/* GStreamer

 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>

 *                    2005 Wim Taymans <wim@fluendo.com>

 *

 * gstaudiosink.c: simple audio sink base class

 *

 * 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.

 */

/**

 * SECTION:gstaudiosink

 * @short_description: Simple base class for audio sinks

 * @see_also: #GstBaseAudioSink, #GstRingBuffer, #GstAudioSink.

 *

 * This is the most simple base class for audio sinks that only requires

 * subclasses to implement a set of simple functions:

 *

 * <variablelist>

 *   <varlistentry>

 *     <term>open()</term>

 *     <listitem><para>Open the device.</para></listitem>

 *   </varlistentry>

 *   <varlistentry>

 *     <term>prepare()</term>

 *     <listitem><para>Configure the device with the specified format.</para></listitem>

 *   </varlistentry>

 *   <varlistentry>

 *     <term>write()</term>

 *     <listitem><para>Write samples to the device.</para></listitem>

 *   </varlistentry>

 *   <varlistentry>

 *     <term>reset()</term>

 *     <listitem><para>Unblock writes and flush the device.</para></listitem>

 *   </varlistentry>

 *   <varlistentry>

 *     <term>delay()</term>

 *     <listitem><para>Get the number of samples written but not yet played 

 *     by the device.</para></listitem>

 *   </varlistentry>

 *   <varlistentry>

 *     <term>unprepare()</term>

 *     <listitem><para>Undo operations done by prepare.</para></listitem>

 *   </varlistentry>

 *   <varlistentry>

 *     <term>close()</term>

 *     <listitem><para>Close the device.</para></listitem>

 *   </varlistentry>

 * </variablelist>

 *

 * All scheduling of samples and timestamps is done in this base class

 * together with #GstBaseAudioSink using a default implementation of a

 * #GstRingBuffer that uses threads.

 *

 * Last reviewed on 2006-09-27 (0.10.12)

 */

#include <string.h>

#include "gstaudiosink.h"

GST_DEBUG_CATEGORY_STATIC (gst_audio_sink_debug);

#define GST_CAT_DEFAULT gst_audio_sink_debug

#define GST_TYPE_AUDIORING_BUFFER        \

        (gst_audioringbuffer_get_type())

#define GST_AUDIORING_BUFFER(obj)        \

        (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIORING_BUFFER,GstAudioRingBuffer))

#define GST_AUDIORING_BUFFER_CLASS(klass) \

        (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIORING_BUFFER,GstAudioRingBufferClass))

#define GST_AUDIORING_BUFFER_GET_CLASS(obj) \

        (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_AUDIORING_BUFFER, GstAudioRingBufferClass))

#define GST_AUDIORING_BUFFER_CAST(obj)        \

        ((GstAudioRingBuffer *)obj)

#define GST_IS_AUDIORING_BUFFER(obj)     \

        (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIORING_BUFFER))

#define GST_IS_AUDIORING_BUFFER_CLASS(klass)\

        (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIORING_BUFFER))

typedef struct _GstAudioRingBuffer GstAudioRingBuffer;

typedef struct _GstAudioRingBufferClass GstAudioRingBufferClass;

#define GST_AUDIORING_BUFFER_GET_COND(buf) (((GstAudioRingBuffer *)buf)->cond)

#define GST_AUDIORING_BUFFER_WAIT(buf)     (g_cond_wait (GST_AUDIORING_BUFFER_GET_COND (buf), GST_OBJECT_GET_LOCK (buf)))

#define GST_AUDIORING_BUFFER_SIGNAL(buf)   (g_cond_signal (GST_AUDIORING_BUFFER_GET_COND (buf)))

#define GST_AUDIORING_BUFFER_BROADCAST(buf)(g_cond_broadcast (GST_AUDIORING_BUFFER_GET_COND (buf)))

struct _GstAudioRingBuffer

{

  GstRingBuffer object;

  gboolean running;

  gint queuedseg;

  GCond *cond;

};

struct _GstAudioRingBufferClass

{

  GstRingBufferClass parent_class;

};

static void gst_audioringbuffer_class_init (GstAudioRingBufferClass * klass);

static void gst_audioringbuffer_init (GstAudioRingBuffer * ringbuffer,

    GstAudioRingBufferClass * klass);

static void gst_audioringbuffer_dispose (GObject * object);

static void gst_audioringbuffer_finalize (GObject * object);

static GstRingBufferClass *ring_parent_class = NULL;

static gboolean gst_audioringbuffer_open_device (GstRingBuffer * buf);

static gboolean gst_audioringbuffer_close_device (GstRingBuffer * buf);

static gboolean gst_audioringbuffer_acquire (GstRingBuffer * buf,

    GstRingBufferSpec * spec);

static gboolean gst_audioringbuffer_release (GstRingBuffer * buf);

static gboolean gst_audioringbuffer_start (GstRingBuffer * buf);

static gboolean gst_audioringbuffer_pause (GstRingBuffer * buf);

static gboolean gst_audioringbuffer_stop (GstRingBuffer * buf);

static guint gst_audioringbuffer_delay (GstRingBuffer * buf);

