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], ff_mjpeg_bits_dc_luminance,
69 ff_mjpeg_val_dc, 12, 0, 0);
70 build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,
71 ff_mjpeg_val_dc, 12, 0, 0);
72 build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance,
73 ff_mjpeg_val_ac_luminance, 251, 0, 1);
74 build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance,
75 ff_mjpeg_val_ac_chrominance, 251, 0, 1);
76 build_vlc(&s->vlcs[2][0], ff_mjpeg_bits_ac_luminance,
77 ff_mjpeg_val_ac_luminance, 251, 0, 0);
78 build_vlc(&s->vlcs[2][1], ff_mjpeg_bits_ac_chrominance,
79 ff_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 == 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];
162 len = get_bits(&s->gb, 16) - 2;
167 class = get_bits(&s->gb, 4);
170 index = get_bits(&s->gb, 4);
174 for (i = 1; i <= 16; i++) {
175 bits_table[i] = get_bits(&s->gb, 8);
179 if (len < n || n > 256)
183 for (i = 0; i < n; i++) {
184 v = get_bits(&s->gb, 8);
191 /* build VLC and flush previous vlc if present */
192 ff_free_vlc(&s->vlcs[class][index]);
193 av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
194 class, index, code_max + 1);
195 if (build_vlc(&s->vlcs[class][index], bits_table, val_table,
196 code_max + 1, 0, class > 0) < 0)
200 ff_free_vlc(&s->vlcs[2][index]);
201 if (build_vlc(&s->vlcs[2][index], bits_table, val_table,
202 code_max + 1, 0, 0) < 0)
209 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
211 int len, nb_components, i, width, height, pix_fmt_id;
214 s->upscale_h = s->upscale_v = 0;
216 /* XXX: verify len field validity */
217 len = get_bits(&s->gb, 16);
218 s->bits = get_bits(&s->gb, 8);
222 if (s->bits == 9 && !s->pegasus_rct)
223 s->rct = 1; // FIXME ugly
225 if (s->bits != 8 && !s->lossless) {
226 av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
230 if(s->lossless && s->avctx->lowres){
231 av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
235 height = get_bits(&s->gb, 16);
236 width = get_bits(&s->gb, 16);
238 // HACK for odd_height.mov
239 if (s->interlaced && s->width == width && s->height == height + 1)
242 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
243 if (av_image_check_size(width, height, 0, s->avctx))
246 nb_components = get_bits(&s->gb, 8);
247 if (nb_components <= 0 ||
248 nb_components > MAX_COMPONENTS)
250 if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
251 if (nb_components != s->nb_components) {
252 av_log(s->avctx, AV_LOG_ERROR, "nb_components changing in interlaced picture\n");
253 return AVERROR_INVALIDDATA;
256 if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
257 av_log(s->avctx, AV_LOG_ERROR,
258 "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
261 s->nb_components = nb_components;
264 for (i = 0; i < nb_components; i++) {
266 s->component_id[i] = get_bits(&s->gb, 8) - 1;
267 s->h_count[i] = get_bits(&s->gb, 4);
268 s->v_count[i] = get_bits(&s->gb, 4);
269 /* compute hmax and vmax (only used in interleaved case) */
270 if (s->h_count[i] > s->h_max)
271 s->h_max = s->h_count[i];
272 if (s->v_count[i] > s->v_max)
273 s->v_max = s->v_count[i];
274 if (!s->h_count[i] || !s->v_count[i]) {
275 av_log(s->avctx, AV_LOG_ERROR, "h/v_count is 0\n");
278 s->quant_index[i] = get_bits(&s->gb, 8);
279 if (s->quant_index[i] >= 4)
281 av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
282 i, s->h_count[i], s->v_count[i],
283 s->component_id[i], s->quant_index[i]);
286 if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
287 av_log(s->avctx, AV_LOG_ERROR,
288 "Subsampling in JPEG-LS is not supported.\n");
292 if (s->v_max == 1 && s->h_max == 1 && s->lossless==1 && nb_components==3)
295 /* if different size, realloc/alloc picture */
296 /* XXX: also check h_count and v_count */
297 if (width != s->width || height != s->height) {
298 av_freep(&s->qscale_table);
304 /* test interlaced mode */
305 if (s->first_picture &&
306 s->org_height != 0 &&
307 s->height < ((s->org_height * 3) / 4)) {
309 s->bottom_field = s->interlace_polarity;
310 s->picture_ptr->interlaced_frame = 1;
311 s->picture_ptr->top_field_first = !s->interlace_polarity;
315 avcodec_set_dimensions(s->avctx, width, height);
317 s->qscale_table = av_mallocz((s->width + 15) / 16);
318 s->first_picture = 0;
321 if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
322 if (s->progressive) {
323 av_log_ask_for_sample(s->avctx, "progressively coded interlaced pictures not supported\n");
324 return AVERROR_INVALIDDATA;
327 /* XXX: not complete test ! */
328 pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
329 (s->h_count[1] << 20) | (s->v_count[1] << 16) |
330 (s->h_count[2] << 12) | (s->v_count[2] << 8) |
331 (s->h_count[3] << 4) | s->v_count[3];
332 av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
