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Rename dec2() function
[FFMpeg-mirror/DVCPRO-HD.git] / libavcodec / mjpegdec.c
bloba8929fc4622e7c4c19bce4602429de2116ac72aa
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 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_luminance, 12, 0, 0);
68 build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,
69 ff_mjpeg_val_dc_chrominance, 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
89 build_basic_mjpeg_vlc(s);
90
91 if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
92 {
93 av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
94 init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
95 if (ff_mjpeg_decode_dht(s)) {
96 av_log(avctx, AV_LOG_ERROR, "mjpeg: error using external huffman table, switching back to internal\n");
97 build_basic_mjpeg_vlc(s);
98 }
99 }
100 if (avctx->extradata_size > 9 &&
101 AV_RL32(avctx->extradata + 4) == MKTAG('f','i','e','l')) {
102 if (avctx->extradata[9] == 6) { /* quicktime icefloe 019 */
103 s->interlace_polarity = 1; /* bottom field first */
104 av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
105 }
106 }
107
108 return 0;
109 }
110
111
112 /* quantize tables */
113 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
114 {
115 int len, index, i, j;
116
117 len = get_bits(&s->gb, 16) - 2;
118
119 while (len >= 65) {
120 /* only 8 bit precision handled */
121 if (get_bits(&s->gb, 4) != 0)
122 {
123 av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
124 return -1;
125 }
126 index = get_bits(&s->gb, 4);
127 if (index >= 4)
128 return -1;
129 av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
130 /* read quant table */
131 for(i=0;i<64;i++) {
132 j = s->scantable.permutated[i];
133 s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
134 }
135
136 //XXX FIXME finetune, and perhaps add dc too
137 s->qscale[index]= FFMAX(
138 s->quant_matrixes[index][s->scantable.permutated[1]],
139 s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
140 av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n", index, s->qscale[index]);
141 len -= 65;
142 }
143
144 return 0;
145 }
146
147 /* decode huffman tables and build VLC decoders */
148 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
149 {
150 int len, index, i, class, n, v, code_max;
151 uint8_t bits_table[17];
152 uint8_t val_table[256];
153
154 len = get_bits(&s->gb, 16) - 2;
155
156 while (len > 0) {
157 if (len < 17)
158 return -1;
159 class = get_bits(&s->gb, 4);
160 if (class >= 2)
161 return -1;
162 index = get_bits(&s->gb, 4);
163 if (index >= 4)
164 return -1;
165 n = 0;
166 for(i=1;i<=16;i++) {
167 bits_table[i] = get_bits(&s->gb, 8);
168 n += bits_table[i];
169 }
170 len -= 17;
171 if (len < n || n > 256)
172 return -1;
173
174 code_max = 0;
175 for(i=0;i<n;i++) {
176 v = get_bits(&s->gb, 8);
177 if (v > code_max)
178 code_max = v;
179 val_table[i] = v;
180 }
181 len -= n;
182
183 /* build VLC and flush previous vlc if present */
184 free_vlc(&s->vlcs[class][index]);
185 av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
186 class, index, code_max + 1);
187 if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1, 0, class > 0) < 0){
188 return -1;
189 }
190 }
191 return 0;
192 }
193
194 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
195 {
196 int len, nb_components, i, width, height, pix_fmt_id;
197
198 /* XXX: verify len field validity */
199 len = get_bits(&s->gb, 16);
200 s->bits= get_bits(&s->gb, 8);
201
202 if(s->pegasus_rct) s->bits=9;
203 if(s->bits==9 && !s->pegasus_rct) s->rct=1; //FIXME ugly
204
205 if (s->bits != 8 && !s->lossless){
206 av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
207 return -1;
208 }
209
210 height = get_bits(&s->gb, 16);
211 width = get_bits(&s->gb, 16);
212
213 //HACK for odd_height.mov
214 if(s->interlaced && s->width == width && s->height == height + 1)
215 height= s->height;
216
217 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
218 if(avcodec_check_dimensions(s->avctx, width, height))
219 return -1;
220
221 nb_components = get_bits(&s->gb, 8);
222 if (nb_components <= 0 ||
223 nb_components > MAX_COMPONENTS)
224 return -1;
225 if (s->ls && !(s->bits <= 8 || nb_components == 1)){
226 av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
227 return -1;
228 }
229 s->nb_components = nb_components;
230 s->h_max = 1;
231 s->v_max = 1;
232 for(i=0;i<nb_components;i++) {
233 /* component id */
