3 * Copyright (c) 2003 Michael Niedermayer
4 * Copyright (c) 2006 Konstantin Shishkov
6 * This file is part of Libav.
8 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
37 * Encode error from regular symbol
39 static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q,
46 for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
49 map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
53 if (err >= (state->range + 1 >> 1)) {
55 val = 2 * FFABS(err) - 1 - map;
59 set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
61 ff_jpegls_update_state_regular(state, Q, err);
65 * Encode error from run termination
67 static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb,
68 int RItype, int err, int limit_add)
77 temp += state->N[Q] >> 1;
78 for (k = 0; (state->N[Q] << k) < temp; k++)
81 if (!k && err && (2 * state->B[Q] < state->N[Q]))
85 val = -(2 * err) - 1 - RItype + map;
87 val = 2 * err - RItype - map;
88 set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
92 state->A[Q] += (val + 1 - RItype) >> 1;
94 ff_jpegls_downscale_state(state, Q);
98 * Encode run value as specified by JPEG-LS standard
100 static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run,
103 while (run >= (1 << ff_log2_run[state->run_index[comp]])) {
105 run -= 1 << ff_log2_run[state->run_index[comp]];
106 if (state->run_index[comp] < 31)
107 state->run_index[comp]++;
109 /* if hit EOL, encode another full run, else encode aborted run */
114 if (ff_log2_run[state->run_index[comp]])
115 put_bits(pb, ff_log2_run[state->run_index[comp]], run);
120 * Encode one line of image
122 static inline void ls_encode_line(JLSState *state, PutBitContext *pb,
123 void *last, void *cur, int last2, int w,
124 int stride, int comp, int bits)
133 /* compute gradients */
134 Ra = x ? R(cur, x - stride) : R(last, x);
136 Rc = x ? R(last, x - stride) : last2;
137 Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
143 if ((FFABS(D0) <= state->near) &&
144 (FFABS(D1) <= state->near) &&
145 (FFABS(D2) <= state->near)) {
146 int RUNval, RItype, run;
150 while (x < w && (FFABS(R(cur, x) - RUNval) <= state->near)) {
155 ls_encode_run(state, pb, run, comp, x < w);
159 RItype = FFABS(Ra - Rb) <= state->near;
160 pred = RItype ? Ra : Rb;
161 err = R(cur, x) - pred;
163 if (!RItype && Ra > Rb)
168 err = (state->near + err) / state->twonear;
170 err = -(state->near - err) / state->twonear;
172 if (RItype || (Rb >= Ra))
173 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
175 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
180 if (err >= state->range + 1 >> 1)
183 ls_encode_runterm(state, pb, RItype, err,
184 ff_log2_run[state->run_index[comp]]);
186 if (state->run_index[comp] > 0)
187 state->run_index[comp]--;
188 } else { /* regular mode */
191 context = ff_jpegls_quantize(state, D0) * 81 +
192 ff_jpegls_quantize(state, D1) * 9 +
193 ff_jpegls_quantize(state, D2);
194 pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
199 pred = av_clip(pred - state->C[context], 0, state->maxval);
200 err = pred - R(cur, x);
203 pred = av_clip(pred + state->C[context], 0, state->maxval);
204 err = R(cur, x) - pred;
209 err = (state->near + err) / state->twonear;
211 err = -(state->near - err) / state->twonear;
213 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
215 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
219 ls_encode_regular(state, pb, context, err);
225 static void ls_store_lse(JLSState *state, PutBitContext *pb)
227 /* Test if we have default params and don't need to store LSE */
228 JLSState state2 = { 0 };
229 state2.bpp = state->bpp;
230 state2.near = state->near;
231 ff_jpegls_reset_coding_parameters(&state2, 1);
232 if (state->T1 == state2.T1 &&
233 state->T2 == state2.T2 &&
234 state->T3 == state2.T3 &&
235 state->reset == state2.reset)
237 /* store LSE type 1 */
239 put_bits(pb, 16, 13);
241 put_bits(pb, 16, state->maxval);
242 put_bits(pb, 16, state->T1);
243 put_bits(pb, 16, state->T2);
244 put_bits(pb, 16, state->T3);
245 put_bits(pb, 16, state->reset);
248 static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
249 const AVFrame *pict, int *got_packet)
251 JpeglsContext *const s = avctx->priv_data;
