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
35 #include "libavutil/imgutils.h"
36 #include "libavutil/opt.h"
43 #include "jpeglsdec.h"
47 static int build_vlc(VLC *vlc, const uint8_t *bits_table,
48 const uint8_t *val_table, int nb_codes,
49 int use_static, int is_ac)
51 uint8_t huff_size[256] = { 0 };
52 uint16_t huff_code[256];
53 uint16_t huff_sym[256];
56 assert(nb_codes <= 256);
58 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
60 for (i = 0; i < 256; i++)
61 huff_sym[i] = i + 16 * is_ac;
64 huff_sym[0] = 16 * 256;
66 return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
67 huff_code, 2, 2, huff_sym, 2, 2, use_static);
70 static void build_basic_mjpeg_vlc(MJpegDecodeContext *s)
72 build_vlc(&s->vlcs[0][0], avpriv_mjpeg_bits_dc_luminance,
73 avpriv_mjpeg_val_dc, 12, 0, 0);
74 build_vlc(&s->vlcs[0][1], avpriv_mjpeg_bits_dc_chrominance,
75 avpriv_mjpeg_val_dc, 12, 0, 0);
76 build_vlc(&s->vlcs[1][0], avpriv_mjpeg_bits_ac_luminance,
77 avpriv_mjpeg_val_ac_luminance, 251, 0, 1);
78 build_vlc(&s->vlcs[1][1], avpriv_mjpeg_bits_ac_chrominance,
79 avpriv_mjpeg_val_ac_chrominance, 251, 0, 1);
80 build_vlc(&s->vlcs[2][0], avpriv_mjpeg_bits_ac_luminance,
81 avpriv_mjpeg_val_ac_luminance, 251, 0, 0);
82 build_vlc(&s->vlcs[2][1], avpriv_mjpeg_bits_ac_chrominance,
83 avpriv_mjpeg_val_ac_chrominance, 251, 0, 0);
86 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
88 MJpegDecodeContext *s = avctx->priv_data;
90 if (!s->picture_ptr) {
91 s->picture = av_frame_alloc();
93 return AVERROR(ENOMEM);
94 s->picture_ptr = s->picture;
98 ff_blockdsp_init(&s->bdsp, avctx);
99 ff_hpeldsp_init(&s->hdsp, avctx->flags);
100 ff_idctdsp_init(&s->idsp, avctx);
101 ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
106 s->first_picture = 1;
107 s->org_height = avctx->coded_height;
108 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
109 avctx->colorspace = AVCOL_SPC_BT470BG;
111 build_basic_mjpeg_vlc(s);
113 if (s->extern_huff) {
115 av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
116 init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
117 if ((ret = ff_mjpeg_decode_dht(s))) {
118 av_log(avctx, AV_LOG_ERROR,
119 "mjpeg: error using external huffman table\n");
123 if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
124 s->interlace_polarity = 1; /* bottom field first */
125 av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
127 if (avctx->codec->id == AV_CODEC_ID_AMV)
134 /* quantize tables */
135 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
137 int len, index, i, j;
139 len = get_bits(&s->gb, 16) - 2;
142 /* only 8 bit precision handled */
143 if (get_bits(&s->gb, 4) != 0) {
144 av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
147 index = get_bits(&s->gb, 4);
150 av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
151 /* read quant table */
152 for (i = 0; i < 64; i++) {
153 j = s->scantable.permutated[i];
154 s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
157 // XXX FIXME finetune, and perhaps add dc too
158 s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
159 s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
160 av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
161 index, s->qscale[index]);
167 /* decode huffman tables and build VLC decoders */
168 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
170 int len, index, i, class, n, v, code_max;
171 uint8_t bits_table[17];
172 uint8_t val_table[256];
175 len = get_bits(&s->gb, 16) - 2;
179 return AVERROR_INVALIDDATA;
180 class = get_bits(&s->gb, 4);
182 return AVERROR_INVALIDDATA;
183 index = get_bits(&s->gb, 4);
185 return AVERROR_INVALIDDATA;
187 for (i = 1; i <= 16; i++) {
188 bits_table[i] = get_bits(&s->gb, 8);
192 if (len < n || n > 256)
193 return AVERROR_INVALIDDATA;
196 for (i = 0; i < n; i++) {
197 v = get_bits(&s->gb, 8);
204 /* build VLC and flush previous vlc if present */
205 ff_free_vlc(&s->vlcs[class][index]);
206 av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
207 class, index, code_max + 1);
208 if ((ret = build_vlc(&s->vlcs[class][index], bits_table, val_table,
209 code_max + 1, 0, class > 0)) < 0)
213 ff_free_vlc(&s->vlcs[2][index]);
214 if ((ret = build_vlc(&s->vlcs[2][index], bits_table, val_table,
215 code_max + 1, 0, 0)) < 0)
222 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
224 int h_count[MAX_COMPONENTS] = { 0 };
225 int v_count[MAX_COMPONENTS] = { 0 };
226 int len, nb_components, i, width, height, bits, pix_fmt_id, ret;
228 /* XXX: verify len field validity */
229 len = get_bits(&s->gb, 16);
230 bits = get_bits(&s->gb, 8);
234 if (bits == 9 && !s->pegasus_rct)
235 s->rct = 1; // FIXME ugly
237 if (bits != 8 && !s->lossless) {
238 av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
242 height = get_bits(&s->gb, 16);
