3 * Copyright (c) 2012 Konstantin Shishkov
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 #include "libavutil/intreadwrite.h"
33 #include "bytestream.h"
37 #include "jpegtables.h"
54 static const uint8_t luma_quant[64] = {
55 8, 6, 5, 8, 12, 20, 26, 31,
56 6, 6, 7, 10, 13, 29, 30, 28,
57 7, 7, 8, 12, 20, 29, 35, 28,
58 7, 9, 11, 15, 26, 44, 40, 31,
59 9, 11, 19, 28, 34, 55, 52, 39,
60 12, 18, 28, 32, 41, 52, 57, 46,
61 25, 32, 39, 44, 52, 61, 60, 51,
62 36, 46, 48, 49, 56, 50, 52, 50
65 static const uint8_t chroma_quant[64] = {
66 9, 9, 12, 24, 50, 50, 50, 50,
67 9, 11, 13, 33, 50, 50, 50, 50,
68 12, 13, 28, 50, 50, 50, 50, 50,
69 24, 33, 50, 50, 50, 50, 50, 50,
70 50, 50, 50, 50, 50, 50, 50, 50,
71 50, 50, 50, 50, 50, 50, 50, 50,
72 50, 50, 50, 50, 50, 50, 50, 50,
73 50, 50, 50, 50, 50, 50, 50, 50,
76 typedef struct JPGContext {
81 VLC dc_vlc[2], ac_vlc[2];
83 DECLARE_ALIGNED(16, int16_t, block)[6][64];
88 typedef struct G2MContext {
93 int width, height, bpp;
94 int orig_width, orig_height;
95 int tile_width, tile_height;
96 int tiles_x, tiles_y, tile_x, tile_y;
101 int framebuf_stride, old_width, old_height;
103 uint8_t *synth_tile, *jpeg_tile;
104 int tile_stride, old_tile_w, old_tile_h;
106 uint8_t *kempf_buf, *kempf_flags;
111 int cursor_w, cursor_h, cursor_x, cursor_y;
112 int cursor_hot_x, cursor_hot_y;
115 static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
116 const uint8_t *val_table, int nb_codes,
119 uint8_t huff_size[256] = { 0 };
120 uint16_t huff_code[256];
121 uint16_t huff_sym[256];
124 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
126 for (i = 0; i < 256; i++)
127 huff_sym[i] = i + 16 * is_ac;
130 huff_sym[0] = 16 * 256;
132 return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
133 huff_code, 2, 2, huff_sym, 2, 2, 0);
136 static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
140 ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance,
141 avpriv_mjpeg_val_dc, 12, 0);
144 ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance,
145 avpriv_mjpeg_val_dc, 12, 0);
148 ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance,
149 avpriv_mjpeg_val_ac_luminance, 251, 1);
152 ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance,
153 avpriv_mjpeg_val_ac_chrominance, 251, 1);
157 ff_blockdsp_init(&c->bdsp, avctx);
158 ff_idctdsp_init(&c->idsp, avctx);
159 ff_init_scantable(c->idsp.idct_permutation, &c->scantable,
165 static av_cold void jpg_free_context(JPGContext *ctx)
169 for (i = 0; i < 2; i++) {
170 ff_free_vlc(&ctx->dc_vlc[i]);
171 ff_free_vlc(&ctx->ac_vlc[i]);
177 static void jpg_unescape(const uint8_t *src, int src_size,
178 uint8_t *dst, int *dst_size)
180 const uint8_t *src_end = src + src_size;
181 uint8_t *dst_start = dst;
183 while (src < src_end) {
188 if (x == 0xFF && !*src)
191 *dst_size = dst - dst_start;
194 static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
195 int plane, int16_t *block)
198 const int is_chroma = !!plane;
199 const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
201 c->bdsp.clear_block(block);
202 dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3);
204 return AVERROR_INVALIDDATA;
206 dc = get_xbits(gb, dc);
207 dc = dc * qmat[0] + c->prev_dc[plane];
209 c->prev_dc[plane] = dc;
213 val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3);
215 return AVERROR_INVALIDDATA;
219 return val ? AVERROR_INVALIDDATA : 0;
223 val = get_xbits(gb, nbits);
224 val *= qmat[ff_zigzag_direct[pos]];
225 block[c->scantable.permutated[pos]] = val;
231 static inline void yuv2rgb(uint8_t *out, int Y, int U, int V)
233 out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16));
234 out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
235 out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
