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
36 #include "libavutil/imgutils.h"
37 #include "libavutil/avassert.h"
42 #include "jpeglsdec.h"
45 static int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table,
46 int nb_codes, int use_static, int is_ac)
48 uint8_t huff_size[256];
49 uint16_t huff_code[256];
50 uint16_t huff_sym[256];
53 assert(nb_codes <= 256);
55 memset(huff_size, 0, sizeof(huff_size));
56 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
59 huff_sym[i]= i + 16*is_ac;
61 if(is_ac) huff_sym[0]= 16*256;
63 return init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, huff_sym, 2, 2, use_static);
66 static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) {
67 build_vlc(&s->vlcs[0][0], ff_mjpeg_bits_dc_luminance,
68 ff_mjpeg_val_dc, 12, 0, 0);
69 build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,
70 ff_mjpeg_val_dc, 12, 0, 0);
71 build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance,
72 ff_mjpeg_val_ac_luminance, 251, 0, 1);
73 build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance,
74 ff_mjpeg_val_ac_chrominance, 251, 0, 1);
75 build_vlc(&s->vlcs[2][0], ff_mjpeg_bits_ac_luminance,
76 ff_mjpeg_val_ac_luminance, 251, 0, 0);
77 build_vlc(&s->vlcs[2][1], ff_mjpeg_bits_ac_chrominance,
78 ff_mjpeg_val_ac_chrominance, 251, 0, 0);
81 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
83 MJpegDecodeContext *s = avctx->priv_data;
86 s->picture_ptr = &s->picture;
89 dsputil_init(&s->dsp, avctx);
90 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
95 s->org_height = avctx->coded_height;
96 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
98 build_basic_mjpeg_vlc(s);
100 if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
102 av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
103 init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
104 if (ff_mjpeg_decode_dht(s)) {
105 av_log(avctx, AV_LOG_ERROR, "mjpeg: error using external huffman table, switching back to internal\n");
106 build_basic_mjpeg_vlc(s);
109 if (avctx->extradata_size > 9 &&
110 AV_RL32(avctx->extradata + 4) == MKTAG('f','i','e','l')) {
111 if (avctx->extradata[9] == 6) { /* quicktime icefloe 019 */
112 s->interlace_polarity = 1; /* bottom field first */
113 av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
116 if (avctx->codec->id == CODEC_ID_AMV)
123 /* quantize tables */
124 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
126 int len, index, i, j;
128 len = get_bits(&s->gb, 16) - 2;
131 /* only 8 bit precision handled */
132 if (get_bits(&s->gb, 4) != 0)
134 av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
137 index = get_bits(&s->gb, 4);
140 av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
141 /* read quant table */
143 j = s->scantable.permutated[i];
144 s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
147 //XXX FIXME finetune, and perhaps add dc too
148 s->qscale[index]= FFMAX(
149 s->quant_matrixes[index][s->scantable.permutated[1]],
150 s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
151 av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n", index, s->qscale[index]);
158 /* decode huffman tables and build VLC decoders */
159 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
161 int len, index, i, class, n, v, code_max;
162 uint8_t bits_table[17];
163 uint8_t val_table[256];
165 len = get_bits(&s->gb, 16) - 2;
170 class = get_bits(&s->gb, 4);
173 index = get_bits(&s->gb, 4);
178 bits_table[i] = get_bits(&s->gb, 8);
182 if (len < n || n > 256)
187 v = get_bits(&s->gb, 8);
194 /* build VLC and flush previous vlc if present */
195 free_vlc(&s->vlcs[class][index]);
196 av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
197 class, index, code_max + 1);
198 if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1, 0, class > 0) < 0){
203 free_vlc(&s->vlcs[2][index]);
204 if(build_vlc(&s->vlcs[2][index], bits_table, val_table, code_max + 1, 0, 0) < 0){
212 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
214 int len, nb_components, i, width, height, pix_fmt_id;
216 /* XXX: verify len field validity */
217 len = get_bits(&s->gb, 16);
218 s->bits= get_bits(&s->gb, 8);
220 if(s->pegasus_rct) s->bits=9;
221 if(s->bits==9 && !s->pegasus_rct) s->rct=1; //FIXME ugly
