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] = { 0 };
51 uint16_t huff_code[256];
52 uint16_t huff_sym[256];
55 assert(nb_codes <= 256);
57 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
59 for (i = 0; i < 256; i++)
60 huff_sym[i] = i + 16 * is_ac;
63 huff_sym[0] = 16 * 256;
65 return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
66 huff_code, 2, 2, huff_sym, 2, 2, use_static);
69 static void build_basic_mjpeg_vlc(MJpegDecodeContext *s)
71 build_vlc(&s->vlcs[0][0], ff_mjpeg_bits_dc_luminance,
72 ff_mjpeg_val_dc, 12, 0, 0);
73 build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,
74 ff_mjpeg_val_dc, 12, 0, 0);
75 build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance,
76 ff_mjpeg_val_ac_luminance, 251, 0, 1);
77 build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance,
78 ff_mjpeg_val_ac_chrominance, 251, 0, 1);
79 build_vlc(&s->vlcs[2][0], ff_mjpeg_bits_ac_luminance,
80 ff_mjpeg_val_ac_luminance, 251, 0, 0);
81 build_vlc(&s->vlcs[2][1], ff_mjpeg_bits_ac_chrominance,
82 ff_mjpeg_val_ac_chrominance, 251, 0, 0);
85 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
87 MJpegDecodeContext *s = avctx->priv_data;
90 s->picture_ptr = &s->picture;
91 avcodec_get_frame_defaults(&s->picture);
94 ff_dsputil_init(&s->dsp, avctx);
95 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
100 s->org_height = avctx->coded_height;
101 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
103 build_basic_mjpeg_vlc(s);
105 if (s->extern_huff) {
106 av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
107 init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
108 if (ff_mjpeg_decode_dht(s)) {
109 av_log(avctx, AV_LOG_ERROR,
110 "mjpeg: error using external huffman table, switching back to internal\n");
111 build_basic_mjpeg_vlc(s);
114 if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
115 s->interlace_polarity = 1; /* bottom field first */
116 av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
118 if (avctx->codec->id == CODEC_ID_AMV)
125 /* quantize tables */
126 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
128 int len, index, i, j;
130 len = get_bits(&s->gb, 16) - 2;
133 /* only 8 bit precision handled */
134 if (get_bits(&s->gb, 4) != 0) {
135 av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
138 index = get_bits(&s->gb, 4);
141 av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
142 /* read quant table */
143 for (i = 0; i < 64; i++) {
144 j = s->scantable.permutated[i];
145 s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
148 // XXX FIXME finetune, and perhaps add dc too
149 s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
150 s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
151 av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
152 index, s->qscale[index]);
158 /* decode huffman tables and build VLC decoders */
159 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
161 int len, index, i, class, n, v, code_max;
162 uint8_t bits_table[17];
163 uint8_t val_table[256];
165 len = get_bits(&s->gb, 16) - 2;
170 class = get_bits(&s->gb, 4);
173 index = get_bits(&s->gb, 4);
177 for (i = 1; i <= 16; i++) {
178 bits_table[i] = get_bits(&s->gb, 8);
182 if (len < n || n > 256)
186 for (i = 0; i < n; i++) {
187 v = get_bits(&s->gb, 8);
194 /* build VLC and flush previous vlc if present */
195 ff_free_vlc(&s->vlcs[class][index]);
196 av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
197 class, index, code_max + 1);
198 if (build_vlc(&s->vlcs[class][index], bits_table, val_table,
199 code_max + 1, 0, class > 0) < 0)
203 ff_free_vlc(&s->vlcs[2][index]);
204 if (build_vlc(&s->vlcs[2][index], bits_table, val_table,
205 code_max + 1, 0, 0) < 0)
212 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
214 int len, nb_components, i, width, height, pix_fmt_id;
217 s->upscale_h = s->upscale_v = 0;
219 /* XXX: verify len field validity */
220 len = get_bits(&s->gb, 16);
221 s->bits = get_bits(&s->gb, 8);
225 if (s->bits == 9 && !s->pegasus_rct)
226 s->rct = 1; // FIXME ugly
228 if (s->bits != 8 && !s->lossless) {
229 av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
233 if(s->lossless && s->avctx->lowres){
234 av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
238 height = get_bits(&s->gb, 16);
239 width = get_bits(&s->gb, 16);
241 // HACK for odd_height.mov
242 if (s->interlaced && s->width == width && s->height == height + 1)
245 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
246 if (av_image_check_size(width, height, 0, s->avctx))
249 nb_components = get_bits(&s->gb, 8);
250 if (nb_components <= 0 ||
251 nb_components > MAX_COMPONENTS)
253 if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
254 if (nb_components != s->nb_components) {
255 av_log(s->avctx, AV_LOG_ERROR, "nb_components changing in interlaced picture\n");
256 return AVERROR_INVALIDDATA;
259 if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
260 av_log(s->avctx, AV_LOG_ERROR,
