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], ff_mjpeg_bits_dc_luminance,
71 ff_mjpeg_val_dc, 12, 0, 0);
72 build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,
73 ff_mjpeg_val_dc, 12, 0, 0);
74 build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance,
75 ff_mjpeg_val_ac_luminance, 251, 0, 1);
76 build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance,
77 ff_mjpeg_val_ac_chrominance, 251, 0, 1);
78 build_vlc(&s->vlcs[2][0], ff_mjpeg_bits_ac_luminance,
79 ff_mjpeg_val_ac_luminance, 251, 0, 0);
80 build_vlc(&s->vlcs[2][1], ff_mjpeg_bits_ac_chrominance,
81 ff_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) {
104 av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
105 init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
106 if (ff_mjpeg_decode_dht(s)) {
107 av_log(avctx, AV_LOG_ERROR,
108 "mjpeg: error using external huffman table\n");
109 return AVERROR_INVALIDDATA;
112 if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
113 s->interlace_polarity = 1; /* bottom field first */
114 av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
116 if (avctx->codec->id == CODEC_ID_AMV)
123 /* quantize tables */
124 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
126 int len, index, i, j;
128 len = get_bits(&s->gb, 16) - 2;
131 /* only 8 bit precision handled */
132 if (get_bits(&s->gb, 4) != 0) {
133 av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
136 index = get_bits(&s->gb, 4);
139 av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
140 /* read quant table */
141 for (i = 0; i < 64; i++) {
142 j = s->scantable.permutated[i];
143 s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
146 // XXX FIXME finetune, and perhaps add dc too
147 s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
148 s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
149 av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
150 index, s->qscale[index]);
156 /* decode huffman tables and build VLC decoders */
157 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
159 int len, index, i, class, n, v, code_max;
160 uint8_t bits_table[17];
161 uint8_t val_table[256];
163 len = get_bits(&s->gb, 16) - 2;
168 class = get_bits(&s->gb, 4);
171 index = get_bits(&s->gb, 4);
175 for (i = 1; i <= 16; i++) {
176 bits_table[i] = get_bits(&s->gb, 8);
180 if (len < n || n > 256)
184 for (i = 0; i < n; i++) {
185 v = get_bits(&s->gb, 8);
192 /* build VLC and flush previous vlc if present */
193 ff_free_vlc(&s->vlcs[class][index]);
194 av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
195 class, index, code_max + 1);
196 if (build_vlc(&s->vlcs[class][index], bits_table, val_table,
197 code_max + 1, 0, class > 0) < 0)
201 ff_free_vlc(&s->vlcs[2][index]);
202 if (build_vlc(&s->vlcs[2][index], bits_table, val_table,
203 code_max + 1, 0, 0) < 0)
210 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
212 int len, nb_components, i, width, height, pix_fmt_id;
214 /* XXX: verify len field validity */
215 len = get_bits(&s->gb, 16);
216 s->bits = get_bits(&s->gb, 8);
220 if (s->bits == 9 && !s->pegasus_rct)
221 s->rct = 1; // FIXME ugly
223 if (s->bits != 8 && !s->lossless) {
224 av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
228 height = get_bits(&s->gb, 16);
229 width = get_bits(&s->gb, 16);
231 // HACK for odd_height.mov
232 if (s->interlaced && s->width == width && s->height == height + 1)
235 av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
236 if (av_image_check_size(width, height, 0, s->avctx))
239 nb_components = get_bits(&s->gb, 8);
240 if (nb_components <= 0 ||
241 nb_components > MAX_COMPONENTS)
243 if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
244 av_log(s->avctx, AV_LOG_ERROR,
245 "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
248 s->nb_components = nb_components;
251 for (i = 0; i < nb_components; i++) {
253 s->component_id[i] = get_bits(&s->gb, 8) - 1;
254 s->h_count[i] = get_bits(&s->gb, 4);
255 s->v_count[i] = get_bits(&s->gb, 4);
256 /* compute hmax and vmax (only used in interleaved case) */
257 if (s->h_count[i] > s->h_max)
258 s->h_max = s->h_count[i];
259 if (s->v_count[i] > s->v_max)
260 s->v_max = s->v_count[i];
261 s->quant_index[i] = get_bits(&s->gb, 8);