223 if (s->bits != 8 && !s->lossless){
224 av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
228 height = get_bits(&s->gb, 16);
229 width = get_bits(&s->gb, 16);
231 //HACK for odd_height.mov
232 if(s->interlaced && s->width == width && s->height == height + 1)
235 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
236 if(av_image_check_size(width, height, 0, s->avctx))
239 nb_components = get_bits(&s->gb, 8);
240 if (nb_components <= 0 ||
241 nb_components > MAX_COMPONENTS)
243 if (s->ls && !(s->bits <= 8 || nb_components == 1)){
244 av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
247 s->nb_components = nb_components;
250 for(i=0;i<nb_components;i++) {
252 s->component_id[i] = get_bits(&s->gb, 8) - 1;
253 s->h_count[i] = get_bits(&s->gb, 4);
254 s->v_count[i] = get_bits(&s->gb, 4);
255 /* compute hmax and vmax (only used in interleaved case) */
256 if (s->h_count[i] > s->h_max)
257 s->h_max = s->h_count[i];
258 if (s->v_count[i] > s->v_max)
259 s->v_max = s->v_count[i];
260 s->quant_index[i] = get_bits(&s->gb, 8);
261 if (s->quant_index[i] >= 4)
263 av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
264 s->v_count[i], s->component_id[i], s->quant_index[i]);
267 if(s->ls && (s->h_max > 1 || s->v_max > 1)) {
268 av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n");
272 if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;
274 /* if different size, realloc/alloc picture */
275 /* XXX: also check h_count and v_count */
276 if (width != s->width || height != s->height) {
277 av_freep(&s->qscale_table);
283 /* test interlaced mode */
284 if (s->first_picture &&
285 s->org_height != 0 &&
286 s->height < ((s->org_height * 3) / 4)) {
288 s->bottom_field = s->interlace_polarity;
289 s->picture_ptr->interlaced_frame = 1;
290 s->picture_ptr->top_field_first = !s->interlace_polarity;
294 avcodec_set_dimensions(s->avctx, width, height);
296 s->qscale_table= av_mallocz((s->width+15)/16);
298 s->first_picture = 0;
301 if(s->interlaced && (s->bottom_field == !s->interlace_polarity))
304 /* XXX: not complete test ! */
305 pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
306 (s->h_count[1] << 20) | (s->v_count[1] << 16) |
307 (s->h_count[2] << 12) | (s->v_count[2] << 8) |
308 (s->h_count[3] << 4) | s->v_count[3];
309 av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
310 //NOTE we do not allocate pictures large enough for the possible padding of h/v_count being 4
311 if(!(pix_fmt_id & 0xD0D0D0D0))
312 pix_fmt_id-= (pix_fmt_id & 0xF0F0F0F0)>>1;
313 if(!(pix_fmt_id & 0x0D0D0D0D))
314 pix_fmt_id-= (pix_fmt_id & 0x0F0F0F0F)>>1;
319 s->avctx->pix_fmt = PIX_FMT_BGRA;
321 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
322 assert(s->nb_components==3);
325 s->avctx->pix_fmt = PIX_FMT_GRAY8;
328 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
331 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
334 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
337 av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
341 if(s->nb_components > 1)
342 s->avctx->pix_fmt = PIX_FMT_RGB24;
343 else if(s->bits <= 8)
344 s->avctx->pix_fmt = PIX_FMT_GRAY8;
346 s->avctx->pix_fmt = PIX_FMT_GRAY16;
349 if(s->picture_ptr->data[0])
350 s->avctx->release_buffer(s->avctx, s->picture_ptr);
352 if(s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0){
353 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
356 s->picture_ptr->pict_type= AV_PICTURE_TYPE_I;
357 s->picture_ptr->key_frame= 1;
361 s->linesize[i]= s->picture_ptr->linesize[i] << s->interlaced;
364 // printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);
366 if (len != (8+(3*nb_components)))
368 av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
371 /* totally blank picture as progressive JPEG will only add details to it */
373 int bw = (width + s->h_max*8-1) / (s->h_max*8);
374 int bh = (height + s->v_max*8-1) / (s->v_max*8);
375 for(i=0; i<s->nb_components; i++) {
376 int size = bw * bh * s->h_count[i] * s->v_count[i];
377 av_freep(&s->blocks[i]);
378 av_freep(&s->last_nnz[i]);
379 s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
380 s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
381 s->block_stride[i] = bw * s->h_count[i];
383 memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