243 width = get_bits(&s->gb, 16);
245 // HACK for odd_height.mov
246 if (s->interlaced && s->width == width && s->height == height + 1)
249 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
250 if (av_image_check_size(width, height, 0, s->avctx))
251 return AVERROR_INVALIDDATA;
253 nb_components = get_bits(&s->gb, 8);
254 if (nb_components <= 0 ||
255 nb_components > MAX_COMPONENTS)
257 if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
258 if (nb_components != s->nb_components) {
259 av_log(s->avctx, AV_LOG_ERROR,
260 "nb_components changing in interlaced picture\n");
261 return AVERROR_INVALIDDATA;
264 if (s->ls && !(bits <= 8 || nb_components == 1)) {
265 avpriv_report_missing_feature(s->avctx,
266 "JPEG-LS that is not <= 8 "
267 "bits/component or 16-bit gray");
268 return AVERROR_PATCHWELCOME;
270 s->nb_components = nb_components;
273 for (i = 0; i < nb_components; i++) {
275 s->component_id[i] = get_bits(&s->gb, 8) - 1;
276 h_count[i] = get_bits(&s->gb, 4);
277 v_count[i] = get_bits(&s->gb, 4);
278 /* compute hmax and vmax (only used in interleaved case) */
279 if (h_count[i] > s->h_max)
280 s->h_max = h_count[i];
281 if (v_count[i] > s->v_max)
282 s->v_max = v_count[i];
283 s->quant_index[i] = get_bits(&s->gb, 8);
284 if (s->quant_index[i] >= 4)
285 return AVERROR_INVALIDDATA;
286 if (!h_count[i] || !v_count[i]) {
287 av_log(s->avctx, AV_LOG_ERROR,
288 "Invalid sampling factor in component %d %d:%d\n",
289 i, h_count[i], v_count[i]);
290 return AVERROR_INVALIDDATA;
293 av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
294 i, h_count[i], v_count[i],
295 s->component_id[i], s->quant_index[i]);
298 if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
299 avpriv_report_missing_feature(s->avctx, "Subsampling in JPEG-LS");
300 return AVERROR_PATCHWELCOME;
303 if (s->v_max == 1 && s->h_max == 1 && s->lossless == 1)
306 /* if different size, realloc/alloc picture */
307 if (width != s->width || height != s->height || bits != s->bits ||
308 memcmp(s->h_count, h_count, sizeof(h_count)) ||
309 memcmp(s->v_count, v_count, sizeof(v_count))) {
313 memcpy(s->h_count, h_count, sizeof(h_count));
314 memcpy(s->v_count, v_count, sizeof(v_count));
317 /* test interlaced mode */
318 if (s->first_picture &&
319 s->org_height != 0 &&
320 s->height < ((s->org_height * 3) / 4)) {
322 s->bottom_field = s->interlace_polarity;
323 s->picture_ptr->interlaced_frame = 1;
324 s->picture_ptr->top_field_first = !s->interlace_polarity;
328 ret = ff_set_dimensions(s->avctx, width, height);
332 s->first_picture = 0;
335 if (!(s->interlaced && (s->bottom_field == !s->interlace_polarity))) {
336 /* XXX: not complete test ! */
337 pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
338 (s->h_count[1] << 20) | (s->v_count[1] << 16) |
339 (s->h_count[2] << 12) | (s->v_count[2] << 8) |
340 (s->h_count[3] << 4) | s->v_count[3];
341 av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
342 /* NOTE we do not allocate pictures large enough for the possible
343 * padding of h/v_count being 4 */
344 if (!(pix_fmt_id & 0xD0D0D0D0))
345 pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
346 if (!(pix_fmt_id & 0x0D0D0D0D))
347 pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
349 switch (pix_fmt_id) {
352 s->avctx->pix_fmt = AV_PIX_FMT_BGRA;
354 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
355 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
357 assert(s->nb_components == 3);
360 s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
363 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV440P : AV_PIX_FMT_YUVJ440P;
364 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
367 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
368 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
371 s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUVJ420P;
372 s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
375 av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
376 return AVERROR_PATCHWELCOME;
379 if (s->nb_components > 1)
380 s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
381 else if (s->bits <= 8)
382 s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
384 s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
387 s->pix_desc = av_pix_fmt_desc_get(s->avctx->pix_fmt);
389 av_log(s->avctx, AV_LOG_ERROR, "Could not get a pixel format descriptor.\n");
393 av_frame_unref(s->picture_ptr);
394 if (ff_get_buffer(s->avctx, s->picture_ptr, AV_GET_BUFFER_FLAG_REF) < 0) {
395 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
398 s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
399 s->picture_ptr->key_frame = 1;
402 for (i = 0; i < 3; i++)
403 s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
405 av_dlog(s->avctx, "%d %d %d %d %d %d\n",
406 s->width, s->height, s->linesize[0], s->linesize[1],
