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
39 * Encode error from regular symbol
41 static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q,
48 for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
51 map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
55 if (err >= (state->range + 1 >> 1)) {
57 val = 2 * FFABS(err) - 1 - map;
61 set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
63 ff_jpegls_update_state_regular(state, Q, err);
67 * Encode error from run termination
69 static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb,
70 int RItype, int err, int limit_add)
79 temp += state->N[Q] >> 1;
80 for (k = 0; (state->N[Q] << k) < temp; k++)
83 if (!k && err && (2 * state->B[Q] < state->N[Q]))
87 val = -(2 * err) - 1 - RItype + map;
89 val = 2 * err - RItype - map;
90 set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
94 state->A[Q] += (val + 1 - RItype) >> 1;
96 ff_jpegls_downscale_state(state, Q);
100 * Encode run value as specified by JPEG-LS standard
102 static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run,
105 while (run >= (1 << ff_log2_run[state->run_index[comp]])) {
107 run -= 1 << ff_log2_run[state->run_index[comp]];
108 if (state->run_index[comp] < 31)
109 state->run_index[comp]++;
111 /* if hit EOL, encode another full run, else encode aborted run */
116 if (ff_log2_run[state->run_index[comp]])
117 put_bits(pb, ff_log2_run[state->run_index[comp]], run);
122 * Encode one line of image
124 static inline void ls_encode_line(JLSState *state, PutBitContext *pb,
125 void *last, void *cur, int last2, int w,
126 int stride, int comp, int bits)
135 /* compute gradients */
136 Ra = x ? R(cur, x - stride) : R(last, x);
138 Rc = x ? R(last, x - stride) : last2;
139 Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
145 if ((FFABS(D0) <= state->near) &&
146 (FFABS(D1) <= state->near) &&
147 (FFABS(D2) <= state->near)) {
148 int RUNval, RItype, run;
152 while (x < w && (FFABS(R(cur, x) - RUNval) <= state->near)) {
157 ls_encode_run(state, pb, run, comp, x < w);
161 RItype = FFABS(Ra - Rb) <= state->near;
162 pred = RItype ? Ra : Rb;
163 err = R(cur, x) - pred;
165 if (!RItype && Ra > Rb)
170 err = (state->near + err) / state->twonear;
172 err = -(state->near - err) / state->twonear;
174 if (RItype || (Rb >= Ra))
175 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
177 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
182 if (err >= state->range + 1 >> 1)
185 ls_encode_runterm(state, pb, RItype, err,
186 ff_log2_run[state->run_index[comp]]);
188 if (state->run_index[comp] > 0)
189 state->run_index[comp]--;
190 } else { /* regular mode */
193 context = ff_jpegls_quantize(state, D0) * 81 +
194 ff_jpegls_quantize(state, D1) * 9 +
195 ff_jpegls_quantize(state, D2);
196 pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
201 pred = av_clip(pred - state->C[context], 0, state->maxval);
202 err = pred - R(cur, x);
205 pred = av_clip(pred + state->C[context], 0, state->maxval);
206 err = R(cur, x) - pred;
211 err = (state->near + err) / state->twonear;
213 err = -(state->near - err) / state->twonear;
215 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
217 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
221 ls_encode_regular(state, pb, context, err);
227 static void ls_store_lse(JLSState *state, PutBitContext *pb)
229 /* Test if we have default params and don't need to store LSE */
230 JLSState state2 = { 0 };
231 state2.bpp = state->bpp;
232 state2.near = state->near;
233 ff_jpegls_reset_coding_parameters(&state2, 1);
234 if (state->T1 == state2.T1 &&
235 state->T2 == state2.T2 &&
236 state->T3 == state2.T3 &&
237 state->reset == state2.reset)
239 /* store LSE type 1 */
241 put_bits(pb, 16, 13);
243 put_bits(pb, 16, state->maxval);
