3
* Copyright (c) 2012 Konstantin Shishkov
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* This file is part of Libav.
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* 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
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* version 2.1 of the License, or (at your option) any later version.
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* Libav is distributed in the hope that it will be useful,
13
* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* 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] = {
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8, 6, 5, 8, 12, 20, 26, 31,
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6, 6, 7, 10, 13, 29, 30, 28,
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7, 7, 8, 12, 20, 29, 35, 28,
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7, 9, 11, 15, 26, 44, 40, 31,
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9, 11, 19, 28, 34, 55, 52, 39,
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12, 18, 28, 32, 41, 52, 57, 46,
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25, 32, 39, 44, 52, 61, 60, 51,
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36, 46, 48, 49, 56, 50, 52, 50
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static const uint8_t chroma_quant[64] = {
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9, 9, 12, 24, 50, 50, 50, 50,
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9, 11, 13, 33, 50, 50, 50, 50,
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12, 13, 28, 50, 50, 50, 50, 50,
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24, 33, 50, 50, 50, 50, 50, 50,
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50, 50, 50, 50, 50, 50, 50, 50,
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50, 50, 50, 50, 50, 50, 50, 50,
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50, 50, 50, 50, 50, 50, 50, 50,
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50, 50, 50, 50, 50, 50, 50, 50,
73
typedef struct JPGContext {
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VLC dc_vlc[2], ac_vlc[2];
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DECLARE_ALIGNED(16, int16_t, block)[6][64];
84
typedef struct G2MContext {
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int width, height, bpp;
90
int tile_width, tile_height;
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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;
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int cursor_hot_x, cursor_hot_y;
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static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
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const uint8_t *val_table, int nb_codes,
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uint8_t huff_size[256] = { 0 };
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uint16_t huff_code[256];
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uint16_t huff_sym[256];
119
ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
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for (i = 0; i < 256; i++)
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huff_sym[i] = i + 16 * is_ac;
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huff_sym[0] = 16 * 256;
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return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
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huff_code, 2, 2, huff_sym, 2, 2, 0);
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static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
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ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance,
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avpriv_mjpeg_val_dc, 12, 0);
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ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance,
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avpriv_mjpeg_val_dc, 12, 0);
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ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance,
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avpriv_mjpeg_val_ac_luminance, 251, 1);
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ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance,
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avpriv_mjpeg_val_ac_chrominance, 251, 1);
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ff_dsputil_init(&c->dsp, avctx);
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ff_init_scantable(c->dsp.idct_permutation, &c->scantable,
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static av_cold void jpg_free_context(JPGContext *ctx)
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for (i = 0; i < 2; i++) {
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ff_free_vlc(&ctx->dc_vlc[i]);
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ff_free_vlc(&ctx->ac_vlc[i]);
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static void jpg_unescape(const uint8_t *src, int src_size,
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uint8_t *dst, int *dst_size)
174
const uint8_t *src_end = src + src_size;
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uint8_t *dst_start = dst;
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while (src < src_end) {
182
if (x == 0xFF && !*src)
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*dst_size = dst - dst_start;
188
