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
38 * Encode error from regular symbol
40 static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q,
47 for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
50 map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
54 if (err >= (state->range + 1 >> 1)) {
56 val = 2 * FFABS(err) - 1 - map;
60 set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
62 ff_jpegls_update_state_regular(state, Q, err);
66 * Encode error from run termination
68 static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb,
69 int RItype, int err, int limit_add)
78 temp += state->N[Q] >> 1;
79 for (k = 0; (state->N[Q] << k) < temp; k++)
82 if (!k && err && (2 * state->B[Q] < state->N[Q]))
86 val = -(2 * err) - 1 - RItype + map;
88 val = 2 * err - RItype - map;
89 set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
93 state->A[Q] += (val + 1 - RItype) >> 1;
95 ff_jpegls_downscale_state(state, Q);
99 * Encode run value as specified by JPEG-LS standard
101 static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run,
104 while (run >= (1 << ff_log2_run[state->run_index[comp]])) {
106 run -= 1 << ff_log2_run[state->run_index[comp]];
107 if (state->run_index[comp] < 31)
108 state->run_index[comp]++;
110 /* if hit EOL, encode another full run, else encode aborted run */
115 if (ff_log2_run[state->run_index[comp]])
116 put_bits(pb, ff_log2_run[state->run_index[comp]], run);
121 * Encode one line of image
123 static inline void ls_encode_line(JLSState *state, PutBitContext *pb,
124 void *last, void *cur, int last2, int w,
125 int stride, int comp, int bits)
134 /* compute gradients */
135 Ra = x ? R(cur, x - stride) : R(last, x);
137 Rc = x ? R(last, x - stride) : last2;
138 Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
144 if ((FFABS(D0) <= state->near) &&
145 (FFABS(D1) <= state->near) &&
146 (FFABS(D2) <= state->near)) {
147 int RUNval, RItype, run;
151 while (x < w && (FFABS(R(cur, x) - RUNval) <= state->near)) {
156 ls_encode_run(state, pb, run, comp, x < w);
160 RItype = FFABS(Ra - Rb) <= state->near;
161 pred = RItype ? Ra : Rb;
162 err = R(cur, x) - pred;
164 if (!RItype && Ra > Rb)
169 err = (state->near + err) / state->twonear;
171 err = -(state->near - err) / state->twonear;
173 if (RItype || (Rb >= Ra))
174 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
176 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
181 if (err >= state->range + 1 >> 1)
184 ls_encode_runterm(state, pb, RItype, err,
185 ff_log2_run[state->run_index[comp]]);
187 if (state->run_index[comp] > 0)
188 state->run_index[comp]--;
189 } else { /* regular mode */
192 context = ff_jpegls_quantize(state, D0) * 81 +
193 ff_jpegls_quantize(state, D1) * 9 +
194 ff_jpegls_quantize(state, D2);
195 pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
200 pred = av_clip(pred - state->C[context], 0, state->maxval);
201 err = pred - R(cur, x);
204 pred = av_clip(pred + state->C[context], 0, state->maxval);
205 err = R(cur, x) - pred;
210 err = (state->near + err) / state->twonear;
212 err = -(state->near - err) / state->twonear;
214 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
216 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
220 ls_encode_regular(state, pb, context, err);
226 static void ls_store_lse(JLSState *state, PutBitContext *pb)
228 /* Test if we have default params and don't need to store LSE */
229 JLSState state2 = { 0 };
230 state2.bpp = state->bpp;
231 state2.near = state->near;
232 ff_jpegls_reset_coding_parameters(&state2, 1);
233 if (state->T1 == state2.T1 &&
234 state->T2 == state2.T2 &&
235 state->T3 == state2.T3 &&
236 state->reset == state2.reset)
238 /* store LSE type 1 */
240 put_bits(pb, 16, 13);
242 put_bits(pb, 16, state->maxval);
243 put_bits(pb, 16, state->T1);
244 put_bits(pb, 16, state->T2);
245 put_bits(pb, 16, state->T3);
246 put_bits(pb, 16, state->reset);
249 static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
250 const AVFrame *pict, int *got_packet)
252 JpeglsContext *const s = avctx->priv_data;
253 AVFrame *const p = &s->picture;
254 const int near = avctx->prediction_method;
