87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
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/*
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* Copyright (c) 2018 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 "get_bits.h"
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#include "ac3_parser_internal.h"
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static int eac3_core_filter(AVBSFContext *ctx, AVPacket *pkt)
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{
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AC3HeaderInfo hdr;
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GetBitContext gbc;
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int 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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ret = init_get_bits8(&gbc, pkt->data, pkt->size);
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if (ret < 0)
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goto fail;
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ret = ff_ac3_parse_header(&gbc, &hdr);
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if (ret < 0) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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if (hdr.frame_type == EAC3_FRAME_TYPE_INDEPENDENT ||
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hdr.frame_type == EAC3_FRAME_TYPE_AC3_CONVERT) {
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pkt->size = FFMIN(hdr.frame_size, pkt->size);
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} else if (hdr.frame_type == EAC3_FRAME_TYPE_DEPENDENT && pkt->size > hdr.frame_size) {
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AC3HeaderInfo hdr2;
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ret = init_get_bits8(&gbc, pkt->data + hdr.frame_size, pkt->size - hdr.frame_size);
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if (ret < 0)
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goto fail;
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ret = ff_ac3_parse_header(&gbc, &hdr2);
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if (ret < 0) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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if (hdr2.frame_type == EAC3_FRAME_TYPE_INDEPENDENT ||
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hdr2.frame_type == EAC3_FRAME_TYPE_AC3_CONVERT) {
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pkt->size -= hdr.frame_size;
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pkt->data += hdr.frame_size;
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} else {
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pkt->size = 0;
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}
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} else {
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pkt->size = 0;
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}
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return 0;
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fail:
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av_packet_unref(pkt);
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return ret;
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}
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static const enum AVCodecID codec_ids[] = {
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AV_CODEC_ID_EAC3, AV_CODEC_ID_NONE,
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};
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const AVBitStreamFilter ff_eac3_core_bsf = {
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.name = "eac3_core",
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.filter = eac3_core_filter,
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.codec_ids = codec_ids,
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};
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