3 * Copyright (c) 2012 Konstantin Shishkov
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include "libavutil/intreadwrite.h"
31 #include "bytestream.h"
51 static const uint8_t luma_quant[64] = {
52 8, 6, 5, 8, 12, 20, 26, 31,
53 6, 6, 7, 10, 13, 29, 30, 28,
54 7, 7, 8, 12, 20, 29, 35, 28,
55 7, 9, 11, 15, 26, 44, 40, 31,
56 9, 11, 19, 28, 34, 55, 52, 39,
57 12, 18, 28, 32, 41, 52, 57, 46,
58 25, 32, 39, 44, 52, 61, 60, 51,
59 36, 46, 48, 49, 56, 50, 52, 50
62 static const uint8_t chroma_quant[64] = {
63 9, 9, 12, 24, 50, 50, 50, 50,
64 9, 11, 13, 33, 50, 50, 50, 50,
65 12, 13, 28, 50, 50, 50, 50, 50,
66 24, 33, 50, 50, 50, 50, 50, 50,
67 50, 50, 50, 50, 50, 50, 50, 50,
68 50, 50, 50, 50, 50, 50, 50, 50,
69 50, 50, 50, 50, 50, 50, 50, 50,
70 50, 50, 50, 50, 50, 50, 50, 50,
73 typedef struct JPGContext {
77 VLC dc_vlc[2], ac_vlc[2];
79 DECLARE_ALIGNED(16, int16_t, block)[6][64];
84 typedef struct G2MContext {
89 int width, height, bpp;
90 int tile_width, tile_height;
91 int tiles_x, tiles_y, tile_x, tile_y;
96 int framebuf_stride, old_width, old_height;
98 uint8_t *synth_tile, *jpeg_tile;
99 int tile_stride, old_tile_w, old_tile_h;
101 uint8_t *kempf_buf, *kempf_flags;
106 int cursor_w, cursor_h, cursor_x, cursor_y;
107 int cursor_hot_x, cursor_hot_y;
110 static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
111 const uint8_t *val_table, int nb_codes,
114 uint8_t huff_size[256] = { 0 };
115 uint16_t huff_code[256];
116 uint16_t huff_sym[256];
119 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
121 for (i = 0; i < 256; i++)
122 huff_sym[i] = i + 16 * is_ac;
125 huff_sym[0] = 16 * 256;
127 return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
128 huff_code, 2, 2, huff_sym, 2, 2, 0);
131 static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
135 ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance,
136 avpriv_mjpeg_val_dc, 12, 0);
139 ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance,
140 avpriv_mjpeg_val_dc, 12, 0);
143 ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance,
144 avpriv_mjpeg_val_ac_luminance, 251, 1);
147 ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance,
148 avpriv_mjpeg_val_ac_chrominance, 251, 1);
152 ff_dsputil_init(&c->dsp, avctx);
153 ff_init_scantable(c->dsp.idct_permutation, &c->scantable,
159 static av_cold void jpg_free_context(JPGContext *ctx)
163 for (i = 0; i < 2; i++) {
164 ff_free_vlc(&ctx->dc_vlc[i]);
165 ff_free_vlc(&ctx->ac_vlc[i]);
171 static void jpg_unescape(const uint8_t *src, int src_size,
172 uint8_t *dst, int *dst_size)
174 const uint8_t *src_end = src + src_size;
175 uint8_t *dst_start = dst;
177 while (src < src_end) {
182 if (x == 0xFF && !*src)
185 *dst_size = dst - dst_start;
188 static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
189 int plane, int16_t *block)
192 const int is_chroma = !!plane;
193 const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
195 c->dsp.clear_block(block);
196 dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3);
198 return AVERROR_INVALIDDATA;
200 dc = get_xbits(gb, dc);
201 dc = dc * qmat[0] + c->prev_dc[plane];
203 c->prev_dc[plane] = dc;
207 val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3);
209 return AVERROR_INVALIDDATA;
213 return val ? AVERROR_INVALIDDATA : 0;
217 val = get_xbits(gb, nbits);
218 val *= qmat[ff_zigzag_direct[pos]];
219 block[c->scantable.permutated[pos]] = val;
225 static inline void yuv2rgb(uint8_t *out, int Y, int U, int V)
227 out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16));