234 s->component_id[i] = get_bits(&s->gb, 8) - 1;
235 s->h_count[i] = get_bits(&s->gb, 4);
236 s->v_count[i] = get_bits(&s->gb, 4);
237 /* compute hmax and vmax (only used in interleaved case) */
238 if (s->h_count[i] > s->h_max)
239 s->h_max = s->h_count[i];
240 if (s->v_count[i] > s->v_max)
241 s->v_max = s->v_count[i];
242 s->quant_index[i] = get_bits(&s->gb, 8);
243 if (s->quant_index[i] >= 4)
244 return -1;
245 av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
246 s->v_count[i], s->component_id[i], s->quant_index[i]);
247 }
248
249 if(s->ls && (s->h_max > 1 || s->v_max > 1)) {
250 av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n");
251 return -1;
252 }
253
254 if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;
255
256 /* if different size, realloc/alloc picture */
257 /* XXX: also check h_count and v_count */
258 if (width != s->width || height != s->height) {
259 av_freep(&s->qscale_table);
260
261 s->width = width;
262 s->height = height;
263 s->interlaced = 0;
264
265 /* test interlaced mode */
266 if (s->first_picture &&
267 s->org_height != 0 &&
268 s->height < ((s->org_height * 3) / 4)) {
269 s->interlaced = 1;
270 s->bottom_field = s->interlace_polarity;
271 s->picture.interlaced_frame = 1;
272 s->picture.top_field_first = !s->interlace_polarity;
273 height *= 2;
274 }
275
276 avcodec_set_dimensions(s->avctx, width, height);
277
278 s->qscale_table= av_mallocz((s->width+15)/16);
279
280 s->first_picture = 0;
281 }
282
283 if(s->interlaced && (s->bottom_field == !s->interlace_polarity))
284 return 0;
285
286 /* XXX: not complete test ! */
287 pix_fmt_id = (s->h_count[0] << 20) | (s->v_count[0] << 16) |
288 (s->h_count[1] << 12) | (s->v_count[1] << 8) |
289 (s->h_count[2] << 4) | s->v_count[2];
290 av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
291 switch(pix_fmt_id){
292 case 0x222222:
293 case 0x111111:
294 if(s->rgb){
295 s->avctx->pix_fmt = PIX_FMT_RGB32;
296 }else if(s->nb_components==3)
297 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
298 else
299 s->avctx->pix_fmt = PIX_FMT_GRAY8;
300 break;
301 case 0x110000:
302 s->avctx->pix_fmt = PIX_FMT_GRAY8;
303 break;
304 case 0x121111:
305 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
306 break;
307 case 0x211111:
308 case 0x221212:
309 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
310 break;
311 case 0x221111:
312 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
313 break;
314 default:
315 av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
316 return -1;
317 }
318 if(s->ls){
319 if(s->nb_components > 1)
320 s->avctx->pix_fmt = PIX_FMT_RGB24;
321 else if(s->bits <= 8)
322 s->avctx->pix_fmt = PIX_FMT_GRAY8;
323 else
324 s->avctx->pix_fmt = PIX_FMT_GRAY16;
325 }
326
327 if(s->picture.data[0])
328 s->avctx->release_buffer(s->avctx, &s->picture);
329
330 s->picture.reference= 0;
331 if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
332 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
333 return -1;
334 }
335 s->picture.pict_type= FF_I_TYPE;
336 s->picture.key_frame= 1;
337
338 for(i=0; i<3; i++){
339 s->linesize[i]= s->picture.linesize[i] << s->interlaced;
340 }
341
342 // printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);
343
344 if (len != (8+(3*nb_components)))
345 {
346 av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
347 }
348
349 /* totally blank picture as progressive JPEG will only add details to it */
350 if(s->progressive){
351 memset(s->picture.data[0], 0, s->picture.linesize[0] * s->height);
352 memset(s->picture.data[1], 0, s->picture.linesize[1] * s->height >> (s->v_max - s->v_count[1]));
353 memset(s->picture.data[2], 0, s->picture.linesize[2] * s->height >> (s->v_max - s->v_count[2]));
354 }
355 return 0;
356 }
357
358 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
359 {
360 int code;
361 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
362 if (code < 0)
363 {
364 av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
365 &s->vlcs[0][dc_index]);
366 return 0xffff;
367 }
368
369 if(code)
370 return get_xbits(&s->gb, code);
371 else
372 return 0;
373 }
374
375 /* decode block and dequantize */
376 static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
377 int component, int dc_index, int ac_index, int16_t *quant_matrix)
378 {
379 int code, i, j, level, val;
380
381 /* DC coef */
382 val = mjpeg_decode_dc(s, dc_index);
383 if (val == 0xffff) {
384 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
