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eac3dec: get right of unnecessary left shifts in 16-bit * 24-bit
[FFMpeg-mirror/lagarith.git] / libavcodec / mjpegdec.c
blobd468133a189fc7b0ab80a89b5401769f068ef48b
1 /*
2 * MJPEG decoder
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2003 Alex Beregszaszi
5 * Copyright (c) 2003-2004 Michael Niedermayer
6 *
7 * Support for external huffman table, various fixes (AVID workaround),
8 * aspecting, new decode_frame mechanism and apple mjpeg-b support
9 * by Alex Beregszaszi
10 *
11 * This file is part of FFmpeg.
12 *
13 * FFmpeg is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU Lesser General Public
15 * License as published by the Free Software Foundation; either
16 * version 2.1 of the License, or (at your option) any later version.
17 *
18 * FFmpeg is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * Lesser General Public License for more details.
22 *
23 * You should have received a copy of the GNU Lesser General Public
24 * License along with FFmpeg; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 */
27
28 /**
29 * @file libavcodec/mjpegdec.c
30 * MJPEG decoder.
31 */
32
33 //#define DEBUG
34 #include <assert.h>
35
36 #include "avcodec.h"
37 #include "dsputil.h"
38 #include "mjpeg.h"
39 #include "mjpegdec.h"
40 #include "jpeglsdec.h"
41
42
43 static int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table,
44 int nb_codes, int use_static, int is_ac)
45 {
46 uint8_t huff_size[256+16];
47 uint16_t huff_code[256+16];
48
49 assert(nb_codes <= 256);
50
51 memset(huff_size, 0, sizeof(huff_size));
52 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
53
54 if(is_ac){
55 memmove(huff_size+16, huff_size, sizeof(uint8_t)*nb_codes);
56 memmove(huff_code+16, huff_code, sizeof(uint16_t)*nb_codes);
57 memset(huff_size, 0, sizeof(uint8_t)*16);
58 memset(huff_code, 0, sizeof(uint16_t)*16);
59 nb_codes += 16;
60 }
61
62 return init_vlc(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, use_static);
63 }
64
65 static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) {
66 build_vlc(&s->vlcs[0][0], ff_mjpeg_bits_dc_luminance,
67 ff_mjpeg_val_dc, 12, 0, 0);
68 build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,
69 ff_mjpeg_val_dc, 12, 0, 0);
70 build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance,
71 ff_mjpeg_val_ac_luminance, 251, 0, 1);
72 build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance,
73 ff_mjpeg_val_ac_chrominance, 251, 0, 1);
74 }
75
76 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
77 {
78 MJpegDecodeContext *s = avctx->priv_data;
79
80 s->avctx = avctx;
81 dsputil_init(&s->dsp, avctx);
82 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
83 s->buffer_size = 0;
84 s->buffer = NULL;
85 s->start_code = -1;
86 s->first_picture = 1;
87 s->org_height = avctx->coded_height;
88 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
89
90 build_basic_mjpeg_vlc(s);
91
92 if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
93 {
94 av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
95 init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
96 if (ff_mjpeg_decode_dht(s)) {
97 av_log(avctx, AV_LOG_ERROR, "mjpeg: error using external huffman table, switching back to internal\n");
98 build_basic_mjpeg_vlc(s);
99 }
100 }
101 if (avctx->extradata_size > 9 &&
102 AV_RL32(avctx->extradata + 4) == MKTAG('f','i','e','l')) {
103 if (avctx->extradata[9] == 6) { /* quicktime icefloe 019 */
104 s->interlace_polarity = 1; /* bottom field first */
105 av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
106 }
107 }
108
109 return 0;
110 }
111
112
113 /* quantize tables */
114 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
115 {
116 int len, index, i, j;
117
118 len = get_bits(&s->gb, 16) - 2;
119
120 while (len >= 65) {
121 /* only 8 bit precision handled */
122 if (get_bits(&s->gb, 4) != 0)
123 {
124 av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
125 return -1;
126 }
127 index = get_bits(&s->gb, 4);
128 if (index >= 4)
129 return -1;
130 av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
131 /* read quant table */
132 for(i=0;i<64;i++) {
133 j = s->scantable.permutated[i];
134 s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
135 }
136
137 //XXX FIXME finetune, and perhaps add dc too
138 s->qscale[index]= FFMAX(
139 s->quant_matrixes[index][s->scantable.permutated[1]],
140 s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
141 av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n", index, s->qscale[index]);
142 len -= 65;
143 }
144
145 return 0;
146 }
147
148 /* decode huffman tables and build VLC decoders */
149 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
150 {
151 int len, index, i, class, n, v, code_max;
152 uint8_t bits_table[17];
153 uint8_t val_table[256];
154
155 len = get_bits(&s->gb, 16) - 2;
156
157 while (len > 0) {
158 if (len < 17)
159 return -1;
160 class = get_bits(&s->gb, 4);
161 if (class >= 2)
162 return -1;
163 index = get_bits(&s->gb, 4);
164 if (index >= 4)
165 return -1;
166 n = 0;
167 for(i=1;i<=16;i++) {
168 bits_table[i] = get_bits(&s->gb, 8);
169 n += bits_table[i];
170 }
171 len -= 17;
172 if (len < n || n > 256)
173 return -1;
174
175 code_max = 0;
176 for(i=0;i<n;i++) {
177 v = get_bits(&s->gb, 8);