244 put_bits(pb, 16, state->T1);
245 put_bits(pb, 16, state->T2);
246 put_bits(pb, 16, state->T3);
247 put_bits(pb, 16, state->reset);
250 static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
251 const AVFrame *pict, int *got_packet)
253 const AVFrame *const p = pict;
254 const int near = avctx->prediction_method;
255 PutBitContext pb, pb2;
257 uint8_t *buf2 = NULL;
258 uint8_t *zero = NULL;
260 uint8_t *last = NULL;
261 JLSState *state = NULL;
265 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
266 avctx->pix_fmt == AV_PIX_FMT_GRAY16)
271 if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width *avctx->height * comps * 4 +
272 FF_MIN_BUFFER_SIZE)) < 0)
275 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));
311 /* initialize JPEG-LS state from JPEG parameters */
313 state->bpp = (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8;
314 ff_jpegls_reset_coding_parameters(state, 0);
315 ff_jpegls_init_state(state);
317 ls_store_lse(state, &pb);
319 zero = last = av_mallocz(FFABS(p->linesize[0]));
324 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
327 for (i = 0; i < avctx->height; i++) {
328 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 8);
331 cur += p->linesize[0];
333 } else if (avctx->pix_fmt == AV_PIX_FMT_GRAY16) {
336 for (i = 0; i < avctx->height; i++) {
337 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
338 t = *((uint16_t *)last);
340 cur += p->linesize[0];
342 } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
344 int Rc[3] = { 0, 0, 0 };
346 width = avctx->width * 3;
347 for (i = 0; i < avctx->height; i++) {
348 for (j = 0; j < 3; j++) {
349 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
354 cur += p->linesize[0];
356 } else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
358 int Rc[3] = { 0, 0, 0 };
360 width = avctx->width * 3;
361 for (i = 0; i < avctx->height; i++) {
362 for (j = 2; j >= 0; j--) {
363 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
368 cur += p->linesize[0];
375 /* the specification says that after doing 0xff escaping unused bits in
376 * the last byte must be set to 0, so just append 7 "optional" zero-bits
377 * to avoid special-casing. */
378 put_bits(&pb2, 7, 0);
379 size = put_bits_count(&pb2);
380 flush_put_bits(&pb2);
381 /* do escape coding */
382 init_get_bits(&gb, buf2, size);
384 while (get_bits_count(&gb) < size) {
386 v = get_bits(&gb, 8);
389 v = get_bits(&gb, 7);
393 avpriv_align_put_bits(&pb);
397 put_marker(&pb, EOI);
402 pkt->size = put_bits_count(&pb) >> 3;
403 pkt->flags |= AV_PKT_FLAG_KEY;
412 return AVERROR(ENOMEM);
415 static av_cold int encode_close(AVCodecContext *avctx)
417 av_frame_free(&avctx->coded_frame);
421 static av_cold int encode_init_ls(AVCodecContext *ctx)
423 ctx->coded_frame = av_frame_alloc();
424 if (!ctx->coded_frame)
425 return AVERROR(ENOMEM);
427 ctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
428 ctx->coded_frame->key_frame = 1;
430 if (ctx->pix_fmt != AV_PIX_FMT_GRAY8 &&
431 ctx->pix_fmt != AV_PIX_FMT_GRAY16 &&
432 ctx->pix_fmt != AV_PIX_FMT_RGB24 &&
433 ctx->pix_fmt != AV_PIX_FMT_BGR24) {
434 av_log(ctx, AV_LOG_ERROR,
435 "Only grayscale and RGB24/BGR24 images are supported\n");
441 AVCodec ff_jpegls_encoder = {
443 .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
444 .type = AVMEDIA_TYPE_VIDEO,
445 .id = AV_CODEC_ID_JPEGLS,
446 .init = encode_init_ls,
447 .close = encode_close,
448 .capabilities = CODEC_CAP_FRAME_THREADS | CODEC_CAP_INTRA_ONLY,
449 .encode2 = encode_picture_ls,
450 .pix_fmts = (const enum AVPixelFormat[]) {
451 AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
452 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,
455 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
456 FF_CODEC_CAP_INIT_CLEANUP,