mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-11 01:47:55 +02:00
844 lines
24 KiB
C
844 lines
24 KiB
C
/*
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* JPEG-LS encoder and decoder
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* Copyright (c) 2003 Michael Niedermayer
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* Copyright (c) 2006 Konstantin Shishkov
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; 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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#include "golomb.h"
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/**
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* @file jpeg_ls.c
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* JPEG-LS encoder and decoder.
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*/
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typedef struct JpeglsContext{
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AVCodecContext *avctx;
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AVFrame picture;
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}JpeglsContext;
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typedef struct JLSState{
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int T1, T2, T3;
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int A[367], B[367], C[365], N[367];
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int limit, reset, bpp, qbpp, maxval, range;
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int near, twonear;
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int run_index[3];
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}JLSState;
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static const uint8_t log2_run[32]={
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0, 0, 0, 0, 1, 1, 1, 1,
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2, 2, 2, 2, 3, 3, 3, 3,
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4, 4, 5, 5, 6, 6, 7, 7,
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8, 9,10,11,12,13,14,15
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};
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/*
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* Uncomment this to significantly speed up decoding of broken JPEG-LS
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* (or test broken JPEG-LS decoder) and slow down ordinary decoding a bit.
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*
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* There is no Golomb code with length >= 32 bits possible, so check and
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* avoid situation of 32 zeros, FFmpeg Golomb decoder is painfully slow
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* on this errors.
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*/
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//#define JLS_BROKEN
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/********** Functions for both encoder and decoder **********/
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/**
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* Calculate initial JPEG-LS parameters
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*/
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static void ls_init_state(JLSState *state){
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int i;
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state->twonear = state->near * 2 + 1;
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state->range = ((state->maxval + state->twonear - 1) / state->twonear) + 1;
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// QBPP = ceil(log2(RANGE))
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for(state->qbpp = 0; (1 << state->qbpp) < state->range; state->qbpp++);
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if(state->bpp < 8)
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state->limit = 16 + 2 * state->bpp - state->qbpp;
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else
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state->limit = (4 * state->bpp) - state->qbpp;
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for(i = 0; i < 367; i++) {
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state->A[i] = (state->range + 32) >> 6;
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if(state->A[i] < 2)
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state->A[i] = 2;
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state->N[i] = 1;
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}
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}
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/**
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* Calculate quantized gradient value, used for context determination
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*/
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static inline int quantize(JLSState *s, int v){ //FIXME optimize
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if(v==0) return 0;
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if(v < 0){
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if(v <= -s->T3) return -4;
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if(v <= -s->T2) return -3;
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if(v <= -s->T1) return -2;
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if(v < -s->near) return -1;
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return 0;
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}else{
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if(v <= s->near) return 0;
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if(v < s->T1) return 1;
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if(v < s->T2) return 2;
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if(v < s->T3) return 3;
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return 4;
