mirror of
https://git.videolan.org/git/ffmpeg.git
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704 lines
21 KiB
C
704 lines
21 KiB
C
/*
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* Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (C) 2006 Robert Edele <yartrebo@earthlink.net>
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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_SNOW_H
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#define AVCODEC_SNOW_H
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#include "dsputil.h"
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#include "hpeldsp.h"
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#include "snow_dwt.h"
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#include "rangecoder.h"
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#include "mathops.h"
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#include "mpegvideo.h"
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#include "h264qpel.h"
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#define MID_STATE 128
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#define MAX_PLANES 4
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#define QSHIFT 5
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#define QROOT (1<<QSHIFT)
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#define LOSSLESS_QLOG -128
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#define FRAC_BITS 4
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#define MAX_REF_FRAMES 8
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#define LOG2_OBMC_MAX 8
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#define OBMC_MAX (1<<(LOG2_OBMC_MAX))
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typedef struct BlockNode{
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int16_t mx;
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int16_t my;
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uint8_t ref;
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uint8_t color[3];
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uint8_t type;
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//#define TYPE_SPLIT 1
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#define BLOCK_INTRA 1
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#define BLOCK_OPT 2
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//#define TYPE_NOCOLOR 4
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uint8_t level; //FIXME merge into type?
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}BlockNode;
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static const BlockNode null_block= { //FIXME add border maybe
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.color= {128,128,128},
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.mx= 0,
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.my= 0,
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.ref= 0,
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.type= 0,
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.level= 0,
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};
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#define LOG2_MB_SIZE 4
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#define MB_SIZE (1<<LOG2_MB_SIZE)
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#define ENCODER_EXTRA_BITS 4
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#define HTAPS_MAX 8
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typedef struct x_and_coeff{
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int16_t x;
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uint16_t coeff;
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} x_and_coeff;
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typedef struct SubBand{
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int level;
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int stride;
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int width;
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int height;
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int qlog; ///< log(qscale)/log[2^(1/6)]
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DWTELEM *buf;
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IDWTELEM *ibuf;
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int buf_x_offset;
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int buf_y_offset;
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int stride_line; ///< Stride measured in lines, not pixels.
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x_and_coeff * x_coeff;
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struct SubBand *parent;
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uint8_t state[/*7*2*/ 7 + 512][32];
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}SubBand;
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typedef struct Plane{
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int width;
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int height;
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SubBand band[MAX_DECOMPOSITIONS][4];
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int htaps;
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int8_t hcoeff[HTAPS_MAX/2];
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int diag_mc;
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int fast_mc;
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int last_htaps;
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int8_t last_hcoeff[HTAPS_MAX/2];
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int last_diag_mc;
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}Plane;
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typedef struct SnowContext{
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AVClass *class;
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AVCodecContext *avctx;
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RangeCoder c;
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DSPContext dsp;
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HpelDSPContext hdsp;
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VideoDSPContext vdsp;
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H264QpelContext h264qpel;
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SnowDWTContext dwt;
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AVFrame new_picture;
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AVFrame input_picture; ///< new_picture with the internal linesizes
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AVFrame current_picture;
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AVFrame last_picture[MAX_REF_FRAMES];
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uint8_t *halfpel_plane[MAX_REF_FRAMES][4][4];
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AVFrame mconly_picture;
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// uint8_t q_context[16];
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uint8_t header_state[32];
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uint8_t block_state[128 + 32*128];
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int keyframe;
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int always_reset;
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int version;
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int spatial_decomposition_type;
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int last_spatial_decomposition_type;
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int temporal_decomposition_type;
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int spatial_decomposition_count;
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int last_spatial_decomposition_count;
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int temporal_decomposition_count;
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int max_ref_frames;
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int ref_frames;
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int16_t (*ref_mvs[MAX_REF_FRAMES])[2];
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uint32_t *ref_scores[MAX_REF_FRAMES];
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DWTELEM *spatial_dwt_buffer;
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DWTELEM *temp_dwt_buffer;
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IDWTELEM *spatial_idwt_buffer;
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IDWTELEM *temp_idwt_buffer;
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int *run_buffer;
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int colorspace_type;
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int chroma_h_shift;
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int chroma_v_shift;
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int spatial_scalability;
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int qlog;
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int last_qlog;
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int lambda;
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int lambda2;
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int pass1_rc;
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int mv_scale;
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int last_mv_scale;
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int qbias;
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int last_qbias;
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#define QBIAS_SHIFT 3