385 return -1;
386 }
387 val = val * quant_matrix[0] + s->last_dc[component];
388 s->last_dc[component] = val;
389 block[0] = val;
390 /* AC coefs */
391 i = 0;
392 {OPEN_READER(re, &s->gb)
393 for(;;) {
394 UPDATE_CACHE(re, &s->gb);
395 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
396
397 /* EOB */
398 if (code == 0x10)
399 break;
400 i += ((unsigned)code) >> 4;
401 if(code != 0x100){
402 code &= 0xf;
403 if(code > MIN_CACHE_BITS - 16){
404 UPDATE_CACHE(re, &s->gb)
405 }
406 {
407 int cache=GET_CACHE(re,&s->gb);
408 int sign=(~cache)>>31;
409 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
410 }
411
412 LAST_SKIP_BITS(re, &s->gb, code)
413
414 if (i >= 63) {
415 if(i == 63){
416 j = s->scantable.permutated[63];
417 block[j] = level * quant_matrix[j];
418 break;
419 }
420 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
421 return -1;
422 }
423 j = s->scantable.permutated[i];
424 block[j] = level * quant_matrix[j];
425 }
426 }
427 CLOSE_READER(re, &s->gb)}
428
429 return 0;
430 }
431
432 /* decode block and dequantize - progressive JPEG version */
433 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
434 int component, int dc_index, int ac_index, int16_t *quant_matrix,
435 int ss, int se, int Ah, int Al, int *EOBRUN)
436 {
437 int code, i, j, level, val, run;
438
439 /* DC coef */
440 if(!ss){
441 val = mjpeg_decode_dc(s, dc_index);
442 if (val == 0xffff) {
443 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
444 return -1;
445 }
446 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
447 }else
448 val = 0;
449 s->last_dc[component] = val;
450 block[0] = val;
451 if(!se) return 0;
452 /* AC coefs */
453 if(*EOBRUN){
454 (*EOBRUN)--;
455 return 0;
456 }
457 {OPEN_READER(re, &s->gb)
458 for(i=ss;;i++) {
459 UPDATE_CACHE(re, &s->gb);
460 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
461 /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */
462 code -= 16;
463 if(code & 0xF) {
464 i += ((unsigned) code) >> 4;
465 code &= 0xf;
466 if(code > MIN_CACHE_BITS - 16){
467 UPDATE_CACHE(re, &s->gb)
468 }
469 {
470 int cache=GET_CACHE(re,&s->gb);
471 int sign=(~cache)>>31;
472 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
473 }
474
475 LAST_SKIP_BITS(re, &s->gb, code)
476
477 if (i >= se) {
478 if(i == se){
479 j = s->scantable.permutated[se];
480 block[j] = level * quant_matrix[j] << Al;
481 break;
482 }
483 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
484 return -1;
485 }
486 j = s->scantable.permutated[i];
487 block[j] = level * quant_matrix[j] << Al;
488 }else{
489 run = ((unsigned) code) >> 4;
490 if(run == 0xF){// ZRL - skip 15 coefficients
491 i += 15;
492 }else{
493 val = run;
494 run = (1 << run);
495 UPDATE_CACHE(re, &s->gb);
496 run += (GET_CACHE(re, &s->gb) >> (32 - val)) & (run - 1);
497 if(val)
498 LAST_SKIP_BITS(re, &s->gb, val);
499 *EOBRUN = run - 1;
500 break;
501 }
502 }
503 }
504 CLOSE_READER(re, &s->gb)}
505
506 return 0;
507 }
508
509 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
510 int i, mb_x, mb_y;
511 uint16_t buffer[32768][4];
512 int left[3], top[3], topleft[3];
513 const int linesize= s->linesize[0];
514 const int mask= (1<<s->bits)-1;
515
516 if((unsigned)s->mb_width > 32768) //dynamic alloc
517 return -1;
518
519 for(i=0; i<3; i++){
520 buffer[0][i]= 1 << (s->bits + point_transform - 1);
521 }
522 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
523 const int modified_predictor= mb_y ? predictor : 1;
524 uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
525
526 if (s->interlaced && s->bottom_field)
527 ptr += linesize >> 1;
528
529 for(i=0; i<3; i++){
530 top[i]= left[i]= topleft[i]= buffer[0][i];
531 }
532 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
533 if (s->restart_interval && !s->restart_count)
534 s->restart_count = s->restart_interval;
535
536 for(i=0;i<3;i++) {
537 int pred;
538
539 topleft[i]= top[i];
540 top[i]= buffer[mb_x][i];
541
542 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
543
544 left[i]=
545 buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
546 }
547
548 if (s->restart_interval && !--s->restart_count) {
549 align_get_bits(&s->gb);
550 skip_bits(&s->gb, 16); /* skip RSTn */
551 }
552 }
553
554 if(s->rct){
555 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
556 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
557 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