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}
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}
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/**
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* Custom value clipping function used in T1, T2, T3 calculation
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*/
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static inline int iso_clip(int v, int vmin, int vmax){
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if(v > vmax || v < vmin) return vmin;
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else return v;
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}
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/**
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* Calculate JPEG-LS codec values
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*/
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static void reset_ls_coding_parameters(JLSState *s, int reset_all){
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const int basic_t1= 3;
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const int basic_t2= 7;
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const int basic_t3= 21;
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int factor;
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if(s->maxval==0 || reset_all) s->maxval= (1 << s->bpp) - 1;
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if(s->maxval >=128){
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factor= (FFMIN(s->maxval, 4095) + 128)>>8;
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if(s->T1==0 || reset_all)
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s->T1= iso_clip(factor*(basic_t1-2) + 2 + 3*s->near, s->near+1, s->maxval);
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if(s->T2==0 || reset_all)
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s->T2= iso_clip(factor*(basic_t2-3) + 3 + 5*s->near, s->T1, s->maxval);
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if(s->T3==0 || reset_all)
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s->T3= iso_clip(factor*(basic_t3-4) + 4 + 7*s->near, s->T2, s->maxval);
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}else{
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factor= 256 / (s->maxval + 1);
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if(s->T1==0 || reset_all)
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s->T1= iso_clip(FFMAX(2, basic_t1/factor + 3*s->near), s->near+1, s->maxval);
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if(s->T2==0 || reset_all)
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s->T2= iso_clip(FFMAX(3, basic_t2/factor + 5*s->near), s->T1, s->maxval);
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if(s->T3==0 || reset_all)
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s->T3= iso_clip(FFMAX(4, basic_t3/factor + 6*s->near), s->T2, s->maxval);
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}
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if(s->reset==0 || reset_all) s->reset= 64;
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// av_log(NULL, AV_LOG_DEBUG, "[JPEG-LS RESET] T=%i,%i,%i\n", s->T1, s->T2, s->T3);
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}
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/********** Decoder-specific functions **********/
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/**
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* Decode LSE block with initialization parameters
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*/
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static int decode_lse(MJpegDecodeContext *s)
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{
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int len, id;
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/* XXX: verify len field validity */
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len = get_bits(&s->gb, 16);
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id = get_bits(&s->gb, 8);
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switch(id){
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case 1:
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s->maxval= get_bits(&s->gb, 16);
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s->t1= get_bits(&s->gb, 16);
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s->t2= get_bits(&s->gb, 16);
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s->t3= get_bits(&s->gb, 16);
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s->reset= get_bits(&s->gb, 16);
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// reset_ls_coding_parameters(s, 0);
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//FIXME quant table?
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break;
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case 2:
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case 3:
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av_log(s->avctx, AV_LOG_ERROR, "palette not supported\n");
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return -1;
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case 4:
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av_log(s->avctx, AV_LOG_ERROR, "oversize image not supported\n");
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return -1;
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default:
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av_log(s->avctx, AV_LOG_ERROR, "invalid id %d\n", id);
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return -1;
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}
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// av_log(s->avctx, AV_LOG_DEBUG, "ID=%i, T=%i,%i,%i\n", id, s->t1, s->t2, s->t3);
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return 0;
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}
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/**
