/*
 * GStreamer
 * Copyright (C) 2006 Zaheer Abbas Merali <zaheerabbas at merali dot org>
 * Copyright (C) 2008 Pioneers of the Inevitable <songbird@songbirdnest.com>
 * Copyright (C) 2012 Fluendo S.A. <support@fluendo.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Alternatively, the contents of this file may be used under the
 * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
 * which case the following provisions apply instead of the ones
 * mentioned above:
 *
 * 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., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include <gst/gst.h>
#include <glib/gi18n-lib.h>
#include <gst/audio/audio-channels.h>
#include "gstosxaudioringbuffer.h"
#include "gstosxaudiosink.h"
#include "gstosxaudiosrc.h"

#include <unistd.h>             /* for getpid() */

GST_DEBUG_CATEGORY_STATIC (osx_audio_debug);
#define GST_CAT_DEFAULT osx_audio_debug

#include "gstosxcoreaudio.h"

static void gst_osx_audio_ring_buffer_dispose (GObject * object);
static gboolean gst_osx_audio_ring_buffer_open_device (GstAudioRingBuffer *
    buf);
static gboolean gst_osx_audio_ring_buffer_close_device (GstAudioRingBuffer *
    buf);

static gboolean gst_osx_audio_ring_buffer_acquire (GstAudioRingBuffer * buf,
    GstAudioRingBufferSpec * spec);
static gboolean gst_osx_audio_ring_buffer_release (GstAudioRingBuffer * buf);

static gboolean gst_osx_audio_ring_buffer_start (GstAudioRingBuffer * buf);
static gboolean gst_osx_audio_ring_buffer_pause (GstAudioRingBuffer * buf);
static gboolean gst_osx_audio_ring_buffer_stop (GstAudioRingBuffer * buf);
static guint gst_osx_audio_ring_buffer_delay (GstAudioRingBuffer * buf);
static GstAudioRingBufferClass *ring_parent_class = NULL;

#define gst_osx_audio_ring_buffer_do_init \
  GST_DEBUG_CATEGORY_INIT (osx_audio_debug, "osxaudio", 0, "OSX Audio Elements");

G_DEFINE_TYPE_WITH_CODE (GstOsxAudioRingBuffer, gst_osx_audio_ring_buffer,
    GST_TYPE_AUDIO_RING_BUFFER, gst_osx_audio_ring_buffer_do_init);

static void
gst_osx_audio_ring_buffer_class_init (GstOsxAudioRingBufferClass * klass)
{
  GObjectClass *gobject_class;
  GstAudioRingBufferClass *gstringbuffer_class;

  gobject_class = (GObjectClass *) klass;
  gstringbuffer_class = (GstAudioRingBufferClass *) klass;

  ring_parent_class = g_type_class_peek_parent (klass);

  gobject_class->dispose = gst_osx_audio_ring_buffer_dispose;

  gstringbuffer_class->open_device =
      GST_DEBUG_FUNCPTR (gst_osx_audio_ring_buffer_open_device);
  gstringbuffer_class->close_device =
      GST_DEBUG_FUNCPTR (gst_osx_audio_ring_buffer_close_device);
  gstringbuffer_class->acquire =
      GST_DEBUG_FUNCPTR (gst_osx_audio_ring_buffer_acquire);
  gstringbuffer_class->release =
      GST_DEBUG_FUNCPTR (gst_osx_audio_ring_buffer_release);
  gstringbuffer_class->start =
      GST_DEBUG_FUNCPTR (gst_osx_audio_ring_buffer_start);
  gstringbuffer_class->pause =
      GST_DEBUG_FUNCPTR (gst_osx_audio_ring_buffer_pause);
  gstringbuffer_class->resume =
      GST_DEBUG_FUNCPTR (gst_osx_audio_ring_buffer_start);
  gstringbuffer_class->stop =
      GST_DEBUG_FUNCPTR (gst_osx_audio_ring_buffer_stop);
  gstringbuffer_class->delay =
      GST_DEBUG_FUNCPTR (gst_osx_audio_ring_buffer_delay);

