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
33 #include "libavutil/imgutils.h"
34 #include "libavutil/avassert.h"
35 #include "libavutil/opt.h"
40 #include "jpeglsdec.h"
43 static int build_vlc(VLC *vlc, const uint8_t *bits_table,
44 const uint8_t *val_table, int nb_codes,
45 int use_static, int is_ac)
47 uint8_t huff_size[256] = { 0 };
48 uint16_t huff_code[256];
49 uint16_t huff_sym[256];
52 av_assert0(nb_codes <= 256);
54 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
56 for (i = 0; i < 256; i++)
57 huff_sym[i] = i + 16 * is_ac;
60 huff_sym[0] = 16 * 256;
62 return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
63 huff_code, 2, 2, huff_sym, 2, 2, use_static);
66 static void build_basic_mjpeg_vlc(MJpegDecodeContext *s)
68 build_vlc(&s->vlcs[0][0], avpriv_mjpeg_bits_dc_luminance,
69 avpriv_mjpeg_val_dc, 12, 0, 0);
70 build_vlc(&s->vlcs[0][1], avpriv_mjpeg_bits_dc_chrominance,
71 avpriv_mjpeg_val_dc, 12, 0, 0);
72 build_vlc(&s->vlcs[1][0], avpriv_mjpeg_bits_ac_luminance,
73 avpriv_mjpeg_val_ac_luminance, 251, 0, 1);
74 build_vlc(&s->vlcs[1][1], avpriv_mjpeg_bits_ac_chrominance,
75 avpriv_mjpeg_val_ac_chrominance, 251, 0, 1);
76 build_vlc(&s->vlcs[2][0], avpriv_mjpeg_bits_ac_luminance,
77 avpriv_mjpeg_val_ac_luminance, 251, 0, 0);
78 build_vlc(&s->vlcs[2][1], avpriv_mjpeg_bits_ac_chrominance,
79 avpriv_mjpeg_val_ac_chrominance, 251, 0, 0);
82 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
84 MJpegDecodeContext *s = avctx->priv_data;
87 s->picture_ptr = &s->picture;
88 avcodec_get_frame_defaults(&s->picture);
91 ff_dsputil_init(&s->dsp, avctx);
92 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
97 s->org_height = avctx->coded_height;
98 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
100 build_basic_mjpeg_vlc(s);
102 if (s->extern_huff) {
103 av_log(avctx, AV_LOG_INFO, "using external huffman table\n");
104 init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
105 if (ff_mjpeg_decode_dht(s)) {
106 av_log(avctx, AV_LOG_ERROR,
107 "error using external huffman table, switching back to internal\n");
108 build_basic_mjpeg_vlc(s);
111 if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
112 s->interlace_polarity = 1; /* bottom field first */
113 av_log(avctx, AV_LOG_DEBUG, "bottom field first\n");
115 if (avctx->codec->id == AV_CODEC_ID_AMV)
122 /* quantize tables */
123 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
125 int len, index, i, j;
127 len = get_bits(&s->gb, 16) - 2;
130 /* only 8 bit precision handled */
131 if (get_bits(&s->gb, 4) != 0) {
132 av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
135 index = get_bits(&s->gb, 4);
138 av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
139 /* read quant table */
140 for (i = 0; i < 64; i++) {
141 j = s->scantable.permutated[i];
142 s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
145 // XXX FIXME finetune, and perhaps add dc too
146 s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
147 s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
148 av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
149 index, s->qscale[index]);
155 /* decode huffman tables and build VLC decoders */
156 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
158 int len, index, i, class, n, v, code_max;
159 uint8_t bits_table[17];
160 uint8_t val_table[256];
163 len = get_bits(&s->gb, 16) - 2;
167 return AVERROR_INVALIDDATA;
168 class = get_bits(&s->gb, 4);
170 return AVERROR_INVALIDDATA;
171 index = get_bits(&s->gb, 4);
173 return AVERROR_INVALIDDATA;
175 for (i = 1; i <= 16; i++) {
176 bits_table[i] = get_bits(&s->gb, 8);
180 if (len < n || n > 256)
181 return AVERROR_INVALIDDATA;
184 for (i = 0; i < n; i++) {
185 v = get_bits(&s->gb, 8);
192 /* build VLC and flush previous vlc if present */
193 ff_free_vlc(&s->vlcs[class][index]);
194 av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
195 class, index, code_max + 1);
196 if ((ret = build_vlc(&s->vlcs[class][index], bits_table, val_table,
197 code_max + 1, 0, class > 0)) < 0)
201 ff_free_vlc(&s->vlcs[2][index]);
202 if ((ret = build_vlc(&s->vlcs[2][index], bits_table, val_table,
203 code_max + 1, 0, 0)) < 0)
210 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
212 int len, nb_components, i, width, height, pix_fmt_id;
215 s->upscale_h = s->upscale_v = 0;
217 /* XXX: verify len field validity */
218 len = get_bits(&s->gb, 16);
219 s->bits = get_bits(&s->gb, 8);
223 if (s->bits == 9 && !s->pegasus_rct)
224 s->rct = 1; // FIXME ugly
226 if (s->bits != 8 && !s->lossless) {
227 av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
231 if(s->lossless && s->avctx->lowres){
232 av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
236 height = get_bits(&s->gb, 16);
237 width = get_bits(&s->gb, 16);
239 // HACK for odd_height.mov
240 if (s->interlaced && s->width == width && s->height == height + 1)
243 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
244 if (av_image_check_size(width, height, 0, s->avctx))
245 return AVERROR_INVALIDDATA;
247 nb_components = get_bits(&s->gb, 8);
248 if (nb_components <= 0 ||
249 nb_components > MAX_COMPONENTS)
251 if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
252 if (nb_components != s->nb_components) {
253 av_log(s->avctx, AV_LOG_ERROR, "nb_components changing in interlaced picture\n");