333 /* NOTE we do not allocate pictures large enough for the possible
334 * padding of h/v_count being 4 */
335 if (!(pix_fmt_id & 0xD0D0D0D0))
336 pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
337 if (!(pix_fmt_id & 0x0D0D0D0D))
338 pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
340 switch (pix_fmt_id) {
343 s->avctx->pix_fmt = PIX_FMT_BGR24;
345 if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
346 s->avctx->pix_fmt = PIX_FMT_GBR24P;
348 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
349 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
352 av_assert0(s->nb_components == 3);
356 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
357 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
359 s->upscale_h = (pix_fmt_id == 0x22122100);
360 s->chroma_height = s->height;
364 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
365 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
366 s->upscale_v = (pix_fmt_id == 0x22211200);
368 s->chroma_height = s->height;
371 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
372 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
375 s->chroma_height = s->height / 2;
379 s->avctx->pix_fmt = PIX_FMT_GRAY8;
381 s->avctx->pix_fmt = PIX_FMT_GRAY16;
386 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
387 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
388 s->upscale_h = (pix_fmt_id == 0x22211100) * 2 + (pix_fmt_id == 0x22112100);
389 s->chroma_height = s->height / 2;
392 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
393 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
397 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
398 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
399 s->upscale_v = (pix_fmt_id == 0x22121100) + 1;
402 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
403 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
406 av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
409 if ((s->upscale_h || s->upscale_v) && s->avctx->lowres) {
410 av_log(s->avctx, AV_LOG_ERROR, "lowres not supported for weird subsampling\n");
411 return AVERROR_PATCHWELCOME;
414 s->upscale_h = s->upscale_v = 0;
415 if (s->nb_components > 1)
416 s->avctx->pix_fmt = PIX_FMT_RGB24;
417 else if (s->bits <= 8)
418 s->avctx->pix_fmt = PIX_FMT_GRAY8;
420 s->avctx->pix_fmt = PIX_FMT_GRAY16;
423 if (s->picture_ptr->data[0])
424 s->avctx->release_buffer(s->avctx, s->picture_ptr);
426 if (s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0) {
427 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
430 s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
431 s->picture_ptr->key_frame = 1;
434 for (i = 0; i < 3; i++)
435 s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
437 // printf("%d %d %d %d %d %d\n",
438 // s->width, s->height, s->linesize[0], s->linesize[1],
439 // s->interlaced, s->avctx->height);
441 if (len != (8 + (3 * nb_components)))
442 av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
445 /* totally blank picture as progressive JPEG will only add details to it */
446 if (s->progressive) {
447 int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
448 int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
449 for (i = 0; i < s->nb_components; i++) {
450 int size = bw * bh * s->h_count[i] * s->v_count[i];
451 av_freep(&s->blocks[i]);
452 av_freep(&s->last_nnz[i]);
453 s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
454 s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
455 s->block_stride[i] = bw * s->h_count[i];
457 memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
462 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
465 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
467 av_log(s->avctx, AV_LOG_WARNING,
468 "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
469 0, dc_index, &s->vlcs[0][dc_index]);
474 return get_xbits(&s->gb, code);
479 /* decode block and dequantize */
480 static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,
481 int dc_index, int ac_index, int16_t *quant_matrix)
483 int code, i, j, level, val;
486 val = mjpeg_decode_dc(s, dc_index);
488 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
491 val = val * quant_matrix[0] + s->last_dc[component];
492 s->last_dc[component] = val;
496 {OPEN_READER(re, &s->gb);
498 UPDATE_CACHE(re, &s->gb);
499 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
501 i += ((unsigned)code) >> 4;
504 if (code > MIN_CACHE_BITS - 16)
505 UPDATE_CACHE(re, &s->gb);
508 int cache = GET_CACHE(re, &s->gb);
509 int sign = (~cache) >> 31;
510 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
513 LAST_SKIP_BITS(re, &s->gb, code);
516 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
519 j = s->scantable.permutated[i];
520 block[j] = level * quant_matrix[j];