558 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
559 }
560 }else if(s->pegasus_rct){
561 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
562 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
563 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
564 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
565 }
566 }else{
567 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
568 ptr[4*mb_x+0] = buffer[mb_x][0];
569 ptr[4*mb_x+1] = buffer[mb_x][1];
570 ptr[4*mb_x+2] = buffer[mb_x][2];
571 }
572 }
573 }
574 return 0;
575 }
576
577 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
578 int i, mb_x, mb_y;
579 const int nb_components=3;
580
581 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
582 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
583 if (s->restart_interval && !s->restart_count)
584 s->restart_count = s->restart_interval;
585
586 if(mb_x==0 || mb_y==0 || s->interlaced){
587 for(i=0;i<nb_components;i++) {
588 uint8_t *ptr;
589 int n, h, v, x, y, c, j, linesize;
590 n = s->nb_blocks[i];
591 c = s->comp_index[i];
592 h = s->h_scount[i];
593 v = s->v_scount[i];
594 x = 0;
595 y = 0;
596 linesize= s->linesize[c];
597
598 for(j=0; j<n; j++) {
599 int pred;
600
601 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
602 if(y==0 && mb_y==0){
603 if(x==0 && mb_x==0){
604 pred= 128 << point_transform;
605 }else{
606 pred= ptr[-1];
607 }
608 }else{
609 if(x==0 && mb_x==0){
610 pred= ptr[-linesize];
611 }else{
612 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
613 }
614 }
615
616 if (s->interlaced && s->bottom_field)
617 ptr += linesize >> 1;
618 *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
619
620 if (++x == h) {
621 x = 0;
622 y++;
623 }
624 }
625 }
626 }else{
627 for(i=0;i<nb_components;i++) {
628 uint8_t *ptr;
629 int n, h, v, x, y, c, j, linesize;
630 n = s->nb_blocks[i];
631 c = s->comp_index[i];
632 h = s->h_scount[i];
633 v = s->v_scount[i];
634 x = 0;
635 y = 0;
636 linesize= s->linesize[c];
637
638 for(j=0; j<n; j++) {
639 int pred;
640
641 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
642 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
643 *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
644 if (++x == h) {
645 x = 0;
646 y++;
647 }
648 }
649 }
650 }
651 if (s->restart_interval && !--s->restart_count) {
652 align_get_bits(&s->gb);
653 skip_bits(&s->gb, 16); /* skip RSTn */
654 }
655 }
656 }
657 return 0;
658 }
659
660 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int ss, int se, int Ah, int Al){
661 int i, mb_x, mb_y;
662 int EOBRUN = 0;
663 uint8_t* data[MAX_COMPONENTS];
664 int linesize[MAX_COMPONENTS];
665
666 if(Ah) return 0; /* TODO decode refinement planes too */
667
668 for(i=0; i < nb_components; i++) {
669 int c = s->comp_index[i];
670 data[c] = s->picture.data[c];
671 linesize[c]=s->linesize[c];
672 if(s->avctx->codec->id==CODEC_ID_AMV) {
673 //picture should be flipped upside-down for this codec
674 assert(!(s->avctx->flags & CODEC_FLAG_EMU_EDGE));
675 data[c] += (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 ));
676 linesize[c] *= -1;
677 }
678 }
679
680 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
681 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
682 if (s->restart_interval && !s->restart_count)
683 s->restart_count = s->restart_interval;
684
685 for(i=0;i<nb_components;i++) {
686 uint8_t *ptr;
687 int n, h, v, x, y, c, j;
688 n = s->nb_blocks[i];
689 c = s->comp_index[i];
690 h = s->h_scount[i];
691 v = s->v_scount[i];
692 x = 0;
693 y = 0;
694 for(j=0;j<n;j++) {
695 memset(s->block, 0, sizeof(s->block));
696 if (!s->progressive && decode_block(s, s->block, i,
697 s->dc_index[i], s->ac_index[i],
698 s->quant_matrixes[ s->quant_index[c] ]) < 0) {
699 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
700 return -1;
701 }
702 if (s->progressive && decode_block_progressive(s, s->block, i,
703 s->dc_index[i], s->ac_index[i],
704 s->quant_matrixes[ s->quant_index[c] ], ss, se, Ah, Al, &EOBRUN) < 0) {
705 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
706 return -1;
707 }
708 // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
709 ptr = data[c] +
710 (((linesize[c] * (v * mb_y + y) * 8) +
711 (h * mb_x + x) * 8) >> s->avctx->lowres);
712 if (s->interlaced && s->bottom_field)
713 ptr += linesize[c] >> 1;
714 //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);
715 if(!s->progressive)
716 s->dsp.idct_put(ptr, linesize[c], s->block);
717 else
