RV30/40 decoding core

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@11229 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/rv34.h

+/*
+ * 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 */