3 * Copyright (c) 2000, 2001 Fabrice Bellard.
4 * Copyright (c) 2003 Alex Beregszaszi
5 * Copyright (c) 2003-2004 Michael Niedermayer
7 * Support for external huffman table, various fixes (AVID workaround),
8 * aspecting, new decode_frame mechanism and apple mjpeg-b support
11 * This file is part of FFmpeg.
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.
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.
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
40 #include "jpeglsdec.h"
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)
46 uint8_t huff_size[256+16];
47 uint16_t huff_code[256+16];
49 assert(nb_codes <= 256);
51 memset(huff_size, 0, sizeof(huff_size));
52 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
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);
62 return init_vlc(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, use_static);
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);
76 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
78 MJpegDecodeContext *s = avctx->priv_data;
81 dsputil_init(&s->dsp, avctx);
82 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
87 s->org_height = avctx->coded_height;
89 build_basic_mjpeg_vlc(s);
91 if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
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);
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");
112 /* quantize tables */
113 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
115 int len, index, i, j;
117 len = get_bits(&s->gb, 16) - 2;
120 /* only 8 bit precision handled */
121 if (get_bits(&s->gb, 4) != 0)
123 av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
126 index = get_bits(&s->gb, 4);
129 av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
130 /* read quant table */
132 j = s->scantable.permutated[i];
133 s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
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]);
147 /* decode huffman tables and build VLC decoders */
148 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
150 int len, index, i, class, n, v, code_max;
151 uint8_t bits_table[17];
152 uint8_t val_table[256];
154 len = get_bits(&s->gb, 16) - 2;
159 class = get_bits(&s->gb, 4);
162 index = get_bits(&s->gb, 4);
167 bits_table[i] = get_bits(&s->gb, 8);
171 if (len < n || n > 256)
176 v = get_bits(&s->gb, 8);
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){
194 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
196 int len, nb_components, i, width, height, pix_fmt_id;
198 /* XXX: verify len field validity */
199 len = get_bits(&s->gb, 16);
200 s->bits= get_bits(&s->gb, 8);
202 if(s->pegasus_rct) s->bits=9;
203 if(s->bits==9 && !s->pegasus_rct) s->rct=1; //FIXME ugly
205 if (s->bits != 8 && !s->lossless){
206 av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
210 height = get_bits(&s->gb, 16);
211 width = get_bits(&s->gb, 16);
213 //HACK for odd_height.mov
214 if(s->interlaced && s->width == width && s->height == height + 1)
217 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
218 if(avcodec_check_dimensions(s->avctx, width, height))
221 nb_components = get_bits(&s->gb, 8);
222 if (nb_components <= 0 ||
223 nb_components > MAX_COMPONENTS)
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");
229 s->nb_components = nb_components;
232 for(i=0;i<nb_components;i++) {
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)
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]);
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");
254 if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;
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);
265 /* test interlaced mode */
266 if (s->first_picture &&
267 s->org_height != 0 &&
268 s->height < ((s->org_height * 3) / 4)) {
270 s->bottom_field = s->interlace_polarity;
271 s->picture.interlaced_frame = 1;
272 s->picture.top_field_first = !s->interlace_polarity;
276 avcodec_set_dimensions(s->avctx, width, height);
278 s->qscale_table= av_mallocz((s->width+15)/16);
280 s->first_picture = 0;
283 if(s->interlaced && (s->bottom_field == !s->interlace_polarity))
286 /* XXX: not complete test ! */
287 pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
288 (s->h_count[1] << 20) | (s->v_count[1] << 16) |
289 (s->h_count[2] << 12) | (s->v_count[2] << 8) |
290 (s->h_count[3] << 4) | s->v_count[3];
291 av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
