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
30 #include "libavutil/intreadwrite.h"
33 #include "bytestream.h"
53 static const uint8_t luma_quant[64] = {
54 8, 6, 5, 8, 12, 20, 26, 31,
55 6, 6, 7, 10, 13, 29, 30, 28,
56 7, 7, 8, 12, 20, 29, 35, 28,
57 7, 9, 11, 15, 26, 44, 40, 31,
58 9, 11, 19, 28, 34, 55, 52, 39,
59 12, 18, 28, 32, 41, 52, 57, 46,
60 25, 32, 39, 44, 52, 61, 60, 51,
61 36, 46, 48, 49, 56, 50, 52, 50
64 static const uint8_t chroma_quant[64] = {
65 9, 9, 12, 24, 50, 50, 50, 50,
66 9, 11, 13, 33, 50, 50, 50, 50,
67 12, 13, 28, 50, 50, 50, 50, 50,
68 24, 33, 50, 50, 50, 50, 50, 50,
69 50, 50, 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,
75 typedef struct JPGContext {
80 VLC dc_vlc[2], ac_vlc[2];
82 DECLARE_ALIGNED(16, int16_t, block)[6][64];
87 typedef struct G2MContext {
92 int width, height, bpp;
93 int tile_width, tile_height;
94 int tiles_x, tiles_y, tile_x, tile_y;
99 int framebuf_stride, old_width, old_height;
101 uint8_t *synth_tile, *jpeg_tile;
102 int tile_stride, old_tile_w, old_tile_h;
104 uint8_t *kempf_buf, *kempf_flags;
109 int cursor_w, cursor_h, cursor_x, cursor_y;
110 int cursor_hot_x, cursor_hot_y;
113 static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
114 const uint8_t *val_table, int nb_codes,
117 uint8_t huff_size[256] = { 0 };
118 uint16_t huff_code[256];
119 uint16_t huff_sym[256];
122 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
124 for (i = 0; i < 256; i++)
125 huff_sym[i] = i + 16 * is_ac;
128 huff_sym[0] = 16 * 256;
130 return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
131 huff_code, 2, 2, huff_sym, 2, 2, 0);
134 static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
138 ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance,
139 avpriv_mjpeg_val_dc, 12, 0);
142 ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance,
143 avpriv_mjpeg_val_dc, 12, 0);
146 ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance,
147 avpriv_mjpeg_val_ac_luminance, 251, 1);
150 ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance,
151 avpriv_mjpeg_val_ac_chrominance, 251, 1);
155 ff_blockdsp_init(&c->bdsp, avctx);
156 ff_dsputil_init(&c->dsp, avctx);
157 ff_init_scantable(c->dsp.idct_permutation, &c->scantable,
163 static av_cold void jpg_free_context(JPGContext *ctx)
167 for (i = 0; i < 2; i++) {
168 ff_free_vlc(&ctx->dc_vlc[i]);
169 ff_free_vlc(&ctx->ac_vlc[i]);
175 static void jpg_unescape(const uint8_t *src, int src_size,
176 uint8_t *dst, int *dst_size)
178 const uint8_t *src_end = src + src_size;
179 uint8_t *dst_start = dst;
181 while (src < src_end) {
186 if (x == 0xFF && !*src)
189 *dst_size = dst - dst_start;
192 static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
193 int plane, int16_t *block)
196 const int is_chroma = !!plane;
197 const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
199 c->bdsp.clear_block(block);
200 dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3);
202 return AVERROR_INVALIDDATA;
204 dc = get_xbits(gb, dc);
205 dc = dc * qmat[0] + c->prev_dc[plane];
207 c->prev_dc[plane] = dc;
211 val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3);
213 return AVERROR_INVALIDDATA;
217 return val ? AVERROR_INVALIDDATA : 0;
221 val = get_xbits(gb, nbits);
222 val *= qmat[ff_zigzag_direct[pos]];
223 block[c->scantable.permutated[pos]] = val;
229 static inline void yuv2rgb(uint8_t *out, int Y, int U, int V)
231 out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16));
232 out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
233 out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
236 static int jpg_decode_data(JPGContext *c, int width, int height,
237 const uint8_t *src, int src_size,
238 uint8_t *dst, int dst_stride,
239 const uint8_t *mask, int mask_stride, int num_mbs,
243 int mb_w, mb_h, mb_x, mb_y, i, j;
248 if ((ret = av_reallocp(&c->buf,
249 src_size + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
251 jpg_unescape(src, src_size, c->buf, &unesc_size);
252 memset(c->buf + unesc_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
253 init_get_bits(&gb, c->buf, unesc_size * 8);
255 width = FFALIGN(width, 16);
257 mb_h = (height + 15) >> 4;
260 num_mbs = mb_w * mb_h * 4;
262 for (i = 0; i < 3; i++)
