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 Libav.
13 * Libav 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 * Libav 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 Libav; 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/opt.h"
42 #include "jpeglsdec.h"
45 static int build_vlc(VLC *vlc, const uint8_t *bits_table,
46 const uint8_t *val_table, int nb_codes,
47 int use_static, int is_ac)
49 uint8_t huff_size[256] = { 0 };
50 uint16_t huff_code[256];
51 uint16_t huff_sym[256];
54 assert(nb_codes <= 256);
56 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
58 for (i = 0; i < 256; i++)
59 huff_sym[i] = i + 16 * is_ac;
62 huff_sym[0] = 16 * 256;
64 return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
65 huff_code, 2, 2, huff_sym, 2, 2, use_static);
68 static void build_basic_mjpeg_vlc(MJpegDecodeContext *s)
70 build_vlc(&s->vlcs[0][0], avpriv_mjpeg_bits_dc_luminance,
71 avpriv_mjpeg_val_dc, 12, 0, 0);
72 build_vlc(&s->vlcs[0][1], avpriv_mjpeg_bits_dc_chrominance,
73 avpriv_mjpeg_val_dc, 12, 0, 0);
74 build_vlc(&s->vlcs[1][0], avpriv_mjpeg_bits_ac_luminance,
75 avpriv_mjpeg_val_ac_luminance, 251, 0, 1);
76 build_vlc(&s->vlcs[1][1], avpriv_mjpeg_bits_ac_chrominance,
77 avpriv_mjpeg_val_ac_chrominance, 251, 0, 1);
78 build_vlc(&s->vlcs[2][0], avpriv_mjpeg_bits_ac_luminance,
79 avpriv_mjpeg_val_ac_luminance, 251, 0, 0);
80 build_vlc(&s->vlcs[2][1], avpriv_mjpeg_bits_ac_chrominance,
81 avpriv_mjpeg_val_ac_chrominance, 251, 0, 0);
84 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
86 MJpegDecodeContext *s = avctx->priv_data;
89 s->picture_ptr = &s->picture;
92 ff_dsputil_init(&s->dsp, avctx);
93 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
98 s->org_height = avctx->coded_height;
99 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
101 build_basic_mjpeg_vlc(s);
103 if (s->extern_huff) {
105 av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
106 init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
107 if ((ret = ff_mjpeg_decode_dht(s))) {
108 av_log(avctx, AV_LOG_ERROR,
109 "mjpeg: error using external huffman table\n");
113 if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
114 s->interlace_polarity = 1; /* bottom field first */
115 av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
117 if (avctx->codec->id == AV_CODEC_ID_AMV)
124 /* quantize tables */
125 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
127 int len, index, i, j;
129 len = get_bits(&s->gb, 16) - 2;
132 /* only 8 bit precision handled */
133 if (get_bits(&s->gb, 4) != 0) {
134 av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
137 index = get_bits(&s->gb, 4);
140 av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
141 /* read quant table */
142 for (i = 0; i < 64; i++) {
143 j = s->scantable.permutated[i];
144 s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
147 // XXX FIXME finetune, and perhaps add dc too
148 s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
149 s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
150 av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
151 index, s->qscale[index]);
157 /* decode huffman tables and build VLC decoders */
158 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
160 int len, index, i, class, n, v, code_max;
161 uint8_t bits_table[17];
162 uint8_t val_table[256];
165 len = get_bits(&s->gb, 16) - 2;
169 return AVERROR_INVALIDDATA;
170 class = get_bits(&s->gb, 4);
172 return AVERROR_INVALIDDATA;
173 index = get_bits(&s->gb, 4);
175 return AVERROR_INVALIDDATA;
177 for (i = 1; i <= 16; i++) {
178 bits_table[i] = get_bits(&s->gb, 8);
182 if (len < n || n > 256)
183 return AVERROR_INVALIDDATA;
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 ((ret = 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 ((ret = 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;
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 height = get_bits(&s->gb, 16);
231 width = get_bits(&s->gb, 16);
233 // HACK for odd_height.mov
234 if (s->interlaced && s->width == width && s->height == height + 1)
237 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
238 if (av_image_check_size(width, height, 0, s->avctx))
239 return AVERROR_INVALIDDATA;
241 nb_components = get_bits(&s->gb, 8);
242 if (nb_components <= 0 ||
243 nb_components > MAX_COMPONENTS)
245 if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
246 av_log_missing_feature(s->avctx,
247 "For JPEG-LS anything except <= 8 bits/component"
248 " or 16-bit gray", 0);
249 return AVERROR_PATCHWELCOME;
