mirror of https://github.com/FFmpeg/FFmpeg.git
Jason Garrett-Glaser
14 years ago
parent
7634771e70
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bcf4568f18
3 changed files with 248 additions and 213 deletions
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/**
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* VP8 compatible video decoder |
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* |
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* Copyright (C) 2010 David Conrad |
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* Copyright (C) 2010 Ronald S. Bultje |
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* Copyright (C) 2010 Jason Garrett-Glaser |
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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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#ifndef AVCODEC_VP8_H |
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#define AVCODEC_VP8_H |
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#include "vp56.h" |
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#include "vp56data.h" |
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#include "vp8dsp.h" |
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#include "h264pred.h" |
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#define VP8_MAX_QUANT 127 |
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enum dct_token { |
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DCT_0, |
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DCT_1, |
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DCT_2, |
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DCT_3, |
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DCT_4, |
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DCT_CAT1, |
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DCT_CAT2, |
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DCT_CAT3, |
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DCT_CAT4, |
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DCT_CAT5, |
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DCT_CAT6, |
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DCT_EOB, |
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NUM_DCT_TOKENS |
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}; |
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// used to signal 4x4 intra pred in luma MBs
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#define MODE_I4x4 4 |
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enum inter_mvmode { |
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VP8_MVMODE_ZERO = MODE_I4x4 + 1, |
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VP8_MVMODE_MV, |
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VP8_MVMODE_SPLIT |
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}; |
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enum inter_splitmvmode { |
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VP8_SPLITMVMODE_16x8 = 0, ///< 2 16x8 blocks (vertical)
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VP8_SPLITMVMODE_8x16, ///< 2 8x16 blocks (horizontal)
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VP8_SPLITMVMODE_8x8, ///< 2x2 blocks of 8x8px each
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VP8_SPLITMVMODE_4x4, ///< 4x4 blocks of 4x4px each
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VP8_SPLITMVMODE_NONE, ///< (only used in prediction) no split MVs
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}; |
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typedef struct { |
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uint8_t filter_level; |
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uint8_t inner_limit; |
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uint8_t inner_filter; |
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} VP8FilterStrength; |
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typedef struct { |
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uint8_t skip; |
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// todo: make it possible to check for at least (i4x4 or split_mv)
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// in one op. are others needed?
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uint8_t mode; |
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uint8_t ref_frame; |
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uint8_t partitioning; |
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VP56mv mv; |
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VP56mv bmv[16]; |
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} VP8Macroblock; |
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typedef struct { |
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AVCodecContext *avctx; |
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DSPContext dsp; |
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VP8DSPContext vp8dsp; |
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H264PredContext hpc; |
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vp8_mc_func put_pixels_tab[3][3][3]; |
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AVFrame frames[4]; |
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AVFrame *framep[4]; |
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uint8_t *edge_emu_buffer; |
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VP56RangeCoder c; ///< header context, includes mb modes and motion vectors
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int profile; |
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int mb_width; /* number of horizontal MB */ |
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int mb_height; /* number of vertical MB */ |
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int linesize; |
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int uvlinesize; |
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int keyframe; |
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int invisible; |
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int update_last; ///< update VP56_FRAME_PREVIOUS with the current one
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int update_golden; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so
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int update_altref; |
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int deblock_filter; |
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/**
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* If this flag is not set, all the probability updates |
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* are discarded after this frame is decoded. |
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*/ |
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int update_probabilities; |
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/**
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* All coefficients are contained in separate arith coding contexts. |
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* There can be 1, 2, 4, or 8 of these after the header context. |
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*/ |
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int num_coeff_partitions; |
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VP56RangeCoder coeff_partition[8]; |
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VP8Macroblock *macroblocks; |
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VP8Macroblock *macroblocks_base; |
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VP8FilterStrength *filter_strength; |
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uint8_t *intra4x4_pred_mode_top; |
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uint8_t intra4x4_pred_mode_left[4]; |
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uint8_t *segmentation_map; |
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/**
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* Cache of the top row needed for intra prediction |
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* 16 for luma, 8 for each chroma plane |
