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"
38 #include "libavutil/opt.h"
43 #include "jpeglsdec.h"
46 static int build_vlc(VLC *vlc, const uint8_t *bits_table,
47 const uint8_t *val_table, int nb_codes,
48 int use_static, int is_ac)
50 uint8_t huff_size[256];
51 uint16_t huff_code[256];
52 uint16_t huff_sym[256];
55 assert(nb_codes <= 256);
57 memset(huff_size, 0, sizeof(huff_size));
58 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
60 for (i = 0; i < 256; i++)
61 huff_sym[i] = i + 16 * is_ac;
64 huff_sym[0] = 16 * 256;
66 return init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
67 huff_code, 2, 2, huff_sym, 2, 2, use_static);
70 static void build_basic_mjpeg_vlc(MJpegDecodeContext *s)
72 build_vlc(&s->vlcs[0][0], ff_mjpeg_bits_dc_luminance,
73 ff_mjpeg_val_dc, 12, 0, 0);
74 build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,
75 ff_mjpeg_val_dc, 12, 0, 0);
76 build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance,
77 ff_mjpeg_val_ac_luminance, 251, 0, 1);
78 build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance,
79 ff_mjpeg_val_ac_chrominance, 251, 0, 1);
80 build_vlc(&s->vlcs[2][0], ff_mjpeg_bits_ac_luminance,
81 ff_mjpeg_val_ac_luminance, 251, 0, 0);
82 build_vlc(&s->vlcs[2][1], ff_mjpeg_bits_ac_chrominance,
83 ff_mjpeg_val_ac_chrominance, 251, 0, 0);
86 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
88 MJpegDecodeContext *s = avctx->priv_data;
91 s->picture_ptr = &s->picture;
92 avcodec_get_frame_defaults(&s->picture);
95 dsputil_init(&s->dsp, avctx);
96 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
100 s->first_picture = 1;
101 s->org_height = avctx->coded_height;
102 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
104 build_basic_mjpeg_vlc(s);
106 if (s->extern_huff) {
107 av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
108 init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
109 if (ff_mjpeg_decode_dht(s)) {
110 av_log(avctx, AV_LOG_ERROR,
111 "mjpeg: error using external huffman table, switching back to internal\n");
112 build_basic_mjpeg_vlc(s);
115 if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
116 s->interlace_polarity = 1; /* bottom field first */
117 av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
119 if (avctx->codec->id == CODEC_ID_AMV)
126 /* quantize tables */
127 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
129 int len, index, i, j;
131 len = get_bits(&s->gb, 16) - 2;
134 /* only 8 bit precision handled */
135 if (get_bits(&s->gb, 4) != 0) {
136 av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
139 index = get_bits(&s->gb, 4);
142 av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
143 /* read quant table */
144 for (i = 0; i < 64; i++) {
145 j = s->scantable.permutated[i];
146 s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
149 // XXX FIXME finetune, and perhaps add dc too
150 s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
151 s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
152 av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
153 index, s->qscale[index]);
159 /* decode huffman tables and build VLC decoders */
160 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
162 int len, index, i, class, n, v, code_max;
163 uint8_t bits_table[17];
164 uint8_t val_table[256];
166 len = get_bits(&s->gb, 16) - 2;
171 class = get_bits(&s->gb, 4);
174 index = get_bits(&s->gb, 4);
178 for (i = 1; i <= 16; i++) {
179 bits_table[i] = get_bits(&s->gb, 8);
183 if (len < n || n > 256)
187 for (i = 0; i < n; i++) {
188 v = get_bits(&s->gb, 8);
195 /* build VLC and flush previous vlc if present */
196 free_vlc(&s->vlcs[class][index]);
197 av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
198 class, index, code_max + 1);
199 if (build_vlc(&s->vlcs[class][index], bits_table, val_table,
200 code_max + 1, 0, class > 0) < 0)
204 free_vlc(&s->vlcs[2][index]);
205 if (build_vlc(&s->vlcs[2][index], bits_table, val_table,
206 code_max + 1, 0, 0) < 0)
213 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
215 int len, nb_components, i, width, height, pix_fmt_id;
218 s->upscale_h = s->upscale_v = 0;
220 /* XXX: verify len field validity */
221 len = get_bits(&s->gb, 16);
222 s->bits = get_bits(&s->gb, 8);
226 if (s->bits == 9 && !s->pegasus_rct)
227 s->rct = 1; // FIXME ugly
229 if (s->bits != 8 && !s->lossless) {
230 av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
234 if(s->lossless && s->avctx->lowres){
235 av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
239 height = get_bits(&s->gb, 16);
240 width = get_bits(&s->gb, 16);
242 // HACK for odd_height.mov
243 if (s->interlaced && s->width == width && s->height == height + 1)
246 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
247 if (av_image_check_size(width, height, 0, s->avctx))
250 nb_components = get_bits(&s->gb, 8);
251 if (nb_components <= 0 ||
252 nb_components > MAX_COMPONENTS)