388 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
391 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
394 av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
395 &s->vlcs[0][dc_index]);
400 return get_xbits(&s->gb, code);
405 /* decode block and dequantize */
406 static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
407 int component, int dc_index, int ac_index, int16_t *quant_matrix)
409 int code, i, j, level, val;
412 val = mjpeg_decode_dc(s, dc_index);
414 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
417 val = val * quant_matrix[0] + s->last_dc[component];
418 s->last_dc[component] = val;
422 {OPEN_READER(re, &s->gb);
424 UPDATE_CACHE(re, &s->gb);
425 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
427 i += ((unsigned)code) >> 4;
430 if(code > MIN_CACHE_BITS - 16){
431 UPDATE_CACHE(re, &s->gb);
434 int cache=GET_CACHE(re,&s->gb);
435 int sign=(~cache)>>31;
436 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
439 LAST_SKIP_BITS(re, &s->gb, code);
442 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
445 j = s->scantable.permutated[i];
446 block[j] = level * quant_matrix[j];
449 CLOSE_READER(re, &s->gb);}
454 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block, int component,
455 int dc_index, int16_t *quant_matrix, int Al)
458 s->dsp.clear_block(block);
459 val = mjpeg_decode_dc(s, dc_index);
461 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
464 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
465 s->last_dc[component] = val;
470 /* decode block and dequantize - progressive JPEG version */
471 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
472 int ac_index, int16_t *quant_matrix,
473 int ss, int se, int Al, int *EOBRUN)
475 int code, i, j, level, val, run;
481 {OPEN_READER(re, &s->gb);
483 UPDATE_CACHE(re, &s->gb);
484 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
486 run = ((unsigned) code) >> 4;
490 if(code > MIN_CACHE_BITS - 16){
491 UPDATE_CACHE(re, &s->gb);
494 int cache=GET_CACHE(re,&s->gb);
495 int sign=(~cache)>>31;
496 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
499 LAST_SKIP_BITS(re, &s->gb, code);
503 j = s->scantable.permutated[se];
504 block[j] = level * quant_matrix[j] << Al;
507 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
510 j = s->scantable.permutated[i];
511 block[j] = level * quant_matrix[j] << Al;
513 if(run == 0xF){// ZRL - skip 15 coefficients
516 av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
522 UPDATE_CACHE(re, &s->gb);
523 val += NEG_USR32(GET_CACHE(re, &s->gb), run);
524 LAST_SKIP_BITS(re, &s->gb, run);
531 CLOSE_READER(re, &s->gb);}
537 #define REFINE_BIT(j) {\
538 UPDATE_CACHE(re, &s->gb);\
539 sign = block[j]>>15;\
540 block[j] += SHOW_UBITS(re, &s->gb, 1) * ((quant_matrix[j]^sign)-sign) << Al;\
541 LAST_SKIP_BITS(re, &s->gb, 1);\
549 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);\
554 j = s->scantable.permutated[i];\
561 /* decode block and dequantize - progressive JPEG refinement pass */
562 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
563 int ac_index, int16_t *quant_matrix,
564 int ss, int se, int Al, int *EOBRUN)
566 int code, i=ss, j, sign, val, run;
567 int last = FFMIN(se, *last_nnz);
569 OPEN_READER(re, &s->gb);
574 UPDATE_CACHE(re, &s->gb);
575 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
578 run = ((unsigned) code) >> 4;
579 UPDATE_CACHE(re, &s->gb);
580 val = SHOW_UBITS(re, &s->gb, 1);
581 LAST_SKIP_BITS(re, &s->gb, 1);
583 j = s->scantable.permutated[i];
585 block[j] = ((quant_matrix[j]^val)-val) << Al;
589 CLOSE_READER(re, &s->gb);
593 run = ((unsigned) code) >> 4;
600 UPDATE_CACHE(re, &s->gb);
601 run += SHOW_UBITS(re, &s->gb, val);
602 LAST_SKIP_BITS(re, &s->gb, val);
615 j = s->scantable.permutated[i];
619 CLOSE_READER(re, &s->gb);
626 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
628 uint16_t (*buffer)[4];
629 int left[3], top[3], topleft[3];
630 const int linesize= s->linesize[0];
631 const int mask= (1<<s->bits)-1;
633 av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size, (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
634 buffer= s->ljpeg_buffer;
637 buffer[0][i]= 1 << (s->bits + point_transform - 1);
639 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