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int b_width;
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int b_height;
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int block_max_depth;
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int last_block_max_depth;
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Plane plane[MAX_PLANES];
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BlockNode *block;
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#define ME_CACHE_SIZE 1024
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unsigned me_cache[ME_CACHE_SIZE];
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unsigned me_cache_generation;
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slice_buffer sb;
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int memc_only;
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int no_bitstream;
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MpegEncContext m; // needed for motion estimation, should not be used for anything else, the idea is to eventually make the motion estimation independent of MpegEncContext, so this will be removed then (FIXME/XXX)
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uint8_t *scratchbuf;
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uint8_t *emu_edge_buffer;
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}SnowContext;
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/* Tables */
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extern const uint8_t * const ff_obmc_tab[4];
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extern uint8_t ff_qexp[QROOT];
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extern int ff_scale_mv_ref[MAX_REF_FRAMES][MAX_REF_FRAMES];
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/* C bits used by mmx/sse2/altivec */
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static av_always_inline void snow_interleave_line_header(int * i, int width, IDWTELEM * low, IDWTELEM * high){
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(*i) = (width) - 2;
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if (width & 1){
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low[(*i)+1] = low[((*i)+1)>>1];
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(*i)--;
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}
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}
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static av_always_inline void snow_interleave_line_footer(int * i, IDWTELEM * low, IDWTELEM * high){
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for (; (*i)>=0; (*i)-=2){
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low[(*i)+1] = high[(*i)>>1];
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low[*i] = low[(*i)>>1];
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}
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}
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static av_always_inline void snow_horizontal_compose_lift_lead_out(int i, IDWTELEM * dst, IDWTELEM * src, IDWTELEM * ref, int width, int w, int lift_high, int mul, int add, int shift){
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for(; i<w; i++){
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dst[i] = src[i] - ((mul * (ref[i] + ref[i + 1]) + add) >> shift);
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}
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if((width^lift_high)&1){
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dst[w] = src[w] - ((mul * 2 * ref[w] + add) >> shift);
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}
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}
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static av_always_inline void snow_horizontal_compose_liftS_lead_out(int i, IDWTELEM * dst, IDWTELEM * src, IDWTELEM * ref, int width, int w){
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for(; i<w; i++){
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dst[i] = src[i] + ((ref[i] + ref[(i+1)]+W_BO + 4 * src[i]) >> W_BS);
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}
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if(width&1){
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dst[w] = src[w] + ((2 * ref[w] + W_BO + 4 * src[w]) >> W_BS);
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}
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}
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/* common code */
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int ff_snow_common_init(AVCodecContext *avctx);
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int ff_snow_common_init_after_header(AVCodecContext *avctx);
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void ff_snow_common_end(SnowContext *s);
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void ff_snow_release_buffer(AVCodecContext *avctx);
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void ff_snow_reset_contexts(SnowContext *s);
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int ff_snow_alloc_blocks(SnowContext *s);
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int ff_snow_frame_start(SnowContext *s);
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void ff_snow_pred_block(SnowContext *s, uint8_t *dst, uint8_t *tmp, int stride,
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int sx, int sy, int b_w, int b_h, BlockNode *block,
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int plane_index, int w, int h);
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/* common inline functions */
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//XXX doublecheck all of them should stay inlined
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static inline void snow_set_blocks(SnowContext *s, int level, int x, int y, int l, int cb, int cr, int mx, int my, int ref, int type){
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const int w= s->b_width << s->block_max_depth;
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const int rem_depth= s->block_max_depth - level;
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const int index= (x + y*w) << rem_depth;
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const int block_w= 1<<rem_depth;
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BlockNode block;
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int i,j;
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block.color[0]= l;
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block.color[1]= cb;
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block.color[2]= cr;
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block.mx= mx;
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block.my= my;
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block.ref= ref;
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block.type= type;
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block.level= level;
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for(j=0; j<block_w; j++){
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for(i=0; i<block_w; i++){
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s->block[index + i + j*w]= block;
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}
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}
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}
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static inline void pred_mv(SnowContext *s, int *mx, int *my, int ref,
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const BlockNode *left, const BlockNode *top, const BlockNode *tr){
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if(s->ref_frames == 1){
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*mx = mid_pred(left->mx, top->mx, tr->mx);
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*my = mid_pred(left->my, top->my, tr->my);
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}else{
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const int *scale = ff_scale_mv_ref[ref];
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*mx = mid_pred((left->mx * scale[left->ref] + 128) >>8,
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(top ->mx * scale[top ->ref] + 128) >>8,
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(tr ->mx * scale[tr ->ref] + 128) >>8);
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*my = mid_pred((left->my * scale[left->ref] + 128) >>8,
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(top ->my * scale[top ->ref] + 128) >>8,
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(tr ->my * scale[tr ->ref] + 128) >>8);
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}
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}
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static av_always_inline int same_block(BlockNode *a, BlockNode *b){
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if((a->type&BLOCK_INTRA) && (b->type&BLOCK_INTRA)){
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return !((a->color[0] - b->color[0]) | (a->color[1] - b->color[1]) | (a->color[2] - b->color[2]));
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}else{
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return !((a->mx - b->mx) | (a->my - b->my) | (a->ref - b->ref) | ((a->type ^ b->type)&BLOCK_INTRA));
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}
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}
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//FIXME name cleanup (b_w, block_w, b_width stuff)
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//XXX should we really inline it?