292 if(!(pix_fmt_id & 0x10101010))
293 pix_fmt_id-= (pix_fmt_id & 0xF0F0F0F0)>>1;
294 if(!(pix_fmt_id & 0x01010101))
295 pix_fmt_id-= (pix_fmt_id & 0x0F0F0F0F)>>1;
300 s->avctx->pix_fmt = PIX_FMT_RGB32;
302 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
303 assert(s->nb_components==3);
306 s->avctx->pix_fmt = PIX_FMT_GRAY8;
309 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
312 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
315 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
318 av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
322 if(s->nb_components > 1)
323 s->avctx->pix_fmt = PIX_FMT_RGB24;
324 else if(s->bits <= 8)
325 s->avctx->pix_fmt = PIX_FMT_GRAY8;
327 s->avctx->pix_fmt = PIX_FMT_GRAY16;
330 if(s->picture.data[0])
331 s->avctx->release_buffer(s->avctx, &s->picture);
333 s->picture.reference= 0;
334 if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
335 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
338 s->picture.pict_type= FF_I_TYPE;
339 s->picture.key_frame= 1;
342 s->linesize[i]= s->picture.linesize[i] << s->interlaced;
345 // printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);
347 if (len != (8+(3*nb_components)))
349 av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
352 /* totally blank picture as progressive JPEG will only add details to it */
354 memset(s->picture.data[0], 0, s->picture.linesize[0] * s->height);
355 memset(s->picture.data[1], 0, s->picture.linesize[1] * s->height >> (s->v_max - s->v_count[1]));
356 memset(s->picture.data[2], 0, s->picture.linesize[2] * s->height >> (s->v_max - s->v_count[2]));
361 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
364 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
367 av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
368 &s->vlcs[0][dc_index]);
373 return get_xbits(&s->gb, code);
378 /* decode block and dequantize */
379 static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
380 int component, int dc_index, int ac_index, int16_t *quant_matrix)
382 int code, i, j, level, val;
385 val = mjpeg_decode_dc(s, dc_index);
387 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
390 val = val * quant_matrix[0] + s->last_dc[component];
391 s->last_dc[component] = val;
395 {OPEN_READER(re, &s->gb)
397 UPDATE_CACHE(re, &s->gb);
398 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
403 i += ((unsigned)code) >> 4;
406 if(code > MIN_CACHE_BITS - 16){
407 UPDATE_CACHE(re, &s->gb)
410 int cache=GET_CACHE(re,&s->gb);
411 int sign=(~cache)>>31;
412 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
415 LAST_SKIP_BITS(re, &s->gb, code)
419 j = s->scantable.permutated[63];
420 block[j] = level * quant_matrix[j];
423 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
426 j = s->scantable.permutated[i];
427 block[j] = level * quant_matrix[j];
430 CLOSE_READER(re, &s->gb)}
435 /* decode block and dequantize - progressive JPEG version */
436 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
437 int component, int dc_index, int ac_index, int16_t *quant_matrix,
438 int ss, int se, int Ah, int Al, int *EOBRUN)
440 int code, i, j, level, val, run;
444 val = mjpeg_decode_dc(s, dc_index);
446 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
449 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
452 s->last_dc[component] = val;
460 {OPEN_READER(re, &s->gb)
462 UPDATE_CACHE(re, &s->gb);
463 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
464 /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */
467 i += ((unsigned) code) >> 4;
469 if(code > MIN_CACHE_BITS - 16){
470 UPDATE_CACHE(re, &s->gb)
473 int cache=GET_CACHE(re,&s->gb);
474 int sign=(~cache)>>31;
475 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
478 LAST_SKIP_BITS(re, &s->gb, code)
482 j = s->scantable.permutated[se];
483 block[j] = level * quant_matrix[j] << Al;
486 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
489 j = s->scantable.permutated[i];
490 block[j] = level * quant_matrix[j] << Al;
492 run = ((unsigned) code) >> 4;
493 if(run == 0xF){// ZRL - skip 15 coefficients
498 UPDATE_CACHE(re, &s->gb);
499 run += (GET_CACHE(re, &s->gb) >> (32 - val)) & (run - 1);
501 LAST_SKIP_BITS(re, &s->gb, val);
507 CLOSE_READER(re, &s->gb)}
512 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
514 uint16_t buffer[32768][4];
515 int left[3], top[3], topleft[3];
