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https://gitee.com/openharmony/third_party_ffmpeg
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3b0fb00990
Signed-off-by: cyberbox <468042667@qq.com> Change-Id: I63cc2a8c9ff6197c67d6b6b47c124882ad942a22
62 lines
1.7 KiB
C
62 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 "bsf.h"
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#include "bsf_internal.h"
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#include "bytestream.h"
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#include "dca_syncwords.h"
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static int dca_core_filter(AVBSFContext *ctx, AVPacket *pkt)
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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, ret;
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ret = ff_bsf_get_packet_ref(ctx, pkt);
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if (ret < 0)
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return ret;
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bytestream2_init(&gb, pkt->data, pkt->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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if (core_size > 0 && core_size <= pkt->size) {
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pkt->size = core_size;
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}
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return 0;
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}
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static const enum AVCodecID codec_ids[] = {
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AV_CODEC_ID_DTS, AV_CODEC_ID_NONE,
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};
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const FFBitStreamFilter ff_dca_core_bsf = {
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.p.name = "dca_core",
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.p.codec_ids = codec_ids,
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.filter = dca_core_filter,
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};
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