1/* 2 * sndio play and grab interface 3 * Copyright (c) 2010 Jacob Meuser 4 * 5 * This file is part of Libav. 6 * 7 * Libav is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * Libav is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with Libav; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include <stdint.h> 23#include <sndio.h> 24 25#include "libavformat/avformat.h" 26#include "libavformat/internal.h" 27#include "libavutil/opt.h" 28 29#include "sndio_common.h" 30 31static av_cold int audio_read_header(AVFormatContext *s1, 32 AVFormatParameters *ap) 33{ 34 SndioData *s = s1->priv_data; 35 AVStream *st; 36 int ret; 37 38 st = avformat_new_stream(s1, NULL); 39 if (!st) 40 return AVERROR(ENOMEM); 41 42 ret = ff_sndio_open(s1, 0, s1->filename); 43 if (ret < 0) 44 return ret; 45 46 /* take real parameters */ 47 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 48 st->codec->codec_id = s->codec_id; 49 st->codec->sample_rate = s->sample_rate; 50 st->codec->channels = s->channels; 51 52 avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ 53 54 return 0; 55} 56 57static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt) 58{ 59 SndioData *s = s1->priv_data; 60 int64_t bdelay, cur_time; 61 int ret; 62 63 if ((ret = av_new_packet(pkt, s->buffer_size)) < 0) 64 return ret; 65 66 ret = sio_read(s->hdl, pkt->data, pkt->size); 67 if (ret == 0 || sio_eof(s->hdl)) { 68 av_free_packet(pkt); 69 return AVERROR_EOF; 70 } 71 72 pkt->size = ret; 73 s->softpos += ret; 74 75 /* compute pts of the start of the packet */ 76 cur_time = av_gettime(); 77 78 bdelay = ret + s->hwpos - s->softpos; 79 80 /* convert to pts */ 81 pkt->pts = cur_time - ((bdelay * 1000000) / 82 (s->bps * s->channels * s->sample_rate)); 83 84 return 0; 85} 86 87static av_cold int audio_read_close(AVFormatContext *s1) 88{ 89 SndioData *s = s1->priv_data; 90 91 ff_sndio_close(s); 92 93 return 0; 94} 95 96static const AVOption options[] = { 97 { "sample_rate", "", offsetof(SndioData, sample_rate), AV_OPT_TYPE_INT, {.dbl = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, 98 { "channels", "", offsetof(SndioData, channels), AV_OPT_TYPE_INT, {.dbl = 2}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, 99 { NULL }, 100}; 101 102static const AVClass sndio_demuxer_class = { 103 .class_name = "sndio indev", 104 .item_name = av_default_item_name, 105 .option = options, 106 .version = LIBAVUTIL_VERSION_INT, 107}; 108 109AVInputFormat ff_sndio_demuxer = { 110 .name = "sndio", 111 .long_name = NULL_IF_CONFIG_SMALL("sndio audio capture"), 112 .priv_data_size = sizeof(SndioData), 113 .read_header = audio_read_header, 114 .read_packet = audio_read_packet, 115 .read_close = audio_read_close, 116 .flags = AVFMT_NOFILE, 117 .priv_class = &sndio_demuxer_class, 118}; 119