2 * Go2Webinar / Go2Meeting decoder
3 * Copyright (c) 2012 Konstantin Shishkov
4 * Copyright (c) 2013 Maxim Poliakovski
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * Go2Webinar / Go2Meeting decoder
31 #include "libavutil/imgutils.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/mem_internal.h"
37 #include "bytestream.h"
42 #include "jpegtables.h"
45 #define EPIC_PIX_STACK_SIZE 1024
46 #define EPIC_PIX_STACK_MAX (EPIC_PIX_STACK_SIZE - 1)
62 static const uint8_t luma_quant[64] = {
63 8, 6, 5, 8, 12, 20, 26, 31,
64 6, 6, 7, 10, 13, 29, 30, 28,
65 7, 7, 8, 12, 20, 29, 35, 28,
66 7, 9, 11, 15, 26, 44, 40, 31,
67 9, 11, 19, 28, 34, 55, 52, 39,
68 12, 18, 28, 32, 41, 52, 57, 46,
69 25, 32, 39, 44, 52, 61, 60, 51,
70 36, 46, 48, 49, 56, 50, 52, 50
73 static const uint8_t chroma_quant[64] = {
74 9, 9, 12, 24, 50, 50, 50, 50,
75 9, 11, 13, 33, 50, 50, 50, 50,
76 12, 13, 28, 50, 50, 50, 50, 50,
77 24, 33, 50, 50, 50, 50, 50, 50,
78 50, 50, 50, 50, 50, 50, 50, 50,
79 50, 50, 50, 50, 50, 50, 50, 50,
80 50, 50, 50, 50, 50, 50, 50, 50,
81 50, 50, 50, 50, 50, 50, 50, 50,
84 typedef struct ePICPixListElem {
85 struct ePICPixListElem *next;
90 typedef struct ePICPixHashElem {
92 struct ePICPixListElem *list;
95 #define EPIC_HASH_SIZE 256
96 typedef struct ePICPixHash {
97 ePICPixHashElem *bucket[EPIC_HASH_SIZE];
98 int bucket_size[EPIC_HASH_SIZE];
99 int bucket_fill[EPIC_HASH_SIZE];
102 typedef struct ePICContext {
105 ElsUnsignedRung unsigned_rung;
108 uint8_t W_ctx_rung[256];
109 uint8_t N_ctx_rung[512];
110 uint8_t nw_pred_rung[256];
111 uint8_t ne_pred_rung[256];
112 uint8_t prev_row_rung[14];
113 uint8_t runlen_zeroes[14];
116 uint32_t stack[EPIC_PIX_STACK_SIZE];
120 typedef struct JPGContext {
121 BlockDSPContext bdsp;
125 VLC dc_vlc[2], ac_vlc[2];
127 DECLARE_ALIGNED(32, int16_t, block)[6][64];
132 typedef struct G2MContext {
139 int width, height, bpp;
140 int orig_width, orig_height;
141 int tile_width, tile_height;
142 int tiles_x, tiles_y, tile_x, tile_y;
147 int framebuf_stride, old_width, old_height;
149 uint8_t *synth_tile, *jpeg_tile, *epic_buf, *epic_buf_base;
150 int tile_stride, epic_buf_stride, old_tile_w, old_tile_h;
153 uint8_t *kempf_buf, *kempf_flags;
158 int cursor_w, cursor_h, cursor_x, cursor_y;
159 int cursor_hot_x, cursor_hot_y;
162 static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
163 const uint8_t *val_table, int nb_codes,
166 uint8_t huff_size[256] = { 0 };
167 uint16_t huff_code[256];
168 uint16_t huff_sym[256];
171 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
173 for (i = 0; i < 256; i++)
174 huff_sym[i] = i + 16 * is_ac;
177 huff_sym[0] = 16 * 256;
179 return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
180 huff_code, 2, 2, huff_sym, 2, 2, 0);
183 static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
187 ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance,
188 avpriv_mjpeg_val_dc, 12, 0);
191 ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance,
192 avpriv_mjpeg_val_dc, 12, 0);
195 ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance,
196 avpriv_mjpeg_val_ac_luminance, 251, 1);
199 ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance,
200 avpriv_mjpeg_val_ac_chrominance, 251, 1);
204 ff_blockdsp_init(&c->bdsp, avctx);
205 ff_idctdsp_init(&c->idsp, avctx);
206 ff_init_scantable(c->idsp.idct_permutation, &c->scantable,
212 static av_cold void jpg_free_context(JPGContext *ctx)
216 for (i = 0; i < 2; i++) {
217 ff_free_vlc(&ctx->dc_vlc[i]);
218 ff_free_vlc(&ctx->ac_vlc[i]);
224 static void jpg_unescape(const uint8_t *src, int src_size,
225 uint8_t *dst, int *dst_size)
227 const uint8_t *src_end = src + src_size;
228 uint8_t *dst_start = dst;
230 while (src < src_end) {
235 if (x == 0xFF && !*src)
238 *dst_size = dst - dst_start;
241 static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
242 int plane, int16_t *block)
245 const int is_chroma = !!plane;
246 const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
248 if (get_bits_left(gb) < 1)
249 return AVERROR_INVALIDDATA;
251 c->bdsp.clear_block(block);
252 dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 2);
254 return AVERROR_INVALIDDATA;
256 dc = get_xbits(gb, dc);
257 dc = dc * qmat[0] + c->prev_dc[plane];
259 c->prev_dc[plane] = dc;
263 val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 2);
265 return AVERROR_INVALIDDATA;