407 s->interlaced, s->avctx->height);
409 if (len != (8 + (3 * nb_components)))
410 av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
413 /* totally blank picture as progressive JPEG will only add details to it */
414 if (s->progressive) {
415 int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
416 int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
417 for (i = 0; i < s->nb_components; i++) {
418 int size = bw * bh * s->h_count[i] * s->v_count[i];
419 av_freep(&s->blocks[i]);
420 av_freep(&s->last_nnz[i]);
421 s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
422 s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
423 s->block_stride[i] = bw * s->h_count[i];
425 memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
430 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
433 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
435 av_log(s->avctx, AV_LOG_WARNING,
436 "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
437 0, dc_index, &s->vlcs[0][dc_index]);
442 return get_xbits(&s->gb, code);
447 /* decode block and dequantize */
448 static int decode_block(MJpegDecodeContext *s, int16_t *block, int component,
449 int dc_index, int ac_index, int16_t *quant_matrix)
451 int code, i, j, level, val;
454 val = mjpeg_decode_dc(s, dc_index);
456 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
457 return AVERROR_INVALIDDATA;
459 val = val * quant_matrix[0] + s->last_dc[component];
460 s->last_dc[component] = val;
464 {OPEN_READER(re, &s->gb);
466 UPDATE_CACHE(re, &s->gb);
467 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
469 i += ((unsigned)code) >> 4;
472 if (code > MIN_CACHE_BITS - 16)
473 UPDATE_CACHE(re, &s->gb);
476 int cache = GET_CACHE(re, &s->gb);
477 int sign = (~cache) >> 31;
478 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
481 LAST_SKIP_BITS(re, &s->gb, code);
484 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
485 return AVERROR_INVALIDDATA;
487 j = s->scantable.permutated[i];
488 block[j] = level * quant_matrix[j];
491 CLOSE_READER(re, &s->gb);}
496 static int decode_dc_progressive(MJpegDecodeContext *s, int16_t *block,
497 int component, int dc_index,
498 int16_t *quant_matrix, int Al)
501 s->bdsp.clear_block(block);
502 val = mjpeg_decode_dc(s, dc_index);
504 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
505 return AVERROR_INVALIDDATA;
507 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
508 s->last_dc[component] = val;
513 /* decode block and dequantize - progressive JPEG version */
514 static int decode_block_progressive(MJpegDecodeContext *s, int16_t *block,
515 uint8_t *last_nnz, int ac_index,
516 int16_t *quant_matrix,
517 int ss, int se, int Al, int *EOBRUN)
519 int code, i, j, level, val, run;
527 OPEN_READER(re, &s->gb);
528 for (i = ss; ; i++) {
529 UPDATE_CACHE(re, &s->gb);
530 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
532 run = ((unsigned) code) >> 4;
536 if (code > MIN_CACHE_BITS - 16)
537 UPDATE_CACHE(re, &s->gb);
540 int cache = GET_CACHE(re, &s->gb);
541 int sign = (~cache) >> 31;
542 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
545 LAST_SKIP_BITS(re, &s->gb, code);
549 j = s->scantable.permutated[se];
550 block[j] = level * quant_matrix[j] << Al;
553 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
554 return AVERROR_INVALIDDATA;
556 j = s->scantable.permutated[i];
557 block[j] = level * quant_matrix[j] << Al;
559 if (run == 0xF) {// ZRL - skip 15 coefficients
562 av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
563 return AVERROR_INVALIDDATA;
568 UPDATE_CACHE(re, &s->gb);
569 val += NEG_USR32(GET_CACHE(re, &s->gb), run);
570 LAST_SKIP_BITS(re, &s->gb, run);
577 CLOSE_READER(re, &s->gb);
586 #define REFINE_BIT(j) { \
587 UPDATE_CACHE(re, &s->gb); \
588 sign = block[j] >> 15; \
589 block[j] += SHOW_UBITS(re, &s->gb, 1) * \
590 ((quant_matrix[j] ^ sign) - sign) << Al; \
591 LAST_SKIP_BITS(re, &s->gb, 1); \
599 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
604 j = s->scantable.permutated[i]; \
607 else if (run-- == 0) \
611 /* decode block and dequantize - progressive JPEG refinement pass */
612 static int decode_block_refinement(MJpegDecodeContext *s, int16_t *block,
614 int ac_index, int16_t *quant_matrix,
615 int ss, int se, int Al, int *EOBRUN)
617 int code, i = ss, j, sign, val, run;
618 int last = FFMIN(se, *last_nnz);
620 OPEN_READER(re, &s->gb);
625 UPDATE_CACHE(re, &s->gb);
626 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
629 run = ((unsigned) code) >> 4;
630 UPDATE_CACHE(re, &s->gb);
631 val = SHOW_UBITS(re, &s->gb, 1);
632 LAST_SKIP_BITS(re, &s->gb, 1);
634 j = s->scantable.permutated[i];
636 block[j] = ((quant_matrix[j]^val) - val) << Al;
640 CLOSE_READER(re, &s->gb);
644 run = ((unsigned) code) >> 4;
651 UPDATE_CACHE(re, &s->gb);