254 if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
255 av_log(s->avctx, AV_LOG_ERROR,
256 "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
259 s->nb_components = nb_components;
262 for (i = 0; i < nb_components; i++) {
264 s->component_id[i] = get_bits(&s->gb, 8) - 1;
265 s->h_count[i] = get_bits(&s->gb, 4);
266 s->v_count[i] = get_bits(&s->gb, 4);
267 /* compute hmax and vmax (only used in interleaved case) */
268 if (s->h_count[i] > s->h_max)
269 s->h_max = s->h_count[i];
270 if (s->v_count[i] > s->v_max)
271 s->v_max = s->v_count[i];
272 s->quant_index[i] = get_bits(&s->gb, 8);
273 if (s->quant_index[i] >= 4)
275 av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
276 i, s->h_count[i], s->v_count[i],
277 s->component_id[i], s->quant_index[i]);
280 if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
281 av_log(s->avctx, AV_LOG_ERROR,
282 "Subsampling in JPEG-LS is not supported.\n");
286 if (s->v_max == 1 && s->h_max == 1 && s->lossless==1 && nb_components==3)
289 /* if different size, realloc/alloc picture */
290 /* XXX: also check h_count and v_count */
291 if (width != s->width || height != s->height) {
292 av_freep(&s->qscale_table);
298 /* test interlaced mode */
299 if (s->first_picture &&
300 s->org_height != 0 &&
301 s->height < ((s->org_height * 3) / 4)) {
303 s->bottom_field = s->interlace_polarity;
304 s->picture_ptr->interlaced_frame = 1;
305 s->picture_ptr->top_field_first = !s->interlace_polarity;
309 avcodec_set_dimensions(s->avctx, width, height);
311 s->qscale_table = av_mallocz((s->width + 15) / 16);
312 s->first_picture = 0;
315 if (s->interlaced && (s->bottom_field == !s->interlace_polarity))
318 /* XXX: not complete test ! */
319 pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
320 (s->h_count[1] << 20) | (s->v_count[1] << 16) |
321 (s->h_count[2] << 12) | (s->v_count[2] << 8) |
322 (s->h_count[3] << 4) | s->v_count[3];
323 av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
324 /* NOTE we do not allocate pictures large enough for the possible
325 * padding of h/v_count being 4 */
326 if (!(pix_fmt_id & 0xD0D0D0D0))
327 pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
328 if (!(pix_fmt_id & 0x0D0D0D0D))
329 pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
331 switch (pix_fmt_id) {
334 s->avctx->pix_fmt = PIX_FMT_BGR24;
336 if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
337 s->avctx->pix_fmt = PIX_FMT_GBR24P;
339 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
340 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
343 assert(s->nb_components == 3);
347 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
348 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
350 s->upscale_h = (pix_fmt_id == 0x22122100);
351 s->chroma_height = s->height;
355 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
356 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
357 s->upscale_v = (pix_fmt_id == 0x22211200);
359 s->chroma_height = s->height;
362 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
363 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
366 s->chroma_height = s->height / 2;
370 s->avctx->pix_fmt = PIX_FMT_GRAY8;
372 s->avctx->pix_fmt = PIX_FMT_GRAY16;
377 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
378 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
379 s->upscale_h = (pix_fmt_id == 0x22211100) * 2 + (pix_fmt_id == 0x22112100);
380 s->chroma_height = s->height / 2;
383 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
384 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
388 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
389 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
390 s->upscale_v = (pix_fmt_id == 0x22121100) + 1;
393 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
394 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
397 av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
401 s->upscale_h = s->upscale_v = 0;
402 if (s->nb_components > 1)
403 s->avctx->pix_fmt = PIX_FMT_RGB24;
404 else if (s->bits <= 8)
405 s->avctx->pix_fmt = PIX_FMT_GRAY8;
407 s->avctx->pix_fmt = PIX_FMT_GRAY16;
410 if (s->picture_ptr->data[0])
411 s->avctx->release_buffer(s->avctx, s->picture_ptr);
413 if (s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0) {
414 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
417 s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
418 s->picture_ptr->key_frame = 1;
421 for (i = 0; i < 3; i++)
422 s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
424 // printf("%d %d %d %d %d %d\n",
425 // s->width, s->height, s->linesize[0], s->linesize[1],
426 // s->interlaced, s->avctx->height);
428 if (len != (8 + (3 * nb_components)))
429 av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
431 /* totally blank picture as progressive JPEG will only add details to it */
432 if (s->progressive) {
433 int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
