80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
/*
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* Silk Audio Demuxer
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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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/**
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* @file
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* Silk Audio Demuxer
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* #!SILK_V3 + pkt size(2 bytes) + pkt data(raw)
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*/
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#include "avformat.h"
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#include "demux.h"
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#include "internal.h"
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#define SILK_HEADER_DATA "#!SILK_V3"
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#define SILK_HEADER_SIZE 9
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static int silk_probe(const AVProbeData *p)
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{
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if (!strncmp(p->buf, SILK_HEADER_DATA, SILK_HEADER_SIZE))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int silk_read_header(AVFormatContext *s)
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{
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AVStream *st;
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int ret;
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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(s->pb, SILK_HEADER_SIZE);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_SILK;
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av_channel_layout_default(&st->codecpar->ch_layout, 1);
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st->codecpar->sample_rate = 16000;
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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 silk_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int length = avio_rl16(s->pb);
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return av_get_packet(s->pb, pkt, length);
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}
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const FFInputFormat ff_silk_demuxer = {
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.p.name = "silk",
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.p.long_name = NULL_IF_CONFIG_SMALL("Silk Audio Demuxer"),
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.p.flags = AVFMT_GENERIC_INDEX,
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.p.extensions = "silk",
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.p.mime_type = "audio/silk",
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.raw_codec_id = AV_CODEC_ID_SILK,
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.read_probe = silk_probe,
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.read_header = silk_read_header,
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.read_packet = silk_read_packet,
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};
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