yading@10: /*
yading@10:  * sndio play and grab interface
yading@10:  * Copyright (c) 2010 Jacob Meuser
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include <stdint.h>
yading@10: #include <sndio.h>
yading@10: 
yading@10: #include "libavformat/avformat.h"
yading@10: #include "libavformat/internal.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/time.h"
yading@10: 
yading@10: #include "sndio_common.h"
yading@10: 
yading@10: static av_cold int audio_read_header(AVFormatContext *s1)
yading@10: {
yading@10:     SndioData *s = s1->priv_data;
yading@10:     AVStream *st;
yading@10:     int ret;
yading@10: 
yading@10:     st = avformat_new_stream(s1, NULL);
yading@10:     if (!st)
yading@10:         return AVERROR(ENOMEM);
yading@10: 
yading@10:     ret = ff_sndio_open(s1, 0, s1->filename);
yading@10:     if (ret < 0)
yading@10:         return ret;
yading@10: 
yading@10:     /* take real parameters */
yading@10:     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
yading@10:     st->codec->codec_id    = s->codec_id;
yading@10:     st->codec->sample_rate = s->sample_rate;
yading@10:     st->codec->channels    = s->channels;
yading@10: 
yading@10:     avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
yading@10: {
yading@10:     SndioData *s = s1->priv_data;
yading@10:     int64_t bdelay, cur_time;
yading@10:     int ret;
yading@10: 
yading@10:     if ((ret = av_new_packet(pkt, s->buffer_size)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     ret = sio_read(s->hdl, pkt->data, pkt->size);
yading@10:     if (ret == 0 || sio_eof(s->hdl)) {
yading@10:         av_free_packet(pkt);
yading@10:         return AVERROR_EOF;
yading@10:     }
yading@10: 
yading@10:     pkt->size   = ret;
yading@10:     s->softpos += ret;
yading@10: 
yading@10:     /* compute pts of the start of the packet */
yading@10:     cur_time = av_gettime();
yading@10: 
yading@10:     bdelay = ret + s->hwpos - s->softpos;
yading@10: 
yading@10:     /* convert to pts */
yading@10:     pkt->pts = cur_time - ((bdelay * 1000000) /
yading@10:         (s->bps * s->channels * s->sample_rate));
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int audio_read_close(AVFormatContext *s1)
yading@10: {
yading@10:     SndioData *s = s1->priv_data;
yading@10: 
yading@10:     ff_sndio_close(s);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static const AVOption options[] = {
yading@10:     { "sample_rate", "", offsetof(SndioData, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
yading@10:     { "channels",    "", offsetof(SndioData, channels),    AV_OPT_TYPE_INT, {.i64 = 2},     1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: static const AVClass sndio_demuxer_class = {
yading@10:     .class_name     = "sndio indev",
yading@10:     .item_name      = av_default_item_name,
yading@10:     .option         = options,
yading@10:     .version        = LIBAVUTIL_VERSION_INT,
yading@10: };
yading@10: 
yading@10: AVInputFormat ff_sndio_demuxer = {
yading@10:     .name           = "sndio",
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("sndio audio capture"),
yading@10:     .priv_data_size = sizeof(SndioData),
yading@10:     .read_header    = audio_read_header,
yading@10:     .read_packet    = audio_read_packet,
yading@10:     .read_close     = audio_read_close,
yading@10:     .flags          = AVFMT_NOFILE,
yading@10:     .priv_class     = &sndio_demuxer_class,
yading@10: };