251 s->nb_components = nb_components;
254 for (i = 0; i < nb_components; i++) {
256 s->component_id[i] = get_bits(&s->gb, 8) - 1;
257 s->h_count[i] = get_bits(&s->gb, 4);
258 s->v_count[i] = get_bits(&s->gb, 4);
259 /* compute hmax and vmax (only used in interleaved case) */
260 if (s->h_count[i] > s->h_max)
261 s->h_max = s->h_count[i];
262 if (s->v_count[i] > s->v_max)
263 s->v_max = s->v_count[i];
264 s->quant_index[i] = get_bits(&s->gb, 8);
265 if (s->quant_index[i] >= 4)
266 return AVERROR_INVALIDDATA;
267 av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
268 i, s->h_count[i], s->v_count[i],
269 s->component_id[i], s->quant_index[i]);
272 if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
273 av_log_missing_feature(s->avctx, "Subsampling in JPEG-LS", 0);
274 return AVERROR_PATCHWELCOME;
277 if (s->v_max == 1 && s->h_max == 1 && s->lossless == 1)
280 /* if different size, realloc/alloc picture */
281 /* XXX: also check h_count and v_count */
282 if (width != s->width || height != s->height) {
283 av_freep(&s->qscale_table);
289 /* test interlaced mode */
290 if (s->first_picture &&
291 s->org_height != 0 &&
292 s->height < ((s->org_height * 3) / 4)) {
294 s->bottom_field = s->interlace_polarity;
295 s->picture_ptr->interlaced_frame = 1;
296 s->picture_ptr->top_field_first = !s->interlace_polarity;
300 avcodec_set_dimensions(s->avctx, width, height);
302 s->qscale_table = av_mallocz((s->width + 15) / 16);
303 s->first_picture = 0;
306 if (!(s->interlaced && (s->bottom_field == !s->interlace_polarity))) {
307 /* XXX: not complete test ! */
308 pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
309 (s->h_count[1] << 20) | (s->v_count[1] << 16) |
310 (s->h_count[2] << 12) | (s->v_count[2] << 8) |
311 (s->h_count[3] << 4) | s->v_count[3];
312 av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
313 /* NOTE we do not allocate pictures large enough for the possible
314 * padding of h/v_count being 4 */
315 if (!(pix_fmt_id & 0xD0D0D0D0))
316 pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
317 if (!(pix_fmt_id & 0x0D0D0D0D))
318 pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
320 switch (pix_fmt_id) {
323 s->avctx->pix_fmt = AV_PIX_FMT_BGRA;
325 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
326 assert(s->nb_components == 3);
329 s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
332 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV440P : AV_PIX_FMT_YUVJ440P;
335 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
338 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUVJ420P;
341 av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
342 return AVERROR_PATCHWELCOME;
345 if (s->nb_components > 1)
346 s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
347 else if (s->bits <= 8)
348 s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
350 s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
353 if (s->picture_ptr->data[0])
354 s->avctx->release_buffer(s->avctx, s->picture_ptr);
356 if (s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0) {
357 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
360 s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
361 s->picture_ptr->key_frame = 1;
364 for (i = 0; i < 3; i++)
365 s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
367 av_dlog(s->avctx, "%d %d %d %d %d %d\n",
368 s->width, s->height, s->linesize[0], s->linesize[1],
369 s->interlaced, s->avctx->height);
371 if (len != (8 + (3 * nb_components)))
372 av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
375 /* totally blank picture as progressive JPEG will only add details to it */
376 if (s->progressive) {
377 int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
378 int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
379 for (i = 0; i < s->nb_components; i++) {
380 int size = bw * bh * s->h_count[i] * s->v_count[i];
381 av_freep(&s->blocks[i]);
382 av_freep(&s->last_nnz[i]);
383 s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
384 s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
385 s->block_stride[i] = bw * s->h_count[i];
387 memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
392 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
395 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
397 av_log(s->avctx, AV_LOG_WARNING,
398 "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
399 0, dc_index, &s->vlcs[0][dc_index]);
404 return get_xbits(&s->gb, code);
409 /* decode block and dequantize */
410 static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,