254 return AVERROR_INVALIDDATA;
257 if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
258 av_log_missing_feature(s->avctx,
259 "only <= 8 bits/component or "
260 "16-bit gray accepted for JPEG-LS\n", 0);
261 return AVERROR_PATCHWELCOME;
263 s->nb_components = nb_components;
266 for (i = 0; i < nb_components; i++) {
268 s->component_id[i] = get_bits(&s->gb, 8) - 1;
269 s->h_count[i] = get_bits(&s->gb, 4);
270 s->v_count[i] = get_bits(&s->gb, 4);
271 /* compute hmax and vmax (only used in interleaved case) */
272 if (s->h_count[i] > s->h_max)
273 s->h_max = s->h_count[i];
274 if (s->v_count[i] > s->v_max)
275 s->v_max = s->v_count[i];
276 if (!s->h_count[i] || !s->v_count[i]) {
277 av_log(s->avctx, AV_LOG_ERROR, "h/v_count is 0\n");
280 s->quant_index[i] = get_bits(&s->gb, 8);
281 if (s->quant_index[i] >= 4)
282 return AVERROR_INVALIDDATA;
283 av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
284 i, s->h_count[i], s->v_count[i],
285 s->component_id[i], s->quant_index[i]);
288 if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
289 av_log_missing_feature(s->avctx,
290 "Subsampling in JPEG-LS is not supported.\n", 0);
291 return AVERROR_PATCHWELCOME;
294 if (s->v_max == 1 && s->h_max == 1 && s->lossless==1 && nb_components==3)
297 /* if different size, realloc/alloc picture */
298 /* XXX: also check h_count and v_count */
299 if (width != s->width || height != s->height) {
300 av_freep(&s->qscale_table);
306 /* test interlaced mode */
307 if (s->first_picture &&
308 s->org_height != 0 &&
309 s->height < ((s->org_height * 3) / 4)) {
311 s->bottom_field = s->interlace_polarity;
312 s->picture_ptr->interlaced_frame = 1;
313 s->picture_ptr->top_field_first = !s->interlace_polarity;
317 avcodec_set_dimensions(s->avctx, width, height);
319 s->qscale_table = av_mallocz((s->width + 15) / 16);
320 s->first_picture = 0;
323 if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
324 if (s->progressive) {
325 av_log_ask_for_sample(s->avctx, "progressively coded interlaced pictures not supported\n");
326 return AVERROR_INVALIDDATA;
329 /* XXX: not complete test ! */
330 pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
331 (s->h_count[1] << 20) | (s->v_count[1] << 16) |
332 (s->h_count[2] << 12) | (s->v_count[2] << 8) |
333 (s->h_count[3] << 4) | s->v_count[3];
334 av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
335 /* NOTE we do not allocate pictures large enough for the possible
336 * padding of h/v_count being 4 */
337 if (!(pix_fmt_id & 0xD0D0D0D0))
338 pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
339 if (!(pix_fmt_id & 0x0D0D0D0D))
340 pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
342 switch (pix_fmt_id) {
345 s->avctx->pix_fmt = PIX_FMT_BGR24;
347 if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
348 s->avctx->pix_fmt = PIX_FMT_GBR24P;
350 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
351 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
354 av_assert0(s->nb_components == 3);
358 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
359 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
361 s->upscale_h = (pix_fmt_id == 0x22122100);
362 s->chroma_height = s->height;
366 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
367 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
368 s->upscale_v = (pix_fmt_id == 0x22211200);
370 s->chroma_height = s->height;
373 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
374 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
377 s->chroma_height = s->height / 2;
381 s->avctx->pix_fmt = PIX_FMT_GRAY8;
383 s->avctx->pix_fmt = PIX_FMT_GRAY16;
388 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
389 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
390 s->upscale_h = (pix_fmt_id == 0x22211100) * 2 + (pix_fmt_id == 0x22112100);
391 s->chroma_height = s->height / 2;
394 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
395 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
399 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
400 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
401 s->upscale_v = (pix_fmt_id == 0x22121100) + 1;
404 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
405 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
408 av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
409 return AVERROR_PATCHWELCOME;
411 if ((s->upscale_h || s->upscale_v) && s->avctx->lowres) {
412 av_log(s->avctx, AV_LOG_ERROR, "lowres not supported for weird subsampling\n");
413 return AVERROR_PATCHWELCOME;
416 s->upscale_h = s->upscale_v = 0;
417 if (s->nb_components > 1)
418 s->avctx->pix_fmt = PIX_FMT_RGB24;
419 else if (s->bits <= 8)
420 s->avctx->pix_fmt = PIX_FMT_GRAY8;
422 s->avctx->pix_fmt = PIX_FMT_GRAY16;
425 if (s->picture_ptr->data[0])
426 s->avctx->release_buffer(s->avctx, s->picture_ptr);
428 if (s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0) {
429 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
432 s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
433 s->picture_ptr->key_frame = 1;
436 for (i = 0; i < 3; i++)
437 s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
439 av_dlog(s->avctx, "%d %d %d %d %d %d\n",
440 s->width, s->height, s->linesize[0], s->linesize[1],