718 s->dsp.idct_add(ptr, linesize[c], s->block);
719 if (++x == h) {
720 x = 0;
721 y++;
722 }
723 }
724 }
725 /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */
726 if (s->restart_interval && (s->restart_interval < 1350) &&
727 !--s->restart_count) {
728 align_get_bits(&s->gb);
729 skip_bits(&s->gb, 16); /* skip RSTn */
730 for (i=0; i<nb_components; i++) /* reset dc */
731 s->last_dc[i] = 1024;
732 }
733 }
734 }
735 return 0;
736 }
737
738 int ff_mjpeg_decode_sos(MJpegDecodeContext *s)
739 {
740 int len, nb_components, i, h, v, predictor, point_transform;
741 int vmax, hmax, index, id;
742 const int block_size= s->lossless ? 1 : 8;
743 int ilv, prev_shift;
744
745 /* XXX: verify len field validity */
746 len = get_bits(&s->gb, 16);
747 nb_components = get_bits(&s->gb, 8);
748 if (len != 6+2*nb_components)
749 {
750 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
751 return -1;
752 }
753 vmax = 0;
754 hmax = 0;
755 for(i=0;i<nb_components;i++) {
756 id = get_bits(&s->gb, 8) - 1;
757 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
758 /* find component index */
759 for(index=0;index<s->nb_components;index++)
760 if (id == s->component_id[index])
761 break;
762 if (index == s->nb_components)
763 {
764 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index);
765 return -1;
766 }
767
768 s->comp_index[i] = index;
769
770 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
771 s->h_scount[i] = s->h_count[index];
772 s->v_scount[i] = s->v_count[index];
773
774 s->dc_index[i] = get_bits(&s->gb, 4);
775 s->ac_index[i] = get_bits(&s->gb, 4);
776
777 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
778 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
779 goto out_of_range;
780 #if 0 //buggy
781 switch(s->start_code)
782 {
783 case SOF0:
784 if (dc_index[i] > 1 || ac_index[i] > 1)
785 goto out_of_range;
786 break;
787 case SOF1:
788 case SOF2:
789 if (dc_index[i] > 3 || ac_index[i] > 3)
790 goto out_of_range;
791 break;
792 case SOF3:
793 if (dc_index[i] > 3 || ac_index[i] != 0)
794 goto out_of_range;
795 break;
796 }
797 #endif
798 }
799
800 predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
801 ilv= get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
802 prev_shift = get_bits(&s->gb, 4); /* Ah */
803 point_transform= get_bits(&s->gb, 4); /* Al */
804
805 for(i=0;i<nb_components;i++)
806 s->last_dc[i] = 1024;
807
808 if (nb_components > 1) {
809 /* interleaved stream */
810 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
811 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
812 } else if(!s->ls) { /* skip this for JPEG-LS */
813 h = s->h_max / s->h_scount[0];
814 v = s->v_max / s->v_scount[0];
815 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
816 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
817 s->nb_blocks[0] = 1;
818 s->h_scount[0] = 1;
819 s->v_scount[0] = 1;
820 }
821
822 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
823 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" : "",
824 predictor, point_transform, ilv, s->bits,
825 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
826
827
828 /* mjpeg-b can have padding bytes between sos and image data, skip them */
829 for (i = s->mjpb_skiptosod; i > 0; i--)
830 skip_bits(&s->gb, 8);
831
832 if(s->lossless){
833 if(ENABLE_JPEGLS_DECODER && s->ls){
834 // for(){
835 // reset_ls_coding_parameters(s, 0);
836
837 ff_jpegls_decode_picture(s, predictor, point_transform, ilv);
838 }else{
839 if(s->rgb){
840 if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
841 return -1;
842 }else{
843 if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
844 return -1;
845 }
846 }
847 }else{
848 if(mjpeg_decode_scan(s, nb_components, predictor, ilv, prev_shift, point_transform) < 0)
849 return -1;
850 }
851 emms_c();
852 return 0;
853 out_of_range:
854 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
855 return -1;
856 }
857
858 static int mjpeg_decode_dri(MJpegDecodeContext *s)
859 {
860 if (get_bits(&s->gb, 16) != 4)
861 return -1;
862 s->restart_interval = get_bits(&s->gb, 16);
863 s->restart_count = 0;
864 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);
865
866 return 0;
867 }
868
869 static int mjpeg_decode_app(MJpegDecodeContext *s)
870 {
871 int len, id, i;
872
873 len = get_bits(&s->gb, 16);
874 if (len < 5)
875 return -1;
876 if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)
877 return -1;
878
