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/* |
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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 "bsf.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_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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✓✓ |
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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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✓✗ |
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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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✓✗✓✗
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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 AVBitStreamFilter ff_dca_core_bsf = { |
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.name = "dca_core", |
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.filter = dca_core_filter, |
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.codec_ids = codec_ids, |
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}; |