434 int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
435 for (i = 0; i < s->nb_components; i++) {
436 int size = bw * bh * s->h_count[i] * s->v_count[i];
437 av_freep(&s->blocks[i]);
438 av_freep(&s->last_nnz[i]);
439 s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
440 s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
441 s->block_stride[i] = bw * s->h_count[i];
443 memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
448 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
451 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
453 av_log(s->avctx, AV_LOG_WARNING,
454 "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
455 0, dc_index, &s->vlcs[0][dc_index]);
460 return get_xbits(&s->gb, code);
465 /* decode block and dequantize */
466 static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,
467 int dc_index, int ac_index, int16_t *quant_matrix)
469 int code, i, j, level, val;
472 val = mjpeg_decode_dc(s, dc_index);
474 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
477 val = val * quant_matrix[0] + s->last_dc[component];
478 s->last_dc[component] = val;
482 {OPEN_READER(re, &s->gb);
484 UPDATE_CACHE(re, &s->gb);
485 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
487 i += ((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);
502 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
505 j = s->scantable.permutated[i];
506 block[j] = level * quant_matrix[j];
509 CLOSE_READER(re, &s->gb);}
514 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block,
515 int component, int dc_index,
516 int16_t *quant_matrix, int Al)
519 s->dsp.clear_block(block);
520 val = mjpeg_decode_dc(s, dc_index);
522 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
525 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
526 s->last_dc[component] = val;
531 /* decode block and dequantize - progressive JPEG version */
532 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
533 uint8_t *last_nnz, int ac_index,
534 int16_t *quant_matrix,
535 int ss, int se, int Al, int *EOBRUN)
537 int code, i, j, level, val, run;
545 OPEN_READER(re, &s->gb);
546 for (i = ss; ; i++) {
547 UPDATE_CACHE(re, &s->gb);
548 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
550 run = ((unsigned) code) >> 4;
554 if (code > MIN_CACHE_BITS - 16)
555 UPDATE_CACHE(re, &s->gb);
558 int cache = GET_CACHE(re, &s->gb);
559 int sign = (~cache) >> 31;
560 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
563 LAST_SKIP_BITS(re, &s->gb, code);
567 j = s->scantable.permutated[se];
568 block[j] = level * quant_matrix[j] << Al;
571 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
574 j = s->scantable.permutated[i];
575 block[j] = level * quant_matrix[j] << Al;
577 if (run == 0xF) {// ZRL - skip 15 coefficients
580 av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
586 UPDATE_CACHE(re, &s->gb);
587 val += NEG_USR32(GET_CACHE(re, &s->gb), run);
588 LAST_SKIP_BITS(re, &s->gb, run);
595 CLOSE_READER(re, &s->gb);
604 #define REFINE_BIT(j) { \
605 UPDATE_CACHE(re, &s->gb); \
606 sign = block[j] >> 15; \
607 block[j] += SHOW_UBITS(re, &s->gb, 1) * \
608 ((quant_matrix[j] ^ sign) - sign) << Al; \
609 LAST_SKIP_BITS(re, &s->gb, 1); \
617 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
622 j = s->scantable.permutated[i]; \
625 else if (run-- == 0) \
629 /* decode block and dequantize - progressive JPEG refinement pass */
630 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block,
632 int ac_index, int16_t *quant_matrix,
633 int ss, int se, int Al, int *EOBRUN)
635 int code, i = ss, j, sign, val, run;
636 int last = FFMIN(se, *last_nnz);
638 OPEN_READER(re, &s->gb);
643 UPDATE_CACHE(re, &s->gb);
644 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
647 run = ((unsigned) code) >> 4;
648 UPDATE_CACHE(re, &s->gb);
649 val = SHOW_UBITS(re, &s->gb, 1);
650 LAST_SKIP_BITS(re, &s->gb, 1);
652 j = s->scantable.permutated[i];
654 block[j] = ((quant_matrix[j]^val) - val) << Al;
658 CLOSE_READER(re, &s->gb);
662 run = ((unsigned) code) >> 4;
669 UPDATE_CACHE(re, &s->gb);
670 run += SHOW_UBITS(re, &s->gb, val);
671 LAST_SKIP_BITS(re, &s->gb, val);
683 for (; i <= last; i++) {
684 j = s->scantable.permutated[i];
688 CLOSE_READER(re, &s->gb);
695 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int predictor, int point_transform)
698 uint16_t (*buffer)[4];
699 int left[3], top[3], topleft[3];
700 const int linesize = s->linesize[0];
701 const int mask = (1 << s->bits) - 1;
705 s->restart_count = s->restart_interval;
707 av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
708 (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
709 buffer = s->ljpeg_buffer;
711 for (i = 0; i < 3; i++)
712 buffer[0][i] = 1 << (s->bits - 1);
714 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
715 uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
717 if (s->interlaced && s->bottom_field)
718 ptr += linesize >> 1;
720 for (i = 0; i < 3; i++)