411 int dc_index, int ac_index, int16_t *quant_matrix)
413 int code, i, j, level, val;
416 val = mjpeg_decode_dc(s, dc_index);
418 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
419 return AVERROR_INVALIDDATA;
421 val = val * quant_matrix[0] + s->last_dc[component];
422 s->last_dc[component] = val;
426 {OPEN_READER(re, &s->gb);
428 UPDATE_CACHE(re, &s->gb);
429 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
431 i += ((unsigned)code) >> 4;
434 if (code > MIN_CACHE_BITS - 16)
435 UPDATE_CACHE(re, &s->gb);
438 int cache = GET_CACHE(re, &s->gb);
439 int sign = (~cache) >> 31;
440 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
443 LAST_SKIP_BITS(re, &s->gb, code);
446 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
447 return AVERROR_INVALIDDATA;
449 j = s->scantable.permutated[i];
450 block[j] = level * quant_matrix[j];
453 CLOSE_READER(re, &s->gb);}
458 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block,
459 int component, int dc_index,
460 int16_t *quant_matrix, int Al)
463 s->dsp.clear_block(block);
464 val = mjpeg_decode_dc(s, dc_index);
466 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
467 return AVERROR_INVALIDDATA;
469 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
470 s->last_dc[component] = val;
475 /* decode block and dequantize - progressive JPEG version */
476 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
477 uint8_t *last_nnz, int ac_index,
478 int16_t *quant_matrix,
479 int ss, int se, int Al, int *EOBRUN)
481 int code, i, j, level, val, run;
489 OPEN_READER(re, &s->gb);
490 for (i = ss; ; i++) {
491 UPDATE_CACHE(re, &s->gb);
492 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
494 run = ((unsigned) code) >> 4;
498 if (code > MIN_CACHE_BITS - 16)
499 UPDATE_CACHE(re, &s->gb);
502 int cache = GET_CACHE(re, &s->gb);
503 int sign = (~cache) >> 31;
504 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
507 LAST_SKIP_BITS(re, &s->gb, code);
511 j = s->scantable.permutated[se];
512 block[j] = level * quant_matrix[j] << Al;
515 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
516 return AVERROR_INVALIDDATA;
518 j = s->scantable.permutated[i];
519 block[j] = level * quant_matrix[j] << Al;
521 if (run == 0xF) {// ZRL - skip 15 coefficients
524 av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
525 return AVERROR_INVALIDDATA;
530 UPDATE_CACHE(re, &s->gb);
531 val += NEG_USR32(GET_CACHE(re, &s->gb), run);
532 LAST_SKIP_BITS(re, &s->gb, run);
539 CLOSE_READER(re, &s->gb);
548 #define REFINE_BIT(j) { \
549 UPDATE_CACHE(re, &s->gb); \
550 sign = block[j] >> 15; \
551 block[j] += SHOW_UBITS(re, &s->gb, 1) * \
552 ((quant_matrix[j] ^ sign) - sign) << Al; \
553 LAST_SKIP_BITS(re, &s->gb, 1); \
561 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
566 j = s->scantable.permutated[i]; \
569 else if (run-- == 0) \
573 /* decode block and dequantize - progressive JPEG refinement pass */
574 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block,
576 int ac_index, int16_t *quant_matrix,
577 int ss, int se, int Al, int *EOBRUN)
579 int code, i = ss, j, sign, val, run;
580 int last = FFMIN(se, *last_nnz);
582 OPEN_READER(re, &s->gb);
587 UPDATE_CACHE(re, &s->gb);
588 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
591 run = ((unsigned) code) >> 4;
592 UPDATE_CACHE(re, &s->gb);
593 val = SHOW_UBITS(re, &s->gb, 1);
594 LAST_SKIP_BITS(re, &s->gb, 1);
596 j = s->scantable.permutated[i];
598 block[j] = ((quant_matrix[j]^val) - val) << Al;
602 CLOSE_READER(re, &s->gb);
606 run = ((unsigned) code) >> 4;
613 UPDATE_CACHE(re, &s->gb);
614 run += SHOW_UBITS(re, &s->gb, val);
615 LAST_SKIP_BITS(re, &s->gb, val);
627 for (; i <= last; i++) {
628 j = s->scantable.permutated[i];
632 CLOSE_READER(re, &s->gb);
639 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor,
643 uint16_t (*buffer)[4];
644 int left[3], top[3], topleft[3];
645 const int linesize = s->linesize[0];
646 const int mask = (1 << s->bits) - 1;
648 av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
649 (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
650 buffer = s->ljpeg_buffer;
652 for (i = 0; i < 3; i++)
653 buffer[0][i] = 1 << (s->bits + point_transform - 1);
655 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
656 const int modified_predictor = mb_y ? predictor : 1;
657 uint8_t *ptr = s->picture_ptr->data[0] + (linesize * mb_y);
659 if (s->interlaced && s->bottom_field)
660 ptr += linesize >> 1;
662 for (i = 0; i < 3; i++)
663 top[i] = left[i] = topleft[i] = buffer[0][i];