441 s->interlaced, s->avctx->height);
443 if (len != (8 + (3 * nb_components)))
444 av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
447 /* totally blank picture as progressive JPEG will only add details to it */
448 if (s->progressive) {
449 int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
450 int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
451 for (i = 0; i < s->nb_components; i++) {
452 int size = bw * bh * s->h_count[i] * s->v_count[i];
453 av_freep(&s->blocks[i]);
454 av_freep(&s->last_nnz[i]);
455 s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
456 s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
457 s->block_stride[i] = bw * s->h_count[i];
459 memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
464 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
467 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
469 av_log(s->avctx, AV_LOG_WARNING,
470 "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
471 0, dc_index, &s->vlcs[0][dc_index]);
476 return get_xbits(&s->gb, code);
481 /* decode block and dequantize */
482 static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,
483 int dc_index, int ac_index, int16_t *quant_matrix)
485 int code, i, j, level, val;
488 val = mjpeg_decode_dc(s, dc_index);
490 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
491 return AVERROR_INVALIDDATA;
493 val = val * quant_matrix[0] + s->last_dc[component];
494 s->last_dc[component] = val;
498 {OPEN_READER(re, &s->gb);
500 UPDATE_CACHE(re, &s->gb);
501 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
503 i += ((unsigned)code) >> 4;
506 if (code > MIN_CACHE_BITS - 16)
507 UPDATE_CACHE(re, &s->gb);
510 int cache = GET_CACHE(re, &s->gb);
511 int sign = (~cache) >> 31;
512 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
515 LAST_SKIP_BITS(re, &s->gb, code);
518 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
519 return AVERROR_INVALIDDATA;
521 j = s->scantable.permutated[i];
522 block[j] = level * quant_matrix[j];
525 CLOSE_READER(re, &s->gb);}
530 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block,
531 int component, int dc_index,
532 int16_t *quant_matrix, int Al)
535 s->dsp.clear_block(block);
536 val = mjpeg_decode_dc(s, dc_index);
538 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
539 return AVERROR_INVALIDDATA;
541 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
542 s->last_dc[component] = val;
547 /* decode block and dequantize - progressive JPEG version */
548 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
549 uint8_t *last_nnz, int ac_index,
550 int16_t *quant_matrix,
551 int ss, int se, int Al, int *EOBRUN)
553 int code, i, j, level, val, run;
561 OPEN_READER(re, &s->gb);
562 for (i = ss; ; i++) {
563 UPDATE_CACHE(re, &s->gb);
564 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
566 run = ((unsigned) code) >> 4;
570 if (code > MIN_CACHE_BITS - 16)
571 UPDATE_CACHE(re, &s->gb);
574 int cache = GET_CACHE(re, &s->gb);
575 int sign = (~cache) >> 31;
576 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
579 LAST_SKIP_BITS(re, &s->gb, code);
583 j = s->scantable.permutated[se];
584 block[j] = level * quant_matrix[j] << Al;
587 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
588 return AVERROR_INVALIDDATA;
590 j = s->scantable.permutated[i];
591 block[j] = level * quant_matrix[j] << Al;
593 if (run == 0xF) {// ZRL - skip 15 coefficients
596 av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
597 return AVERROR_INVALIDDATA;
602 UPDATE_CACHE(re, &s->gb);
603 val += NEG_USR32(GET_CACHE(re, &s->gb), run);
604 LAST_SKIP_BITS(re, &s->gb, run);
611 CLOSE_READER(re, &s->gb);
620 #define REFINE_BIT(j) { \
621 UPDATE_CACHE(re, &s->gb); \
622 sign = block[j] >> 15; \
623 block[j] += SHOW_UBITS(re, &s->gb, 1) * \
624 ((quant_matrix[j] ^ sign) - sign) << Al; \
625 LAST_SKIP_BITS(re, &s->gb, 1); \
633 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
638 j = s->scantable.permutated[i]; \
641 else if (run-- == 0) \
645 /* decode block and dequantize - progressive JPEG refinement pass */
646 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block,
648 int ac_index, int16_t *quant_matrix,
649 int ss, int se, int Al, int *EOBRUN)
651 int code, i = ss, j, sign, val, run;
652 int last = FFMIN(se, *last_nnz);
654 OPEN_READER(re, &s->gb);
659 UPDATE_CACHE(re, &s->gb);
660 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
663 run = ((unsigned) code) >> 4;
664 UPDATE_CACHE(re, &s->gb);
665 val = SHOW_UBITS(re, &s->gb, 1);
666 LAST_SKIP_BITS(re, &s->gb, 1);
668 j = s->scantable.permutated[i];
670 block[j] = ((quant_matrix[j]^val) - val) << Al;
674 CLOSE_READER(re, &s->gb);
678 run = ((unsigned) code) >> 4;
685 UPDATE_CACHE(re, &s->gb);
686 run += SHOW_UBITS(re, &s->gb, val);
687 LAST_SKIP_BITS(re, &s->gb, val);
699 for (; i <= last; i++) {
700 j = s->scantable.permutated[i];
704 CLOSE_READER(re, &s->gb);
711 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int predictor, int point_transform)
714 uint16_t (*buffer)[4];
715 int left[3], top[3], topleft[3];
716 const int linesize = s->linesize[0];
717 const int mask = (1 << s->bits) - 1;
721 s->restart_count = s->restart_interval;
723 av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