238 static int jpg_decode_data(JPGContext *c, int width, int height,
239 const uint8_t *src, int src_size,
240 uint8_t *dst, int dst_stride,
241 const uint8_t *mask, int mask_stride, int num_mbs,
245 int mb_w, mb_h, mb_x, mb_y, i, j;
250 if ((ret = av_reallocp(&c->buf,
251 src_size + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
253 jpg_unescape(src, src_size, c->buf, &unesc_size);
254 memset(c->buf + unesc_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
255 init_get_bits(&gb, c->buf, unesc_size * 8);
257 width = FFALIGN(width, 16);
259 mb_h = (height + 15) >> 4;
262 num_mbs = mb_w * mb_h * 4;
264 for (i = 0; i < 3; i++)
265 c->prev_dc[i] = 1024;
267 c->bdsp.clear_blocks(c->block[0]);
268 for (mb_y = 0; mb_y < mb_h; mb_y++) {
269 for (mb_x = 0; mb_x < mb_w; mb_x++) {
270 if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
271 !mask[mb_x * 2 + mask_stride] &&
272 !mask[mb_x * 2 + 1 + mask_stride]) {
276 for (j = 0; j < 2; j++) {
277 for (i = 0; i < 2; i++) {
278 if (mask && !mask[mb_x * 2 + i + j * mask_stride])
281 if ((ret = jpg_decode_block(c, &gb, 0,
282 c->block[i + j * 2])) != 0)
284 c->idsp.idct(c->block[i + j * 2]);
287 for (i = 1; i < 3; i++) {
288 if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
290 c->idsp.idct(c->block[i + 3]);
293 for (j = 0; j < 16; j++) {
294 uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
295 for (i = 0; i < 16; i++) {
298 Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
299 U = c->block[4 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
300 V = c->block[5 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
301 yuv2rgb(out + i * 3, Y, U, V);
312 mask += mask_stride * 2;
318 static void kempf_restore_buf(const uint8_t *src, int len,
319 uint8_t *dst, int stride,
320 const uint8_t *jpeg_tile, int tile_stride,
321 int width, int height,
322 const uint8_t *pal, int npal, int tidx)
327 init_get_bits(&gb, src, len * 8);
329 if (npal <= 2) nb = 1;
330 else if (npal <= 4) nb = 2;
331 else if (npal <= 16) nb = 4;
334 for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) {
335 if (get_bits(&gb, 8))
337 for (i = 0; i < width; i++) {
338 col = get_bits(&gb, nb);
340 memcpy(dst + i * 3, pal + col * 3, 3);
342 memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
347 static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
348 const uint8_t *src, int src_size)
351 int hdr, zsize, npal, tidx = -1, ret;
353 const uint8_t *src_end = src + src_size;
354 uint8_t pal[768], transp[3];
355 uLongf dlen = (c->tile_width + 1) * c->tile_height;
357 int nblocks, cblocks, bstride;
358 int bits, bitbuf, coded;
359 uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
360 tile_y * c->tile_height * c->framebuf_stride;
363 return AVERROR_INVALIDDATA;
365 width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
366 height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
372 memcpy(transp, src, 3);
374 for (j = 0; j < height; j++, dst += c->framebuf_stride)
375 for (i = 0; i < width; i++)
376 memcpy(dst + i * 3, transp, 3);
378 } else if (sub_type == 1) {
379 return jpg_decode_data(&c->jc, width, height, src, src_end - src,
380 dst, c->framebuf_stride, NULL, 0, 0, 0);
384 memcpy(transp, src, 3);
388 memcpy(pal, src, npal * 3);
391 for (i = 0; i < npal; i++) {
392 if (!memcmp(pal + i * 3, transp, 3)) {
399 if (src_end - src < 2)
401 zsize = (src[0] << 8) | src[1];
404 if (src_end - src < zsize)
405 return AVERROR_INVALIDDATA;
407 ret = uncompress(c->kempf_buf, &dlen, src, zsize);
409 return AVERROR_INVALIDDATA;
413 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
414 NULL, 0, width, height, pal, npal, tidx);
418 nblocks = *src++ + 1;
420 bstride = FFALIGN(width, 16) >> 3;