721 top[i] = left[i] = topleft[i] = buffer[0][i];
723 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
724 int modified_predictor = predictor;
726 if (s->restart_interval && !s->restart_count){
727 s->restart_count = s->restart_interval;
731 top[i] = left[i]= topleft[i]= 1 << (s->bits - 1);
733 if (mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || !mb_x)
734 modified_predictor = 1;
736 for (i=0;i<nb_components;i++) {
740 top[i] = buffer[mb_x][i];
742 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
744 dc = mjpeg_decode_dc(s, s->dc_index[i]);
748 left[i] = buffer[mb_x][i] =
749 mask & (pred + (dc << point_transform));
752 if (s->restart_interval && !--s->restart_count) {
753 align_get_bits(&s->gb);
754 skip_bits(&s->gb, 16); /* skip RSTn */
759 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
760 ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
761 ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
762 ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
764 } else if (s->pegasus_rct) {
765 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
766 ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
767 ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
768 ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
771 for(i=0; i<nb_components; i++) {
772 int c= s->comp_index[i];
773 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
774 ptr[3*mb_x+2-c] = buffer[mb_x][i];
782 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
786 const int nb_components=s->nb_components;
787 int bits= (s->bits+7)&~7;
791 point_transform += bits - s->bits;
793 av_assert0(nb_components==1 || nb_components==3);
795 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
796 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
797 if (s->restart_interval && !s->restart_count){
798 s->restart_count = s->restart_interval;
803 if(!mb_x || mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || s->interlaced){
804 int toprow = mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x;
805 int leftcol = !mb_x || mb_y == resync_mb_y && mb_x == resync_mb_x;
806 for (i = 0; i < nb_components; i++) {
809 int n, h, v, x, y, c, j, linesize;
811 c = s->comp_index[i];
816 linesize= s->linesize[c];
818 if(bits>8) linesize /= 2;
823 dc = mjpeg_decode_dc(s, s->dc_index[i]);
827 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
830 pred= 1 << (bits - 1);
836 pred= ptr[-linesize];
838 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
842 if (s->interlaced && s->bottom_field)
843 ptr += linesize >> 1;
844 pred &= (-1)<<(8-s->bits);
845 *ptr= pred + (dc << point_transform);
847 ptr16 = s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x); //FIXME optimize this crap
850 pred= 1 << (bits - 1);
856 pred= ptr16[-linesize];
858 PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
862 if (s->interlaced && s->bottom_field)
863 ptr16 += linesize >> 1;
864 pred &= (-1)<<(16-s->bits);
865 *ptr16= pred + (dc << point_transform);
874 for (i = 0; i < nb_components; i++) {
877 int n, h, v, x, y, c, j, linesize, dc;
879 c = s->comp_index[i];
884 linesize = s->linesize[c];
886 if(bits>8) linesize /= 2;
888 for (j = 0; j < n; j++) {
891 dc = mjpeg_decode_dc(s, s->dc_index[i]);
895 ptr = s->picture.data[c] +
896 (linesize * (v * mb_y + y)) +
897 (h * mb_x + x); //FIXME optimize this crap
898 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
900 pred &= (-1)<<(8-s->bits);
901 *ptr = pred + (dc << point_transform);
903 ptr16 = s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x); //FIXME optimize this crap
904 PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
906 pred &= (-1)<<(16-s->bits);
907 *ptr16= pred + (dc << point_transform);
917 if (s->restart_interval && !--s->restart_count) {
918 align_get_bits(&s->gb);
919 skip_bits(&s->gb, 16); /* skip RSTn */
926 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
927 int linesize, int lowres)
930 case 0: copy_block8(dst, src, linesize, linesize, 8);
932 case 1: copy_block4(dst, src, linesize, linesize, 4);
934 case 2: copy_block2(dst, src, linesize, linesize, 2);
941 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
942 int Al, const uint8_t *mb_bitmask,
943 const AVFrame *reference)
946 uint8_t *data[MAX_COMPONENTS];
947 const uint8_t *reference_data[MAX_COMPONENTS];
948 int linesize[MAX_COMPONENTS];
949 GetBitContext mb_bitmask_gb;
952 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
954 if (s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
955 av_log(s->avctx, AV_LOG_ERROR,
956 "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
960 for (i = 0; i < nb_components; i++) {
961 int c = s->comp_index[i];
962 data[c] = s->picture_ptr->data[c];
963 reference_data[c] = reference ? reference->data[c] : NULL;
964 linesize[c] = s->linesize[c];
965 s->coefs_finished[c] |= 1;
967 // picture should be flipped upside-down for this codec
968 int offset = (linesize[c] * (s->v_scount[i] *
