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https://github.com/FFmpeg/FFmpeg.git
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af9cac1be1
* commit '33d18982fa03feb061c8f744a4f0a9175c1f63ab': lavc: add a new bitstream filtering API Conversions-by: Hendrik Leppkes <h.leppkes@gmail.com> Conversions-by: Derek Buitenguis <derek.buitenhuis@gmail.com> Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
67 lines
1.8 KiB
C
67 lines
1.8 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 "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 *out)
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{
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AVPacket *in;
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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(ctx, &in);
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if (ret < 0)
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return ret;
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bytestream2_init(&gb, in->data, in->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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av_packet_move_ref(out, in);
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av_packet_free(&in);
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if (core_size > 0 && core_size <= out->size) {
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out->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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};
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