665 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
666 if (s->restart_interval && !s->restart_count)
667 s->restart_count = s->restart_interval;
669 for (i = 0; i < 3; i++) {
673 top[i] = buffer[mb_x][i];
675 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
677 left[i] = buffer[mb_x][i] =
678 mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
681 if (s->restart_interval && !--s->restart_count) {
682 align_get_bits(&s->gb);
683 skip_bits(&s->gb, 16); /* skip RSTn */
688 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
689 ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
690 ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
691 ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
693 } else if (s->pegasus_rct) {
694 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
695 ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
696 ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
697 ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
700 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
701 ptr[4 * mb_x + 0] = buffer[mb_x][2];
702 ptr[4 * mb_x + 1] = buffer[mb_x][1];
703 ptr[4 * mb_x + 2] = buffer[mb_x][0];
710 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
714 const int nb_components = 3;
716 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
717 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
718 if (s->restart_interval && !s->restart_count)
719 s->restart_count = s->restart_interval;
721 if (mb_x == 0 || mb_y == 0 || s->interlaced) {
722 for (i = 0; i < nb_components; i++) {
724 int n, h, v, x, y, c, j, linesize;
726 c = s->comp_index[i];
731 linesize = s->linesize[c];
733 for (j = 0; j < n; j++) {
735 // FIXME optimize this crap
736 ptr = s->picture_ptr->data[c] +
737 (linesize * (v * mb_y + y)) +
739 if (y == 0 && mb_y == 0) {
740 if (x == 0 && mb_x == 0)
741 pred = 128 << point_transform;
745 if (x == 0 && mb_x == 0)
746 pred = ptr[-linesize];
748 PREDICT(pred, ptr[-linesize - 1],
749 ptr[-linesize], ptr[-1], predictor);
752 if (s->interlaced && s->bottom_field)
753 ptr += linesize >> 1;
754 *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
763 for (i = 0; i < nb_components; i++) {
765 int n, h, v, x, y, c, j, linesize;
767 c = s->comp_index[i];
772 linesize = s->linesize[c];
774 for (j = 0; j < n; j++) {
777 // FIXME optimize this crap
778 ptr = s->picture_ptr->data[c] +
779 (linesize * (v * mb_y + y)) +
781 PREDICT(pred, ptr[-linesize - 1],
782 ptr[-linesize], ptr[-1], predictor);
783 *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
791 if (s->restart_interval && !--s->restart_count) {
792 align_get_bits(&s->gb);
793 skip_bits(&s->gb, 16); /* skip RSTn */
800 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
801 int Al, const uint8_t *mb_bitmask,
802 const AVFrame *reference)
805 uint8_t *data[MAX_COMPONENTS];
806 const uint8_t *reference_data[MAX_COMPONENTS];
807 int linesize[MAX_COMPONENTS];
808 GetBitContext mb_bitmask_gb;
811 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
813 if (s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
814 av_log(s->avctx, AV_LOG_ERROR,
815 "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
819 for (i = 0; i < nb_components; i++) {
820 int c = s->comp_index[i];
821 data[c] = s->picture_ptr->data[c];
822 reference_data[c] = reference ? reference->data[c] : NULL;
823 linesize[c] = s->linesize[c];
824 s->coefs_finished[c] |= 1;
826 // picture should be flipped upside-down for this codec
827 int offset = (linesize[c] * (s->v_scount[i] *
828 (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
830 reference_data[c] += offset;
835 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
836 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
837 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
839 if (s->restart_interval && !s->restart_count)
840 s->restart_count = s->restart_interval;
842 if (get_bits_left(&s->gb) < 0) {
843 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
844 -get_bits_left(&s->gb));
845 return AVERROR_INVALIDDATA;
847 for (i = 0; i < nb_components; i++) {
849 int n, h, v, x, y, c, j;
852 c = s->comp_index[i];
857 for (j = 0; j < n; j++) {
858 block_offset = ((linesize[c] * (v * mb_y + y) * 8) +
861 if (s->interlaced && s->bottom_field)
862 block_offset += linesize[c] >> 1;
863 ptr = data[c] + block_offset;
864 if (!s->progressive) {
866 copy_block8(ptr, reference_data[c] + block_offset,
867 linesize[c], linesize[c], 8);
869 s->dsp.clear_block(s->block);