421 // blocks are coded LSB and we need normal bitreader for JPEG data
423 for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
424 for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
433 if (cblocks > nblocks)
434 return AVERROR_INVALIDDATA;
435 c->kempf_flags[j * 2 + i * 2 * bstride] =
436 c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
437 c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
438 c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
442 memset(c->jpeg_tile, 0, c->tile_stride * height);
443 jpg_decode_data(&c->jc, width, height, src, src_end - src,
444 c->jpeg_tile, c->tile_stride,
445 c->kempf_flags, bstride, nblocks * 4, 0);
447 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
448 c->jpeg_tile, c->tile_stride,
449 width, height, pal, npal, tidx);
454 static int g2m_init_buffers(G2MContext *c)
458 if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
459 c->framebuf_stride = FFALIGN(c->width * 3, 16);
460 aligned_height = FFALIGN(c->height, 16);
461 av_free(c->framebuf);
462 c->framebuf = av_mallocz(c->framebuf_stride * aligned_height);
464 return AVERROR(ENOMEM);
466 if (!c->synth_tile || !c->jpeg_tile ||
467 c->old_tile_w < c->tile_width ||
468 c->old_tile_h < c->tile_height) {
469 c->tile_stride = FFALIGN(c->tile_width * 3, 16);
470 aligned_height = FFALIGN(c->tile_height, 16);
471 av_free(c->synth_tile);
472 av_free(c->jpeg_tile);
473 av_free(c->kempf_buf);
474 av_free(c->kempf_flags);
475 c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
476 c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
477 c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height
478 + FF_INPUT_BUFFER_PADDING_SIZE);
479 c->kempf_flags = av_mallocz( c->tile_width * aligned_height);
480 if (!c->synth_tile || !c->jpeg_tile ||
481 !c->kempf_buf || !c->kempf_flags)
482 return AVERROR(ENOMEM);
488 static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
494 uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
495 uint32_t cursor_hot_x, cursor_hot_y;
498 cur_size = bytestream2_get_be32(gb);
499 cursor_w = bytestream2_get_byte(gb);
500 cursor_h = bytestream2_get_byte(gb);
501 cursor_hot_x = bytestream2_get_byte(gb);
502 cursor_hot_y = bytestream2_get_byte(gb);
503 cursor_fmt = bytestream2_get_byte(gb);
505 cursor_stride = FFALIGN(cursor_w, 32) * 4;
507 if (cursor_w < 1 || cursor_w > 256 ||
508 cursor_h < 1 || cursor_h > 256) {
509 av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %"PRIu32"x%"PRIu32"\n",
511 return AVERROR_INVALIDDATA;
513 if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
514 av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %"PRIu32",%"PRIu32"\n",
515 cursor_hot_x, cursor_hot_y);
516 cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
517 cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
519 if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
520 c->cursor_w * c->cursor_h / 4 > cur_size) {
521 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"/%u\n",
522 cur_size, bytestream2_get_bytes_left(gb));
523 return AVERROR_INVALIDDATA;
525 if (cursor_fmt != 1 && cursor_fmt != 32) {
526 avpriv_report_missing_feature(avctx, "Cursor format %d",
528 return AVERROR_PATCHWELCOME;
531 if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) {
532 av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
536 c->cursor_w = cursor_w;
537 c->cursor_h = cursor_h;
538 c->cursor_hot_x = cursor_hot_x;
539 c->cursor_hot_y = cursor_hot_y;
540 c->cursor_fmt = cursor_fmt;
541 c->cursor_stride = cursor_stride;
544 switch (c->cursor_fmt) {
545 case 1: // old monochrome
546 for (j = 0; j < c->cursor_h; j++) {
547 for (i = 0; i < c->cursor_w; i += 32) {
548 bits = bytestream2_get_be32(gb);
549 for (k = 0; k < 32; k++) {