640 const int modified_predictor= mb_y ? predictor : 1;
641 uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
643 if (s->interlaced && s->bottom_field)
644 ptr += linesize >> 1;
647 top[i]= left[i]= topleft[i]= buffer[0][i];
649 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
650 if (s->restart_interval && !s->restart_count)
651 s->restart_count = s->restart_interval;
657 top[i]= buffer[mb_x][i];
659 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
662 buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
665 if (s->restart_interval && !--s->restart_count) {
666 align_get_bits(&s->gb);
667 skip_bits(&s->gb, 16); /* skip RSTn */
672 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
673 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
674 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
675 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
677 }else if(s->pegasus_rct){
678 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
679 ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
680 ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
681 ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
684 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
685 ptr[4*mb_x+0] = buffer[mb_x][2];
686 ptr[4*mb_x+1] = buffer[mb_x][1];
687 ptr[4*mb_x+2] = buffer[mb_x][0];
694 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
696 const int nb_components=3;
698 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
699 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
700 if (s->restart_interval && !s->restart_count)
701 s->restart_count = s->restart_interval;
703 if(mb_x==0 || mb_y==0 || s->interlaced){
704 for(i=0;i<nb_components;i++) {
706 int n, h, v, x, y, c, j, linesize;
708 c = s->comp_index[i];
713 linesize= s->linesize[c];
718 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
721 pred= 128 << point_transform;
727 pred= ptr[-linesize];
729 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
733 if (s->interlaced && s->bottom_field)
734 ptr += linesize >> 1;
735 *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
744 for(i=0;i<nb_components;i++) {
746 int n, h, v, x, y, c, j, linesize;
748 c = s->comp_index[i];
753 linesize= s->linesize[c];
758 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
759 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
760 *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
768 if (s->restart_interval && !--s->restart_count) {
769 align_get_bits(&s->gb);
770 skip_bits(&s->gb, 16); /* skip RSTn */
777 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
778 int linesize, int lowres)
781 case 0: copy_block8(dst, src, linesize, linesize, 8);
783 case 1: copy_block4(dst, src, linesize, linesize, 4);
785 case 2: copy_block2(dst, src, linesize, linesize, 2);
792 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al,
793 const uint8_t *mb_bitmask, const AVFrame *reference){
795 uint8_t* data[MAX_COMPONENTS];
796 const uint8_t *reference_data[MAX_COMPONENTS];
797 int linesize[MAX_COMPONENTS];
798 GetBitContext mb_bitmask_gb;
801 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width*s->mb_height);
804 if(s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
805 av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
808 for(i=0; i < nb_components; i++) {
809 int c = s->comp_index[i];
810 data[c] = s->picture_ptr->data[c];
811 reference_data[c] = reference ? reference->data[c] : NULL;
812 linesize[c]=s->linesize[c];
813 s->coefs_finished[c] |= 1;
815 //picture should be flipped upside-down for this codec
816 int offset = (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 ));
818 reference_data[c] += offset;
823 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
824 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
825 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
827 if (s->restart_interval && !s->restart_count)
828 s->restart_count = s->restart_interval;
830 if(get_bits_count(&s->gb)>s->gb.size_in_bits){
831 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n", get_bits_count(&s->gb) - s->gb.size_in_bits);
834 for(i=0;i<nb_components;i++) {
836 int n, h, v, x, y, c, j;
839 c = s->comp_index[i];
845 block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
