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
30 #include "golomb_legacy.h"
37 typedef struct JPEGLSContext {
44 * Encode error from regular symbol
46 static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q,
53 for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
56 map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
60 if (err >= (state->range + 1 >> 1)) {
62 val = 2 * FFABS(err) - 1 - map;
66 set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
68 ff_jpegls_update_state_regular(state, Q, err);
72 * Encode error from run termination
74 static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb,
75 int RItype, int err, int limit_add)
84 temp += state->N[Q] >> 1;
85 for (k = 0; (state->N[Q] << k) < temp; k++)
88 if (!k && err && (2 * state->B[Q] < state->N[Q]))
92 val = -(2 * err) - 1 - RItype + map;
94 val = 2 * err - RItype - map;
95 set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
99 state->A[Q] += (val + 1 - RItype) >> 1;
101 ff_jpegls_downscale_state(state, Q);
105 * Encode run value as specified by JPEG-LS standard
107 static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run,
110 while (run >= (1 << ff_log2_run[state->run_index[comp]])) {
112 run -= 1 << ff_log2_run[state->run_index[comp]];
113 if (state->run_index[comp] < 31)
114 state->run_index[comp]++;
116 /* if hit EOL, encode another full run, else encode aborted run */
121 if (ff_log2_run[state->run_index[comp]])
122 put_bits(pb, ff_log2_run[state->run_index[comp]], run);
127 * Encode one line of image
129 static inline void ls_encode_line(JLSState *state, PutBitContext *pb,
130 void *last, void *cur, int last2, int w,
131 int stride, int comp, int bits)
140 /* compute gradients */
141 Ra = x ? R(cur, x - stride) : R(last, x);
143 Rc = x ? R(last, x - stride) : last2;
144 Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
150 if ((FFABS(D0) <= state->near) &&
151 (FFABS(D1) <= state->near) &&
152 (FFABS(D2) <= state->near)) {
153 int RUNval, RItype, run;
157 while (x < w && (FFABS(R(cur, x) - RUNval) <= state->near)) {
162 ls_encode_run(state, pb, run, comp, x < w);
166 RItype = FFABS(Ra - Rb) <= state->near;
167 pred = RItype ? Ra : Rb;
168 err = R(cur, x) - pred;
170 if (!RItype && Ra > Rb)
175 err = (state->near + err) / state->twonear;
177 err = -(state->near - err) / state->twonear;
179 if (RItype || (Rb >= Ra))
180 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
182 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
187 if (err >= state->range + 1 >> 1)
190 ls_encode_runterm(state, pb, RItype, err,
191 ff_log2_run[state->run_index[comp]]);
193 if (state->run_index[comp] > 0)
194 state->run_index[comp]--;
195 } else { /* regular mode */
198 context = ff_jpegls_quantize(state, D0) * 81 +
199 ff_jpegls_quantize(state, D1) * 9 +
200 ff_jpegls_quantize(state, D2);
201 pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
206 pred = av_clip(pred - state->C[context], 0, state->maxval);
207 err = pred - R(cur, x);
210 pred = av_clip(pred + state->C[context], 0, state->maxval);
211 err = R(cur, x) - pred;
216 err = (state->near + err) / state->twonear;
218 err = -(state->near - err) / state->twonear;
220 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
222 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
226 ls_encode_regular(state, pb, context, err);
232 static void ls_store_lse(JLSState *state, PutBitContext *pb)
234 /* Test if we have default params and don't need to store LSE */
235 JLSState state2 = { 0 };
236 state2.bpp = state->bpp;
237 state2.near = state->near;
238 ff_jpegls_reset_coding_parameters(&state2, 1);
239 if (state->T1 == state2.T1 &&
240 state->T2 == state2.T2 &&
241 state->T3 == state2.T3 &&
242 state->reset == state2.reset)
244 /* store LSE type 1 */
246 put_bits(pb, 16, 13);
248 put_bits(pb, 16, state->maxval);
249 put_bits(pb, 16, state->T1);
250 put_bits(pb, 16, state->T2);
251 put_bits(pb, 16, state->T3);
252 put_bits(pb, 16, state->reset);
255 static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
256 const AVFrame *pict, int *got_packet)
258 JPEGLSContext *ctx = avctx->priv_data;
259 const AVFrame *const p = pict;
260 PutBitContext pb, pb2;
262 uint8_t *buf2 = NULL;
263 uint8_t *zero = NULL;
265 uint8_t *last = NULL;
270 #if FF_API_PRIVATE_OPT
271 FF_DISABLE_DEPRECATION_WARNINGS
272 if (avctx->prediction_method)
273 ctx->pred = avctx->prediction_method;
274 FF_ENABLE_DEPRECATION_WARNINGS
277 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
278 avctx->pix_fmt == AV_PIX_FMT_GRAY16)
283 if ((ret = ff_alloc_packet(pkt, avctx->width * avctx->height * comps * 4 +
284 AV_INPUT_BUFFER_MIN_SIZE)) < 0) {