262 if (s->quant_index[i] >= 4)
264 av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
265 i, s->h_count[i], s->v_count[i],
266 s->component_id[i], s->quant_index[i]);
269 if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
270 av_log(s->avctx, AV_LOG_ERROR,
271 "Subsampling in JPEG-LS is not supported.\n");
275 if (s->v_max == 1 && s->h_max == 1 && s->lossless == 1)
278 /* if different size, realloc/alloc picture */
279 /* XXX: also check h_count and v_count */
280 if (width != s->width || height != s->height) {
281 av_freep(&s->qscale_table);
287 /* test interlaced mode */
288 if (s->first_picture &&
289 s->org_height != 0 &&
290 s->height < ((s->org_height * 3) / 4)) {
292 s->bottom_field = s->interlace_polarity;
293 s->picture_ptr->interlaced_frame = 1;
294 s->picture_ptr->top_field_first = !s->interlace_polarity;
298 avcodec_set_dimensions(s->avctx, width, height);
300 s->qscale_table = av_mallocz((s->width + 15) / 16);
301 s->first_picture = 0;
304 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 = PIX_FMT_BGRA;
325 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
326 assert(s->nb_components == 3);
329 s->avctx->pix_fmt = PIX_FMT_GRAY8;
332 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
335 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
338 s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
341 av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
345 if (s->nb_components > 1)
346 s->avctx->pix_fmt = PIX_FMT_RGB24;
347 else if (s->bits <= 8)
348 s->avctx->pix_fmt = PIX_FMT_GRAY8;
350 s->avctx->pix_fmt = 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 // printf("%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);
374 /* totally blank picture as progressive JPEG will only add details to it */
375 if (s->progressive) {
376 int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
377 int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
378 for (i = 0; i < s->nb_components; i++) {
379 int size = bw * bh * s->h_count[i] * s->v_count[i];
380 av_freep(&s->blocks[i]);
381 av_freep(&s->last_nnz[i]);
382 s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
383 s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
384 s->block_stride[i] = bw * s->h_count[i];
386 memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
391 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
394 code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
396 av_log(s->avctx, AV_LOG_WARNING,
397 "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
398 0, dc_index, &s->vlcs[0][dc_index]);
403 return get_xbits(&s->gb, code);
408 /* decode block and dequantize */
409 static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,
410 int dc_index, int ac_index, int16_t *quant_matrix)
412 int code, i, j, level, val;
415 val = mjpeg_decode_dc(s, dc_index);
417 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
420 val = val * quant_matrix[0] + s->last_dc[component];
421 s->last_dc[component] = val;
425 {OPEN_READER(re, &s->gb);
427 UPDATE_CACHE(re, &s->gb);
428 GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
430 i += ((unsigned)code) >> 4;
433 if (code > MIN_CACHE_BITS - 16)
434 UPDATE_CACHE(re, &s->gb);
437 int cache = GET_CACHE(re, &s->gb);
438 int sign = (~cache) >> 31;
439 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
442 LAST_SKIP_BITS(re, &s->gb, code);
445 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
448 j = s->scantable.permutated[i];
449 block[j] = level * quant_matrix[j];
452 CLOSE_READER(re, &s->gb);}
457 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block,
458 int component, int dc_index,
459 int16_t *quant_matrix, int Al)
462 s->dsp.clear_block(block);
463 val = mjpeg_decode_dc(s, dc_index);
465 av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
468 val = (val * quant_matrix[0] << Al) + s->last_dc[component];
469 s->last_dc[component] = val;
474 /* decode block and dequantize - progressive JPEG version */
475 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
476 uint8_t *last_nnz, int ac_index,
477 int16_t *quant_matrix,
478 int ss, int se, int Al, int *EOBRUN)
480 int code, i, j, level, val, run;
488 OPEN_READER(re, &s->gb);