550 dst[0] = !!(bits & 0x80000000);
555 dst += c->cursor_stride - c->cursor_w * 4;
559 for (j = 0; j < c->cursor_h; j++) {
560 for (i = 0; i < c->cursor_w; i += 32) {
561 bits = bytestream2_get_be32(gb);
562 for (k = 0; k < 32; k++) {
563 int mask_bit = !!(bits & 0x80000000);
564 switch (dst[0] * 2 + mask_bit) {
587 dst += c->cursor_stride - c->cursor_w * 4;
590 case 32: // full colour
591 /* skip monochrome version of the cursor and decode RGBA instead */
592 bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
593 for (j = 0; j < c->cursor_h; j++) {
594 for (i = 0; i < c->cursor_w; i++) {
595 int val = bytestream2_get_be32(gb);
601 dst += c->cursor_stride - c->cursor_w * 4;
605 return AVERROR_PATCHWELCOME;
610 #define APPLY_ALPHA(src, new, alpha) \
611 src = (src * (256 - alpha) + new * alpha) >> 8
613 static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
617 const uint8_t *cursor;
622 x = c->cursor_x - c->cursor_hot_x;
623 y = c->cursor_y - c->cursor_hot_y;
629 if (x + w > c->width)
631 if (y + h > c->height)
641 cursor += -y * c->cursor_stride;
648 for (j = 0; j < h; j++) {
649 for (i = 0; i < w; i++) {
650 uint8_t alpha = cursor[i * 4];
651 APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
652 APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
653 APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
656 cursor += c->cursor_stride;
660 static int g2m_decode_frame(AVCodecContext *avctx, void *data,
661 int *got_picture_ptr, AVPacket *avpkt)
663 const uint8_t *buf = avpkt->data;
664 int buf_size = avpkt->size;
665 G2MContext *c = avctx->priv_data;
667 GetByteContext bc, tbc;
670 uint32_t chunk_size, r_mask, g_mask, b_mask;
671 int chunk_type, chunk_start;
676 av_log(avctx, AV_LOG_ERROR,
677 "Frame should have at least 12 bytes, got %d instead\n",
679 return AVERROR_INVALIDDATA;
682 bytestream2_init(&bc, buf, buf_size);
684 magic = bytestream2_get_be32(&bc);
685 if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
686 (magic & 0xF) < 2 || (magic & 0xF) > 4) {
687 av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
688 return AVERROR_INVALIDDATA;
691 if ((magic & 0xF) != 4) {
692 av_log(avctx, AV_LOG_ERROR, "G2M2 and G2M3 are not yet supported\n");
693 return AVERROR(ENOSYS);
696 while (bytestream2_get_bytes_left(&bc) > 5) {
697 chunk_size = bytestream2_get_le32(&bc) - 1;
698 chunk_type = bytestream2_get_byte(&bc);
699 chunk_start = bytestream2_tell(&bc);
700 if (chunk_size > bytestream2_get_bytes_left(&bc)) {
701 av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %"PRIu32" type %02X\n",
702 chunk_size, chunk_type);
705 switch (chunk_type) {
708 if (chunk_size < 21) {
709 av_log(avctx, AV_LOG_ERROR, "Invalid display info size %"PRIu32"\n",
713 c->width = bytestream2_get_be32(&bc);
714 c->height = bytestream2_get_be32(&bc);
715 if (c->width < 16 || c->width > c->orig_width ||
716 c->height < 16 || c->height > c->orig_height) {
717 av_log(avctx, AV_LOG_ERROR,
718 "Invalid frame dimensions %dx%d\n",
719 c->width, c->height);
720 ret = AVERROR_INVALIDDATA;
723 if (c->width != avctx->width || c->height != avctx->height) {
724 ret = ff_set_dimensions(avctx, c->width, c->height);
728 c->compression = bytestream2_get_be32(&bc);
729 if (c->compression != 2 && c->compression != 3) {
730 av_log(avctx, AV_LOG_ERROR,
731 "Unknown compression method %d\n",
733 return AVERROR_PATCHWELCOME;
735 c->tile_width = bytestream2_get_be32(&bc);
736 c->tile_height = bytestream2_get_be32(&bc);
737 if (!c->tile_width || !c->tile_height ||
738 ((c->tile_width | c->tile_height) & 0xF)) {
739 av_log(avctx, AV_LOG_ERROR,
740 "Invalid tile dimensions %dx%d\n",
741 c->tile_width, c->tile_height);
742 ret = AVERROR_INVALIDDATA;
745 c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