228 out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
229 out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
232 static int jpg_decode_data(JPGContext *c, int width, int height,
233 const uint8_t *src, int src_size,
234 uint8_t *dst, int dst_stride,
235 const uint8_t *mask, int mask_stride, int num_mbs,
240 int mb_w, mb_h, mb_x, mb_y, i, j;
245 tmp = av_realloc(c->buf, src_size + FF_INPUT_BUFFER_PADDING_SIZE);
247 return AVERROR(ENOMEM);
249 jpg_unescape(src, src_size, c->buf, &unesc_size);
250 memset(c->buf + unesc_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
251 init_get_bits(&gb, c->buf, unesc_size * 8);
253 width = FFALIGN(width, 16);
255 mb_h = (height + 15) >> 4;
258 num_mbs = mb_w * mb_h;
260 for (i = 0; i < 3; i++)
261 c->prev_dc[i] = 1024;
263 for (mb_y = 0; mb_y < mb_h; mb_y++) {
264 for (mb_x = 0; mb_x < mb_w; mb_x++) {
265 if (mask && !mask[mb_x]) {
269 for (j = 0; j < 2; j++) {
270 for (i = 0; i < 2; i++) {
271 if ((ret = jpg_decode_block(c, &gb, 0,
272 c->block[i + j * 2])) != 0)
274 c->dsp.idct(c->block[i + j * 2]);
277 for (i = 1; i < 3; i++) {
278 if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
280 c->dsp.idct(c->block[i + 3]);
283 for (j = 0; j < 16; j++) {
284 uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
285 for (i = 0; i < 16; i++) {
288 Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
289 U = c->block[4 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
290 V = c->block[5 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
291 yuv2rgb(out + i * 3, Y, U, V);
308 static void kempf_restore_buf(const uint8_t *src, int len,
309 uint8_t *dst, int stride,
310 const uint8_t *jpeg_tile, int tile_stride,
311 int width, int height,
312 const uint8_t *pal, int npal, int tidx)
317 init_get_bits(&gb, src, len * 8);
319 if (npal <= 2) nb = 1;
320 else if (npal <= 4) nb = 2;
321 else if (npal <= 16) nb = 4;
324 for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) {
325 if (get_bits(&gb, 8))
327 for (i = 0; i < width; i++) {
328 col = get_bits(&gb, nb);
330 memcpy(dst + i * 3, pal + col * 3, 3);
332 memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
337 static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
338 const uint8_t *src, int src_size)
341 int hdr, zsize, npal, tidx = -1, ret;
343 const uint8_t *src_end = src + src_size;
344 uint8_t pal[768], transp[3];
345 uLongf dlen = (c->tile_width + 1) * c->tile_height;
347 int nblocks, cblocks, bstride;
348 int bits, bitbuf, coded;
349 uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
350 tile_y * c->tile_height * c->framebuf_stride;
353 return AVERROR_INVALIDDATA;
355 width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
356 height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
362 memcpy(transp, src, 3);
364 for (j = 0; j < height; j++, dst += c->framebuf_stride)
365 for (i = 0; i < width; i++)
366 memcpy(dst + i * 3, transp, 3);
368 } else if (sub_type == 1) {
369 return jpg_decode_data(&c->jc, width, height, src, src_end - src,
370 dst, c->framebuf_stride, NULL, 0, 0, 0);
374 memcpy(transp, src, 3);
378 memcpy(pal, src, npal * 3); src += npal * 3;
380 for (i = 0; i < npal; i++) {
381 if (!memcmp(pal + i * 3, transp, 3)) {
388 if (src_end - src < 2)
390 zsize = (src[0] << 8) | src[1]; src += 2;
392 if (src_end - src < zsize + (sub_type != 2))
393 return AVERROR_INVALIDDATA;
395 ret = uncompress(c->kempf_buf, &dlen, src, zsize);
397 return AVERROR_INVALIDDATA;
401 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
402 NULL, 0, width, height, pal, npal, tidx);