969 (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
971 reference_data[c] += offset;
976 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
977 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
978 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
980 if (s->restart_interval && !s->restart_count)
981 s->restart_count = s->restart_interval;
983 if (get_bits_count(&s->gb)>s->gb.size_in_bits) {
984 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
985 get_bits_count(&s->gb) - s->gb.size_in_bits);
988 for (i = 0; i < nb_components; i++) {
990 int n, h, v, x, y, c, j;
993 c = s->comp_index[i];
998 for (j = 0; j < n; j++) {
999 block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
1000 (h * mb_x + x) * 8) >> s->avctx->lowres);
1002 if (s->interlaced && s->bottom_field)
1003 block_offset += linesize[c] >> 1;
1004 ptr = data[c] + block_offset;
1005 if (!s->progressive) {
1007 mjpeg_copy_block(ptr, reference_data[c] + block_offset,
1008 linesize[c], s->avctx->lowres);
1010 s->dsp.clear_block(s->block);
1011 if (decode_block(s, s->block, i,
1012 s->dc_index[i], s->ac_index[i],
1013 s->quant_matrixes[s->quant_index[c]]) < 0) {
1014 av_log(s->avctx, AV_LOG_ERROR,
1015 "error y=%d x=%d\n", mb_y, mb_x);
1018 s->dsp.idct_put(ptr, linesize[c], s->block);
1021 int block_idx = s->block_stride[c] * (v * mb_y + y) +
1023 DCTELEM *block = s->blocks[c][block_idx];
1025 block[0] += get_bits1(&s->gb) *
1026 s->quant_matrixes[s->quant_index[c]][0] << Al;
1027 else if (decode_dc_progressive(s, block, i, s->dc_index[i],
1028 s->quant_matrixes[s->quant_index[c]],
1030 av_log(s->avctx, AV_LOG_ERROR,
1031 "error y=%d x=%d\n", mb_y, mb_x);
1035 // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n",
1037 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n",
1038 // mb_x, mb_y, x, y, c, s->bottom_field,
1039 // (v * mb_y + y) * 8, (h * mb_x + x) * 8);
1047 if (s->restart_interval) {
1049 if(s->restart_count == 0 && s->avctx->codec_id == CODEC_ID_THP){
1050 align_get_bits(&s->gb);
1051 for (i = 0; i < nb_components; i++) /* reset dc */
1052 s->last_dc[i] = 1024;
1055 i = 8 + ((-get_bits_count(&s->gb)) & 7);
1057 if (show_bits(&s->gb, i) == (1 << i) - 1) {
1058 int pos = get_bits_count(&s->gb);
1059 align_get_bits(&s->gb);
1060 while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
1061 skip_bits(&s->gb, 8);
1062 if (get_bits_left(&s->gb) >= 8 && (get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
1063 for (i = 0; i < nb_components; i++) /* reset dc */
1064 s->last_dc[i] = 1024;
1066 skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
1074 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
1075 int se, int Ah, int Al)
1079 int c = s->comp_index[0];
1080 uint8_t *data = s->picture.data[c];
1081 int linesize = s->linesize[c];
1083 int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
1086 s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
1087 last_scan = !~s->coefs_finished[c];
1090 if (s->interlaced && s->bottom_field)
1091 data += linesize >> 1;
1093 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1094 uint8_t *ptr = data + (mb_y * linesize * 8 >> s->avctx->lowres);
1095 int block_idx = mb_y * s->block_stride[c];
1096 DCTELEM (*block)[64] = &s->blocks[c][block_idx];
1097 uint8_t *last_nnz = &s->last_nnz[c][block_idx];
1098 for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
1101 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
1102 quant_matrix, ss, se, Al, &EOBRUN);
1104 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
1105 quant_matrix, ss, se, Al, &EOBRUN);
1107 av_log(s->avctx, AV_LOG_ERROR,
1108 "error y=%d x=%d\n", mb_y, mb_x);
1113 s->dsp.idct_put(ptr, linesize, *block);
1114 ptr += 8 >> s->avctx->lowres;
1121 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
1122 const AVFrame *reference)
1124 int len, nb_components, i, h, v, predictor, point_transform;
1126 const int block_size = s->lossless ? 1 : 8;
1127 int ilv, prev_shift;
1129 /* XXX: verify len field validity */
1130 len = get_bits(&s->gb, 16);
1131 nb_components = get_bits(&s->gb, 8);
1132 if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
1133 av_log(s->avctx, AV_LOG_ERROR,
1134 "decode_sos: nb_components (%d) unsupported\n", nb_components);
1137 if (len != 6 + 2 * nb_components) {
1138 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1141 for (i = 0; i < nb_components; i++) {
1142 id = get_bits(&s->gb, 8) - 1;
1143 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1144 /* find component index */
1145 for (index = 0; index < s->nb_components; index++)
1146 if (id == s->component_id[index])
1148 if (index == s->nb_components) {
1149 av_log(s->avctx, AV_LOG_ERROR,
1150 "decode_sos: index(%d) out of components\n", index);
1153 /* Metasoft MJPEG codec has Cb and Cr swapped */
1154 if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1155 && nb_components == 3 && s->nb_components == 3 && i)
