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
29 #include "bytestream.h"
39 typedef struct JPEGLSContext {
45 static inline void put_marker_byteu(PutByteContext *pb, enum JpegMarker code)
47 bytestream2_put_byteu(pb, 0xff);
48 bytestream2_put_byteu(pb, code);
51 static inline void put_marker_byte(PutByteContext *pb, enum JpegMarker code)
53 bytestream2_put_byte(pb, 0xff);
54 bytestream2_put_byte(pb, code);
58 * Encode error from regular symbol
60 static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q,
67 for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
70 map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
74 if (err >= (state->range + 1 >> 1)) {
76 val = 2 * FFABS(err) - 1 - map;
80 set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
82 ff_jpegls_update_state_regular(state, Q, err);
86 * Encode error from run termination
88 static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb,
89 int RItype, int err, int limit_add)
98 temp += state->N[Q] >> 1;
99 for (k = 0; (state->N[Q] << k) < temp; k++)
102 if (!k && err && (2 * state->B[Q] < state->N[Q]))
106 val = -(2 * err) - 1 - RItype + map;
108 val = 2 * err - RItype - map;
109 set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
113 state->A[Q] += (val + 1 - RItype) >> 1;
115 ff_jpegls_downscale_state(state, Q);
119 * Encode run value as specified by JPEG-LS standard
121 static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run,
124 while (run >= (1 << ff_log2_run[state->run_index[comp]])) {
126 run -= 1 << ff_log2_run[state->run_index[comp]];
127 if (state->run_index[comp] < 31)
128 state->run_index[comp]++;
130 /* if hit EOL, encode another full run, else encode aborted run */
135 if (ff_log2_run[state->run_index[comp]])
136 put_bits(pb, ff_log2_run[state->run_index[comp]], run);
141 * Encode one line of image
143 static inline void ls_encode_line(JLSState *state, PutBitContext *pb,
144 void *last, void *cur, int last2, int w,
145 int stride, int comp, int bits)
154 /* compute gradients */
155 Ra = x ? R(cur, x - stride) : R(last, x);
157 Rc = x ? R(last, x - stride) : last2;
158 Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
164 if ((FFABS(D0) <= state->near) &&
165 (FFABS(D1) <= state->near) &&
166 (FFABS(D2) <= state->near)) {
167 int RUNval, RItype, run;
171 while (x < w && (FFABS(R(cur, x) - RUNval) <= state->near)) {
176 ls_encode_run(state, pb, run, comp, x < w);
180 RItype = FFABS(Ra - Rb) <= state->near;
181 pred = RItype ? Ra : Rb;
182 err = R(cur, x) - pred;
184 if (!RItype && Ra > Rb)
189 err = (state->near + err) / state->twonear;
191 err = -(state->near - err) / state->twonear;
193 if (RItype || (Rb >= Ra))
194 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
196 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
201 if (err >= state->range + 1 >> 1)
204 ls_encode_runterm(state, pb, RItype, err,
205 ff_log2_run[state->run_index[comp]]);
207 if (state->run_index[comp] > 0)
208 state->run_index[comp]--;
209 } else { /* regular mode */
212 context = ff_jpegls_quantize(state, D0) * 81 +
213 ff_jpegls_quantize(state, D1) * 9 +
214 ff_jpegls_quantize(state, D2);
215 pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
220 pred = av_clip(pred - state->C[context], 0, state->maxval);
221 err = pred - R(cur, x);
224 pred = av_clip(pred + state->C[context], 0, state->maxval);
225 err = R(cur, x) - pred;
230 err = (state->near + err) / state->twonear;
232 err = -(state->near - err) / state->twonear;
234 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
236 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
240 ls_encode_regular(state, pb, context, err);
246 static void ls_store_lse(JLSState *state, PutByteContext *pb)
248 /* Test if we have default params and don't need to store LSE */
249 JLSState state2 = { 0 };
250 state2.bpp = state->bpp;
251 state2.near = state->near;
252 ff_jpegls_reset_coding_parameters(&state2, 1);
253 if (state->T1 == state2.T1 &&
254 state->T2 == state2.T2 &&
255 state->T3 == state2.T3 &&
256 state->reset == state2.reset)
258 /* store LSE type 1 */
259 put_marker_byteu(pb, LSE);
260 bytestream2_put_be16u(pb, 13);
261 bytestream2_put_byteu(pb, 1);
262 bytestream2_put_be16u(pb, state->maxval);
263 bytestream2_put_be16u(pb, state->T1);
264 bytestream2_put_be16u(pb, state->T2);
265 bytestream2_put_be16u(pb, state->T3);
266 bytestream2_put_be16u(pb, state->reset);
269 static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
270 const AVFrame *pict, int *got_packet)
272 JPEGLSContext *ctx = avctx->priv_data;
273 const AVFrame *const p = pict;
277 uint8_t *buf2 = NULL;
278 uint8_t *zero = NULL;
280 uint8_t *last = NULL;
281 JLSState *state = NULL;
285 #if FF_API_PRIVATE_OPT
286 FF_DISABLE_DEPRECATION_WARNINGS
287 if (avctx->prediction_method)
288 ctx->pred = avctx->prediction_method;
289 FF_ENABLE_DEPRECATION_WARNINGS
292 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
293 avctx->pix_fmt == AV_PIX_FMT_GRAY16)