  GST_DEBUG ("osx audio ring buffer class init");
}

static void
gst_osx_audio_ring_buffer_init (GstOsxAudioRingBuffer * ringbuffer)
{
}

static void
gst_osx_audio_ring_buffer_dispose (GObject * object)
{
  GstOsxAudioRingBuffer *osxbuf;

  osxbuf = GST_OSX_AUDIO_RING_BUFFER (object);

  g_clear_object (&osxbuf->core_audio);
  G_OBJECT_CLASS (ring_parent_class)->dispose (object);
}

static gboolean
gst_osx_audio_ring_buffer_open_device (GstAudioRingBuffer * buf)
{
  GstObject *osxel = GST_OBJECT_PARENT (buf);
  GstOsxAudioRingBuffer *osxbuf = GST_OSX_AUDIO_RING_BUFFER (buf);

  if (!gst_core_audio_select_device (osxbuf->core_audio)) {
    GST_ELEMENT_ERROR (osxel, RESOURCE, NOT_FOUND,
        (_("CoreAudio device not found")), (NULL));
    return FALSE;
  }

  if (!gst_core_audio_open (osxbuf->core_audio)) {
    GST_ELEMENT_ERROR (osxel, RESOURCE, OPEN_READ,
        (_("CoreAudio device could not be opened")), (NULL));
    return FALSE;
  }

  return TRUE;
}

static gboolean
gst_osx_audio_ring_buffer_close_device (GstAudioRingBuffer * buf)
{
  GstOsxAudioRingBuffer *osxbuf;
  osxbuf = GST_OSX_AUDIO_RING_BUFFER (buf);

  return gst_core_audio_close (osxbuf->core_audio);
}

static gboolean
gst_osx_audio_ring_buffer_acquire (GstAudioRingBuffer * buf,
    GstAudioRingBufferSpec * spec)
{
  gboolean ret = FALSE, is_passthrough = FALSE;
  GstOsxAudioRingBuffer *osxbuf = GST_OSX_AUDIO_RING_BUFFER (buf);
  AudioStreamBasicDescription format = { 0 };
  guint32 frames_per_packet = 0;

  if (RINGBUFFER_IS_SPDIF (spec->type)) {
    format.mFormatID = kAudioFormat60958AC3;
    format.mSampleRate = (double) GST_AUDIO_INFO_RATE (&spec->info);
    format.mChannelsPerFrame = 2;
    format.mFormatFlags = kAudioFormatFlagIsSignedInteger |
        kAudioFormatFlagIsPacked | kAudioFormatFlagIsNonMixable;
    format.mBytesPerFrame = 0;
    format.mBitsPerChannel = 16;
    format.mBytesPerPacket = 6144;
    format.mFramesPerPacket = 1536;
    format.mReserved = 0;
    spec->segsize = 6144;
    spec->segtotal = 10;
    is_passthrough = TRUE;
  } else {
    int width, depth;
    /* Fill out the audio description we're going to be using */
    format.mFormatID = kAudioFormatLinearPCM;
    format.mSampleRate = (double) GST_AUDIO_INFO_RATE (&spec->info);
    format.mChannelsPerFrame = GST_AUDIO_INFO_CHANNELS (&spec->info);
    if (GST_AUDIO_INFO_IS_FLOAT (&spec->info)) {
      format.mFormatFlags = kAudioFormatFlagsNativeFloatPacked;
      width = depth = GST_AUDIO_INFO_WIDTH (&spec->info);
    } else {
      format.mFormatFlags = kAudioFormatFlagIsSignedInteger;
      width = GST_AUDIO_INFO_WIDTH (&spec->info);
      depth = GST_AUDIO_INFO_DEPTH (&spec->info);
      if (width == depth) {
        format.mFormatFlags |= kAudioFormatFlagIsPacked;
      } else {
        format.mFormatFlags |= kAudioFormatFlagIsAlignedHigh;
      }
    }