652 run += SHOW_UBITS(re, &s->gb, val);
653 LAST_SKIP_BITS(re, &s->gb, val);
665 for (; i <= last; i++) {
666 j = s->scantable.permutated[i];
670 CLOSE_READER(re, &s->gb);
677 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor,
681 uint16_t (*buffer)[4];
682 int left[3], top[3], topleft[3];
683 const int linesize = s->linesize[0];
684 const int mask = (1 << s->bits) - 1;
686 av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
687 (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
688 buffer = s->ljpeg_buffer;
690 for (i = 0; i < 3; i++)
691 buffer[0][i] = 1 << (s->bits + point_transform - 1);
693 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
694 const int modified_predictor = mb_y ? predictor : 1;
695 uint8_t *ptr = s->picture_ptr->data[0] + (linesize * mb_y);
697 if (s->interlaced && s->bottom_field)
698 ptr += linesize >> 1;
700 for (i = 0; i < 3; i++)
701 top[i] = left[i] = topleft[i] = buffer[0][i];
703 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
704 if (s->restart_interval && !s->restart_count)
705 s->restart_count = s->restart_interval;
707 for (i = 0; i < 3; i++) {
711 top[i] = buffer[mb_x][i];
713 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
715 left[i] = buffer[mb_x][i] =
716 mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
719 if (s->restart_interval && !--s->restart_count) {
720 align_get_bits(&s->gb);
721 skip_bits(&s->gb, 16); /* skip RSTn */
726 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
727 ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
728 ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
729 ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
731 } else if (s->pegasus_rct) {
732 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
733 ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
734 ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
735 ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
738 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
739 ptr[4 * mb_x + 0] = buffer[mb_x][2];
740 ptr[4 * mb_x + 1] = buffer[mb_x][1];
741 ptr[4 * mb_x + 2] = buffer[mb_x][0];
748 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
749 int point_transform, int nb_components)
753 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
754 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
755 if (s->restart_interval && !s->restart_count)
756 s->restart_count = s->restart_interval;
758 if (mb_x == 0 || mb_y == 0 || s->interlaced) {
759 for (i = 0; i < nb_components; i++) {
761 int n, h, v, x, y, c, j, linesize;
763 c = s->comp_index[i];
768 linesize = s->linesize[c];
770 for (j = 0; j < n; j++) {
772 // FIXME optimize this crap
773 ptr = s->picture_ptr->data[c] +
774 (linesize * (v * mb_y + y)) +
776 if (y == 0 && mb_y == 0) {
777 if (x == 0 && mb_x == 0)
778 pred = 128 << point_transform;
782 if (x == 0 && mb_x == 0)
783 pred = ptr[-linesize];
785 PREDICT(pred, ptr[-linesize - 1],
786 ptr[-linesize], ptr[-1], predictor);
789 if (s->interlaced && s->bottom_field)
790 ptr += linesize >> 1;
791 *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
800 for (i = 0; i < nb_components; i++) {
802 int n, h, v, x, y, c, j, linesize;
804 c = s->comp_index[i];
809 linesize = s->linesize[c];
811 for (j = 0; j < n; j++) {
814 // FIXME optimize this crap
815 ptr = s->picture_ptr->data[c] +
816 (linesize * (v * mb_y + y)) +
818 PREDICT(pred, ptr[-linesize - 1],
819 ptr[-linesize], ptr[-1], predictor);
820 *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
828 if (s->restart_interval && !--s->restart_count) {
829 align_get_bits(&s->gb);
830 skip_bits(&s->gb, 16); /* skip RSTn */
837 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
838 int Al, const uint8_t *mb_bitmask,
839 const AVFrame *reference)
842 uint8_t *data[MAX_COMPONENTS];
843 const uint8_t *reference_data[MAX_COMPONENTS];
844 int linesize[MAX_COMPONENTS];
845 GetBitContext mb_bitmask_gb;
848 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
850 for (i = 0; i < nb_components; i++) {
851 int c = s->comp_index[i];
852 data[c] = s->picture_ptr->data[c];
853 reference_data[c] = reference ? reference->data[c] : NULL;
854 linesize[c] = s->linesize[c];
855 s->coefs_finished[c] |= 1;
858 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
859 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
860 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
862 if (s->restart_interval && !s->restart_count)
863 s->restart_count = s->restart_interval;
865 if (get_bits_left(&s->gb) < 0) {
866 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
867 -get_bits_left(&s->gb));
868 return AVERROR_INVALIDDATA;
870 for (i = 0; i < nb_components; i++) {
872 int n, h, v, x, y, c, j;
875 c = s->comp_index[i];
880 for (j = 0; j < n; j++) {
881 block_offset = ((linesize[c] * (v * mb_y + y) * 8) +