255 PutBitContext pb, pb2;
257 uint8_t *buf2, *zero, *cur, *last;
263 p->pict_type = AV_PICTURE_TYPE_I;
266 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
267 avctx->pix_fmt == AV_PIX_FMT_GRAY16)
272 if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width *avctx->height * comps * 4 +
273 FF_MIN_BUFFER_SIZE)) < 0)
276 buf2 = av_malloc(pkt->size);
278 init_put_bits(&pb, pkt->data, pkt->size);
279 init_put_bits(&pb2, buf2, pkt->size);
281 /* write our own JPEG header, can't use mjpeg_picture_header */
282 put_marker(&pb, SOI);
283 put_marker(&pb, SOF48);
284 put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
285 put_bits(&pb, 8, (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8); // bpp
286 put_bits(&pb, 16, avctx->height);
287 put_bits(&pb, 16, avctx->width);
288 put_bits(&pb, 8, comps); // components
289 for (i = 1; i <= comps; i++) {
290 put_bits(&pb, 8, i); // component ID
291 put_bits(&pb, 8, 0x11); // subsampling: none
292 put_bits(&pb, 8, 0); // Tiq, used by JPEG-LS ext
295 put_marker(&pb, SOS);
296 put_bits(&pb, 16, 6 + comps * 2);
297 put_bits(&pb, 8, comps);
298 for (i = 1; i <= comps; i++) {
299 put_bits(&pb, 8, i); // component ID
300 put_bits(&pb, 8, 0); // mapping index: none
302 put_bits(&pb, 8, near);
303 put_bits(&pb, 8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
304 put_bits(&pb, 8, 0); // point transform: none
306 state = av_mallocz(sizeof(JLSState));
307 /* initialize JPEG-LS state from JPEG parameters */
309 state->bpp = (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8;
310 ff_jpegls_reset_coding_parameters(state, 0);
311 ff_jpegls_init_state(state);
313 ls_store_lse(state, &pb);
315 zero = av_mallocz(FFABS(p->linesize[0]));
318 return AVERROR(ENOMEM);
322 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
325 for (i = 0; i < avctx->height; i++) {
326 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 8);
329 cur += p->linesize[0];
331 } else if (avctx->pix_fmt == AV_PIX_FMT_GRAY16) {
334 for (i = 0; i < avctx->height; i++) {
335 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
336 t = *((uint16_t *)last);
338 cur += p->linesize[0];
340 } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
342 int Rc[3] = { 0, 0, 0 };
344 width = avctx->width * 3;
345 for (i = 0; i < avctx->height; i++) {
346 for (j = 0; j < 3; j++) {
347 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
352 cur += s->picture.linesize[0];
354 } else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
356 int Rc[3] = { 0, 0, 0 };
358 width = avctx->width * 3;
359 for (i = 0; i < avctx->height; i++) {
360 for (j = 2; j >= 0; j--) {
361 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
366 cur += s->picture.linesize[0];
373 /* the specification says that after doing 0xff escaping unused bits in
374 * the last byte must be set to 0, so just append 7 "optional" zero-bits
375 * to avoid special-casing. */
376 put_bits(&pb2, 7, 0);
377 size = put_bits_count(&pb2);
378 flush_put_bits(&pb2);
379 /* do escape coding */
380 init_get_bits(&gb, buf2, size);
382 while (get_bits_count(&gb) < size) {
384 v = get_bits(&gb, 8);
387 v = get_bits(&gb, 7);
391 avpriv_align_put_bits(&pb);
395 put_marker(&pb, EOI);
400 pkt->size = put_bits_count(&pb) >> 3;
401 pkt->flags |= AV_PKT_FLAG_KEY;
406 static av_cold int encode_init_ls(AVCodecContext *ctx)
408 JpeglsContext *c = (JpeglsContext *)ctx->priv_data;
411 ctx->coded_frame = &c->picture;
413 if (ctx->pix_fmt != AV_PIX_FMT_GRAY8 &&
414 ctx->pix_fmt != AV_PIX_FMT_GRAY16 &&
415 ctx->pix_fmt != AV_PIX_FMT_RGB24 &&
416 ctx->pix_fmt != AV_PIX_FMT_BGR24) {
417 av_log(ctx, AV_LOG_ERROR,
418 "Only grayscale and RGB24/BGR24 images are supported\n");
424 AVCodec ff_jpegls_encoder = {
426 .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
427 .type = AVMEDIA_TYPE_VIDEO,
428 .id = AV_CODEC_ID_JPEGLS,
429 .priv_data_size = sizeof(JpeglsContext),
430 .init = encode_init_ls,
431 .encode2 = encode_picture_ls,
432 .pix_fmts = (const enum AVPixelFormat[]) {
433 AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
434 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,