489 for (i = ss; ; i++) {
490 UPDATE_CACHE(re, &s->gb);
491 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
493 run = ((unsigned) code) >> 4;
497 if (code > MIN_CACHE_BITS - 16)
498 UPDATE_CACHE(re, &s->gb);
501 int cache = GET_CACHE(re, &s->gb);
502 int sign = (~cache) >> 31;
503 level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
506 LAST_SKIP_BITS(re, &s->gb, code);
510 j = s->scantable.permutated[se];
511 block[j] = level * quant_matrix[j] << Al;
514 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
517 j = s->scantable.permutated[i];
518 block[j] = level * quant_matrix[j] << Al;
520 if (run == 0xF) {// ZRL - skip 15 coefficients
523 av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
529 UPDATE_CACHE(re, &s->gb);
530 val += NEG_USR32(GET_CACHE(re, &s->gb), run);
531 LAST_SKIP_BITS(re, &s->gb, run);
538 CLOSE_READER(re, &s->gb);
547 #define REFINE_BIT(j) { \
548 UPDATE_CACHE(re, &s->gb); \
549 sign = block[j] >> 15; \
550 block[j] += SHOW_UBITS(re, &s->gb, 1) * \
551 ((quant_matrix[j] ^ sign) - sign) << Al; \
552 LAST_SKIP_BITS(re, &s->gb, 1); \
560 av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
565 j = s->scantable.permutated[i]; \
568 else if (run-- == 0) \
572 /* decode block and dequantize - progressive JPEG refinement pass */
573 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block,
575 int ac_index, int16_t *quant_matrix,
576 int ss, int se, int Al, int *EOBRUN)
578 int code, i = ss, j, sign, val, run;
579 int last = FFMIN(se, *last_nnz);
581 OPEN_READER(re, &s->gb);
586 UPDATE_CACHE(re, &s->gb);
587 GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
590 run = ((unsigned) code) >> 4;
591 UPDATE_CACHE(re, &s->gb);
592 val = SHOW_UBITS(re, &s->gb, 1);
593 LAST_SKIP_BITS(re, &s->gb, 1);
595 j = s->scantable.permutated[i];
597 block[j] = ((quant_matrix[j]^val) - val) << Al;
601 CLOSE_READER(re, &s->gb);
605 run = ((unsigned) code) >> 4;
612 UPDATE_CACHE(re, &s->gb);
613 run += SHOW_UBITS(re, &s->gb, val);
614 LAST_SKIP_BITS(re, &s->gb, val);
626 for (; i <= last; i++) {
627 j = s->scantable.permutated[i];
631 CLOSE_READER(re, &s->gb);
638 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor,
642 uint16_t (*buffer)[4];
643 int left[3], top[3], topleft[3];
644 const int linesize = s->linesize[0];
645 const int mask = (1 << s->bits) - 1;
647 av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
648 (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
649 buffer = s->ljpeg_buffer;
651 for (i = 0; i < 3; i++)
652 buffer[0][i] = 1 << (s->bits + point_transform - 1);
654 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
655 const int modified_predictor = mb_y ? predictor : 1;
656 uint8_t *ptr = s->picture_ptr->data[0] + (linesize * mb_y);
658 if (s->interlaced && s->bottom_field)
659 ptr += linesize >> 1;
661 for (i = 0; i < 3; i++)
662 top[i] = left[i] = topleft[i] = buffer[0][i];
664 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
665 if (s->restart_interval && !s->restart_count)
666 s->restart_count = s->restart_interval;
668 for (i = 0; i < 3; i++) {
672 top[i] = buffer[mb_x][i];
674 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
676 left[i] = buffer[mb_x][i] =
677 mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
680 if (s->restart_interval && !--s->restart_count) {
681 align_get_bits(&s->gb);
682 skip_bits(&s->gb, 16); /* skip RSTn */
687 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
688 ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
689 ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
690 ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
692 } else if (s->pegasus_rct) {
693 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
694 ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
695 ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
696 ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
699 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
700 ptr[4 * mb_x + 0] = buffer[mb_x][2];
701 ptr[4 * mb_x + 1] = buffer[mb_x][1];
702 ptr[4 * mb_x + 2] = buffer[mb_x][0];
709 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
713 const int nb_components = 3;
715 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