178 if (v > code_max)
179 code_max = v;
180 val_table[i] = v;
181 }
182 len -= n;
183
184 /* build VLC and flush previous vlc if present */
185 free_vlc(&s->vlcs[class][index]);
186 av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
187 class, index, code_max + 1);
188 if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1, 0, class > 0) < 0){
189 return -1;
190 }
191 }
192 return 0;
193 }
194
195 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
196 {
197 int len, nb_components, i, width, height, pix_fmt_id;
198
199 /* XXX: verify len field validity */
200 len = get_bits(&s->gb, 16);
201 s->bits= get_bits(&s->gb, 8);
202
203 if(s->pegasus_rct) s->bits=9;
204 if(s->bits==9 && !s->pegasus_rct) s->rct=1; //FIXME ugly
205
206 if (s->bits != 8 && !s->lossless){
207 av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
208 return -1;
209 }
210
211 height = get_bits(&s->gb, 16);
212 width = get_bits(&s->gb, 16);
213
214 //HACK for odd_height.mov
215 if(s->interlaced && s->width == width && s->height == height + 1)
216 height= s->height;
217
218 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
219 if(avcodec_check_dimensions(s->avctx, width, height))
220 return -1;
221
222 nb_components = get_bits(&s->gb, 8);
223 if (nb_components <= 0 ||
224 nb_components > MAX_COMPONENTS)
225 return -1;
226 if (s->ls && !(s->bits <= 8 || nb_components == 1)){
227 av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
228 return -1;
229 }
230 s->nb_components = nb_components;
231 s->h_max = 1;
232 s->v_max = 1;
233 for(i=0;i<nb_components;i++) {
234 /* component id */
235 s->component_id[i] = get_bits(&s->gb, 8) - 1;
236 s->h_count[i] = get_bits(&s->gb, 4);
237 s->v_count[i] = get_bits(&s->gb, 4);
238 /* compute hmax and vmax (only used in interleaved case) */
239 if (s->h_count[i] > s->h_max)
240 s->h_max = s->h_count[i];
241 if (s->v_count[i] > s->v_max)
242 s->v_max = s->v_count[i];
243 s->quant_index[i] = get_bits(&s->gb, 8);
244 if (s->quant_index[i] >= 4)
245 return -1;
246 av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
247 s->v_count[i], s->component_id[i], s->quant_index[i]);
248 }
249
250 if(s->ls && (s->h_max > 1 || s->v_max > 1)) {
251 av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n");
252 return -1;
253 }
254
255 if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;
256
257 /* if different size, realloc/alloc picture */
258 /* XXX: also check h_count and v_count */
259 if (width != s->width || height != s->height) {
260 av_freep(&s->qscale_table);
261
262 s->width = width;
263 s->height = height;
264 s->interlaced = 0;
265
266 /* test interlaced mode */
267 if (s->first_picture &&
268 s->org_height != 0 &&
269 s->height < ((s->org_height * 3) / 4)) {
270 s->interlaced = 1;
271 s->bottom_field = s->interlace_polarity;
272 s->picture.interlaced_frame = 1;
273 s->picture.top_field_first = !s->interlace_polarity;
274 height *= 2;
275 }
276
277 avcodec_set_dimensions(s->avctx, width, height);
278
279 s->qscale_table= av_mallocz((s->width+15)/16);
280
281 s->first_picture = 0;
282 }
283
284 if(s->interlaced && (s->bottom_field == !s->interlace_polarity))
285 return 0;
286
287 /* XXX: not complete test ! */
288 pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
289 (s->h_count[1] << 20) | (s->v_count[1] << 16) |
290 (s->h_count[2] << 12) | (s->v_count[2] << 8) |
291 (s->h_count[3] << 4) | s->v_count[3];
292 av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
293 if(!(pix_fmt_id & 0x10101010))
294 pix_fmt_id-= (pix_fmt_id & 0xF0F0F0F0)>>1;
295 if(!(pix_fmt_id & 0x01010101))
296 pix_fmt_id-= (pix_fmt_id & 0x0F0F0F0F)>>1;
297
298 switch(pix_fmt_id){
299 case 0x11111100:
300 if(s->rgb){
301 s->avctx->pix_fmt = PIX_FMT_RGB32;
302 }else
303 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
304 assert(s->nb_components==3);
305 break;
306 case 0x11000000:
307 s->avctx->pix_fmt = PIX_FMT_GRAY8;
308 break;
309 case 0x12111100:
310 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
311 break;
312 case 0x21111100:
313 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
314 break;
315 case 0x22111100:
316 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
317 break;
318 default:
319 av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
320 return -1;
321 }
322 if(s->ls){
323 if(s->nb_components > 1)
324 s->avctx->pix_fmt = PIX_FMT_RGB24;
325 else if(s->bits <= 8)
326 s->avctx->pix_fmt = PIX_FMT_GRAY8;
327 else
328 s->avctx->pix_fmt = PIX_FMT_GRAY16;
329 }
330
331 if(s->picture.data[0])
332 s->avctx->release_buffer(s->avctx, &s->picture);
333
334 s->picture.reference= 0;
335 if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
336 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
337 return -1;
338 }
339 s->picture.pict_type= FF_I_TYPE;
340 s->picture.key_frame= 1;
341
342 for(i=0; i<3; i++){
343 s->linesize[i]= s->picture.linesize[i] << s->interlaced;
344 }
345
346 // printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);
347
348 if (len != (8+(3*nb_components)))
349 {
350 av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
351 }
352
353 /* totally blank picture as progressive JPEG will only add details to it */
354 if(s->progressive){
355 int bw = (width + s->h_max*8-1) / (s->h_max*8);