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* Get context-dependent Golomb code, decode it and update context
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*/
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static inline int ls_get_code_regular(GetBitContext *gb, JLSState *state, int Q){
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int k, ret;
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for(k = 0; (state->N[Q] << k) < state->A[Q]; k++);
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#ifdef JLS_BROKEN
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if(!show_bits_long(gb, 32))return -1;
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#endif
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ret = get_ur_golomb_jpegls(gb, k, state->limit, state->qbpp);
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/* decode mapped error */
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if(ret & 1)
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ret = -((ret + 1) >> 1);
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else
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ret >>= 1;
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/* for NEAR=0, k=0 and 2*B[Q] <= - N[Q] mapping is reversed */
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if(!state->near && !k && (2 * state->B[Q] <= -state->N[Q]))
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ret = -(ret + 1);
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state->A[Q] += ABS(ret);
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ret *= state->twonear;
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state->B[Q] += ret;
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if(state->N[Q] == state->reset) {
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state->A[Q] >>= 1;
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state->B[Q] >>= 1;
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state->N[Q] >>= 1;
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}
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state->N[Q]++;
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if(state->B[Q] <= -state->N[Q]) {
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state->B[Q] += state->N[Q];
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if(state->C[Q] > -128)
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state->C[Q]--;
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if(state->B[Q] <= -state->N[Q])
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state->B[Q] = -state->N[Q] + 1;
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}else if(state->B[Q] > 0){
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state->B[Q] -= state->N[Q];
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if(state->C[Q] < 127)
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state->C[Q]++;
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if(state->B[Q] > 0)
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state->B[Q] = 0;
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}
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return ret;
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}
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/**
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* Get Golomb code, decode it and update state for run termination
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*/
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static inline int ls_get_code_runterm(GetBitContext *gb, JLSState *state, int RItype, int limit_add){
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int k, ret, temp, map;
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int Q = 365 + RItype;
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if(!RItype)
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temp = state->A[Q];
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else
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temp = state->A[Q] + (state->N[Q] >> 1);
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for(k = 0; (state->N[Q] << k) < temp; k++);
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#ifdef JLS_BROKEN
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if(!show_bits_long(gb, 32))return -1;
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#endif
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ret = get_ur_golomb_jpegls(gb, k, state->limit - limit_add - 1, state->qbpp);
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/* decode mapped error */
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map = 0;
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if(!k && (RItype || ret) && (2 * state->B[Q] < state->N[Q]))
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map = 1;
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ret += RItype + map;
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if(ret & 1){
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ret = map - ((ret + 1) >> 1);
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state->B[Q]++;
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} else {
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ret = ret >> 1;
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}
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/* update state */
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state->A[Q] += ABS(ret) - RItype;
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ret *= state->twonear;
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if(state->N[Q] == state->reset){
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state->A[Q] >>=1;
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state->B[Q] >>=1;
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state->N[Q] >>=1;
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}
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state->N[Q]++;