724 (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
725 buffer = s->ljpeg_buffer;
727 for (i = 0; i < 3; i++)
728 buffer[0][i] = 1 << (s->bits - 1);
730 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
731 uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
733 if (s->interlaced && s->bottom_field)
734 ptr += linesize >> 1;
736 for (i = 0; i < 3; i++)
737 top[i] = left[i] = topleft[i] = buffer[0][i];
739 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
740 int modified_predictor = predictor;
742 if (s->restart_interval && !s->restart_count){
743 s->restart_count = s->restart_interval;
747 top[i] = left[i]= topleft[i]= 1 << (s->bits - 1);
749 if (mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || !mb_x)
750 modified_predictor = 1;
752 for (i=0;i<nb_components;i++) {
756 top[i] = buffer[mb_x][i];
758 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
760 dc = mjpeg_decode_dc(s, s->dc_index[i]);
764 left[i] = buffer[mb_x][i] =
765 mask & (pred + (dc << point_transform));
768 if (s->restart_interval && !--s->restart_count) {
769 align_get_bits(&s->gb);
770 skip_bits(&s->gb, 16); /* skip RSTn */
775 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
776 ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
777 ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
778 ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
780 } else if (s->pegasus_rct) {
781 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
782 ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
783 ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
784 ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
787 for(i=0; i<nb_components; i++) {
788 int c= s->comp_index[i];
789 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
790 ptr[3*mb_x+2-c] = buffer[mb_x][i];
798 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
802 const int nb_components=s->nb_components;
803 int bits= (s->bits+7)&~7;
807 point_transform += bits - s->bits;
809 av_assert0(nb_components==1 || nb_components==3);
811 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
812 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
813 if (s->restart_interval && !s->restart_count){
814 s->restart_count = s->restart_interval;
819 if(!mb_x || mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || s->interlaced){
820 int toprow = mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x;
821 int leftcol = !mb_x || mb_y == resync_mb_y && mb_x == resync_mb_x;
822 for (i = 0; i < nb_components; i++) {
825 int n, h, v, x, y, c, j, linesize;
827 c = s->comp_index[i];
832 linesize= s->linesize[c];
834 if(bits>8) linesize /= 2;
839 dc = mjpeg_decode_dc(s, s->dc_index[i]);
843 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
846 pred= 1 << (bits - 1);
852 pred= ptr[-linesize];
854 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
858 if (s->interlaced && s->bottom_field)
859 ptr += linesize >> 1;
860 pred &= (-1)<<(8-s->bits);
861 *ptr= pred + (dc << point_transform);
863 ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
866 pred= 1 << (bits - 1);
872 pred= ptr16[-linesize];
874 PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
878 if (s->interlaced && s->bottom_field)
879 ptr16 += linesize >> 1;
880 pred &= (-1)<<(16-s->bits);
881 *ptr16= pred + (dc << point_transform);
890 for (i = 0; i < nb_components; i++) {
893 int n, h, v, x, y, c, j, linesize, dc;
895 c = s->comp_index[i];
900 linesize = s->linesize[c];
902 if(bits>8) linesize /= 2;
904 for (j = 0; j < n; j++) {
907 dc = mjpeg_decode_dc(s, s->dc_index[i]);
911 ptr = s->picture.data[c] +
912 (linesize * (v * mb_y + y)) +
913 (h * mb_x + x); //FIXME optimize this crap
914 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
916 pred &= (-1)<<(8-s->bits);
917 *ptr = pred + (dc << point_transform);
919 ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
920 PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
922 pred &= (-1)<<(16-s->bits);
923 *ptr16= pred + (dc << point_transform);
933 if (s->restart_interval && !--s->restart_count) {
934 align_get_bits(&s->gb);
935 skip_bits(&s->gb, 16); /* skip RSTn */
942 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
943 int linesize, int lowres)
946 case 0: copy_block8(dst, src, linesize, linesize, 8);
948 case 1: copy_block4(dst, src, linesize, linesize, 4);
950 case 2: copy_block2(dst, src, linesize, linesize, 2);
957 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
958 int Al, const uint8_t *mb_bitmask,
959 const AVFrame *reference)
962 uint8_t *data[MAX_COMPONENTS];
963 const uint8_t *reference_data[MAX_COMPONENTS];
964 int linesize[MAX_COMPONENTS];
965 GetBitContext mb_bitmask_gb;
968 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
970 if (s->flipped && s->avctx->lowres) {
971 av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with lowres\n");
975 for (i = 0; i < nb_components; i++) {
976 int c = s->comp_index[i];
977 data[c] = s->picture_ptr->data[c];
978 reference_data[c] = reference ? reference->data[c] : NULL;
979 linesize[c] = s->linesize[c];
980 s->coefs_finished[c] |= 1;
981 if (s->flipped && !(s->avctx->flags & CODEC_FLAG_EMU_EDGE)) {
982 // picture should be flipped upside-down for this codec
983 int offset = (linesize[c] * (s->v_scount[i] *