356 int bh = (height + s->v_max*8-1) / (s->v_max*8);
357 for(i=0; i<s->nb_components; i++) {
358 int size = bw * bh * s->h_count[i] * s->v_count[i];
359 av_freep(&s->blocks[i]);
360 av_freep(&s->last_nnz[i]);
361 s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
362 s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
363 s->block_stride[i] = bw * s->h_count[i];
364 }
365 memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
366 }
367 return 0;
368 }
369
370 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
371 {
372 int code;
373 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
374 if (code < 0)
375 {
376 av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
377 &s->vlcs[0][dc_index]);
378 return 0xffff;
379 }
380
381 if(code)
382 return get_xbits(&s->gb, code);
383 else
384 return 0;
385 }
386
387 /* decode block and dequantize */
388 static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
389 int component, int dc_index, int ac_index, int16_t *quant_matrix)
390 {
391 int code, i, j, level, val;
392
393 /* DC coef */
394 val = mjpeg_decode_dc(s, dc_index);
395 if (val == 0xffff) {
396 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
397 return -1;
398 }
399 val = val * quant_matrix[0] + s->last_dc[component];
400 s->last_dc[component] = val;
401 block[0] = val;
402 /* AC coefs */
403 i = 0;
404 {OPEN_READER(re, &s->gb)
405 for(;;) {
406 UPDATE_CACHE(re, &s->gb);
407 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
408
409 /* EOB */
410 if (code == 0x10)
411 break;
412 i += ((unsigned)code) >> 4;
413 if(code != 0x100){
414 code &= 0xf;
415 if(code > MIN_CACHE_BITS - 16){
416 UPDATE_CACHE(re, &s->gb)
417 }
418 {
419 int cache=GET_CACHE(re,&s->gb);
420 int sign=(~cache)>>31;
421 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
422 }
423
424 LAST_SKIP_BITS(re, &s->gb, code)
425
426 if (i >= 63) {
427 if(i == 63){
428 j = s->scantable.permutated[63];
429 block[j] = level * quant_matrix[j];
430 break;
431 }
432 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
433 return -1;
434 }
435 j = s->scantable.permutated[i];
436 block[j] = level * quant_matrix[j];
437 }
438 }
439 CLOSE_READER(re, &s->gb)}
440
441 return 0;
442 }
443
444 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block, int component,
445 int dc_index, int16_t *quant_matrix, int Al)
446 {
447 int val;
448 s->dsp.clear_block(block);
449 val = mjpeg_decode_dc(s, dc_index);
450 if (val == 0xffff) {
451 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
452 return -1;
453 }
454 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
455 s->last_dc[component] = val;
456 block[0] = val;
457 return 0;
458 }
459
460 /* decode block and dequantize - progressive JPEG version */
461 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
462 int ac_index, int16_t *quant_matrix,
463 int ss, int se, int Al, int *EOBRUN)
464 {
465 int code, i, j, level, val, run;
466
467 if(*EOBRUN){
468 (*EOBRUN)--;
469 return 0;
470 }
471 {OPEN_READER(re, &s->gb)
472 for(i=ss;;i++) {
473 UPDATE_CACHE(re, &s->gb);
474 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
475 /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */
476 code -= 16;
477 if(code & 0xF) {
478 i += ((unsigned) code) >> 4;
479 code &= 0xf;
480 if(code > MIN_CACHE_BITS - 16){
481 UPDATE_CACHE(re, &s->gb)
482 }
483 {
484 int cache=GET_CACHE(re,&s->gb);
485 int sign=(~cache)>>31;
486 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
487 }
488
489 LAST_SKIP_BITS(re, &s->gb, code)
490
491 if (i >= se) {
492 if(i == se){
493 j = s->scantable.permutated[se];
494 block[j] = level * quant_matrix[j] << Al;
495 break;
496 }
497 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
498 return -1;
499 }
500 j = s->scantable.permutated[i];
501 block[j] = level * quant_matrix[j] << Al;
502 }else{
503 run = ((unsigned) code) >> 4;
504 if(run == 0xF){// ZRL - skip 15 coefficients
505 i += 15;
506 }else{
507 val = run;
508 run = (1 << run);
509 UPDATE_CACHE(re, &s->gb);
510 run += (GET_CACHE(re, &s->gb) >> (32 - val)) & (run - 1);
511 if(val)
512 LAST_SKIP_BITS(re, &s->gb, val);
513 *EOBRUN = run - 1;
514 break;
515 }
516 }
517 }
518 CLOSE_READER(re, &s->gb)}
519 if(i > *last_nnz)
520 *last_nnz = i;
521 return 0;
522 }
523
524 #define REFINE_BIT(j) {\
525 UPDATE_CACHE(re, &s->gb);\
526 sign = block[j]>>15;\
527 block[j] += SHOW_UBITS(re, &s->gb, 1) * ((quant_matrix[j]^sign)-sign) << Al;\
528 LAST_SKIP_BITS(re, &s->gb, 1);\
529 }
530
531 #define ZERO_RUN \
532 for(;;i++) {\
533 if(i > last) {\
534 i += run;\
535 if(i > se) {\
536 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);\
537 return -1;\
538 }\
539 break;\
540 }\
541 j = s->scantable.permutated[i];\
542 if(block[j])\
543 REFINE_BIT(j)\
544 else if(run-- == 0)\
545 break;\
546 }
547
548 /* decode block and dequantize - progressive JPEG refinement pass */
549 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
550 int ac_index, int16_t *quant_matrix,
551 int ss, int se, int Al, int *EOBRUN)
552 {
553 int code, i=ss, j, sign, val, run;
554 int last = FFMIN(se, *last_nnz);
555
556 OPEN_READER(re, &s->gb);
557 if(*EOBRUN)
558 (*EOBRUN)--;
559 else {
560 for(;;i++) {
561 UPDATE_CACHE(re, &s->gb);
562 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
