mirror of https://git.ffmpeg.org/ffmpeg.git
130 lines
5.5 KiB
C
130 lines
5.5 KiB
C
/*
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* RV30/40 decoder common data declarations
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* Copyright (c) 2007 Mike Melanson, Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file rv34.h
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* RV30 and RV40 decoder common data declarations
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*/
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#ifndef AVCODEC_RV34_H
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#define AVCODEC_RV34_H
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#include "h264pred.h"
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#define MB_TYPE_SEPARATE_DC 0x01000000
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#define IS_SEPARATE_DC(a) ((a) & MB_TYPE_SEPARATE_DC)
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/**
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* RV30 and RV40 Macroblock types
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*/
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enum RV40BlockTypes{
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RV34_MB_TYPE_INTRA, ///< Intra macroblock
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RV34_MB_TYPE_INTRA16x16, ///< Intra macroblock with DCs in a separate 4x4 block
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RV34_MB_P_16x16, ///< P-frame macroblock, one motion frame
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RV34_MB_P_8x8, ///< P-frame macroblock, 8x8 motion compensation partitions
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RV34_MB_B_FORWARD, ///< B-frame macroblock, forward prediction
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RV34_MB_B_BACKWARD, ///< B-frame macroblock, backward prediction
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RV34_MB_SKIP, ///< Skipped block
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RV34_MB_B_DIRECT, ///< Bidirectionally predicted B-frame macroblock, no motion vectors
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RV34_MB_P_16x8, ///< P-frame macroblock, 16x8 motion compensation partitions
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RV34_MB_P_8x16, ///< P-frame macroblock, 8x16 motion compensation partitions
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RV34_MB_B_BIDIR, ///< Bidirectionally predicted B-frame macroblock, two motion vectors
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RV34_MB_P_MIX16x16, ///< P-frame macroblock with DCs in a separate 4x4 block, one motion vector
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RV34_MB_TYPES
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};
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/**
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* VLC tables used by the decoder
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*
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* Intra frame VLC sets do not contain some of those tables.
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*/
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typedef struct RV34VLC{
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VLC cbppattern[2]; ///< VLCs used for pattern of coded block patterns decoding
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VLC cbp[2][4]; ///< VLCs used for coded block patterns decoding
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VLC first_pattern[4]; ///< VLCs used for decoding coefficients in the first subblock
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VLC second_pattern[2]; ///< VLCs used for decoding coefficients in the subblocks 2 and 3
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VLC third_pattern[2]; ///< VLCs used for decoding coefficients in the last subblock
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VLC coefficient; ///< VLCs used for decoding big coefficients
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}RV34VLC;
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/** essential slice information */
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typedef struct SliceInfo{
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int type; ///< slice type (intra, inter)
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int quant; ///< quantizer used for this slice
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int vlc_set; ///< VLCs used for this slice
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int start, end; ///< start and end macroblocks of the slice
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int width; ///< coded width
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int height; ///< coded height
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int pts; ///< frame timestamp
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}SliceInfo;
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/** decoder context */
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typedef struct RV34DecContext{
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MpegEncContext s;
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int8_t *intra_types_hist;///< old block types, used for prediction
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int8_t *intra_types; ///< block types
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const uint8_t *luma_dc_quant_i;///< luma subblock DC quantizer for intraframes
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const uint8_t *luma_dc_quant_p;///< luma subblock DC quantizer for interframes
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RV34VLC *cur_vlcs; ///< VLC set used for current frame decoding
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int bits; ///< slice size in bits
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H264PredContext h; ///< functions for 4x4 and 16x16 intra block prediction
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SliceInfo si; ///< current slice information
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int *mb_type; ///< internal macroblock types
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int block_type; ///< current block type
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int luma_vlc; ///< which VLC set will be used for decoding of luma blocks
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int chroma_vlc; ///< which VLC set will be used for decoding of chroma blocks
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int is16; ///< current block has additional 16x16 specific features or not
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int dmv[4][2]; ///< differential motion vectors for the current macroblock
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int rv30; ///< indicates which RV variasnt is currently decoded
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int rpr; ///< one field size in RV30 slice header
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int cur_pts, last_pts, next_pts;
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uint16_t *cbp_luma; ///< CBP values for luma subblocks
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uint8_t *cbp_chroma; ///< CBP values for chroma subblocks
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int *deblock_coefs; ///< deblock coefficients for each macroblock
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/** 8x8 block available flags (for MV prediction) */
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DECLARE_ALIGNED_8(uint32_t, avail_cache[3*4]);
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int (*parse_slice_header)(struct RV34DecContext *r, GetBitContext *gb, SliceInfo *si);
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int (*decode_mb_info)(struct RV34DecContext *r);
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int (*decode_intra_types)(struct RV34DecContext *r, GetBitContext *gb, int8_t *dst);
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void (*loop_filter)(struct RV34DecContext *r);
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}RV34DecContext;
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/**
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* common decoding functions
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*/
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int ff_rv34_get_start_offset(GetBitContext *gb, int blocks);
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int ff_rv34_decode_init(AVCodecContext *avctx);
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int ff_rv34_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size);
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int ff_rv34_decode_end(AVCodecContext *avctx);
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#endif /* AVCODEC_RV34_H */
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