716 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
717 if (s->restart_interval && !s->restart_count)
718 s->restart_count = s->restart_interval;
720 if (mb_x == 0 || mb_y == 0 || s->interlaced) {
721 for (i = 0; i < nb_components; i++) {
723 int n, h, v, x, y, c, j, linesize;
725 c = s->comp_index[i];
730 linesize = s->linesize[c];
732 for (j = 0; j < n; j++) {
734 // FIXME optimize this crap
735 ptr = s->picture_ptr->data[c] +
736 (linesize * (v * mb_y + y)) +
738 if (y == 0 && mb_y == 0) {
739 if (x == 0 && mb_x == 0)
740 pred = 128 << point_transform;
744 if (x == 0 && mb_x == 0)
745 pred = ptr[-linesize];
747 PREDICT(pred, ptr[-linesize - 1],
748 ptr[-linesize], ptr[-1], predictor);
751 if (s->interlaced && s->bottom_field)
752 ptr += linesize >> 1;
753 *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
762 for (i = 0; i < nb_components; i++) {
764 int n, h, v, x, y, c, j, linesize;
766 c = s->comp_index[i];
771 linesize = s->linesize[c];
773 for (j = 0; j < n; j++) {
776 // FIXME optimize this crap
777 ptr = s->picture_ptr->data[c] +
778 (linesize * (v * mb_y + y)) +
780 PREDICT(pred, ptr[-linesize - 1],
781 ptr[-linesize], ptr[-1], predictor);
782 *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
790 if (s->restart_interval && !--s->restart_count) {
791 align_get_bits(&s->gb);
792 skip_bits(&s->gb, 16); /* skip RSTn */
799 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
800 int linesize, int lowres)
803 case 0: copy_block8(dst, src, linesize, linesize, 8);
805 case 1: copy_block4(dst, src, linesize, linesize, 4);
807 case 2: copy_block2(dst, src, linesize, linesize, 2);
814 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
815 int Al, const uint8_t *mb_bitmask,
816 const AVFrame *reference)
819 uint8_t *data[MAX_COMPONENTS];
820 const uint8_t *reference_data[MAX_COMPONENTS];
821 int linesize[MAX_COMPONENTS];
822 GetBitContext mb_bitmask_gb;
825 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
827 if (s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
828 av_log(s->avctx, AV_LOG_ERROR,
829 "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
833 for (i = 0; i < nb_components; i++) {
834 int c = s->comp_index[i];
835 data[c] = s->picture_ptr->data[c];
836 reference_data[c] = reference ? reference->data[c] : NULL;
837 linesize[c] = s->linesize[c];
838 s->coefs_finished[c] |= 1;
840 // picture should be flipped upside-down for this codec
841 int offset = (linesize[c] * (s->v_scount[i] *
842 (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
844 reference_data[c] += offset;
849 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
850 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
851 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
853 if (s->restart_interval && !s->restart_count)
854 s->restart_count = s->restart_interval;
856 if (get_bits_left(&s->gb) < 0) {
857 av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
858 -get_bits_left(&s->gb));
861 for (i = 0; i < nb_components; i++) {
863 int n, h, v, x, y, c, j;
866 c = s->comp_index[i];
871 for (j = 0; j < n; j++) {
872 block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
873 (h * mb_x + x) * 8) >> s->avctx->lowres);
875 if (s->interlaced && s->bottom_field)
876 block_offset += linesize[c] >> 1;
877 ptr = data[c] + block_offset;
878 if (!s->progressive) {
880 mjpeg_copy_block(ptr, reference_data[c] + block_offset,
881 linesize[c], s->avctx->lowres);
883 s->dsp.clear_block(s->block);
884 if (decode_block(s, s->block, i,
885 s->dc_index[i], s->ac_index[i],
886 s->quant_matrixes[s->quant_index[c]]) < 0) {
887 av_log(s->avctx, AV_LOG_ERROR,
888 "error y=%d x=%d\n", mb_y, mb_x);
891 s->dsp.idct_put(ptr, linesize[c], s->block);
894 int block_idx = s->block_stride[c] * (v * mb_y + y) +
896 DCTELEM *block = s->blocks[c][block_idx];
898 block[0] += get_bits1(&s->gb) *
899 s->quant_matrixes[s->quant_index[c]][0] << Al;
900 else if (decode_dc_progressive(s, block, i, s->dc_index[i],
901 s->quant_matrixes[s->quant_index[c]],
903 av_log(s->avctx, AV_LOG_ERROR,
904 "error y=%d x=%d\n", mb_y, mb_x);
908 // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n",
910 // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n",
