mirror of
https://github.com/FFmpeg/FFmpeg.git
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87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
/*
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* PVF demuxer
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* Copyright (c) 2012 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 "avformat.h"
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#include "internal.h"
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#include "pcm.h"
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static int pvf_probe(AVProbeData *p)
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{
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if (!memcmp(p->buf, "PVF1\n", 5))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int pvf_read_header(AVFormatContext *s)
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{
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char buffer[32];
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AVStream *st;
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int bps, channels, sample_rate;
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avio_skip(s->pb, 5);
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ff_get_line(s->pb, (char *)&buffer, 32);
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if (sscanf(buffer, "%d %d %d",
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&channels,
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&sample_rate,
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&bps) != 3)
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return AVERROR_INVALIDDATA;
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if (channels <= 0 || bps <= 0 || sample_rate <= 0)
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return AVERROR_INVALIDDATA;
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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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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->channels = channels;
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st->codec->sample_rate = sample_rate;
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st->codec->codec_id = ff_get_pcm_codec_id(bps, 0, 1, 0xFFFF);
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st->codec->bits_per_coded_sample = bps;
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st->codec->block_align = bps * st->codec->channels / 8;
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
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return 0;
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}
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static int pvf_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret;
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ret = av_get_packet(s->pb, pkt, 1024 * s->streams[0]->codec->block_align);
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
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pkt->stream_index = 0;
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return ret;
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}
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AVInputFormat ff_pvf_demuxer = {
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.name = "pvf",
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.long_name = NULL_IF_CONFIG_SMALL("PVF (Portable Voice Format)"),
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.read_probe = pvf_probe,
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.read_header = pvf_read_header,
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.read_packet = pvf_read_packet,
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.read_seek = ff_pcm_read_seek,
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.extensions = "pvf",
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.flags = AVFMT_GENERIC_INDEX,
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};
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