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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.  
  27. #include "sndio_common.h"
  28.  
  29. static inline void movecb(void *addr, int delta)
  30. {
  31.     SndioData *s = addr;
  32.  
  33.     s->hwpos += delta * s->channels * s->bps;
  34. }
  35.  
  36. av_cold int ff_sndio_open(AVFormatContext *s1, int is_output,
  37.                           const char *audio_device)
  38. {
  39.     SndioData *s = s1->priv_data;
  40.     struct sio_hdl *hdl;
  41.     struct sio_par par;
  42.  
  43.     hdl = sio_open(audio_device, is_output ? SIO_PLAY : SIO_REC, 0);
  44.     if (!hdl) {
  45.         av_log(s1, AV_LOG_ERROR, "Could not open sndio device\n");
  46.         return AVERROR(EIO);
  47.     }
  48.  
  49.     sio_initpar(&par);
  50.  
  51.     par.bits = 16;
  52.     par.sig  = 1;
  53.     par.le   = SIO_LE_NATIVE;
  54.  
  55.     if (is_output)
  56.         par.pchan = s->channels;
  57.     else
  58.         par.rchan = s->channels;
  59.     par.rate = s->sample_rate;
  60.  
  61.     if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par)) {
  62.         av_log(s1, AV_LOG_ERROR, "Impossible to set sndio parameters, "
  63.                "channels: %d sample rate: %d\n", s->channels, s->sample_rate);
  64.         goto fail;
  65.     }
  66.  
  67.     if (par.bits != 16 || par.sig != 1 ||
  68.         (is_output  && (par.pchan != s->channels)) ||
  69.         (!is_output && (par.rchan != s->channels)) ||
  70.         (par.rate != s->sample_rate)) {
  71.         av_log(s1, AV_LOG_ERROR, "Could not set appropriate sndio parameters, "
  72.                "channels: %d sample rate: %d\n", s->channels, s->sample_rate);
  73.         goto fail;
  74.     }
  75.  
  76.     s->buffer_size = par.round * par.bps *
  77.                      (is_output ? par.pchan : par.rchan);
  78.  
  79.     if (is_output) {
  80.         s->buffer = av_malloc(s->buffer_size);
  81.         if (!s->buffer) {
  82.             av_log(s1, AV_LOG_ERROR, "Could not allocate buffer\n");
  83.             goto fail;
  84.         }
  85.     }
  86.  
  87.     s->codec_id    = par.le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE;
  88.     s->channels    = is_output ? par.pchan : par.rchan;
  89.     s->sample_rate = par.rate;
  90.     s->bps         = par.bps;
  91.  
  92.     sio_onmove(hdl, movecb, s);
  93.  
  94.     if (!sio_start(hdl)) {
  95.         av_log(s1, AV_LOG_ERROR, "Could not start sndio\n");
  96.         goto fail;
  97.     }
  98.  
  99.     s->hdl = hdl;
  100.  
  101.     return 0;
  102.  
  103. fail:
  104.     av_freep(&s->buffer);
  105.  
  106.     if (hdl)
  107.         sio_close(hdl);
  108.  
  109.     return AVERROR(EIO);
  110. }
  111.  
  112. int ff_sndio_close(SndioData *s)
  113. {
  114.     av_freep(&s->buffer);
  115.  
  116.     if (s->hdl)
  117.         sio_close(s->hdl);
  118.  
  119.     return 0;
  120. }
  121.