516 const int linesize= s->linesize[0];
517 const int mask= (1<<s->bits)-1;
519 if((unsigned)s->mb_width > 32768) //dynamic alloc
523 buffer[0][i]= 1 << (s->bits + point_transform - 1);
525 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
526 const int modified_predictor= mb_y ? predictor : 1;
527 uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
529 if (s->interlaced && s->bottom_field)
530 ptr += linesize >> 1;
533 top[i]= left[i]= topleft[i]= buffer[0][i];
535 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
536 if (s->restart_interval && !s->restart_count)
537 s->restart_count = s->restart_interval;
543 top[i]= buffer[mb_x][i];
545 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
548 buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
551 if (s->restart_interval && !--s->restart_count) {
552 align_get_bits(&s->gb);
553 skip_bits(&s->gb, 16); /* skip RSTn */
558 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
559 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
560 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
561 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
563 }else if(s->pegasus_rct){
564 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
565 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
566 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
567 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
570 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
571 ptr[4*mb_x+0] = buffer[mb_x][0];
572 ptr[4*mb_x+1] = buffer[mb_x][1];
573 ptr[4*mb_x+2] = buffer[mb_x][2];
580 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
582 const int nb_components=3;
584 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
585 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
586 if (s->restart_interval && !s->restart_count)
587 s->restart_count = s->restart_interval;
589 if(mb_x==0 || mb_y==0 || s->interlaced){
590 for(i=0;i<nb_components;i++) {
592 int n, h, v, x, y, c, j, linesize;
594 c = s->comp_index[i];
599 linesize= s->linesize[c];
604 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
607 pred= 128 << point_transform;
613 pred= ptr[-linesize];
615 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
619 if (s->interlaced && s->bottom_field)
620 ptr += linesize >> 1;
621 *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
630 for(i=0;i<nb_components;i++) {
632 int n, h, v, x, y, c, j, linesize;
634 c = s->comp_index[i];
639 linesize= s->linesize[c];
644 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
645 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
646 *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
654 if (s->restart_interval && !--s->restart_count) {
655 align_get_bits(&s->gb);
656 skip_bits(&s->gb, 16); /* skip RSTn */
663 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int ss, int se, int Ah, int Al){
666 uint8_t* data[MAX_COMPONENTS];
667 int linesize[MAX_COMPONENTS];
669 if(Ah) return 0; /* TODO decode refinement planes too */
671 for(i=0; i < nb_components; i++) {
672 int c = s->comp_index[i];
673 data[c] = s->picture.data[c];
674 linesize[c]=s->linesize[c];
675 if(s->avctx->codec->id==CODEC_ID_AMV) {
676 //picture should be flipped upside-down for this codec
677 assert(!(s->avctx->flags & CODEC_FLAG_EMU_EDGE));
678 data[c] += (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 ));
683 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
684 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
685 if (s->restart_interval && !s->restart_count)
686 s->restart_count = s->restart_interval;
688 for(i=0;i<nb_components;i++) {
690 int n, h, v, x, y, c, j;
692 c = s->comp_index[i];
698 memset(s->block, 0, sizeof(s->block));
699 if (!s->progressive && decode_block(s, s->block, i,
700 s->dc_index[i], s->ac_index[i],
701 s->quant_matrixes[ s->quant_index[c] ]) < 0) {
702 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
705 if (s->progressive && decode_block_progressive(s, s->block, i,
706 s->dc_index[i], s->ac_index[i],
707 s->quant_matrixes[ s->quant_index[c] ], ss, se, Ah, Al, &EOBRUN) < 0) {
708 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
711 // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
713 (((linesize[c] * (v * mb_y + y) * 8) +
714 (h * mb_x + x) * 8) >> s->avctx->lowres);
715 if (s->interlaced && s->bottom_field)
716 ptr += linesize[c] >> 1;