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return ret;
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}
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/**
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* Decode one line of image
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*/
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static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s, uint8_t *last, uint8_t *dst, int last2, int w, int stride, int comp){
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int i, x = 0;
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int Ra, Rb, Rc, Rd;
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int D0, D1, D2;
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while(x < w) {
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int err, pred;
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/* compute gradients */
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Ra = x ? dst[x - stride] : last[x];
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Rb = last[x];
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Rc = x ? last[x - stride] : last2;
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Rd = (x >= w - stride) ? last[x] : last[x + stride];
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D0 = Rd - Rb;
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D1 = Rb - Rc;
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D2 = Rc - Ra;
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/* run mode */
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if((ABS(D0) <= state->near) && (ABS(D1) <= state->near) && (ABS(D2) <= state->near)) {
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int r;
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int RItype;
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/* decode full runs while available */
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while(get_bits1(&s->gb)) {
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int r;
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r = 1 << log2_run[state->run_index[comp]];
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if(x + r * stride > w) {
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r = (w - x) / stride;
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}
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for(i = 0; i < r; i++) {
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dst[x] = Ra;
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x += stride;
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}
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/* if EOL reached, we stop decoding */
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if(r != (1 << log2_run[state->run_index[comp]]))
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return;
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if(state->run_index[comp] < 31)
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state->run_index[comp]++;
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if(x + stride > w)
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return;
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}
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/* decode aborted run */
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r = log2_run[state->run_index[comp]];
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if(r)
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r = get_bits_long(&s->gb, r);
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for(i = 0; i < r; i++) {
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dst[x] = Ra;
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x += stride;
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}
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/* decode run termination value */
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Rb = last[x];
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RItype = (ABS(Ra - Rb) <= state->near) ? 1 : 0;
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err = ls_get_code_runterm(&s->gb, state, RItype, log2_run[state->run_index[comp]]);
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if(state->run_index[comp])
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state->run_index[comp]--;
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if(state->near && RItype){
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pred = Ra + err;
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} else {
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if(Rb < Ra)
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pred = Rb - err;
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else
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pred = Rb + err;
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}
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if(state->near){
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if(pred < -state->near)
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pred += state->range * state->twonear;
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else if(pred > state->maxval + state->near)
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pred -= state->range * state->twonear;
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pred = clip(pred, 0, state->maxval);
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}
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dst[x] = pred;
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x += stride;
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} else { /* regular mode */
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int context, sign;
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context = quantize(state, D0) * 81 + quantize(state, D1) * 9 + quantize(state, D2);
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pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