1158 if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == PIX_FMT_GBR24P)
1161 s->comp_index[i] = index;
1163 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1164 s->h_scount[i] = s->h_count[index];
1165 s->v_scount[i] = s->v_count[index];
1167 s->dc_index[i] = get_bits(&s->gb, 4);
1168 s->ac_index[i] = get_bits(&s->gb, 4);
1170 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1171 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1173 if (!s->vlcs[0][s->dc_index[i]].table || !(s->progressive ? s->vlcs[2][s->ac_index[0]].table : s->vlcs[1][s->ac_index[i]].table))
1177 predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1178 ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1179 if(s->avctx->codec_tag != AV_RL32("CJPG")){
1180 prev_shift = get_bits(&s->gb, 4); /* Ah */
1181 point_transform = get_bits(&s->gb, 4); /* Al */
1183 prev_shift = point_transform = 0;
1185 for (i = 0; i < nb_components; i++)
1186 s->last_dc[i] = 1024;
1188 if (nb_components > 1) {
1189 /* interleaved stream */
1190 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1191 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1192 } else if (!s->ls) { /* skip this for JPEG-LS */
1193 h = s->h_max / s->h_scount[0];
1194 v = s->v_max / s->v_scount[0];
1195 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1196 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1197 s->nb_blocks[0] = 1;
1202 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1203 av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n",
1204 s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1205 predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
1206 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
1209 /* mjpeg-b can have padding bytes between sos and image data, skip them */
1210 for (i = s->mjpb_skiptosod; i > 0; i--)
1211 skip_bits(&s->gb, 8);
1214 av_assert0(s->picture_ptr == &s->picture);
1215 if (CONFIG_JPEGLS_DECODER && s->ls) {
1217 // reset_ls_coding_parameters(s, 0);
1219 if (ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
1223 if (ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform) < 0)
1226 if (ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
1231 if (s->progressive && predictor) {
1232 av_assert0(s->picture_ptr == &s->picture);
1233 if (mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift,
1234 point_transform) < 0)
1237 if (mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
1238 mb_bitmask, reference) < 0)
1245 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1249 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1251 if (get_bits(&s->gb, 16) != 4)
1253 s->restart_interval = get_bits(&s->gb, 16);
1254 s->restart_count = 0;
1255 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
1256 s->restart_interval);
1261 static int mjpeg_decode_app(MJpegDecodeContext *s)
1265 len = get_bits(&s->gb, 16);
1268 if (8 * len + get_bits_count(&s->gb) > s->gb.size_in_bits)
1271 id = get_bits_long(&s->gb, 32);
1272 id = av_be2ne32(id);
1275 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1276 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1278 /* Buggy AVID, it puts EOI only at every 10th frame. */
1279 /* Also, this fourcc is used by non-avid files too, it holds some
1280 information, but it's always present in AVID-created files. */
1281 if (id == AV_RL32("AVI1")) {
1287 4bytes field_size_less_padding
1290 // if (s->first_picture)
1291 // printf("mjpeg: workarounding buggy AVID\n");
1292 i = get_bits(&s->gb, 8); len--;
1293 av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
1295 skip_bits(&s->gb, 8);
1296 skip_bits(&s->gb, 32);
1297 skip_bits(&s->gb, 32);
1300 // if (s->interlace_polarity)
1301 // printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
1307 if (id == AV_RL32("JFIF")) {
1308 int t_w, t_h, v1, v2;
1309 skip_bits(&s->gb, 8); /* the trailing zero-byte */
1310 v1 = get_bits(&s->gb, 8);
1311 v2 = get_bits(&s->gb, 8);
1312 skip_bits(&s->gb, 8);
1314 s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
1315 s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
1317 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1318 av_log(s->avctx, AV_LOG_INFO,
1319 "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1321 s->avctx->sample_aspect_ratio.num,
1322 s->avctx->sample_aspect_ratio.den);
1324 t_w = get_bits(&s->gb, 8);
1325 t_h = get_bits(&s->gb, 8);
1327 /* skip thumbnail */
1328 if (len -10 - (t_w * t_h * 3) > 0)
1329 len -= t_w * t_h * 3;
1335 if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
1336 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1337 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1338 skip_bits(&s->gb, 16); /* version */
1339 skip_bits(&s->gb, 16); /* flags0 */
1340 skip_bits(&s->gb, 16); /* flags1 */
1341 skip_bits(&s->gb, 8); /* transform */
1346 if (id == AV_RL32("LJIF")) {
1347 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1348 av_log(s->avctx, AV_LOG_INFO,