870 if (decode_block(s, s->block, i,
871 s->dc_index[i], s->ac_index[i],
872 s->quant_matrixes[s->quant_index[c]]) < 0) {
873 av_log(s->avctx, AV_LOG_ERROR,
874 "error y=%d x=%d\n", mb_y, mb_x);
875 return AVERROR_INVALIDDATA;
877 s->dsp.idct_put(ptr, linesize[c], s->block);
880 int block_idx = s->block_stride[c] * (v * mb_y + y) +
882 DCTELEM *block = s->blocks[c][block_idx];
884 block[0] += get_bits1(&s->gb) *
885 s->quant_matrixes[s->quant_index[c]][0] << Al;
886 else if (decode_dc_progressive(s, block, i, s->dc_index[i],
887 s->quant_matrixes[s->quant_index[c]],
889 av_log(s->avctx, AV_LOG_ERROR,
890 "error y=%d x=%d\n", mb_y, mb_x);
891 return AVERROR_INVALIDDATA;
894 av_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x);
895 av_dlog(s->avctx, "%d %d %d %d %d %d %d %d \n",
896 mb_x, mb_y, x, y, c, s->bottom_field,
897 (v * mb_y + y) * 8, (h * mb_x + x) * 8);
905 if (s->restart_interval) {
907 i = 8 + ((-get_bits_count(&s->gb)) & 7);
909 if (show_bits(&s->gb, i) == (1 << i) - 1) {
910 int pos = get_bits_count(&s->gb);
911 align_get_bits(&s->gb);
912 while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
913 skip_bits(&s->gb, 8);
914 if ((get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
915 for (i = 0; i < nb_components; i++) /* reset dc */
916 s->last_dc[i] = 1024;
918 skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
926 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
927 int se, int Ah, int Al,
928 const uint8_t *mb_bitmask,
929 const AVFrame *reference)
933 int c = s->comp_index[0];
934 uint8_t *data = s->picture_ptr->data[c];
935 const uint8_t *reference_data = reference ? reference->data[c] : NULL;
936 int linesize = s->linesize[c];
938 int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
939 GetBitContext mb_bitmask_gb;
942 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
945 s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
946 last_scan = !~s->coefs_finished[c];
949 if (s->interlaced && s->bottom_field) {
950 int offset = linesize >> 1;
952 reference_data += offset;
955 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
956 int block_offset = mb_y * linesize * 8;
957 uint8_t *ptr = data + block_offset;
958 int block_idx = mb_y * s->block_stride[c];
959 DCTELEM (*block)[64] = &s->blocks[c][block_idx];
960 uint8_t *last_nnz = &s->last_nnz[c][block_idx];
961 for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
962 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
967 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
968 quant_matrix, ss, se, Al, &EOBRUN);
970 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
971 quant_matrix, ss, se, Al, &EOBRUN);
973 av_log(s->avctx, AV_LOG_ERROR,
974 "error y=%d x=%d\n", mb_y, mb_x);
975 return AVERROR_INVALIDDATA;
981 copy_block8(ptr, reference_data + block_offset,
982 linesize, linesize, 8);
984 s->dsp.idct_put(ptr, linesize, *block);
993 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
994 const AVFrame *reference)
996 int len, nb_components, i, h, v, predictor, point_transform;
998 const int block_size = s->lossless ? 1 : 8;
1001 /* XXX: verify len field validity */
1002 len = get_bits(&s->gb, 16);
1003 nb_components = get_bits(&s->gb, 8);
1004 if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
1005 av_log(s->avctx, AV_LOG_ERROR,
1006 "decode_sos: nb_components (%d) unsupported\n", nb_components);
1007 return AVERROR_PATCHWELCOME;
1009 if (len != 6 + 2 * nb_components) {
1010 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1011 return AVERROR_INVALIDDATA;
1013 for (i = 0; i < nb_components; i++) {
1014 id = get_bits(&s->gb, 8) - 1;
1015 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1016 /* find component index */
1017 for (index = 0; index < s->nb_components; index++)
1018 if (id == s->component_id[index])
1020 if (index == s->nb_components) {
1021 av_log(s->avctx, AV_LOG_ERROR,
1022 "decode_sos: index(%d) out of components\n", index);
1023 return AVERROR_INVALIDDATA;
1025 /* Metasoft MJPEG codec has Cb and Cr swapped */
1026 if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1027 && nb_components == 3 && s->nb_components == 3 && i)
1030 s->comp_index[i] = index;
1032 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1033 s->h_scount[i] = s->h_count[index];
1034 s->v_scount[i] = s->v_count[index];
1036 s->dc_index[i] = get_bits(&s->gb, 4);
1037 s->ac_index[i] = get_bits(&s->gb, 4);
1039 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1040 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1042 if (!s->vlcs[0][s->dc_index[i]].table ||