846 (h * mb_x + x) * 8) >> s->avctx->lowres);
848 if(s->interlaced && s->bottom_field)
849 block_offset += linesize[c] >> 1;
850 ptr = data[c] + block_offset;
851 if(!s->progressive) {
853 mjpeg_copy_block(ptr, reference_data[c] + block_offset, linesize[c], s->avctx->lowres);
855 s->dsp.clear_block(s->block);
856 if(decode_block(s, s->block, i,
857 s->dc_index[i], s->ac_index[i],
858 s->quant_matrixes[ s->quant_index[c] ]) < 0) {
859 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
862 s->dsp.idct_put(ptr, linesize[c], s->block);
865 int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x);
866 DCTELEM *block = s->blocks[c][block_idx];
868 block[0] += get_bits1(&s->gb) * s->quant_matrixes[ s->quant_index[c] ][0] << Al;
869 else if(decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[ s->quant_index[c] ], Al) < 0) {
870 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
874 // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
875 //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);
883 if (s->restart_interval && !--s->restart_count) {
884 align_get_bits(&s->gb);
885 skip_bits(&s->gb, 16); /* skip RSTn */
886 for (i=0; i<nb_components; i++) /* reset dc */
887 s->last_dc[i] = 1024;
894 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al){
897 int c = s->comp_index[0];
898 uint8_t* data = s->picture.data[c];
899 int linesize = s->linesize[c];
901 int16_t *quant_matrix = s->quant_matrixes[ s->quant_index[c] ];
904 s->coefs_finished[c] |= (1LL<<(se+1))-(1LL<<ss);
905 last_scan = !~s->coefs_finished[c];
908 if(s->interlaced && s->bottom_field)
909 data += linesize >> 1;
911 for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
912 uint8_t *ptr = data + (mb_y*linesize*8 >> s->avctx->lowres);
913 int block_idx = mb_y * s->block_stride[c];
914 DCTELEM (*block)[64] = &s->blocks[c][block_idx];
915 uint8_t *last_nnz = &s->last_nnz[c][block_idx];
916 for(mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
919 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
920 quant_matrix, ss, se, Al, &EOBRUN);
922 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
923 quant_matrix, ss, se, Al, &EOBRUN);
925 av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
929 s->dsp.idct_put(ptr, linesize, *block);
930 ptr += 8 >> s->avctx->lowres;
937 int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
938 const uint8_t *mb_bitmask, const AVFrame *reference)
940 int len, nb_components, i, h, v, predictor, point_transform;
942 const int block_size= s->lossless ? 1 : 8;
945 /* XXX: verify len field validity */
946 len = get_bits(&s->gb, 16);
947 nb_components = get_bits(&s->gb, 8);
948 if (nb_components == 0 || nb_components > MAX_COMPONENTS){
949 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: nb_components (%d) unsupported\n", nb_components);
952 if (len != 6+2*nb_components)
954 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
957 for(i=0;i<nb_components;i++) {
958 id = get_bits(&s->gb, 8) - 1;
959 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
960 /* find component index */
961 for(index=0;index<s->nb_components;index++)
962 if (id == s->component_id[index])
964 if (index == s->nb_components)
966 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index);
969 /* Metasoft MJPEG codec has Cb and Cr swapped */
970 if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
971 && nb_components == 3 && s->nb_components == 3 && i)
974 s->comp_index[i] = index;
976 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
977 s->h_scount[i] = s->h_count[index];
978 s->v_scount[i] = s->v_count[index];
980 s->dc_index[i] = get_bits(&s->gb, 4);
981 s->ac_index[i] = get_bits(&s->gb, 4);
983 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
984 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
986 if (!s->vlcs[0][s->dc_index[i]].table || !s->vlcs[1][s->ac_index[i]].table)
990 predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
991 ilv= get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
992 prev_shift = get_bits(&s->gb, 4); /* Ah */
993 point_transform= get_bits(&s->gb, 4); /* Al */
995 for(i=0;i<nb_components;i++)
996 s->last_dc[i] = 1024;
998 if (nb_components > 1) {
999 /* interleaved stream */
