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/*
* RV30/40 decoder common data declarations
* Copyright (c) 2007 Mike Melanson, Konstantin Shishkov
*
* 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 rv34.h
* RV30 and RV40 decoder common data declarations
*/
#ifndef FFMPEG_RV34_H
#define FFMPEG_RV34_H
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "h264pred.h"
/**
* RV30 and RV40 Macroblock types
*/
enum RV40BlockTypes{
RV34_MB_TYPE_INTRA, ///< Intra macroblock
RV34_MB_TYPE_INTRA16x16, ///< Intra macroblock with DCs in a separate 4x4 block
RV34_MB_P_16x16, ///< P-frame macroblock, one motion frame
RV34_MB_P_8x8, ///< P-frame macroblock, 8x8 motion compensation partitions
RV34_MB_B_FORWARD, ///< B-frame macroblock, forward prediction
RV34_MB_B_BACKWARD, ///< B-frame macroblock, backward prediction
RV34_MB_SKIP, ///< Skipped block
RV34_MB_B_DIRECT, ///< Bidirectionally predicted B-frame macroblock, no motion vectors
RV34_MB_P_16x8, ///< P-frame macroblock, 16x8 motion compensation partitions
RV34_MB_P_8x16, ///< P-frame macroblock, 8x16 motion compensation partitions
RV34_MB_B_BIDIR, ///< Bidirectionally predicted B-frame macroblock, two motion vectors
RV34_MB_P_MIX16x16, ///< P-frame macroblock with DCs in a separate 4x4 block, one motion vector
RV34_MB_TYPES
};
/**
* VLC tables used by the decoder
*
* Intra frame VLC sets do not contain some of those tables.
*/
typedef struct RV34VLC{
VLC cbppattern[2]; ///< VLCs used for pattern of coded block patterns decoding
VLC cbp[2][4]; ///< VLCs used for coded block patterns decoding
VLC first_pattern[4]; ///< VLCs used for decoding coefficients in the first subblock
VLC second_pattern[2]; ///< VLCs used for decoding coefficients in the subblocks 2 and 3
VLC third_pattern[2]; ///< VLCs used for decoding coefficients in the last subblock
VLC coefficient; ///< VLCs used for decoding big coefficients
}RV34VLC;
/** essential slice information */
typedef struct SliceInfo{
int type; ///< slice type (intra, inter)
int quant; ///< quantizer used for this slice
int vlc_set; ///< VLCs used for this slice
int start, end; ///< start and end macroblocks of the slice
int width; ///< coded width
int height; ///< coded height
}SliceInfo;
/** decoder context */
typedef struct RV34DecContext{
MpegEncContext s;
int8_t *intra_types_hist;///< old block types, used for prediction
int8_t *intra_types; ///< block types
uint8_t *luma_dc_quant_i;///< luma subblock DC quantizer for intraframes
uint8_t *luma_dc_quant_p;///< luma subblock DC quantizer for interframes
RV34VLC *cur_vlcs; ///< VLC set used for current frame decoding
int bits; ///< slice size in bits
H264PredContext h; ///< functions for 4x4 and 16x16 intra block prediction
SliceInfo si; ///< current slice information
int *mb_type; ///< internal macroblock types
int block_type; ///< current block type
int luma_vlc; ///< which VLC set will be used for decoding of luma blocks
int chroma_vlc; ///< which VLC set will be used for decoding of chroma blocks
int is16; ///< current block has additional 16x16 specific features or not
int dmv[4][2]; ///< differential motion vectors for the current macroblock
int rv30; ///< indicates which RV variasnt is currently decoded
int rpr; ///< one field size in RV30 slice header
/** 8x8 block available flags (for MV prediction) */
DECLARE_ALIGNED_8(uint32_t, avail_cache[3*4]);
int (*parse_slice_header)(struct RV34DecContext *r, GetBitContext *gb, SliceInfo *si);
int (*decode_mb_info)(struct RV34DecContext *r);
int (*decode_intra_types)(struct RV34DecContext *r, GetBitContext *gb, int8_t *dst);
void (*loop_filter)(struct RV34DecContext *r);
}RV34DecContext;
/**
* common decoding functions
*/
int ff_rv34_get_start_offset(GetBitContext *gb, int blocks);
int ff_rv34_decode_init(AVCodecContext *avctx);
int ff_rv34_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size);
int ff_rv34_decode_end(AVCodecContext *avctx);
#endif /* FFMPEG_RV34_H */
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