diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/jpeg_ls.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/jpeg_ls.c | 855 |
1 files changed, 855 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/jpeg_ls.c b/contrib/ffmpeg/libavcodec/jpeg_ls.c new file mode 100644 index 000000000..1b4df2b1a --- /dev/null +++ b/contrib/ffmpeg/libavcodec/jpeg_ls.c @@ -0,0 +1,855 @@ +/* + * JPEG-LS encoder and decoder + * 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 + */ + +#include "golomb.h" + +/** + * @file jpeg_ls.c + * JPEG-LS encoder and decoder. + */ + +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; + +static const uint8_t log2_run[32]={ + 0, 0, 0, 0, 1, 1, 1, 1, + 2, 2, 2, 2, 3, 3, 3, 3, + 4, 4, 5, 5, 6, 6, 7, 7, + 8, 9,10,11,12,13,14,15 +}; + +/* +* Uncomment this to significantly speed up decoding of broken JPEG-LS +* (or test broken JPEG-LS decoder) and slow down ordinary decoding a bit. +* +* There is no Golomb code with length >= 32 bits possible, so check and +* avoid situation of 32 zeros, FFmpeg Golomb decoder is painfully slow +* on this errors. +*/ +//#define JLS_BROKEN + +/********** Functions for both encoder and decoder **********/ + +/** + * Calculate initial JPEG-LS parameters + */ +static void ls_init_state(JLSState *state){ + int i; + + state->twonear = state->near * 2 + 1; + state->range = ((state->maxval + state->twonear - 1) / state->twonear) + 1; + + // QBPP = ceil(log2(RANGE)) + for(state->qbpp = 0; (1 << state->qbpp) < state->range; state->qbpp++); + + if(state->bpp < 8) + state->limit = 16 + 2 * state->bpp - state->qbpp; + else + state->limit = (4 * state->bpp) - state->qbpp; + + for(i = 0; i < 367; i++) { + state->A[i] = FFMAX((state->range + 32) >> 6, 2); + state->N[i] = 1; + } + +} + +/** + * Calculate quantized gradient value, used for context determination + */ +static inline int 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; + } +} + +/** + * Custom value clipping function used in T1, T2, T3 calculation + */ +static inline int iso_clip(int v, int vmin, int vmax){ + if(v > vmax || v < vmin) return vmin; + else return v; +} + +/** + * Calculate JPEG-LS codec values + */ +static void reset_ls_coding_parameters(JLSState *s, int reset_all){ + const int basic_t1= 3; + const int basic_t2= 7; + const int basic_t3= 21; + int factor; + + if(s->maxval==0 || reset_all) s->maxval= (1 << s->bpp) - 1; + + if(s->maxval >=128){ + factor= (FFMIN(s->maxval, 4095) + 128)>>8; + + if(s->T1==0 || reset_all) + s->T1= iso_clip(factor*(basic_t1-2) + 2 + 3*s->near, s->near+1, s->maxval); + if(s->T2==0 || reset_all) + s->T2= iso_clip(factor*(basic_t2-3) + 3 + 5*s->near, s->T1, s->maxval); + if(s->T3==0 || reset_all) + s->T3= iso_clip(factor*(basic_t3-4) + 4 + 7*s->near, s->T2, s->maxval); + }else{ + factor= 256 / (s->maxval + 1); + + if(s->T1==0 || reset_all) + s->T1= iso_clip(FFMAX(2, basic_t1/factor + 3*s->near), s->near+1, s->maxval); + if(s->T2==0 || reset_all) + s->T2= iso_clip(FFMAX(3, basic_t2/factor + 5*s->near), s->T1, s->maxval); + if(s->T3==0 || reset_all) + s->T3= iso_clip(FFMAX(4, basic_t3/factor + 6*s->near), s->T2, s->maxval); + } + + if(s->reset==0 || reset_all) s->reset= 64; +// av_log(NULL, AV_LOG_DEBUG, "[JPEG-LS RESET] T=%i,%i,%i\n", s->T1, s->T2, s->T3); +} + + +/********** Decoder-specific functions **********/ + +/** + * Decode LSE block with initialization parameters + */ +static int decode_lse(MJpegDecodeContext *s) +{ + int len, id; + + /* XXX: verify len field validity */ + len = get_bits(&s->gb, 16); + id = get_bits(&s->gb, 8); + + switch(id){ + case 1: + s->maxval= get_bits(&s->gb, 16); + s->t1= get_bits(&s->gb, 16); + s->t2= get_bits(&s->gb, 16); + s->t3= get_bits(&s->gb, 16); + s->reset= get_bits(&s->gb, 16); + +// reset_ls_coding_parameters(s, 0); + //FIXME quant table? + break; + case 2: + case 3: + av_log(s->avctx, AV_LOG_ERROR, "palette not supported\n"); + return -1; + case 4: + av_log(s->avctx, AV_LOG_ERROR, "oversize image not supported\n"); + return -1; + default: + av_log(s->avctx, AV_LOG_ERROR, "invalid id %d\n", id); + return -1; + } +// av_log(s->avctx, AV_LOG_DEBUG, "ID=%i, T=%i,%i,%i\n", id, s->t1, s->t2, s->t3); + + return 0; +} + +static void inline 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 update_state_regular(JLSState *state, int Q, int err){ + state->A[Q] += FFABS(err); + err *= state->twonear; + state->B[Q] += err; + + 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; +} + +/** + * Get context-dependent Golomb code, decode it and update context + */ +static inline int ls_get_code_regular(GetBitContext *gb, JLSState *state, int Q){ + int k, ret; + + for(k = 0; (state->N[Q] << k) < state->A[Q]; k++); + +#ifdef JLS_BROKEN + if(!show_bits_long(gb, 32))return -1; +#endif + ret = get_ur_golomb_jpegls(gb, k, state->limit, state->qbpp); + + /* decode mapped error */ + if(ret & 1) + ret = -((ret + 1) >> 1); + else + ret >>= 1; + + /* for NEAR=0, k=0 and 2*B[Q] <= - N[Q] mapping is reversed */ + if(!state->near && !k && (2 * state->B[Q] <= -state->N[Q])) + ret = -(ret + 1); + + ret= update_state_regular(state, Q, ret); + + return ret; +} + +/** + * Get Golomb code, decode it and update state for run termination + */ +static inline int ls_get_code_runterm(GetBitContext *gb, JLSState *state, int RItype, int limit_add){ + int k, ret, temp, map; + int Q = 365 + RItype; + + temp= state->A[Q]; + if(RItype) + temp += state->N[Q] >> 1; + + for(k = 0; (state->N[Q] << k) < temp; k++); + +#ifdef JLS_BROKEN + if(!show_bits_long(gb, 32))return -1; +#endif + ret = get_ur_golomb_jpegls(gb, k, state->limit - limit_add - 1, state->qbpp); + + /* decode mapped error */ + map = 0; + if(!k && (RItype || ret) && (2 * state->B[Q] < state->N[Q])) + map = 1; + ret += RItype + map; + + if(ret & 1){ + ret = map - ((ret + 1) >> 1); + state->B[Q]++; + } else { + ret = ret >> 1; + } + + /* update state */ + state->A[Q] += FFABS(ret) - RItype; + ret *= state->twonear; + downscale_state(state, Q); + + return ret; +} + +#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)) +/** + * Decode one line of image + */ +static inline void ls_decode_line(JLSState *state, MJpegDecodeContext *s, void *last, void *dst, int last2, int w, int stride, int comp, int bits){ + int i, x = 0; + int Ra, Rb, Rc, Rd; + int D0, D1, D2; + + while(x < w) { + int err, pred; + + /* compute gradients */ + Ra = x ? R(dst, x - stride) : R(last, x); + Rb = R(last, x); + Rc = x ? R(last, x - stride) : last2; + Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride); + D0 = Rd - Rb; + D1 = Rb - Rc; + D2 = Rc - Ra; + /* run mode */ + if((FFABS(D0) <= state->near) && (FFABS(D1) <= state->near) && (FFABS(D2) <= state->near)) { + int r; + int RItype; + + /* decode full runs while available */ + while(get_bits1(&s->gb)) { + int r; + r = 1 << log2_run[state->run_index[comp]]; + if(x + r * stride > w) { + r = (w - x) / stride; + } + for(i = 0; i < r; i++) { + W(dst, x, Ra); + x += stride; + } + /* if EOL reached, we stop decoding */ + if(r != (1 << log2_run[state->run_index[comp]])) + return; + if(state->run_index[comp] < 31) + state->run_index[comp]++; + if(x + stride > w) + return; + } + /* decode aborted run */ + r = log2_run[state->run_index[comp]]; + if(r) + r = get_bits_long(&s->gb, r); + for(i = 0; i < r; i++) { + W(dst, x, Ra); + x += stride; + } + + /* decode run termination value */ + Rb = R(last, x); + RItype = (FFABS(Ra - Rb) <= state->near) ? 