1349 "Pegasus lossless jpeg header found\n");
1350 skip_bits(&s->gb, 16); /* version ? */
1351 skip_bits(&s->gb, 16); /* unknwon always 0? */
1352 skip_bits(&s->gb, 16); /* unknwon always 0? */
1353 skip_bits(&s->gb, 16); /* unknwon always 0? */
1354 switch (get_bits(&s->gb, 8)) {
1364 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1371 if ((s->start_code == APP1) && (len > (0x28 - 8))) {
1372 id = get_bits_long(&s->gb, 32);
1373 id = av_be2ne32(id);
1376 if (id == AV_RL32("mjpg")) {
1378 skip_bits(&s->gb, 32); /* field size */
1379 skip_bits(&s->gb, 32); /* pad field size */
1380 skip_bits(&s->gb, 32); /* next off */
1381 skip_bits(&s->gb, 32); /* quant off */
1382 skip_bits(&s->gb, 32); /* huff off */
1383 skip_bits(&s->gb, 32); /* image off */
1384 skip_bits(&s->gb, 32); /* scan off */
1385 skip_bits(&s->gb, 32); /* data off */
1387 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1388 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1393 /* slow but needed for extreme adobe jpegs */
1395 av_log(s->avctx, AV_LOG_ERROR,
1396 "mjpeg: error, decode_app parser read over the end\n");
1398 skip_bits(&s->gb, 8);
1403 static int mjpeg_decode_com(MJpegDecodeContext *s)
1405 int len = get_bits(&s->gb, 16);
1407 8 * len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
1408 char *cbuf = av_malloc(len - 1);
1411 for (i = 0; i < len - 2; i++)
1412 cbuf[i] = get_bits(&s->gb, 8);
1413 if (i > 0 && cbuf[i - 1] == '\n')
1418 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1419 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1421 /* buggy avid, it puts EOI only at every 10th frame */
1422 if (!strcmp(cbuf, "AVID")) {
1424 // if (s->first_picture)
1425 // printf("mjpeg: workarounding buggy AVID\n");
1426 } else if (!strcmp(cbuf, "CS=ITU601"))
1428 else if ((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
1429 (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
1439 /* return the 8 bit start code value and update the search
1440 state. Return -1 if no start code found */
1441 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1443 const uint8_t *buf_ptr;
1448 buf_ptr = *pbuf_ptr;
1449 while (buf_ptr < buf_end) {
1452 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1460 av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1461 *pbuf_ptr = buf_ptr;
1465 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1466 const uint8_t **buf_ptr, const uint8_t *buf_end,
1467 const uint8_t **unescaped_buf_ptr,
1468 int *unescaped_buf_size)
1471 start_code = find_marker(buf_ptr, buf_end);
1473 av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
1475 return AVERROR(ENOMEM);
1477 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1478 if (start_code == SOS && !s->ls) {
1479 const uint8_t *src = *buf_ptr;
1480 uint8_t *dst = s->buffer;
1482 while (src < buf_end) {
1483 uint8_t x = *(src++);
1486 if (s->avctx->codec_id != CODEC_ID_THP) {
1488 while (src < buf_end && x == 0xff)
1491 if (x >= 0xd0 && x <= 0xd7)
1498 *unescaped_buf_ptr = s->buffer;
1499 *unescaped_buf_size = dst - s->buffer;
1501 av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1502 (buf_end - *buf_ptr) - (dst - s->buffer));
1503 } else if (start_code == SOS && s->ls) {
1504 const uint8_t *src = *buf_ptr;
1505 uint8_t *dst = s->buffer;
1513 while (src + t < buf_end) {
1514 uint8_t x = src[t++];
1516 while ((src + t < buf_end) && x == 0xff)
1525 init_put_bits(&pb, dst, t);
1527 /* unescape bitstream */
1529 uint8_t x = src[b++];
1530 put_bits(&pb, 8, x);
1533 put_bits(&pb, 7, x);
1537 flush_put_bits(&pb);
1539 *unescaped_buf_ptr = dst;
1540 *unescaped_buf_size = (bit_count + 7) >> 3;
1542 *unescaped_buf_ptr = *buf_ptr;
1543 *unescaped_buf_size = buf_end - *buf_ptr;
1549 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
1552 const uint8_t *buf = avpkt->data;
1553 int buf_size = avpkt->size;
1554 MJpegDecodeContext *s = avctx->priv_data;
1555 const uint8_t *buf_end, *buf_ptr;
1556 const uint8_t *unescaped_buf_ptr;
1557 int unescaped_buf_size;
1560 AVFrame *picture = data;
1562 s->got_picture = 0; // picture from previous image can not be reused
1564 buf_end = buf + buf_size;
1565 while (buf_ptr < buf_end) {
1566 /* find start next marker */
1567 start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1569 &unescaped_buf_size);
1571 if (start_code < 0) {
1574 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
1575 start_code, buf_end - buf_ptr);
1577 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
1579 s->start_code = start_code;
1580 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1581 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1583 /* process markers */
1584 if (start_code >= 0xd0 && start_code <= 0xd7)
1585 av_log(avctx, AV_LOG_DEBUG,
1586 "restart marker: %d\n", start_code & 0x0f);
1588 else if (start_code >= APP0 && start_code <= APP15)
1589 mjpeg_decode_app(s);
1591 else if (start_code == COM)