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*/ |
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uint8_t (*top_border)[16+8+8]; |
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/**
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* For coeff decode, we need to know whether the above block had non-zero |
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* coefficients. This means for each macroblock, we need data for 4 luma |
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* blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9 |
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* per macroblock. We keep the last row in top_nnz. |
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*/ |
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uint8_t (*top_nnz)[9]; |
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DECLARE_ALIGNED(8, uint8_t, left_nnz)[9]; |
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/**
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* This is the index plus one of the last non-zero coeff |
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* for each of the blocks in the current macroblock. |
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* So, 0 -> no coeffs |
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* 1 -> dc-only (special transform) |
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* 2+-> full transform |
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*/ |
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DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4]; |
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DECLARE_ALIGNED(16, DCTELEM, block)[6][4][16]; |
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DECLARE_ALIGNED(16, DCTELEM, block_dc)[16]; |
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uint8_t intra4x4_pred_mode_mb[16]; |
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int chroma_pred_mode; ///< 8x8c pred mode of the current macroblock
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int segment; ///< segment of the current macroblock
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VP56mv mv_min; |
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VP56mv mv_max; |
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int mbskip_enabled; |
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int sign_bias[4]; ///< one state [0, 1] per ref frame type
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int ref_count[3]; |
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/**
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* Base parameters for segmentation, i.e. per-macroblock parameters. |
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* These must be kept unchanged even if segmentation is not used for |
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* a frame, since the values persist between interframes. |
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*/ |
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struct { |
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int enabled; |
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int absolute_vals; |
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int update_map; |
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int8_t base_quant[4]; |
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int8_t filter_level[4]; ///< base loop filter level
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} segmentation; |
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/**
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* Macroblocks can have one of 4 different quants in a frame when |
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* segmentation is enabled. |
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* If segmentation is disabled, only the first segment's values are used. |
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*/ |
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struct { |
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// [0] - DC qmul [1] - AC qmul
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int16_t luma_qmul[2]; |
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int16_t luma_dc_qmul[2]; ///< luma dc-only block quant
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int16_t chroma_qmul[2]; |
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} qmat[4]; |
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struct { |
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int simple; |
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int level; |
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int sharpness; |
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} filter; |
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struct { |
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int enabled; ///< whether each mb can have a different strength based on mode/ref
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/**
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* filter strength adjustment for the following macroblock modes: |
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* [0-3] - i16x16 (always zero) |
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* [4] - i4x4 |
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* [5] - zero mv |
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* [6] - inter modes except for zero or split mv |
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* [7] - split mv |
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* i16x16 modes never have any adjustment |
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*/ |
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int8_t mode[VP8_MVMODE_SPLIT+1]; |
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/**
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* filter strength adjustment for macroblocks that reference: |
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* [0] - intra / VP56_FRAME_CURRENT |
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* [1] - VP56_FRAME_PREVIOUS |
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* [2] - VP56_FRAME_GOLDEN |
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* [3] - altref / VP56_FRAME_GOLDEN2 |
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*/ |
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int8_t ref[4]; |
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} lf_delta; |
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/**
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* These are all of the updatable probabilities for binary decisions. |
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* They are only implictly reset on keyframes, making it quite likely |
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* for an interframe to desync if a prior frame's header was corrupt |
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* or missing outright! |
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*/ |
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struct { |
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uint8_t segmentid[3]; |
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uint8_t mbskip; |
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uint8_t intra; |
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uint8_t last; |
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uint8_t golden; |
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uint8_t pred16x16[4]; |
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uint8_t pred8x8c[3]; |
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/* Padded to allow overreads */ |
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uint8_t token[4][17][3][NUM_DCT_TOKENS-1]; |
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uint8_t mvc[2][19]; |
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} prob[2]; |
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} VP8Context; |
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#endif |
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