/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            audiobackend-alsa.cc
 *
 *  Wed Sep 24 07:47:43 CEST 2014
 *  Copyright 2014 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of SimpleRTP.
 *
 *  SimpleRTP is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  SimpleRTP is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with SimpleRTP; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "audiobackend-alsa.h"

#include <memory.h>

#include "mediaconfig.h"

AudioBackendAlsa::AudioBackendAlsa(const char *device)
{
  //
  // LibAO:
  //
  ao_initialize();

  ao_sample_format sf;
  memset(&sf, 0, sizeof(sf));
  sf.bits = 16;
  sf.rate = SAMPLERATE;
  sf.channels = 1;
  sf.byte_format = AO_FMT_NATIVE;

  dev = ao_open_live(ao_default_driver_id(), &sf, 0);

  //
  // LibAudioIn:
  //
  int err;
  ai = ai_init(&err, device, "", SAMPLERATE, 1);
  if(ai == NULL || err) {
    printf("ai_init: %d (device: %s)\n", err, device);
    exit(1);
    return;
  }
  
  int srate = ai_get_samplerate(&err, ai);
  if(err) printf("ai_get_samplerate: %d\n", err);
  if(srate != SAMPLERATE) {
    printf("Samplerate: %d\n", srate);
  }
}

AudioBackendAlsa::~AudioBackendAlsa()
{
  //
  // LibAO:
  //
  ao_close(dev);
  ao_shutdown();

  //
  // LibAudioIn:
  //
  if(ai == NULL) {
    printf("ai_err: no handle\n");
    return;
  }

  int err;
  ai_close(&err, ai);
  if(err) printf("ai_err: %d\n", err);
}

int AudioBackendAlsa::read(char *pcm, size_t maxsize)
{
  //
  // LibAudioIn:
  //
  if(ai == NULL) {
    printf("ai_err: no handle\n");
    return 0;
  }

  int err;
  int ret = ai_read(&err, ai, pcm, maxsize);
  if(err) printf("ai_read: %d\n", err);
  return ret;
}

int AudioBackendAlsa::write(const char *pcm, size_t size)
{
  //
  // LibAO:
  //
  ao_play(dev, (char *)pcm, size);
  return 0;
}