1592 mjpeg_decode_com(s);
1594 switch (start_code) {
1596 s->restart_interval = 0;
1597 s->restart_count = 0;
1598 /* nothing to do on SOI */
1601 ff_mjpeg_decode_dqt(s);
1604 if (ff_mjpeg_decode_dht(s) < 0) {
1605 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1614 if (ff_mjpeg_decode_sof(s) < 0)
1621 if (ff_mjpeg_decode_sof(s) < 0)
1628 if (ff_mjpeg_decode_sof(s) < 0)
1635 if (ff_mjpeg_decode_sof(s) < 0)
1639 if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
1645 if (!s->got_picture) {
1646 av_log(avctx, AV_LOG_WARNING,
1647 "Found EOI before any SOF, ignoring\n");
1650 if (s->interlaced) {
1651 s->bottom_field ^= 1;
1652 /* if not bottom field, do not output image yet */
1653 if (s->bottom_field == !s->interlace_polarity)
1656 *picture = *s->picture_ptr;
1657 *data_size = sizeof(AVFrame);
1660 picture->quality = FFMAX3(s->qscale[0],
1663 picture->qstride = 0;
1664 picture->qscale_table = s->qscale_table;
1665 memset(picture->qscale_table, picture->quality,
1666 (s->width + 15) / 16);
1667 if (avctx->debug & FF_DEBUG_QP)
1668 av_log(avctx, AV_LOG_DEBUG,
1669 "QP: %d\n", picture->quality);
1670 picture->quality *= FF_QP2LAMBDA;
1675 if (!s->got_picture) {
1676 av_log(avctx, AV_LOG_WARNING,
1677 "Can not process SOS before SOF, skipping\n");
1680 if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
1681 (avctx->err_recognition & AV_EF_EXPLODE))
1682 return AVERROR_INVALIDDATA;
1685 mjpeg_decode_dri(s);
1697 av_log(avctx, AV_LOG_ERROR,
1698 "mjpeg: unsupported coding type (%x)\n", start_code);
1701 // printf("mjpeg: unsupported marker (%x)\n", start_code);
1705 /* eof process start code */
1706 buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
1707 av_log(avctx, AV_LOG_DEBUG,
1708 "marker parser used %d bytes (%d bits)\n",
1709 (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
1712 if (s->got_picture) {
1713 av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1716 av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1720 uint8_t *line = s->picture_ptr->data[s->upscale_h];
1721 av_assert0(avctx->pix_fmt == PIX_FMT_YUVJ444P ||
1722 avctx->pix_fmt == PIX_FMT_YUV444P ||
1723 avctx->pix_fmt == PIX_FMT_YUVJ440P ||
1724 avctx->pix_fmt == PIX_FMT_YUV440P);
1725 for (i = 0; i < s->chroma_height; i++) {
1726 for (index = s->width - 1; index; index--)
1727 line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
1728 line += s->linesize[s->upscale_h];
1732 uint8_t *dst = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(s->height - 1) * s->linesize[s->upscale_v]];
1733 av_assert0(avctx->pix_fmt == PIX_FMT_YUVJ444P ||
1734 avctx->pix_fmt == PIX_FMT_YUV444P ||
1735 avctx->pix_fmt == PIX_FMT_YUVJ422P ||
1736 avctx->pix_fmt == PIX_FMT_YUV422P);
1737 for (i = s->height - 1; i; i--) {
1738 uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[i / 2 * s->linesize[s->upscale_v]];
1739 uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(i + 1) / 2 * s->linesize[s->upscale_v]];
1741 memcpy(dst, src1, s->width);
1743 for (index = 0; index < s->width; index++)
1744 dst[index] = (src1[index] + src2[index]) >> 1;
1746 dst -= s->linesize[s->upscale_v];
1749 av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n",
1751 // return buf_end - buf_ptr;
1752 return buf_ptr - buf;
1755 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1757 MJpegDecodeContext *s = avctx->priv_data;
1760 if (s->picture_ptr && s->picture_ptr->data[0])
1761 avctx->release_buffer(avctx, s->picture_ptr);
1764 av_free(s->qscale_table);
1765 av_freep(&s->ljpeg_buffer);
1766 s->ljpeg_buffer_size = 0;
1768 for (i = 0; i < 3; i++) {
1769 for (j = 0; j < 4; j++)
1770 free_vlc(&s->vlcs[i][j]);
1772 for (i = 0; i < MAX_COMPONENTS; i++) {
1773 av_freep(&s->blocks[i]);
1774 av_freep(&s->last_nnz[i]);
1779 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1780 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1781 static const AVOption options[] = {
1782 { "extern_huff", "Use external huffman table.",
1783 OFFSET(extern_huff), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD },
1787 static const AVClass mjpegdec_class = {
1788 .class_name = "MJPEG decoder",
1789 .item_name = av_default_item_name,
1791 .version = LIBAVUTIL_VERSION_INT,
1794 AVCodec ff_mjpeg_decoder = {
1796 .type = AVMEDIA_TYPE_VIDEO,
1797 .id = CODEC_ID_MJPEG,
1798 .priv_data_size = sizeof(MJpegDecodeContext),
1799 .init = ff_mjpeg_decode_init,
1800 .close = ff_mjpeg_decode_end,
1801 .decode = ff_mjpeg_decode_frame,
1802 .capabilities = CODEC_CAP_DR1,
1804 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1805 .priv_class = &mjpegdec_class,
1808 AVCodec ff_thp_decoder = {
1810 .type = AVMEDIA_TYPE_VIDEO,
1812 .priv_data_size = sizeof(MJpegDecodeContext),
1813 .init = ff_mjpeg_decode_init,
1814 .close = ff_mjpeg_decode_end,
1815 .decode = ff_mjpeg_decode_frame,
1816 .capabilities = CODEC_CAP_DR1,
1818 .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),