static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
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int plane, int16_t *block)
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const int is_chroma = !!plane;
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const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
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c->dsp.clear_block(block);
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dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3);
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return AVERROR_INVALIDDATA;
200
dc = get_xbits(gb, dc);
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dc = dc * qmat[0] + c->prev_dc[plane];
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c->prev_dc[plane] = dc;
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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);
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val *= qmat[ff_zigzag_direct[pos]];
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block[c->scantable.permutated[pos]] = val;
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static inline void yuv2rgb(uint8_t *out, int Y, int U, int V)
227
out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16));
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out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
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out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
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static int jpg_decode_data(JPGContext *c, int width, int height,
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const uint8_t *src, int src_size,
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uint8_t *dst, int dst_stride,
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const uint8_t *mask, int mask_stride, int num_mbs,
239
int mb_w, mb_h, mb_x, mb_y, i, j;
244
if ((ret = av_reallocp(&c->buf,
245
src_size + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
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jpg_unescape(src, src_size, c->buf, &unesc_size);
248
memset(c->buf + unesc_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
249
init_get_bits(&gb, c->buf, unesc_size * 8);
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width = FFALIGN(width, 16);
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mb_h = (height + 15) >> 4;
256
num_mbs = mb_w * mb_h * 4;
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for (i = 0; i < 3; i++)
259
c->prev_dc[i] = 1024;
261
c->dsp.clear_blocks(c->block[0]);
262
for (mb_y = 0; mb_y < mb_h; mb_y++) {
263
for (mb_x = 0; mb_x < mb_w; mb_x++) {
264
if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
265
!mask[mb_x * 2 + mask_stride] &&
266
!mask[mb_x * 2 + 1 + mask_stride]) {
270
for (j = 0; j < 2; j++) {
271
for (i = 0; i < 2; i++) {
272
if (mask && !mask[mb_x * 2 + i + j * mask_stride])
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if ((ret = jpg_decode_block(c, &gb, 0,
276
c->block[i + j * 2])) != 0)
278
c->dsp.idct(c->block[i + j * 2]);
281
for (i = 1; i < 3; i++) {
282
if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
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c->dsp.idct(c->block[i + 3]);
287
for (j = 0; j < 16; j++) {
288
uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
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for (i = 0; i < 16; i++) {
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Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
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U = c->block[4 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
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V = c->block[5 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
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yuv2rgb(out + i * 3, Y, U, V);
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mask += mask_stride * 2;
312
static void kempf_restore_buf(const uint8_t *src, int len,
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uint8_t *dst, int stride,
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const uint8_t *jpeg_tile, int tile_stride,
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int width, int height,
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const uint8_t *pal, int npal, int tidx)
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init_get_bits(&gb, src, len * 8);
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if (npal <= 2) nb = 1;
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else if (npal <= 4) nb = 2;
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else if (npal <= 16) nb = 4;
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for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) {
329
if (get_bits(&gb, 8))
331
for (i = 0; i < width; i++) {
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col = get_bits(&gb, nb);
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memcpy(dst + i * 3, pal + col * 3, 3);
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memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
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static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
342
const uint8_t *src, int src_size)
345
int hdr, zsize, npal, tidx = -1, ret;
347
const uint8_t *src_end = src + src_size;
348
uint8_t pal[768], transp[3];
349
uLongf dlen = (c->tile_width + 1) * c->tile_height;
351
int nblocks, cblocks, bstride;
352
