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mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-07 11:13:41 +02:00
FFmpeg/libavdevice/sndio_dec.c
Andreas Rheinhardt b800327f4c avformat/avformat: Add FFInputFormat, hide internals of AVInputFormat
This commit does for AVInputFormat what commit
59c9dc82f4 did for AVOutputFormat:
It adds a new type FFInputFormat, moves all the internals
of AVInputFormat to it and adds a now reduced AVInputFormat
as first member.

This does not affect/improve extensibility of both public
or private fields for demuxers (it is still a mess due to lavd).

This is possible since 50f34172e0
(which removed the last usage of an internal field of AVInputFormat
in fftools).

(Hint: tools/probetest.c accesses the internals of FFInputFormat
as well, but given that it is a testing tool this is not considered
a problem.)

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-07 08:53:31 -03:00

123 lines
3.4 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 "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "libavformat/avformat.h"
#include "libavformat/demux.h"
#include "libavformat/internal.h"
#include "libavdevice/sndio.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->url);
if (ret < 0)
return ret;
/* take real parameters */
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = s->codec_id;
st->codecpar->sample_rate = s->sample_rate;
st->codecpar->ch_layout.nb_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_packet_unref(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,
};
const FFInputFormat ff_sndio_demuxer = {
.p.name = "sndio",
.p.long_name = NULL_IF_CONFIG_SMALL("sndio audio capture"),
.p.flags = AVFMT_NOFILE,
.p.priv_class = &sndio_demuxer_class,
.priv_data_size = sizeof(SndioData),
.read_header = audio_read_header,
.read_packet = audio_read_packet,
.read_close = audio_read_close,
};