263 c->prev_dc[i] = 1024;
265 c->bdsp.clear_blocks(c->block[0]);
266 for (mb_y = 0; mb_y < mb_h; mb_y++) {
267 for (mb_x = 0; mb_x < mb_w; mb_x++) {
268 if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
269 !mask[mb_x * 2 + mask_stride] &&
270 !mask[mb_x * 2 + 1 + mask_stride]) {
274 for (j = 0; j < 2; j++) {
275 for (i = 0; i < 2; i++) {
276 if (mask && !mask[mb_x * 2 + i + j * mask_stride])
279 if ((ret = jpg_decode_block(c, &gb, 0,
280 c->block[i + j * 2])) != 0)
282 c->dsp.idct(c->block[i + j * 2]);
285 for (i = 1; i < 3; i++) {
286 if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
288 c->dsp.idct(c->block[i + 3]);
291 for (j = 0; j < 16; j++) {
292 uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
293 for (i = 0; i < 16; i++) {
296 Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
297 U = c->block[4 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
298 V = c->block[5 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
299 yuv2rgb(out + i * 3, Y, U, V);
310 mask += mask_stride * 2;
316 static void kempf_restore_buf(const uint8_t *src, int len,
317 uint8_t *dst, int stride,
318 const uint8_t *jpeg_tile, int tile_stride,
319 int width, int height,
320 const uint8_t *pal, int npal, int tidx)
325 init_get_bits(&gb, src, len * 8);
327 if (npal <= 2) nb = 1;
328 else if (npal <= 4) nb = 2;
329 else if (npal <= 16) nb = 4;
332 for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) {
333 if (get_bits(&gb, 8))
335 for (i = 0; i < width; i++) {
336 col = get_bits(&gb, nb);
338 memcpy(dst + i * 3, pal + col * 3, 3);
340 memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
345 static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
346 const uint8_t *src, int src_size)
349 int hdr, zsize, npal, tidx = -1, ret;
351 const uint8_t *src_end = src + src_size;
352 uint8_t pal[768], transp[3];
353 uLongf dlen = (c->tile_width + 1) * c->tile_height;
355 int nblocks, cblocks, bstride;
356 int bits, bitbuf, coded;
357 uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
358 tile_y * c->tile_height * c->framebuf_stride;
361 return AVERROR_INVALIDDATA;
363 width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
364 height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
370 memcpy(transp, src, 3);
372 for (j = 0; j < height; j++, dst += c->framebuf_stride)
373 for (i = 0; i < width; i++)
374 memcpy(dst + i * 3, transp, 3);
376 } else if (sub_type == 1) {
377 return jpg_decode_data(&c->jc, width, height, src, src_end - src,
378 dst, c->framebuf_stride, NULL, 0, 0, 0);
382 memcpy(transp, src, 3);
386 if (src_end - src < npal * 3)
387 return AVERROR_INVALIDDATA;
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 + (sub_type != 2))
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++) {
427 return AVERROR_INVALIDDATA;
435 if (cblocks > nblocks)
436 return AVERROR_INVALIDDATA;
437 c->kempf_flags[j * 2 + i * 2 * bstride] =
438 c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
439 c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
440 c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
444 memset(c->jpeg_tile, 0, c->tile_stride * height);
445 jpg_decode_data(&c->jc, width, height, src, src_end - src,
446 c->jpeg_tile, c->tile_stride,
447 c->kempf_flags, bstride, nblocks * 4, 0);
449 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
450 c->jpeg_tile, c->tile_stride,
451 width, height, pal, npal, tidx);
456 static int g2m_init_buffers(G2MContext *c)
460 if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
461 c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3;
462 aligned_height = c->height + 15;
463 av_free(c->framebuf);
464 c->framebuf = av_mallocz(c->framebuf_stride * aligned_height);
466 return AVERROR(ENOMEM);
468 if (!c->synth_tile || !c->jpeg_tile ||
469 c->old_tile_w < c->tile_width ||
470 c->old_tile_h < c->tile_height) {
471 c->tile_stride = FFALIGN(c->tile_width, 16) * 3;
472 aligned_height = FFALIGN(c->tile_height, 16);
473 av_free(c->synth_tile);
474 av_free(c->jpeg_tile);
475 av_free(c->kempf_buf);
476 av_free(c->kempf_flags);
477 c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
478 c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
479 c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height