523 CLOSE_READER(re, &s->gb);}
528 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block,
529 int component, int dc_index,
530 int16_t *quant_matrix, int Al)
533 s->dsp.clear_block(block);
534 val = mjpeg_decode_dc(s, dc_index);
536 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
539 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
540 s->last_dc[component] = val;
545 /* decode block and dequantize - progressive JPEG version */
546 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
547 uint8_t *last_nnz, int ac_index,
548 int16_t *quant_matrix,
549 int ss, int se, int Al, int *EOBRUN)
551 int code, i, j, level, val, run;
559 OPEN_READER(re, &s->gb);
560 for (i = ss; ; i++) {
561 UPDATE_CACHE(re, &s->gb);
562 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
564 run = ((unsigned) code) >> 4;
568 if (code > MIN_CACHE_BITS - 16)
569 UPDATE_CACHE(re, &s->gb);
572 int cache = GET_CACHE(re, &s->gb);
573 int sign = (~cache) >> 31;
574 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
577 LAST_SKIP_BITS(re, &s->gb, code);
581 j = s->scantable.permutated[se];
582 block[j] = level * quant_matrix[j] << Al;
585 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
588 j = s->scantable.permutated[i];
589 block[j] = level * quant_matrix[j] << Al;
591 if (run == 0xF) {// ZRL - skip 15 coefficients
594 av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
600 UPDATE_CACHE(re, &s->gb);
601 val += NEG_USR32(GET_CACHE(re, &s->gb), run);
602 LAST_SKIP_BITS(re, &s->gb, run);
609 CLOSE_READER(re, &s->gb);
618 #define REFINE_BIT(j) { \
619 UPDATE_CACHE(re, &s->gb); \
620 sign = block[j] >> 15; \
621 block[j] += SHOW_UBITS(re, &s->gb, 1) * \
622 ((quant_matrix[j] ^ sign) - sign) << Al; \
623 LAST_SKIP_BITS(re, &s->gb, 1); \
631 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
636 j = s->scantable.permutated[i]; \
639 else if (run-- == 0) \
643 /* decode block and dequantize - progressive JPEG refinement pass */
644 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block,
646 int ac_index, int16_t *quant_matrix,
647 int ss, int se, int Al, int *EOBRUN)
649 int code, i = ss, j, sign, val, run;
650 int last = FFMIN(se, *last_nnz);
652 OPEN_READER(re, &s->gb);
657 UPDATE_CACHE(re, &s->gb);
658 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
661 run = ((unsigned) code) >> 4;
662 UPDATE_CACHE(re, &s->gb);
663 val = SHOW_UBITS(re, &s->gb, 1);
664 LAST_SKIP_BITS(re, &s->gb, 1);
666 j = s->scantable.permutated[i];
668 block[j] = ((quant_matrix[j]^val) - val) << Al;
672 CLOSE_READER(re, &s->gb);
676 run = ((unsigned) code) >> 4;
683 UPDATE_CACHE(re, &s->gb);
684 run += SHOW_UBITS(re, &s->gb, val);
685 LAST_SKIP_BITS(re, &s->gb, val);
697 for (; i <= last; i++) {
698 j = s->scantable.permutated[i];
702 CLOSE_READER(re, &s->gb);
709 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int predictor, int point_transform)
712 uint16_t (*buffer)[4];
713 int left[3], top[3], topleft[3];
714 const int linesize = s->linesize[0];
715 const int mask = (1 << s->bits) - 1;
719 s->restart_count = s->restart_interval;
721 av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
722 (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
723 buffer = s->ljpeg_buffer;
725 for (i = 0; i < 3; i++)
726 buffer[0][i] = 1 << (s->bits - 1);
728 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
729 uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
731 if (s->interlaced && s->bottom_field)
732 ptr += linesize >> 1;
734 for (i = 0; i < 3; i++)
735 top[i] = left[i] = topleft[i] = buffer[0][i];
737 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
738 int modified_predictor = predictor;
740 if (s->restart_interval && !s->restart_count){
741 s->restart_count = s->restart_interval;
745 top[i] = left[i]= topleft[i]= 1 << (s->bits - 1);
747 if (mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || !mb_x)
748 modified_predictor = 1;
750 for (i=0;i<nb_components;i++) {
754 top[i] = buffer[mb_x][i];
756 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
758 dc = mjpeg_decode_dc(s, s->dc_index[i]);
762 left[i] = buffer[mb_x][i] =
763 mask & (pred + (dc << point_transform));
766 if (s->restart_interval && !--s->restart_count) {
767 align_get_bits(&s->gb);
768 skip_bits(&s->gb, 16); /* skip RSTn */
773 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
774 ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
775 ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
776 ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
778 } else if (s->pegasus_rct) {
779 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
780 ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
781 ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