984 (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
986 reference_data[c] += offset;
991 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
992 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
993 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
995 if (s->restart_interval && !s->restart_count)
996 s->restart_count = s->restart_interval;
998 if (get_bits_left(&s->gb) < 0) {
999 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
1000 -get_bits_left(&s->gb));
1001 return AVERROR_INVALIDDATA;
1003 for (i = 0; i < nb_components; i++) {
1005 int n, h, v, x, y, c, j;
1007 n = s->nb_blocks[i];
1008 c = s->comp_index[i];
1013 for (j = 0; j < n; j++) {
1014 block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
1015 (h * mb_x + x) * 8) >> s->avctx->lowres);
1017 if (s->interlaced && s->bottom_field)
1018 block_offset += linesize[c] >> 1;
1019 ptr = data[c] + block_offset;
1020 if (!s->progressive) {
1022 mjpeg_copy_block(ptr, reference_data[c] + block_offset,
1023 linesize[c], s->avctx->lowres);
1025 s->dsp.clear_block(s->block);
1026 if (decode_block(s, s->block, i,
1027 s->dc_index[i], s->ac_index[i],
1028 s->quant_matrixes[s->quant_index[c]]) < 0) {
1029 av_log(s->avctx, AV_LOG_ERROR,
1030 "error y=%d x=%d\n", mb_y, mb_x);
1031 return AVERROR_INVALIDDATA;
1033 s->dsp.idct_put(ptr, linesize[c], s->block);
1036 int block_idx = s->block_stride[c] * (v * mb_y + y) +
1038 DCTELEM *block = s->blocks[c][block_idx];
1040 block[0] += get_bits1(&s->gb) *
1041 s->quant_matrixes[s->quant_index[c]][0] << Al;
1042 else if (decode_dc_progressive(s, block, i, s->dc_index[i],
1043 s->quant_matrixes[s->quant_index[c]],
1045 av_log(s->avctx, AV_LOG_ERROR,
1046 "error y=%d x=%d\n", mb_y, mb_x);
1047 return AVERROR_INVALIDDATA;
1050 av_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x);
1051 av_dlog(s->avctx, "%d %d %d %d %d %d %d %d \n",
1052 mb_x, mb_y, x, y, c, s->bottom_field,
1053 (v * mb_y + y) * 8, (h * mb_x + x) * 8);
1061 if (s->restart_interval) {
1063 if(s->restart_count == 0 && s->avctx->codec_id == AV_CODEC_ID_THP){
1064 align_get_bits(&s->gb);
1065 for (i = 0; i < nb_components; i++) /* reset dc */
1066 s->last_dc[i] = 1024;
1069 i = 8 + ((-get_bits_count(&s->gb)) & 7);
1071 if (show_bits(&s->gb, i) == (1 << i) - 1) {
1072 int pos = get_bits_count(&s->gb);
1073 align_get_bits(&s->gb);
1074 while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
1075 skip_bits(&s->gb, 8);
1076 if (get_bits_left(&s->gb) >= 8 && (get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
1077 for (i = 0; i < nb_components; i++) /* reset dc */
1078 s->last_dc[i] = 1024;
1080 skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
1088 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
1089 int se, int Ah, int Al)
1093 int c = s->comp_index[0];
1094 uint8_t *data = s->picture.data[c];
1095 int linesize = s->linesize[c];
1097 int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
1100 s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
1101 last_scan = !~s->coefs_finished[c];
1104 if (s->interlaced && s->bottom_field)
1105 data += linesize >> 1;
1107 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1108 uint8_t *ptr = data + (mb_y * linesize * 8 >> s->avctx->lowres);
1109 int block_idx = mb_y * s->block_stride[c];
1110 DCTELEM (*block)[64] = &s->blocks[c][block_idx];
1111 uint8_t *last_nnz = &s->last_nnz[c][block_idx];
1112 for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
1115 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
1116 quant_matrix, ss, se, Al, &EOBRUN);
1118 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
1119 quant_matrix, ss, se, Al, &EOBRUN);
1121 av_log(s->avctx, AV_LOG_ERROR,
1122 "error y=%d x=%d\n", mb_y, mb_x);
1123 return AVERROR_INVALIDDATA;
1127 s->dsp.idct_put(ptr, linesize, *block);
1128 ptr += 8 >> s->avctx->lowres;
1135 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
1136 const AVFrame *reference)
1138 int len, nb_components, i, h, v, predictor, point_transform;
1140 const int block_size = s->lossless ? 1 : 8;
1141 int ilv, prev_shift;
1143 if (!s->got_picture) {
1144 av_log(s->avctx, AV_LOG_WARNING,
1145 "Can not process SOS before SOF, skipping\n");
1149 av_assert0(s->picture_ptr->data[0]);
1150 /* XXX: verify len field validity */
1151 len = get_bits(&s->gb, 16);
1152 nb_components = get_bits(&s->gb, 8);
1153 if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
1154 av_log(s->avctx, AV_LOG_ERROR,
1155 "decode_sos: nb_components (%d) unsupported\n", nb_components);
1156 return AVERROR_PATCHWELCOME;
1158 if (len != 6 + 2 * nb_components) {
1159 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1160 return AVERROR_INVALIDDATA;
1162 for (i = 0; i < nb_components; i++) {
1163 id = get_bits(&s->gb, 8) - 1;
1164 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1165 /* find component index */
1166 for (index = 0; index < s->nb_components; index++)
1167 if (id == s->component_id[index])
1169 if (index == s->nb_components) {
1170 av_log(s->avctx, AV_LOG_ERROR,
1171 "decode_sos: index(%d) out of components\n", index);
1172 return AVERROR_INVALIDDATA;
1174 /* Metasoft MJPEG codec has Cb and Cr swapped */
1175 if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1176 && nb_components == 3 && s->nb_components == 3 && i)