879 id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
880 id = be2me_32(id);
881 len -= 6;
882
883 if(s->avctx->debug & FF_DEBUG_STARTCODE){
884 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
885 }
886
887 /* buggy AVID, it puts EOI only at every 10th frame */
888 /* also this fourcc is used by non-avid files too, it holds some
889 informations, but it's always present in AVID creates files */
890 if (id == ff_get_fourcc("AVI1"))
891 {
892 /* structure:
893 4bytes AVI1
894 1bytes polarity
895 1bytes always zero
896 4bytes field_size
897 4bytes field_size_less_padding
898 */
899 s->buggy_avid = 1;
900 // if (s->first_picture)
901 // printf("mjpeg: workarounding buggy AVID\n");
902 i = get_bits(&s->gb, 8);
903 if (i==2) s->bottom_field= 1;
904 else if(i==1) s->bottom_field= 0;
905 #if 0
906 skip_bits(&s->gb, 8);
907 skip_bits(&s->gb, 32);
908 skip_bits(&s->gb, 32);
909 len -= 10;
910 #endif
911 // if (s->interlace_polarity)
912 // printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
913 goto out;
914 }
915
916 // len -= 2;
917
918 if (id == ff_get_fourcc("JFIF"))
919 {
920 int t_w, t_h, v1, v2;
921 skip_bits(&s->gb, 8); /* the trailing zero-byte */
922 v1= get_bits(&s->gb, 8);
923 v2= get_bits(&s->gb, 8);
924 skip_bits(&s->gb, 8);
925
926 s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
927 s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
928
929 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
930 av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
931 v1, v2,
932 s->avctx->sample_aspect_ratio.num,
933 s->avctx->sample_aspect_ratio.den
934 );
935
936 t_w = get_bits(&s->gb, 8);
937 t_h = get_bits(&s->gb, 8);
938 if (t_w && t_h)
939 {
940 /* skip thumbnail */
941 if (len-10-(t_w*t_h*3) > 0)
942 len -= t_w*t_h*3;
943 }
944 len -= 10;
945 goto out;
946 }
947
948 if (id == ff_get_fourcc("Adob") && (get_bits(&s->gb, 8) == 'e'))
949 {
950 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
951 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
952 skip_bits(&s->gb, 16); /* version */
953 skip_bits(&s->gb, 16); /* flags0 */
954 skip_bits(&s->gb, 16); /* flags1 */
955 skip_bits(&s->gb, 8); /* transform */
956 len -= 7;
957 goto out;
958 }
959
960 if (id == ff_get_fourcc("LJIF")){
961 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
962 av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");
963 skip_bits(&s->gb, 16); /* version ? */
964 skip_bits(&s->gb, 16); /* unknwon always 0? */
965 skip_bits(&s->gb, 16); /* unknwon always 0? */
966 skip_bits(&s->gb, 16); /* unknwon always 0? */
967 switch( get_bits(&s->gb, 8)){
968 case 1:
969 s->rgb= 1;
970 s->pegasus_rct=0;
971 break;
972 case 2:
973 s->rgb= 1;
974 s->pegasus_rct=1;
975 break;
976 default:
977 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
978 }
979 len -= 9;
980 goto out;
981 }
982
983 /* Apple MJPEG-A */
984 if ((s->start_code == APP1) && (len > (0x28 - 8)))
985 {
986 id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
987 id = be2me_32(id);
988 len -= 4;
989 if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */
990 {
991 #if 0
992 skip_bits(&s->gb, 32); /* field size */
993 skip_bits(&s->gb, 32); /* pad field size */
994 skip_bits(&s->gb, 32); /* next off */
995 skip_bits(&s->gb, 32); /* quant off */
996 skip_bits(&s->gb, 32); /* huff off */
997 skip_bits(&s->gb, 32); /* image off */
998 skip_bits(&s->gb, 32); /* scan off */
999 skip_bits(&s->gb, 32); /* data off */
1000 #endif
1001 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1002 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1003 }
1004 }
1005
1006 out:
1007 /* slow but needed for extreme adobe jpegs */
1008 if (len < 0)
1009 av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");
1010 while(--len > 0)
1011 skip_bits(&s->gb, 8);
1012
1013 return 0;
1014 }
1015
1016 static int mjpeg_decode_com(MJpegDecodeContext *s)
1017 {
1018 int len = get_bits(&s->gb, 16);
1019 if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
1020 char *cbuf = av_malloc(len - 1);
1021 if (cbuf) {
1022 int i;
1023 for (i = 0; i < len - 2; i++)
1024 cbuf[i] = get_bits(&s->gb, 8);
1025 if (i > 0 && cbuf[i-1] == '\n')
1026 cbuf[i-1] = 0;
1027 else
1028 cbuf[i] = 0;
1029
1030 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1031 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1032
1033 /* buggy avid, it puts EOI only at every 10th frame */
1034 if (!strcmp(cbuf, "AVID"))
1035 {
1036 s->buggy_avid = 1;
