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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 "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->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  50.     st->codec->codec_id    = s->codec_id;
  51.     st->codec->sample_rate = s->sample_rate;
  52.     st->codec->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_free_packet(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.