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if(context < 0){
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context = -context;
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sign = 1;
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}else{
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sign = 0;
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}
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if(sign){
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pred = clip(pred - state->C[context], 0, state->maxval);
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err = -ls_get_code_regular(&s->gb, state, context);
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} else {
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pred = clip(pred + state->C[context], 0, state->maxval);
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err = ls_get_code_regular(&s->gb, state, context);
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}
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/* we have to do something more for near-lossless coding */
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pred += err;
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if(state->near) {
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if(pred < -state->near)
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pred += state->range * state->twonear;
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else if(pred > state->maxval + state->near)
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pred -= state->range * state->twonear;
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pred = clip(pred, 0, state->maxval);
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}
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dst[x] = pred;
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x += stride;
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}
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}
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}
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static int ls_decode_picture(MJpegDecodeContext *s, int near, int point_transform, int ilv){
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int i, t = 0;
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uint8_t *zero, *last, *cur;
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JLSState *state;
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int off, stride, width;
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zero = av_mallocz(s->picture.linesize[0]);
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last = zero;
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cur = s->picture.data[0];
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state = av_mallocz(sizeof(JLSState));
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/* initialize JPEG-LS state from JPEG parameters */
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state->near = near;
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state->bpp = (s->bits < 2) ? 2 : s->bits;
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state->maxval = s->maxval;
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state->T1 = s->t1;
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state->T2 = s->t2;
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state->T3 = s->t3;
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state->reset = s->reset;
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reset_ls_coding_parameters(state, 0);
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ls_init_state(state);
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// av_log(s->avctx, AV_LOG_DEBUG, "JPEG-LS params: %ix%i NEAR=%i MV=%i T(%i,%i,%i) RESET=%i, LIMIT=%i, qbpp=%i, RANGE=%i\n",s->width,s->height,state->near,state->maxval,state->T1,state->T2,state->T3,state->reset,state->limit,state->qbpp, state->range);
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// av_log(s->avctx, AV_LOG_DEBUG, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n", ilv, point_transform, s->bits, s->cur_scan);
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if(ilv == 0) { /* separate planes */
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off = s->cur_scan - 1;
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stride = (s->nb_components > 1) ? 3 : 1;
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width = s->width * stride;
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cur += off;
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for(i = 0; i < s->height; i++) {
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ls_decode_line(state, s, last, cur, t, width, stride, off);
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t = last[0];
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last = cur;
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cur += s->picture.linesize[0];
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if (s->restart_interval && !--s->restart_count) {
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align_get_bits(&s->gb);
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skip_bits(&s->gb, 16); /* skip RSTn */
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}
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}
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} else if(ilv == 1) { /* line interleaving */
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int j;
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int Rc[3] = {0, 0, 0};
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memset(cur, 0, s->picture.linesize[0]);
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width = s->width * 3;
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for(i = 0; i < s->height; i++) {
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for(j = 0; j < 3; j++) {
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ls_decode_line(state, s, last + j, cur + j, Rc[j], width, 3, j);