480 + FF_INPUT_BUFFER_PADDING_SIZE);
481 c->kempf_flags = av_mallocz( c->tile_width * aligned_height);
482 if (!c->synth_tile || !c->jpeg_tile ||
483 !c->kempf_buf || !c->kempf_flags)
484 return AVERROR(ENOMEM);
490 static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
496 uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
497 uint32_t cursor_hot_x, cursor_hot_y;
500 cur_size = bytestream2_get_be32(gb);
501 cursor_w = bytestream2_get_byte(gb);
502 cursor_h = bytestream2_get_byte(gb);
503 cursor_hot_x = bytestream2_get_byte(gb);
504 cursor_hot_y = bytestream2_get_byte(gb);
505 cursor_fmt = bytestream2_get_byte(gb);
507 cursor_stride = FFALIGN(cursor_w, cursor_fmt==1 ? 32 : 1) * 4;
509 if (cursor_w < 1 || cursor_w > 256 ||
510 cursor_h < 1 || cursor_h > 256) {
511 av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %"PRIu32"x%"PRIu32"\n",
513 return AVERROR_INVALIDDATA;
515 if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
516 av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %"PRIu32",%"PRIu32"\n",
517 cursor_hot_x, cursor_hot_y);
518 cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
519 cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
521 if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
522 c->cursor_w * c->cursor_h / 4 > cur_size) {
523 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"/%u\n",
524 cur_size, bytestream2_get_bytes_left(gb));
525 return AVERROR_INVALIDDATA;
527 if (cursor_fmt != 1 && cursor_fmt != 32) {
528 avpriv_report_missing_feature(avctx, "Cursor format %d",
530 return AVERROR_PATCHWELCOME;
533 if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) {
534 av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
538 c->cursor_w = cursor_w;
539 c->cursor_h = cursor_h;
540 c->cursor_hot_x = cursor_hot_x;
541 c->cursor_hot_y = cursor_hot_y;
542 c->cursor_fmt = cursor_fmt;
543 c->cursor_stride = cursor_stride;
546 switch (c->cursor_fmt) {
547 case 1: // old monochrome
548 for (j = 0; j < c->cursor_h; j++) {
549 for (i = 0; i < c->cursor_w; i += 32) {
550 bits = bytestream2_get_be32(gb);
551 for (k = 0; k < 32; k++) {
552 dst[0] = !!(bits & 0x80000000);
560 for (j = 0; j < c->cursor_h; j++) {
561 for (i = 0; i < c->cursor_w; i += 32) {
562 bits = bytestream2_get_be32(gb);
563 for (k = 0; k < 32; k++) {
564 int mask_bit = !!(bits & 0x80000000);
565 switch (dst[0] * 2 + mask_bit) {
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);
604 return AVERROR_PATCHWELCOME;
609 #define APPLY_ALPHA(src, new, alpha) \
610 src = (src * (256 - alpha) + new * alpha) >> 8
612 static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
616 const uint8_t *cursor;
621 x = c->cursor_x - c->cursor_hot_x;
622 y = c->cursor_y - c->cursor_hot_y;
628 if (x + w > c->width)
630 if (y + h > c->height)
640 cursor += -y * c->cursor_stride;
647 for (j = 0; j < h; j++) {
648 for (i = 0; i < w; i++) {
649 uint8_t alpha = cursor[i * 4];
650 APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
651 APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
652 APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
655 cursor += c->cursor_stride;
659 static int g2m_decode_frame(AVCodecContext *avctx, void *data,
660 int *got_picture_ptr, AVPacket *avpkt)
662 const uint8_t *buf = avpkt->data;
663 int buf_size = avpkt->size;
664 G2MContext *c = avctx->priv_data;
666 GetByteContext bc, tbc;
669 uint32_t chunk_size, r_mask, g_mask, b_mask;
670 int chunk_type, chunk_start;
675 av_log(avctx, AV_LOG_ERROR,
676 "Frame should have at least 12 bytes, got %d instead\n",
678 return AVERROR_INVALIDDATA;
681 bytestream2_init(&bc, buf, buf_size);
683 magic = bytestream2_get_be32(&bc);
684 if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
685 (magic & 0xF) < 2 || (magic & 0xF) > 4) {
686 av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
687 return AVERROR_INVALIDDATA;
690 if ((magic & 0xF) != 4) {
691 av_log(avctx, AV_LOG_ERROR, "G2M2 and G2M3 are not yet supported\n");
692 return AVERROR(ENOSYS);
695 while (bytestream2_get_bytes_left(&bc) > 5) {
696 chunk_size = bytestream2_get_le32(&bc) - 1;
697 chunk_type = bytestream2_get_byte(&bc);
698 chunk_start = bytestream2_tell(&bc);
699 if (chunk_size > bytestream2_get_bytes_left(&bc)) {