782 ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
785 for(i=0; i<nb_components; i++) {
786 int c= s->comp_index[i];
787 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
788 ptr[3*mb_x+2-c] = buffer[mb_x][i];
796 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
800 const int nb_components=s->nb_components;
801 int bits= (s->bits+7)&~7;
805 point_transform += bits - s->bits;
807 av_assert0(nb_components==1 || nb_components==3);
809 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
810 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
811 if (s->restart_interval && !s->restart_count){
812 s->restart_count = s->restart_interval;
817 if(!mb_x || mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || s->interlaced){
818 int toprow = mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x;
819 int leftcol = !mb_x || mb_y == resync_mb_y && mb_x == resync_mb_x;
820 for (i = 0; i < nb_components; i++) {
823 int n, h, v, x, y, c, j, linesize;
825 c = s->comp_index[i];
830 linesize= s->linesize[c];
832 if(bits>8) linesize /= 2;
837 dc = mjpeg_decode_dc(s, s->dc_index[i]);
841 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
844 pred= 1 << (bits - 1);
850 pred= ptr[-linesize];
852 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
856 if (s->interlaced && s->bottom_field)
857 ptr += linesize >> 1;
858 pred &= (-1)<<(8-s->bits);
859 *ptr= pred + (dc << point_transform);
861 ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
864 pred= 1 << (bits - 1);
870 pred= ptr16[-linesize];
872 PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
876 if (s->interlaced && s->bottom_field)
877 ptr16 += linesize >> 1;
878 pred &= (-1)<<(16-s->bits);
879 *ptr16= pred + (dc << point_transform);
888 for (i = 0; i < nb_components; i++) {
891 int n, h, v, x, y, c, j, linesize, dc;
893 c = s->comp_index[i];
898 linesize = s->linesize[c];
900 if(bits>8) linesize /= 2;
902 for (j = 0; j < n; j++) {
905 dc = mjpeg_decode_dc(s, s->dc_index[i]);
909 ptr = s->picture.data[c] +
910 (linesize * (v * mb_y + y)) +
911 (h * mb_x + x); //FIXME optimize this crap
912 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
914 pred &= (-1)<<(8-s->bits);
915 *ptr = pred + (dc << point_transform);
917 ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
918 PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
920 pred &= (-1)<<(16-s->bits);
921 *ptr16= pred + (dc << point_transform);
931 if (s->restart_interval && !--s->restart_count) {
932 align_get_bits(&s->gb);
933 skip_bits(&s->gb, 16); /* skip RSTn */
940 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
941 int linesize, int lowres)
944 case 0: copy_block8(dst, src, linesize, linesize, 8);
946 case 1: copy_block4(dst, src, linesize, linesize, 4);
948 case 2: copy_block2(dst, src, linesize, linesize, 2);
955 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
956 int Al, const uint8_t *mb_bitmask,
957 const AVFrame *reference)
960 uint8_t *data[MAX_COMPONENTS];
961 const uint8_t *reference_data[MAX_COMPONENTS];
962 int linesize[MAX_COMPONENTS];
963 GetBitContext mb_bitmask_gb;
966 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
968 if (s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
969 av_log(s->avctx, AV_LOG_ERROR,
970 "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
973 if (s->flipped && s->avctx->lowres) {
974 av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with lowres\n");
978 for (i = 0; i < nb_components; i++) {
979 int c = s->comp_index[i];
980 data[c] = s->picture_ptr->data[c];
981 reference_data[c] = reference ? reference->data[c] : NULL;
982 linesize[c] = s->linesize[c];
983 s->coefs_finished[c] |= 1;
985 // picture should be flipped upside-down for this codec
986 int offset = (linesize[c] * (s->v_scount[i] *
987 (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
989 reference_data[c] += offset;
994 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
995 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
996 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
998 if (s->restart_interval && !s->restart_count)
999 s->restart_count = s->restart_interval;
1001 if (get_bits_left(&s->gb) < 0) {
1002 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
1003 -get_bits_left(&s->gb));
1006 for (i = 0; i < nb_components; i++) {
1008 int n, h, v, x, y, c, j;
1010 n = s->nb_blocks[i];
1011 c = s->comp_index[i];
1016 for (j = 0; j < n; j++) {
1017 block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
1018 (h * mb_x + x) * 8) >> s->avctx->lowres);
1020 if (s->interlaced && s->bottom_field)
1021 block_offset += linesize[c] >> 1;
1022 ptr = data[c] + block_offset;
1023 if (!s->progressive) {
1025 mjpeg_copy_block(ptr, reference_data[c] + block_offset,
1026 linesize[c], s->avctx->lowres);