1043 !s->vlcs[1][s->ac_index[i]].table)
1047 predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1048 ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1049 prev_shift = get_bits(&s->gb, 4); /* Ah */
1050 point_transform = get_bits(&s->gb, 4); /* Al */
1052 if (nb_components > 1) {
1053 /* interleaved stream */
1054 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1055 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1056 } else if (!s->ls) { /* skip this for JPEG-LS */
1057 h = s->h_max / s->h_scount[0];
1058 v = s->v_max / s->v_scount[0];
1059 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1060 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1061 s->nb_blocks[0] = 1;
1066 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1067 av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n",
1068 s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1069 predictor, point_transform, ilv, s->bits,
1070 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
1073 /* mjpeg-b can have padding bytes between sos and image data, skip them */
1074 for (i = s->mjpb_skiptosod; i > 0; i--)
1075 skip_bits(&s->gb, 8);
1078 for (i = 0; i < nb_components; i++)
1079 s->last_dc[i] = 1024;
1082 if (CONFIG_JPEGLS_DECODER && s->ls) {
1084 // reset_ls_coding_parameters(s, 0);
1086 if ((ret = ff_jpegls_decode_picture(s, predictor,
1087 point_transform, ilv)) < 0)
1091 if ((ret = ljpeg_decode_rgb_scan(s, predictor,
1092 point_transform)) < 0)
1095 if ((ret = ljpeg_decode_yuv_scan(s, predictor,
1096 point_transform)) < 0)
1101 if (s->progressive && predictor) {
1102 if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor,
1109 if ((ret = mjpeg_decode_scan(s, nb_components,
1110 prev_shift, point_transform,
1111 mb_bitmask, reference)) < 0)
1116 if (s->interlaced &&
1117 get_bits_left(&s->gb) > 32 &&
1118 show_bits(&s->gb, 8) == 0xFF) {
1119 GetBitContext bak = s->gb;
1120 align_get_bits(&bak);
1121 if (show_bits(&bak, 16) == 0xFFD1) {
1122 av_dlog(s->avctx, "AVRn interlaced picture marker found\n");
1124 skip_bits(&s->gb, 16);
1125 s->bottom_field ^= 1;
1134 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1135 return AVERROR_INVALIDDATA;
1138 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1140 if (get_bits(&s->gb, 16) != 4)
1141 return AVERROR_INVALIDDATA;
1142 s->restart_interval = get_bits(&s->gb, 16);
1143 s->restart_count = 0;
1144 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
1145 s->restart_interval);
1150 static int mjpeg_decode_app(MJpegDecodeContext *s)
1154 len = get_bits(&s->gb, 16);
1156 return AVERROR_INVALIDDATA;
1157 if (8 * len > get_bits_left(&s->gb))
1158 return AVERROR_INVALIDDATA;
1160 id = get_bits_long(&s->gb, 32);
1161 id = av_be2ne32(id);
1164 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1165 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1167 /* Buggy AVID, it puts EOI only at every 10th frame. */
1168 /* Also, this fourcc is used by non-avid files too, it holds some
1169 information, but it's always present in AVID-created files. */
1170 if (id == AV_RL32("AVI1")) {
1176 4bytes field_size_less_padding
1179 i = get_bits(&s->gb, 8);
1181 s->bottom_field = 1;
1183 s->bottom_field = 0;
1185 skip_bits(&s->gb, 8);
1186 skip_bits(&s->gb, 32);
1187 skip_bits(&s->gb, 32);
1195 if (id == AV_RL32("JFIF")) {
1196 int t_w, t_h, v1, v2;
1197 skip_bits(&s->gb, 8); /* the trailing zero-byte */
1198 v1 = get_bits(&s->gb, 8);
1199 v2 = get_bits(&s->gb, 8);
1200 skip_bits(&s->gb, 8);
1202 s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
1203 s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
1205 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1206 av_log(s->avctx, AV_LOG_INFO,
1207 "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1209 s->avctx->sample_aspect_ratio.num,
1210 s->avctx->sample_aspect_ratio.den);
1212 t_w = get_bits(&s->gb, 8);
1213 t_h = get_bits(&s->gb, 8);
1215 /* skip thumbnail */
1216 if (len -10 - (t_w * t_h * 3) > 0)
1217 len -= t_w * t_h * 3;
1223 if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
1224 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1225 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1226 skip_bits(&s->gb, 16); /* version */
1227 skip_bits(&s->gb, 16); /* flags0 */
1228 skip_bits(&s->gb, 16); /* flags1 */
1229 skip_bits(&s->gb, 8); /* transform */
1234 if (id == AV_RL32("LJIF")) {
1235 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1236 av_log(s->avctx, AV_LOG_INFO,