261 "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
264 s->nb_components = nb_components;
267 for (i = 0; i < nb_components; i++) {
269 s->component_id[i] = get_bits(&s->gb, 8) - 1;
270 s->h_count[i] = get_bits(&s->gb, 4);
271 s->v_count[i] = get_bits(&s->gb, 4);
272 /* compute hmax and vmax (only used in interleaved case) */
273 if (s->h_count[i] > s->h_max)
274 s->h_max = s->h_count[i];
275 if (s->v_count[i] > s->v_max)
276 s->v_max = s->v_count[i];
277 if (!s->h_count[i] || !s->v_count[i]) {
278 av_log(s->avctx, AV_LOG_ERROR, "h/v_count is 0\n");
281 s->quant_index[i] = get_bits(&s->gb, 8);
282 if (s->quant_index[i] >= 4)
284 av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
285 i, s->h_count[i], s->v_count[i],
286 s->component_id[i], s->quant_index[i]);
289 if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
290 av_log(s->avctx, AV_LOG_ERROR,
291 "Subsampling in JPEG-LS is not supported.\n");
295 if (s->v_max == 1 && s->h_max == 1 && s->lossless==1 && nb_components==3)
298 /* if different size, realloc/alloc picture */
299 /* XXX: also check h_count and v_count */
300 if (width != s->width || height != s->height) {
301 av_freep(&s->qscale_table);
307 /* test interlaced mode */
308 if (s->first_picture &&
309 s->org_height != 0 &&
310 s->height < ((s->org_height * 3) / 4)) {
312 s->bottom_field = s->interlace_polarity;
313 s->picture_ptr->interlaced_frame = 1;
314 s->picture_ptr->top_field_first = !s->interlace_polarity;
318 avcodec_set_dimensions(s->avctx, width, height);
320 s->qscale_table = av_mallocz((s->width + 15) / 16);
321 s->first_picture = 0;
324 if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
325 if (s->progressive) {
326 av_log_ask_for_sample(s->avctx, "progressively coded interlaced pictures not supported\n");
327 return AVERROR_INVALIDDATA;
332 /* XXX: not complete test ! */
333 pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
334 (s->h_count[1] << 20) | (s->v_count[1] << 16) |
335 (s->h_count[2] << 12) | (s->v_count[2] << 8) |
336 (s->h_count[3] << 4) | s->v_count[3];
337 av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
338 /* NOTE we do not allocate pictures large enough for the possible
339 * padding of h/v_count being 4 */
340 if (!(pix_fmt_id & 0xD0D0D0D0))
341 pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
342 if (!(pix_fmt_id & 0x0D0D0D0D))
343 pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
345 switch (pix_fmt_id) {
348 s->avctx->pix_fmt = PIX_FMT_BGR24;
350 if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
351 s->avctx->pix_fmt = PIX_FMT_GBR24P;
353 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
354 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
357 assert(s->nb_components == 3);
361 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
362 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
364 s->upscale_h = (pix_fmt_id == 0x22122100);
365 s->chroma_height = s->height;
369 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
370 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
371 s->upscale_v = (pix_fmt_id == 0x22211200);
373 s->chroma_height = s->height;
376 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
377 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
380 s->chroma_height = s->height / 2;
384 s->avctx->pix_fmt = PIX_FMT_GRAY8;
386 s->avctx->pix_fmt = PIX_FMT_GRAY16;
391 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
392 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
393 s->upscale_h = (pix_fmt_id == 0x22211100) * 2 + (pix_fmt_id == 0x22112100);
394 s->chroma_height = s->height / 2;
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;
402 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
403 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
404 s->upscale_v = (pix_fmt_id == 0x22121100) + 1;
407 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
408 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
411 av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
414 if ((s->upscale_h || s->upscale_v) && s->avctx->lowres) {
415 av_log(s->avctx, AV_LOG_ERROR, "lowres not supported for weird subsampling\n");
416 return AVERROR_PATCHWELCOME;
419 s->upscale_h = s->upscale_v = 0;
420 if (s->nb_components > 1)
421 s->avctx->pix_fmt = PIX_FMT_RGB24;
422 else if (s->bits <= 8)
423 s->avctx->pix_fmt = PIX_FMT_GRAY8;
425 s->avctx->pix_fmt = PIX_FMT_GRAY16;
428 if (s->picture_ptr->data[0])
429 s->avctx->release_buffer(s->avctx, s->picture_ptr);
431 if (s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0) {
432 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
435 s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
436 s->picture_ptr->key_frame = 1;
439 for (i = 0; i < 3; i++)
440 s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
442 // printf("%d %d %d %d %d %d\n",
443 // s->width, s->height, s->linesize[0], s->linesize[1],
444 // s->interlaced, s->avctx->height);
446 if (len != (8 + (3 * nb_components)))
