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