269 return val ? AVERROR_INVALIDDATA : 0;
273 val = get_xbits(gb, nbits);
274 val *= qmat[ff_zigzag_direct[pos]];
275 block[c->scantable.permutated[pos]] = val;
281 static inline void yuv2rgb(uint8_t *out, int ridx, int Y, int U, int V)
283 out[ridx] = av_clip_uint8(Y + (91881 * V + 32768 >> 16));
284 out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
285 out[2 - ridx] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
288 static int jpg_decode_data(JPGContext *c, int width, int height,
289 const uint8_t *src, int src_size,
290 uint8_t *dst, int dst_stride,
291 const uint8_t *mask, int mask_stride, int num_mbs,
295 int mb_w, mb_h, mb_x, mb_y, i, j;
299 const int ridx = swapuv ? 2 : 0;
301 if ((ret = av_reallocp(&c->buf,
302 src_size + AV_INPUT_BUFFER_PADDING_SIZE)) < 0)
304 jpg_unescape(src, src_size, c->buf, &unesc_size);
305 memset(c->buf + unesc_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
306 if((ret = init_get_bits8(&gb, c->buf, unesc_size)) < 0)
309 width = FFALIGN(width, 16);
311 mb_h = (height + 15) >> 4;
314 num_mbs = mb_w * mb_h * 4;
316 for (i = 0; i < 3; i++)
317 c->prev_dc[i] = 1024;
320 c->bdsp.clear_blocks(c->block[0]);
321 for (mb_y = 0; mb_y < mb_h; mb_y++) {
322 for (mb_x = 0; mb_x < mb_w; mb_x++) {
323 if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
324 !mask[mb_x * 2 + mask_stride] &&
325 !mask[mb_x * 2 + 1 + mask_stride]) {
329 for (j = 0; j < 2; j++) {
330 for (i = 0; i < 2; i++) {
331 if (mask && !mask[mb_x * 2 + i + j * mask_stride])
334 if ((ret = jpg_decode_block(c, &gb, 0,
335 c->block[i + j * 2])) != 0)
337 c->idsp.idct(c->block[i + j * 2]);
340 for (i = 1; i < 3; i++) {
341 if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
343 c->idsp.idct(c->block[i + 3]);
346 for (j = 0; j < 16; j++) {
347 uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
348 for (i = 0; i < 16; i++) {
351 Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
352 U = c->block[4][(i >> 1) + (j >> 1) * 8] - 128;
353 V = c->block[5][(i >> 1) + (j >> 1) * 8] - 128;
354 yuv2rgb(out + i * 3, ridx, Y, U, V);
365 mask += mask_stride * 2;
371 #define LOAD_NEIGHBOURS(x) \
372 W = curr_row[(x) - 1]; \
373 N = above_row[(x)]; \
374 WW = curr_row[(x) - 2]; \
375 NW = above_row[(x) - 1]; \
376 NE = above_row[(x) + 1]; \
377 NN = above2_row[(x)]; \
378 NNW = above2_row[(x) - 1]; \
379 NWW = above_row[(x) - 2]; \
380 NNE = above2_row[(x) + 1]
382 #define UPDATE_NEIGHBOURS(x) \
388 NE = above_row[(x) + 1]; \
389 NNE = above2_row[(x) + 1]
395 /* improved djb2 hash from http://www.cse.yorku.ca/~oz/hash.html */
396 static int djb2_hash(uint32_t key)
400 h = (h * 33) ^ ((key >> 24) & 0xFF); // xxx: probably not needed at all
401 h = (h * 33) ^ ((key >> 16) & 0xFF);
402 h = (h * 33) ^ ((key >> 8) & 0xFF);
403 h = (h * 33) ^ (key & 0xFF);
405 return h & (EPIC_HASH_SIZE - 1);
408 static void epic_hash_init(ePICPixHash *hash)
410 memset(hash, 0, sizeof(*hash));
413 static ePICPixHashElem *epic_hash_find(const ePICPixHash *hash, uint32_t key)
415 int i, idx = djb2_hash(key);
416 ePICPixHashElem *bucket = hash->bucket[idx];
418 for (i = 0; i < hash->bucket_fill[idx]; i++)
419 if (bucket[i].pix_id == key)
425 static ePICPixHashElem *epic_hash_add(ePICPixHash *hash, uint32_t key)
427 ePICPixHashElem *bucket, *ret;
428 int idx = djb2_hash(key);
430 if (hash->bucket_size[idx] > INT_MAX / sizeof(**hash->bucket))
433 if (!(hash->bucket_fill[idx] < hash->bucket_size[idx])) {
434 int new_size = hash->bucket_size[idx] + 16;
435 bucket = av_realloc(hash->bucket[idx], new_size * sizeof(*bucket));
438 hash->bucket[idx] = bucket;
439 hash->bucket_size[idx] = new_size;
442 ret = &hash->bucket[idx][hash->bucket_fill[idx]++];
443 memset(ret, 0, sizeof(*ret));
448 static int epic_add_pixel_to_cache(ePICPixHash *hash, uint32_t key, uint32_t pix)
450 ePICPixListElem *new_elem;
451 ePICPixHashElem *hash_elem = epic_hash_find(hash, key);
454 if (!(hash_elem = epic_hash_add(hash, key)))
455 return AVERROR(ENOMEM);
458 new_elem = av_mallocz(sizeof(*new_elem));
460 return AVERROR(ENOMEM);
462 new_elem->pixel = pix;
463 new_elem->next = hash_elem->list;
464 hash_elem->list = new_elem;
469 static inline int epic_cache_entries_for_pixel(const ePICPixHash *hash,
472 ePICPixHashElem *hash_elem = epic_hash_find(hash, pix);
474 if (hash_elem != NULL && hash_elem->list != NULL)
480 static void epic_free_pixel_cache(ePICPixHash *hash)