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static av_always_inline void add_yblock(SnowContext *s, int sliced, slice_buffer *sb, IDWTELEM *dst, uint8_t *dst8, const uint8_t *obmc, int src_x, int src_y, int b_w, int b_h, int w, int h, int dst_stride, int src_stride, int obmc_stride, int b_x, int b_y, int add, int offset_dst, int plane_index){
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const int b_width = s->b_width << s->block_max_depth;
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const int b_height= s->b_height << s->block_max_depth;
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const int b_stride= b_width;
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BlockNode *lt= &s->block[b_x + b_y*b_stride];
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BlockNode *rt= lt+1;
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BlockNode *lb= lt+b_stride;
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BlockNode *rb= lb+1;
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uint8_t *block[4];
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int tmp_step= src_stride >= 7*MB_SIZE ? MB_SIZE : MB_SIZE*src_stride;
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uint8_t *tmp = s->scratchbuf;
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uint8_t *ptmp;
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int x,y;
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if(b_x<0){
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lt= rt;
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lb= rb;
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}else if(b_x + 1 >= b_width){
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rt= lt;
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rb= lb;
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}
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if(b_y<0){
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lt= lb;
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rt= rb;
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}else if(b_y + 1 >= b_height){
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lb= lt;
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rb= rt;
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}
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if(src_x<0){ //FIXME merge with prev & always round internal width up to *16
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obmc -= src_x;
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b_w += src_x;
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if(!sliced && !offset_dst)
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dst -= src_x;
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src_x=0;
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}else if(src_x + b_w > w){
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b_w = w - src_x;
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}
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if(src_y<0){
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obmc -= src_y*obmc_stride;
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b_h += src_y;
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if(!sliced && !offset_dst)
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dst -= src_y*dst_stride;
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src_y=0;
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}else if(src_y + b_h> h){
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b_h = h - src_y;
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}
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if(b_w<=0 || b_h<=0) return;
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av_assert2(src_stride > 2*MB_SIZE + 5);
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if(!sliced && offset_dst)
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dst += src_x + src_y*dst_stride;
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dst8+= src_x + src_y*src_stride;
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// src += src_x + src_y*src_stride;
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ptmp= tmp + 3*tmp_step;
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block[0]= ptmp;
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ptmp+=tmp_step;
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ff_snow_pred_block(s, block[0], tmp, src_stride, src_x, src_y, b_w, b_h, lt, plane_index, w, h);
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if(same_block(lt, rt)){
