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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 "libavformat/avformat.h" | |
26 | #include "libavformat/internal.h" | |
27 | #include "libavutil/opt.h" | |
28 | #include "libavutil/time.h" | |
29 | ||
30 | #include "sndio_common.h" | |
31 | ||
32 | static av_cold int audio_read_header(AVFormatContext *s1) | |
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 | ||
57 | static 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 | ||
87 | static 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 | ||
96 | static const AVOption options[] = { | |
97 | { "sample_rate", "", offsetof(SndioData, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, | |
98 | { "channels", "", offsetof(SndioData, channels), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, | |
99 | { NULL }, | |
100 | }; | |
101 | ||
102 | static 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 | .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT, | |
108 | }; | |
109 | ||
110 | AVInputFormat ff_sndio_demuxer = { | |
111 | .name = "sndio", | |
112 | .long_name = NULL_IF_CONFIG_SMALL("sndio audio capture"), | |
113 | .priv_data_size = sizeof(SndioData), | |
114 | .read_header = audio_read_header, | |
115 | .read_packet = audio_read_packet, | |
116 | .read_close = audio_read_close, | |
117 | .flags = AVFMT_NOFILE, | |
118 | .priv_class = &sndio_demuxer_class, | |
119 | }; |