484 for (i = 0; i < EPIC_HASH_SIZE; i++) {
485 for (j = 0; j < hash->bucket_fill[i]; j++) {
486 ePICPixListElem *list_elem = hash->bucket[i][j].list;
488 ePICPixListElem *tmp = list_elem->next;
493 av_freep(&hash->bucket[i]);
494 hash->bucket_size[i] =
495 hash->bucket_fill[i] = 0;
499 static inline int is_pixel_on_stack(const ePICContext *dc, uint32_t pix)
503 for (i = 0; i < dc->stack_pos; i++)
504 if (dc->stack[i] == pix)
507 return i != dc->stack_pos;
510 #define TOSIGNED(val) (((val) >> 1) ^ -((val) & 1))
512 static inline int epic_decode_component_pred(ePICContext *dc,
513 int N, int W, int NW)
515 unsigned delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
516 return mid_pred(N, N + W - NW, W) - TOSIGNED(delta);
519 static uint32_t epic_decode_pixel_pred(ePICContext *dc, int x, int y,
520 const uint32_t *curr_row,
521 const uint32_t *above_row)
523 uint32_t N, W, NW, pred;
525 int GN, GW, GNW, R, G, B;
530 NW = above_row[x - 1];
532 GN = (N >> G_shift) & 0xFF;
533 GW = (W >> G_shift) & 0xFF;
534 GNW = (NW >> G_shift) & 0xFF;
536 G = epic_decode_component_pred(dc, GN, GW, GNW);
538 R = G + epic_decode_component_pred(dc,
539 ((N >> R_shift) & 0xFF) - GN,
540 ((W >> R_shift) & 0xFF) - GW,
541 ((NW >> R_shift) & 0xFF) - GNW);
543 B = G + epic_decode_component_pred(dc,
544 ((N >> B_shift) & 0xFF) - GN,
545 ((W >> B_shift) & 0xFF) - GW,
546 ((NW >> B_shift) & 0xFF) - GNW);
549 pred = curr_row[x - 1];
553 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
554 R = ((pred >> R_shift) & 0xFF) - TOSIGNED(delta);
556 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
557 G = ((pred >> G_shift) & 0xFF) - TOSIGNED(delta);
559 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
560 B = ((pred >> B_shift) & 0xFF) - TOSIGNED(delta);
563 if (R<0 || G<0 || B<0 || R > 255 || G > 255 || B > 255) {
564 avpriv_request_sample(NULL, "RGB %d %d %d (out of range)", R, G, B);
568 return (R << R_shift) | (G << G_shift) | (B << B_shift);
571 static int epic_predict_pixel(ePICContext *dc, uint8_t *rung,
572 uint32_t *pPix, uint32_t pix)
574 if (!ff_els_decode_bit(&dc->els_ctx, rung)) {
578 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
582 static int epic_handle_edges(ePICContext *dc, int x, int y,
583 const uint32_t *curr_row,
584 const uint32_t *above_row, uint32_t *pPix)
588 if (!x && !y) { /* special case: top-left pixel */
589 /* the top-left pixel is coded independently with 3 unsigned numbers */
590 *pPix = (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << R_shift) |
591 (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << G_shift) |
592 (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << B_shift);
596 if (x) { /* predict from W first */
597 pix = curr_row[x - 1];
598 if (epic_predict_pixel(dc, &dc->W_flag_rung, pPix, pix))
602 if (y) { /* then try to predict from N */
604 if (!dc->stack_pos || dc->stack[0] != pix) {
605 if (epic_predict_pixel(dc, &dc->N_flag_rung, pPix, pix))
613 static int epic_decode_run_length(ePICContext *dc, int x, int y, int tile_width,
614 const uint32_t *curr_row,
615 const uint32_t *above_row,
616 const uint32_t *above2_row,
617 uint32_t *pPix, int *pRun)
619 int idx, got_pixel = 0, WWneW, old_WWneW = 0;
620 uint32_t W, WW, N, NN, NW, NE, NWW, NNW, NNE;
626 if (dc->next_run_pos == x) {
627 /* can't reuse W for the new pixel in this case */
630 idx = (WW != W) << 7 |
638 WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
644 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = W;
652 if (got_pixel) // pixel value already known (derived from either W or N)
654 else { // pixel value is unknown and will be decoded later
655 NWneW = *pRun ? NWneW : NW != W;
657 /* TODO: RFC this mess! */
658 switch (((NW != N) << 2) | (NWneW << 1) | WWneW) {
660 break; // do nothing here
665 if (!is_pixel_on_stack(dc, N)) {
667 (*pRun ? old_WWneW : WW != W) << 7 |
675 if (!ff_els_decode_bit(&dc->els_ctx, &dc->N_ctx_rung[idx])) {
686 if (!is_pixel_on_stack(dc, N))
687 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = N;
692 if (x + *pRun >= tile_width - 1)
695 UPDATE_NEIGHBOURS(x + *pRun);
697 if (!NWneW && NW == N && N == NE) {
699 int start_pos = x + *pRun;
701 /* scan for a run of pix in the line above */
702 uint32_t pix = above_row[start_pos + 1];
703 for (pos = start_pos + 2; pos < tile_width; pos++)
704 if (!(above_row[pos] == pix))