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block[1]= block[0];
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}else{
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block[1]= ptmp;
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ptmp+=tmp_step;
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ff_snow_pred_block(s, block[1], tmp, src_stride, src_x, src_y, b_w, b_h, rt, plane_index, w, h);
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}
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if(same_block(lt, lb)){
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block[2]= block[0];
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}else if(same_block(rt, lb)){
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block[2]= block[1];
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}else{
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block[2]= ptmp;
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ptmp+=tmp_step;
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ff_snow_pred_block(s, block[2], tmp, src_stride, src_x, src_y, b_w, b_h, lb, plane_index, w, h);
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}
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if(same_block(lt, rb) ){
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block[3]= block[0];
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}else if(same_block(rt, rb)){
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block[3]= block[1];
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}else if(same_block(lb, rb)){
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block[3]= block[2];
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}else{
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block[3]= ptmp;
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ff_snow_pred_block(s, block[3], tmp, src_stride, src_x, src_y, b_w, b_h, rb, plane_index, w, h);
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}
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if(sliced){
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s->dwt.inner_add_yblock(obmc, obmc_stride, block, b_w, b_h, src_x,src_y, src_stride, sb, add, dst8);
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}else{
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for(y=0; y<b_h; y++){
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//FIXME ugly misuse of obmc_stride
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const uint8_t *obmc1= obmc + y*obmc_stride;
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const uint8_t *obmc2= obmc1+ (obmc_stride>>1);
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const uint8_t *obmc3= obmc1+ obmc_stride*(obmc_stride>>1);
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const uint8_t *obmc4= obmc3+ (obmc_stride>>1);
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for(x=0; x<b_w; x++){
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int v= obmc1[x] * block[3][x + y*src_stride]
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+obmc2[x] * block[2][x + y*src_stride]
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+obmc3[x] * block[1][x + y*src_stride]
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+obmc4[x] * block[0][x + y*src_stride];
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v <<= 8 - LOG2_OBMC_MAX;
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if(FRAC_BITS != 8){
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v >>= 8 - FRAC_BITS;
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}
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if(add){
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v += dst[x + y*dst_stride];
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v = (v + (1<<(FRAC_BITS-1))) >> FRAC_BITS;
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if(v&(~255)) v= ~(v>>31);
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dst8[x + y*src_stride] = v;
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}else{
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dst[x + y*dst_stride] -= v;
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}
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}
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}
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}
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}
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static av_always_inline void predict_slice(SnowContext *s, IDWTELEM *buf, int plane_index, int add, int mb_y){