911 // mb_x, mb_y, x, y, c, s->bottom_field,
912 // (v * mb_y + y) * 8, (h * mb_x + x) * 8);
920 if (s->restart_interval) {
922 i = 8 + ((-get_bits_count(&s->gb)) & 7);
924 if (show_bits(&s->gb, i) == (1 << i) - 1) {
925 int pos = get_bits_count(&s->gb);
926 align_get_bits(&s->gb);
927 while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
928 skip_bits(&s->gb, 8);
929 if ((get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
930 for (i = 0; i < nb_components; i++) /* reset dc */
931 s->last_dc[i] = 1024;
933 skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
941 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
942 int se, int Ah, int Al,
943 const uint8_t *mb_bitmask,
944 const AVFrame *reference)
948 int c = s->comp_index[0];
949 uint8_t *data = s->picture_ptr->data[c];
950 const uint8_t *reference_data = reference ? reference->data[c] : NULL;
951 int linesize = s->linesize[c];
953 int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
954 GetBitContext mb_bitmask_gb;
957 init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
960 s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
961 last_scan = !~s->coefs_finished[c];
964 if (s->interlaced && s->bottom_field) {
965 int offset = linesize >> 1;
967 reference_data += offset;
970 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
971 int block_offset = (mb_y * linesize * 8 >> s->avctx->lowres);
972 uint8_t *ptr = data + block_offset;
973 int block_idx = mb_y * s->block_stride[c];
974 DCTELEM (*block)[64] = &s->blocks[c][block_idx];
975 uint8_t *last_nnz = &s->last_nnz[c][block_idx];
976 for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
977 const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
982 ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
983 quant_matrix, ss, se, Al, &EOBRUN);
985 ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
986 quant_matrix, ss, se, Al, &EOBRUN);
988 av_log(s->avctx, AV_LOG_ERROR,
989 "error y=%d x=%d\n", mb_y, mb_x);
996 mjpeg_copy_block(ptr, reference_data + block_offset,
997 linesize, s->avctx->lowres);
999 s->dsp.idct_put(ptr, linesize, *block);
1000 ptr += 8 >> s->avctx->lowres;
1008 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
1009 const AVFrame *reference)
1011 int len, nb_components, i, h, v, predictor, point_transform;
1013 const int block_size = s->lossless ? 1 : 8;
1014 int ilv, prev_shift;
1016 /* XXX: verify len field validity */
1017 len = get_bits(&s->gb, 16);
1018 nb_components = get_bits(&s->gb, 8);
1019 if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
1020 av_log(s->avctx, AV_LOG_ERROR,
1021 "decode_sos: nb_components (%d) unsupported\n", nb_components);
1024 if (len != 6 + 2 * nb_components) {
1025 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1028 for (i = 0; i < nb_components; i++) {
1029 id = get_bits(&s->gb, 8) - 1;
1030 av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1031 /* find component index */
1032 for (index = 0; index < s->nb_components; index++)
1033 if (id == s->component_id[index])
1035 if (index == s->nb_components) {
1036 av_log(s->avctx, AV_LOG_ERROR,
1037 "decode_sos: index(%d) out of components\n", index);
1040 /* Metasoft MJPEG codec has Cb and Cr swapped */
1041 if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1042 && nb_components == 3 && s->nb_components == 3 && i)
1045 s->comp_index[i] = index;
1047 s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1048 s->h_scount[i] = s->h_count[index];
1049 s->v_scount[i] = s->v_count[index];
1051 s->dc_index[i] = get_bits(&s->gb, 4);
1052 s->ac_index[i] = get_bits(&s->gb, 4);
1054 if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1055 s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1057 if (!s->vlcs[0][s->dc_index[i]].table ||
1058 !s->vlcs[1][s->ac_index[i]].table)
1062 predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1063 ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1064 prev_shift = get_bits(&s->gb, 4); /* Ah */
1065 point_transform = get_bits(&s->gb, 4); /* Al */
1067 for (i = 0; i < nb_components; i++)
1068 s->last_dc[i] = 1024;
1070 if (nb_components > 1) {
1071 /* interleaved stream */