706 run = pos - start_pos - 1;
707 idx = av_ceil_log2(run);
708 if (ff_els_decode_bit(&dc->els_ctx, &dc->prev_row_rung[idx]))
712 /* run-length is coded as plain binary number of idx - 1 bits */
713 for (pos = idx - 1, rle = 0, flag = 0; pos >= 0; pos--) {
714 if ((1 << pos) + rle < run &&
715 ff_els_decode_bit(&dc->els_ctx,
716 flag ? &dc->runlen_one
717 : &dc->runlen_zeroes[pos])) {
723 break; // return immediately
725 if (x + *pRun >= tile_width - 1)
728 LOAD_NEIGHBOURS(x + *pRun);
741 WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
744 dc->next_run_pos = x + *pRun;
748 static int epic_predict_pixel2(ePICContext *dc, uint8_t *rung,
749 uint32_t *pPix, uint32_t pix)
751 if (ff_els_decode_bit(&dc->els_ctx, rung)) {
755 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
759 static int epic_predict_from_NW_NE(ePICContext *dc, int x, int y, int run,
760 int tile_width, const uint32_t *curr_row,
761 const uint32_t *above_row, uint32_t *pPix)
765 /* try to reuse the NW pixel first */
767 uint32_t NW = above_row[x - 1];
768 if (NW != curr_row[x - 1] && NW != above_row[x] && !is_pixel_on_stack(dc, NW)) {
769 if (epic_predict_pixel2(dc, &dc->nw_pred_rung[NW & 0xFF], pPix, NW))
774 /* try to reuse the NE[x + run, y] pixel */
776 if (pos < tile_width - 1 && y) {
777 uint32_t NE = above_row[pos + 1];
778 if (NE != above_row[pos] && !is_pixel_on_stack(dc, NE)) {
779 if (epic_predict_pixel2(dc, &dc->ne_pred_rung[NE & 0xFF], pPix, NE))
787 static int epic_decode_from_cache(ePICContext *dc, uint32_t W, uint32_t *pPix)
789 ePICPixListElem *list, *prev = NULL;
790 ePICPixHashElem *hash_elem = epic_hash_find(&dc->hash, W);
792 if (!hash_elem || !hash_elem->list)
795 list = hash_elem->list;
797 if (!is_pixel_on_stack(dc, list->pixel)) {
798 if (ff_els_decode_bit(&dc->els_ctx, &list->rung)) {
800 if (list != hash_elem->list) {
801 prev->next = list->next;
802 list->next = hash_elem->list;
803 hash_elem->list = list;
807 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = list->pixel;
816 static int epic_decode_tile(ePICContext *dc, uint8_t *out, int tile_height,
817 int tile_width, int stride)
821 uint32_t *curr_row = NULL, *above_row = NULL, *above2_row;
823 for (y = 0; y < tile_height; y++, out += stride) {
824 above2_row = above_row;
825 above_row = curr_row;
826 curr_row = (uint32_t *) out;
828 for (x = 0, dc->next_run_pos = 0; x < tile_width;) {
830 return AVERROR_INVALIDDATA; // bail out in the case of ELS overflow
832 pix = curr_row[x - 1]; // get W pixel
834 if (y >= 1 && x >= 2 &&
835 pix != curr_row[x - 2] && pix != above_row[x - 1] &&
836 pix != above_row[x - 2] && pix != above_row[x] &&
837 !epic_cache_entries_for_pixel(&dc->hash, pix)) {
838 curr_row[x] = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
842 dc->stack_pos = 0; // empty stack
844 if (y < 2 || x < 2 || x == tile_width - 1) {
846 got_pixel = epic_handle_edges(dc, x, y, curr_row, above_row, &pix);
848 got_pixel = epic_decode_run_length(dc, x, y, tile_width,
850 above2_row, &pix, &run);
855 if (!got_pixel && !epic_predict_from_NW_NE(dc, x, y, run,
856 tile_width, curr_row,
858 uint32_t ref_pix = curr_row[x - 1];
859 if (!x || !epic_decode_from_cache(dc, ref_pix, &pix)) {
860 pix = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
861 if (is_pixel_on_stack(dc, pix))
862 return AVERROR_INVALIDDATA;
865 int ret = epic_add_pixel_to_cache(&dc->hash,
873 for (; run > 0; x++, run--)
882 static int epic_jb_decode_tile(G2MContext *c, int tile_x, int tile_y,
883 const uint8_t *src, size_t src_size,
884 AVCodecContext *avctx)
886 uint8_t prefix, mask = 0x80;
887 int extrabytes, tile_width, tile_height, awidth, aheight;
894 /* get data size of the ELS partition as unsigned variable-length integer */
897 for (extrabytes = 0; (prefix & mask) && (extrabytes < 7); extrabytes++)
899 if (extrabytes > 3 || src_size < extrabytes) {
900 av_log(avctx, AV_LOG_ERROR, "ePIC: invalid data size VLI\n");
901 return AVERROR_INVALIDDATA;
904 els_dsize = prefix & ((0x80 >> extrabytes) - 1); // mask out the length prefix
905 while (extrabytes-- > 0) {
906 els_dsize = (els_dsize << 8) | *src++;
910 if (src_size < els_dsize) {
911 av_log(avctx, AV_LOG_ERROR, "ePIC: data too short, needed %"SIZE_SPECIFIER", got %"SIZE_SPECIFIER"\n",
912 els_dsize, src_size);
913 return AVERROR_INVALIDDATA;
916 tile_width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