406 nblocks = *src++ + 1;
408 bstride = FFALIGN(width, 16) >> 4;
409 // blocks are coded LSB and we need normal bitreader for JPEG data
411 for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
412 for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
415 return AVERROR_INVALIDDATA;
423 if (cblocks > nblocks)
424 return AVERROR_INVALIDDATA;
425 c->kempf_flags[j + i * bstride] = coded;
429 memset(c->jpeg_tile, 0, c->tile_stride * height);
430 jpg_decode_data(&c->jc, width, height, src, src_end - src,
431 c->jpeg_tile, c->tile_stride,
432 c->kempf_flags, bstride, nblocks, 0);
434 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
435 c->jpeg_tile, c->tile_stride,
436 width, height, pal, npal, tidx);
441 static int g2m_init_buffers(G2MContext *c)
445 if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
446 c->framebuf_stride = FFALIGN(c->width * 3, 16);
447 aligned_height = FFALIGN(c->height, 16);
448 av_free(c->framebuf);
449 c->framebuf = av_mallocz(c->framebuf_stride * aligned_height);
451 return AVERROR(ENOMEM);
453 if (!c->synth_tile || !c->jpeg_tile ||
454 c->old_tile_w < c->tile_width ||
455 c->old_tile_h < c->tile_height) {
456 c->tile_stride = FFALIGN(c->tile_width * 3, 16);
457 aligned_height = FFALIGN(c->tile_height, 16);
458 av_free(c->synth_tile);
459 av_free(c->jpeg_tile);
460 av_free(c->kempf_buf);
461 av_free(c->kempf_flags);
462 c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
463 c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
464 c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height
465 + FF_INPUT_BUFFER_PADDING_SIZE);
466 c->kempf_flags = av_mallocz( c->tile_width * aligned_height);
467 if (!c->synth_tile || !c->jpeg_tile ||
468 !c->kempf_buf || !c->kempf_flags)
469 return AVERROR(ENOMEM);
475 static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
481 uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
482 uint32_t cursor_hot_x, cursor_hot_y;
486 cur_size = bytestream2_get_be32(gb);
487 cursor_w = bytestream2_get_byte(gb);
488 cursor_h = bytestream2_get_byte(gb);
489 cursor_hot_x = bytestream2_get_byte(gb);
490 cursor_hot_y = bytestream2_get_byte(gb);
491 cursor_fmt = bytestream2_get_byte(gb);
493 cursor_stride = cursor_w * 4;
495 if (cursor_w < 1 || cursor_w > 256 ||
496 cursor_h < 1 || cursor_h > 256) {
497 av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %dx%d\n",
499 return AVERROR_INVALIDDATA;
501 if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
502 av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %d,%d\n",
503 cursor_hot_x, cursor_hot_y);
504 cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
505 cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
507 if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
508 c->cursor_w * c->cursor_h / 4 > cur_size) {
509 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %d/%d\n",
510 cur_size, bytestream2_get_bytes_left(gb));
511 return AVERROR_INVALIDDATA;
513 if (cursor_fmt != 1 && cursor_fmt != 32) {
514 avpriv_report_missing_feature(avctx, "Cursor format %d",
516 return AVERROR_PATCHWELCOME;
519 if (cursor_fmt == 1 && cursor_w % 32) {
520 avpriv_report_missing_feature(avctx, "odd monochrome cursor width %d", cursor_w);
521 return AVERROR_PATCHWELCOME;
524 tmp = av_realloc(c->cursor, cursor_stride * cursor_h);
526 av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
527 return AVERROR(ENOMEM);
531 c->cursor_w = cursor_w;
532 c->cursor_h = cursor_h;
533 c->cursor_hot_x = cursor_hot_x;
534 c->cursor_hot_y = cursor_hot_y;
535 c->cursor_fmt = cursor_fmt;