1028 s->dsp.clear_block(s->block);
1029 if (decode_block(s, s->block, i,
1030 s->dc_index[i], s->ac_index[i],
1031 s->quant_matrixes[s->quant_index[c]]) < 0) {
1032 av_log(s->avctx, AV_LOG_ERROR,
1033 "error y=%d x=%d\n", mb_y, mb_x);
1036 s->dsp.idct_put(ptr, linesize[c], s->block);
1039 int block_idx = s->block_stride[c] * (v * mb_y + y) +
1041 DCTELEM *block = s->blocks[c][block_idx];
1043 block[0] += get_bits1(&s->gb) *
1044 s->quant_matrixes[s->quant_index[c]][0] << Al;
1045 else if (decode_dc_progressive(s, block, i, s->dc_index[i],
1046 s->quant_matrixes[s->quant_index[c]],
1048 av_log(s->avctx, AV_LOG_ERROR,
1049 "error y=%d x=%d\n", mb_y, mb_x);
1053 // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n",
1055 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n",
1056 // mb_x, mb_y, x, y, c, s->bottom_field,
1057 // (v * mb_y + y) * 8, (h * mb_x + x) * 8);
1065 if (s->restart_interval) {
1067 if(s->restart_count == 0 && s->avctx->codec_id == CODEC_ID_THP){
1068 align_get_bits(&s->gb);
1069 for (i = 0; i < nb_components; i++) /* reset dc */
1070 s->last_dc[i] = 1024;
1073 i = 8 + ((-get_bits_count(&s->gb)) & 7);
1075 if (show_bits(&s->gb, i) == (1 << i) - 1) {
1076 int pos = get_bits_count(&s->gb);
1077 align_get_bits(&s->gb);
1078 while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
1079 skip_bits(&s->gb, 8);
1080 if (get_bits_left(&s->gb) >= 8 && (get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
1081 for (i = 0; i < nb_components; i++) /* reset dc */
1082 s->last_dc[i] = 1024;
1084 skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
1092 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
1093 int se, int Ah, int Al)
1097 int c = s->comp_index[0];
1098 uint8_t *data = s->picture.data[c];
1099 int linesize = s->linesize[c];
1101 int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
1104 s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
1105 last_scan = !~s->coefs_finished[c];
1108 if (s->interlaced && s->bottom_field)
1109 data += linesize >> 1;
1111 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1112 uint8_t *ptr = data + (mb_y * linesize * 8 >> s->avctx->lowres);
1113 int block_idx = mb_y * s->block_stride[c];
1114 DCTELEM (*block)[64] = &s->blocks[c][block_idx];
1115 uint8_t *last_nnz = &s->last_nnz[c][block_idx];
1116 for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
1119 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
1120 quant_matrix, ss, se, Al, &EOBRUN);
1122 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
1123 quant_matrix, ss, se, Al, &EOBRUN);
1125 av_log(s->avctx, AV_LOG_ERROR,
1126 "error y=%d x=%d\n", mb_y, mb_x);
1131 s->dsp.idct_put(ptr, linesize, *block);
1132 ptr += 8 >> s->avctx->lowres;
1139 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
1140 const AVFrame *reference)
1142 int len, nb_components, i, h, v, predictor, point_transform;
1144 const int block_size = s->lossless ? 1 : 8;
1145 int ilv, prev_shift;
1147 if (!s->got_picture) {
1148 av_log(s->avctx, AV_LOG_WARNING,
1149 "Can not process SOS before SOF, skipping\n");
1153 av_assert0(s->picture_ptr->data[0]);
1154 /* XXX: verify len field validity */
1155 len = get_bits(&s->gb, 16);
1156 nb_components = get_bits(&s->gb, 8);
1157 if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
1158 av_log(s->avctx, AV_LOG_ERROR,
1159 "decode_sos: nb_components (%d) unsupported\n", nb_components);
1162 if (len != 6 + 2 * nb_components) {
1163 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1166 for (i = 0; i < nb_components; i++) {
1167 id = get_bits(&s->gb, 8) - 1;
1168 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1169 /* find component index */
1170 for (index = 0; index < s->nb_components; index++)
1171 if (id == s->component_id[index])
1173 if (index == s->nb_components) {
1174 av_log(s->avctx, AV_LOG_ERROR,
1175 "decode_sos: index(%d) out of components\n", index);
1178 /* Metasoft MJPEG codec has Cb and Cr swapped */
1179 if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1180 && nb_components == 3 && s->nb_components == 3 && i)
1183 if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == PIX_FMT_GBR24P)
1185 if(nb_components == 1 && s->nb_components == 3 && s->avctx->pix_fmt == PIX_FMT_GBR24P)
1186 index = (index+2)%3;
1188 s->comp_index[i] = index;
1190 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1191 s->h_scount[i] = s->h_count[index];
1192 s->v_scount[i] = s->v_count[index];
1194 s->dc_index[i] = get_bits(&s->gb, 4);
1195 s->ac_index[i] = get_bits(&s->gb, 4);
1197 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1198 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1200 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))