917 tile_height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
918 awidth = FFALIGN(tile_width, 16);
919 aheight = FFALIGN(tile_height, 16);
921 if (tile_width > (1 << FF_ARRAY_ELEMS(c->ec.prev_row_rung))) {
922 avpriv_request_sample(avctx, "large tile width");
923 return AVERROR_INVALIDDATA;
928 uint8_t tr_r, tr_g, tr_b, *buf;
930 /* ELS decoder initializations */
931 memset(&c->ec, 0, sizeof(c->ec));
932 ff_els_decoder_init(&c->ec.els_ctx, src, els_dsize);
933 epic_hash_init(&c->ec.hash);
935 /* decode transparent pixel value */
936 tr_r = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
937 tr_g = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
938 tr_b = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
939 if (c->ec.els_ctx.err != 0) {
940 av_log(avctx, AV_LOG_ERROR,
941 "ePIC: couldn't decode transparency pixel!\n");
942 ff_els_decoder_uninit(&c->ec.unsigned_rung);
943 return AVERROR_INVALIDDATA;
946 ret = epic_decode_tile(&c->ec, c->epic_buf, tile_height, tile_width,
949 epic_free_pixel_cache(&c->ec.hash);
950 ff_els_decoder_uninit(&c->ec.unsigned_rung);
953 av_log(avctx, AV_LOG_ERROR,
954 "ePIC: tile decoding failed, frame=%d, tile_x=%d, tile_y=%d\n",
955 avctx->frame_number, tile_x, tile_y);
956 return AVERROR_INVALIDDATA;
960 dst = c->framebuf + tile_x * c->tile_width * 3 +
961 tile_y * c->tile_height * c->framebuf_stride;
963 for (j = 0; j < tile_height; j++) {
965 in = (uint32_t *) buf;
966 for (i = 0; i < tile_width; i++) {
967 out[0] = (in[i] >> R_shift) & 0xFF;
968 out[1] = (in[i] >> G_shift) & 0xFF;
969 out[2] = (in[i] >> B_shift) & 0xFF;
972 buf += c->epic_buf_stride;
973 dst += c->framebuf_stride;
976 if (src_size > els_dsize) {
979 int bstride = FFALIGN(tile_width, 16) >> 3;
981 int estride = c->epic_buf_stride >> 2;
984 src_size -= els_dsize;
986 in = (uint32_t *) c->epic_buf;
987 tr = (tr_r << R_shift) | (tr_g << G_shift) | (tr_b << B_shift);
989 memset(c->kempf_flags, 0,
990 (aheight >> 3) * bstride * sizeof(*c->kempf_flags));
991 for (j = 0; j < tile_height; j += 8) {
992 for (i = 0; i < tile_width; i += 8) {
993 c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 0;
994 for (k = 0; k < 8 * 8; k++) {
995 if (in[i + (k & 7) + (k >> 3) * estride] == tr) {
996 c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 1;
1005 memset(c->jpeg_tile, 0, c->tile_stride * aheight);
1006 jpg_decode_data(&c->jc, awidth, aheight, src, src_size,
1007 c->jpeg_tile, c->tile_stride,
1008 c->kempf_flags, bstride, nblocks, c->swapuv);
1010 in = (uint32_t *) c->epic_buf;
1011 dst = c->framebuf + tile_x * c->tile_width * 3 +
1012 tile_y * c->tile_height * c->framebuf_stride;
1014 for (j = 0; j < tile_height; j++) {
1015 for (i = 0; i < tile_width; i++)
1017 memcpy(dst + i * 3, jpg + i * 3, 3);
1018 in += c->epic_buf_stride >> 2;
1019 dst += c->framebuf_stride;
1020 jpg += c->tile_stride;
1024 dst = c->framebuf + tile_x * c->tile_width * 3 +
1025 tile_y * c->tile_height * c->framebuf_stride;
1026 return jpg_decode_data(&c->jc, tile_width, tile_height, src, src_size,
1027 dst, c->framebuf_stride, NULL, 0, 0, c->swapuv);
1033 static int kempf_restore_buf(const uint8_t *src, int len,
1034 uint8_t *dst, int stride,
1035 const uint8_t *jpeg_tile, int tile_stride,
1036 int width, int height,
1037 const uint8_t *pal, int npal, int tidx)
1042 int align_width = FFALIGN(width, 16);
1044 if ((ret = init_get_bits8(&gb, src, len)) < 0)
1047 if (npal <= 2) nb = 1;
1048 else if (npal <= 4) nb = 2;
1049 else if (npal <= 16) nb = 4;
1052 for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) {
1053 if (get_bits(&gb, 8))
1055 for (i = 0; i < width; i++) {
1056 col = get_bits(&gb, nb);
1058 memcpy(dst + i * 3, pal + col * 3, 3);
1060 memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
1062 skip_bits_long(&gb, nb * (align_width - width));
1068 static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
1069 const uint8_t *src, int src_size)
1072 int hdr, zsize, npal, tidx = -1, ret;
1074 const uint8_t *src_end = src + src_size;
1075 uint8_t pal[768], transp[3];
1076 uLongf dlen = (c->tile_width + 1) * c->tile_height;
1078 int nblocks, cblocks, bstride;
1079 int bits, bitbuf, coded;
1080 uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
1081 tile_y * c->tile_height * c->framebuf_stride;
1084 return AVERROR_INVALIDDATA;
