mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-25 12:40:01 +00:00
114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
/*
|
|
* JPEG-LS common code
|
|
* Copyright (c) 2003 Michael Niedermayer
|
|
* Copyright (c) 2006 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
|
|
* JPEG-LS common code.
|
|
*/
|
|
|
|
#ifndef AVCODEC_JPEGLS_H
|
|
#define AVCODEC_JPEGLS_H
|
|
|
|
#include "avcodec.h"
|
|
|
|
typedef struct JpeglsContext{
|
|
AVCodecContext *avctx;
|
|
AVFrame picture;
|
|
}JpeglsContext;
|
|
|
|
typedef struct JLSState{
|
|
int T1, T2, T3;
|
|
int A[367], B[367], C[365], N[367];
|
|
int limit, reset, bpp, qbpp, maxval, range;
|
|
int near, twonear;
|
|
int run_index[3];
|
|
}JLSState;
|
|
|
|
extern const uint8_t ff_log2_run[32];
|
|
|
|
/**
|
|
* Calculate initial JPEG-LS parameters
|
|
*/
|
|
void ff_jpegls_init_state(JLSState *state);
|
|
|
|
/**
|
|
* Calculate quantized gradient value, used for context determination
|
|
*/
|
|
static inline int ff_jpegls_quantize(JLSState *s, int v){ //FIXME optimize
|
|
if(v==0) return 0;
|
|
if(v < 0){
|
|
if(v <= -s->T3) return -4;
|
|
if(v <= -s->T2) return -3;
|
|
if(v <= -s->T1) return -2;
|
|
if(v < -s->near) return -1;
|
|
return 0;
|
|
}else{
|
|
if(v <= s->near) return 0;
|
|
if(v < s->T1) return 1;
|
|
if(v < s->T2) return 2;
|
|
if(v < s->T3) return 3;
|
|
return 4;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Calculate JPEG-LS codec values
|
|
*/
|
|
void ff_jpegls_reset_coding_parameters(JLSState *s, int reset_all);
|
|
|
|
|
|
static inline void ff_jpegls_downscale_state(JLSState *state, int Q){
|
|
if(state->N[Q] == state->reset){
|
|
state->A[Q] >>=1;
|
|
state->B[Q] >>=1;
|
|
state->N[Q] >>=1;
|
|
}
|
|
state->N[Q]++;
|
|
}
|
|
|
|
static inline int ff_jpegls_update_state_regular(JLSState *state, int Q, int err){
|
|
if(FFABS(err) > 0xFFFF)
|
|
return -0x10000;
|
|
state->A[Q] += FFABS(err);
|
|
err *= state->twonear;
|
|
state->B[Q] += err;
|
|
|
|
ff_jpegls_downscale_state(state, Q);
|
|
|
|
if(state->B[Q] <= -state->N[Q]) {
|
|
state->B[Q]= FFMAX(state->B[Q] + state->N[Q], 1-state->N[Q]);
|
|
if(state->C[Q] > -128)
|
|
state->C[Q]--;
|
|
}else if(state->B[Q] > 0){
|
|
state->B[Q]= FFMIN(state->B[Q] - state->N[Q], 0);
|
|
if(state->C[Q] < 127)
|
|
state->C[Q]++;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
#define R(a, i ) (bits == 8 ? ((uint8_t*)(a))[i] : ((uint16_t*)(a))[i] )
|
|
#define W(a, i, v) (bits == 8 ? (((uint8_t*)(a))[i]=v) : (((uint16_t*)(a))[i]=v))
|
|
|
|
#endif /* AVCODEC_JPEGLS_H */
|