746 c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
747 c->bpp = bytestream2_get_byte(&bc);
749 if (bytestream2_get_bytes_left(&bc) < 16 ||
750 (chunk_size - 21) < 16) {
751 av_log(avctx, AV_LOG_ERROR,
752 "Display info: missing bitmasks!\n");
753 return AVERROR_INVALIDDATA;
755 r_mask = bytestream2_get_be32(&bc);
756 g_mask = bytestream2_get_be32(&bc);
757 b_mask = bytestream2_get_be32(&bc);
758 if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) {
759 av_log(avctx, AV_LOG_ERROR,
760 "Invalid or unsupported bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32"\n",
761 r_mask, g_mask, b_mask);
762 return AVERROR_PATCHWELCOME;
765 avpriv_request_sample(avctx, "bpp=%d", c->bpp);
766 return AVERROR_PATCHWELCOME;
768 if (g2m_init_buffers(c)) {
769 ret = AVERROR(ENOMEM);
775 if (!c->tiles_x || !c->tiles_y) {
776 av_log(avctx, AV_LOG_WARNING,
777 "No display info - skipping tile\n");
780 if (chunk_size < 2) {
781 av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %"PRIu32"\n",
785 c->tile_x = bytestream2_get_byte(&bc);
786 c->tile_y = bytestream2_get_byte(&bc);
787 if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
788 av_log(avctx, AV_LOG_ERROR,
789 "Invalid tile pos %d,%d (in %dx%d grid)\n",
790 c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
794 switch (c->compression) {
796 av_log(avctx, AV_LOG_ERROR,
797 "ePIC j-b compression is not implemented yet\n");
798 return AVERROR(ENOSYS);
799 case COMPR_KEMPF_J_B:
800 ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
801 buf + bytestream2_tell(&bc),
805 if (ret && c->framebuf)
806 av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
807 c->tile_x, c->tile_y);
810 if (chunk_size < 5) {
811 av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n",
815 c->cursor_x = bytestream2_get_be16(&bc);
816 c->cursor_y = bytestream2_get_be16(&bc);
819 if (chunk_size < 8) {
820 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n",
824 bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
826 g2m_load_cursor(avctx, c, &tbc);
832 av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02d\n",
836 /* navigate to next chunk */
837 bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
842 if (c->width && c->height) {
843 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) {
844 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
848 pic->key_frame = got_header;
849 pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
851 for (i = 0; i < avctx->height; i++)
852 memcpy(pic->data[0] + i * pic->linesize[0],
853 c->framebuf + i * c->framebuf_stride,
855 g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
857 *got_picture_ptr = 1;
870 static av_cold int g2m_decode_init(AVCodecContext *avctx)
872 G2MContext *const c = avctx->priv_data;
875 if ((ret = jpg_init(avctx, &c->jc)) != 0) {
876 av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
877 jpg_free_context(&c->jc);
878 return AVERROR(ENOMEM);
881 avctx->pix_fmt = AV_PIX_FMT_RGB24;
883 // store original sizes and check against those if resize happens
884 c->orig_width = avctx->width;
885 c->orig_height = avctx->height;
890 static av_cold int g2m_decode_end(AVCodecContext *avctx)
892 G2MContext *const c = avctx->priv_data;
894 jpg_free_context(&c->jc);
896 av_freep(&c->kempf_buf);
897 av_freep(&c->kempf_flags);
898 av_freep(&c->synth_tile);
899 av_freep(&c->jpeg_tile);
900 av_freep(&c->cursor);
901 av_freep(&c->framebuf);
906 AVCodec ff_g2m_decoder = {
908 .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
909 .type = AVMEDIA_TYPE_VIDEO,
910 .id = AV_CODEC_ID_G2M,
911 .priv_data_size = sizeof(G2MContext),
912 .init = g2m_decode_init,
913 .close = g2m_decode_end,
914 .decode = g2m_decode_frame,
915 .capabilities = CODEC_CAP_DR1,