884 if (s->interlaced && s->bottom_field)
885 block_offset += linesize[c] >> 1;
886 ptr = data[c] + block_offset;
887 if (!s->progressive) {
889 s->hdsp.put_pixels_tab[1][0](ptr,
890 reference_data[c] + block_offset,
893 s->bdsp.clear_block(s->block);
894 if (decode_block(s, s->block, i,
895 s->dc_index[i], s->ac_index[i],
896 s->quant_matrixes[s->quant_index[c]]) < 0) {
897 av_log(s->avctx, AV_LOG_ERROR,
898 "error y=%d x=%d\n", mb_y, mb_x);
899 return AVERROR_INVALIDDATA;
901 s->idsp.idct_put(ptr, linesize[c], s->block);
904 int block_idx = s->block_stride[c] * (v * mb_y + y) +
906 int16_t *block = s->blocks[c][block_idx];
908 block[0] += get_bits1(&s->gb) *
909 s->quant_matrixes[s->quant_index[c]][0] << Al;
910 else if (decode_dc_progressive(s, block, i, s->dc_index[i],
911 s->quant_matrixes[s->quant_index[c]],
913 av_log(s->avctx, AV_LOG_ERROR,
914 "error y=%d x=%d\n", mb_y, mb_x);
915 return AVERROR_INVALIDDATA;
918 av_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x);
919 av_dlog(s->avctx, "%d %d %d %d %d %d %d %d \n",
920 mb_x, mb_y, x, y, c, s->bottom_field,
921 (v * mb_y + y) * 8, (h * mb_x + x) * 8);
929 if (s->restart_interval) {
931 i = 8 + ((-get_bits_count(&s->gb)) & 7);
933 if (show_bits(&s->gb, i) == (1 << i) - 1) {
934 int pos = get_bits_count(&s->gb);
935 align_get_bits(&s->gb);
936 while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
937 skip_bits(&s->gb, 8);
938 if ((get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
939 for (i = 0; i < nb_components; i++) /* reset dc */
940 s->last_dc[i] = 1024;
942 skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
950 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
951 int se, int Ah, int Al,
952 const uint8_t *mb_bitmask,
953 const AVFrame *reference)
957 int c = s->comp_index[0];
958 uint8_t *data = s->picture_ptr->data[c];
959 const uint8_t *reference_data = reference ? reference->data[c] : NULL;
960 int linesize = s->linesize[c];
962 int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
963 GetBitContext mb_bitmask_gb;
965 if (ss < 0 || ss >= 64 ||
966 se < ss || se >= 64 ||
968 return AVERROR_INVALIDDATA;
971 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
974 // s->coefs_finished is a bitmask for coefficients coded
975 // ss and se are parameters telling start and end coefficients
976 s->coefs_finished[c] |= (~0ULL >> (63 - (se - ss))) << ss;
977 last_scan = !~s->coefs_finished[c];
980 if (s->interlaced && s->bottom_field) {
981 int offset = linesize >> 1;
983 reference_data += offset;
986 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
987 int block_offset = mb_y * linesize * 8;
988 uint8_t *ptr = data + block_offset;
989 int block_idx = mb_y * s->block_stride[c];
990 int16_t (*block)[64] = &s->blocks[c][block_idx];
991 uint8_t *last_nnz = &s->last_nnz[c][block_idx];
992 for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
993 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
998 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
999 quant_matrix, ss, se, Al, &EOBRUN);
1001 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
1002 quant_matrix, ss, se, Al, &EOBRUN);
1004 av_log(s->avctx, AV_LOG_ERROR,
1005 "error y=%d x=%d\n", mb_y, mb_x);
1006 return AVERROR_INVALIDDATA;
1012 s->hdsp.put_pixels_tab[1][0](ptr,
1013 reference_data + block_offset,
1016 s->idsp.idct_put(ptr, linesize, *block);
1025 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
1026 const AVFrame *reference)
1028 int len, nb_components, i, h, v, predictor, point_transform;
1030 const int block_size = s->lossless ? 1 : 8;
1031 int ilv, prev_shift;
1033 /* XXX: verify len field validity */
1034 len = get_bits(&s->gb, 16);
1035 nb_components = get_bits(&s->gb, 8);
1036 if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
1037 av_log(s->avctx, AV_LOG_ERROR,
1038 "decode_sos: nb_components (%d) unsupported\n", nb_components);
1039 return AVERROR_PATCHWELCOME;
1041 if (len != 6 + 2 * nb_components) {
1042 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1043 return AVERROR_INVALIDDATA;
1045 for (i = 0; i < nb_components; i++) {
1046 id = get_bits(&s->gb, 8) - 1;
1047 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1048 /* find component index */
1049 for (index = 0; index < s->nb_components; index++)
1050 if (id == s->component_id[index])
1052 if (index == s->nb_components) {
1053 av_log(s->avctx, AV_LOG_ERROR,
1054 "decode_sos: index(%d) out of components\n", index);
1055 return AVERROR_INVALIDDATA;
1057 /* Metasoft MJPEG codec has Cb and Cr swapped */
1058 if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1059 && nb_components == 3 && s->nb_components == 3 && i)
1062 s->comp_index[i] = index;
1064 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1065 s->h_scount[i] = s->h_count[index];
