Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / jpeglsenc.c
1 /*
2 * JPEG-LS encoder
3 * Copyright (c) 2003 Michael Niedermayer
4 * Copyright (c) 2006 Konstantin Shishkov
5 *
6 * This file is part of FFmpeg.
7 *
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.
12 *
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.
17 *
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
21 */
22
23 /**
24 * @file
25 * JPEG-LS encoder.
26 */
27
28 #include "avcodec.h"
29 #include "get_bits.h"
30 #include "put_bits.h"
31 #include "golomb.h"
32 #include "internal.h"
33 #include "mathops.h"
34 #include "mjpeg.h"
35 #include "jpegls.h"
36
37 /**
38 * Encode error from regular symbol
39 */
40 static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q,
41 int err)
42 {
43 int k;
44 int val;
45 int map;
46
47 for (k = 0; (state->N[Q] << k) < state->A[Q]; k++)
48 ;
49
50 map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
51
52 if (err < 0)
53 err += state->range;
54 if (err >= (state->range + 1 >> 1)) {
55 err -= state->range;
56 val = 2 * FFABS(err) - 1 - map;
57 } else
58 val = 2 * err + map;
59
60 set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
61
62 ff_jpegls_update_state_regular(state, Q, err);
63 }
64
65 /**
66 * Encode error from run termination
67 */
68 static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb,
69 int RItype, int err, int limit_add)
70 {
71 int k;
72 int val, map;
73 int Q = 365 + RItype;
74 int temp;
75
76 temp = state->A[Q];
77 if (RItype)
78 temp += state->N[Q] >> 1;
79 for (k = 0; (state->N[Q] << k) < temp; k++)
80 ;
81 map = 0;
82 if (!k && err && (2 * state->B[Q] < state->N[Q]))
83 map = 1;
84
85 if (err < 0)
86 val = -(2 * err) - 1 - RItype + map;
87 else
88 val = 2 * err - RItype - map;
89 set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
90
91 if (err < 0)
92 state->B[Q]++;
93 state->A[Q] += (val + 1 - RItype) >> 1;
94
95 ff_jpegls_downscale_state(state, Q);
96 }
97
98 /**
99 * Encode run value as specified by JPEG-LS standard
100 */
101 static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run,
102 int comp, int trail)
103 {
104 while (run >= (1 << ff_log2_run[state->run_index[comp]])) {
105 put_bits(pb, 1, 1);
106 run -= 1 << ff_log2_run[state->run_index[comp]];
107 if (state->run_index[comp] < 31)
108 state->run_index[comp]++;
109 }
110 /* if hit EOL, encode another full run, else encode aborted run */
111 if (!trail && run) {
112 put_bits(pb, 1, 1);
113 } else if (trail) {
114 put_bits(pb, 1, 0);
115 if (ff_log2_run[state->run_index[comp]])
116 put_bits(pb, ff_log2_run[state->run_index[comp]], run);
117 }
118 }
119
120 /**
121 * Encode one line of image
122 */
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)
126 {
127 int x = 0;
128 int Ra, Rb, Rc, Rd;
129 int D0, D1, D2;
130
131 while (x < w) {
132 int err, pred, sign;
133
134 /* compute gradients */
135 Ra = x ? R(cur, x - stride) : R(last, x);
136 Rb = R(last, x);
137 Rc = x ? R(last, x - stride) : last2;
138 Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
139 D0 = Rd - Rb;
140 D1 = Rb - Rc;
141 D2 = Rc - Ra;
142
143 /* run mode */
144 if ((FFABS(D0) <= state->near) &&
145 (FFABS(D1) <= state->near) &&
146 (FFABS(D2) <= state->near)) {
147 int RUNval, RItype, run;
148
149 run = 0;
150 RUNval = Ra;
151 while (x < w && (FFABS(R(cur, x) - RUNval) <= state->near)) {
152 run++;
153 W(cur, x, Ra);
154 x += stride;
155 }
156 ls_encode_run(state, pb, run, comp, x < w);
157 if (x >= w)
158 return;
159 Rb = R(last, x);
160 RItype = FFABS(Ra - Rb) <= state->near;
161 pred = RItype ? Ra : Rb;
162 err = R(cur, x) - pred;
163