285 av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
289 buf2 = av_malloc(pkt->size);
293 init_put_bits(&pb, pkt->data, pkt->size);
294 init_put_bits(&pb2, buf2, pkt->size);
296 /* write our own JPEG header, can't use mjpeg_picture_header */
297 put_marker(&pb, SOI);
298 put_marker(&pb, SOF48);
299 put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
300 put_bits(&pb, 8, (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8); // bpp
301 put_bits(&pb, 16, avctx->height);
302 put_bits(&pb, 16, avctx->width);
303 put_bits(&pb, 8, comps); // components
304 for (i = 1; i <= comps; i++) {
305 put_bits(&pb, 8, i); // component ID
306 put_bits(&pb, 8, 0x11); // subsampling: none
307 put_bits(&pb, 8, 0); // Tiq, used by JPEG-LS ext
310 put_marker(&pb, SOS);
311 put_bits(&pb, 16, 6 + comps * 2);
312 put_bits(&pb, 8, comps);
313 for (i = 1; i <= comps; i++) {
314 put_bits(&pb, 8, i); // component ID
315 put_bits(&pb, 8, 0); // mapping index: none
317 put_bits(&pb, 8, ctx->pred);
318 put_bits(&pb, 8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
319 put_bits(&pb, 8, 0); // point transform: none
321 state = av_mallocz(sizeof(JLSState));
325 /* initialize JPEG-LS state from JPEG parameters */
326 state->near = ctx->pred;
327 state->bpp = (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8;
328 ff_jpegls_reset_coding_parameters(state, 0);
329 ff_jpegls_init_state(state);
331 ls_store_lse(state, &pb);
333 zero = last = av_mallocz(p->linesize[0]);
338 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
341 for (i = 0; i < avctx->height; i++) {
342 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 8);
345 cur += p->linesize[0];
347 } else if (avctx->pix_fmt == AV_PIX_FMT_GRAY16) {
350 for (i = 0; i < avctx->height; i++) {
351 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
352 t = *((uint16_t *)last);
354 cur += p->linesize[0];
356 } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
358 int Rc[3] = { 0, 0, 0 };
360 width = avctx->width * 3;
361 for (i = 0; i < avctx->height; i++) {
362 for (j = 0; j < 3; j++) {
363 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
368 cur += p->linesize[0];
370 } else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
372 int Rc[3] = { 0, 0, 0 };
374 width = avctx->width * 3;
375 for (i = 0; i < avctx->height; i++) {
376 for (j = 2; j >= 0; j--) {
377 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
382 cur += p->linesize[0];
389 /* the specification says that after doing 0xff escaping unused bits in
390 * the last byte must be set to 0, so just append 7 "optional" zero bits
391 * to avoid special-casing. */
392 put_bits(&pb2, 7, 0);
393 size = put_bits_count(&pb2);
394 flush_put_bits(&pb2);
395 /* do escape coding */
396 init_get_bits(&gb, buf2, size);
398 while (get_bits_count(&gb) < size) {
400 v = get_bits(&gb, 8);
403 v = get_bits(&gb, 7);
407 avpriv_align_put_bits(&pb);
411 put_marker(&pb, EOI);
416 pkt->size = put_bits_count(&pb) >> 3;
417 pkt->flags |= AV_PKT_FLAG_KEY;
422 av_packet_unref(pkt);
426 return AVERROR(ENOMEM);
429 static av_cold int encode_init_ls(AVCodecContext *ctx)
431 #if FF_API_CODED_FRAME
432 FF_DISABLE_DEPRECATION_WARNINGS
433 ctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
434 ctx->coded_frame->key_frame = 1;
435 FF_ENABLE_DEPRECATION_WARNINGS
438 if (ctx->pix_fmt != AV_PIX_FMT_GRAY8 &&
439 ctx->pix_fmt != AV_PIX_FMT_GRAY16 &&
440 ctx->pix_fmt != AV_PIX_FMT_RGB24 &&
441 ctx->pix_fmt != AV_PIX_FMT_BGR24) {
442 av_log(ctx, AV_LOG_ERROR,
443 "Only grayscale and RGB24/BGR24 images are supported\n");
449 #define OFFSET(x) offsetof(JPEGLSContext, x)
450 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
451 static const AVOption options[] = {
452 { "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, VE, "pred" },
453 { "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, "pred" },
454 { "plane", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
455 { "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
460 static const AVClass jpegls_class = {
461 .class_name = "jpegls",
462 .item_name = av_default_item_name,
464 .version = LIBAVUTIL_VERSION_INT,
467 AVCodec ff_jpegls_encoder = {
469 .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
470 .type = AVMEDIA_TYPE_VIDEO,
471 .id = AV_CODEC_ID_JPEGLS,
472 .priv_data_size = sizeof(JPEGLSContext),
473 .priv_class = &jpegls_class,
474 .init = encode_init_ls,
475 .encode2 = encode_picture_ls,
476 .pix_fmts = (const enum AVPixelFormat[]) {
477 AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
478 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,
481 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
482 FF_CODEC_CAP_INIT_CLEANUP,