int bits, bitbuf, coded;
353
uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
354
tile_y * c->tile_height * c->framebuf_stride;
357
return AVERROR_INVALIDDATA;
359
width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
360
height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
366
memcpy(transp, src, 3);
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for (j = 0; j < height; j++, dst += c->framebuf_stride)
369
for (i = 0; i < width; i++)
370
memcpy(dst + i * 3, transp, 3);
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} else if (sub_type == 1) {
373
return jpg_decode_data(&c->jc, width, height, src, src_end - src,
374
dst, c->framebuf_stride, NULL, 0, 0, 0);
378
memcpy(transp, src, 3);
382
memcpy(pal, src, npal * 3); src += npal * 3;
384
for (i = 0; i < npal; i++) {
385
if (!memcmp(pal + i * 3, transp, 3)) {
392
if (src_end - src < 2)
394
zsize = (src[0] << 8) | src[1]; src += 2;
396
if (src_end - src < zsize)
397
return AVERROR_INVALIDDATA;
399
ret = uncompress(c->kempf_buf, &dlen, src, zsize);
401
return AVERROR_INVALIDDATA;
405
kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
406
NULL, 0, width, height, pal, npal, tidx);
410
nblocks = *src++ + 1;
412
bstride = FFALIGN(width, 16) >> 3;
413
// blocks are coded LSB and we need normal bitreader for JPEG data
415
for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
416
for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
425
if (cblocks > nblocks)
426
return AVERROR_INVALIDDATA;
427
c->kempf_flags[j * 2 + i * 2 * bstride] =
428
c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
429
c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
430
c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
434
memset(c->jpeg_tile, 0, c->tile_stride * height);
435
jpg_decode_data(&c->jc, width, height, src, src_end - src,
436
c->jpeg_tile, c->tile_stride,
437
c->kempf_flags, bstride, nblocks * 4, 0);
439
kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
440
c->jpeg_tile, c->tile_stride,
441
width, height, pal, npal, tidx);
446
static int g2m_init_buffers(G2MContext *c)
450
if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
451
c->framebuf_stride = FFALIGN(c->width * 3, 16);
452
aligned_height = FFALIGN(c->height, 16);
453
av_free(c->framebuf);
454
c->framebuf = av_mallocz(c->framebuf_stride * aligned_height);
456
return AVERROR(ENOMEM);
458
if (!c->synth_tile || !c->jpeg_tile ||
459
c->old_tile_w < c->tile_width ||
460
c->old_tile_h < c->tile_height) {
461
c->tile_stride = FFALIGN(c->tile_width * 3, 16);
462
aligned_height = FFALIGN(c->tile_height, 16);
463
av_free(c->synth_tile);
464
av_free(c->jpeg_tile);
465
av_free(c->kempf_buf);
466
av_free(c->kempf_flags);
467
c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
468
c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
469
c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height
470
+ FF_INPUT_BUFFER_PADDING_SIZE);
471
c->kempf_flags = av_mallocz( c->tile_width * aligned_height);
472
if (!c->synth_tile || !c->jpeg_tile ||
473
!c->kempf_buf || !c->kempf_flags)
474
return AVERROR(ENOMEM);
480
static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
486
uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
487
uint32_t cursor_hot_x, cursor_hot_y;
490
cur_size = bytestream2_get_be32(gb);
491
cursor_w = bytestream2_get_byte(gb);
492
cursor_h = bytestream2_get_byte(gb);
493
cursor_hot_x = bytestream2_get_byte(gb);
494
cursor_hot_y = bytestream2_get_byte(gb);
495
cursor_fmt = bytestream2_get_byte(gb);
497
cursor_stride = FFALIGN(cursor_w, 32) * 4;
499
if (cursor_w < 1 || cursor_w > 256 ||
500
cursor_h < 1 || cursor_h > 256) {
501
av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %dx%d\n",
503
return AVERROR_INVALIDDATA;
505
if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
506
av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %d,%d\n",
507
cursor_hot_x, cursor_hot_y);
508
cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
509
cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
511
if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
512
c->cursor_w * c->cursor_h / 4 > cur_size) {
513
av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %d/%d\n",
514
cur_size, bytestream2_get_bytes_left(gb));
515
return AVERROR_INVALIDDATA;
517
if (cursor_fmt != 1 && cursor_fmt != 32) {
518
avpriv_report_missing_feature(avctx, "Cursor format %d",
520
return AVERROR_PATCHWELCOME;
523
if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) {
524
av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
528
c->cursor_w = cursor_w;
529
c->cursor_h = cursor_h;
530
c->cursor_hot_x = cursor_hot_x;
531
c->cursor_hot_y = cursor_hot_y;
532
c->cursor_fmt = cursor_fmt;
533
c->cursor_stride = cursor_stride;
536
switch (c->cursor_fmt) {
537
case 1: // old monochrome
538
for (j = 0; j < c->cursor_h; j++) {
539
for (i = 0; i < c->cursor_w; i += 32) {
540
bits = bytestream2_get_be32(gb);
541
for (k = 0; k < 32; k++) {
542
dst[0] = !!(bits & 0x80000000);
547
dst += c->cursor_stride - c->cursor_w * 4;
551
for (j = 0; j < c->cursor_h; j++) {
552
for (i = 0; i < c->cursor_w; i += 32) {
553
bits = bytestream2_get_be32(gb);
554
for (k = 0; k < 32; k++) {
555
int mask_bit = !!(bits & 0x80000000);
556
switch (dst[0] * 2 + mask_bit) {
558
dst[0] = 0xFF; dst[1] = 0x00;
559
dst[2] = 0x00; dst[3] = 0x00;
562
dst[0] = 0xFF; dst[1] = 0xFF;
563
dst[2] = 0xFF; dst[3] = 0xFF;
566
dst[0] = 0x00; dst[1] = 0x00;
567
dst[2] = 0x00; dst[3] = 0x00;
573
dst += c->cursor_stride - c->cursor_w * 4;