1204 predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1205 ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1206 if(s->avctx->codec_tag != AV_RL32("CJPG")){
1207 prev_shift = get_bits(&s->gb, 4); /* Ah */
1208 point_transform = get_bits(&s->gb, 4); /* Al */
1210 prev_shift = point_transform = 0;
1212 for (i = 0; i < nb_components; i++)
1213 s->last_dc[i] = 1024;
1215 if (nb_components > 1) {
1216 /* interleaved stream */
1217 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1218 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1219 } else if (!s->ls) { /* skip this for JPEG-LS */
1220 h = s->h_max / s->h_scount[0];
1221 v = s->v_max / s->v_scount[0];
1222 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1223 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1224 s->nb_blocks[0] = 1;
1229 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1230 av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n",
1231 s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1232 predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
1233 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
1236 /* mjpeg-b can have padding bytes between sos and image data, skip them */
1237 for (i = s->mjpb_skiptosod; i > 0; i--)
1238 skip_bits(&s->gb, 8);
1241 av_assert0(s->picture_ptr == &s->picture);
1242 if (CONFIG_JPEGLS_DECODER && s->ls) {
1244 // reset_ls_coding_parameters(s, 0);
1246 if (ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
1250 if (ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform) < 0)
1253 if (ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
1258 if (s->progressive && predictor) {
1259 av_assert0(s->picture_ptr == &s->picture);
1260 if (mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift,
1261 point_transform) < 0)
1264 if (mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
1265 mb_bitmask, reference) < 0)
1272 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1276 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1278 if (get_bits(&s->gb, 16) != 4)
1280 s->restart_interval = get_bits(&s->gb, 16);
1281 s->restart_count = 0;
1282 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
1283 s->restart_interval);
1288 static int mjpeg_decode_app(MJpegDecodeContext *s)
1292 len = get_bits(&s->gb, 16);
1295 if (8 * len > get_bits_left(&s->gb))
1298 id = get_bits_long(&s->gb, 32);
1299 id = av_be2ne32(id);
1302 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1303 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1305 /* Buggy AVID, it puts EOI only at every 10th frame. */
1306 /* Also, this fourcc is used by non-avid files too, it holds some
1307 information, but it's always present in AVID-created files. */
1308 if (id == AV_RL32("AVI1")) {
1314 4bytes field_size_less_padding
1317 // if (s->first_picture)
1318 // printf("mjpeg: workarounding buggy AVID\n");
1319 i = get_bits(&s->gb, 8); len--;
1320 av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
1322 skip_bits(&s->gb, 8);
1323 skip_bits(&s->gb, 32);
1324 skip_bits(&s->gb, 32);
1327 // if (s->interlace_polarity)
1328 // printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
1334 if (id == AV_RL32("JFIF")) {
1335 int t_w, t_h, v1, v2;
1336 skip_bits(&s->gb, 8); /* the trailing zero-byte */
1337 v1 = get_bits(&s->gb, 8);
1338 v2 = get_bits(&s->gb, 8);
1339 skip_bits(&s->gb, 8);
1341 s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
1342 s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
1344 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1345 av_log(s->avctx, AV_LOG_INFO,
1346 "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1348 s->avctx->sample_aspect_ratio.num,
1349 s->avctx->sample_aspect_ratio.den);
1351 t_w = get_bits(&s->gb, 8);
1352 t_h = get_bits(&s->gb, 8);
1354 /* skip thumbnail */
1355 if (len -10 - (t_w * t_h * 3) > 0)
1356 len -= t_w * t_h * 3;
1362 if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
1363 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1364 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1365 skip_bits(&s->gb, 16); /* version */
1366 skip_bits(&s->gb, 16); /* flags0 */
1367 skip_bits(&s->gb, 16); /* flags1 */
1368 skip_bits(&s->gb, 8); /* transform */
1373 if (id == AV_RL32("LJIF")) {
1374 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1375 av_log(s->avctx, AV_LOG_INFO,
1376 "Pegasus lossless jpeg header found\n");
1377 skip_bits(&s->gb, 16); /* version ? */
1378 skip_bits(&s->gb, 16); /* unknwon always 0? */
1379 skip_bits(&s->gb, 16); /* unknwon always 0? */
1380 skip_bits(&s->gb, 16); /* unknwon always 0? */
1381 switch (get_bits(&s->gb, 8)) {
1391 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1398 if ((s->start_code == APP1) && (len > (0x28 - 8))) {
1399 id = get_bits_long(&s->gb, 32);
1400 id = av_be2ne32(id);