700 av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %"PRIu32" type %02X\n",
701 chunk_size, chunk_type);
704 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 > avctx->width ||
716 c->height < 16 || c->height > avctx->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 ret = AVERROR_PATCHWELCOME;
736 c->tile_width = bytestream2_get_be32(&bc);
737 c->tile_height = bytestream2_get_be32(&bc);
738 if (!c->tile_width || !c->tile_height ||
739 ((c->tile_width | c->tile_height) & 0xF)) {
740 av_log(avctx, AV_LOG_ERROR,
741 "Invalid tile dimensions %dx%d\n",
742 c->tile_width, c->tile_height);
743 ret = AVERROR_INVALIDDATA;
746 c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
747 c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
748 c->bpp = bytestream2_get_byte(&bc);
750 if (bytestream2_get_bytes_left(&bc) < 16 ||
751 (chunk_size - 21) < 16) {
752 av_log(avctx, AV_LOG_ERROR,
753 "Display info: missing bitmasks!\n");
754 ret = AVERROR_INVALIDDATA;
757 r_mask = bytestream2_get_be32(&bc);
758 g_mask = bytestream2_get_be32(&bc);
759 b_mask = bytestream2_get_be32(&bc);
760 if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) {
761 av_log(avctx, AV_LOG_ERROR,
762 "Invalid or unsupported bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32"\n",
763 r_mask, g_mask, b_mask);
764 ret = AVERROR_PATCHWELCOME;
768 avpriv_request_sample(avctx, "bpp=%d", c->bpp);
769 ret = AVERROR_PATCHWELCOME;
772 if (g2m_init_buffers(c)) {
773 ret = AVERROR(ENOMEM);
779 if (!c->tiles_x || !c->tiles_y) {
780 av_log(avctx, AV_LOG_WARNING,
781 "No display info - skipping tile\n");
784 if (chunk_size < 2) {
785 av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %"PRIu32"\n",
789 c->tile_x = bytestream2_get_byte(&bc);
790 c->tile_y = bytestream2_get_byte(&bc);
791 if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
792 av_log(avctx, AV_LOG_ERROR,
793 "Invalid tile pos %d,%d (in %dx%d grid)\n",
794 c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
798 switch (c->compression) {
800 av_log(avctx, AV_LOG_ERROR,
801 "ePIC j-b compression is not implemented yet\n");
802 return AVERROR(ENOSYS);
803 case COMPR_KEMPF_J_B:
804 ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
805 buf + bytestream2_tell(&bc),
809 if (ret && c->framebuf)
810 av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
811 c->tile_x, c->tile_y);
814 if (chunk_size < 5) {
815 av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n",
819 c->cursor_x = bytestream2_get_be16(&bc);
820 c->cursor_y = bytestream2_get_be16(&bc);
823 if (chunk_size < 8) {
824 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n",
828 bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
830 g2m_load_cursor(avctx, c, &tbc);
836 av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02d\n",
840 /* navigate to next chunk */
841 bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
846 if (c->width && c->height && c->framebuf) {
847 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
850 pic->key_frame = got_header;
851 pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
853 for (i = 0; i < avctx->height; i++)
854 memcpy(pic->data[0] + i * pic->linesize[0],
855 c->framebuf + i * c->framebuf_stride,
857 g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
859 *got_picture_ptr = 1;
872 static av_cold int g2m_decode_init(AVCodecContext *avctx)
874 G2MContext *const c = avctx->priv_data;
877 if ((ret = jpg_init(avctx, &c->jc)) != 0) {
878 av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
879 jpg_free_context(&c->jc);
880 return AVERROR(ENOMEM);
883 avctx->pix_fmt = AV_PIX_FMT_RGB24;
888 static av_cold int g2m_decode_end(AVCodecContext *avctx)
890 G2MContext *const c = avctx->priv_data;
892 jpg_free_context(&c->jc);
894 av_freep(&c->kempf_buf);
895 av_freep(&c->kempf_flags);
896 av_freep(&c->synth_tile);
897 av_freep(&c->jpeg_tile);
898 av_freep(&c->cursor);
899 av_freep(&c->framebuf);
904 AVCodec ff_g2m_decoder = {
906 .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
907 .type = AVMEDIA_TYPE_VIDEO,
908 .id = AV_CODEC_ID_G2M,
909 .priv_data_size = sizeof(G2MContext),
910 .init = g2m_decode_init,
911 .close = g2m_decode_end,
912 .decode = g2m_decode_frame,
913 .capabilities = CODEC_CAP_DR1,