576
case 32: // full colour
577
/* skip monochrome version of the cursor and decode RGBA instead */
578
bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
579
for (j = 0; j < c->cursor_h; j++) {
580
for (i = 0; i < c->cursor_w; i++) {
581
int val = bytestream2_get_be32(gb);
587
dst += c->cursor_stride - c->cursor_w * 4;
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;
656
uint32_t chunk_size, r_mask, g_mask, b_mask;
657
int chunk_type, chunk_start;
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
chunk_start = bytestream2_tell(&bc);
686
if (chunk_size > bytestream2_get_bytes_left(&bc)) {
687
av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %d type %02X\n",
688
chunk_size, chunk_type);
691
switch (chunk_type) {
694
if (chunk_size < 21) {
695
av_log(avctx, AV_LOG_ERROR, "Invalid display info size %d\n",
699
c->width = bytestream2_get_be32(&bc);
700
c->height = bytestream2_get_be32(&bc);
701
if (c->width < 16 || c->width > avctx->width ||
702
c->height < 16 || c->height > avctx->height) {
703
av_log(avctx, AV_LOG_ERROR,
704
"Invalid frame dimensions %dx%d\n",
705
c->width, c->height);
706
ret = AVERROR_INVALIDDATA;
709
if (c->width != avctx->width || c->height != avctx->height)
710
ff_set_dimensions(avctx, c->width, c->height);
711
c->compression = bytestream2_get_be32(&bc);
712
if (c->compression != 2 && c->compression != 3) {
713
av_log(avctx, AV_LOG_ERROR,
714
"Unknown compression method %d\n",
716
return AVERROR_PATCHWELCOME;
718
c->tile_width = bytestream2_get_be32(&bc);
719
c->tile_height = bytestream2_get_be32(&bc);
720
if (!c->tile_width || !c->tile_height ||
721
((c->tile_width | c->tile_height) & 0xF)) {
722
av_log(avctx, AV_LOG_ERROR,
723
"Invalid tile dimensions %dx%d\n",
724
c->tile_width, c->tile_height);
725
ret = AVERROR_INVALIDDATA;
728
c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
729
c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
730
c->bpp = bytestream2_get_byte(&bc);
732
if (bytestream2_get_bytes_left(&bc) < 16 ||
733
(chunk_size - 21) < 16 ) {
734
av_log(avctx, AV_LOG_ERROR,
735
"Display info: missing bitmasks!\n");
736
return AVERROR_INVALIDDATA;
738
r_mask = bytestream2_get_be32(&bc);
739
g_mask = bytestream2_get_be32(&bc);
740
b_mask = bytestream2_get_be32(&bc);
741
if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) {
742
av_log(avctx, AV_LOG_ERROR,
743
"Invalid or unsupported bitmasks: R=%X, G=%X, B=%X\n",
744
r_mask, g_mask, b_mask);
745
return AVERROR_PATCHWELCOME;
748
avpriv_request_sample(avctx, "bpp=%d", c->bpp);
749
return AVERROR_PATCHWELCOME;
751
if (g2m_init_buffers(c)) {
752
ret = AVERROR(ENOMEM);
758
if (!c->tiles_x || !c->tiles_y) {
759
av_log(avctx, AV_LOG_WARNING,
760
"No display info - skipping tile\n");
763
if (chunk_size < 2) {
764
av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %d\n",
768
c->tile_x = bytestream2_get_byte(&bc);
769
c->tile_y = bytestream2_get_byte(&bc);
770
if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
771
av_log(avctx, AV_LOG_ERROR,
772
"Invalid tile pos %d,%d (in %dx%d grid)\n",
773
c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
777
switch (c->compression) {
779
av_log(avctx, AV_LOG_ERROR,
780
"ePIC j-b compression is not implemented yet\n");
781
return AVERROR(ENOSYS);
782
case COMPR_KEMPF_J_B:
783
ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
784
buf + bytestream2_tell(&bc),
788
if (ret && c->framebuf)
789
av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
790
c->tile_x, c->tile_y);
793
if (chunk_size < 5) {
794
av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %d\n",
798
c->cursor_x = bytestream2_get_be16(&bc);
799
c->cursor_y = bytestream2_get_be16(&bc);
802
if (chunk_size < 8) {
803
av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %d\n",
807
bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
809
g2m_load_cursor(avctx, c, &tbc);
815
av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02X\n",
819
/* navigate to next chunk */
820
bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
825
if (c->width && c->height) {
826
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) {
827
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
831
pic->key_frame = got_header;
832
pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
834
for (i = 0; i < avctx->height; i++)
835
memcpy(pic->data[0] + i * pic->linesize[0],
836
c->framebuf + i * c->framebuf_stride,
838
g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
840
*got_picture_ptr = 1;
845
c->width = c->height = 0;
846
c->tiles_x = c->tiles_y = 0;
850
static av_cold int g2m_decode_init(AVCodecContext *avctx)
852
G2MContext * const c = avctx->priv_data;
855
if ((ret = jpg_init(avctx, &c->jc)) != 0) {
856
av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
857
jpg_free_context(&c->jc);
858
return AVERROR(ENOMEM);
861
avctx->pix_fmt = AV_PIX_FMT_RGB24;
866
static av_cold int g2m_decode_end(AVCodecContext *avctx)
868
G2MContext * const c = avctx->priv_data;
870
jpg_free_context(&c->jc);
872
av_freep(&c->kempf_buf);
873
av_freep(&c->kempf_flags);
874
av_freep(&c->synth_tile);
875
av_freep(&c->jpeg_tile);
876
av_freep(&c->cursor);
877
av_freep(&c->framebuf);
882
AVCodec ff_g2m_decoder = {
884
.long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
885
.type = AVMEDIA_TYPE_VIDEO,
886
.id = AV_CODEC_ID_G2M,
887
.priv_data_size = sizeof(G2MContext),
888
.init = g2m_decode_init,
889
.close = g2m_decode_end,
890
.decode = g2m_decode_frame,
891
.capabilities = CODEC_CAP_DR1,