1037 // if (s->first_picture)
1038 // printf("mjpeg: workarounding buggy AVID\n");
1039 }
1040 else if(!strcmp(cbuf, "CS=ITU601")){
1041 s->cs_itu601= 1;
1042 }
1043
1044 av_free(cbuf);
1045 }
1046 }
1047
1048 return 0;
1049 }
1050
1051 #if 0
1052 static int valid_marker_list[] =
1053 {
1054 /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
1055 /* 0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1056 /* 1 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1057 /* 2 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1058 /* 3 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1059 /* 4 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1060 /* 5 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1061 /* 6 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1062 /* 7 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1063 /* 8 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1064 /* 9 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1065 /* a */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1066 /* b */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1067 /* c */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1068 /* d */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1069 /* e */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1070 /* f */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
1071 }
1072 #endif
1073
1074 /* return the 8 bit start code value and update the search
1075 state. Return -1 if no start code found */
1076 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1077 {
1078 const uint8_t *buf_ptr;
1079 unsigned int v, v2;
1080 int val;
1081 #ifdef DEBUG
1082 int skipped=0;
1083 #endif
1084
1085 buf_ptr = *pbuf_ptr;
1086 while (buf_ptr < buf_end) {
1087 v = *buf_ptr++;
1088 v2 = *buf_ptr;
1089 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1090 val = *buf_ptr++;
1091 goto found;
1092 }
1093 #ifdef DEBUG
1094 skipped++;
1095 #endif
1096 }
1097 val = -1;
1098 found:
1099 #ifdef DEBUG
1100 av_log(NULL, AV_LOG_VERBOSE, "find_marker skipped %d bytes\n", skipped);
1101 #endif
1102 *pbuf_ptr = buf_ptr;
1103 return val;
1104 }
1105
1106 int ff_mjpeg_decode_frame(AVCodecContext *avctx,
1107 void *data, int *data_size,
1108 const uint8_t *buf, int buf_size)
1109 {
1110 MJpegDecodeContext *s = avctx->priv_data;
1111 const uint8_t *buf_end, *buf_ptr;
1112 int start_code;
1113 AVFrame *picture = data;
1114
1115 buf_ptr = buf;
1116 buf_end = buf + buf_size;
1117 while (buf_ptr < buf_end) {
1118 /* find start next marker */
1119 start_code = find_marker(&buf_ptr, buf_end);
1120 {
1121 /* EOF */
1122 if (start_code < 0) {
1123 goto the_end;
1124 } else {
1125 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);
1126
1127 if ((buf_end - buf_ptr) > s->buffer_size)
1128 {
1129 av_free(s->buffer);
1130 s->buffer_size = buf_end-buf_ptr;
1131 s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
1132 av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
1133 s->buffer_size);
1134 }
1135
1136 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1137 if (start_code == SOS && !s->ls)
1138 {
1139 const uint8_t *src = buf_ptr;
1140 uint8_t *dst = s->buffer;
1141
1142 while (src<buf_end)
1143 {
1144 uint8_t x = *(src++);
1145
1146 *(dst++) = x;
1147 if (avctx->codec_id != CODEC_ID_THP)
1148 {
1149 if (x == 0xff) {
1150 while (src < buf_end && x == 0xff)
1151 x = *(src++);
1152
1153 if (x >= 0xd0 && x <= 0xd7)
1154 *(dst++) = x;
1155 else if (x)
1156 break;
1157 }
1158 }
1159 }
1160 init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);
1161
1162 av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1163 (buf_end - buf_ptr) - (dst - s->buffer));
1164 }
1165 else if(start_code == SOS && s->ls){
1166 const uint8_t *src = buf_ptr;
1167 uint8_t *dst = s->buffer;
1168 int bit_count = 0;
1169 int t = 0, b = 0;
1170 PutBitContext pb;
1171
1172 s->cur_scan++;
1173
1174 /* find marker */
1175 while (src + t < buf_end){
1176 uint8_t x = src[t++];
1177 if (x == 0xff){
1178 while((src + t < buf_end) && x == 0xff)
1179 x = src[t++];
1180 if (x & 0x80) {
1181 t -= 2;
1182 break;
1183 }
1184 }
1185 }
1186 bit_count = t * 8;
1187
1188 init_put_bits(&pb, dst, t);
1189
1190 /* unescape bitstream */
1191 while(b < t){
1192 uint8_t x = src[b++];
1193 put_bits(&pb, 8, x);
1194 if(x == 0xFF){
1195 x = src[b++];
1196 put_bits(&pb, 7, x);
1197 bit_count--;
1198 }
1199 }
1200 flush_put_bits(&pb);
1201
