120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
|
|
* sndio play and grab interface
|
|
* Copyright (c) 2010 Jacob Meuser
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <sndio.h>
|
|
|
|
#include "libavformat/avformat.h"
|
|
#include "libavformat/internal.h"
|
|
#include "libavutil/opt.h"
|
|
#include "libavutil/time.h"
|
|
|
|
#include "sndio_common.h"
|
|
|
|
static av_cold int audio_read_header(AVFormatContext *s1)
|
|
{
|
|
SndioData *s = s1->priv_data;
|
|
AVStream *st;
|
|
int ret;
|
|
|
|
st = avformat_new_stream(s1, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
ret = ff_sndio_open(s1, 0, s1->filename);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* take real parameters */
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codec->codec_id = s->codec_id;
|
|
st->codec->sample_rate = s->sample_rate;
|
|
st->codec->channels = s->channels;
|
|
|
|
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
|
|
{
|
|
SndioData *s = s1->priv_data;
|
|
int64_t bdelay, cur_time;
|
|
int ret;
|
|
|
|
if ((ret = av_new_packet(pkt, s->buffer_size)) < 0)
|
|
return ret;
|
|
|
|
ret = sio_read(s->hdl, pkt->data, pkt->size);
|
|
if (ret == 0 || sio_eof(s->hdl)) {
|
|
av_free_packet(pkt);
|
|
return AVERROR_EOF;
|
|
}
|
|
|
|
pkt->size = ret;
|
|
s->softpos += ret;
|
|
|
|
/* compute pts of the start of the packet */
|
|
cur_time = av_gettime();
|
|
|
|
bdelay = ret + s->hwpos - s->softpos;
|
|
|
|
/* convert to pts */
|
|
pkt->pts = cur_time - ((bdelay * 1000000) /
|
|
(s->bps * s->channels * s->sample_rate));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int audio_read_close(AVFormatContext *s1)
|
|
{
|
|
SndioData *s = s1->priv_data;
|
|
|
|
ff_sndio_close(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const AVOption options[] = {
|
|
{ "sample_rate", "", offsetof(SndioData, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
|
|
{ "channels", "", offsetof(SndioData, channels), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass sndio_demuxer_class = {
|
|
.class_name = "sndio indev",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
.category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT,
|
|
};
|
|
|
|
AVInputFormat ff_sndio_demuxer = {
|
|
.name = "sndio",
|
|
.long_name = NULL_IF_CONFIG_SMALL("sndio audio capture"),
|
|
.priv_data_size = sizeof(SndioData),
|
|
.read_header = audio_read_header,
|
|
.read_packet = audio_read_packet,
|
|
.read_close = audio_read_close,
|
|
.flags = AVFMT_NOFILE,
|
|
.priv_class = &sndio_demuxer_class,
|
|
};
|