1237 "Pegasus lossless jpeg header found\n");
1238 skip_bits(&s->gb, 16); /* version ? */
1239 skip_bits(&s->gb, 16); /* unknwon always 0? */
1240 skip_bits(&s->gb, 16); /* unknwon always 0? */
1241 skip_bits(&s->gb, 16); /* unknwon always 0? */
1242 switch (get_bits(&s->gb, 8)) {
1252 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1259 if ((s->start_code == APP1) && (len > (0x28 - 8))) {
1260 id = get_bits_long(&s->gb, 32);
1261 id = av_be2ne32(id);
1264 if (id == AV_RL32("mjpg")) {
1266 skip_bits(&s->gb, 32); /* field size */
1267 skip_bits(&s->gb, 32); /* pad field size */
1268 skip_bits(&s->gb, 32); /* next off */
1269 skip_bits(&s->gb, 32); /* quant off */
1270 skip_bits(&s->gb, 32); /* huff off */
1271 skip_bits(&s->gb, 32); /* image off */
1272 skip_bits(&s->gb, 32); /* scan off */
1273 skip_bits(&s->gb, 32); /* data off */
1275 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1276 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1281 /* slow but needed for extreme adobe jpegs */
1283 av_log(s->avctx, AV_LOG_ERROR,
1284 "mjpeg: error, decode_app parser read over the end\n");
1286 skip_bits(&s->gb, 8);
1291 static int mjpeg_decode_com(MJpegDecodeContext *s)
1293 int len = get_bits(&s->gb, 16);
1294 if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
1295 char *cbuf = av_malloc(len - 1);
1298 for (i = 0; i < len - 2; i++)
1299 cbuf[i] = get_bits(&s->gb, 8);
1300 if (i > 0 && cbuf[i - 1] == '\n')
1305 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1306 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1308 /* buggy avid, it puts EOI only at every 10th frame */
1309 if (!strcmp(cbuf, "AVID")) {
1311 } else if (!strcmp(cbuf, "CS=ITU601"))
1313 else if ((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
1314 (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
1324 /* return the 8 bit start code value and update the search
1325 state. Return -1 if no start code found */
1326 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1328 const uint8_t *buf_ptr;
1335 buf_ptr = *pbuf_ptr;
1336 while (buf_ptr < buf_end) {
1339 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1349 av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1350 *pbuf_ptr = buf_ptr;
1354 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1355 const uint8_t **buf_ptr, const uint8_t *buf_end,
1356 const uint8_t **unescaped_buf_ptr,
1357 int *unescaped_buf_size)
1360 start_code = find_marker(buf_ptr, buf_end);
1362 av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
1364 return AVERROR(ENOMEM);
1366 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1367 if (start_code == SOS && !s->ls) {
1368 const uint8_t *src = *buf_ptr;
1369 uint8_t *dst = s->buffer;
1371 while (src < buf_end) {
1372 uint8_t x = *(src++);
1375 if (s->avctx->codec_id != AV_CODEC_ID_THP) {
1377 while (src < buf_end && x == 0xff)
1380 if (x >= 0xd0 && x <= 0xd7)
1387 *unescaped_buf_ptr = s->buffer;
1388 *unescaped_buf_size = dst - s->buffer;
1390 av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1391 (buf_end - *buf_ptr) - (dst - s->buffer));
1392 } else if (start_code == SOS && s->ls) {
1393 const uint8_t *src = *buf_ptr;
1394 uint8_t *dst = s->buffer;
1402 while (src + t < buf_end) {
1403 uint8_t x = src[t++];
1405 while ((src + t < buf_end) && x == 0xff)
1414 init_put_bits(&pb, dst, t);
1416 /* unescape bitstream */
1418 uint8_t x = src[b++];
1419 put_bits(&pb, 8, x);
1422 put_bits(&pb, 7, x);
1426 flush_put_bits(&pb);
1428 *unescaped_buf_ptr = dst;
1429 *unescaped_buf_size = (bit_count + 7) >> 3;
1431 *unescaped_buf_ptr = *buf_ptr;
1432 *unescaped_buf_size = buf_end - *buf_ptr;
1438 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
1441 const uint8_t *buf = avpkt->data;
1442 int buf_size = avpkt->size;
1443 MJpegDecodeContext *s = avctx->priv_data;
1444 const uint8_t *buf_end, *buf_ptr;
1445 const uint8_t *unescaped_buf_ptr;
1446 int unescaped_buf_size;
1449 AVFrame *picture = data;
1451 s->got_picture = 0; // picture from previous image can not be reused
1453 buf_end = buf + buf_size;
1454 while (buf_ptr < buf_end) {
1455 /* find start next marker */
1456 start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1458 &unescaped_buf_size);
1460 if (start_code < 0) {
1462 } else if (unescaped_buf_size > (1U<<29)) {
1463 av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
1464 start_code, unescaped_buf_size, buf_size);
1465 return AVERROR_INVALIDDATA;
1467 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
1468 start_code, buf_end - buf_ptr);