447 av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
449 /* totally blank picture as progressive JPEG will only add details to it */
450 if (s->progressive) {
451 int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
452 int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
453 for (i = 0; i < s->nb_components; i++) {
454 int size = bw * bh * s->h_count[i] * s->v_count[i];
455 av_freep(&s->blocks[i]);
456 av_freep(&s->last_nnz[i]);
457 s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
458 s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
459 s->block_stride[i] = bw * s->h_count[i];
461 memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
466 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
469 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
471 av_log(s->avctx, AV_LOG_WARNING,
472 "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
473 0, dc_index, &s->vlcs[0][dc_index]);
478 return get_xbits(&s->gb, code);
483 /* decode block and dequantize */
484 static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,
485 int dc_index, int ac_index, int16_t *quant_matrix)
487 int code, i, j, level, val;
490 val = mjpeg_decode_dc(s, dc_index);
492 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
495 val = val * quant_matrix[0] + s->last_dc[component];
496 s->last_dc[component] = val;
500 {OPEN_READER(re, &s->gb);
502 UPDATE_CACHE(re, &s->gb);
503 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
505 i += ((unsigned)code) >> 4;
508 if (code > MIN_CACHE_BITS - 16)
509 UPDATE_CACHE(re, &s->gb);
512 int cache = GET_CACHE(re, &s->gb);
513 int sign = (~cache) >> 31;
514 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
517 LAST_SKIP_BITS(re, &s->gb, code);
520 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
523 j = s->scantable.permutated[i];
524 block[j] = level * quant_matrix[j];
527 CLOSE_READER(re, &s->gb);}
532 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block,
533 int component, int dc_index,
534 int16_t *quant_matrix, int Al)
537 s->dsp.clear_block(block);
538 val = mjpeg_decode_dc(s, dc_index);
540 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
543 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
544 s->last_dc[component] = val;
549 /* decode block and dequantize - progressive JPEG version */
550 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
551 uint8_t *last_nnz, int ac_index,
552 int16_t *quant_matrix,
553 int ss, int se, int Al, int *EOBRUN)
555 int code, i, j, level, val, run;
563 OPEN_READER(re, &s->gb);
564 for (i = ss; ; i++) {
565 UPDATE_CACHE(re, &s->gb);
566 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
568 run = ((unsigned) code) >> 4;
572 if (code > MIN_CACHE_BITS - 16)
573 UPDATE_CACHE(re, &s->gb);
576 int cache = GET_CACHE(re, &s->gb);
577 int sign = (~cache) >> 31;
578 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
581 LAST_SKIP_BITS(re, &s->gb, code);
585 j = s->scantable.permutated[se];
586 block[j] = level * quant_matrix[j] << Al;
589 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
592 j = s->scantable.permutated[i];
593 block[j] = level * quant_matrix[j] << Al;
595 if (run == 0xF) {// ZRL - skip 15 coefficients
598 av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
604 UPDATE_CACHE(re, &s->gb);
605 val += NEG_USR32(GET_CACHE(re, &s->gb), run);
606 LAST_SKIP_BITS(re, &s->gb, run);
613 CLOSE_READER(re, &s->gb);
622 #define REFINE_BIT(j) { \
623 UPDATE_CACHE(re, &s->gb); \
624 sign = block[j] >> 15; \
625 block[j] += SHOW_UBITS(re, &s->gb, 1) * \
626 ((quant_matrix[j] ^ sign) - sign) << Al; \
627 LAST_SKIP_BITS(re, &s->gb, 1); \
635 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
640 j = s->scantable.permutated[i]; \
643 else if (run-- == 0) \
647 /* decode block and dequantize - progressive JPEG refinement pass */
648 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block,
650 int ac_index, int16_t *quant_matrix,
651 int ss, int se, int Al, int *EOBRUN)
653 int code, i = ss, j, sign, val, run;
654 int last = FFMIN(se, *last_nnz);
656 OPEN_READER(re, &s->gb);
661 UPDATE_CACHE(re, &s->gb);
662 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
665 run = ((unsigned) code) >> 4;
666 UPDATE_CACHE(re, &s->gb);
667 val = SHOW_UBITS(re, &s->gb, 1);
668 LAST_SKIP_BITS(re, &s->gb, 1);
670 j = s->scantable.permutated[i];
672 block[j] = ((quant_matrix[j]^val) - val) << Al;
676 CLOSE_READER(re, &s->gb);
680 run = ((unsigned) code) >> 4;
687 UPDATE_CACHE(re, &s->gb);
688 run += SHOW_UBITS(re, &s->gb, val);
689 LAST_SKIP_BITS(re, &s->gb, val);
701 for (; i <= last; i++) {
702 j = s->scantable.permutated[i];
706 CLOSE_READER(re, &s->gb);
713 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int predictor, int point_transform)
716 uint16_t (*buffer)[4];
717 int left[3], top[3], topleft[3];
718 const int linesize = s->linesize[0];
719 const int mask = (1 << s->bits) - 1;
723 s->restart_count = s->restart_interval;
725 av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
