mirror of
https://github.com/FFmpeg/FFmpeg.git
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61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/*
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* Copyright (c) 2016 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* 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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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "bytestream.h"
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#include "dca_syncwords.h"
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#include "libavutil/mem.h"
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static int dca_core(AVBitStreamFilterContext *bsfc,
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AVCodecContext *avctx, const char *args,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size,
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int keyframe)
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{
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GetByteContext gb;
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uint32_t syncword;
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int core_size = 0;
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bytestream2_init(&gb, buf, buf_size);
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syncword = bytestream2_get_be32(&gb);
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bytestream2_skip(&gb, 1);
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switch (syncword) {
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case DCA_SYNCWORD_CORE_BE:
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core_size = ((bytestream2_get_be24(&gb) >> 4) & 0x3fff) + 1;
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break;
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}
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*poutbuf = (uint8_t *)buf;
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if (core_size > 0 && core_size <= buf_size) {
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*poutbuf_size = core_size;
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} else {
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*poutbuf_size = buf_size;
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}
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return 0;
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}
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AVBitStreamFilter ff_dca_core_bsf = {
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.name = "dca_core",
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.filter = dca_core,
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};
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