1179 if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == PIX_FMT_GBR24P)
1181 if(nb_components == 1 && s->nb_components == 3 && s->avctx->pix_fmt == PIX_FMT_GBR24P)
1182 index = (index+2)%3;
1184 s->comp_index[i] = index;
1186 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1187 s->h_scount[i] = s->h_count[index];
1188 s->v_scount[i] = s->v_count[index];
1190 s->dc_index[i] = get_bits(&s->gb, 4);
1191 s->ac_index[i] = get_bits(&s->gb, 4);
1193 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1194 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1196 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))
1200 predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1201 ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1202 if(s->avctx->codec_tag != AV_RL32("CJPG")){
1203 prev_shift = get_bits(&s->gb, 4); /* Ah */
1204 point_transform = get_bits(&s->gb, 4); /* Al */
1206 prev_shift = point_transform = 0;
1208 if (nb_components > 1) {
1209 /* interleaved stream */
1210 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1211 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1212 } else if (!s->ls) { /* skip this for JPEG-LS */
1213 h = s->h_max / s->h_scount[0];
1214 v = s->v_max / s->v_scount[0];
1215 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1216 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1217 s->nb_blocks[0] = 1;
1222 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1223 av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n",
1224 s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1225 predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
1226 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
1229 /* mjpeg-b can have padding bytes between sos and image data, skip them */
1230 for (i = s->mjpb_skiptosod; i > 0; i--)
1231 skip_bits(&s->gb, 8);
1234 for (i = 0; i < nb_components; i++)
1235 s->last_dc[i] = 1024;
1238 av_assert0(s->picture_ptr == &s->picture);
1239 if (CONFIG_JPEGLS_DECODER && s->ls) {
1241 // reset_ls_coding_parameters(s, 0);
1243 if ((ret = ff_jpegls_decode_picture(s, predictor,
1244 point_transform, ilv)) < 0)
1248 if ((ret = ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform)) < 0)
1251 if ((ret = ljpeg_decode_yuv_scan(s, predictor, point_transform)) < 0)
1256 if (s->progressive && predictor) {
1257 av_assert0(s->picture_ptr == &s->picture);
1258 if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor,
1260 point_transform)) < 0)
1263 if ((ret = mjpeg_decode_scan(s, nb_components,
1264 prev_shift, point_transform,
1265 mb_bitmask, reference)) < 0)
1270 if (s->interlaced &&
1271 get_bits_left(&s->gb) > 32 &&
1272 show_bits(&s->gb, 8) == 0xFF) {
1273 GetBitContext bak = s->gb;
1274 align_get_bits(&bak);
1275 if (show_bits(&bak, 16) == 0xFFD1) {
1276 av_log(s->avctx, AV_LOG_DEBUG, "AVRn interlaced picture marker found\n");
1278 skip_bits(&s->gb, 16);
1279 s->bottom_field ^= 1;
1288 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1289 return AVERROR_INVALIDDATA;
1292 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1294 if (get_bits(&s->gb, 16) != 4)
1295 return AVERROR_INVALIDDATA;
1296 s->restart_interval = get_bits(&s->gb, 16);
1297 s->restart_count = 0;
1298 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
1299 s->restart_interval);
1304 static int mjpeg_decode_app(MJpegDecodeContext *s)
1308 len = get_bits(&s->gb, 16);
1310 return AVERROR_INVALIDDATA;
1311 if (8 * len > get_bits_left(&s->gb))
1312 return AVERROR_INVALIDDATA;
1314 id = get_bits_long(&s->gb, 32);
1315 id = av_be2ne32(id);
1318 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1319 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1321 /* Buggy AVID, it puts EOI only at every 10th frame. */
1322 /* Also, this fourcc is used by non-avid files too, it holds some
1323 information, but it's always present in AVID-created files. */
1324 if (id == AV_RL32("AVI1")) {
1330 4bytes field_size_less_padding
1333 i = get_bits(&s->gb, 8); len--;
1334 av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
1336 skip_bits(&s->gb, 8);
1337 skip_bits(&s->gb, 32);
1338 skip_bits(&s->gb, 32);
1346 if (id == AV_RL32("JFIF")) {
1347 int t_w, t_h, v1, v2;
1348 skip_bits(&s->gb, 8); /* the trailing zero-byte */
1349 v1 = get_bits(&s->gb, 8);
1350 v2 = get_bits(&s->gb, 8);
1351 skip_bits(&s->gb, 8);
1353 s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
1354 s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
1356 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1357 av_log(s->avctx, AV_LOG_INFO,
1358 "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1360 s->avctx->sample_aspect_ratio.num,
1361 s->avctx->sample_aspect_ratio.den);
1363 t_w = get_bits(&s->gb, 8);
1364 t_h = get_bits(&s->gb, 8);
1366 /* skip thumbnail */
1367 if (len -10 - (t_w * t_h * 3) > 0)
1368 len -= t_w * t_h * 3;
1374 if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
1375 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1376 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1377 skip_bits(&s->gb, 16); /* version */
1378 skip_bits(&s->gb, 16); /* flags0 */
1379 skip_bits(&s->gb, 16); /* flags1 */
1380 skip_bits(&s->gb, 8); /* transform */
1385 if (id == AV_RL32("LJIF")) {