1072 s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1073 s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1074 } else if (!s->ls) { /* skip this for JPEG-LS */
1075 h = s->h_max / s->h_scount[0];
1076 v = s->v_max / s->v_scount[0];
1077 s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1078 s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1079 s->nb_blocks[0] = 1;
1084 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1085 av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n",
1086 s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1087 predictor, point_transform, ilv, s->bits,
1088 s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
1091 /* mjpeg-b can have padding bytes between sos and image data, skip them */
1092 for (i = s->mjpb_skiptosod; i > 0; i--)
1093 skip_bits(&s->gb, 8);
1096 if (CONFIG_JPEGLS_DECODER && s->ls) {
1098 // reset_ls_coding_parameters(s, 0);
1100 if (ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
1104 if (ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
1107 if (ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
1112 if (s->progressive && predictor) {
1113 if (mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift,
1115 mb_bitmask, reference) < 0)
1118 if (mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
1119 mb_bitmask, reference) < 0)
1126 av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1130 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1132 if (get_bits(&s->gb, 16) != 4)
1134 s->restart_interval = get_bits(&s->gb, 16);
1135 s->restart_count = 0;
1136 av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
1137 s->restart_interval);
1142 static int mjpeg_decode_app(MJpegDecodeContext *s)
1146 len = get_bits(&s->gb, 16);
1149 if (8 * len > get_bits_left(&s->gb))
1152 id = get_bits_long(&s->gb, 32);
1153 id = av_be2ne32(id);
1156 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1157 av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1159 /* Buggy AVID, it puts EOI only at every 10th frame. */
1160 /* Also, this fourcc is used by non-avid files too, it holds some
1161 information, but it's always present in AVID-created files. */
1162 if (id == AV_RL32("AVI1")) {
1168 4bytes field_size_less_padding
1171 // if (s->first_picture)
1172 // printf("mjpeg: workarounding buggy AVID\n");
1173 i = get_bits(&s->gb, 8);
1175 s->bottom_field = 1;
1177 s->bottom_field = 0;
1179 skip_bits(&s->gb, 8);
1180 skip_bits(&s->gb, 32);
1181 skip_bits(&s->gb, 32);
1184 // if (s->interlace_polarity)
1185 // printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
1191 if (id == AV_RL32("JFIF")) {
1192 int t_w, t_h, v1, v2;
1193 skip_bits(&s->gb, 8); /* the trailing zero-byte */
1194 v1 = get_bits(&s->gb, 8);
1195 v2 = get_bits(&s->gb, 8);
1196 skip_bits(&s->gb, 8);
1198 s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
1199 s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
1201 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1202 av_log(s->avctx, AV_LOG_INFO,
1203 "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1205 s->avctx->sample_aspect_ratio.num,
1206 s->avctx->sample_aspect_ratio.den);
1208 t_w = get_bits(&s->gb, 8);
1209 t_h = get_bits(&s->gb, 8);
1211 /* skip thumbnail */
1212 if (len -10 - (t_w * t_h * 3) > 0)
1213 len -= t_w * t_h * 3;
1219 if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
1220 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1221 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1222 skip_bits(&s->gb, 16); /* version */
1223 skip_bits(&s->gb, 16); /* flags0 */
1224 skip_bits(&s->gb, 16); /* flags1 */
1225 skip_bits(&s->gb, 8); /* transform */
1230 if (id == AV_RL32("LJIF")) {
1231 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1232 av_log(s->avctx, AV_LOG_INFO,
1233 "Pegasus lossless jpeg header found\n");
1234 skip_bits(&s->gb, 16); /* version ? */
1235 skip_bits(&s->gb, 16); /* unknwon always 0? */
1236 skip_bits(&s->gb, 16); /* unknwon always 0? */
1237 skip_bits(&s->gb, 16); /* unknwon always 0? */
1238 switch (get_bits(&s->gb, 8)) {
1248 av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1255 if ((s->start_code == APP1) && (len > (0x28 - 8))) {
1256 id = get_bits_long(&s->gb, 32);