717 //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);
719 s->dsp.idct_put(ptr, linesize[c], s->block);
721 s->dsp.idct_add(ptr, linesize[c], s->block);
728 /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */
729 if (s->restart_interval && (s->restart_interval < 1350) &&
730 !--s->restart_count) {
731 align_get_bits(&s->gb);
732 skip_bits(&s->gb, 16); /* skip RSTn */
733 for (i=0; i<nb_components; i++) /* reset dc */
734 s->last_dc[i] = 1024;
741 int ff_mjpeg_decode_sos(MJpegDecodeContext *s)
743 int len, nb_components, i, h, v, predictor, point_transform;
744 int vmax, hmax, index, id;
745 const int block_size= s->lossless ? 1 : 8;
748 /* XXX: verify len field validity */
749 len = get_bits(&s->gb, 16);
750 nb_components = get_bits(&s->gb, 8);
751 if (len != 6+2*nb_components)
753 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
758 for(i=0;i<nb_components;i++) {
759 id = get_bits(&s->gb, 8) - 1;
760 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
761 /* find component index */
762 for(index=0;index<s->nb_components;index++)
763 if (id == s->component_id[index])
765 if (index == s->nb_components)
767 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index);
771 s->comp_index[i] = index;
773 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
774 s->h_scount[i] = s->h_count[index];
775 s->v_scount[i] = s->v_count[index];
777 s->dc_index[i] = get_bits(&s->gb, 4);
778 s->ac_index[i] = get_bits(&s->gb, 4);
780 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
781 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
784 switch(s->start_code)
787 if (dc_index[i] > 1 || ac_index[i] > 1)
792 if (dc_index[i] > 3 || ac_index[i] > 3)
796 if (dc_index[i] > 3 || ac_index[i] != 0)
803 predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
804 ilv= get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
805 prev_shift = get_bits(&s->gb, 4); /* Ah */
806 point_transform= get_bits(&s->gb, 4); /* Al */
808 for(i=0;i<nb_components;i++)
809 s->last_dc[i] = 1024;
811 if (nb_components > 1) {
812 /* interleaved stream */
813 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
814 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
815 } else if(!s->ls) { /* skip this for JPEG-LS */
816 h = s->h_max / s->h_scount[0];
817 v = s->v_max / s->v_scount[0];
818 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
819 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
825 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
826 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" : "",
827 predictor, point_transform, ilv, s->bits,
828 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
831 /* mjpeg-b can have padding bytes between sos and image data, skip them */
832 for (i = s->mjpb_skiptosod; i > 0; i--)
833 skip_bits(&s->gb, 8);
836 if(ENABLE_JPEGLS_DECODER && s->ls){
838 // reset_ls_coding_parameters(s, 0);
840 if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
844 if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
847 if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
852 if(mjpeg_decode_scan(s, nb_components, predictor, ilv, prev_shift, point_transform) < 0)
858 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
862 static int mjpeg_decode_dri(MJpegDecodeContext *s)
864 if (get_bits(&s->gb, 16) != 4)
866 s->restart_interval = get_bits(&s->gb, 16);
867 s->restart_count = 0;
868 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);
873 static int mjpeg_decode_app(MJpegDecodeContext *s)
877 len = get_bits(&s->gb, 16);
880 if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)
883 id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
887 if(s->avctx->debug & FF_DEBUG_STARTCODE){
888 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
891 /* buggy AVID, it puts EOI only at every 10th frame */
892 /* also this fourcc is used by non-avid files too, it holds some
893 informations, but it's always present in AVID creates files */
894 if (id == ff_get_fourcc("AVI1"))
901 4bytes field_size_less_padding
904 // if (s->first_picture)
905 // printf("mjpeg: workarounding buggy AVID\n");
906 i = get_bits(&s->gb, 8);
907 if (i==2) s->bottom_field= 1;
908 else if(i==1) s->bottom_field= 0;
910 skip_bits(&s->gb, 8);
911 skip_bits(&s->gb, 32);
912 skip_bits(&s->gb, 32);
915 // if (s->interlace_polarity)
916 // printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