1 : 0; + err = ls_get_code_runterm(&s->gb, state, RItype, log2_run[state->run_index[comp]]); + if(state->run_index[comp]) + state->run_index[comp]--; + + if(state->near && RItype){ + pred = Ra + err; + } else { + if(Rb < Ra) + pred = Rb - err; + else + pred = Rb + err; + } + } else { /* regular mode */ + int context, sign; + + 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; + }else{ + sign = 0; + } + + if(sign){ + pred = clip(pred - state->C[context], 0, state->maxval); + err = -ls_get_code_regular(&s->gb, state, context); + } else { + pred = clip(pred + state->C[context], 0, state->maxval); + err = ls_get_code_regular(&s->gb, state, context); + } + + /* we have to do something more for near-lossless coding */ + pred += err; + } + if(state->near){ + if(pred < -state->near) + pred += state->range * state->twonear; + else if(pred > state->maxval + state->near) + pred -= state->range * state->twonear; + pred = clip(pred, 0, state->maxval); + } + + pred &= state->maxval; + W(dst, x, pred); + x += stride; + } +} + +static int ls_decode_picture(MJpegDecodeContext *s, int near, int point_transform, int ilv){ + int i, t = 0; + uint8_t *zero, *last, *cur; + JLSState *state; + int off = 0, stride = 1, width, shift; + + zero = av_mallocz(s->picture.linesize[0]); + last = zero; + cur = s->picture.data[0]; + + state = av_mallocz(sizeof(JLSState)); + /* initialize JPEG-LS state from JPEG parameters */ + state->near = near; + state->bpp = (s->bits < 2) ? 2 : s->bits; + state->maxval = s->maxval; + state->T1 = s->t1; + state->T2 = s->t2; + state->T3 = s->t3; + state->reset = s->reset; + reset_ls_coding_parameters(state, 0); + ls_init_state(state); + + if(s->bits <= 8) + shift = point_transform + (8 - s->bits); + else + shift = point_transform + (16 - s->bits); + +// 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); +// 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); + if(ilv == 0) { /* separate planes */ + off = s->cur_scan - 1; + stride = (s->nb_components > 1) ? 3 : 1; + width = s->width * stride; + cur += off; + for(i = 0; i < s->height; i++) { + if(s->bits <= 8){ + ls_decode_line(state, s, last, cur, t, width, stride, off, 8); + t = last[0]; + }else{ + ls_decode_line(state, s, last, cur, t, width, stride, off, 16); + t = *((uint16_t*)last); + } + last = cur; + cur += s->picture.linesize[0]; + + if (s->restart_interval && !--s->restart_count) { + align_get_bits(&s->gb); + skip_bits(&s->gb, 16); /* skip RSTn */ + } + } + } else if(ilv == 1) { /* line interleaving */ + int j; + int Rc[3] = {0, 0, 0}; + memset(cur, 0, s->picture.linesize[0]); + width = s->width * 3; + for(i = 0; i < s->height; i++) { + for(j = 0; j < 3; j++) { + ls_decode_line(state, s, last + j, cur + j, Rc[j], width, 3, j, 8); + Rc[j] = last[j]; + + if (s->restart_interval && !--s->restart_count) { + align_get_bits(&s->gb); + skip_bits(&s->gb, 16); /* skip RSTn */ + } + } + last = cur; + cur += s->picture.linesize[0]; + } + } else if(ilv == 2) { /* sample interleaving */ + av_log(s->avctx, AV_LOG_ERROR, "Sample interleaved images are not supported.