1386 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1387 av_log(s->avctx, AV_LOG_INFO,
1388 "Pegasus lossless jpeg header found\n");
1389 skip_bits(&s->gb, 16); /* version ? */
1390 skip_bits(&s->gb, 16); /* unknwon always 0? */
1391 skip_bits(&s->gb, 16); /* unknwon always 0? */
1392 skip_bits(&s->gb, 16); /* unknwon always 0? */
1393 switch (get_bits(&s->gb, 8)) {
1403 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1410 if ((s->start_code == APP1) && (len > (0x28 - 8))) {
1411 id = get_bits_long(&s->gb, 32);
1412 id = av_be2ne32(id);
1415 if (id == AV_RL32("mjpg")) {
1417 skip_bits(&s->gb, 32); /* field size */
1418 skip_bits(&s->gb, 32); /* pad field size */
1419 skip_bits(&s->gb, 32); /* next off */
1420 skip_bits(&s->gb, 32); /* quant off */
1421 skip_bits(&s->gb, 32); /* huff off */
1422 skip_bits(&s->gb, 32); /* image off */
1423 skip_bits(&s->gb, 32); /* scan off */
1424 skip_bits(&s->gb, 32); /* data off */
1426 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1427 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1432 /* slow but needed for extreme adobe jpegs */
1434 av_log(s->avctx, AV_LOG_ERROR,
1435 "mjpeg: error, decode_app parser read over the end\n");
1437 skip_bits(&s->gb, 8);
1442 static int mjpeg_decode_com(MJpegDecodeContext *s)
1444 int len = get_bits(&s->gb, 16);
1445 if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
1446 char *cbuf = av_malloc(len - 1);
1449 for (i = 0; i < len - 2; i++)
1450 cbuf[i] = get_bits(&s->gb, 8);
1451 if (i > 0 && cbuf[i - 1] == '\n')
1456 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1457 av_log(s->avctx, AV_LOG_INFO, "comment: '%s'\n", cbuf);
1459 /* buggy avid, it puts EOI only at every 10th frame */
1460 if (!strcmp(cbuf, "AVID")) {
1462 } else if (!strcmp(cbuf, "CS=ITU601"))
1464 else if ((len > 31 && !strncmp(cbuf, "Intel(R) JPEG Library, version 1", 32)) ||
1465 (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
1475 /* return the 8 bit start code value and update the search
1476 state. Return -1 if no start code found */
1477 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1479 const uint8_t *buf_ptr;
1484 buf_ptr = *pbuf_ptr;
1485 while (buf_ptr < buf_end) {
1488 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1496 av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1497 *pbuf_ptr = buf_ptr;
1501 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1502 const uint8_t **buf_ptr, const uint8_t *buf_end,
1503 const uint8_t **unescaped_buf_ptr,
1504 int *unescaped_buf_size)
1507 start_code = find_marker(buf_ptr, buf_end);
1509 av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
1511 return AVERROR(ENOMEM);
1513 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1514 if (start_code == SOS && !s->ls) {
1515 const uint8_t *src = *buf_ptr;
1516 uint8_t *dst = s->buffer;
1518 while (src < buf_end) {
1519 uint8_t x = *(src++);
1522 if (s->avctx->codec_id != AV_CODEC_ID_THP) {
1524 while (src < buf_end && x == 0xff)
1527 if (x >= 0xd0 && x <= 0xd7)
1534 *unescaped_buf_ptr = s->buffer;
1535 *unescaped_buf_size = dst - s->buffer;
1537 av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1538 (buf_end - *buf_ptr) - (dst - s->buffer));
1539 } else if (start_code == SOS && s->ls) {
1540 const uint8_t *src = *buf_ptr;
1541 uint8_t *dst = s->buffer;
1549 while (src + t < buf_end) {
1550 uint8_t x = src[t++];
1552 while ((src + t < buf_end) && x == 0xff)
1561 init_put_bits(&pb, dst, t);
1563 /* unescape bitstream */
1565 uint8_t x = src[b++];
1566 put_bits(&pb, 8, x);
1569 put_bits(&pb, 7, x);
1573 flush_put_bits(&pb);
1575 *unescaped_buf_ptr = dst;
1576 *unescaped_buf_size = (bit_count + 7) >> 3;
1578 *unescaped_buf_ptr = *buf_ptr;
1579 *unescaped_buf_size = buf_end - *buf_ptr;
1585 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
1588 const uint8_t *buf = avpkt->data;
1589 int buf_size = avpkt->size;
1590 MJpegDecodeContext *s = avctx->priv_data;
1591 const uint8_t *buf_end, *buf_ptr;
1592 const uint8_t *unescaped_buf_ptr;
1593 int unescaped_buf_size;
1597 AVFrame *picture = data;
1599 s->got_picture = 0; // picture from previous image can not be reused
1601 buf_end = buf + buf_size;
1602 while (buf_ptr < buf_end) {
1603 /* find start next marker */
1604 start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1606 &unescaped_buf_size);
1608 if (start_code < 0) {
1610 } else if (unescaped_buf_size > (1U<<29)) {
1611 av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
1612 start_code, unescaped_buf_size, buf_size);
1613 return AVERROR_INVALIDDATA;
1615 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
1616 start_code, buf_end - buf_ptr);
1618 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
1620 s->start_code = start_code;
1621 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1622 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1624 /* process markers */
1625 if (start_code >= 0xd0 && start_code <= 0xd7)
1626 av_log(avctx, AV_LOG_DEBUG,
1627 "restart marker: %d\n", start_code & 0x0f);
1629 else if (start_code >= APP0 && start_code <= APP15)
1630 mjpeg_decode_app(s);
1632 else if (start_code == COM)
1633 mjpeg_decode_com(s);
1635 switch (start_code) {
1637 s->restart_interval = 0;
1638 s->restart_count = 0;
1639 /* nothing to do on SOI */
1642 ff_mjpeg_decode_dqt(s);