726 (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
727 buffer = s->ljpeg_buffer;
729 for (i = 0; i < 3; i++)
730 buffer[0][i] = 1 << (s->bits - 1);
732 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
733 uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
735 if (s->interlaced && s->bottom_field)
736 ptr += linesize >> 1;
738 for (i = 0; i < 3; i++)
739 top[i] = left[i] = topleft[i] = buffer[0][i];
741 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
742 int modified_predictor = predictor;
744 if (s->restart_interval && !s->restart_count){
745 s->restart_count = s->restart_interval;
749 top[i] = left[i]= topleft[i]= 1 << (s->bits - 1);
751 if (mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || !mb_x)
752 modified_predictor = 1;
754 for (i=0;i<nb_components;i++) {
758 top[i] = buffer[mb_x][i];
760 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
762 dc = mjpeg_decode_dc(s, s->dc_index[i]);
766 left[i] = buffer[mb_x][i] =
767 mask & (pred + (dc << point_transform));
770 if (s->restart_interval && !--s->restart_count) {
771 align_get_bits(&s->gb);
772 skip_bits(&s->gb, 16); /* skip RSTn */
777 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
778 ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
779 ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
780 ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
782 } else if (s->pegasus_rct) {
783 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
784 ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
785 ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
786 ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
789 for(i=0; i<nb_components; i++) {
790 int c= s->comp_index[i];
791 for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
792 ptr[3*mb_x+2-c] = buffer[mb_x][i];
800 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
804 const int nb_components=s->nb_components;
805 int bits= (s->bits+7)&~7;
809 point_transform += bits - s->bits;
811 av_assert0(nb_components==1 || nb_components==3);
813 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
814 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
815 if (s->restart_interval && !s->restart_count){
816 s->restart_count = s->restart_interval;
821 if(!mb_x || mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || s->interlaced){
822 int toprow = mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x;
823 int leftcol = !mb_x || mb_y == resync_mb_y && mb_x == resync_mb_x;
824 for (i = 0; i < nb_components; i++) {
827 int n, h, v, x, y, c, j, linesize;
829 c = s->comp_index[i];
834 linesize= s->linesize[c];
836 if(bits>8) linesize /= 2;
841 dc = mjpeg_decode_dc(s, s->dc_index[i]);
845 ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
848 pred= 1 << (bits - 1);
854 pred= ptr[-linesize];
856 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
860 if (s->interlaced && s->bottom_field)
861 ptr += linesize >> 1;
862 pred &= (-1)<<(8-s->bits);
863 *ptr= pred + (dc << point_transform);
865 ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
868 pred= 1 << (bits - 1);
874 pred= ptr16[-linesize];
876 PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
880 if (s->interlaced && s->bottom_field)
881 ptr16 += linesize >> 1;
882 pred &= (-1)<<(16-s->bits);
883 *ptr16= pred + (dc << point_transform);
892 for (i = 0; i < nb_components; i++) {
895 int n, h, v, x, y, c, j, linesize, dc;
897 c = s->comp_index[i];
902 linesize = s->linesize[c];
904 if(bits>8) linesize /= 2;
906 for (j = 0; j < n; j++) {
909 dc = mjpeg_decode_dc(s, s->dc_index[i]);
913 ptr = s->picture.data[c] +
914 (linesize * (v * mb_y + y)) +
915 (h * mb_x + x); //FIXME optimize this crap
916 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
918 pred &= (-1)<<(8-s->bits);
919 *ptr = pred + (dc << point_transform);
921 ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
922 PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
924 pred &= (-1)<<(16-s->bits);
925 *ptr16= pred + (dc << point_transform);
935 if (s->restart_interval && !--s->restart_count) {
936 align_get_bits(&s->gb);
937 skip_bits(&s->gb, 16); /* skip RSTn */
944 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
945 int Al, const uint8_t *mb_bitmask,
946 const AVFrame *reference)
949 uint8_t *data[MAX_COMPONENTS];
950 const uint8_t *reference_data[MAX_COMPONENTS];
951 int linesize[MAX_COMPONENTS];
952 GetBitContext mb_bitmask_gb;
955 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
957 if (s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
958 av_log(s->avctx, AV_LOG_ERROR,
959 "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
962 if (s->flipped && s->avctx->lowres) {
963 av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with lowres\n");
967 for (i = 0; i < nb_components; i++) {
968 int c = s->comp_index[i];
969 data[c] = s->picture_ptr->data[c];
970 reference_data[c] = reference ? reference->data[c] : NULL;
971 linesize[c] = s->linesize[c];