563 /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */
564 code -= 16;
565 if(code & 0xF) {
566 run = ((unsigned) code) >> 4;
567 UPDATE_CACHE(re, &s->gb);
568 val = SHOW_UBITS(re, &s->gb, 1);
569 LAST_SKIP_BITS(re, &s->gb, 1);
570 ZERO_RUN;
571 j = s->scantable.permutated[i];
572 val--;
573 block[j] = ((quant_matrix[j]^val)-val) << Al;
574 if(i == se) {
575 if(i > *last_nnz)
576 *last_nnz = i;
577 CLOSE_READER(re, &s->gb)
578 return 0;
579 }
580 }else{
581 run = ((unsigned) code) >> 4;
582 if(run == 0xF){
583 ZERO_RUN;
584 }else{
585 val = run;
586 run = (1 << run);
587 if(val) {
588 UPDATE_CACHE(re, &s->gb);
589 run += SHOW_UBITS(re, &s->gb, val);
590 LAST_SKIP_BITS(re, &s->gb, val);
591 }
592 *EOBRUN = run - 1;
593 break;
594 }
595 }
596 }
597
598 if(i > *last_nnz)
599 *last_nnz = i;
600 }
601
602 for(;i<=last;i++) {
603 j = s->scantable.permutated[i];
604 if(block[j])
605 REFINE_BIT(j)
606 }
607 CLOSE_READER(re, &s->gb);
608
609 return 0;
610 }
611 #undef REFINE_BIT
612 #undef ZERO_RUN
613
614 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
615 int i, mb_x, mb_y;
616 uint16_t buffer[32768][4];
617 int left[3], top[3], topleft[3];
618 const int linesize= s->linesize[0];
619 const int mask= (1<<s->bits)-1;
620
621 if((unsigned)s->mb_width > 32768) //dynamic alloc
622 return -1;
623
624 for(i=0; i<3; i++){
625 buffer[0][i]= 1 << (s->bits + point_transform - 1);
626 }
627 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
628 const int modified_predictor= mb_y ? predictor : 1;
629 uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
630
631 if (s->interlaced && s->bottom_field)
632 ptr += linesize >> 1;
633
634 for(i=0; i<3; i++){
635 top[i]= left[i]= topleft[i]= buffer[0][i];
636 }
637 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
638 if (s->restart_interval && !s->restart_count)
639 s->restart_count = s->restart_interval;
640
641 for(i=0;i<3;i++) {
642 int pred;
643
644 topleft[i]= top[i];
645 top[i]= buffer[mb_x][i];
646
647 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
648
649 left[i]=
650 buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
651 }
652
653 if (s->restart_interval && !--s->restart_count) {
654 align_get_bits(&s->gb);
655 skip_bits(&s->gb, 16); /* skip RSTn */
656 }
657 }
658
659 if(s->rct){
660 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
661 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
662 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
663 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
664 }
665 }else if(s->pegasus_rct){
666 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
667 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
668 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
669 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
670 }
671 }else{
672 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
673 ptr[4*mb_x+0] = buffer[mb_x][0];
674 ptr[4*mb_x+1] = buffer[mb_x][1];
675 ptr[4*mb_x+2] = buffer[mb_x][2];
676 }
677 }
678 }
679 return 0;
680 }
681
682 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
683 int i, mb_x, mb_y;
684 const int nb_components=3;
685
686 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
687 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
688 if (s->restart_interval && !s->restart_count)
689 s->restart_count = s->restart_interval;
690
691 if(mb_x==0 || mb_y==0 || s->interlaced){
692 for(i=0;i<nb_components;i++) {
693 uint8_t *ptr;
694 int n, h, v, x, y, c, j, linesize;
695 n = s->nb_blocks[i];
696 c = s->comp_index[i];
697 h = s->h_scount[i];
698 v = s->v_scount[i];
699 x = 0;
700 y = 0;
701 linesize= s->linesize[c];
702
703 for(j=0; j<n; j++) {
704 int pred;
705
706 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
707 if(y==0 && mb_y==0){
708 if(x==0 && mb_x==0){
709 pred= 128 << point_transform;
710 }else{
711 pred= ptr[-1];
712 }
713 }else{
714 if(x==0 && mb_x==0){
715 pred= ptr[-linesize];
716 }else{
717 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
718 }
719 }
720
721 if (s->interlaced && s->bottom_field)
722 ptr += linesize >> 1;
723 *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
724
725 if (++x == h) {
726 x = 0;
727 y++;
728 }
729 }
730 }
731 }else{
732 for(i=0;i<nb_components;i++) {
733 uint8_t *ptr;
734 int n, h, v, x, y, c, j, linesize;
735 n = s->nb_blocks[i];
736 c = s->comp_index[i];
737 h = s->h_scount[i];
738 v = s->v_scount[i];
739 x = 0;
740 y = 0;
741 linesize= s->linesize[c];
742
743 for(j=0; j<n; j++) {
744 int pred;
745
746 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
747 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
748 *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
749 if (++x == h) {
750 x = 0;
751 y++;
752 }
753 }
754 }
755 }
756 if (s->restart_interval && !--s->restart_count) {
757 align_get_bits(&s->gb);
758 skip_bits(&s->gb, 16); /* skip RSTn */
759 }
760 }
761 }
762 return 0;
763 }
764
765 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al){
766 int i, mb_x, mb_y;
767 uint8_t* data[MAX_COMPONENTS];
768 int linesize[MAX_COMPONENTS];
769
770 for(i=0; i < nb_components; i++) {
771 int c = s->comp_index[i];
772 data[c] = s->picture.data[c];
773 linesize[c]=s->linesize[c];
774 s->coefs_finished[c] |= 1;
775 if(s->avctx->codec->id==CODEC_ID_AMV) {