922 if (id == ff_get_fourcc("JFIF"))
924 int t_w, t_h, v1, v2;
925 skip_bits(&s->gb, 8); /* the trailing zero-byte */
926 v1= get_bits(&s->gb, 8);
927 v2= get_bits(&s->gb, 8);
928 skip_bits(&s->gb, 8);
930 s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
931 s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
933 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
934 av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
936 s->avctx->sample_aspect_ratio.num,
937 s->avctx->sample_aspect_ratio.den
940 t_w = get_bits(&s->gb, 8);
941 t_h = get_bits(&s->gb, 8);
945 if (len-10-(t_w*t_h*3) > 0)
952 if (id == ff_get_fourcc("Adob") && (get_bits(&s->gb, 8) == 'e'))
954 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
955 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
956 skip_bits(&s->gb, 16); /* version */
957 skip_bits(&s->gb, 16); /* flags0 */
958 skip_bits(&s->gb, 16); /* flags1 */
959 skip_bits(&s->gb, 8); /* transform */
964 if (id == ff_get_fourcc("LJIF")){
965 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
966 av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");
967 skip_bits(&s->gb, 16); /* version ? */
968 skip_bits(&s->gb, 16); /* unknwon always 0? */
969 skip_bits(&s->gb, 16); /* unknwon always 0? */
970 skip_bits(&s->gb, 16); /* unknwon always 0? */
971 switch( get_bits(&s->gb, 8)){
981 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
988 if ((s->start_code == APP1) && (len > (0x28 - 8)))
990 id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
993 if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */
996 skip_bits(&s->gb, 32); /* field size */
997 skip_bits(&s->gb, 32); /* pad field size */
998 skip_bits(&s->gb, 32); /* next off */
999 skip_bits(&s->gb, 32); /* quant off */
1000 skip_bits(&s->gb, 32); /* huff off */
1001 skip_bits(&s->gb, 32); /* image off */
1002 skip_bits(&s->gb, 32); /* scan off */
1003 skip_bits(&s->gb, 32); /* data off */
1005 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1006 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1011 /* slow but needed for extreme adobe jpegs */
1013 av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");
1015 skip_bits(&s->gb, 8);
1020 static int mjpeg_decode_com(MJpegDecodeContext *s)
1022 int len = get_bits(&s->gb, 16);
1023 if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
1024 char *cbuf = av_malloc(len - 1);
1027 for (i = 0; i < len - 2; i++)
1028 cbuf[i] = get_bits(&s->gb, 8);
1029 if (i > 0 && cbuf[i-1] == '\n')
1034 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1035 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1037 /* buggy avid, it puts EOI only at every 10th frame */
1038 if (!strcmp(cbuf, "AVID"))
1041 // if (s->first_picture)
1042 // printf("mjpeg: workarounding buggy AVID\n");
1044 else if(!strcmp(cbuf, "CS=ITU601")){
1056 static int valid_marker_list[] =
1058 /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
1059 /* 0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1060 /* 1 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1061 /* 2 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1062 /* 3 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1063 /* 4 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1064 /* 5 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1065 /* 6 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1066 /* 7 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1067 /* 8 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1068 /* 9 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1069 /* a */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1070 /* b */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1071 /* c */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1072 /* d */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1073 /* e */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1074 /* f */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
1078 /* return the 8 bit start code value and update the search
1079 state. Return -1 if no start code found */
1080 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1082 const uint8_t *buf_ptr;
1089 buf_ptr = *pbuf_ptr;
1090 while (buf_ptr < buf_end) {
1093 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1104 av_log(NULL, AV_LOG_VERBOSE, "find_marker skipped %d bytes\n", skipped);
1106 *pbuf_ptr = buf_ptr;