1202 init_get_bits(&s->gb, dst, bit_count);
1203 }
1204 else
1205 init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);
1206
1207 s->start_code = start_code;
1208 if(s->avctx->debug & FF_DEBUG_STARTCODE){
1209 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1210 }
1211
1212 /* process markers */
1213 if (start_code >= 0xd0 && start_code <= 0xd7) {
1214 av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);
1215 /* APP fields */
1216 } else if (start_code >= APP0 && start_code <= APP15) {
1217 mjpeg_decode_app(s);
1218 /* Comment */
1219 } else if (start_code == COM){
1220 mjpeg_decode_com(s);
1221 }
1222
1223 switch(start_code) {
1224 case SOI:
1225 s->restart_interval = 0;
1226
1227 s->restart_count = 0;
1228 /* nothing to do on SOI */
1229 break;
1230 case DQT:
1231 ff_mjpeg_decode_dqt(s);
1232 break;
1233 case DHT:
1234 if(ff_mjpeg_decode_dht(s) < 0){
1235 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1236 return -1;
1237 }
1238 break;
1239 case SOF0:
1240 s->lossless=0;
1241 s->ls=0;
1242 s->progressive=0;
1243 if (ff_mjpeg_decode_sof(s) < 0)
1244 return -1;
1245 break;
1246 case SOF2:
1247 s->lossless=0;
1248 s->ls=0;
1249 s->progressive=1;
1250 if (ff_mjpeg_decode_sof(s) < 0)
1251 return -1;
1252 break;
1253 case SOF3:
1254 s->lossless=1;
1255 s->ls=0;
1256 s->progressive=0;
1257 if (ff_mjpeg_decode_sof(s) < 0)
1258 return -1;
1259 break;
1260 case SOF48:
1261 s->lossless=1;
1262 s->ls=1;
1263 s->progressive=0;
1264 if (ff_mjpeg_decode_sof(s) < 0)
1265 return -1;
1266 break;
1267 case LSE:
1268 if (!ENABLE_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
1269 return -1;
1270 break;
1271 case EOI:
1272 s->cur_scan = 0;
1273 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1274 break;
1275 eoi_parser:
1276 {
1277 if (s->interlaced) {
1278 s->bottom_field ^= 1;
1279 /* if not bottom field, do not output image yet */
1280 if (s->bottom_field == !s->interlace_polarity)
1281 goto not_the_end;
1282 }
1283 *picture = s->picture;
1284 *data_size = sizeof(AVFrame);
1285
1286 if(!s->lossless){
1287 picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);
1288 picture->qstride= 0;
1289 picture->qscale_table= s->qscale_table;
1290 memset(picture->qscale_table, picture->quality, (s->width+15)/16);
1291 if(avctx->debug & FF_DEBUG_QP)
1292 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
1293 picture->quality*= FF_QP2LAMBDA;
1294 }
1295
1296 goto the_end;
1297 }
1298 break;
1299 case SOS:
1300 ff_mjpeg_decode_sos(s);
1301 /* buggy avid puts EOI every 10-20th frame */
1302 /* if restart period is over process EOI */
1303 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1304 goto eoi_parser;
1305 break;
1306 case DRI:
1307 mjpeg_decode_dri(s);
1308 break;
1309 case SOF1:
1310 case SOF5:
1311 case SOF6:
1312 case SOF7:
1313 case SOF9:
1314 case SOF10:
1315 case SOF11:
1316 case SOF13:
1317 case SOF14:
1318 case SOF15:
1319 case JPG:
1320 av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);
1321 break;
1322 // default:
1323 // printf("mjpeg: unsupported marker (%x)\n", start_code);
1324 // break;
1325 }
1326
1327 not_the_end:
1328 /* eof process start code */
1329 buf_ptr += (get_bits_count(&s->gb)+7)/8;
1330 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",
1331 (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
1332 }
1333 }
1334 }
1335 the_end:
1336 av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);
1337 // return buf_end - buf_ptr;
1338 return buf_ptr - buf;
1339 }
1340
1341 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1342 {
1343 MJpegDecodeContext *s = avctx->priv_data;
1344 int i, j;
1345
1346 av_free(s->buffer);
1347 av_free(s->qscale_table);
1348
1349 for(i=0;i<2;i++) {
1350 for(j=0;j<4;j++)
1351 free_vlc(&s->vlcs[i][j]);
1352 }
1353 return 0;
1354 }
1355
1356 AVCodec mjpeg_decoder = {
1357 "mjpeg",
1358 CODEC_TYPE_VIDEO,
1359 CODEC_ID_MJPEG,
1360 sizeof(MJpegDecodeContext),
1361 ff_mjpeg_decode_init,
1362 NULL,
1363 ff_mjpeg_decode_end,
1364 ff_mjpeg_decode_frame,
1365 CODEC_CAP_DR1,
1366 NULL,
1367 .long_name = "MJPEG (Motion JPEG)",
1368 };
1369
1370 AVCodec thp_decoder = {
1371 "thp",
1372 CODEC_TYPE_VIDEO,
1373 CODEC_ID_THP,
1374 sizeof(MJpegDecodeContext),
1375 ff_mjpeg_decode_init,
1376 NULL,
1377 ff_mjpeg_decode_end,
1378 ff_mjpeg_decode_frame,
1379 CODEC_CAP_DR1,
1380 NULL,
1381 .long_name = "Nintendo Gamecube THP video",
1382 };
An experimental fork of FFmpeg project for DVCPRO-HD developers