0,0 → 1,118 |
/* |
* 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, |
}; |
|
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, |
}; |