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Plane *p= &s->plane[plane_index];
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const int mb_w= s->b_width << s->block_max_depth;
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const int mb_h= s->b_height << s->block_max_depth;
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int x, y, mb_x;
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int block_size = MB_SIZE >> s->block_max_depth;
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int block_w = plane_index ? block_size>>s->chroma_h_shift : block_size;
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int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
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const uint8_t *obmc = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];
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const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
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int ref_stride= s->current_picture.linesize[plane_index];
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uint8_t *dst8= s->current_picture.data[plane_index];
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int w= p->width;
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int h= p->height;
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av_assert2(s->chroma_h_shift == s->chroma_v_shift); // obmc params assume squares
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if(s->keyframe || (s->avctx->debug&512)){
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if(mb_y==mb_h)
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return;
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if(add){
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for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){
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for(x=0; x<w; x++){
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int v= buf[x + y*w] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1));
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v >>= FRAC_BITS;
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if(v&(~255)) v= ~(v>>31);
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dst8[x + y*ref_stride]= v;
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}
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}
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}else{
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for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){
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for(x=0; x<w; x++){
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buf[x + y*w]-= 128<<FRAC_BITS;
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}
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}
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}
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return;
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}
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for(mb_x=0; mb_x<=mb_w; mb_x++){
|
|
add_yblock(s, 0, NULL, buf, dst8, obmc,
|
|
block_w*mb_x - block_w/2,
|
|
block_h*mb_y - block_h/2,
|
|
block_w, block_h,
|
|
w, h,
|
|
w, ref_stride, obmc_stride,
|
|
mb_x - 1, mb_y - 1,
|
|
add, 1, plane_index);
|
|
}
|
|
}
|
|
|
|
static av_always_inline void predict_plane(SnowContext *s, IDWTELEM *buf, int plane_index, int add){
|
|
const int mb_h= s->b_height << s->block_max_depth;
|
|
int mb_y;
|
|
for(mb_y=0; mb_y<=mb_h; mb_y++)
|
|
predict_slice(s, buf, plane_index, add, mb_y);
|
|
}
|
|
|
|
static inline void set_blocks(SnowContext *s, int level, int x, int y, int l, int cb, int cr, int mx, int my, int ref, int type){
|
|
const int w= s->b_width << s->block_max_depth;
|
|
const int rem_depth= s->block_max_depth - level;
|
|
const int index= (x + y*w) << rem_depth;
|
|
const int block_w= 1<<rem_depth;
|
|
const int block_h= 1<<rem_depth; //FIXME "w!=h"
|
|
BlockNode block;
|
|
int i,j;
|
|
|
|
block.color[0]= l;
|
|
block.color[1]= cb;
|
|
block.color[2]= cr;
|
|
block.mx= mx;
|
|
block.my= my;
|
|
block.ref= ref;
|
|
block.type= type;
|
|
block.level= level;
|
|
|
|
for(j=0; j<block_h; j++){
|
|
for(i=0; i<block_w; i++){
|
|
s->block[index + i + j*w]= block;
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void init_ref(MotionEstContext *c, uint8_t *src[3], uint8_t *ref[3], uint8_t *ref2[3], int x, int y, int ref_index){
|
|
SnowContext *s = c->avctx->priv_data;
|
|
const int offset[3]= {
|
|
y*c-> stride + x,
|
|
((y*c->uvstride + x)>>s->chroma_h_shift),
|
|
((y*c->uvstride + x)>>s->chroma_h_shift),