/* ringbuffer abstract base class */

static GType

gst_audioringbuffer_get_type (void)

{

  static GType ringbuffer_type = 0;

  if (!ringbuffer_type) {

    static const GTypeInfo ringbuffer_info = {

      sizeof (GstAudioRingBufferClass),

      NULL,

      NULL,

      (GClassInitFunc) gst_audioringbuffer_class_init,

      NULL,

      NULL,

      sizeof (GstAudioRingBuffer),

      0,

      (GInstanceInitFunc) gst_audioringbuffer_init,

      NULL

    };

    ringbuffer_type =

        g_type_register_static (GST_TYPE_RING_BUFFER, "GstAudioSinkRingBuffer",

        &ringbuffer_info, 0);

  }

  return ringbuffer_type;

}

static void

gst_audioringbuffer_class_init (GstAudioRingBufferClass * klass)

{

  GObjectClass *gobject_class;

  GstObjectClass *gstobject_class;

  GstRingBufferClass *gstringbuffer_class;

  gobject_class = (GObjectClass *) klass;

  gstobject_class = (GstObjectClass *) klass;

  gstringbuffer_class = (GstRingBufferClass *) klass;

  ring_parent_class = g_type_class_peek_parent (klass);

  gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_audioringbuffer_dispose);

  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_audioringbuffer_finalize);

  gstringbuffer_class->open_device =

      GST_DEBUG_FUNCPTR (gst_audioringbuffer_open_device);

  gstringbuffer_class->close_device =

      GST_DEBUG_FUNCPTR (gst_audioringbuffer_close_device);

  gstringbuffer_class->acquire =

      GST_DEBUG_FUNCPTR (gst_audioringbuffer_acquire);

  gstringbuffer_class->release =

      GST_DEBUG_FUNCPTR (gst_audioringbuffer_release);

  gstringbuffer_class->start = GST_DEBUG_FUNCPTR (gst_audioringbuffer_start);

  gstringbuffer_class->pause = GST_DEBUG_FUNCPTR (gst_audioringbuffer_pause);

  gstringbuffer_class->resume = GST_DEBUG_FUNCPTR (gst_audioringbuffer_start);

  gstringbuffer_class->stop = GST_DEBUG_FUNCPTR (gst_audioringbuffer_stop);

  gstringbuffer_class->delay = GST_DEBUG_FUNCPTR (gst_audioringbuffer_delay);

}

typedef guint (*WriteFunc) (GstAudioSink * sink, gpointer data, guint length);

/* this internal thread does nothing else but write samples to the audio device.

 * It will write each segment in the ringbuffer and will update the play

 * pointer. 

 * The start/stop methods control the thread.

 */

static void

audioringbuffer_thread_func (GstRingBuffer * buf)

{

  GstAudioSink *sink;

  GstAudioSinkClass *csink;

  GstAudioRingBuffer *abuf = GST_AUDIORING_BUFFER_CAST (buf);

  WriteFunc writefunc;

  sink = GST_AUDIO_SINK (GST_OBJECT_PARENT (buf));

  csink = GST_AUDIO_SINK_GET_CLASS (sink);

  GST_DEBUG_OBJECT (sink, "enter thread");

  writefunc = csink->write;

  if (writefunc == NULL)

    goto no_function;

  while (TRUE) {

    gint left, len;

    guint8 *readptr;

    gint readseg;

    if (gst_ring_buffer_prepare_read (buf, &readseg, &readptr, &len)) {

      left = len;

      do {

        GST_LOG_OBJECT (sink, "transfered %d bytes of %d from segment %d",

            written, left, readseg);

        if (written < 0 || written > left) {

          GST_WARNING_OBJECT (sink,

          break;

        }

        left -= written;

      } while (left > 0);

      /* clear written samples */

      gst_ring_buffer_clear (buf, readseg);

      /* we wrote one segment */

      gst_ring_buffer_advance (buf, 1);

    } else {

      GST_OBJECT_LOCK (abuf);

      if (!abuf->running)

        goto stop_running;

      GST_DEBUG_OBJECT (sink, "signal wait");

      GST_AUDIORING_BUFFER_SIGNAL (buf);

      GST_DEBUG_OBJECT (sink, "wait for action");

      GST_AUDIORING_BUFFER_WAIT (buf);

      GST_DEBUG_OBJECT (sink, "got signal");

      if (!abuf->running)

        goto stop_running;

      GST_DEBUG_OBJECT (sink, "continue running");

      GST_OBJECT_UNLOCK (abuf);