536 c->cursor_stride = cursor_stride;
539 switch (c->cursor_fmt) {
540 case 1: // old monochrome
541 for (j = 0; j < c->cursor_h; j++) {
542 for (i = 0; i < c->cursor_w; i += 32) {
543 bits = bytestream2_get_be32(gb);
544 for (k = 0; k < 32; k++) {
545 dst[0] = !!(bits & 0x80000000);
553 for (j = 0; j < c->cursor_h; j++) {
554 for (i = 0; i < c->cursor_w; i += 32) {
555 bits = bytestream2_get_be32(gb);
556 for (k = 0; k < 32; k++) {
557 int mask_bit = !!(bits & 0x80000000);
558 switch (dst[0] * 2 + mask_bit) {
560 dst[0] = 0xFF; dst[1] = 0x00;
561 dst[2] = 0x00; dst[3] = 0x00;
564 dst[0] = 0xFF; dst[1] = 0xFF;
565 dst[2] = 0xFF; dst[3] = 0xFF;
568 dst[0] = 0x00; dst[1] = 0x00;
569 dst[2] = 0x00; dst[3] = 0x00;
577 case 32: // full colour
578 /* skip monochrome version of the cursor and decode RGBA instead */
579 bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
580 for (j = 0; j < c->cursor_h; j++) {
581 for (i = 0; i < c->cursor_w; i++) {
582 int val = bytestream2_get_be32(gb);
591 return AVERROR_PATCHWELCOME;
596 #define APPLY_ALPHA(src, new, alpha) \
597 src = (src * (256 - alpha) + new * alpha) >> 8
599 static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
603 const uint8_t *cursor;
608 x = c->cursor_x - c->cursor_hot_x;
609 y = c->cursor_y - c->cursor_hot_y;
615 if (x + w > c->width)
617 if (y + h > c->height)
627 cursor += -y * c->cursor_stride;
634 for (j = 0; j < h; j++) {
635 for (i = 0; i < w; i++) {
636 uint8_t alpha = cursor[i * 4];
637 APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
638 APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
639 APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
642 cursor += c->cursor_stride;
646 static int g2m_decode_frame(AVCodecContext *avctx, void *data,
647 int *got_picture_ptr, AVPacket *avpkt)
649 const uint8_t *buf = avpkt->data;
650 int buf_size = avpkt->size;
651 G2MContext *c = avctx->priv_data;
653 GetByteContext bc, tbc;
662 av_log(avctx, AV_LOG_ERROR,
663 "Frame should have at least 12 bytes, got %d instead\n",
665 return AVERROR_INVALIDDATA;
668 bytestream2_init(&bc, buf, buf_size);
670 magic = bytestream2_get_be32(&bc);
671 if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
672 (magic & 0xF) < 2 || (magic & 0xF) > 4) {
673 av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
674 return AVERROR_INVALIDDATA;
677 if ((magic & 0xF) != 4) {
678 av_log(avctx, AV_LOG_ERROR, "G2M2 and G2M3 are not yet supported\n");
679 return AVERROR(ENOSYS);
682 while (bytestream2_get_bytes_left(&bc) > 5) {
683 chunk_size = bytestream2_get_le32(&bc) - 1;
684 chunk_type = bytestream2_get_byte(&bc);
685 if (chunk_size > bytestream2_get_bytes_left(&bc)) {
686 av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %d type %02X\n",
687 chunk_size, chunk_type);
690 switch (chunk_type) {
693 if (chunk_size < 21) {
694 av_log(avctx, AV_LOG_ERROR, "Invalid frame info size %d\n",
698 c->width = bytestream2_get_be32(&bc);
699 c->height = bytestream2_get_be32(&bc);
700 if (c->width < 16 || c->width > avctx->width ||
701 c->height < 16 || c->height > avctx->height) {
702 av_log(avctx, AV_LOG_ERROR,
703 "Invalid frame dimensions %dx%d\n",
704 c->width, c->height);
705 ret = AVERROR_INVALIDDATA;
708 if (c->width != avctx->width || c->height != avctx->height)
709 avcodec_set_dimensions(avctx, c->width, c->height);
710 c->compression = bytestream2_get_be32(&bc);
711 if (c->compression != 2 && c->compression != 3) {
712 av_log(avctx, AV_LOG_ERROR,
713 "Unknown compression method %d\n",
715 return AVERROR_PATCHWELCOME;
