3 * Copyright (c) 2003 Michael Niedermayer
4 * Copyright (c) 2006 Konstantin Shishkov
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * @file libavcodec/jpeglsenc.c
38 * Encode error from regular symbol
40 static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q, int err){
45 for(k = 0; (state->N[Q] << k) < state->A[Q]; k++);
47 map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
51 if(err >= ((state->range + 1) >> 1)) {
53 val = 2 * FFABS(err) - 1 - map;
57 set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
59 ff_jpegls_update_state_regular(state, Q, err);
63 * Encode error from run termination
65 static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb, int RItype, int err, int limit_add){
73 temp += state->N[Q] >> 1;
74 for(k = 0; (state->N[Q] << k) < temp; k++);
76 if(!k && err && (2 * state->B[Q] < state->N[Q]))
80 val = - (2 * err) - 1 - RItype + map;
82 val = 2 * err - RItype - map;
83 set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
87 state->A[Q] += (val + 1 - RItype) >> 1;
89 ff_jpegls_downscale_state(state, Q);
93 * Encode run value as specified by JPEG-LS standard
95 static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run, int comp, int trail){
96 while(run >= (1 << ff_log2_run[state->run_index[comp]])){
98 run -= 1 << ff_log2_run[state->run_index[comp]];
99 if(state->run_index[comp] < 31)
100 state->run_index[comp]++;
102 /* if hit EOL, encode another full run, else encode aborted run */
107 if(ff_log2_run[state->run_index[comp]])
108 put_bits(pb, ff_log2_run[state->run_index[comp]], run);
113 * Encode one line of image
115 static inline void ls_encode_line(JLSState *state, PutBitContext *pb, void *last, void *cur, int last2, int w, int stride, int comp, int bits){
123 /* compute gradients */
124 Ra = x ? R(cur, x - stride) : R(last, x);
126 Rc = x ? R(last, x - stride) : last2;
127 Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
133 if((FFABS(D0) <= state->near) && (FFABS(D1) <= state->near) && (FFABS(D2) <= state->near)) {
134 int RUNval, RItype, run;
138 while(x < w && (FFABS(R(cur, x) - RUNval) <= state->near)){
143 ls_encode_run(state, pb, run, comp, x < w);
147 RItype = (FFABS(Ra - Rb) <= state->near);
148 pred = RItype ? Ra : Rb;
149 err = R(cur, x) - pred;
151 if(!RItype && Ra > Rb)
156 err = (state->near + err) / state->twonear;
158 err = -(state->near - err) / state->twonear;
160 if(RItype || (Rb >= Ra))
161 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
163 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
168 if(err >= ((state->range + 1) >> 1))
171 ls_encode_runterm(state, pb, RItype, err, ff_log2_run[state->run_index[comp]]);
173 if(state->run_index[comp] > 0)
174 state->run_index[comp]--;
175 } else { /* regular mode */
178 context = ff_jpegls_quantize(state, D0) * 81 + ff_jpegls_quantize(state, D1) * 9 + ff_jpegls_quantize(state, D2);
179 pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
184 pred = av_clip(pred - state->C[context], 0, state->maxval);
185 err = pred - R(cur, x);
188 pred = av_clip(pred + state->C[context], 0, state->maxval);
189 err = R(cur, x) - pred;
194 err = (state->near + err) / state->twonear;
196 err = -(state->near - err) / state->twonear;
198 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
200 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
204 ls_encode_regular(state, pb, context, err);
210 static void ls_store_lse(JLSState *state, PutBitContext *pb){
211 /* Test if we have default params and don't need to store LSE */
213 memset(&state2, 0, sizeof(JLSState));
214 state2.bpp = state->bpp;
215 state2.near = state->near;
216 ff_jpegls_reset_coding_parameters(&state2, 1);
217 if(state->T1 == state2.T1 && state->T2 == state2.T2 && state->T3 == state2.T3 && state->reset == state2.reset)
219 /* store LSE type 1 */
221 put_bits(pb, 16, 13);
223 put_bits(pb, 16, state->maxval);