1086 width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
1087 height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
1090 sub_type = hdr >> 5;
1091 if (sub_type == 0) {
1093 memcpy(transp, src, 3);
1095 for (j = 0; j < height; j++, dst += c->framebuf_stride)
1096 for (i = 0; i < width; i++)
1097 memcpy(dst + i * 3, transp, 3);
1099 } else if (sub_type == 1) {
1100 return jpg_decode_data(&c->jc, width, height, src, src_end - src,
1101 dst, c->framebuf_stride, NULL, 0, 0, 0);
1104 if (sub_type != 2) {
1105 memcpy(transp, src, 3);
1109 if (src_end - src < npal * 3)
1110 return AVERROR_INVALIDDATA;
1111 memcpy(pal, src, npal * 3);
1113 if (sub_type != 2) {
1114 for (i = 0; i < npal; i++) {
1115 if (!memcmp(pal + i * 3, transp, 3)) {
1122 if (src_end - src < 2)
1124 zsize = (src[0] << 8) | src[1];
1127 if (src_end - src < zsize + (sub_type != 2))
1128 return AVERROR_INVALIDDATA;
1130 ret = uncompress(c->kempf_buf, &dlen, src, zsize);
1132 return AVERROR_INVALIDDATA;
1135 if (sub_type == 2) {
1136 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1137 NULL, 0, width, height, pal, npal, tidx);
1141 nblocks = *src++ + 1;
1143 bstride = FFALIGN(width, 16) >> 3;
1144 // blocks are coded LSB and we need normal bitreader for JPEG data
1146 for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
1147 for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
1150 return AVERROR_INVALIDDATA;
1158 if (cblocks > nblocks)
1159 return AVERROR_INVALIDDATA;
1160 c->kempf_flags[j * 2 + i * 2 * bstride] =
1161 c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
1162 c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
1163 c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
1167 memset(c->jpeg_tile, 0, c->tile_stride * height);
1168 jpg_decode_data(&c->jc, width, height, src, src_end - src,
1169 c->jpeg_tile, c->tile_stride,
1170 c->kempf_flags, bstride, nblocks * 4, 0);
1172 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1173 c->jpeg_tile, c->tile_stride,
1174 width, height, pal, npal, tidx);
1179 static int g2m_init_buffers(G2MContext *c)
1183 if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
1184 c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3;
1185 aligned_height = c->height + 15;
1186 av_free(c->framebuf);
1187 c->framebuf = av_mallocz_array(c->framebuf_stride, aligned_height);
1189 return AVERROR(ENOMEM);
1191 if (!c->synth_tile || !c->jpeg_tile ||
1192 (c->compression == 2 && !c->epic_buf_base) ||
1193 c->old_tile_w < c->tile_width ||
1194 c->old_tile_h < c->tile_height) {
1195 c->tile_stride = FFALIGN(c->tile_width, 16) * 3;
1196 c->epic_buf_stride = FFALIGN(c->tile_width * 4, 16);
1197 aligned_height = FFALIGN(c->tile_height, 16);
1198 av_freep(&c->synth_tile);
1199 av_freep(&c->jpeg_tile);
1200 av_freep(&c->kempf_buf);
1201 av_freep(&c->kempf_flags);
1202 av_freep(&c->epic_buf_base);
1204 c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
1205 c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
1206 c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height +
1207 AV_INPUT_BUFFER_PADDING_SIZE);
1208 c->kempf_flags = av_mallocz(c->tile_width * aligned_height);
1209 if (!c->synth_tile || !c->jpeg_tile ||
1210 !c->kempf_buf || !c->kempf_flags)
1211 return AVERROR(ENOMEM);
1212 if (c->compression == 2) {
1213 c->epic_buf_base = av_mallocz(c->epic_buf_stride * aligned_height + 4);
1214 if (!c->epic_buf_base)
1215 return AVERROR(ENOMEM);
1216 c->epic_buf = c->epic_buf_base + 4;
1223 static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
1229 uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
1230 uint32_t cursor_hot_x, cursor_hot_y;
1231 int cursor_fmt, err;
1233 cur_size = bytestream2_get_be32(gb);
1234 cursor_w = bytestream2_get_byte(gb);
1235 cursor_h = bytestream2_get_byte(gb);
1236 cursor_hot_x = bytestream2_get_byte(gb);
1237 cursor_hot_y = bytestream2_get_byte(gb);
1238 cursor_fmt = bytestream2_get_byte(gb);
1240 cursor_stride = FFALIGN(cursor_w, cursor_fmt==1 ? 32 : 1) * 4;
1242 if (cursor_w < 1 || cursor_w > 256 ||
1243 cursor_h < 1 || cursor_h > 256) {
1244 av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %"PRIu32"x%"PRIu32"\n",
1245 cursor_w, cursor_h);
1246 return AVERROR_INVALIDDATA;
1248 if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
1249 av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %"PRIu32",%"PRIu32"\n",
1250 cursor_hot_x, cursor_hot_y);