1000 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1001 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1002 } else if(!s->ls) { /* skip this for JPEG-LS */
1003 h = s->h_max / s->h_scount[0];
1004 v = s->v_max / s->v_scount[0];
1005 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1006 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1007 s->nb_blocks[0] = 1;
1012 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1013 av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n", s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1014 predictor, point_transform, ilv, s->bits,
1015 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
1018 /* mjpeg-b can have padding bytes between sos and image data, skip them */
1019 for (i = s->mjpb_skiptosod; i > 0; i--)
1020 skip_bits(&s->gb, 8);
1023 av_assert0(s->picture_ptr == &s->picture);
1024 if(CONFIG_JPEGLS_DECODER && s->ls){
1026 // reset_ls_coding_parameters(s, 0);
1028 if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
1032 if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
1035 if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
1040 if(s->progressive && predictor) {
1041 av_assert0(s->picture_ptr == &s->picture);
1042 if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0)
1045 if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
1046 mb_bitmask, reference) < 0)
1053 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1057 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1059 if (get_bits(&s->gb, 16) != 4)
1061 s->restart_interval = get_bits(&s->gb, 16);
1062 s->restart_count = 0;
1063 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);
1068 static int mjpeg_decode_app(MJpegDecodeContext *s)
1072 len = get_bits(&s->gb, 16);
1075 if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)
1078 id = get_bits_long(&s->gb, 32);
1079 id = av_be2ne32(id);
1082 if(s->avctx->debug & FF_DEBUG_STARTCODE){
1083 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1086 /* buggy AVID, it puts EOI only at every 10th frame */
1087 /* also this fourcc is used by non-avid files too, it holds some
1088 informations, but it's always present in AVID creates files */
1089 if (id == AV_RL32("AVI1"))
1096 4bytes field_size_less_padding
1099 // if (s->first_picture)
1100 // printf("mjpeg: workarounding buggy AVID\n");
1101 i = get_bits(&s->gb, 8);
1102 if (i==2) s->bottom_field= 1;
1103 else if(i==1) s->bottom_field= 0;
1105 skip_bits(&s->gb, 8);
1106 skip_bits(&s->gb, 32);
1107 skip_bits(&s->gb, 32);
1110 // if (s->interlace_polarity)
1111 // printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
1117 if (id == AV_RL32("JFIF"))
1119 int t_w, t_h, v1, v2;
1120 skip_bits(&s->gb, 8); /* the trailing zero-byte */
1121 v1= get_bits(&s->gb, 8);
1122 v2= get_bits(&s->gb, 8);
1123 skip_bits(&s->gb, 8);
1125 s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
1126 s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
1128 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1129 av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1131 s->avctx->sample_aspect_ratio.num,
1132 s->avctx->sample_aspect_ratio.den
1135 t_w = get_bits(&s->gb, 8);
1136 t_h = get_bits(&s->gb, 8);
1139 /* skip thumbnail */
1140 if (len-10-(t_w*t_h*3) > 0)
1147 if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))
1149 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1150 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1151 skip_bits(&s->gb, 16); /* version */
1152 skip_bits(&s->gb, 16); /* flags0 */
1153 skip_bits(&s->gb, 16); /* flags1 */
1154 skip_bits(&s->gb, 8); /* transform */
1159 if (id == AV_RL32("LJIF")){
1160 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1161 av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");
1162 skip_bits(&s->gb, 16); /* version ? */
1163 skip_bits(&s->gb, 16); /* unknwon always 0? */
1164 skip_bits(&s->gb, 16); /* unknwon always 0? */
1165 skip_bits(&s->gb, 16); /* unknwon always 0? */
1166 switch( get_bits(&s->gb, 8)){
1176 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1183 if ((s->start_code == APP1) && (len > (0x28 - 8)))
1185 id = get_bits_long(&s->gb, 32);
1186 id = av_be2ne32(id);
1188 if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */
1191 skip_bits(&s->gb, 32); /* field size */