224 put_bits(pb, 16, state->T1);
225 put_bits(pb, 16, state->T2);
226 put_bits(pb, 16, state->T3);
227 put_bits(pb, 16, state->reset);
230 static int encode_picture_ls(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
231 JpeglsContext * const s = avctx->priv_data;
232 AVFrame *pict = data;
233 AVFrame * const p= (AVFrame*)&s->picture;
234 const int near = avctx->prediction_method;
235 PutBitContext pb, pb2;
237 uint8_t *buf2, *zero, *cur, *last;
242 buf2 = av_malloc(buf_size);
244 init_put_bits(&pb, buf, buf_size);
245 init_put_bits(&pb2, buf2, buf_size);
248 p->pict_type= FF_I_TYPE;
251 if(avctx->pix_fmt == PIX_FMT_GRAY8 || avctx->pix_fmt == PIX_FMT_GRAY16)
256 /* write our own JPEG header, can't use mjpeg_picture_header */
257 put_marker(&pb, SOI);
258 put_marker(&pb, SOF48);
259 put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
260 put_bits(&pb, 8, (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8); // bpp
261 put_bits(&pb, 16, avctx->height);
262 put_bits(&pb, 16, avctx->width);
263 put_bits(&pb, 8, comps); // components
264 for(i = 1; i <= comps; i++) {
265 put_bits(&pb, 8, i); // component ID
266 put_bits(&pb, 8, 0x11); // subsampling: none
267 put_bits(&pb, 8, 0); // Tiq, used by JPEG-LS ext
270 put_marker(&pb, SOS);
271 put_bits(&pb, 16, 6 + comps * 2);
272 put_bits(&pb, 8, comps);
273 for(i = 1; i <= comps; i++) {
274 put_bits(&pb, 8, i); // component ID
275 put_bits(&pb, 8, 0); // mapping index: none
277 put_bits(&pb, 8, near);
278 put_bits(&pb, 8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
279 put_bits(&pb, 8, 0); // point transform: none
281 state = av_mallocz(sizeof(JLSState));
282 /* initialize JPEG-LS state from JPEG parameters */
284 state->bpp = (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8;
285 ff_jpegls_reset_coding_parameters(state, 0);
286 ff_jpegls_init_state(state);
288 ls_store_lse(state, &pb);
290 zero = av_mallocz(p->linesize[0]);
293 if(avctx->pix_fmt == PIX_FMT_GRAY8){
296 for(i = 0; i < avctx->height; i++) {
297 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 8);
300 cur += p->linesize[0];
302 }else if(avctx->pix_fmt == PIX_FMT_GRAY16){
305 for(i = 0; i < avctx->height; i++) {
306 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
307 t = *((uint16_t*)last);
309 cur += p->linesize[0];
311 }else if(avctx->pix_fmt == PIX_FMT_RGB24){
313 int Rc[3] = {0, 0, 0};
315 width = avctx->width * 3;
316 for(i = 0; i < avctx->height; i++) {
317 for(j = 0; j < 3; j++) {
318 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
322 cur += s->picture.linesize[0];
324 }else if(avctx->pix_fmt == PIX_FMT_BGR24){
326 int Rc[3] = {0, 0, 0};
328 width = avctx->width * 3;
329 for(i = 0; i < avctx->height; i++) {
330 for(j = 2; j >= 0; j--) {
331 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
335 cur += s->picture.linesize[0];
342 // the specification says that after doing 0xff escaping unused bits in the
343 // last byte must be set to 0, so just append 7 "optional" zero-bits to
344 // avoid special-casing.
345 put_bits(&pb2, 7, 0);
346 size = put_bits_count(&pb2);
347 flush_put_bits(&pb2);
348 /* do escape coding */
349 init_get_bits(&gb, buf2, size);
351 while(get_bits_count(&gb) < size){
353 v = get_bits(&gb, 8);
356 v = get_bits(&gb, 7);
364 put_marker(&pb, EOI);
369 return put_bits_count(&pb) >> 3;
372 static av_cold int encode_init_ls(AVCodecContext *ctx) {
373 JpeglsContext *c = (JpeglsContext*)ctx->priv_data;
376 ctx->coded_frame = &c->picture;
378 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){
379 av_log(ctx, AV_LOG_ERROR, "Only grayscale and RGB24/BGR24 images are supported\n");
385 AVCodec jpegls_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
389 sizeof(JpeglsContext),
393 .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB24, PIX_FMT_GRAY8, PIX_FMT_GRAY16, PIX_FMT_NONE},
394 .long_name= NULL_IF_CONFIG_SMALL("JPEG-LS"),