164 if (!RItype && Ra > Rb)
165 err = -err;
166
167 if (state->near) {
168 if (err > 0)
169 err = (state->near + err) / state->twonear;
170 else
171 err = -(state->near - err) / state->twonear;
172
173 if (RItype || (Rb >= Ra))
174 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
175 else
176 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
177 W(cur, x, Ra);
178 }
179 if (err < 0)
180 err += state->range;
181 if (err >= state->range + 1 >> 1)
182 err -= state->range;
183
184 ls_encode_runterm(state, pb, RItype, err,
185 ff_log2_run[state->run_index[comp]]);
186
187 if (state->run_index[comp] > 0)
188 state->run_index[comp]--;
189 } else { /* regular mode */
190 int context;
191
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);
196
197 if (context < 0) {
198 context = -context;
199 sign = 1;
200 pred = av_clip(pred - state->C[context], 0, state->maxval);
201 err = pred - R(cur, x);
202 } else {
203 sign = 0;
204 pred = av_clip(pred + state->C[context], 0, state->maxval);
205 err = R(cur, x) - pred;
206 }
207
208 if (state->near) {
209 if (err > 0)
210 err = (state->near + err) / state->twonear;
211 else
212 err = -(state->near - err) / state->twonear;
213 if (!sign)
214 Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
215 else
216 Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
217 W(cur, x, Ra);
218 }
219
220 ls_encode_regular(state, pb, context, err);
221 }
222 x += stride;
223 }
224 }
225
226 static void ls_store_lse(JLSState *state, PutBitContext *pb)
227 {
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)
237 return;
238 /* store LSE type 1 */
239 put_marker(pb, LSE);
240 put_bits(pb, 16, 13);
241 put_bits(pb, 8, 1);
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);
247 }
248
249 static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
250 const AVFrame *pict, int *got_packet)
251 {
252 const AVFrame *const p = pict;
253 const int near = avctx->prediction_method;
254 PutBitContext pb, pb2;
255 GetBitContext gb;
256 uint8_t *buf2, *zero, *cur, *last;
257 JLSState *state;
258 int i, size, ret;
259 int comps;
260
261 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
262 avctx->pix_fmt == AV_PIX_FMT_GRAY16)
263 comps = 1;
264 else
265 comps = 3;
266
267 if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width *avctx->height * comps * 4 +
268 FF_MIN_BUFFER_SIZE)) < 0)
269 return ret;
270
271 buf2 = av_malloc(pkt->size);
272
273 init_put_bits(&pb, pkt->data, pkt->size);
274 init_put_bits(&pb2, buf2, pkt->size);
275
276 /* write our own JPEG header, can't use mjpeg_picture_header */
277 put_marker(&pb, SOI);
278 put_marker(&pb, SOF48);
279 put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
280 put_bits(&pb, 8, (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8); // bpp
281 put_bits(&pb, 16, avctx->height);
282 put_bits(&pb, 16, avctx->width);
283 put_bits(&pb, 8, comps); // components
284 for (i = 1; i <= comps; i++) {
285 put_bits(&pb, 8, i); // component ID
286 put_bits(&pb, 8, 0x11); // subsampling: none
287 put_bits(&pb, 8, 0); // Tiq, used by JPEG-LS ext
288 }
289
290 put_marker(&pb, SOS);
291 put_bits(&pb, 16, 6 + comps * 2);
292 put_bits(&pb, 8, comps);
293 for (i = 1; i <= comps; i++) {
294 put_bits(&pb, 8, i); // component ID
295 put_bits(&pb, 8, 0); // mapping index: none
296 }
297 put_bits(&pb, 8, near);
298 put_bits(&pb, 8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
299 put_bits(&pb, 8, 0); // point transform: none
300
301 state = av_mallocz(sizeof(JLSState));
302 /* initialize JPEG-LS state from JPEG parameters */
303 state->near = near;
304 state->bpp = (avctx->pix_fmt == AV_PIX_FMT_GRAY16) ? 16 : 8;
