yading@11: /*
yading@11:  * PVF demuxer
yading@11:  * Copyright (c) 2012 Paul B Mahol
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "pcm.h"
yading@11: 
yading@11: static int pvf_probe(AVProbeData *p)
yading@11: {
yading@11:     if (!memcmp(p->buf, "PVF1\n", 5))
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int pvf_read_header(AVFormatContext *s)
yading@11: {
yading@11:     char buffer[32];
yading@11:     AVStream *st;
yading@11:     int bps, channels, sample_rate;
yading@11: 
yading@11:     avio_skip(s->pb, 5);
yading@11:     ff_get_line(s->pb, buffer, sizeof(buffer));
yading@11:     if (sscanf(buffer, "%d %d %d",
yading@11:                &channels,
yading@11:                &sample_rate,
yading@11:                &bps) != 3)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     if (channels <= 0 || bps <= 0 || sample_rate <= 0)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
yading@11:     st->codec->channels    = channels;
yading@11:     st->codec->sample_rate = sample_rate;
yading@11:     st->codec->codec_id    = ff_get_pcm_codec_id(bps, 0, 1, 0xFFFF);
yading@11:     st->codec->bits_per_coded_sample = bps;
yading@11:     st->codec->block_align = bps * st->codec->channels / 8;
yading@11: 
yading@11:     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_pvf_demuxer = {
yading@11:     .name           = "pvf",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("PVF (Portable Voice Format)"),
yading@11:     .read_probe     = pvf_probe,
yading@11:     .read_header    = pvf_read_header,
yading@11:     .read_packet    = ff_pcm_read_packet,
yading@11:     .read_seek      = ff_pcm_read_seek,
yading@11:     .extensions     = "pvf",
yading@11:     .flags          = AVFMT_GENERIC_INDEX,
yading@11: };