776 //picture should be flipped upside-down for this codec
777 assert(!(s->avctx->flags & CODEC_FLAG_EMU_EDGE));
778 data[c] += (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 ));
779 linesize[c] *= -1;
780 }
781 }
782
783 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
784 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
785 if (s->restart_interval && !s->restart_count)
786 s->restart_count = s->restart_interval;
787
788 for(i=0;i<nb_components;i++) {
789 uint8_t *ptr;
790 int n, h, v, x, y, c, j;
791 n = s->nb_blocks[i];
792 c = s->comp_index[i];
793 h = s->h_scount[i];
794 v = s->v_scount[i];
795 x = 0;
796 y = 0;
797 for(j=0;j<n;j++) {
798 ptr = data[c] +
799 (((linesize[c] * (v * mb_y + y) * 8) +
800 (h * mb_x + x) * 8) >> s->avctx->lowres);
801 if(s->interlaced && s->bottom_field)
802 ptr += linesize[c] >> 1;
803 if(!s->progressive) {
804 s->dsp.clear_block(s->block);
805 if(decode_block(s, s->block, i,
806 s->dc_index[i], s->ac_index[i],
807 s->quant_matrixes[ s->quant_index[c] ]) < 0) {
808 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
809 return -1;
810 }
811 s->dsp.idct_put(ptr, linesize[c], s->block);
812 } else {
813 int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x);
814 DCTELEM *block = s->blocks[c][block_idx];
815 if(Ah)
816 block[0] += get_bits1(&s->gb) * s->quant_matrixes[ s->quant_index[c] ][0] << Al;
817 else if(decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[ s->quant_index[c] ], Al) < 0) {
818 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
819 return -1;
820 }
821 }
822 // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
823 //av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n", mb_x, mb_y, x, y, c, s->bottom_field, (v * mb_y + y) * 8, (h * mb_x + x) * 8);
824 if (++x == h) {
825 x = 0;
826 y++;
827 }
828 }
829 }
830
831 if (s->restart_interval && !--s->restart_count) {
832 align_get_bits(&s->gb);
833 skip_bits(&s->gb, 16); /* skip RSTn */
834 for (i=0; i<nb_components; i++) /* reset dc */
835 s->last_dc[i] = 1024;
836 }
837 }
838 }
839 return 0;
840 }
841
842 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al){
843 int mb_x, mb_y;
844 int EOBRUN = 0;
845 int c = s->comp_index[0];
846 uint8_t* data = s->picture.data[c];
847 int linesize = s->linesize[c];
848 int last_scan = 0;
849 int16_t *quant_matrix = s->quant_matrixes[ s->quant_index[c] ];
850
851 if(!Al) {
852 s->coefs_finished[c] |= (1LL<<(se+1))-(1LL<<ss);
853 last_scan = !~s->coefs_finished[c];
854 }
855
856 if(s->interlaced && s->bottom_field)
857 data += linesize >> 1;
858
859 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
860 uint8_t *ptr = data + (mb_y*linesize*8 >> s->avctx->lowres);
861 int block_idx = mb_y * s->block_stride[c];
862 DCTELEM (*block)[64] = &s->blocks[c][block_idx];
863 uint8_t *last_nnz = &s->last_nnz[c][block_idx];
864 for(mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
865 int ret;
866 if(Ah)
867 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
868 quant_matrix, ss, se, Al, &EOBRUN);
869 else
870 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
871 quant_matrix, ss, se, Al, &EOBRUN);
872 if(ret < 0) {
873 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
874 return -1;
875 }
876 if(last_scan) {
877 s->dsp.idct_put(ptr, linesize, *block);
878 ptr += 8 >> s->avctx->lowres;
879 }
880 }
881 }
882 return 0;
883 }
884
885 int ff_mjpeg_decode_sos(MJpegDecodeContext *s)
886 {
887 int len, nb_components, i, h, v, predictor, point_transform;
888 int index, id;
889 const int block_size= s->lossless ? 1 : 8;
890 int ilv, prev_shift;
891
892 /* XXX: verify len field validity */
893 len = get_bits(&s->gb, 16);
894 nb_components = get_bits(&s->gb, 8);
895 if (len != 6+2*nb_components)
896 {
897 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
898 return -1;
899 }
900 for(i=0;i<nb_components;i++) {
901 id = get_bits(&s->gb, 8) - 1;
902 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
903 /* find component index */
904 for(index=0;index<s->nb_components;index++)
905 if (id == s->component_id[index])
906 break;
907 if (index == s->nb_components)
908 {
909 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index);
910 return -1;
911 }
912
913 s->comp_index[i] = index;
914
915 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
916 s->h_scount[i] = s->h_count[index];
917 s->v_scount[i] = s->v_count[index];
918
919 s->dc_index[i] = get_bits(&s->gb, 4);
920 s->ac_index[i] = get_bits(&s->gb, 4);
921
922 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
923 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
924 goto out_of_range;
925 #if 0 //buggy
926 switch(s->start_code)
927 {
928 case SOF0:
929 if (dc_index[i] > 1 || ac_index[i] > 1)
930 goto out_of_range;
931 break;
932 case SOF1:
933 case SOF2:
934 if (dc_index[i] > 3 || ac_index[i] > 3)
935 goto out_of_range;
936 break;
937 case SOF3:
938 if (dc_index[i] > 3 || ac_index[i] != 0)
939 goto out_of_range;
940 break;
941 }
942 #endif
943 }
944
945 predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
946 ilv= get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
947 prev_shift = get_bits(&s->gb, 4); /* Ah */
948 point_transform= get_bits(&s->gb, 4); /* Al */
949
950 for(i=0;i<nb_components;i++)
951 s->last_dc[i] = 1024;
952