\n"); + av_free(state); + av_free(zero); + return -1; + } + + if(shift){ /* we need to do point transform or normalize samples */ + int x, w; + + w = s->width * s->nb_components; + + if(s->bits <= 8){ + uint8_t *src = s->picture.data[0]; + + for(i = 0; i < s->height; i++){ + for(x = off; x < w; x+= stride){ + src[x] <<= shift; + } + src += s->picture.linesize[0]; + } + }else{ + uint16_t *src = s->picture.data[0]; + + for(i = 0; i < s->height; i++){ + for(x = 0; x < w; x++){ + src[x] <<= shift; + } + src += s->picture.linesize[0]/2; + } + } + } + av_free(state); + av_free(zero); + + return 0; +} + +#if defined(CONFIG_ENCODERS) && defined(CONFIG_JPEGLS_ENCODER) +/********** Encoder-specific functions **********/ + +/** + * Encode error from regular symbol + */ +static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q, int err){ + int k; + int val; + int map; + + for(k = 0; (state->N[Q] << k) < state->A[Q]; k++); + + map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]); + + if(err < 0) + err += state->range; + if(err >= ((state->range + 1) >> 1)) { + err -= state->range; + val = 2 * FFABS(err) - 1 - map; + } else + val = 2 * err + map; + + set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp); + + update_state_regular(state, Q, err); +} + +/** + * 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; + + downscale_state(state, 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, void *last, void *cur, int last2, int w, int stride, int comp, int bits){ + int x = 0; + int Ra, Rb, Rc, Rd; + int D0, D1, D2; + + while(x < w) { + int err, pred, sign; + + /* compute gradients */ + Ra = x ? R(cur, x - stride) : R(last, x); + Rb = R(last, x); + Rc = x ? R(last, x - stride) : last2; + Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride); + D0 = Rd - Rb; + D1 = Rb - Rc; + D2 = Rc - Ra; + + /* run mode */ + if((FFABS(D0) <= state->near) && (FFABS(D1) <= state->near) && (FFABS(D2) <= state->near)) { + int RUNval, RItype, run; + + run = 0; + RUNval = Ra; + while(x < w && (FFABS(R(cur, x) - RUNval) <= state->near)){ + run++; + W(cur, x, Ra); + x += stride; + } + ls_encode_run(state, pb, run, comp, x < w); + if(x >= w) + return; + Rb = R(last, x); + RItype = (FFABS(Ra - Rb) <= state->near); + pred = RItype ? Ra : Rb; + err = R(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); + W(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]--; + } 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 - R(cur, x); + }else{ + sign = 0; + pred = clip(pred + state->C[context], 0, state->maxval); + err = R(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); + W(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 = state->bpp; + 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; + + if(avctx->pix_fmt == PIX_FMT_GRAY8 || avctx->pix_fmt == PIX_FMT_GRAY16) + comps = 1; + else + comps = 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, (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 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 = (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 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, 8); + t = last[0]; + last = cur; + cur += p->linesize[0]; + } + }else if(avctx->pix_fmt == PIX_FMT_GRAY16){ + int t = 0; + + for(i = 0; i < avctx->height; i++) { + ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16); + t = *((uint16_t*)last); + 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, 8); + 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, 8); + 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_GRAY16 && 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, PIX_FMT_GRAY16, -1}, +}; +#endif |