/*

 * GStreamer

 * Copyright (C) 2012 Fluendo S.A. <support@fluendo.com>

 *   Authors: Andoni Morales Alastruey <amorales@fluendo.com>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library 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

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public

 * License along with this library; if not, write to the

 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 *

 */

#import <AudioUnit/AUComponent.h>

static gboolean

gst_core_audio_open_impl (GstCoreAudio * core_audio)

{

  return gst_core_audio_open_device (core_audio, kAudioUnitSubType_RemoteIO,

      "RemoteIO");

}

static gboolean

gst_core_audio_start_processing_impl (GstCoreAudio * core_audio)

{

  return gst_core_audio_io_proc_start (core_audio);

}

static gboolean

gst_core_audio_pause_processing_impl (GstCoreAudio * core_audio)

{

  GST_DEBUG_OBJECT (core_audio,

      "osx ring buffer pause ioproc: %p device_id %lu",

      core_audio->element->io_proc, (gulong) core_audio->device_id);

  if (core_audio->io_proc_active) {

    /* CoreAudio isn't threadsafe enough to do this here;

     * we must deactivate the render callback elsewhere. See:

     * http://lists.apple.com/archives/Coreaudio-api/2006/Mar/msg00010.html

     */

    core_audio->io_proc_needs_deactivation = TRUE;

  }

  return TRUE;

}

static gboolean

gst_core_audio_stop_processing_impl (GstCoreAudio * core_audio)

{

  gst_core_audio_io_proc_stop (core_audio);

  return TRUE;

}

static gboolean

gst_core_audio_get_samples_and_latency_impl (GstCoreAudio * core_audio,

    gdouble rate, guint * samples, gdouble * latency)

{

  OSStatus status;

  UInt32 size = sizeof (double);

  status = AudioUnitGetProperty (core_audio->audiounit, kAudioUnitProperty_Latency, kAudioUnitScope_Global, 0,  /* N/A for global */

      latency, &size);

  if (status) {

    GST_WARNING_OBJECT (core_audio, "Failed to get latency: %d", (int) status);

    *samples = 0;

    return FALSE;

  }

  *samples = *latency * rate;

  return TRUE;

}

static gboolean

gst_core_audio_initialize_impl (GstCoreAudio * core_audio,

    AudioStreamBasicDescription format, GstCaps * caps,

    gboolean is_passthrough, guint32 * frame_size)

{

  gboolean ret = FALSE;

  OSStatus status;

  /* Uninitialize the AudioUnit before changing formats */

  status = AudioUnitUninitialize (core_audio->audiounit);

  if (status) {

    GST_ERROR_OBJECT (core_audio, "Failed to uninitialize AudioUnit: %d",

        (int) status);

    return FALSE;

  }

  core_audio->is_passthrough = is_passthrough;

  core_audio->stream_idx = 0;

  if (!gst_core_audio_set_format (core_audio, format))

    goto done;

  /* FIXME: Use kAudioSessionProperty_CurrentHardwareSampleRate and

   * kAudioSessionProperty_CurrentHardwareIOBufferDuration with property

   * listeners to detect changes in screen locks.

   * For now use the maximum value */

  *frame_size = 4196;

  GST_DEBUG_OBJECT (core_audio, "osxbuf ring buffer acquired");

  ret = TRUE;

done:

  /* Format changed, initialise the AudioUnit again */

  status = AudioUnitInitialize (core_audio->audiounit);

  if (status) {

    GST_ERROR_OBJECT (core_audio, "Failed to initialize AudioUnit: %d",

        (int) status);

    ret = FALSE;

  }

  return ret;

}

static gboolean

gst_core_audio_select_device_impl (GstCoreAudio * core_audio)

{

  /* No device selection in iOS */

  return TRUE;

}

static gboolean

gst_core_audio_audio_device_is_spdif_avail_impl (AudioDeviceID device_id)

{

  /* No SPDIF in iOS */

  return FALSE;

}