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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. };
  108.  
  109. AVInputFormat ff_sndio_demuxer = {
  110.     .name           = "sndio",
  111.     .long_name      = NULL_IF_CONFIG_SMALL("sndio audio capture"),
  112.     .priv_data_size = sizeof(SndioData),
  113.     .read_header    = audio_read_header,
  114.     .read_packet    = audio_read_packet,
  115.     .read_close     = audio_read_close,
  116.     .flags          = AVFMT_NOFILE,
  117.     .priv_class     = &sndio_demuxer_class,
  118. };
  119.