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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | 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 "libavformat/avformat.h" |
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| 26 | #include "libavformat/internal.h" |
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| 27 | #include "libavutil/opt.h" |
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| 28 | #include "libavutil/time.h" |
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| 29 | |||
| 30 | #include "sndio_common.h" |
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| 31 | |||
| 32 | static av_cold int audio_read_header(AVFormatContext *s1) |
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| 33 | { |
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| 34 | SndioData *s = s1->priv_data; |
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| 35 | AVStream *st; |
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| 36 | int ret; |
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| 37 | |||
| 38 | st = avformat_new_stream(s1, NULL); |
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| 39 | if (!st) |
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| 40 | return AVERROR(ENOMEM); |
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| 41 | |||
| 42 | ret = ff_sndio_open(s1, 0, s1->filename); |
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| 43 | if (ret < 0) |
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| 44 | return ret; |
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| 45 | |||
| 46 | /* take real parameters */ |
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| 47 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 48 | st->codec->codec_id = s->codec_id; |
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| 49 | st->codec->sample_rate = s->sample_rate; |
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| 50 | st->codec->channels = s->channels; |
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| 51 | |||
| 52 | avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ |
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| 53 | |||
| 54 | return 0; |
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| 55 | } |
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| 56 | |||
| 57 | static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt) |
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| 58 | { |
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| 59 | SndioData *s = s1->priv_data; |
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| 60 | int64_t bdelay, cur_time; |
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| 61 | int ret; |
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| 62 | |||
| 63 | if ((ret = av_new_packet(pkt, s->buffer_size)) < 0) |
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| 64 | return ret; |
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| 65 | |||
| 66 | ret = sio_read(s->hdl, pkt->data, pkt->size); |
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| 67 | if (ret == 0 || sio_eof(s->hdl)) { |
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| 68 | av_free_packet(pkt); |
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| 69 | return AVERROR_EOF; |
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| 70 | } |
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| 71 | |||
| 72 | pkt->size = ret; |
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| 73 | s->softpos += ret; |
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| 74 | |||
| 75 | /* compute pts of the start of the packet */ |
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| 76 | cur_time = av_gettime(); |
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| 77 | |||
| 78 | bdelay = ret + s->hwpos - s->softpos; |
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| 79 | |||
| 80 | /* convert to pts */ |
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| 81 | pkt->pts = cur_time - ((bdelay * 1000000) / |
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| 82 | (s->bps * s->channels * s->sample_rate)); |
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| 83 | |||
| 84 | return 0; |
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| 85 | } |
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| 86 | |||
| 87 | static av_cold int audio_read_close(AVFormatContext *s1) |
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| 88 | { |
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| 89 | SndioData *s = s1->priv_data; |
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| 90 | |||
| 91 | ff_sndio_close(s); |
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| 92 | |||
| 93 | return 0; |
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| 94 | } |
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| 95 | |||
| 96 | static const AVOption options[] = { |
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| 97 | { "sample_rate", "", offsetof(SndioData, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
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| 98 | { "channels", "", offsetof(SndioData, channels), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
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| 99 | { NULL }, |
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| 100 | }; |
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| 101 | |||
| 102 | static const AVClass sndio_demuxer_class = { |
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| 103 | .class_name = "sndio indev", |
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| 104 | .item_name = av_default_item_name, |
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| 105 | .option = options, |
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| 106 | .version = LIBAVUTIL_VERSION_INT, |
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| 107 | }; |
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| 108 | |||
| 109 | AVInputFormat ff_sndio_demuxer = { |
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| 110 | .name = "sndio", |
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| 111 | .long_name = NULL_IF_CONFIG_SMALL("sndio audio capture"), |
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| 112 | .priv_data_size = sizeof(SndioData), |
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| 113 | .read_header = audio_read_header, |
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| 114 | .read_packet = audio_read_packet, |
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| 115 | .read_close = audio_read_close, |
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| 116 | .flags = AVFMT_NOFILE, |
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| 117 | .priv_class = &sndio_demuxer_class, |
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| 118 | }; |