blob: 2d13232bf17a662bef6af560bafaef85ab8cb49c
| 1 | /* |
| 2 | * sndio play and grab interface |
| 3 | * Copyright (c) 2010 Jacob Meuser |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; 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 "libavutil/internal.h" |
| 26 | #include "libavutil/opt.h" |
| 27 | #include "libavutil/time.h" |
| 28 | |
| 29 | #include "libavformat/avformat.h" |
| 30 | #include "libavformat/internal.h" |
| 31 | |
| 32 | #include "libavdevice/sndio.h" |
| 33 | |
| 34 | static av_cold int audio_read_header(AVFormatContext *s1) |
| 35 | { |
| 36 | SndioData *s = s1->priv_data; |
| 37 | AVStream *st; |
| 38 | int ret; |
| 39 | |
| 40 | st = avformat_new_stream(s1, NULL); |
| 41 | if (!st) |
| 42 | return AVERROR(ENOMEM); |
| 43 | |
| 44 | ret = ff_sndio_open(s1, 0, s1->filename); |
| 45 | if (ret < 0) |
| 46 | return ret; |
| 47 | |
| 48 | /* take real parameters */ |
| 49 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| 50 | st->codecpar->codec_id = s->codec_id; |
| 51 | st->codecpar->sample_rate = s->sample_rate; |
| 52 | st->codecpar->channels = s->channels; |
| 53 | |
| 54 | avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ |
| 55 | |
| 56 | return 0; |
| 57 | } |
| 58 | |
| 59 | static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt) |
| 60 | { |
| 61 | SndioData *s = s1->priv_data; |
| 62 | int64_t bdelay, cur_time; |
| 63 | int ret; |
| 64 | |
| 65 | if ((ret = av_new_packet(pkt, s->buffer_size)) < 0) |
| 66 | return ret; |
| 67 | |
| 68 | ret = sio_read(s->hdl, pkt->data, pkt->size); |
| 69 | if (ret == 0 || sio_eof(s->hdl)) { |
| 70 | av_packet_unref(pkt); |
| 71 | return AVERROR_EOF; |
| 72 | } |
| 73 | |
| 74 | pkt->size = ret; |
| 75 | s->softpos += ret; |
| 76 | |
| 77 | /* compute pts of the start of the packet */ |
| 78 | cur_time = av_gettime(); |
| 79 | |
| 80 | bdelay = ret + s->hwpos - s->softpos; |
| 81 | |
| 82 | /* convert to pts */ |
| 83 | pkt->pts = cur_time - ((bdelay * 1000000) / |
| 84 | (s->bps * s->channels * s->sample_rate)); |
| 85 | |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | static av_cold int audio_read_close(AVFormatContext *s1) |
| 90 | { |
| 91 | SndioData *s = s1->priv_data; |
| 92 | |
| 93 | ff_sndio_close(s); |
| 94 | |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | static const AVOption options[] = { |
| 99 | { "sample_rate", "", offsetof(SndioData, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
| 100 | { "channels", "", offsetof(SndioData, channels), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
| 101 | { NULL }, |
| 102 | }; |
| 103 | |
| 104 | static const AVClass sndio_demuxer_class = { |
| 105 | .class_name = "sndio indev", |
| 106 | .item_name = av_default_item_name, |
| 107 | .option = options, |
| 108 | .version = LIBAVUTIL_VERSION_INT, |
| 109 | .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT, |
| 110 | }; |
| 111 | |
| 112 | AVInputFormat ff_sndio_demuxer = { |
| 113 | .name = "sndio", |
| 114 | .long_name = NULL_IF_CONFIG_SMALL("sndio audio capture"), |
| 115 | .priv_data_size = sizeof(SndioData), |
| 116 | .read_header = audio_read_header, |
| 117 | .read_packet = audio_read_packet, |
| 118 | .read_close = audio_read_close, |
| 119 | .flags = AVFMT_NOFILE, |
| 120 | .priv_class = &sndio_demuxer_class, |
| 121 | }; |
| 122 |