diff options
author | Paul B Mahol <onemda@gmail.com> | 2016-03-27 13:02:33 +0200 |
---|---|---|
committer | Paul B Mahol <onemda@gmail.com> | 2016-03-28 10:50:41 +0200 |
commit | ff982e02b5478ee244d5763d14a55b4215f9939b (patch) | |
tree | 1d90420131d876111111b3c2f42bae6b45e3c3e0 /libavcodec/dca_core_bsf.c | |
parent | 308d3ed5aa3a7bb61b1e417bfd6801136c955b39 (diff) |
avcodec: add dca core extraction bsf
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Diffstat (limited to 'libavcodec/dca_core_bsf.c')
-rw-r--r-- | libavcodec/dca_core_bsf.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/libavcodec/dca_core_bsf.c b/libavcodec/dca_core_bsf.c new file mode 100644 index 0000000000..7d372369ef --- /dev/null +++ b/libavcodec/dca_core_bsf.c @@ -0,0 +1,60 @@ +/* + * Copyright (c) 2016 Paul B Mahol + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "avcodec.h" +#include "bytestream.h" +#include "dca_syncwords.h" +#include "libavutil/mem.h" + +static int dca_core(AVBitStreamFilterContext *bsfc, + AVCodecContext *avctx, const char *args, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size, + int keyframe) +{ + GetByteContext gb; + uint32_t syncword; + int core_size = 0; + + bytestream2_init(&gb, buf, buf_size); + syncword = bytestream2_get_be32(&gb); + bytestream2_skip(&gb, 1); + + switch (syncword) { + case DCA_SYNCWORD_CORE_BE: + core_size = ((bytestream2_get_be24(&gb) >> 4) & 0x3fff) + 1; + break; + } + + *poutbuf = (uint8_t *)buf; + + if (core_size > 0 && core_size <= buf_size) { + *poutbuf_size = core_size; + } else { + *poutbuf_size = buf_size; + } + + return 0; +} + +AVBitStreamFilter ff_dca_core_bsf = { + .name = "dca_core", + .filter = dca_core, +}; |