953 if (nb_components > 1) {
954 /* interleaved stream */
955 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
956 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
957 } else if(!s->ls) { /* skip this for JPEG-LS */
958 h = s->h_max / s->h_scount[0];
959 v = s->v_max / s->v_scount[0];
960 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
961 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
962 s->nb_blocks[0] = 1;
963 s->h_scount[0] = 1;
964 s->v_scount[0] = 1;
965 }
966
967 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
968 av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n", s->lossless ? "lossless" : "sequencial DCT", s->rgb ? "RGB" : "",
969 predictor, point_transform, ilv, s->bits,
970 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
971
972
973 /* mjpeg-b can have padding bytes between sos and image data, skip them */
974 for (i = s->mjpb_skiptosod; i > 0; i--)
975 skip_bits(&s->gb, 8);
976
977 if(s->lossless){
978 if(CONFIG_JPEGLS_DECODER && s->ls){
979 // for(){
980 // reset_ls_coding_parameters(s, 0);
981
982 if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
983 return -1;
984 }else{
985 if(s->rgb){
986 if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
987 return -1;
988 }else{
989 if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
990 return -1;
991 }
992 }
993 }else{
994 if(s->progressive && predictor) {
995 if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0)
996 return -1;
997 } else {
998 if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform) < 0)
999 return -1;
1000 }
1001 }
1002 emms_c();
1003 return 0;
1004 out_of_range:
1005 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1006 return -1;
1007 }
1008
1009 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1010 {
1011 if (get_bits(&s->gb, 16) != 4)
1012 return -1;
1013 s->restart_interval = get_bits(&s->gb, 16);
1014 s->restart_count = 0;
1015 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);
1016
1017 return 0;
1018 }
1019
1020 static int mjpeg_decode_app(MJpegDecodeContext *s)
1021 {
1022 int len, id, i;
1023
1024 len = get_bits(&s->gb, 16);
1025 if (len < 5)
1026 return -1;
1027 if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)
1028 return -1;
1029
1030 id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
1031 id = be2me_32(id);
1032 len -= 6;
1033
1034 if(s->avctx->debug & FF_DEBUG_STARTCODE){
1035 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1036 }
1037
1038 /* buggy AVID, it puts EOI only at every 10th frame */
1039 /* also this fourcc is used by non-avid files too, it holds some
1040 informations, but it's always present in AVID creates files */
1041 if (id == AV_RL32("AVI1"))
1042 {
1043 /* structure:
1044 4bytes AVI1
1045 1bytes polarity
1046 1bytes always zero
1047 4bytes field_size
1048 4bytes field_size_less_padding
1049 */
1050 s->buggy_avid = 1;
1051 // if (s->first_picture)
1052 // printf("mjpeg: workarounding buggy AVID\n");
1053 i = get_bits(&s->gb, 8);
1054 if (i==2) s->bottom_field= 1;
1055 else if(i==1) s->bottom_field= 0;
1056 #if 0
1057 skip_bits(&s->gb, 8);
1058 skip_bits(&s->gb, 32);
1059 skip_bits(&s->gb, 32);
1060 len -= 10;
1061 #endif
1062 // if (s->interlace_polarity)
1063 // printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
1064 goto out;
1065 }
1066
1067 // len -= 2;
1068
1069 if (id == AV_RL32("JFIF"))
1070 {
1071 int t_w, t_h, v1, v2;
1072 skip_bits(&s->gb, 8); /* the trailing zero-byte */
1073 v1= get_bits(&s->gb, 8);
1074 v2= get_bits(&s->gb, 8);
1075 skip_bits(&s->gb, 8);
1076
1077 s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
1078 s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
1079
1080 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1081 av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1082 v1, v2,
1083 s->avctx->sample_aspect_ratio.num,
1084 s->avctx->sample_aspect_ratio.den
1085 );
1086
1087 t_w = get_bits(&s->gb, 8);
1088 t_h = get_bits(&s->gb, 8);
1089 if (t_w && t_h)
1090 {
1091 /* skip thumbnail */
1092 if (len-10-(t_w*t_h*3) > 0)
1093 len -= t_w*t_h*3;
1094 }
1095 len -= 10;
1096 goto out;
1097 }
1098
1099 if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))
1100 {
1101 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1102 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1103 skip_bits(&s->gb, 16); /* version */
1104 skip_bits(&s->gb, 16); /* flags0 */
1105 skip_bits(&s->gb, 16); /* flags1 */
1106 skip_bits(&s->gb, 8); /* transform */
1107 len -= 7;
1108 goto out;
1109 }
1110
1111 if (id == AV_RL32("LJIF")){
1112 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1113 av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");
1114 skip_bits(&s->gb, 16); /* version ? */
1115 skip_bits(&s->gb, 16); /* unknwon always 0? */
1116 skip_bits(&s->gb, 16); /* unknwon always 0? */
1117 skip_bits(&s->gb, 16); /* unknwon always 0? */
1118 switch( get_bits(&s->gb, 8)){
1119 case 1:
1120 s->rgb= 1;
1121 s->pegasus_rct=0;
1122 break;
1123 case 2:
1124 s->rgb= 1;
1125 s->pegasus_rct=1;
1126 break;
1127 default:
1128 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1129 }
1130 len -= 9;
1131 goto out;
1132 }
1133
1134 /* Apple MJPEG-A */
1135 if ((s->start_code == APP1) && (len > (0x28 - 8)))
1136 {
1137 id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