1257 id = av_be2ne32(id);
1260 if (id == AV_RL32("mjpg")) {
1262 skip_bits(&s->gb, 32); /* field size */
1263 skip_bits(&s->gb, 32); /* pad field size */
1264 skip_bits(&s->gb, 32); /* next off */
1265 skip_bits(&s->gb, 32); /* quant off */
1266 skip_bits(&s->gb, 32); /* huff off */
1267 skip_bits(&s->gb, 32); /* image off */
1268 skip_bits(&s->gb, 32); /* scan off */
1269 skip_bits(&s->gb, 32); /* data off */
1271 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1272 av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1277 /* slow but needed for extreme adobe jpegs */
1279 av_log(s->avctx, AV_LOG_ERROR,
1280 "mjpeg: error, decode_app parser read over the end\n");
1282 skip_bits(&s->gb, 8);
1287 static int mjpeg_decode_com(MJpegDecodeContext *s)
1289 int len = get_bits(&s->gb, 16);
1290 if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
1291 char *cbuf = av_malloc(len - 1);
1294 for (i = 0; i < len - 2; i++)
1295 cbuf[i] = get_bits(&s->gb, 8);
1296 if (i > 0 && cbuf[i - 1] == '\n')
1301 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1302 av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1304 /* buggy avid, it puts EOI only at every 10th frame */
1305 if (!strcmp(cbuf, "AVID")) {
1307 // if (s->first_picture)
1308 // printf("mjpeg: workarounding buggy AVID\n");
1309 } else if (!strcmp(cbuf, "CS=ITU601"))
1311 else if ((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
1312 (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
1322 /* return the 8 bit start code value and update the search
1323 state. Return -1 if no start code found */
1324 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1326 const uint8_t *buf_ptr;
1333 buf_ptr = *pbuf_ptr;
1334 while (buf_ptr < buf_end) {
1337 if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1347 av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1348 *pbuf_ptr = buf_ptr;
1352 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1353 const uint8_t **buf_ptr, const uint8_t *buf_end,
1354 const uint8_t **unescaped_buf_ptr,
1355 int *unescaped_buf_size)
1358 start_code = find_marker(buf_ptr, buf_end);
1360 av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
1362 return AVERROR(ENOMEM);
1364 /* unescape buffer of SOS, use special treatment for JPEG-LS */
1365 if (start_code == SOS && !s->ls) {
1366 const uint8_t *src = *buf_ptr;
1367 uint8_t *dst = s->buffer;
1369 while (src < buf_end) {
1370 uint8_t x = *(src++);
1373 if (s->avctx->codec_id != CODEC_ID_THP) {
1375 while (src < buf_end && x == 0xff)
1378 if (x >= 0xd0 && x <= 0xd7)
1385 *unescaped_buf_ptr = s->buffer;
1386 *unescaped_buf_size = dst - s->buffer;
1388 av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1389 (buf_end - *buf_ptr) - (dst - s->buffer));
1390 } else if (start_code == SOS && s->ls) {
1391 const uint8_t *src = *buf_ptr;
1392 uint8_t *dst = s->buffer;
1400 while (src + t < buf_end) {
1401 uint8_t x = src[t++];
1403 while ((src + t < buf_end) && x == 0xff)
1412 init_put_bits(&pb, dst, t);
1414 /* unescape bitstream */
1416 uint8_t x = src[b++];
1417 put_bits(&pb, 8, x);
1420 put_bits(&pb, 7, x);
1424 flush_put_bits(&pb);
1426 *unescaped_buf_ptr = dst;
1427 *unescaped_buf_size = (bit_count + 7) >> 3;
1429 *unescaped_buf_ptr = *buf_ptr;
1430 *unescaped_buf_size = buf_end - *buf_ptr;
1436 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
1439 const uint8_t *buf = avpkt->data;
1440 int buf_size = avpkt->size;
1441 MJpegDecodeContext *s = avctx->priv_data;
1442 const uint8_t *buf_end, *buf_ptr;
1443 const uint8_t *unescaped_buf_ptr;
1444 int unescaped_buf_size;
1446 AVFrame *picture = data;
1448 s->got_picture = 0; // picture from previous image can not be reused
1450 buf_end = buf + buf_size;
1451 while (buf_ptr < buf_end) {
1452 /* find start next marker */
1453 start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1455 &unescaped_buf_size);
1457 if (start_code < 0) {
1459 } else if (unescaped_buf_size > (1U<<29)) {
1460 av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
1461 start_code, unescaped_buf_size, buf_size);
1462 return AVERROR_INVALIDDATA;
1464 av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
1465 start_code, buf_end - buf_ptr);