972 s->coefs_finished[c] |= 1;
974 // picture should be flipped upside-down for this codec
975 int offset = (linesize[c] * (s->v_scount[i] *
976 (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
978 reference_data[c] += offset;
983 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
984 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
985 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
987 if (s->restart_interval && !s->restart_count)
988 s->restart_count = s->restart_interval;
990 if (get_bits_left(&s->gb) < 0) {
991 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
992 -get_bits_left(&s->gb));
995 for (i = 0; i < nb_components; i++) {
997 int n, h, v, x, y, c, j;
1000 c = s->comp_index[i];
1005 for (j = 0; j < n; j++) {
1006 block_offset = ((linesize[c] * (v * mb_y + y) * 8) +
1007 (h * mb_x + x) * 8);
1009 if (s->interlaced && s->bottom_field)
1010 block_offset += linesize[c] >> 1;
1011 ptr = data[c] + block_offset;
1012 if (!s->progressive) {
1014 copy_block8(ptr, reference_data[c] + block_offset,
1015 linesize[c], linesize[c], 8);
1017 s->dsp.clear_block(s->block);
1018 if (decode_block(s, s->block, i,
1019 s->dc_index[i], s->ac_index[i],
1020 s->quant_matrixes[s->quant_index[c]]) < 0) {
1021 av_log(s->avctx, AV_LOG_ERROR,
1022 "error y=%d x=%d\n", mb_y, mb_x);
1025 s->dsp.idct_put(ptr, linesize[c], s->block);
1028 int block_idx = s->block_stride[c] * (v * mb_y + y) +
1030 DCTELEM *block = s->blocks[c][block_idx];
1032 block[0] += get_bits1(&s->gb) *
1033 s->quant_matrixes[s->quant_index[c]][0] << Al;
1034 else if (decode_dc_progressive(s, block, i, s->dc_index[i],
1035 s->quant_matrixes[s->quant_index[c]],
1037 av_log(s->avctx, AV_LOG_ERROR,
1038 "error y=%d x=%d\n", mb_y, mb_x);
1042 // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n",
1044 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n",
1045 // mb_x, mb_y, x, y, c, s->bottom_field,
1046 // (v * mb_y + y) * 8, (h * mb_x + x) * 8);
1054 if (s->restart_interval) {
1056 if(s->restart_count == 0 && s->avctx->codec_id == CODEC_ID_THP){
1057 align_get_bits(&s->gb);
1058 for (i = 0; i < nb_components; i++) /* reset dc */
1059 s->last_dc[i] = 1024;
1062 i = 8 + ((-get_bits_count(&s->gb)) & 7);
1064 if (show_bits(&s->gb, i) == (1 << i) - 1) {
1065 int pos = get_bits_count(&s->gb);
1066 align_get_bits(&s->gb);
1067 while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
1068 skip_bits(&s->gb, 8);
1069 if (get_bits_left(&s->gb) >= 8 && (get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
1070 for (i = 0; i < nb_components; i++) /* reset dc */
1071 s->last_dc[i] = 1024;
1073 skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
1081 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
1082 int se, int Ah, int Al)
1086 int c = s->comp_index[0];
1087 uint8_t *data = s->picture.data[c];
1088 int linesize = s->linesize[c];
1090 int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
1093 s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
1094 last_scan = !~s->coefs_finished[c];
1097 if (s->interlaced && s->bottom_field)
1098 data += linesize >> 1;
1100 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1101 uint8_t *ptr = data + (mb_y * linesize * 8 >> s->avctx->lowres);
1102 int block_idx = mb_y * s->block_stride[c];
1103 DCTELEM (*block)[64] = &s->blocks[c][block_idx];
1104 uint8_t *last_nnz = &s->last_nnz[c][block_idx];
1105 for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
1108 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
1109 quant_matrix, ss, se, Al, &EOBRUN);
1111 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
1112 quant_matrix, ss, se, Al, &EOBRUN);
1114 av_log(s->avctx, AV_LOG_ERROR,
1115 "error y=%d x=%d\n", mb_y, mb_x);
1120 s->dsp.idct_put(ptr, linesize, *block);
1121 ptr += 8 >> s->avctx->lowres;
1128 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
1129 const AVFrame *reference)
1131 int len, nb_components, i, h, v, predictor, point_transform;
1133 const int block_size = s->lossless ? 1 : 8;
1134 int ilv, prev_shift;
1136 if (!s->got_picture) {
1137 av_log(s->avctx, AV_LOG_WARNING,
1138 "Can not process SOS before SOF, skipping\n");
1142 av_assert0(s->picture_ptr->data[0]);
1143 /* XXX: verify len field validity */
1144 len = get_bits(&s->gb, 16);
1145 nb_components = get_bits(&s->gb, 8);
1146 if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
1147 av_log(s->avctx, AV_LOG_ERROR,
1148 "decode_sos: nb_components (%d) unsupported\n", nb_components);
1151 if (len != 6 + 2 * nb_components) {
1152 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1155 for (i = 0; i < nb_components; i++) {
1156 id = get_bits(&s->gb, 8) - 1;
1157 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1158 /* find component index */
1159 for (index = 0; index < s->nb_components; index++)
1160 if (id == s->component_id[index])
1162 if (index == s->nb_components) {
1163 av_log(s->avctx, AV_LOG_ERROR,
1164 "decode_sos: index(%d) out of components\n", index);