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Rc[j] = last[j];
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if (s->restart_interval && !--s->restart_count) {
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align_get_bits(&s->gb);
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skip_bits(&s->gb, 16); /* skip RSTn */
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}
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}
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last = cur;
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cur += s->picture.linesize[0];
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}
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} else if(ilv == 2) { /* sample interleaving */
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av_log(s->avctx, AV_LOG_ERROR, "Sample interleaved images are not supported.\n");
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return -1;
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}
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av_free(state);
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av_free(zero);
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return 0;
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}
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#if defined(CONFIG_ENCODERS) && defined(CONFIG_JPEGLS_ENCODER)
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/********** Encoder-specific functions **********/
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/**
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* Encode error from regular symbol
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*/
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static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q, int err){
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int k;
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int val;
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int map;
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for(k = 0; (state->N[Q] << k) < state->A[Q]; k++);
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map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
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|
|
|
if(err < 0)
|
|
err += state->range;
|
|
if(err >= ((state->range + 1) >> 1)) {
|
|
err -= state->range;
|
|
val = 2 * ABS(err) - 1 - map;
|
|
} else
|
|
val = 2 * err + map;
|
|
|
|
set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
|
|
|
|
state->A[Q] += ABS(err);
|
|
state->B[Q] += err * state->twonear;
|
|
|
|
if(state->N[Q] == state->reset) {
|
|
state->A[Q] >>= 1;
|
|
state->B[Q] >>= 1;
|
|
state->N[Q] >>= 1;
|
|
}
|
|
state->N[Q]++;
|
|
|
|
if(state->B[Q] <= -state->N[Q]) {
|
|
state->B[Q] += state->N[Q];
|
|
if(state->C[Q] > -128)
|
|
state->C[Q]--;
|
|
if(state->B[Q] <= -state->N[Q])
|
|
state->B[Q] = -state->N[Q] + 1;
|
|
}else if(state->B[Q] > 0){
|
|
state->B[Q] -= state->N[Q];
|
|
if(state->C[Q] < 127)
|
|
state->C[Q]++;
|
|
if(state->B[Q] > 0)
|
|
state->B[Q] = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Encode error from run termination
|
|
*/
|
|
static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb, int RItype, int err, int limit_add){
|
|
int k;
|
|
int val, map;
|
|
int Q = 365 + RItype;
|
|
int temp;
|
|
|
|
temp = state->A[Q];
|
|
if(RItype)
|
|
temp += state->N[Q] >> 1;
|
|
for(k = 0; (state->N[Q] << k) < temp; k++);
|
|
map = 0;
|
|
if(!k && err && (2 * state->B[Q] < state->N[Q]))
|
|
map = 1;
|
|
|
|
if(err < 0)
|
|
val = - (2 * err) - 1 - RItype + map;
|
|
else
|
|
val = 2 * err - RItype - map;
|
|
set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
|
|
|
|
if(err < 0)
|
|
state->B[Q]++;
|
|
state->A[Q] += (val + 1 - RItype) >> 1;
|
|
|
|
if(state->N[Q] == state->reset) {
|
|
state->A[Q] >>= 1;
|
|
state->B[Q] >>= 1;
|
|
state->N[Q] >>= 1;
|
|
}
|
|
state->N[Q]++;
|
|
}
|
|
|
|
/**
|
|
* Encode run value as specified by JPEG-LS standard
|
|
*/
|
|
static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run, int comp, int trail){
|
|
while(run >= (1 << log2_run[state->run_index[comp]])){
|
|
put_bits(pb, 1, 1);
|
|
run -= 1 << log2_run[state->run_index[comp]];
|
|
if(state->run_index[comp] < 31)
|
|
state->run_index[comp]++;
|
|
}
|
|
/* if hit EOL, encode another full run, else encode aborted run */
|
|
if(!trail && run) {
|
|
put_bits(pb, 1, 1);
|
|
}else if(trail){
|
|
put_bits(pb, 1, 0);
|
|
if(log2_run[state->run_index[comp]])
|
|
put_bits(pb, log2_run[state->run_index[comp]], run);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Encode one line of image
|
|
*/
|
|
static inline void ls_encode_line(JLSState *state, PutBitContext *pb, uint8_t *last, uint8_t *cur, int last2, int w, int stride, int comp){
|
|
int x = 0;
|
|
int Ra, Rb, Rc, Rd;
|
|
int D0, D1, D2;
|
|
|
|
while(x < w) {
|
|
int err, pred, sign;
|
|
|
|
/* compute gradients */
|
|
Ra = x ? cur[x - stride] : last[x];
|
|
Rb = last[x];
|
|
Rc = x ? last[x - stride] : last2;
|
|
Rd = (x >= w - stride) ? last[x] : last[x + stride];
|
|
D0 = Rd - Rb;
|
|
D1 = Rb - Rc;
|
|
D2 = Rc - Ra;
|
|
|
|
/* run mode */
|
|
if((ABS(D0) <= state->near) && (ABS(D1) <= state->near) && (ABS(D2) <= state->near)) {
|
|
int RUNval, RItype, run;
|
|
|
|
run = 0;
|
|
RUNval = Ra;
|
|
while(x < w && (ABS(cur[x] - RUNval) <= state->near)){
|
|
run++;
|
|
cur[x] = Ra;
|
|
x += stride;
|
|
}
|
|
ls_encode_run(state, pb, run, comp, x < w);
|
|
if(x >= w)
|
|
return;
|
|
Rb = last[x];
|
|
RItype = (ABS(Ra - Rb) <= state->near);
|
|
pred = RItype ? Ra : Rb;
|
|
err = cur[x] - pred;
|
|
|
|
if(!RItype && Ra > Rb)
|
|
err = -err;
|
|
|
|
if(state->near){
|
|
if(err > 0)
|
|
err = (state->near + err) / state->twonear;
|
|
else
|
|
err = -(state->near - err) / state->twonear;
|
|
|
|
if(RItype || (Rb >= Ra))
|
|
Ra = clip(pred + err * state->twonear, 0, state->maxval);
|
|
else
|
|
Ra = clip(pred - err * state->twonear, 0, state->maxval);
|
|
cur[x] = Ra;