1066 s->v_scount[i] = s->v_count[index];
1068 s->dc_index[i] = get_bits(&s->gb, 4);
1069 s->ac_index[i] = get_bits(&s->gb, 4);
1071 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1072 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1074 if (!s->vlcs[0][s->dc_index[i]].table ||
1075 !s->vlcs[1][s->ac_index[i]].table)
1079 predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1080 ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1081 prev_shift = get_bits(&s->gb, 4); /* Ah */
1082 point_transform = get_bits(&s->gb, 4); /* Al */
1084 if (nb_components > 1) {
1085 /* interleaved stream */
1086 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1087 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1088 } else if (!s->ls) { /* skip this for JPEG-LS */
1089 h = s->h_max / s->h_scount[0];
1090 v = s->v_max / s->v_scount[0];
1091 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1092 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1093 s->nb_blocks[0] = 1;
1098 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1099 av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n",
1100 s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1101 predictor, point_transform, ilv, s->bits,
1102 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
1105 /* mjpeg-b can have padding bytes between sos and image data, skip them */
1106 for (i = s->mjpb_skiptosod; i > 0; i--)
1107 skip_bits(&s->gb, 8);
1110 for (i = 0; i < nb_components; i++)
1111 s->last_dc[i] = 1024;
1114 if (CONFIG_JPEGLS_DECODER && s->ls) {
1116 // reset_ls_coding_parameters(s, 0);
1118 if ((ret = ff_jpegls_decode_picture(s, predictor,
1119 point_transform, ilv)) < 0)
1123 if ((ret = ljpeg_decode_rgb_scan(s, predictor,
1124 point_transform)) < 0)
1127 if ((ret = ljpeg_decode_yuv_scan(s, predictor,
1129 nb_components)) < 0)
1134 if (s->progressive && predictor) {
1135 if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor,
1142 if ((ret = mjpeg_decode_scan(s, nb_components,
1143 prev_shift, point_transform,
1144 mb_bitmask, reference)) < 0)
1149 if (s->interlaced &&
1150 get_bits_left(&s->gb) > 32 &&
1151 show_bits(&s->gb, 8) == 0xFF) {
1152 GetBitContext bak = s->gb;
1153 align_get_bits(&bak);
1154 if (show_bits(&bak, 16) == 0xFFD1) {
1155 av_dlog(s->avctx, "AVRn interlaced picture marker found\n");
1157 skip_bits(&s->gb, 16);
1158 s->bottom_field ^= 1;
1167 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1168 return AVERROR_INVALIDDATA;
1171 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1173 if (get_bits(&s->gb, 16) != 4)
1174 return AVERROR_INVALIDDATA;
1175 s->restart_interval = get_bits(&s->gb, 16);
1176 s->restart_count = 0;
1177 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
1178 s->restart_interval);
1183 static int mjpeg_decode_app(MJpegDecodeContext *s)
1187 len = get_bits(&s->gb, 16);
1189 return AVERROR_INVALIDDATA;
1190 if (8 * len > get_bits_left(&s->gb))
1191 return AVERROR_INVALIDDATA;
1193 id = get_bits_long(&s->gb, 32);
1194 id = av_be2ne32(id);
1197 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1198 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1200 /* Buggy AVID, it puts EOI only at every 10th frame. */
1201 /* Also, this fourcc is used by non-avid files too, it holds some
1202 information, but it's always present in AVID-created files. */
1203 if (id == AV_RL32("AVI1")) {
1209 4bytes field_size_less_padding
1212 i = get_bits(&s->gb, 8);
1214 s->bottom_field = 1;
1216 s->bottom_field = 0;
1218 skip_bits(&s->gb, 8);
1219 skip_bits(&s->gb, 32);
1220 skip_bits(&s->gb, 32);
1228 if (id == AV_RL32("JFIF")) {
1229 int t_w, t_h, v1, v2;
1230 skip_bits(&s->gb, 8); /* the trailing zero-byte */
1231 v1 = get_bits(&s->gb, 8);
1232 v2 = get_bits(&s->gb, 8);
1233 skip_bits(&s->gb, 8);
1235 s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
1236 s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
1237 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1239 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1240 av_log(s->avctx, AV_LOG_INFO,
1241 "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1243 s->avctx->sample_aspect_ratio.num,
1244 s->avctx->sample_aspect_ratio.den);
1246 t_w = get_bits(&s->gb, 8);
1247 t_h = get_bits(&s->gb, 8);
1249 /* skip thumbnail */
1250 if (len -10 - (t_w * t_h * 3) > 0)
1251 len -= t_w * t_h * 3;
1257 if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
1258 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1259 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1260 skip_bits(&s->gb, 16); /* version */
1261 skip_bits(&s->gb, 16); /* flags0 */
1262 skip_bits(&s->gb, 16); /* flags1 */
1263 skip_bits(&s->gb, 8); /* transform */
1268 if (id == AV_RL32("LJIF")) {
1269 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1270 av_log(s->avctx, AV_LOG_INFO,