1167 /* Metasoft MJPEG codec has Cb and Cr swapped */
1168 if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1169 && nb_components == 3 && s->nb_components == 3 && i)
1172 if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == PIX_FMT_GBR24P)
1174 if(nb_components == 1 && s->nb_components == 3 && s->avctx->pix_fmt == PIX_FMT_GBR24P)
1175 index = (index+2)%3;
1177 s->comp_index[i] = index;
1179 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1180 s->h_scount[i] = s->h_count[index];
1181 s->v_scount[i] = s->v_count[index];
1183 s->dc_index[i] = get_bits(&s->gb, 4);
1184 s->ac_index[i] = get_bits(&s->gb, 4);
1186 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1187 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1189 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))
1193 predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1194 ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1195 if(s->avctx->codec_tag != AV_RL32("CJPG")){
1196 prev_shift = get_bits(&s->gb, 4); /* Ah */
1197 point_transform = get_bits(&s->gb, 4); /* Al */
1199 prev_shift = point_transform = 0;
1201 for (i = 0; i < nb_components; i++)
1202 s->last_dc[i] = 1024;
1204 if (nb_components > 1) {
1205 /* interleaved stream */
1206 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1207 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1208 } else if (!s->ls) { /* skip this for JPEG-LS */
1209 h = s->h_max / s->h_scount[0];
1210 v = s->v_max / s->v_scount[0];
1211 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1212 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1213 s->nb_blocks[0] = 1;
1218 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1219 av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n",
1220 s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1221 predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
1222 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
1225 /* mjpeg-b can have padding bytes between sos and image data, skip them */
1226 for (i = s->mjpb_skiptosod; i > 0; i--)
1227 skip_bits(&s->gb, 8);
1230 av_assert0(s->picture_ptr == &s->picture);
1231 if (CONFIG_JPEGLS_DECODER && s->ls) {
1233 // reset_ls_coding_parameters(s, 0);
1235 if (ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
1239 if (ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform) < 0)
1242 if (ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
1247 if (s->progressive && predictor) {
1248 av_assert0(s->picture_ptr == &s->picture);
1249 if (mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift,
1250 point_transform) < 0)
1253 if (mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
1254 mb_bitmask, reference) < 0)
1261 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1265 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1267 if (get_bits(&s->gb, 16) != 4)
1269 s->restart_interval = get_bits(&s->gb, 16);
1270 s->restart_count = 0;
1271 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
1272 s->restart_interval);
1277 static int mjpeg_decode_app(MJpegDecodeContext *s)
1281 len = get_bits(&s->gb, 16);
1284 if (8 * len > get_bits_left(&s->gb))
1287 id = get_bits_long(&s->gb, 32);
1288 id = av_be2ne32(id);
1291 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1292 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1294 /* Buggy AVID, it puts EOI only at every 10th frame. */
1295 /* Also, this fourcc is used by non-avid files too, it holds some
1296 information, but it's always present in AVID-created files. */
1297 if (id == AV_RL32("AVI1")) {
1303 4bytes field_size_less_padding
1306 // if (s->first_picture)
1307 // printf("mjpeg: workarounding buggy AVID\n");
1308 i = get_bits(&s->gb, 8); len--;
1309 av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
1311 skip_bits(&s->gb, 8);
1312 skip_bits(&s->gb, 32);
1313 skip_bits(&s->gb, 32);
1316 // if (s->interlace_polarity)
1317 // printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
1323 if (id == AV_RL32("JFIF")) {
1324 int t_w, t_h, v1, v2;
1325 skip_bits(&s->gb, 8); /* the trailing zero-byte */
1326 v1 = get_bits(&s->gb, 8);
1327 v2 = get_bits(&s->gb, 8);
1328 skip_bits(&s->gb, 8);
1330 s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
1331 s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
1333 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1334 av_log(s->avctx, AV_LOG_INFO,
1335 "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1337 s->avctx->sample_aspect_ratio.num,
1338 s->avctx->sample_aspect_ratio.den);
1340 t_w = get_bits(&s->gb, 8);
1341 t_h = get_bits(&s->gb, 8);
1343 /* skip thumbnail */
1344 if (len -10 - (t_w * t_h * 3) > 0)
1345 len -= t_w * t_h * 3;
1351 if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
1352 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1353 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1354 skip_bits(&s->gb, 16); /* version */
1355 skip_bits(&s->gb, 16); /* flags0 */
1356 skip_bits(&s->gb, 16); /* flags1 */