1192 skip_bits(&s->gb, 32); /* pad field size */
1193 skip_bits(&s->gb, 32); /* next off */
1194 skip_bits(&s->gb, 32); /* quant off */
1195 skip_bits(&s->gb, 32); /* huff off */
1196 skip_bits(&s->gb, 32); /* image off */
1197 skip_bits(&s->gb, 32); /* scan off */
1198 skip_bits(&s->gb, 32); /* data off */
1200 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1201 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1206 /* slow but needed for extreme adobe jpegs */
1208 av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");
1210 skip_bits(&s->gb, 8);
1215 static int mjpeg_decode_com(MJpegDecodeContext *s)
1217 int len = get_bits(&s->gb, 16);
1218 if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
1219 char *cbuf = av_malloc(len - 1);
1222 for (i = 0; i < len - 2; i++)
1223 cbuf[i] = get_bits(&s->gb, 8);
1224 if (i > 0 && cbuf[i-1] == '\n')
1229 if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1230 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1232 /* buggy avid, it puts EOI only at every 10th frame */
1233 if (!strcmp(cbuf, "AVID"))
1236 // if (s->first_picture)
1237 // printf("mjpeg: workarounding buggy AVID\n");
1239 else if(!strcmp(cbuf, "CS=ITU601")){
1242 else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
1243 (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){
1255 static int valid_marker_list[] =
1257 /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
1258 /* 0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1259 /* 1 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1260 /* 2 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1261 /* 3 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1262 /* 4 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1263 /* 5 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1264 /* 6 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1265 /* 7 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1266 /* 8 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1267 /* 9 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1268 /* a */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1269 /* b */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1270 /* c */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1271 /* d */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1272 /* e */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1273 /* f */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
1277 /* return the 8 bit start code value and update the search
1278 state. Return -1 if no start code found */
1279 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1281 const uint8_t *buf_ptr;
1288 buf_ptr = *pbuf_ptr;
1289 while (buf_ptr < buf_end) {
1292 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1302 av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1303 *pbuf_ptr = buf_ptr;
1307 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1308 const uint8_t **buf_ptr, const uint8_t *buf_end,
1309 const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size)
1312 start_code = find_marker(buf_ptr, buf_end);
1314 if ((buf_end - *buf_ptr) > s->buffer_size)
1317 s->buffer_size = buf_end - *buf_ptr;
1318 s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
1319 av_log(s->avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
1323 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1324 if (start_code == SOS && !s->ls)
1326 const uint8_t *src = *buf_ptr;
1327 uint8_t *dst = s->buffer;
1331 uint8_t x = *(src++);
1334 if (s->avctx->codec_id != CODEC_ID_THP)
1337 while (src < buf_end && x == 0xff)
1340 if (x >= 0xd0 && x <= 0xd7)
1347 *unescaped_buf_ptr = s->buffer;
1348 *unescaped_buf_size = dst - s->buffer;
1350 av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1351 (buf_end - *buf_ptr) - (dst - s->buffer));
1353 else if(start_code == SOS && s->ls){
1354 const uint8_t *src = *buf_ptr;
1355 uint8_t *dst = s->buffer;
1363 while (src + t < buf_end){
1364 uint8_t x = src[t++];
1366 while((src + t < buf_end) && x == 0xff)
1376 init_put_bits(&pb, dst, t);
1378 /* unescape bitstream */
1380 uint8_t x = src[b++];
1381 put_bits(&pb, 8, x);
1384 put_bits(&pb, 7, x);
1388 flush_put_bits(&pb);
1390 *unescaped_buf_ptr = dst;
1391 *unescaped_buf_size = (bit_count + 7) >> 3;