1271 "Pegasus lossless jpeg header found\n");
1272 skip_bits(&s->gb, 16); /* version ? */
1273 skip_bits(&s->gb, 16); /* unknwon always 0? */
1274 skip_bits(&s->gb, 16); /* unknwon always 0? */
1275 skip_bits(&s->gb, 16); /* unknwon always 0? */
1276 switch (get_bits(&s->gb, 8)) {
1286 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1293 if ((s->start_code == APP1) && (len > (0x28 - 8))) {
1294 id = get_bits_long(&s->gb, 32);
1295 id = av_be2ne32(id);
1298 if (id == AV_RL32("mjpg")) {
1300 skip_bits(&s->gb, 32); /* field size */
1301 skip_bits(&s->gb, 32); /* pad field size */
1302 skip_bits(&s->gb, 32); /* next off */
1303 skip_bits(&s->gb, 32); /* quant off */
1304 skip_bits(&s->gb, 32); /* huff off */
1305 skip_bits(&s->gb, 32); /* image off */
1306 skip_bits(&s->gb, 32); /* scan off */
1307 skip_bits(&s->gb, 32); /* data off */
1309 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1310 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1315 /* slow but needed for extreme adobe jpegs */
1317 av_log(s->avctx, AV_LOG_ERROR,
1318 "mjpeg: error, decode_app parser read over the end\n");
1320 skip_bits(&s->gb, 8);
1325 static int mjpeg_decode_com(MJpegDecodeContext *s)
1327 int len = get_bits(&s->gb, 16);
1328 if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
1329 char *cbuf = av_malloc(len - 1);
1332 for (i = 0; i < len - 2; i++)
1333 cbuf[i] = get_bits(&s->gb, 8);
1334 if (i > 0 && cbuf[i - 1] == '\n')
1339 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1340 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1342 /* buggy avid, it puts EOI only at every 10th frame */
1343 if (!strcmp(cbuf, "AVID")) {
1345 } else if (!strcmp(cbuf, "CS=ITU601"))
1347 else if ((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
1348 (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
1358 /* return the 8 bit start code value and update the search
1359 state. Return -1 if no start code found */
1360 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1362 const uint8_t *buf_ptr;
1369 buf_ptr = *pbuf_ptr;
1370 while (buf_ptr < buf_end) {
1373 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1383 av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1384 *pbuf_ptr = buf_ptr;
1388 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1389 const uint8_t **buf_ptr, const uint8_t *buf_end,
1390 const uint8_t **unescaped_buf_ptr,
1391 int *unescaped_buf_size)
1394 start_code = find_marker(buf_ptr, buf_end);
1396 av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
1398 return AVERROR(ENOMEM);
1400 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1401 if (start_code == SOS && !s->ls) {
1402 const uint8_t *src = *buf_ptr;
1403 uint8_t *dst = s->buffer;
1405 while (src < buf_end) {
1406 uint8_t x = *(src++);
1409 if (s->avctx->codec_id != AV_CODEC_ID_THP) {
1411 while (src < buf_end && x == 0xff)
1414 if (x >= 0xd0 && x <= 0xd7)
1421 *unescaped_buf_ptr = s->buffer;
1422 *unescaped_buf_size = dst - s->buffer;
1423 memset(s->buffer + *unescaped_buf_size, 0,
1424 FF_INPUT_BUFFER_PADDING_SIZE);
1426 av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1427 (buf_end - *buf_ptr) - (dst - s->buffer));
1428 } else if (start_code == SOS && s->ls) {
1429 const uint8_t *src = *buf_ptr;
1430 uint8_t *dst = s->buffer;
1438 while (src + t < buf_end) {
1439 uint8_t x = src[t++];
1441 while ((src + t < buf_end) && x == 0xff)
1450 init_put_bits(&pb, dst, t);
1452 /* unescape bitstream */
1454 uint8_t x = src[b++];
1455 put_bits(&pb, 8, x);
1458 put_bits(&pb, 7, x);
1462 flush_put_bits(&pb);
1464 *unescaped_buf_ptr = dst;
1465 *unescaped_buf_size = (bit_count + 7) >> 3;
1466 memset(s->buffer + *unescaped_buf_size, 0,
1467 FF_INPUT_BUFFER_PADDING_SIZE);
1469 *unescaped_buf_ptr = *buf_ptr;
1470 *unescaped_buf_size = buf_end - *buf_ptr;
1476 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
1479 AVFrame *frame = data;
1480 const uint8_t *buf = avpkt->data;
1481 int buf_size = avpkt->size;
1482 MJpegDecodeContext *s = avctx->priv_data;
1483 const uint8_t *buf_end, *buf_ptr;
1484 const uint8_t *unescaped_buf_ptr;
1485 int unescaped_buf_size;
1489 s->got_picture = 0; // picture from previous image can not be reused
1491 buf_end = buf + buf_size;
1492 while (buf_ptr < buf_end) {
1493 /* find start next marker */
1494 start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1496 &unescaped_buf_size);
1498 if (start_code < 0) {
1500 } else if (unescaped_buf_size > INT_MAX / 8) {
1501 av_log(avctx, AV_LOG_ERROR,
1502 "MJPEG packet 0x%x too big (%d/%d), corrupt data?\n",
1503 start_code, unescaped_buf_size, buf_size);
1504 return AVERROR_INVALIDDATA;
1507 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
1508 start_code, buf_end - buf_ptr);
1510 ret = init_get_bits(&s->gb, unescaped_buf_ptr,