|
|
};
|
|
int i;
|
|
for(i=0; i<3; i++){
|
|
c->src[0][i]= src [i];
|
|
c->ref[0][i]= ref [i] + offset[i];
|
|
}
|
|
av_assert2(!ref_index);
|
|
}
|
|
|
|
|
|
/* bitstream functions */
|
|
|
|
extern const int8_t ff_quant3bA[256];
|
|
|
|
#define QEXPSHIFT (7-FRAC_BITS+8) //FIXME try to change this to 0
|
|
|
|
static inline void put_symbol(RangeCoder *c, uint8_t *state, int v, int is_signed){
|
|
int i;
|
|
|
|
if(v){
|
|
const int a= FFABS(v);
|
|
const int e= av_log2(a);
|
|
const int el= FFMIN(e, 10);
|
|
put_rac(c, state+0, 0);
|
|
|
|
for(i=0; i<el; i++){
|
|
put_rac(c, state+1+i, 1); //1..10
|
|
}
|
|
for(; i<e; i++){
|
|
put_rac(c, state+1+9, 1); //1..10
|
|
}
|
|
put_rac(c, state+1+FFMIN(i,9), 0);
|
|
|
|
for(i=e-1; i>=el; i--){
|
|
put_rac(c, state+22+9, (a>>i)&1); //22..31
|
|
}
|
|
for(; i>=0; i--){
|
|
put_rac(c, state+22+i, (a>>i)&1); //22..31
|
|
}
|
|
|
|
if(is_signed)
|
|
put_rac(c, state+11 + el, v < 0); //11..21
|
|
}else{
|
|
put_rac(c, state+0, 1);
|
|
}
|
|
}
|
|
|
|
static inline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed){
|
|
if(get_rac(c, state+0))
|
|
return 0;
|
|
else{
|
|
int i, e, a;
|
|
e= 0;
|
|
while(get_rac(c, state+1 + FFMIN(e,9))){ //1..10
|
|
e++;
|
|
}
|
|
|
|
a= 1;
|
|
for(i=e-1; i>=0; i--){
|
|
a += a + get_rac(c, state+22 + FFMIN(i,9)); //22..31
|
|
}
|
|
|
|
e= -(is_signed && get_rac(c, state+11 + FFMIN(e,10))); //11..21
|
|
return (a^e)-e;
|
|
}
|
|
}
|
|
|
|
static inline void put_symbol2(RangeCoder *c, uint8_t *state, int v, int log2){
|
|
int i;
|
|
int r= log2>=0 ? 1<<log2 : 1;
|
|
|
|
av_assert2(v>=0);
|
|
av_assert2(log2>=-4);
|
|
|
|
while(v >= r){
|
|
put_rac(c, state+4+log2, 1);
|
|
v -= r;
|
|
log2++;
|
|
if(log2>0) r+=r;
|
|
}
|
|
put_rac(c, state+4+log2, 0);
|
|
|
|
for(i=log2-1; i>=0; i--){
|
|
put_rac(c, state+31-i, (v>>i)&1);
|
|
}
|
|
}
|
|
|
|
static inline int get_symbol2(RangeCoder *c, uint8_t *state, int log2){
|
|
int i;
|
|
int r= log2>=0 ? 1<<log2 : 1;
|
|
int v=0;
|
|
|
|
av_assert2(log2>=-4);
|
|
|
|
while(log2<28 && get_rac(c, state+4+log2)){
|
|
v+= r;
|
|
log2++;
|
|
if(log2>0) r+=r;
|
|
}
|
|
|
|
for(i=log2-1; i>=0; i--){
|
|
v+= get_rac(c, state+31-i)<<i;
|
|
}
|
|
|
|
return v;
|
|
}
|
|
|
|
static inline void unpack_coeffs(SnowContext *s, SubBand *b, SubBand * parent, int orientation){
|
|
const int w= b->width;
|
|
const int h= b->height;
|
|
int x,y;
|
|
|
|
int run, runs;
|
|
x_and_coeff *xc= b->x_coeff;
|
|
x_and_coeff *prev_xc= NULL;
|
|
x_and_coeff *prev2_xc= xc;
|
|
x_and_coeff *parent_xc= parent ? parent->x_coeff : NULL;
|
|
x_and_coeff *prev_parent_xc= parent_xc;
|
|
|
|
runs= get_symbol2(&s->c, b->state[30], 0);
|
|
if(runs-- > 0) run= get_symbol2(&s->c, b->state[1], 3);
|
|
else run= INT_MAX;
|
|
|
|
for(y=0; y<h; y++){
|
|
int v=0;
|
|
int lt=0, t=0, rt=0;
|
|
|
|
if(y && prev_xc->x == 0){
|
|
rt= prev_xc->coeff;
|
|
}
|
|
for(x=0; x<w; x++){
|
|
int p=0;
|
|
const int l= v;
|
|
|
|
lt= t; t= rt;
|
|
|
|
if(y){
|
|
if(prev_xc->x <= x)
|
|
prev_xc++;
|
|
if(prev_xc->x == x + 1)
|
|
rt= prev_xc->coeff;
|
|
else
|
|
rt=0;
|
|
}
|
|
if(parent_xc){
|
|
if(x>>1 > parent_xc->x){
|
|
parent_xc++;
|
|
}
|
|
if(x>>1 == parent_xc->x){
|
|
p= parent_xc->coeff;
|
|
}
|
|
}
|
|
if(/*ll|*/l|lt|t|rt|p){
|
|
int context= av_log2(/*FFABS(ll) + */3*(l>>1) + (lt>>1) + (t&~1) + (rt>>1) + (p>>1));
|
|
|
|
v=get_rac(&s->c, &b->state[0][context]);
|
|
if(v){
|
|
v= 2*(get_symbol2(&s->c, b->state[context + 2], context-4) + 1);
|
|
v+=get_rac(&s->c, &b->state[0][16 + 1 + 3 + ff_quant3bA[l&0xFF] + 3*ff_quant3bA[t&0xFF]]);
|
|
|
|
xc->x=x;
|
|
(xc++)->coeff= v;
|
|
}
|
|
}else{
|
|
if(!run){
|
|
if(runs-- > 0) run= get_symbol2(&s->c, b->state[1], 3);
|
|
else run= INT_MAX;
|
|
v= 2*(get_symbol2(&s->c, b->state[0 + 2], 0-4) + 1);
|
|
v+=get_rac(&s->c, &b->state[0][16 + 1 + 3]);
|
|
|
|
xc->x=x;
|
|
(xc++)->coeff= v;
|
|
}else{
|
|
int max_run;
|
|
run--;
|
|
v=0;
|
|
av_assert2(run >= 0);
|
|
if(y) max_run= FFMIN(run, prev_xc->x - x - 2);
|
|
else max_run= FFMIN(run, w-x-1);
|
|
if(parent_xc)
|
|
max_run= FFMIN(max_run, 2*parent_xc->x - x - 1);
|
|
av_assert2(max_run >= 0 && max_run <= run);
|
|
|
|
x+= max_run;
|
|
run-= max_run;
|
|
}
|
|
}
|
|
}
|
|
(xc++)->x= w+1; //end marker
|
|
prev_xc= prev2_xc;
|
|
prev2_xc= xc;
|
|
|
|
if(parent_xc){
|
|
if(y&1){
|
|
while(parent_xc->x != parent->width+1)
|
|
parent_xc++;
|
|
parent_xc++;
|
|
prev_parent_xc= parent_xc;
|
|
}else{
|
|
parent_xc= prev_parent_xc;
|
|
}
|
|
}
|
|
}
|
|
|
|
(xc++)->x= w+1; //end marker
|
|
}
|
|
|
|
#endif /* AVCODEC_SNOW_H */
|