305 ff_jpegls_reset_coding_parameters(state, 0);
306 ff_jpegls_init_state(state);
307
308 ls_store_lse(state, &pb);
309
310 zero = av_mallocz(FFABS(p->linesize[0]));
311 if (!zero) {
312 av_free(state);
313 return AVERROR(ENOMEM);
314 }
315 last = zero;
316 cur = p->data[0];
317 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
318 int t = 0;
319
320 for (i = 0; i < avctx->height; i++) {
321 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 8);
322 t = last[0];
323 last = cur;
324 cur += p->linesize[0];
325 }
326 } else if (avctx->pix_fmt == AV_PIX_FMT_GRAY16) {
327 int t = 0;
328
329 for (i = 0; i < avctx->height; i++) {
330 ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
331 t = *((uint16_t *)last);
332 last = cur;
333 cur += p->linesize[0];
334 }
335 } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
336 int j, width;
337 int Rc[3] = { 0, 0, 0 };
338
339 width = avctx->width * 3;
340 for (i = 0; i < avctx->height; i++) {
341 for (j = 0; j < 3; j++) {
342 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
343 width, 3, j, 8);
344 Rc[j] = last[j];
345 }
346 last = cur;
347 cur += p->linesize[0];
348 }
349 } else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
350 int j, width;
351 int Rc[3] = { 0, 0, 0 };
352
353 width = avctx->width * 3;
354 for (i = 0; i < avctx->height; i++) {
355 for (j = 2; j >= 0; j--) {
356 ls_encode_line(state, &pb2, last + j, cur + j, Rc[j],
357 width, 3, j, 8);
358 Rc[j] = last[j];
359 }
360 last = cur;
361 cur += p->linesize[0];
362 }
363 }
364
365 av_freep(&zero);
366 av_freep(&state);
367
368 /* the specification says that after doing 0xff escaping unused bits in
369 * the last byte must be set to 0, so just append 7 "optional" zero-bits
370 * to avoid special-casing. */
371 put_bits(&pb2, 7, 0);
372 size = put_bits_count(&pb2);
373 flush_put_bits(&pb2);
374 /* do escape coding */
375 init_get_bits(&gb, buf2, size);
376 size -= 7;
377 while (get_bits_count(&gb) < size) {
378 int v;
379 v = get_bits(&gb, 8);
380 put_bits(&pb, 8, v);
381 if (v == 0xFF) {
382 v = get_bits(&gb, 7);
383 put_bits(&pb, 8, v);
384 }
385 }
386 avpriv_align_put_bits(&pb);
387 av_free(buf2);
388
389 /* End of image */
390 put_marker(&pb, EOI);
391 flush_put_bits(&pb);
392
393 emms_c();
394
395 pkt->size = put_bits_count(&pb) >> 3;
396 pkt->flags |= AV_PKT_FLAG_KEY;
397 *got_packet = 1;
398 return 0;
399 }
400
401 static av_cold int encode_close(AVCodecContext *avctx)
402 {
403 av_frame_free(&avctx->coded_frame);
404 return 0;
405 }
406
407 static av_cold int encode_init_ls(AVCodecContext *ctx)
408 {
409 ctx->coded_frame = av_frame_alloc();
410 if (!ctx->coded_frame)
411 return AVERROR(ENOMEM);
412
413 ctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
414 ctx->coded_frame->key_frame = 1;
415
416 if (ctx->pix_fmt != AV_PIX_FMT_GRAY8 &&
417 ctx->pix_fmt != AV_PIX_FMT_GRAY16 &&
418 ctx->pix_fmt != AV_PIX_FMT_RGB24 &&
419 ctx->pix_fmt != AV_PIX_FMT_BGR24) {
420 av_log(ctx, AV_LOG_ERROR,
421 "Only grayscale and RGB24/BGR24 images are supported\n");
422 return -1;
423 }
424 return 0;
425 }
426
427 AVCodec ff_jpegls_encoder = {
428 .name = "jpegls",
429 .long_name = NULL_IF_CONFIG_SMALL("JPEG-LS"),
430 .type = AVMEDIA_TYPE_VIDEO,
431 .id = AV_CODEC_ID_JPEGLS,
432 .init = encode_init_ls,
433 .close = encode_close,
434 .capabilities = CODEC_CAP_FRAME_THREADS | CODEC_CAP_INTRA_ONLY,
435 .encode2 = encode_picture_ls,
436 .pix_fmts = (const enum AVPixelFormat[]) {
437 AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
438 AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,
439 AV_PIX_FMT_NONE
440 },
441 };