    if (GST_AUDIO_INFO_IS_BIG_ENDIAN (&spec->info)) {
      format.mFormatFlags |= kAudioFormatFlagIsBigEndian;
    }

    format.mBytesPerFrame = GST_AUDIO_INFO_BPF (&spec->info);
    format.mBitsPerChannel = depth;
    format.mBytesPerPacket = GST_AUDIO_INFO_BPF (&spec->info);
    format.mFramesPerPacket = 1;
    format.mReserved = 0;
    spec->segsize =
        (spec->latency_time * GST_AUDIO_INFO_RATE (&spec->info) /
        G_USEC_PER_SEC) * GST_AUDIO_INFO_BPF (&spec->info);
    spec->segtotal = spec->buffer_time / spec->latency_time;
    frames_per_packet = spec->segsize / GST_AUDIO_INFO_BPF (&spec->info);

    is_passthrough = FALSE;
  }

  GST_DEBUG_OBJECT (osxbuf, "Format: " CORE_AUDIO_FORMAT,
      CORE_AUDIO_FORMAT_ARGS (format));

  /* gst_audio_ring_buffer_set_channel_positions is not called
   * since the AUs perform channel reordering themselves.
   * (see gst_core_audio_set_channel_layout) */

  buf->size = spec->segtotal * spec->segsize;
  buf->memory = g_malloc0 (buf->size);

  ret = gst_core_audio_initialize (osxbuf->core_audio, format, spec->caps,
      frames_per_packet, is_passthrough);

  if (!ret) {
    g_free (buf->memory);
    buf->memory = NULL;
    buf->size = 0;
  }

  osxbuf->segoffset = 0;

  return ret;
}

static gboolean
gst_osx_audio_ring_buffer_release (GstAudioRingBuffer * buf)
{
  GstOsxAudioRingBuffer *osxbuf;

  osxbuf = GST_OSX_AUDIO_RING_BUFFER (buf);

  gst_core_audio_uninitialize (osxbuf->core_audio);

  g_free (buf->memory);
  buf->memory = NULL;
  buf->size = 0;

  return TRUE;
}

static gboolean
gst_osx_audio_ring_buffer_start (GstAudioRingBuffer * buf)
{
  GstOsxAudioRingBuffer *osxbuf;

  osxbuf = GST_OSX_AUDIO_RING_BUFFER (buf);

  return gst_core_audio_start_processing (osxbuf->core_audio);
}

static gboolean
gst_osx_audio_ring_buffer_pause (GstAudioRingBuffer * buf)
{
  GstOsxAudioRingBuffer *osxbuf = GST_OSX_AUDIO_RING_BUFFER (buf);

  return gst_core_audio_pause_processing (osxbuf->core_audio);
}


static gboolean
gst_osx_audio_ring_buffer_stop (GstAudioRingBuffer * buf)
{
  GstOsxAudioRingBuffer *osxbuf;

  osxbuf = GST_OSX_AUDIO_RING_BUFFER (buf);

  gst_core_audio_stop_processing (osxbuf->core_audio);

  return TRUE;
}

static guint
gst_osx_audio_ring_buffer_delay (GstAudioRingBuffer * buf)
{
  GstOsxAudioRingBuffer *osxbuf;
  double latency;
  guint samples;

  osxbuf = GST_OSX_AUDIO_RING_BUFFER (buf);

  if (!gst_core_audio_get_samples_and_latency (osxbuf->core_audio,
          GST_AUDIO_INFO_RATE (&buf->spec.info), &samples, &latency)) {
    return 0;
  }
  GST_DEBUG_OBJECT (buf, "Got latency: %f seconds -> %d samples",
      latency, samples);
  return samples;
}