1403 if (id == AV_RL32("mjpg")) {
1405 skip_bits(&s->gb, 32); /* field size */
1406 skip_bits(&s->gb, 32); /* pad field size */
1407 skip_bits(&s->gb, 32); /* next off */
1408 skip_bits(&s->gb, 32); /* quant off */
1409 skip_bits(&s->gb, 32); /* huff off */
1410 skip_bits(&s->gb, 32); /* image off */
1411 skip_bits(&s->gb, 32); /* scan off */
1412 skip_bits(&s->gb, 32); /* data off */
1414 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1415 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1420 /* slow but needed for extreme adobe jpegs */
1422 av_log(s->avctx, AV_LOG_ERROR,
1423 "mjpeg: error, decode_app parser read over the end\n");
1425 skip_bits(&s->gb, 8);
1430 static int mjpeg_decode_com(MJpegDecodeContext *s)
1432 int len = get_bits(&s->gb, 16);
1433 if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
1434 char *cbuf = av_malloc(len - 1);
1437 for (i = 0; i < len - 2; i++)
1438 cbuf[i] = get_bits(&s->gb, 8);
1439 if (i > 0 && cbuf[i - 1] == '\n')
1444 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1445 av_log(s->avctx, AV_LOG_INFO, "comment: '%s'\n", cbuf);
1447 /* buggy avid, it puts EOI only at every 10th frame */
1448 if (!strcmp(cbuf, "AVID")) {
1450 // if (s->first_picture)
1451 // printf("mjpeg: workarounding buggy AVID\n");
1452 } else if (!strcmp(cbuf, "CS=ITU601"))
1454 else if ((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
1455 (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
1465 /* return the 8 bit start code value and update the search
1466 state. Return -1 if no start code found */
1467 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1469 const uint8_t *buf_ptr;
1474 buf_ptr = *pbuf_ptr;
1475 while (buf_ptr < buf_end) {
1478 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1486 av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1487 *pbuf_ptr = buf_ptr;
1491 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1492 const uint8_t **buf_ptr, const uint8_t *buf_end,
1493 const uint8_t **unescaped_buf_ptr,
1494 int *unescaped_buf_size)
1497 start_code = find_marker(buf_ptr, buf_end);
1499 av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
1501 return AVERROR(ENOMEM);
1503 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1504 if (start_code == SOS && !s->ls) {
1505 const uint8_t *src = *buf_ptr;
1506 uint8_t *dst = s->buffer;
1508 while (src < buf_end) {
1509 uint8_t x = *(src++);
1512 if (s->avctx->codec_id != CODEC_ID_THP) {
1514 while (src < buf_end && x == 0xff)
1517 if (x >= 0xd0 && x <= 0xd7)
1524 *unescaped_buf_ptr = s->buffer;
1525 *unescaped_buf_size = dst - s->buffer;
1527 av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1528 (buf_end - *buf_ptr) - (dst - s->buffer));
1529 } else if (start_code == SOS && s->ls) {
1530 const uint8_t *src = *buf_ptr;
1531 uint8_t *dst = s->buffer;
1539 while (src + t < buf_end) {
1540 uint8_t x = src[t++];
1542 while ((src + t < buf_end) && x == 0xff)
1551 init_put_bits(&pb, dst, t);
1553 /* unescape bitstream */
1555 uint8_t x = src[b++];
1556 put_bits(&pb, 8, x);
1559 put_bits(&pb, 7, x);
1563 flush_put_bits(&pb);
1565 *unescaped_buf_ptr = dst;
1566 *unescaped_buf_size = (bit_count + 7) >> 3;
1568 *unescaped_buf_ptr = *buf_ptr;
1569 *unescaped_buf_size = buf_end - *buf_ptr;
1575 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
1578 const uint8_t *buf = avpkt->data;
1579 int buf_size = avpkt->size;
1580 MJpegDecodeContext *s = avctx->priv_data;
1581 const uint8_t *buf_end, *buf_ptr;
1582 const uint8_t *unescaped_buf_ptr;
1583 int unescaped_buf_size;
1586 AVFrame *picture = data;
1588 s->got_picture = 0; // picture from previous image can not be reused
1590 buf_end = buf + buf_size;
1591 while (buf_ptr < buf_end) {
1592 /* find start next marker */
1593 start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1595 &unescaped_buf_size);
1597 if (start_code < 0) {
1599 } else if (unescaped_buf_size > (1U<<29)) {
1600 av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
1601 start_code, unescaped_buf_size, buf_size);
1602 return AVERROR_INVALIDDATA;
1604 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
1605 start_code, buf_end - buf_ptr);
1607 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
1609 s->start_code = start_code;
1610 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1611 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1613 /* process markers */
1614 if (start_code >= 0xd0 && start_code <= 0xd7)
1615 av_log(avctx, AV_LOG_DEBUG,
1616 "restart marker: %d\n", start_code & 0x0f);
1618 else if (start_code >= APP0 && start_code <= APP15)
1619 mjpeg_decode_app(s);
1621 else if (start_code == COM)
1622 mjpeg_decode_com(s);
1624 switch (start_code) {
1626 s->restart_interval = 0;
1627 s->restart_count = 0;