    }

  }

  return;

  /* ERROR */

no_function:

  {

    GST_DEBUG_OBJECT (sink, "no write function, exit thread");

    return;

  }

stop_running:

  {

    GST_OBJECT_UNLOCK (abuf);

    GST_DEBUG_OBJECT (sink, "stop running, exit thread");

    return;

  }

}

static void

gst_audioringbuffer_init (GstAudioRingBuffer * ringbuffer,

    GstAudioRingBufferClass * g_class)

{

  ringbuffer->running = FALSE;

  ringbuffer->queuedseg = 0;

  ringbuffer->cond = g_cond_new ();

}

static void

gst_audioringbuffer_dispose (GObject * object)

{

  G_OBJECT_CLASS (ring_parent_class)->dispose (object);

}

static void

gst_audioringbuffer_finalize (GObject * object)

{

  GstAudioRingBuffer *ringbuffer = GST_AUDIORING_BUFFER_CAST (object);

  g_cond_free (ringbuffer->cond);

  G_OBJECT_CLASS (ring_parent_class)->finalize (object);

}

static gboolean

gst_audioringbuffer_open_device (GstRingBuffer * buf)

{

  GstAudioSink *sink;

  GstAudioSinkClass *csink;

  gboolean result = TRUE;

  sink = GST_AUDIO_SINK (GST_OBJECT_PARENT (buf));

  csink = GST_AUDIO_SINK_GET_CLASS (sink);

  if (csink->open)

    result = csink->open (sink);

  if (!result)

    goto could_not_open;

  return result;

could_not_open:

  {

    GST_DEBUG_OBJECT (sink, "could not open device");

    return FALSE;

  }

}

static gboolean

gst_audioringbuffer_close_device (GstRingBuffer * buf)

{

  GstAudioSink *sink;

  GstAudioSinkClass *csink;

  gboolean result = TRUE;

  sink = GST_AUDIO_SINK (GST_OBJECT_PARENT (buf));

  csink = GST_AUDIO_SINK_GET_CLASS (sink);

  if (csink->close)

    result = csink->close (sink);

  if (!result)

    goto could_not_close;

  return result;

could_not_close:

  {

    GST_DEBUG_OBJECT (sink, "could not close device");

    return FALSE;

  }

}

static gboolean

gst_audioringbuffer_acquire (GstRingBuffer * buf, GstRingBufferSpec * spec)

{

  GstAudioSink *sink;

  GstAudioSinkClass *csink;

  gboolean result = FALSE;

  sink = GST_AUDIO_SINK (GST_OBJECT_PARENT (buf));

  csink = GST_AUDIO_SINK_GET_CLASS (sink);

  if (csink->prepare)

    result = csink->prepare (sink, spec);

  if (!result)

    goto could_not_prepare;

  buf->data = gst_buffer_new_and_alloc (spec->segtotal * spec->segsize);

  memset (GST_BUFFER_DATA (buf->data), 0, GST_BUFFER_SIZE (buf->data));

could_not_prepare:

  {

    GST_DEBUG_OBJECT (sink, "could not prepare device");

    return FALSE;

  }

}

/* function is called with LOCK */

static gboolean

gst_audioringbuffer_release (GstRingBuffer * buf)

{

  GstAudioSink *sink;

  GstAudioSinkClass *csink;

  GstAudioRingBuffer *abuf;

  gboolean result = FALSE;

  sink = GST_AUDIO_SINK (GST_OBJECT_PARENT (buf));

  csink = GST_AUDIO_SINK_GET_CLASS (sink);

  abuf = GST_AUDIORING_BUFFER_CAST (buf);

  /* free the buffer */

  gst_buffer_unref (buf->data);

  buf->data = NULL;

  if (csink->unprepare)

    result = csink->unprepare (sink);

  if (!result)

    goto could_not_unprepare;

  return result;

could_not_unprepare:

  {

    GST_DEBUG_OBJECT (sink, "could not unprepare device");

    return FALSE;

  }

}

static gboolean

gst_audioringbuffer_start (GstRingBuffer * buf)

{

  GstAudioSink *sink;

  sink = GST_AUDIO_SINK (GST_OBJECT_PARENT (buf));

  GST_DEBUG_OBJECT (sink, "start, sending signal");

  GST_AUDIORING_BUFFER_SIGNAL (buf);

  return TRUE;

}

static gboolean

gst_audioringbuffer_pause (GstRingBuffer * buf)

{

  GstAudioSink *sink;

  GstAudioSinkClass *csink;

  sink = GST_AUDIO_SINK (GST_OBJECT_PARENT (buf));

  csink = GST_AUDIO_SINK_GET_CLASS (sink);

  /* unblock any pending writes to the audio device */

  if (csink->reset) {

    GST_DEBUG_OBJECT (sink, "reset...");

    csink->reset (sink);