1511 unescaped_buf_size * 8);
1515 s->start_code = start_code;
1516 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1517 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1519 /* process markers */
1520 if (start_code >= 0xd0 && start_code <= 0xd7)
1521 av_log(avctx, AV_LOG_DEBUG,
1522 "restart marker: %d\n", start_code & 0x0f);
1524 else if (start_code >= APP0 && start_code <= APP15)
1525 mjpeg_decode_app(s);
1527 else if (start_code == COM)
1528 mjpeg_decode_com(s);
1530 if (!CONFIG_JPEGLS_DECODER &&
1531 (start_code == SOF48 || start_code == LSE)) {
1532 av_log(avctx, AV_LOG_ERROR, "JPEG-LS support not enabled.\n");
1533 return AVERROR(ENOSYS);
1536 switch (start_code) {
1538 s->restart_interval = 0;
1539 s->restart_count = 0;
1540 /* nothing to do on SOI */
1543 ff_mjpeg_decode_dqt(s);
1546 if ((ret = ff_mjpeg_decode_dht(s)) < 0) {
1547 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1556 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1563 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1570 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1577 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1581 if (!CONFIG_JPEGLS_DECODER ||
1582 (ret = ff_jpegls_decode_lse(s)) < 0)
1587 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1590 if (!s->got_picture) {
1591 av_log(avctx, AV_LOG_WARNING,
1592 "Found EOI before any SOF, ignoring\n");
1595 if (s->interlaced) {
1596 s->bottom_field ^= 1;
1597 /* if not bottom field, do not output image yet */
1598 if (s->bottom_field == !s->interlace_polarity)
1601 if ((ret = av_frame_ref(frame, s->picture_ptr)) < 0)
1605 for (i = 0; frame->data[i]; i++) {
1606 int h = frame->height >> ((i == 1 || i == 2) ?
1607 s->pix_desc->log2_chroma_h : 0);
1608 frame->data[i] += frame->linesize[i] * (h - 1);
1609 frame->linesize[i] *= -1;
1615 avctx->debug & FF_DEBUG_QP) {
1616 av_log(avctx, AV_LOG_DEBUG,
1617 "QP: %d\n", FFMAX3(s->qscale[0],
1624 if (!s->got_picture) {
1625 av_log(avctx, AV_LOG_WARNING,
1626 "Can not process SOS before SOF, skipping\n");
1629 if ((ret = ff_mjpeg_decode_sos(s, NULL, NULL)) < 0 &&
1630 (avctx->err_recognition & AV_EF_EXPLODE))
1632 /* buggy avid puts EOI every 10-20th frame */
1633 /* if restart period is over process EOI */
1634 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1638 mjpeg_decode_dri(s);
1650 av_log(avctx, AV_LOG_ERROR,
1651 "mjpeg: unsupported coding type (%x)\n", start_code);
1656 /* eof process start code */
1657 buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
1658 av_log(avctx, AV_LOG_DEBUG,
1659 "marker parser used %d bytes (%d bits)\n",
1660 (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
1662 if (s->got_picture) {
1663 av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1666 av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1667 return AVERROR_INVALIDDATA;
1669 av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n",
1671 // return buf_end - buf_ptr;
1672 return buf_ptr - buf;
1675 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1677 MJpegDecodeContext *s = avctx->priv_data;
1681 av_frame_free(&s->picture);
1682 s->picture_ptr = NULL;
1683 } else if (s->picture_ptr)
1684 av_frame_unref(s->picture_ptr);
1687 av_freep(&s->ljpeg_buffer);
1688 s->ljpeg_buffer_size = 0;
1690 for (i = 0; i < 3; i++) {
1691 for (j = 0; j < 4; j++)
1692 ff_free_vlc(&s->vlcs[i][j]);
1694 for (i = 0; i < MAX_COMPONENTS; i++) {
1695 av_freep(&s->blocks[i]);
1696 av_freep(&s->last_nnz[i]);
1701 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1702 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1703 static const AVOption options[] = {
1704 { "extern_huff", "Use external huffman table.",
1705 OFFSET(extern_huff), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
1709 static const AVClass mjpegdec_class = {
1710 .class_name = "MJPEG decoder",
1711 .item_name = av_default_item_name,
1713 .version = LIBAVUTIL_VERSION_INT,
1716 AVCodec ff_mjpeg_decoder = {
1718 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1719 .type = AVMEDIA_TYPE_VIDEO,
1720 .id = AV_CODEC_ID_MJPEG,
1721 .priv_data_size = sizeof(MJpegDecodeContext),
1722 .init = ff_mjpeg_decode_init,
1723 .close = ff_mjpeg_decode_end,
1724 .decode = ff_mjpeg_decode_frame,
1725 .capabilities = CODEC_CAP_DR1,
1726 .priv_class = &mjpegdec_class,
1727 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
1730 AVCodec ff_thp_decoder = {
1732 .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
1733 .type = AVMEDIA_TYPE_VIDEO,
1734 .id = AV_CODEC_ID_THP,
1735 .priv_data_size = sizeof(MJpegDecodeContext),
1736 .init = ff_mjpeg_decode_init,
1737 .close = ff_mjpeg_decode_end,
1738 .decode = ff_mjpeg_decode_frame,
1739 .capabilities = CODEC_CAP_DR1,
1740 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,