1395 *unescaped_buf_ptr = *buf_ptr;
1396 *unescaped_buf_size = buf_end - *buf_ptr;
1402 int ff_mjpeg_decode_frame(AVCodecContext *avctx,
1403 void *data, int *data_size,
1406 const uint8_t *buf = avpkt->data;
1407 int buf_size = avpkt->size;
1408 MJpegDecodeContext *s = avctx->priv_data;
1409 const uint8_t *buf_end, *buf_ptr;
1410 const uint8_t *unescaped_buf_ptr;
1411 int unescaped_buf_size;
1413 AVFrame *picture = data;
1415 s->got_picture = 0; // picture from previous image can not be reused
1417 buf_end = buf + buf_size;
1418 while (buf_ptr < buf_end) {
1419 /* find start next marker */
1420 start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1421 &unescaped_buf_ptr, &unescaped_buf_size);
1424 if (start_code < 0) {
1427 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);
1429 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size*8);
1431 s->start_code = start_code;
1432 if(s->avctx->debug & FF_DEBUG_STARTCODE){
1433 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1436 /* process markers */
1437 if (start_code >= 0xd0 && start_code <= 0xd7) {
1438 av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);
1440 } else if (start_code >= APP0 && start_code <= APP15) {
1441 mjpeg_decode_app(s);
1443 } else if (start_code == COM){
1444 mjpeg_decode_com(s);
1447 switch(start_code) {
1449 s->restart_interval = 0;
1451 s->restart_count = 0;
1452 /* nothing to do on SOI */
1455 ff_mjpeg_decode_dqt(s);
1458 if(ff_mjpeg_decode_dht(s) < 0){
1459 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1468 if (ff_mjpeg_decode_sof(s) < 0)
1475 if (ff_mjpeg_decode_sof(s) < 0)
1482 if (ff_mjpeg_decode_sof(s) < 0)
1489 if (ff_mjpeg_decode_sof(s) < 0)
1493 if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
1498 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1501 if (!s->got_picture) {
1502 av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");
1506 if (s->interlaced) {
1507 s->bottom_field ^= 1;
1508 /* if not bottom field, do not output image yet */
1509 if (s->bottom_field == !s->interlace_polarity)
1512 *picture = *s->picture_ptr;
1513 *data_size = sizeof(AVFrame);
1516 picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);
1517 picture->qstride= 0;
1518 picture->qscale_table= s->qscale_table;
1519 memset(picture->qscale_table, picture->quality, (s->width+15)/16);
1520 if(avctx->debug & FF_DEBUG_QP)
1521 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
1522 picture->quality*= FF_QP2LAMBDA;
1529 if (!s->got_picture) {
1530 av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");
1533 ff_mjpeg_decode_sos(s, NULL, NULL);
1534 /* buggy avid puts EOI every 10-20th frame */
1535 /* if restart period is over process EOI */
1536 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1540 mjpeg_decode_dri(s);
1552 av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);
1555 // printf("mjpeg: unsupported marker (%x)\n", start_code);
1560 /* eof process start code */
1561 buf_ptr += (get_bits_count(&s->gb)+7)/8;
1562 av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",
1563 (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
1567 if (s->got_picture) {
1568 av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1571 av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1574 av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);
1575 // return buf_end - buf_ptr;
1576 return buf_ptr - buf;
1579 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1581 MJpegDecodeContext *s = avctx->priv_data;
1584 if (s->picture_ptr && s->picture_ptr->data[0])
1585 avctx->release_buffer(avctx, s->picture_ptr);
1588 av_free(s->qscale_table);
1589 av_freep(&s->ljpeg_buffer);
1590 s->ljpeg_buffer_size=0;
1594 free_vlc(&s->vlcs[i][j]);
1596 for(i=0; i<MAX_COMPONENTS; i++) {
1597 av_freep(&s->blocks[i]);
1598 av_freep(&s->last_nnz[i]);
1603 AVCodec ff_mjpeg_decoder = {
1607 sizeof(MJpegDecodeContext),
1608 ff_mjpeg_decode_init,
1610 ff_mjpeg_decode_end,
1611 ff_mjpeg_decode_frame,
1615 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1618 AVCodec ff_thp_decoder = {
1622 sizeof(MJpegDecodeContext),
1623 ff_mjpeg_decode_init,
1625 ff_mjpeg_decode_end,
1626 ff_mjpeg_decode_frame,
1630 .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),