252 AVFrame *const p = &s->picture;
253 const int near = avctx->prediction_method;
254 PutBitContext pb, pb2;
256 uint8_t *buf2, *zero, *cur, *last;
262 p->pict_type = AV_PICTURE_TYPE_I;
265 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
266 avctx->pix_fmt == AV_PIX_FMT_GRAY16)
271 if ((ret = ff_alloc_packet(pkt, avctx->width * avctx->height * comps * 4 +
272 FF_MIN_BUFFER_SIZE)) < 0) {
273 av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
277 buf2 = av_malloc(pkt->size);
279 init_put_bits(&pb, pkt->data, pkt->size);
280 init_put_bits(&pb2, buf2, pkt->size);
282 /* write our own JPEG header, can't use mjpeg_picture_header */
283 put_marker(&pb, SOI);
284 put_marker(&pb, SOF48);
285 put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
286 put_bits(&pb, 8, (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8); // bpp
287 put_bits(&pb, 16, avctx->height);
288 put_bits(&pb, 16, avctx->width);
289 put_bits(&pb, 8, comps); // components
290 for (i = 1; i <= comps; i++) {
291 put_bits(&pb, 8, i); // component ID
292 put_bits(&pb, 8, 0x11); // subsampling: none
293 put_bits(&pb, 8, 0); // Tiq, used by JPEG-LS ext
296 put_marker(&pb, SOS);
297 put_bits(&pb, 16, 6 + comps * 2);
298 put_bits(&pb, 8, comps);
299 for (i = 1; i <= comps; i++) {
300 put_bits(&pb, 8, i); // component ID
301 put_bits(&pb, 8, 0); // mapping index: none
303 put_bits(&pb, 8, near);
304 put_bits(&pb, 8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
305 put_bits(&pb, 8, 0); // point transform: none
307 state = av_mallocz(sizeof(JLSState));
308 /* initialize JPEG-LS state from JPEG parameters */
310 state->bpp = (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8;
311 ff_jpegls_reset_coding_parameters(state, 0);
312 ff_jpegls_init_state(state);
314 ls_store_lse(state, &pb);
316 zero = av_mallocz(p->linesize[0]);
319 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
322 for (i = 0; i < avctx->height; i++) {
323 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 8);
326 cur += p->linesize[0];
328 } else if (avctx->pix_fmt == AV_PIX_FMT_GRAY16) {
331 for (i = 0; i < avctx->height; i++) {
332 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
333 t = *((uint16_t *)last);
335 cur += p->linesize[0];
337 } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
339 int Rc[3] = { 0, 0, 0 };
341 width = avctx->width * 3;
342 for (i = 0; i < avctx->height; i++) {
343 for (j = 0; j < 3; j++) {
344 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
349 cur += s->picture.linesize[0];
351 } else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
353 int Rc[3] = { 0, 0, 0 };
355 width = avctx->width * 3;
356 for (i = 0; i < avctx->height; i++) {
357 for (j = 2; j >= 0; j--) {
358 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
363 cur += s->picture.linesize[0];
370 /* the specification says that after doing 0xff escaping unused bits in
371 * the last byte must be set to 0, so just append 7 "optional" zero-bits
372 * to avoid special-casing. */
373 put_bits(&pb2, 7, 0);
374 size = put_bits_count(&pb2);
375 flush_put_bits(&pb2);
376 /* do escape coding */
377 init_get_bits(&gb, buf2, size);
379 while (get_bits_count(&gb) < size) {
381 v = get_bits(&gb, 8);
384 v = get_bits(&gb, 7);
388 avpriv_align_put_bits(&pb);
392 put_marker(&pb, EOI);
397 pkt->size = put_bits_count(&pb) >> 3;
398 pkt->flags |= AV_PKT_FLAG_KEY;
403 static av_cold int encode_init_ls(AVCodecContext *ctx)
405 JpeglsContext *c = (JpeglsContext *)ctx->priv_data;
408 ctx->coded_frame = &c->picture;
410 if (ctx->pix_fmt != AV_PIX_FMT_GRAY8 &&
411 ctx->pix_fmt != AV_PIX_FMT_GRAY16 &&
412 ctx->pix_fmt != AV_PIX_FMT_RGB24 &&
413 ctx->pix_fmt != AV_PIX_FMT_BGR24) {
414 av_log(ctx, AV_LOG_ERROR,
415 "Only grayscale and RGB24/BGR24 images are supported\n");
421 AVCodec ff_jpegls_encoder = {
423 .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
424 .type = AVMEDIA_TYPE_VIDEO,
425 .id = AV_CODEC_ID_JPEGLS,
426 .priv_data_size = sizeof(JpeglsContext),
427 .init = encode_init_ls,
428 .encode2 = encode_picture_ls,
429 .pix_fmts = (const enum AVPixelFormat[]) {
430 AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
431 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,