1628 /* nothing to do on SOI */
1631 ff_mjpeg_decode_dqt(s);
1634 if (ff_mjpeg_decode_dht(s) < 0) {
1635 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1644 if (ff_mjpeg_decode_sof(s) < 0)
1651 if (ff_mjpeg_decode_sof(s) < 0)
1658 if (ff_mjpeg_decode_sof(s) < 0)
1665 if (ff_mjpeg_decode_sof(s) < 0)
1669 if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
1675 if (!s->got_picture) {
1676 av_log(avctx, AV_LOG_WARNING,
1677 "Found EOI before any SOF, ignoring\n");
1680 if (s->interlaced) {
1681 s->bottom_field ^= 1;
1682 /* if not bottom field, do not output image yet */
1683 if (s->bottom_field == !s->interlace_polarity)
1686 *picture = *s->picture_ptr;
1687 *data_size = sizeof(AVFrame);
1690 picture->quality = FFMAX3(s->qscale[0],
1693 picture->qstride = 0;
1694 picture->qscale_table = s->qscale_table;
1695 memset(picture->qscale_table, picture->quality,
1696 (s->width + 15) / 16);
1697 if (avctx->debug & FF_DEBUG_QP)
1698 av_log(avctx, AV_LOG_DEBUG,
1699 "QP: %d\n", picture->quality);
1700 picture->quality *= FF_QP2LAMBDA;
1705 if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
1706 (avctx->err_recognition & AV_EF_EXPLODE))
1707 return AVERROR_INVALIDDATA;
1710 mjpeg_decode_dri(s);
1722 av_log(avctx, AV_LOG_ERROR,
1723 "mjpeg: unsupported coding type (%x)\n", start_code);
1726 // printf("mjpeg: unsupported marker (%x)\n", start_code);
1730 /* eof process start code */
1731 buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
1732 av_log(avctx, AV_LOG_DEBUG,
1733 "marker parser used %d bytes (%d bits)\n",
1734 (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
1737 if (s->got_picture) {
1738 av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1741 av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1745 uint8_t *line = s->picture_ptr->data[s->upscale_h];
1746 av_assert0(avctx->pix_fmt == PIX_FMT_YUVJ444P ||
1747 avctx->pix_fmt == PIX_FMT_YUV444P ||
1748 avctx->pix_fmt == PIX_FMT_YUVJ440P ||
1749 avctx->pix_fmt == PIX_FMT_YUV440P);
1750 for (i = 0; i < s->chroma_height; i++) {
1751 for (index = s->width - 1; index; index--)
1752 line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
1753 line += s->linesize[s->upscale_h];
1757 uint8_t *dst = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(s->height - 1) * s->linesize[s->upscale_v]];
1758 av_assert0(avctx->pix_fmt == PIX_FMT_YUVJ444P ||
1759 avctx->pix_fmt == PIX_FMT_YUV444P ||
1760 avctx->pix_fmt == PIX_FMT_YUVJ422P ||
1761 avctx->pix_fmt == PIX_FMT_YUV422P);
1762 for (i = s->height - 1; i; i--) {
1763 uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[i / 2 * s->linesize[s->upscale_v]];
1764 uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(i + 1) / 2 * s->linesize[s->upscale_v]];
1766 memcpy(dst, src1, s->width);
1768 for (index = 0; index < s->width; index++)
1769 dst[index] = (src1[index] + src2[index]) >> 1;
1771 dst -= s->linesize[s->upscale_v];
1774 av_log(avctx, AV_LOG_DEBUG, "decode frame unused %td bytes\n",
1776 // return buf_end - buf_ptr;
1777 return buf_ptr - buf;
1780 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1782 MJpegDecodeContext *s = avctx->priv_data;
1785 if (s->picture_ptr && s->picture_ptr->data[0])
1786 avctx->release_buffer(avctx, s->picture_ptr);
1789 av_free(s->qscale_table);
1790 av_freep(&s->ljpeg_buffer);
1791 s->ljpeg_buffer_size = 0;
1793 for (i = 0; i < 3; i++) {
1794 for (j = 0; j < 4; j++)
1795 ff_free_vlc(&s->vlcs[i][j]);
1797 for (i = 0; i < MAX_COMPONENTS; i++) {
1798 av_freep(&s->blocks[i]);
1799 av_freep(&s->last_nnz[i]);
1804 #if CONFIG_MJPEG_DECODER
1805 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1806 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1807 static const AVOption options[] = {
1808 { "extern_huff", "Use external huffman table.",
1809 OFFSET(extern_huff), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD },
1813 static const AVClass mjpegdec_class = {
1814 .class_name = "MJPEG decoder",
1815 .item_name = av_default_item_name,
1817 .version = LIBAVUTIL_VERSION_INT,
1820 AVCodec ff_mjpeg_decoder = {
1822 .type = AVMEDIA_TYPE_VIDEO,
1823 .id = CODEC_ID_MJPEG,
1824 .priv_data_size = sizeof(MJpegDecodeContext),
1825 .init = ff_mjpeg_decode_init,
1826 .close = ff_mjpeg_decode_end,
1827 .decode = ff_mjpeg_decode_frame,
1828 .capabilities = CODEC_CAP_DR1,
1830 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1831 .priv_class = &mjpegdec_class,
1834 #if CONFIG_THP_DECODER
1835 AVCodec ff_thp_decoder = {
1837 .type = AVMEDIA_TYPE_VIDEO,
1839 .priv_data_size = sizeof(MJpegDecodeContext),
1840 .init = ff_mjpeg_decode_init,
1841 .close = ff_mjpeg_decode_end,
1842 .decode = ff_mjpeg_decode_frame,
1843 .capabilities = CODEC_CAP_DR1,
1845 .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),