mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-27 13:10:37 +00:00
101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
/*
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* Copyright (c) 2021 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 "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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static int binka_probe(const AVProbeData *p)
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{
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if (AV_RB32(p->buf) == MKBETAG('1', 'F', 'C', 'B') &&
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(p->buf[4] == 1 || p->buf[4] == 2))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int binka_read_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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AVStream *st;
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int entries, offset;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avio_skip(pb, 5);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
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st->codecpar->channels = avio_r8(pb);
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st->codecpar->sample_rate = avio_rl16(pb);
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st->duration = avio_rl32(pb);
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avio_skip(pb, 8);
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entries = avio_rl16(pb);
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offset = entries * 2 + 2;
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avio_skip(pb, offset);
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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return 0;
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}
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static int binka_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVIOContext *pb = s->pb;
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AVStream *st = s->streams[0];
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int64_t pos;
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int pkt_size;
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int ret;
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if (avio_feof(pb))
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return AVERROR_EOF;
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pos = avio_tell(pb);
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avio_skip(pb, 2);
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pkt_size = avio_rl16(pb) + 4;
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if (pkt_size <= 4)
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return AVERROR(EIO);
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ret = av_new_packet(pkt, pkt_size);
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if (ret < 0)
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return ret;
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avio_read(pb, pkt->data + 4, pkt_size - 4);
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AV_WL32(pkt->data, pkt_size);
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pkt->pos = pos;
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pkt->stream_index = 0;
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pkt->duration = av_get_audio_frame_duration2(st->codecpar, 0);
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return 0;
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}
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const AVInputFormat ff_binka_demuxer = {
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.name = "binka",
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.long_name = NULL_IF_CONFIG_SMALL("Bink Audio"),
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.read_probe = binka_probe,
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.read_header = binka_read_header,
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.read_packet = binka_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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.extensions = "binka",
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};
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