2 * Copyright (c) 2016 Paul B Mahol
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "bytestream.h"
23 #include "dca_syncwords.h"
24 #include "libavutil/mem.h"
26 static int dca_core(AVBitStreamFilterContext *bsfc,
27 AVCodecContext *avctx, const char *args,
28 uint8_t **poutbuf, int *poutbuf_size,
29 const uint8_t *buf, int buf_size,
36 bytestream2_init(&gb, buf, buf_size);
37 syncword = bytestream2_get_be32(&gb);
38 bytestream2_skip(&gb, 1);
41 case DCA_SYNCWORD_CORE_BE:
42 core_size = ((bytestream2_get_be24(&gb) >> 4) & 0x3fff) + 1;
46 *poutbuf = (uint8_t *)buf;
48 if (core_size > 0 && core_size <= buf_size) {
49 *poutbuf_size = core_size;
51 *poutbuf_size = buf_size;
57 AVBitStreamFilter ff_dca_core_bsf = {