|
|
}
|
|
if(err < 0)
|
|
err += state->range;
|
|
if(err >= ((state->range + 1) >> 1))
|
|
err -= state->range;
|
|
|
|
ls_encode_runterm(state, pb, RItype, err, log2_run[state->run_index[comp]]);
|
|
|
|
if(state->run_index[comp] > 0)
|
|
state->run_index[comp]--;
|
|
x += stride;
|
|
} else { /* regular mode */
|
|
int context;
|
|
|
|
context = quantize(state, D0) * 81 + quantize(state, D1) * 9 + quantize(state, D2);
|
|
pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
|
|
|
|
if(context < 0){
|
|
context = -context;
|
|
sign = 1;
|
|
pred = clip(pred - state->C[context], 0, state->maxval);
|
|
err = pred - cur[x];
|
|
}else{
|
|
sign = 0;
|
|
pred = clip(pred + state->C[context], 0, state->maxval);
|
|
err = cur[x] - pred;
|
|
}
|
|
|
|
if(state->near){
|
|
if(err > 0)
|
|
err = (state->near + err) / state->twonear;
|
|
else
|
|
err = -(state->near - err) / state->twonear;
|
|
if(!sign)
|
|
Ra = clip(pred + err * state->twonear, 0, state->maxval);
|
|
else
|
|
Ra = clip(pred - err * state->twonear, 0, state->maxval);
|
|
cur[x] = Ra;
|
|
}
|
|
|
|
ls_encode_regular(state, pb, context, err);
|
|
x += stride;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void ls_store_lse(JLSState *state, PutBitContext *pb){
|
|
/* Test if we have default params and don't need to store LSE */
|
|
JLSState state2;
|
|
memset(&state2, 0, sizeof(JLSState));
|
|
state2.bpp = 8;
|
|
state2.near = state->near;
|
|
reset_ls_coding_parameters(&state2, 1);
|
|
if(state->T1 == state2.T1 && state->T2 == state2.T2 && state->T3 == state2.T3 && state->reset == state2.reset)
|
|
return;
|
|
/* store LSE type 1 */
|
|
put_marker(pb, LSE);
|
|
put_bits(pb, 16, 13);
|
|
put_bits(pb, 8, 1);
|
|
put_bits(pb, 16, state->maxval);
|
|
put_bits(pb, 16, state->T1);
|
|
put_bits(pb, 16, state->T2);
|
|
put_bits(pb, 16, state->T3);
|
|
put_bits(pb, 16, state->reset);
|
|
}
|
|
|
|
static int encode_picture_ls(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
|
|
JpeglsContext * const s = avctx->priv_data;
|
|
AVFrame *pict = data;
|
|
AVFrame * const p= (AVFrame*)&s->picture;
|
|
const int near = avctx->prediction_method;
|
|
PutBitContext pb, pb2;
|
|
GetBitContext gb;
|
|
uint8_t *buf2, *zero, *cur, *last;
|
|
JLSState *state;
|
|
int i, size;
|
|
int comps;
|
|
|
|
buf2 = av_malloc(buf_size);
|
|
|
|
init_put_bits(&pb, buf, buf_size);
|
|
init_put_bits(&pb2, buf2, buf_size);
|
|
|
|
*p = *pict;
|
|
p->pict_type= FF_I_TYPE;
|
|
p->key_frame= 1;
|
|
|
|
comps = (avctx->pix_fmt == PIX_FMT_GRAY8) ? 1 : 3;
|
|
|
|
/* write our own JPEG header, can't use mjpeg_picture_header */
|
|
put_marker(&pb, SOI);
|
|
put_marker(&pb, SOF48);
|
|
put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
|
|
put_bits(&pb, 8, 8); // bpp
|
|
put_bits(&pb, 16, avctx->height);
|
|
put_bits(&pb, 16, avctx->width);
|
|
put_bits(&pb, 8, comps); // components
|
|
for(i = 1; i <= comps; i++) {
|
|
put_bits(&pb, 8, i); // component ID
|
|
put_bits(&pb, 8, 0x11); // subsampling: none
|
|
put_bits(&pb, 8, 0); // Tiq, used by JPEG-LS ext
|
|
}
|
|
|
|
put_marker(&pb, SOS);
|
|
put_bits(&pb, 16, 6 + comps * 2);
|
|
put_bits(&pb, 8, comps);
|
|
for(i = 1; i <= comps; i++) {
|
|
put_bits(&pb, 8, i); // component ID
|
|
put_bits(&pb, 8, 0); // mapping index: none
|
|
}
|
|
put_bits(&pb, 8, near);
|
|
put_bits(&pb, 8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
|
|
put_bits(&pb, 8, 0); // point transform: none
|
|
|
|
state = av_mallocz(sizeof(JLSState));
|
|
/* initialize JPEG-LS state from JPEG parameters */
|
|
state->near = near;
|
|
state->bpp = 8;
|
|
reset_ls_coding_parameters(state, 0);
|
|
ls_init_state(state);
|
|
|
|
ls_store_lse(state, &pb);
|
|
|
|
zero = av_mallocz(p->linesize[0]);
|
|
last = zero;
|
|
cur = p->data[0];
|
|
if(avctx->pix_fmt == PIX_FMT_GRAY8){
|
|
int t = 0;
|
|
|
|
for(i = 0; i < avctx->height; i++) {
|
|
ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0);
|
|
t = last[0];
|
|
last = cur;
|
|
cur += p->linesize[0];
|
|
}
|
|
}else if(avctx->pix_fmt == PIX_FMT_RGB24){
|
|
int j, width;
|
|
int Rc[3] = {0, 0, 0};
|
|
|
|
width = avctx->width * 3;
|
|
for(i = 0; i < avctx->height; i++) {
|
|
for(j = 0; j < 3; j++) {
|
|
ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j);
|
|
Rc[j] = last[j];
|
|
}
|
|
last = cur;
|
|
cur += s->picture.linesize[0];
|
|
}
|
|
}else if(avctx->pix_fmt == PIX_FMT_BGR24){
|
|
int j, width;
|
|
int Rc[3] = {0, 0, 0};
|
|
|
|
width = avctx->width * 3;
|
|
for(i = 0; i < avctx->height; i++) {
|
|
for(j = 2; j >= 0; j--) {
|
|
ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j);
|
|
Rc[j] = last[j];
|
|
}
|
|
last = cur;
|
|
cur += s->picture.linesize[0];
|
|
}
|
|
}
|
|
|
|
av_free(zero);
|
|
av_free(state);
|
|
|
|
flush_put_bits(&pb2);
|
|
/* do escape coding */
|
|
size = put_bits_count(&pb2) >> 3;
|
|
init_get_bits(&gb, buf2, size);
|
|
while(get_bits_count(&gb) < size * 8){
|
|
int v;
|
|
v = get_bits(&gb, 8);
|
|
put_bits(&pb, 8, v);
|
|
if(v == 0xFF){
|
|
v = get_bits(&gb, 7);
|
|
put_bits(&pb, 8, v);
|
|
}
|
|
}
|
|
align_put_bits(&pb);
|
|
av_free(buf2);
|
|
|
|
/* End of image */
|
|
put_marker(&pb, EOI);
|
|
flush_put_bits(&pb);
|
|
|
|
emms_c();
|
|
|
|
return put_bits_count(&pb) >> 3;
|
|
}
|
|
|
|
static int encode_init_ls(AVCodecContext *ctx) {
|
|
JpeglsContext *c = (JpeglsContext*)ctx->priv_data;
|
|
|
|
c->avctx = ctx;
|
|
ctx->coded_frame = &c->picture;
|
|
|
|
if(ctx->pix_fmt != PIX_FMT_GRAY8 && ctx->pix_fmt != PIX_FMT_RGB24 && ctx->pix_fmt != PIX_FMT_BGR24){
|
|
av_log(ctx, AV_LOG_ERROR, "Only grayscale and RGB24/BGR24 images are supported\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
AVCodec jpegls_encoder = { //FIXME avoid MPV_* lossless jpeg shouldnt need them
|
|
"jpegls",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_JPEGLS,
|
|
sizeof(JpeglsContext),
|
|
encode_init_ls,
|
|
encode_picture_ls,
|
|
NULL,
|
|
.pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB24, PIX_FMT_GRAY8, -1},
|
|
};
|
|
#endif
|