1467 init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
1469 s->start_code = start_code;
1470 if (s->avctx->debug & FF_DEBUG_STARTCODE)
1471 av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1473 /* process markers */
1474 if (start_code >= 0xd0 && start_code <= 0xd7)
1475 av_log(avctx, AV_LOG_DEBUG,
1476 "restart marker: %d\n", start_code & 0x0f);
1478 else if (start_code >= APP0 && start_code <= APP15)
1479 mjpeg_decode_app(s);
1481 else if (start_code == COM)
1482 mjpeg_decode_com(s);
1484 switch (start_code) {
1486 s->restart_interval = 0;
1487 s->restart_count = 0;
1488 /* nothing to do on SOI */
1491 ff_mjpeg_decode_dqt(s);
1494 if (ff_mjpeg_decode_dht(s) < 0) {
1495 av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1504 if (ff_mjpeg_decode_sof(s) < 0)
1511 if (ff_mjpeg_decode_sof(s) < 0)
1518 if (ff_mjpeg_decode_sof(s) < 0)
1525 if (ff_mjpeg_decode_sof(s) < 0)
1529 if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
1534 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1537 if (!s->got_picture) {
1538 av_log(avctx, AV_LOG_WARNING,
1539 "Found EOI before any SOF, ignoring\n");
1542 if (s->interlaced) {
1543 s->bottom_field ^= 1;
1544 /* if not bottom field, do not output image yet */
1545 if (s->bottom_field == !s->interlace_polarity)
1548 *picture = *s->picture_ptr;
1549 *data_size = sizeof(AVFrame);
1552 picture->quality = FFMAX3(s->qscale[0],
1555 picture->qstride = 0;
1556 picture->qscale_table = s->qscale_table;
1557 memset(picture->qscale_table, picture->quality,
1558 (s->width + 15) / 16);
1559 if (avctx->debug & FF_DEBUG_QP)
1560 av_log(avctx, AV_LOG_DEBUG,
1561 "QP: %d\n", picture->quality);
1562 picture->quality *= FF_QP2LAMBDA;
1567 if (!s->got_picture) {
1568 av_log(avctx, AV_LOG_WARNING,
1569 "Can not process SOS before SOF, skipping\n");
1572 if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
1573 (avctx->err_recognition & AV_EF_EXPLODE))
1574 return AVERROR_INVALIDDATA;
1575 /* buggy avid puts EOI every 10-20th frame */
1576 /* if restart period is over process EOI */
1577 if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1581 mjpeg_decode_dri(s);
1593 av_log(avctx, AV_LOG_ERROR,
1594 "mjpeg: unsupported coding type (%x)\n", start_code);
1597 // printf("mjpeg: unsupported marker (%x)\n", start_code);
1602 /* eof process start code */
1603 buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
1604 av_log(avctx, AV_LOG_DEBUG,
1605 "marker parser used %d bytes (%d bits)\n",
1606 (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
1609 if (s->got_picture) {
1610 av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1613 av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1616 av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n",
1618 // return buf_end - buf_ptr;
1619 return buf_ptr - buf;
1622 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1624 MJpegDecodeContext *s = avctx->priv_data;
1627 if (s->picture_ptr && s->picture_ptr->data[0])
1628 avctx->release_buffer(avctx, s->picture_ptr);
1631 av_free(s->qscale_table);
1632 av_freep(&s->ljpeg_buffer);
1633 s->ljpeg_buffer_size = 0;
1635 for (i = 0; i < 3; i++) {
1636 for (j = 0; j < 4; j++)
1637 ff_free_vlc(&s->vlcs[i][j]);
1639 for (i = 0; i < MAX_COMPONENTS; i++) {
1640 av_freep(&s->blocks[i]);
1641 av_freep(&s->last_nnz[i]);
1646 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1647 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1648 static const AVOption options[] = {
1649 { "extern_huff", "Use external huffman table.",
1650 OFFSET(extern_huff), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD },
1654 static const AVClass mjpegdec_class = {
1655 .class_name = "MJPEG decoder",
1656 .item_name = av_default_item_name,
1658 .version = LIBAVUTIL_VERSION_INT,
1661 AVCodec ff_mjpeg_decoder = {
1663 .type = AVMEDIA_TYPE_VIDEO,
1664 .id = CODEC_ID_MJPEG,
1665 .priv_data_size = sizeof(MJpegDecodeContext),
1666 .init = ff_mjpeg_decode_init,
1667 .close = ff_mjpeg_decode_end,
1668 .decode = ff_mjpeg_decode_frame,
1669 .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,
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,
1685 .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),