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6147 | serge | 1 | /* |
2 | * sndio play and grab interface |
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3 | * Copyright (c) 2010 Jacob Meuser |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #include |
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23 | #include |
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24 | |||
25 | #include "libavutil/internal.h" |
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26 | #include "libavutil/opt.h" |
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27 | #include "libavutil/time.h" |
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28 | |||
29 | #include "libavformat/avformat.h" |
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30 | #include "libavformat/internal.h" |
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31 | |||
32 | #include "libavdevice/sndio.h" |
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33 | |||
34 | static av_cold int audio_read_header(AVFormatContext *s1) |
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35 | { |
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36 | SndioData *s = s1->priv_data; |
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37 | AVStream *st; |
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38 | int ret; |
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39 | |||
40 | st = avformat_new_stream(s1, NULL); |
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41 | if (!st) |
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42 | return AVERROR(ENOMEM); |
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43 | |||
44 | ret = ff_sndio_open(s1, 0, s1->filename); |
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45 | if (ret < 0) |
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46 | return ret; |
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47 | |||
48 | /* take real parameters */ |
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49 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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50 | st->codec->codec_id = s->codec_id; |
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51 | st->codec->sample_rate = s->sample_rate; |
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52 | st->codec->channels = s->channels; |
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53 | |||
54 | avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ |
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55 | |||
56 | return 0; |
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57 | } |
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58 | |||
59 | static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt) |
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60 | { |
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61 | SndioData *s = s1->priv_data; |
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62 | int64_t bdelay, cur_time; |
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63 | int ret; |
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64 | |||
65 | if ((ret = av_new_packet(pkt, s->buffer_size)) < 0) |
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66 | return ret; |
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67 | |||
68 | ret = sio_read(s->hdl, pkt->data, pkt->size); |
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69 | if (ret == 0 || sio_eof(s->hdl)) { |
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70 | av_free_packet(pkt); |
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71 | return AVERROR_EOF; |
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72 | } |
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73 | |||
74 | pkt->size = ret; |
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75 | s->softpos += ret; |
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76 | |||
77 | /* compute pts of the start of the packet */ |
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78 | cur_time = av_gettime(); |
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79 | |||
80 | bdelay = ret + s->hwpos - s->softpos; |
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81 | |||
82 | /* convert to pts */ |
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83 | pkt->pts = cur_time - ((bdelay * 1000000) / |
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84 | (s->bps * s->channels * s->sample_rate)); |
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85 | |||
86 | return 0; |
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87 | } |
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88 | |||
89 | static av_cold int audio_read_close(AVFormatContext *s1) |
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90 | { |
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91 | SndioData *s = s1->priv_data; |
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92 | |||
93 | ff_sndio_close(s); |
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94 | |||
95 | return 0; |
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96 | } |
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97 | |||
98 | static const AVOption options[] = { |
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99 | { "sample_rate", "", offsetof(SndioData, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
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100 | { "channels", "", offsetof(SndioData, channels), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
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101 | { NULL }, |
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102 | }; |
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103 | |||
104 | static const AVClass sndio_demuxer_class = { |
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105 | .class_name = "sndio indev", |
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106 | .item_name = av_default_item_name, |
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107 | .option = options, |
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108 | .version = LIBAVUTIL_VERSION_INT, |
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109 | .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT, |
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110 | }; |
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111 | |||
112 | AVInputFormat ff_sndio_demuxer = { |
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113 | .name = "sndio", |
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114 | .long_name = NULL_IF_CONFIG_SMALL("sndio audio capture"), |
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115 | .priv_data_size = sizeof(SndioData), |
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116 | .read_header = audio_read_header, |
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117 | .read_packet = audio_read_packet, |
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118 | .read_close = audio_read_close, |
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119 | .flags = AVFMT_NOFILE, |
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120 | .priv_class = &sndio_demuxer_class, |
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121 | };>> |