1138 id = be2me_32(id);
1139 len -= 4;
1140 if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */
1141 {
1142 #if 0
1143 skip_bits(&s->gb, 32); /* field size */
1144 skip_bits(&s->gb, 32); /* pad field size */
1145 skip_bits(&s->gb, 32); /* next off */
1146 skip_bits(&s->gb, 32); /* quant off */
1147 skip_bits(&s->gb, 32); /* huff off */
1148 skip_bits(&s->gb, 32); /* image off */
1149 skip_bits(&s->gb, 32); /* scan off */
1150 skip_bits(&s->gb, 32); /* data off */
1151 #endif
1152 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1153 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1154 }
1155 }
1156
1157 out:
1158 /* slow but needed for extreme adobe jpegs */
1159 if (len < 0)
1160 av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");
1161 while(--len > 0)
1162 skip_bits(&s->gb, 8);
1163
1164 return 0;
1165 }
1166
1167 static int mjpeg_decode_com(MJpegDecodeContext *s)
1168 {
1169 int len = get_bits(&s->gb, 16);
1170 if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
1171 char *cbuf = av_malloc(len - 1);
1172 if (cbuf) {
1173 int i;
1174 for (i = 0; i < len - 2; i++)
1175 cbuf[i] = get_bits(&s->gb, 8);
1176 if (i > 0 && cbuf[i-1] == '\n')
1177 cbuf[i-1] = 0;
1178 else
1179 cbuf[i] = 0;
1180
1181 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1182 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1183
1184 /* buggy avid, it puts EOI only at every 10th frame */
1185 if (!strcmp(cbuf, "AVID"))
1186 {
1187 s->buggy_avid = 1;
1188 // if (s->first_picture)
1189 // printf("mjpeg: workarounding buggy AVID\n");
1190 }
1191 else if(!strcmp(cbuf, "CS=ITU601")){
1192 s->cs_itu601= 1;
1193 }
1194
1195 av_free(cbuf);
1196 }
1197 }
1198
1199 return 0;
1200 }
1201
1202 #if 0
1203 static int valid_marker_list[] =
1204 {
1205 /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
1206 /* 0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1207 /* 1 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1208 /* 2 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1209 /* 3 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1210 /* 4 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1211 /* 5 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1212 /* 6 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1213 /* 7 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1214 /* 8 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1215 /* 9 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1216 /* a */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1217 /* b */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1218 /* c */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1219 /* d */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1220 /* e */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1221 /* f */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
1222 }
1223 #endif
1224
1225 /* return the 8 bit start code value and update the search
1226 state. Return -1 if no start code found */
1227 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1228 {
1229 const uint8_t *buf_ptr;
1230 unsigned int v, v2;
1231 int val;
1232 #ifdef DEBUG
1233 int skipped=0;
1234 #endif
1235
1236 buf_ptr = *pbuf_ptr;
1237 while (buf_ptr < buf_end) {
1238 v = *buf_ptr++;
1239 v2 = *buf_ptr;
1240 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1241 val = *buf_ptr++;
1242 goto found;
1243 }
1244 #ifdef DEBUG
1245 skipped++;
1246 #endif
1247 }
1248 val = -1;
1249 found:
1250 #ifdef DEBUG
1251 av_log(NULL, AV_LOG_VERBOSE, "find_marker skipped %d bytes\n", skipped);
1252 #endif
1253 *pbuf_ptr = buf_ptr;
1254 return val;
1255 }
1256
1257 int ff_mjpeg_decode_frame(AVCodecContext *avctx,
1258 void *data, int *data_size,
1259 AVPacket *avpkt)
1260 {
1261 const uint8_t *buf = avpkt->data;
1262 int buf_size = avpkt->size;
1263 MJpegDecodeContext *s = avctx->priv_data;
1264 const uint8_t *buf_end, *buf_ptr;
1265 int start_code;
1266 AVFrame *picture = data;
1267
1268 buf_ptr = buf;
1269 buf_end = buf + buf_size;
1270 while (buf_ptr < buf_end) {
1271 /* find start next marker */
1272 start_code = find_marker(&buf_ptr, buf_end);
1273 {
1274 /* EOF */
1275 if (start_code < 0) {
1276 goto the_end;
1277 } else {
1278 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);
1279
1280 if ((buf_end - buf_ptr) > s->buffer_size)
1281 {
1282 av_free(s->buffer);
1283 s->buffer_size = buf_end-buf_ptr;
1284 s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
1285 av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
1286 s->buffer_size);
1287 }
1288
1289 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1290 if (start_code == SOS && !s->ls)
1291 {
1292 const uint8_t *src = buf_ptr;
1293 uint8_t *dst = s->buffer;
1294
1295 while (src<buf_end)
1296 {
1297 uint8_t x = *(src++);
1298
1299 *(dst++) = x;
1300 if (avctx->codec_id != CODEC_ID_THP)
1301 {
1302 if (x == 0xff) {
1303 while (src < buf_end && x == 0xff)
1304 x = *(src++);
1305
1306 if (x >= 0xd0 && x <= 0xd7)
1307 *(dst++) = x;
1308 else if (x)
1309 break;
1310 }
1311 }
1312 }
1313 init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);
1314
1315 av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1316 (buf_end - buf_ptr) - (dst - s->buffer));
1317 }