717 c->tile_width = bytestream2_get_be32(&bc);
718 c->tile_height = bytestream2_get_be32(&bc);
719 if (!c->tile_width || !c->tile_height) {
720 av_log(avctx, AV_LOG_ERROR,
721 "Invalid tile dimensions %dx%d\n",
722 c->tile_width, c->tile_height);
723 ret = AVERROR_INVALIDDATA;
726 c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
727 c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
728 c->bpp = bytestream2_get_byte(&bc);
730 bytestream2_skip(&bc, chunk_size);
731 if (g2m_init_buffers(c)) {
732 ret = AVERROR(ENOMEM);
738 if (!c->tiles_x || !c->tiles_y) {
739 av_log(avctx, AV_LOG_WARNING,
740 "No frame header - skipping tile\n");
741 bytestream2_skip(&bc, bytestream2_get_bytes_left(&bc));
744 if (chunk_size < 2) {
745 av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %d\n",
749 c->tile_x = bytestream2_get_byte(&bc);
750 c->tile_y = bytestream2_get_byte(&bc);
751 if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
752 av_log(avctx, AV_LOG_ERROR,
753 "Invalid tile pos %d,%d (in %dx%d grid)\n",
754 c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
759 switch (c->compression) {
761 av_log(avctx, AV_LOG_ERROR,
762 "ePIC j-b compression is not implemented yet\n");
763 return AVERROR(ENOSYS);
764 case COMPR_KEMPF_J_B:
765 ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
766 buf + bytestream2_tell(&bc),
770 if (ret && c->framebuf)
771 av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
772 c->tile_x, c->tile_y);
773 bytestream2_skip(&bc, chunk_size);
776 if (chunk_size < 5) {
777 av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %d\n",
781 c->cursor_x = bytestream2_get_be16(&bc);
782 c->cursor_y = bytestream2_get_be16(&bc);
783 bytestream2_skip(&bc, chunk_size - 4);
786 if (chunk_size < 8) {
787 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %d\n",
791 bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
793 g2m_load_cursor(avctx, c, &tbc);
794 bytestream2_skip(&bc, chunk_size);
798 bytestream2_skip(&bc, chunk_size);
801 av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02X\n",
803 bytestream2_skip(&bc, chunk_size);
809 if (c->width && c->height && c->framebuf) {
810 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) {
811 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
815 pic->key_frame = got_header;
816 pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
818 for (i = 0; i < avctx->height; i++)
819 memcpy(pic->data[0] + i * pic->linesize[0],
820 c->framebuf + i * c->framebuf_stride,
822 g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
824 *got_picture_ptr = 1;
829 c->width = c->height = 0;
830 c->tiles_x = c->tiles_y = 0;
834 static av_cold int g2m_decode_init(AVCodecContext *avctx)
836 G2MContext * const c = avctx->priv_data;
839 if ((ret = jpg_init(avctx, &c->jc)) != 0) {
840 av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
841 jpg_free_context(&c->jc);
842 return AVERROR(ENOMEM);
845 avctx->pix_fmt = AV_PIX_FMT_RGB24;
850 static av_cold int g2m_decode_end(AVCodecContext *avctx)
852 G2MContext * const c = avctx->priv_data;
854 jpg_free_context(&c->jc);
856 av_freep(&c->kempf_buf);
857 av_freep(&c->kempf_flags);
858 av_freep(&c->synth_tile);
859 av_freep(&c->jpeg_tile);
860 av_freep(&c->cursor);
861 av_freep(&c->framebuf);
866 AVCodec ff_g2m_decoder = {
868 .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
869 .type = AVMEDIA_TYPE_VIDEO,
870 .id = AV_CODEC_ID_G2M,
871 .priv_data_size = sizeof(G2MContext),
872 .init = g2m_decode_init,
873 .close = g2m_decode_end,
874 .decode = g2m_decode_frame,
875 .capabilities = CODEC_CAP_DR1,