1357 skip_bits(&s->gb, 8); /* transform */
1362 if (id == AV_RL32("LJIF")) {
1363 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1364 av_log(s->avctx, AV_LOG_INFO,
1365 "Pegasus lossless jpeg header found\n");
1366 skip_bits(&s->gb, 16); /* version ? */
1367 skip_bits(&s->gb, 16); /* unknwon always 0? */
1368 skip_bits(&s->gb, 16); /* unknwon always 0? */
1369 skip_bits(&s->gb, 16); /* unknwon always 0? */
1370 switch (get_bits(&s->gb, 8)) {
1380 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1387 if ((s->start_code == APP1) && (len > (0x28 - 8))) {
1388 id = get_bits_long(&s->gb, 32);
1389 id = av_be2ne32(id);
1392 if (id == AV_RL32("mjpg")) {
1394 skip_bits(&s->gb, 32); /* field size */
1395 skip_bits(&s->gb, 32); /* pad field size */
1396 skip_bits(&s->gb, 32); /* next off */
1397 skip_bits(&s->gb, 32); /* quant off */
1398 skip_bits(&s->gb, 32); /* huff off */
1399 skip_bits(&s->gb, 32); /* image off */
1400 skip_bits(&s->gb, 32); /* scan off */
1401 skip_bits(&s->gb, 32); /* data off */
1403 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1404 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1409 /* slow but needed for extreme adobe jpegs */
1411 av_log(s->avctx, AV_LOG_ERROR,
1412 "mjpeg: error, decode_app parser read over the end\n");
1414 skip_bits(&s->gb, 8);
1419 static int mjpeg_decode_com(MJpegDecodeContext *s)
1421 int len = get_bits(&s->gb, 16);
1422 if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
1423 char *cbuf = av_malloc(len - 1);
1426 for (i = 0; i < len - 2; i++)
1427 cbuf[i] = get_bits(&s->gb, 8);
1428 if (i > 0 && cbuf[i - 1] == '\n')
1433 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1434 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1436 /* buggy avid, it puts EOI only at every 10th frame */
1437 if (!strcmp(cbuf, "AVID")) {
1439 // if (s->first_picture)
1440 // printf("mjpeg: workarounding buggy AVID\n");
1441 } else if (!strcmp(cbuf, "CS=ITU601"))
1443 else if ((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
1444 (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
1454 /* return the 8 bit start code value and update the search
1455 state. Return -1 if no start code found */
1456 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1458 const uint8_t *buf_ptr;
1463 buf_ptr = *pbuf_ptr;
1464 while (buf_ptr < buf_end) {
1467 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1475 av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1476 *pbuf_ptr = buf_ptr;
1480 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1481 const uint8_t **buf_ptr, const uint8_t *buf_end,
1482 const uint8_t **unescaped_buf_ptr,
1483 int *unescaped_buf_size)
1486 start_code = find_marker(buf_ptr, buf_end);
1488 av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
1490 return AVERROR(ENOMEM);
1492 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1493 if (start_code == SOS && !s->ls) {
1494 const uint8_t *src = *buf_ptr;
1495 uint8_t *dst = s->buffer;
1497 while (src < buf_end) {
1498 uint8_t x = *(src++);
1501 if (s->avctx->codec_id != CODEC_ID_THP) {
1503 while (src < buf_end && x == 0xff)
1506 if (x >= 0xd0 && x <= 0xd7)
1513 *unescaped_buf_ptr = s->buffer;
1514 *unescaped_buf_size = dst - s->buffer;
1516 av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1517 (buf_end - *buf_ptr) - (dst - s->buffer));
1518 } else if (start_code == SOS && s->ls) {
1519 const uint8_t *src = *buf_ptr;
1520 uint8_t *dst = s->buffer;
1528 while (src + t < buf_end) {
1529 uint8_t x = src[t++];
1531 while ((src + t < buf_end) && x == 0xff)
1540 init_put_bits(&pb, dst, t);
1542 /* unescape bitstream */
1544 uint8_t x = src[b++];
1545 put_bits(&pb, 8, x);
1548 put_bits(&pb, 7, x);
1552 flush_put_bits(&pb);
1554 *unescaped_buf_ptr = dst;
1555 *unescaped_buf_size = (bit_count + 7) >> 3;
1557 *unescaped_buf_ptr = *buf_ptr;
1558 *unescaped_buf_size = buf_end - *buf_ptr;
1564 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
1567 const uint8_t *buf = avpkt->data;
1568 int buf_size = avpkt->size;
1569 MJpegDecodeContext *s = avctx->priv_data;
1570 const uint8_t *buf_end, *buf_ptr;
1571 const uint8_t *unescaped_buf_ptr;
1572 int unescaped_buf_size;
1575 AVFrame *picture = data;
1577 s->got_picture = 0; // picture from previous image can not be reused
1579 buf_end = buf + buf_size;
1580 while (buf_ptr < buf_end) {
1581 /* find start next marker */
1582 start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1584 &unescaped_buf_size);
1586 if (start_code < 0) {
1588 } else if (unescaped_buf_size > (1U<<29)) {
1589 av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
1590 start_code, unescaped_buf_size, buf_size);
1591 return AVERROR_INVALIDDATA;
1593 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
1594 start_code, buf_end - buf_ptr);
1596 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
1598 s->start_code = start_code;
1599 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1600 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1602 /* process markers */