1645 if ((ret = ff_mjpeg_decode_dht(s)) < 0) {
1646 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1655 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1662 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1669 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1676 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1680 if (!CONFIG_JPEGLS_DECODER ||
1681 (ret = ff_jpegls_decode_lse(s)) < 0)
1687 if (!s->got_picture) {
1688 av_log(avctx, AV_LOG_WARNING,
1689 "Found EOI before any SOF, ignoring\n");
1692 if (s->interlaced) {
1693 s->bottom_field ^= 1;
1694 /* if not bottom field, do not output image yet */
1695 if (s->bottom_field == !s->interlace_polarity)
1698 *picture = *s->picture_ptr;
1699 *data_size = sizeof(AVFrame);
1702 picture->quality = FFMAX3(s->qscale[0],
1705 picture->qstride = 0;
1706 picture->qscale_table = s->qscale_table;
1707 memset(picture->qscale_table, picture->quality,
1708 (s->width + 15) / 16);
1709 if (avctx->debug & FF_DEBUG_QP)
1710 av_log(avctx, AV_LOG_DEBUG,
1711 "QP: %d\n", picture->quality);
1712 picture->quality *= FF_QP2LAMBDA;
1717 if ((ret = ff_mjpeg_decode_sos(s, NULL, NULL)) < 0 &&
1718 (avctx->err_recognition & AV_EF_EXPLODE))
1722 mjpeg_decode_dri(s);
1734 av_log(avctx, AV_LOG_ERROR,
1735 "mjpeg: unsupported coding type (%x)\n", start_code);
1739 /* eof process start code */
1740 buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
1741 av_log(avctx, AV_LOG_DEBUG,
1742 "marker parser used %d bytes (%d bits)\n",
1743 (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
1746 if (s->got_picture) {
1747 av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1750 av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1751 return AVERROR_INVALIDDATA;
1754 uint8_t *line = s->picture_ptr->data[s->upscale_h];
1755 av_assert0(avctx->pix_fmt == PIX_FMT_YUVJ444P ||
1756 avctx->pix_fmt == PIX_FMT_YUV444P ||
1757 avctx->pix_fmt == PIX_FMT_YUVJ440P ||
1758 avctx->pix_fmt == PIX_FMT_YUV440P);
1759 for (i = 0; i < s->chroma_height; i++) {
1760 for (index = s->width - 1; index; index--)
1761 line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
1762 line += s->linesize[s->upscale_h];
1766 uint8_t *dst = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(s->height - 1) * s->linesize[s->upscale_v]];
1767 av_assert0(avctx->pix_fmt == PIX_FMT_YUVJ444P ||
1768 avctx->pix_fmt == PIX_FMT_YUV444P ||
1769 avctx->pix_fmt == PIX_FMT_YUVJ422P ||
1770 avctx->pix_fmt == PIX_FMT_YUV422P);
1771 for (i = s->height - 1; i; i--) {
1772 uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[i / 2 * s->linesize[s->upscale_v]];
1773 uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(i + 1) / 2 * s->linesize[s->upscale_v]];
1775 memcpy(dst, src1, s->width);
1777 for (index = 0; index < s->width; index++)
1778 dst[index] = (src1[index] + src2[index]) >> 1;
1780 dst -= s->linesize[s->upscale_v];
1783 if (s->flipped && (s->avctx->flags & CODEC_FLAG_EMU_EDGE)) {
1784 int hshift, vshift, j;
1785 avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
1786 for (index=0; index<4; index++) {
1787 uint8_t *dst = s->picture_ptr->data[index];
1790 if(index && index<3){
1791 w = -((-w) >> hshift);
1792 h = -((-h) >> vshift);
1795 uint8_t *dst2 = dst + s->linesize[index]*(h-1);
1796 for (i=0; i<h/2; i++) {
1798 FFSWAP(int, dst[j], dst2[j]);
1799 dst += s->linesize[index];
1800 dst2 -= s->linesize[index];
1806 av_log(avctx, AV_LOG_DEBUG, "decode frame unused %td bytes\n",
1808 // return buf_end - buf_ptr;
1809 return buf_ptr - buf;
1812 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1814 MJpegDecodeContext *s = avctx->priv_data;
1817 if (s->picture_ptr && s->picture_ptr->data[0])
1818 avctx->release_buffer(avctx, s->picture_ptr);
1821 av_free(s->qscale_table);
1822 av_freep(&s->ljpeg_buffer);
1823 s->ljpeg_buffer_size = 0;
1825 for (i = 0; i < 3; i++) {
1826 for (j = 0; j < 4; j++)
1827 ff_free_vlc(&s->vlcs[i][j]);
1829 for (i = 0; i < MAX_COMPONENTS; i++) {
1830 av_freep(&s->blocks[i]);
1831 av_freep(&s->last_nnz[i]);
1836 #if CONFIG_MJPEG_DECODER
1837 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1838 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1839 static const AVOption options[] = {
1840 { "extern_huff", "Use external huffman table.",
1841 OFFSET(extern_huff), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
1845 static const AVClass mjpegdec_class = {
1846 .class_name = "MJPEG decoder",
1847 .item_name = av_default_item_name,
1849 .version = LIBAVUTIL_VERSION_INT,
1852 AVCodec ff_mjpeg_decoder = {
1854 .type = AVMEDIA_TYPE_VIDEO,
1855 .id = AV_CODEC_ID_MJPEG,
1856 .priv_data_size = sizeof(MJpegDecodeContext),
1857 .init = ff_mjpeg_decode_init,
1858 .close = ff_mjpeg_decode_end,
1859 .decode = ff_mjpeg_decode_frame,
1860 .capabilities = CODEC_CAP_DR1,
1862 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1863 .priv_class = &mjpegdec_class,
1866 #if CONFIG_THP_DECODER
1867 AVCodec ff_thp_decoder = {
1869 .type = AVMEDIA_TYPE_VIDEO,
1870 .id = AV_CODEC_ID_THP,
1871 .priv_data_size = sizeof(MJpegDecodeContext),
1872 .init = ff_mjpeg_decode_init,
1873 .close = ff_mjpeg_decode_end,
1874 .decode = ff_mjpeg_decode_frame,
1875 .capabilities = CODEC_CAP_DR1,
1877 .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),