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ffmpeg / libavdevice / sndio_dec.c @ 15d59d2c

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/*
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 * sndio play and grab interface
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 * Copyright (c) 2010 Jacob Meuser
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 *
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 * This file is part of Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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 <stdint.h>
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#include <sndio.h>
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#include "libavformat/avformat.h"
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#include "sndio_common.h"
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static av_cold int audio_read_header(AVFormatContext *s1,
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                                     AVFormatParameters *ap)
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{
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    SndioData *s = s1->priv_data;
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    AVStream *st;
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    int ret;
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    if (ap->sample_rate <= 0 || ap->channels <= 0)
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        return AVERROR(EINVAL);
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    st = av_new_stream(s1, 0);
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    if (!st)
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        return AVERROR(ENOMEM);
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    s->sample_rate = ap->sample_rate;
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    s->channels    = ap->channels;
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    ret = ff_sndio_open(s1, 0, s1->filename);
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    if (ret < 0)
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        return ret;
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    /* take real parameters */
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    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
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    st->codec->codec_id    = s->codec_id;
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    st->codec->sample_rate = s->sample_rate;
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    st->codec->channels    = s->channels;
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    av_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */
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    return 0;
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}
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static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
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{
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    SndioData *s = s1->priv_data;
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    int64_t bdelay, cur_time;
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    int ret;
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    if ((ret = av_new_packet(pkt, s->buffer_size)) < 0)
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        return ret;
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    ret = sio_read(s->hdl, pkt->data, pkt->size);
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    if (ret == 0 || sio_eof(s->hdl)) {
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        av_free_packet(pkt);
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        return AVERROR_EOF;
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    }
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    pkt->size   = ret;
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    s->softpos += ret;
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    /* compute pts of the start of the packet */
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    cur_time = av_gettime();
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    bdelay = ret + s->hwpos - s->softpos;
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    /* convert to pts */
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    pkt->pts = cur_time - ((bdelay * 1000000) /
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        (s->bps * s->channels * s->sample_rate));
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    return 0;
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}
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static av_cold int audio_read_close(AVFormatContext *s1)
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{
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    SndioData *s = s1->priv_data;
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    ff_sndio_close(s);
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    return 0;
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}
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AVInputFormat ff_sndio_demuxer = {
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    .name           = "sndio",
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    .long_name      = NULL_IF_CONFIG_SMALL("sndio audio capture"),
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    .priv_data_size = sizeof(SndioData),
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    .read_header    = audio_read_header,
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    .read_packet    = audio_read_packet,
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    .read_close     = audio_read_close,
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    .flags          = AVFMT_NOFILE,
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};