1603 if (start_code >= 0xd0 && start_code <= 0xd7)
1604 av_log(avctx, AV_LOG_DEBUG,
1605 "restart marker: %d\n", start_code & 0x0f);
1607 else if (start_code >= APP0 && start_code <= APP15)
1608 mjpeg_decode_app(s);
1610 else if (start_code == COM)
1611 mjpeg_decode_com(s);
1613 switch (start_code) {
1615 s->restart_interval = 0;
1616 s->restart_count = 0;
1617 /* nothing to do on SOI */
1620 ff_mjpeg_decode_dqt(s);
1623 if (ff_mjpeg_decode_dht(s) < 0) {
1624 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1633 if (ff_mjpeg_decode_sof(s) < 0)
1640 if (ff_mjpeg_decode_sof(s) < 0)
1647 if (ff_mjpeg_decode_sof(s) < 0)
1654 if (ff_mjpeg_decode_sof(s) < 0)
1658 if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
1664 if (!s->got_picture) {
1665 av_log(avctx, AV_LOG_WARNING,
1666 "Found EOI before any SOF, ignoring\n");
1669 if (s->interlaced) {
1670 s->bottom_field ^= 1;
1671 /* if not bottom field, do not output image yet */
1672 if (s->bottom_field == !s->interlace_polarity)
1675 *picture = *s->picture_ptr;
1676 *data_size = sizeof(AVFrame);
1679 picture->quality = FFMAX3(s->qscale[0],
1682 picture->qstride = 0;
1683 picture->qscale_table = s->qscale_table;
1684 memset(picture->qscale_table, picture->quality,
1685 (s->width + 15) / 16);
1686 if (avctx->debug & FF_DEBUG_QP)
1687 av_log(avctx, AV_LOG_DEBUG,
1688 "QP: %d\n", picture->quality);
1689 picture->quality *= FF_QP2LAMBDA;
1694 if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
1695 (avctx->err_recognition & AV_EF_EXPLODE))
1696 return AVERROR_INVALIDDATA;
1699 mjpeg_decode_dri(s);
1711 av_log(avctx, AV_LOG_ERROR,
1712 "mjpeg: unsupported coding type (%x)\n", start_code);
1715 // printf("mjpeg: unsupported marker (%x)\n", start_code);
1719 /* eof process start code */
1720 buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
1721 av_log(avctx, AV_LOG_DEBUG,
1722 "marker parser used %d bytes (%d bits)\n",
1723 (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
1726 if (s->got_picture) {
1727 av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1730 av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1734 uint8_t *line = s->picture_ptr->data[s->upscale_h];
1735 av_assert0(avctx->pix_fmt == PIX_FMT_YUVJ444P ||
1736 avctx->pix_fmt == PIX_FMT_YUV444P ||
1737 avctx->pix_fmt == PIX_FMT_YUVJ440P ||
1738 avctx->pix_fmt == PIX_FMT_YUV440P);
1739 for (i = 0; i < s->chroma_height; i++) {
1740 for (index = s->width - 1; index; index--)
1741 line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
1742 line += s->linesize[s->upscale_h];
1746 uint8_t *dst = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(s->height - 1) * s->linesize[s->upscale_v]];
1747 av_assert0(avctx->pix_fmt == PIX_FMT_YUVJ444P ||
1748 avctx->pix_fmt == PIX_FMT_YUV444P ||
1749 avctx->pix_fmt == PIX_FMT_YUVJ422P ||
1750 avctx->pix_fmt == PIX_FMT_YUV422P);
1751 for (i = s->height - 1; i; i--) {
1752 uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[i / 2 * s->linesize[s->upscale_v]];
1753 uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(i + 1) / 2 * s->linesize[s->upscale_v]];
1755 memcpy(dst, src1, s->width);
1757 for (index = 0; index < s->width; index++)
1758 dst[index] = (src1[index] + src2[index]) >> 1;
1760 dst -= s->linesize[s->upscale_v];
1763 av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n",
1765 // return buf_end - buf_ptr;
1766 return buf_ptr - buf;
1769 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1771 MJpegDecodeContext *s = avctx->priv_data;
1774 if (s->picture_ptr && s->picture_ptr->data[0])
1775 avctx->release_buffer(avctx, s->picture_ptr);
1778 av_free(s->qscale_table);
1779 av_freep(&s->ljpeg_buffer);
1780 s->ljpeg_buffer_size = 0;
1782 for (i = 0; i < 3; i++) {
1783 for (j = 0; j < 4; j++)
1784 ff_free_vlc(&s->vlcs[i][j]);
1786 for (i = 0; i < MAX_COMPONENTS; i++) {
1787 av_freep(&s->blocks[i]);
1788 av_freep(&s->last_nnz[i]);
1793 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1794 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1795 static const AVOption options[] = {
1796 { "extern_huff", "Use external huffman table.",
1797 OFFSET(extern_huff), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD },
1801 static const AVClass mjpegdec_class = {
1802 .class_name = "MJPEG decoder",
1803 .item_name = av_default_item_name,
1805 .version = LIBAVUTIL_VERSION_INT,
1808 AVCodec ff_mjpeg_decoder = {
1810 .type = AVMEDIA_TYPE_VIDEO,
1811 .id = CODEC_ID_MJPEG,
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,
1817 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1818 .priv_class = &mjpegdec_class,
1821 AVCodec ff_thp_decoder = {
1823 .type = AVMEDIA_TYPE_VIDEO,
1825 .priv_data_size = sizeof(MJpegDecodeContext),
1826 .init = ff_mjpeg_decode_init,
1827 .close = ff_mjpeg_decode_end,
1828 .decode = ff_mjpeg_decode_frame,
1829 .capabilities = CODEC_CAP_DR1,
1830 .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),