1251 cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
1252 cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
1254 if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
1255 c->cursor_w * c->cursor_h / 4 > cur_size) {
1256 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"/%u\n",
1257 cur_size, bytestream2_get_bytes_left(gb));
1258 return AVERROR_INVALIDDATA;
1260 if (cursor_fmt != 1 && cursor_fmt != 32) {
1261 avpriv_report_missing_feature(avctx, "Cursor format %d",
1263 return AVERROR_PATCHWELCOME;
1266 if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) {
1267 av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
1271 c->cursor_w = cursor_w;
1272 c->cursor_h = cursor_h;
1273 c->cursor_hot_x = cursor_hot_x;
1274 c->cursor_hot_y = cursor_hot_y;
1275 c->cursor_fmt = cursor_fmt;
1276 c->cursor_stride = cursor_stride;
1279 switch (c->cursor_fmt) {
1280 case 1: // old monochrome
1281 for (j = 0; j < c->cursor_h; j++) {
1282 for (i = 0; i < c->cursor_w; i += 32) {
1283 bits = bytestream2_get_be32(gb);
1284 for (k = 0; k < 32; k++) {
1285 dst[0] = !!(bits & 0x80000000);
1293 for (j = 0; j < c->cursor_h; j++) {
1294 for (i = 0; i < c->cursor_w; i += 32) {
1295 bits = bytestream2_get_be32(gb);
1296 for (k = 0; k < 32; k++) {
1297 int mask_bit = !!(bits & 0x80000000);
1298 switch (dst[0] * 2 + mask_bit) {
1323 case 32: // full colour
1324 /* skip monochrome version of the cursor and decode RGBA instead */
1325 bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
1326 for (j = 0; j < c->cursor_h; j++) {
1327 for (i = 0; i < c->cursor_w; i++) {
1328 int val = bytestream2_get_be32(gb);
1337 return AVERROR_PATCHWELCOME;
1342 #define APPLY_ALPHA(src, new, alpha) \
1343 src = (src * (256 - alpha) + new * alpha) >> 8
1345 static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
1349 const uint8_t *cursor;
1354 x = c->cursor_x - c->cursor_hot_x;
1355 y = c->cursor_y - c->cursor_hot_y;
1361 if (x + w > c->width)
1363 if (y + h > c->height)
1377 cursor += -y * c->cursor_stride;
1382 for (j = 0; j < h; j++) {
1383 for (i = 0; i < w; i++) {
1384 uint8_t alpha = cursor[i * 4];
1385 APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
1386 APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
1387 APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
1390 cursor += c->cursor_stride;
1394 static int g2m_decode_frame(AVCodecContext *avctx, void *data,
1395 int *got_picture_ptr, AVPacket *avpkt)
1397 const uint8_t *buf = avpkt->data;
1398 int buf_size = avpkt->size;
1399 G2MContext *c = avctx->priv_data;
1400 AVFrame *pic = data;
1401 GetByteContext bc, tbc;
1404 uint32_t chunk_size, r_mask, g_mask, b_mask;
1405 int chunk_type, chunk_start;
1409 if (buf_size < 12) {
1410 av_log(avctx, AV_LOG_ERROR,
1411 "Frame should have at least 12 bytes, got %d instead\n",
1413 return AVERROR_INVALIDDATA;
1416 bytestream2_init(&bc, buf, buf_size);
1418 magic = bytestream2_get_be32(&bc);
1419 if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
1420 (magic & 0xF) < 2 || (magic & 0xF) > 5) {
1421 av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
1422 return AVERROR_INVALIDDATA;
1425 c->swapuv = magic == MKBETAG('G', '2', 'M', '2');
1427 while (bytestream2_get_bytes_left(&bc) > 5) {
1428 chunk_size = bytestream2_get_le32(&bc) - 1;
1429 chunk_type = bytestream2_get_byte(&bc);
1430 chunk_start = bytestream2_tell(&bc);
1431 if (chunk_size > bytestream2_get_bytes_left(&bc)) {
1432 av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %"PRIu32" type %02X\n",
1433 chunk_size, chunk_type);
1436 switch (chunk_type) {
1440 if (chunk_size < 21) {
1441 av_log(avctx, AV_LOG_ERROR, "Invalid display info size %"PRIu32"\n",
1445 c->width = bytestream2_get_be32(&bc);
1446 c->height = bytestream2_get_be32(&bc);
1447 if (c->width < 16 || c->height < 16) {
1448 av_log(avctx, AV_LOG_ERROR,
1449 "Invalid frame dimensions %dx%d\n",
1450 c->width, c->height);
1451 ret = AVERROR_INVALIDDATA;
1454 if (c->width != avctx->width || c->height != avctx->height) {
1455 ret = ff_set_dimensions(avctx, c->width, c->height);
1459 c->compression = bytestream2_get_be32(&bc);
1460 if (c->compression != 2 && c->compression != 3) {
1461 avpriv_report_missing_feature(avctx, "Compression method %d",
1463 ret = AVERROR_PATCHWELCOME;
1466 c->tile_width = bytestream2_get_be32(&bc);
1467 c->tile_height = bytestream2_get_be32(&bc);