1110 int ff_mjpeg_decode_frame(AVCodecContext *avctx,
1111 void *data, int *data_size,
1112 const uint8_t *buf, int buf_size)
1114 MJpegDecodeContext *s = avctx->priv_data;
1115 const uint8_t *buf_end, *buf_ptr;
1117 AVFrame *picture = data;
1120 buf_end = buf + buf_size;
1121 while (buf_ptr < buf_end) {
1122 /* find start next marker */
1123 start_code = find_marker(&buf_ptr, buf_end);
1126 if (start_code < 0) {
1129 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);
1131 if ((buf_end - buf_ptr) > s->buffer_size)
1134 s->buffer_size = buf_end-buf_ptr;
1135 s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
1136 av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
1140 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1141 if (start_code == SOS && !s->ls)
1143 const uint8_t *src = buf_ptr;
1144 uint8_t *dst = s->buffer;
1148 uint8_t x = *(src++);
1151 if (avctx->codec_id != CODEC_ID_THP)
1154 while (src < buf_end && x == 0xff)
1157 if (x >= 0xd0 && x <= 0xd7)
1164 init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);
1166 av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1167 (buf_end - buf_ptr) - (dst - s->buffer));
1169 else if(start_code == SOS && s->ls){
1170 const uint8_t *src = buf_ptr;
1171 uint8_t *dst = s->buffer;
1179 while (src + t < buf_end){
1180 uint8_t x = src[t++];
1182 while((src + t < buf_end) && x == 0xff)
1192 init_put_bits(&pb, dst, t);
1194 /* unescape bitstream */
1196 uint8_t x = src[b++];
1197 put_bits(&pb, 8, x);
1200 put_bits(&pb, 7, x);
1204 flush_put_bits(&pb);
1206 init_get_bits(&s->gb, dst, bit_count);
1209 init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);
1211 s->start_code = start_code;
1212 if(s->avctx->debug & FF_DEBUG_STARTCODE){
1213 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1216 /* process markers */
1217 if (start_code >= 0xd0 && start_code <= 0xd7) {
1218 av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);
1220 } else if (start_code >= APP0 && start_code <= APP15) {
1221 mjpeg_decode_app(s);
1223 } else if (start_code == COM){
1224 mjpeg_decode_com(s);
1227 switch(start_code) {
1229 s->restart_interval = 0;
1231 s->restart_count = 0;
1232 /* nothing to do on SOI */
1235 ff_mjpeg_decode_dqt(s);
1238 if(ff_mjpeg_decode_dht(s) < 0){
1239 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1247 if (ff_mjpeg_decode_sof(s) < 0)
1254 if (ff_mjpeg_decode_sof(s) < 0)
1261 if (ff_mjpeg_decode_sof(s) < 0)
1268 if (ff_mjpeg_decode_sof(s) < 0)
1272 if (!ENABLE_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
1277 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1281 if (s->interlaced) {
1282 s->bottom_field ^= 1;
1283 /* if not bottom field, do not output image yet */
1284 if (s->bottom_field == !s->interlace_polarity)
1287 *picture = s->picture;
1288 *data_size = sizeof(AVFrame);
1291 picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);
1292 picture->qstride= 0;
1293 picture->qscale_table= s->qscale_table;
1294 memset(picture->qscale_table, picture->quality, (s->width+15)/16);
1295 if(avctx->debug & FF_DEBUG_QP)
1296 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
1297 picture->quality*= FF_QP2LAMBDA;
1304 ff_mjpeg_decode_sos(s);
1305 /* buggy avid puts EOI every 10-20th frame */
1306 /* if restart period is over process EOI */
1307 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1311 mjpeg_decode_dri(s);
1324 av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);
1327 // printf("mjpeg: unsupported marker (%x)\n", start_code);
1332 /* eof process start code */
1333 buf_ptr += (get_bits_count(&s->gb)+7)/8;
1334 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",
1335 (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
1340 av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);
1341 // return buf_end - buf_ptr;
1342 return buf_ptr - buf;
1345 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1347 MJpegDecodeContext *s = avctx->priv_data;
1351 av_free(s->qscale_table);
1355 free_vlc(&s->vlcs[i][j]);
1360 AVCodec mjpeg_decoder = {
1364 sizeof(MJpegDecodeContext),
1365 ff_mjpeg_decode_init,
1367 ff_mjpeg_decode_end,
1368 ff_mjpeg_decode_frame,
1371 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1374 AVCodec thp_decoder = {
1378 sizeof(MJpegDecodeContext),
1379 ff_mjpeg_decode_init,
1381 ff_mjpeg_decode_end,
1382 ff_mjpeg_decode_frame,
1385 .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),