/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/***************************************************************************
 *            audioio.cc
 *
 *  Thu Sep 25 15:55:14 CEST 2014
 *  Copyright 2014 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of LibAudioIO.
 *
 *  LibAudioIO is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *  
 *  LibAudioIO 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
 *  Lesser General Public License for more details.
 *  
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with LibAudioIO; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
#include "audioio.h"

#include "device.h"
#include "mixer.h"
#include "source.h"
#include "sink.h"

#ifdef __cplusplus
extern "C" {
#endif

/*
#define NO_ERROR                     0

#define OUT_OF_MEMORY              -101
#define MISSING_HANDLE             -102

#define COULD_NOT_OPEN_DEVICE      -203
#define COULD_NOT_SET_HW_PARAMS    -204
#define COULD_NOT_INIT_PARAMS      -205
#define COULD_NOT_SET_ACCESS_MODE  -206
#define COULD_NOT_SET_FORMAT       -207
#define COULD_NOT_SET_CHANNELS     -208
#define COULD_NOT_SET_SAMPLE_RATE  -209
#define COULD_NOT_SET_PERIOD_SIZE  -210

#define BUFFER_TOO_SMALL           -305
#define BUFFER_OVERRUN             -306
#define READ_ERROR                 -307
#define SHORT_READ                 -308

#define MIXER_INIT_FAILED          -400

#define MIXER_NOT_INITIALISED      -401
#define INVALID_MIXER_LEVEL        -402
#define INVALID_CHANNEL_NUMBER     -403
#define COULD_NOT_SET_MIXER_LEVEL  -404
*/

#define MAGIC 0xdeadbeef

struct aio_t {
  unsigned int magic;

  Device *device;

  Source *source;
  Mixer *source_mixer;

  Sink *sink;
  Mixer *sink_mixer;
};

// Check if 'h' is a valid aio_t handle and report/return error if not.
#define CHECK_HANDLE(h)                            \
  do {                                             \
    if(!h || h->magic != MAGIC) {                  \
      return MISSING_HANDLE;                       \
    }                                              \
  } while(0)
  
struct aio_t *aio_init(int *err,
                       const char *playback_device,
                       const char *playback_mixer,
                       const char *capture_device,
                       const char *capture_mixer,
                       unsigned int samplerate,
                       unsigned int channels)
{
  *err = NO_ERROR;

  const char *device = playback_device;
  if(device == NULL || strlen(device) == 0) device = capture_device;
  if(device == NULL || strlen(device) == 0) {
    *err = COULD_NOT_OPEN_DEVICE;
    return NULL;
  }

  struct aio_t *h = new aio_t;
  memset(h, 0, sizeof(struct aio_t));
  h->magic = MAGIC;
  

  if(h == NULL) {
    *err = OUT_OF_MEMORY;
    return NULL;
  }

  h->device = new Device(device);

  if(playback_device != NULL && strlen(playback_device) > 0) {
    h->sink = h->device->getSink(playback_device, samplerate, channels);
    if(h->sink == NULL) {
      *err = COULD_NOT_OPEN_DEVICE;
    }
  }

  if(playback_mixer != NULL && strlen(playback_mixer) > 0) {
    h->sink_mixer = h->device->getMixer(playback_mixer);
    if(h->sink_mixer == NULL) {
      *err = MIXER_INIT_FAILED;
    }
  }

  if(capture_device != NULL && strlen(capture_device) > 0) {
    h->source = h->device->getSource(capture_device, samplerate, channels);
    if(h->sink == NULL) {
      *err = COULD_NOT_OPEN_DEVICE;
    }
  }

  if(capture_mixer != NULL && strlen(capture_mixer) > 0) {
    h->source_mixer = h->device->getMixer(capture_mixer);
    if(h->source_mixer == NULL) {
      *err = MIXER_INIT_FAILED;
    }
  }

  if(*err != NO_ERROR) {
    h->magic = 0;
    if(h->source) delete h->source;
    if(h->source_mixer) delete h->source_mixer;
    if(h->sink) delete h->sink;
    if(h->sink_mixer) delete h->sink_mixer;
    delete h;
    return NULL;
  }

  return h;
}

int aio_read(struct aio_t *h, char *pcm, unsigned int maxsize)
{
  CHECK_HANDLE(h);

  if(h->source) {
    return h->source->readSamples(pcm, maxsize);
  }

  return MISSING_HANDLE;
}

int aio_write(struct aio_t *h, const char *pcm, unsigned int size)
{
  CHECK_HANDLE(h);

  if(h->sink) {
    return h->sink->writeSamples(pcm, size);
  }

  return MISSING_HANDLE;
}

int aio_set_playback_mixer_level(struct aio_t *h, unsigned int c, float level)
{
  CHECK_HANDLE(h);

  if(h->sink_mixer) {
    h->sink_mixer->setLevel(c, level);
    return 0;
  }

  return MISSING_HANDLE;
}

int aio_get_playback_mixer_level(struct aio_t *h, unsigned int c, float *level)
{
  CHECK_HANDLE(h);

  if(h->sink_mixer) {
    float l = h->sink_mixer->level(c);
    if(l < -1000) return INVALID_MIXER_LEVEL;
    *level = l;
    return 0;
  }

  return MISSING_HANDLE;
}

int aio_get_playback_mixer_level_range(struct aio_t *h, float *min, float *max)
{
  CHECK_HANDLE(h);

  if(h->sink_mixer) {
    Mixer::range_t r = h->sink_mixer->range();
    *min = r.min;
    *max = r.max;
    return 0;
  }

  return MISSING_HANDLE;
}

int aio_set_capture_mixer_level(struct aio_t *h, unsigned int c, float level)
{
  CHECK_HANDLE(h);

  if(h->source_mixer) {
    h->source_mixer->setLevel(c, level);
    return 0;
  }

  return MISSING_HANDLE;
}

int aio_get_capture_mixer_level(struct aio_t *h, unsigned int c, float *level)
{
  CHECK_HANDLE(h);

  if(h->source_mixer) {
    float l = h->source_mixer->level(c);
    if(l < -1000) return INVALID_MIXER_LEVEL;
    *level = l;
    return 0;
  }

  return MISSING_HANDLE;
}

int aio_get_capture_mixer_level_range(struct aio_t *h, float *min, float *max)
{
  CHECK_HANDLE(h);

  if(h->source_mixer) {
    Mixer::range_t r = h->source_mixer->range();
    *min = r.min;
    *max = r.max;
    return 0;
  }

  return MISSING_HANDLE;
}

int aio_get_samplerate(struct aio_t *h)
{
  CHECK_HANDLE(h);

  if(h->source) return h->source->samplerate();
  else if(h->sink) return h->sink->samplerate();
    
  return MISSING_HANDLE;
}

int aio_close(struct aio_t *h)
{
  CHECK_HANDLE(h);

  h->magic = 0;
  if(h->source) delete h->source;
  if(h->source_mixer) delete h->source_mixer;
  if(h->sink) delete h->sink;
  if(h->sink_mixer) delete h->sink_mixer;
  delete h;

  return 0;
}

#ifdef __cplusplus
}
#endif