298 if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width *avctx->height * comps * 4 +
299 AV_INPUT_BUFFER_MIN_SIZE, 0)) < 0)
302 buf2 = av_malloc(pkt->size);
306 bytestream2_init_writer(&pb, pkt->data, pkt->size);
307 init_put_bits(&pb2, buf2, pkt->size);
309 /* write our own JPEG header, can't use mjpeg_picture_header */
310 put_marker_byteu(&pb, SOI);
311 put_marker_byteu(&pb, SOF48);
312 bytestream2_put_be16u(&pb, 8 + comps * 3); // header size depends on components
313 bytestream2_put_byteu(&pb, (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8); // bpp
314 bytestream2_put_be16u(&pb, avctx->height);
315 bytestream2_put_be16u(&pb, avctx->width);
316 bytestream2_put_byteu(&pb, comps); // components
317 for (i = 1; i <= comps; i++) {
318 bytestream2_put_byteu(&pb, i); // component ID
319 bytestream2_put_byteu(&pb, 0x11); // subsampling: none
320 bytestream2_put_byteu(&pb, 0); // Tiq, used by JPEG-LS ext
323 put_marker_byteu(&pb, SOS);
324 bytestream2_put_be16u(&pb, 6 + comps * 2);
325 bytestream2_put_byteu(&pb, comps);
326 for (i = 1; i <= comps; i++) {
327 bytestream2_put_byteu(&pb, i); // component ID
328 bytestream2_put_byteu(&pb, 0); // mapping index: none
330 bytestream2_put_byteu(&pb, ctx->pred);
331 bytestream2_put_byteu(&pb, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
332 bytestream2_put_byteu(&pb, 0); // point transform: none
334 state = av_mallocz(sizeof(JLSState));
338 /* initialize JPEG-LS state from JPEG parameters */
339 state->near = ctx->pred;
340 state->bpp = (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8;
341 ff_jpegls_reset_coding_parameters(state, 0);
342 ff_jpegls_init_state(state);
344 ls_store_lse(state, &pb);
346 zero = last = av_mallocz(FFABS(p->linesize[0]));
351 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
354 for (i = 0; i < avctx->height; i++) {
355 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 8);
358 cur += p->linesize[0];
360 } else if (avctx->pix_fmt == AV_PIX_FMT_GRAY16) {
363 for (i = 0; i < avctx->height; i++) {
364 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
365 t = *((uint16_t *)last);
367 cur += p->linesize[0];
369 } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
371 int Rc[3] = { 0, 0, 0 };
373 width = avctx->width * 3;
374 for (i = 0; i < avctx->height; i++) {
375 for (j = 0; j < 3; j++) {
376 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
381 cur += p->linesize[0];
383 } else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
385 int Rc[3] = { 0, 0, 0 };
387 width = avctx->width * 3;
388 for (i = 0; i < avctx->height; i++) {
389 for (j = 2; j >= 0; j--) {
390 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
395 cur += p->linesize[0];
402 /* the specification says that after doing 0xff escaping unused bits in
403 * the last byte must be set to 0, so just append 7 "optional" zero bits
404 * to avoid special-casing. */
405 put_bits(&pb2, 7, 0);
406 size = put_bits_count(&pb2);
407 flush_put_bits(&pb2);
408 /* do escape coding */
409 init_get_bits(&gb, buf2, size);
411 while (get_bits_count(&gb) < size) {
413 v = get_bits(&gb, 8);
414 bytestream2_put_byte(&pb, v);
416 v = get_bits(&gb, 7);
417 bytestream2_put_byte(&pb, v);
423 put_marker_byte(&pb, EOI);
427 pkt->size = bytestream2_tell_p(&pb);
428 pkt->flags |= AV_PKT_FLAG_KEY;
436 return AVERROR(ENOMEM);
439 static av_cold int encode_init_ls(AVCodecContext *ctx)
441 #if FF_API_CODED_FRAME
442 FF_DISABLE_DEPRECATION_WARNINGS
443 ctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
444 ctx->coded_frame->key_frame = 1;
445 FF_ENABLE_DEPRECATION_WARNINGS
448 if (ctx->pix_fmt != AV_PIX_FMT_GRAY8 &&
449 ctx->pix_fmt != AV_PIX_FMT_GRAY16 &&
450 ctx->pix_fmt != AV_PIX_FMT_RGB24 &&
451 ctx->pix_fmt != AV_PIX_FMT_BGR24) {
452 av_log(ctx, AV_LOG_ERROR,
453 "Only grayscale and RGB24/BGR24 images are supported\n");
459 #define OFFSET(x) offsetof(JPEGLSContext, x)
460 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
461 static const AVOption options[] = {
462 { "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, VE, "pred" },
463 { "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, "pred" },
464 { "plane", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
465 { "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
470 static const AVClass jpegls_class = {
471 .class_name = "jpegls",
472 .item_name = av_default_item_name,
474 .version = LIBAVUTIL_VERSION_INT,
477 AVCodec ff_jpegls_encoder = {
479 .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
480 .type = AVMEDIA_TYPE_VIDEO,
481 .id = AV_CODEC_ID_JPEGLS,
482 .priv_data_size = sizeof(JPEGLSContext),
483 .priv_class = &jpegls_class,
484 .init = encode_init_ls,
485 .capabilities = AV_CODEC_CAP_FRAME_THREADS,
486 .encode2 = encode_picture_ls,
487 .pix_fmts = (const enum AVPixelFormat[]) {
488 AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
489 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,
492 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
493 FF_CODEC_CAP_INIT_CLEANUP,