1468 if (c->tile_width <= 0 || c->tile_height <= 0 ||
1469 ((c->tile_width | c->tile_height) & 0xF) ||
1470 c->tile_width * (uint64_t)c->tile_height >= INT_MAX / 4 ||
1471 av_image_check_size2(c->tile_width, c->tile_height, avctx->max_pixels, avctx->pix_fmt, 0, avctx) < 0
1473 av_log(avctx, AV_LOG_ERROR,
1474 "Invalid tile dimensions %dx%d\n",
1475 c->tile_width, c->tile_height);
1476 ret = AVERROR_INVALIDDATA;
1479 c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
1480 c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
1481 c->bpp = bytestream2_get_byte(&bc);
1483 if (bytestream2_get_bytes_left(&bc) < 16 ||
1484 (chunk_size - 21) < 16) {
1485 av_log(avctx, AV_LOG_ERROR,
1486 "Display info: missing bitmasks!\n");
1487 ret = AVERROR_INVALIDDATA;
1490 r_mask = bytestream2_get_be32(&bc);
1491 g_mask = bytestream2_get_be32(&bc);
1492 b_mask = bytestream2_get_be32(&bc);
1493 if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) {
1494 avpriv_report_missing_feature(avctx,
1495 "Bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32,
1496 r_mask, g_mask, b_mask);
1497 ret = AVERROR_PATCHWELCOME;
1501 avpriv_request_sample(avctx, "bpp=%d", c->bpp);
1502 ret = AVERROR_PATCHWELCOME;
1505 if (g2m_init_buffers(c)) {
1506 ret = AVERROR(ENOMEM);
1512 if (!c->tiles_x || !c->tiles_y) {
1513 av_log(avctx, AV_LOG_WARNING,
1514 "No display info - skipping tile\n");
1517 if (chunk_size < 2) {
1518 av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %"PRIu32"\n",
1522 c->tile_x = bytestream2_get_byte(&bc);
1523 c->tile_y = bytestream2_get_byte(&bc);
1524 if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
1525 av_log(avctx, AV_LOG_ERROR,
1526 "Invalid tile pos %d,%d (in %dx%d grid)\n",
1527 c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
1531 switch (c->compression) {
1532 case COMPR_EPIC_J_B:
1533 ret = epic_jb_decode_tile(c, c->tile_x, c->tile_y,
1534 buf + bytestream2_tell(&bc),
1535 chunk_size - 2, avctx);
1537 case COMPR_KEMPF_J_B:
1538 ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
1539 buf + bytestream2_tell(&bc),
1543 if (ret && c->framebuf)
1544 av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
1545 c->tile_x, c->tile_y);
1548 if (chunk_size < 5) {
1549 av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n",
1553 c->cursor_x = bytestream2_get_be16(&bc);
1554 c->cursor_y = bytestream2_get_be16(&bc);
1557 if (chunk_size < 8) {
1558 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n",
1562 bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
1564 g2m_load_cursor(avctx, c, &tbc);
1570 av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02d\n",
1574 /* navigate to next chunk */
1575 bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
1580 if (c->width && c->height && c->framebuf) {
1581 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
1584 pic->key_frame = got_header;
1585 pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
1587 for (i = 0; i < avctx->height; i++)
1588 memcpy(pic->data[0] + i * pic->linesize[0],
1589 c->framebuf + i * c->framebuf_stride,
1591 g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
1593 *got_picture_ptr = 1;
1608 static av_cold int g2m_decode_init(AVCodecContext *avctx)
1610 G2MContext *const c = avctx->priv_data;
1613 if ((ret = jpg_init(avctx, &c->jc)) != 0) {
1614 av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
1615 jpg_free_context(&c->jc);
1616 return AVERROR(ENOMEM);
1619 avctx->pix_fmt = AV_PIX_FMT_RGB24;
1621 // store original sizes and check against those if resize happens
1622 c->orig_width = avctx->width;
1623 c->orig_height = avctx->height;
1628 static av_cold int g2m_decode_end(AVCodecContext *avctx)
1630 G2MContext *const c = avctx->priv_data;
1632 jpg_free_context(&c->jc);
1634 av_freep(&c->epic_buf_base);
1636 av_freep(&c->kempf_buf);
1637 av_freep(&c->kempf_flags);
1638 av_freep(&c->synth_tile);
1639 av_freep(&c->jpeg_tile);
1640 av_freep(&c->cursor);
1641 av_freep(&c->framebuf);
1646 AVCodec ff_g2m_decoder = {
1648 .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
1649 .type = AVMEDIA_TYPE_VIDEO,
1650 .id = AV_CODEC_ID_G2M,
1651 .priv_data_size = sizeof(G2MContext),
1652 .init = g2m_decode_init,
1653 .close = g2m_decode_end,
1654 .decode = g2m_decode_frame,
1655 .capabilities = AV_CODEC_CAP_DR1,
1656 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,