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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.  
  27.  
  28. #include "libavdevice/avdevice.h"
  29. #include "libavdevice/sndio.h"
  30.  
  31. static av_cold int audio_write_header(AVFormatContext *s1)
  32. {
  33.     SndioData *s = s1->priv_data;
  34.     AVStream *st;
  35.     int ret;
  36.  
  37.     st             = s1->streams[0];
  38.     s->sample_rate = st->codec->sample_rate;
  39.     s->channels    = st->codec->channels;
  40.  
  41.     ret = ff_sndio_open(s1, 1, s1->filename);
  42.  
  43.     return ret;
  44. }
  45.  
  46. static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
  47. {
  48.     SndioData *s = s1->priv_data;
  49.     uint8_t *buf= pkt->data;
  50.     int size = pkt->size;
  51.     int len, ret;
  52.  
  53.     while (size > 0) {
  54.         len = FFMIN(s->buffer_size - s->buffer_offset, size);
  55.         memcpy(s->buffer + s->buffer_offset, buf, len);
  56.         buf  += len;
  57.         size -= len;
  58.         s->buffer_offset += len;
  59.         if (s->buffer_offset >= s->buffer_size) {
  60.             ret = sio_write(s->hdl, s->buffer, s->buffer_size);
  61.             if (ret == 0 || sio_eof(s->hdl))
  62.                 return AVERROR(EIO);
  63.             s->softpos      += ret;
  64.             s->buffer_offset = 0;
  65.         }
  66.     }
  67.  
  68.     return 0;
  69. }
  70.  
  71. static int audio_write_trailer(AVFormatContext *s1)
  72. {
  73.     SndioData *s = s1->priv_data;
  74.  
  75.     sio_write(s->hdl, s->buffer, s->buffer_offset);
  76.  
  77.     ff_sndio_close(s);
  78.  
  79.     return 0;
  80. }
  81.  
  82. static const AVClass sndio_muxer_class = {
  83.     .class_name     = "sndio outdev",
  84.     .item_name      = av_default_item_name,
  85.     .version        = LIBAVUTIL_VERSION_INT,
  86.     .category       = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
  87. };
  88.  
  89. AVOutputFormat ff_sndio_muxer = {
  90.     .name           = "sndio",
  91.     .long_name      = NULL_IF_CONFIG_SMALL("sndio audio playback"),
  92.     .priv_data_size = sizeof(SndioData),
  93.     /* XXX: we make the assumption that the soundcard accepts this format */
  94.     /* XXX: find better solution with "preinit" method, needed also in
  95.        other formats */
  96.     .audio_codec    = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
  97.     .video_codec    = AV_CODEC_ID_NONE,
  98.     .write_header   = audio_write_header,
  99.     .write_packet   = audio_write_packet,
  100.     .write_trailer  = audio_write_trailer,
  101.     .flags          = AVFMT_NOFILE,
  102.     .priv_class     = &sndio_muxer_class,
  103. };
  104.