1318 else if(start_code == SOS && s->ls){
1319 const uint8_t *src = buf_ptr;
1320 uint8_t *dst = s->buffer;
1321 int bit_count = 0;
1322 int t = 0, b = 0;
1323 PutBitContext pb;
1324
1325 s->cur_scan++;
1326
1327 /* find marker */
1328 while (src + t < buf_end){
1329 uint8_t x = src[t++];
1330 if (x == 0xff){
1331 while((src + t < buf_end) && x == 0xff)
1332 x = src[t++];
1333 if (x & 0x80) {
1334 t -= 2;
1335 break;
1336 }
1337 }
1338 }
1339 bit_count = t * 8;
1340
1341 init_put_bits(&pb, dst, t);
1342
1343 /* unescape bitstream */
1344 while(b < t){
1345 uint8_t x = src[b++];
1346 put_bits(&pb, 8, x);
1347 if(x == 0xFF){
1348 x = src[b++];
1349 put_bits(&pb, 7, x);
1350 bit_count--;
1351 }
1352 }
1353 flush_put_bits(&pb);
1354
1355 init_get_bits(&s->gb, dst, bit_count);
1356 }
1357 else
1358 init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);
1359
1360 s->start_code = start_code;
1361 if(s->avctx->debug & FF_DEBUG_STARTCODE){
1362 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1363 }
1364
1365 /* process markers */
1366 if (start_code >= 0xd0 && start_code <= 0xd7) {
1367 av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);
1368 /* APP fields */
1369 } else if (start_code >= APP0 && start_code <= APP15) {
1370 mjpeg_decode_app(s);
1371 /* Comment */
1372 } else if (start_code == COM){
1373 mjpeg_decode_com(s);
1374 }
1375
1376 switch(start_code) {
1377 case SOI:
1378 s->restart_interval = 0;
1379
1380 s->restart_count = 0;
1381 /* nothing to do on SOI */
1382 break;
1383 case DQT:
1384 ff_mjpeg_decode_dqt(s);
1385 break;
1386 case DHT:
1387 if(ff_mjpeg_decode_dht(s) < 0){
1388 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1389 return -1;
1390 }
1391 break;
1392 case SOF0:
1393 s->lossless=0;
1394 s->ls=0;
1395 s->progressive=0;
1396 if (ff_mjpeg_decode_sof(s) < 0)
1397 return -1;
1398 break;
1399 case SOF2:
1400 s->lossless=0;
1401 s->ls=0;
1402 s->progressive=1;
1403 if (ff_mjpeg_decode_sof(s) < 0)
1404 return -1;
1405 break;
1406 case SOF3:
1407 s->lossless=1;
1408 s->ls=0;
1409 s->progressive=0;
1410 if (ff_mjpeg_decode_sof(s) < 0)
1411 return -1;
1412 break;
1413 case SOF48:
1414 s->lossless=1;
1415 s->ls=1;
1416 s->progressive=0;
1417 if (ff_mjpeg_decode_sof(s) < 0)
1418 return -1;
1419 break;
1420 case LSE:
1421 if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
1422 return -1;
1423 break;
1424 case EOI:
1425 s->cur_scan = 0;
1426 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1427 break;
1428 eoi_parser:
1429 {
1430 if (s->interlaced) {
1431 s->bottom_field ^= 1;
1432 /* if not bottom field, do not output image yet */
1433 if (s->bottom_field == !s->interlace_polarity)
1434 goto not_the_end;
1435 }
1436 *picture = s->picture;
1437 *data_size = sizeof(AVFrame);
1438
1439 if(!s->lossless){
1440 picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);
1441 picture->qstride= 0;
1442 picture->qscale_table= s->qscale_table;
1443 memset(picture->qscale_table, picture->quality, (s->width+15)/16);
1444 if(avctx->debug & FF_DEBUG_QP)
1445 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
1446 picture->quality*= FF_QP2LAMBDA;
1447 }
1448
1449 goto the_end;
1450 }
1451 break;
1452 case SOS:
1453 ff_mjpeg_decode_sos(s);
1454 /* buggy avid puts EOI every 10-20th frame */
1455 /* if restart period is over process EOI */
1456 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1457 goto eoi_parser;
1458 break;
1459 case DRI:
1460 mjpeg_decode_dri(s);
1461 break;
1462 case SOF1:
1463 case SOF5:
1464 case SOF6:
1465 case SOF7:
1466 case SOF9:
1467 case SOF10:
1468 case SOF11:
1469 case SOF13:
1470 case SOF14:
1471 case SOF15:
1472 case JPG:
1473 av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);
1474 break;
1475 // default:
1476 // printf("mjpeg: unsupported marker (%x)\n", start_code);
1477 // break;
1478 }
1479
1480 not_the_end:
1481 /* eof process start code */
1482 buf_ptr += (get_bits_count(&s->gb)+7)/8;
1483 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",
1484 (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
1485 }
1486 }
1487 }
1488 the_end:
1489 av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);
1490 // return buf_end - buf_ptr;
1491 return buf_ptr - buf;
1492 }
1493
1494 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1495 {
1496 MJpegDecodeContext *s = avctx->priv_data;
1497 int i, j;
1498
1499 av_free(s->buffer);
1500 av_free(s->qscale_table);
1501
1502 for(i=0;i<2;i++) {
1503 for(j=0;j<4;j++)
1504 free_vlc(&s->vlcs[i][j]);
1505 }
1506 for(i=0; i<MAX_COMPONENTS; i++) {
1507 av_freep(&s->blocks[i]);
1508 av_freep(&s->last_nnz[i]);
1509 }
1510 return 0;
1511 }
1512
1513 AVCodec mjpeg_decoder = {
1514 "mjpeg",
1515 CODEC_TYPE_VIDEO,
1516 CODEC_ID_MJPEG,
1517 sizeof(MJpegDecodeContext),
1518 ff_mjpeg_decode_init,
1519 NULL,
1520 ff_mjpeg_decode_end,
1521 ff_mjpeg_decode_frame,
1522 CODEC_CAP_DR1,
1523 NULL,
1524 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1525 };
1526
1527 AVCodec thp_decoder = {
1528 "thp",
1529 CODEC_TYPE_VIDEO,
1530 CODEC_ID_THP,
1531 sizeof(MJpegDecodeContext),
1532 ff_mjpeg_decode_init,
1533 NULL,
1534 ff_mjpeg_decode_end,
1535 ff_mjpeg_decode_frame,
1536 CODEC_CAP_DR1,
1537 NULL,
1538 .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
1539 };
ffmpeg Lagarith lossless decoder