_quant_i;///< luma subblock DC quantizer for intraframes
  86     const uint8_t *luma_dc_quant_p;///< luma subblock DC quantizer for interframes
  87
  88     RV34VLC *cur_vlcs;       ///< VLC set used for current frame decoding
  89     int bits;                ///< slice size in bits
  90     H264PredContext h;       ///< functions for 4x4 and 16x16 intra block prediction
  91     SliceInfo si;            ///< current slice information
  92
  93     int *mb_type;            ///< internal macroblock types
  94     int block_type;          ///< current block type
  95     int luma_vlc;            ///< which VLC set will be used for decoding of luma blocks
  96     int chroma_vlc;          ///< which VLC set will be used for decoding of chroma blocks
  97     int is16;                ///< current block has additional 16x16 specific features or not
  98     int dmv[4][2];           ///< differential motion vectors for the current macroblock
  99
 100     int rv30;                ///< indicates which RV variasnt is currently decoded
 101     int rpr;                 ///< one field size in RV30 slice header
 102
 103     int cur_pts, last_pts, next_pts;
 104
 105     uint16_t *cbp_luma;      ///< CBP values for luma subblocks
 106     uint8_t  *cbp_chroma;    ///< CBP values for chroma subblocks
 107
 108     /** 8x8 block available flags (for MV prediction) */
 109     DECLARE_ALIGNED_8(uint32_t, avail_cache[3*4]);
 110
 111     int (*parse_slice_header)(struct RV34DecContext *r, GetBitContext *gb, SliceInfo *si);
 112     int (*decode_mb_info)(struct RV34DecContext *r);
 113     int (*decode_intra_types)(struct RV34DecContext *r, GetBitContext *gb, int8_t *dst);
 114     void (*loop_filter)(struct RV34DecContext *r);
 115 }RV34DecContext;
 116
 117 /**
 118  * common decoding functions
 119  */
 120 int ff_rv34_get_start_offset(GetBitContext *gb, int blocks);
 121 int ff_rv34_decode_init(AVCodecContext *avctx);
 122 int ff_rv34_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size);
 123 int ff_rv34_decode_end(AVCodecContext *avctx);
 124
 125 #endif /* FFMPEG_RV34_H */