1470 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
1472 s->start_code = start_code;
1473 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1474 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1476 /* process markers */
1477 if (start_code >= 0xd0 && start_code <= 0xd7)
1478 av_log(avctx, AV_LOG_DEBUG,
1479 "restart marker: %d\n", start_code & 0x0f);
1481 else if (start_code >= APP0 && start_code <= APP15)
1482 mjpeg_decode_app(s);
1484 else if (start_code == COM)
1485 mjpeg_decode_com(s);
1487 switch (start_code) {
1489 s->restart_interval = 0;
1490 s->restart_count = 0;
1491 /* nothing to do on SOI */
1494 ff_mjpeg_decode_dqt(s);
1497 if ((ret = ff_mjpeg_decode_dht(s)) < 0) {
1498 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1507 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1514 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1521 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1528 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1532 if (!CONFIG_JPEGLS_DECODER ||
1533 (ret = ff_jpegls_decode_lse(s)) < 0)
1538 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1541 if (!s->got_picture) {
1542 av_log(avctx, AV_LOG_WARNING,
1543 "Found EOI before any SOF, ignoring\n");
1546 if (s->interlaced) {
1547 s->bottom_field ^= 1;
1548 /* if not bottom field, do not output image yet */
1549 if (s->bottom_field == !s->interlace_polarity)
1552 *picture = *s->picture_ptr;
1553 *data_size = sizeof(AVFrame);
1556 picture->quality = FFMAX3(s->qscale[0],
1559 picture->qstride = 0;
1560 picture->qscale_table = s->qscale_table;
1561 memset(picture->qscale_table, picture->quality,
1562 (s->width + 15) / 16);
1563 if (avctx->debug & FF_DEBUG_QP)
1564 av_log(avctx, AV_LOG_DEBUG,
1565 "QP: %d\n", picture->quality);
1566 picture->quality *= FF_QP2LAMBDA;
1571 if (!s->got_picture) {
1572 av_log(avctx, AV_LOG_WARNING,
1573 "Can not process SOS before SOF, skipping\n");
1576 if ((ret = ff_mjpeg_decode_sos(s, NULL, NULL)) < 0 &&
1577 (avctx->err_recognition & AV_EF_EXPLODE))
1579 /* buggy avid puts EOI every 10-20th frame */
1580 /* if restart period is over process EOI */
1581 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1585 mjpeg_decode_dri(s);
1597 av_log(avctx, AV_LOG_ERROR,
1598 "mjpeg: unsupported coding type (%x)\n", start_code);
1603 /* eof process start code */
1604 buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
1605 av_log(avctx, AV_LOG_DEBUG,
1606 "marker parser used %d bytes (%d bits)\n",
1607 (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
1610 if (s->got_picture) {
1611 av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1614 av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1615 return AVERROR_INVALIDDATA;
1617 av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n",
1619 // return buf_end - buf_ptr;
1620 return buf_ptr - buf;
1623 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1625 MJpegDecodeContext *s = avctx->priv_data;
1628 if (s->picture_ptr && s->picture_ptr->data[0])
1629 avctx->release_buffer(avctx, s->picture_ptr);
1632 av_free(s->qscale_table);
1633 av_freep(&s->ljpeg_buffer);
1634 s->ljpeg_buffer_size = 0;
1636 for (i = 0; i < 3; i++) {
1637 for (j = 0; j < 4; j++)
1638 ff_free_vlc(&s->vlcs[i][j]);
1640 for (i = 0; i < MAX_COMPONENTS; i++) {
1641 av_freep(&s->blocks[i]);
1642 av_freep(&s->last_nnz[i]);
1647 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1648 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1649 static const AVOption options[] = {
1650 { "extern_huff", "Use external huffman table.",
1651 OFFSET(extern_huff), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
1655 static const AVClass mjpegdec_class = {
1656 .class_name = "MJPEG decoder",
1657 .item_name = av_default_item_name,
1659 .version = LIBAVUTIL_VERSION_INT,
1662 AVCodec ff_mjpeg_decoder = {
1664 .type = AVMEDIA_TYPE_VIDEO,
1665 .id = AV_CODEC_ID_MJPEG,
1666 .priv_data_size = sizeof(MJpegDecodeContext),
1667 .init = ff_mjpeg_decode_init,
1668 .close = ff_mjpeg_decode_end,
1669 .decode = ff_mjpeg_decode_frame,
1670 .capabilities = CODEC_CAP_DR1,
1671 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1672 .priv_class = &mjpegdec_class,
1675 AVCodec ff_thp_decoder = {
1677 .type = AVMEDIA_TYPE_VIDEO,
1678 .id = AV_CODEC_ID_THP,
1679 .priv_data_size = sizeof(MJpegDecodeContext),
1680 .init = ff_mjpeg_decode_init,
1681 .close = ff_mjpeg_decode_end,
1682 .decode = ff_mjpeg_decode_frame,
1683 .capabilities = CODEC_CAP_DR1,
1684 .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),