/* concat muxer plugin for GStreamer
 * Copyright (C) 2004 Renato Filhps <renato.filho@indt.org.br>
 *
 * 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:element-concatmux
 * @short_description: Concat that takes one or several digital streams
 * and muxes them to a single stream.
 *
 * <refsect2>
 * <title>Sample pipelines</title>
 * <para>
 * Here is a simple pipeline to concat 2 files into a another file:
 * <programlisting>
 * gst-launch concatmux name=m ! filesink location=output.txt  filesrc location=file_a.txt !  m. filesrc location=file_b.txt ! m.
 * </programlisting>
 * </para>
 * </refsect2>
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gst/gst.h>
#include <gst/base/gstcollectpads.h>

#include <string.h>

GST_DEBUG_CATEGORY_STATIC(gst_concat_mux_debug);
#define GST_CAT_DEFAULT gst_concat_mux_debug

#define GST_TYPE_CONCAT_MUX (gst_concat_mux_get_type())
#define GST_CONCAT_MUX(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CONCAT_MUX, GstConcatMux))
#define GST_CONCAT_MUX_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CONCAT_MUX, GstConcatMux))
#define GST_IS_CONCAT_MUX(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CONCAT_MUX))
#define GST_IS_CONCAT_MUX_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CONCAT_MUX))

typedef struct _GstConcatMux GstConcatMux;
typedef struct _GstConcatMuxClass GstConcatMuxClass;

/**
 * GstConcatMux:
 *
 * The opaque #GstConcatMux structure.
 */
struct _GstConcatMux
{
  GstElement element;

 /* Caps */
  GstCaps *sink_caps;

 /* pad */
  GstPad *srcpad;
  GstPad *sinkpad;

 /* sinkpads */
  GSList *sinks;
  gint numpads;

 /* offset in stream */
  guint64 offset;
  guint64 timeoffset;
  guint64 start_time;

  gboolean negotiated;
  gboolean resync;
  gboolean done;
};

struct _GstConcatMuxClass
{
  GstElementClass parent_class;
};

/* elementfactory information */
static const GstElementDetails gst_concat_mux_details =
GST_ELEMENT_DETAILS("Concat muxer",
					"Codec/Muxer",
					"mux concat streams",
					"Renato Filho <renato.filho@indt.org>");

static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE("src",
																  GST_PAD_SRC,
																  GST_PAD_ALWAYS,
																  GST_STATIC_CAPS_ANY);

static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE("sink_%d",
																   GST_PAD_SINK,
																   GST_PAD_REQUEST,
																   GST_STATIC_CAPS_ANY);

static void gst_concat_mux_base_init(gpointer g_class);
static void gst_concat_mux_class_init(GstConcatMuxClass * klass);
static void gst_concat_mux_init(GstConcatMux * concat_mux);

static void gst_concat_mux_finalize(GObject * object);

static gboolean gst_concat_mux_handle_src_event(GstPad * pad,
												GstEvent * event);
static gboolean gst_concat_mux_handle_sink_event(GstPad * pad,
												 GstEvent * event);

static GstPad *gst_concat_mux_request_new_pad(GstElement * element,
											  GstPadTemplate * templ,
											  const gchar * name);
static GstStateChangeReturn gst_concat_mux_change_state(GstElement * element,
														GstStateChange
														transition);

static GstFlowReturn gst_concat_mux_chain(GstPad * pad, GstBuffer * buf);
static void gst_concat_mux_clear(GstConcatMux * mux);


static GstElementClass *parent_class = NULL;

GType
gst_concat_mux_get_type(void)
{
  static GType concat_mux_type = 0;

  if (!concat_mux_type)
	{
	  static const GTypeInfo concat_mux_info = {
		sizeof(GstConcatMuxClass),
		gst_concat_mux_base_init,
		NULL,
		(GClassInitFunc) gst_concat_mux_class_init,
		NULL,
		NULL,
		sizeof(GstConcatMux),
		0,
		(GInstanceInitFunc) gst_concat_mux_init,
	  };

	  concat_mux_type =
		g_type_register_static(GST_TYPE_ELEMENT, "GstConcatMux",
							   &concat_mux_info, 0);
	}
  return concat_mux_type;
}

static void
gst_concat_mux_base_init(gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS(g_class);

  gst_element_class_add_pad_template(element_class,
									 gst_static_pad_template_get
									 (&src_factory));
  gst_element_class_add_pad_template(element_class,
									 gst_static_pad_template_get
									 (&sink_factory));

  gst_element_class_set_details(element_class, &gst_concat_mux_details);
}

static void
gst_concat_mux_class_init(GstConcatMuxClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;

  parent_class = g_type_class_peek_parent(klass);

  gobject_class->finalize = gst_concat_mux_finalize;

  gstelement_class->request_new_pad = gst_concat_mux_request_new_pad;
  gstelement_class->change_state = gst_concat_mux_change_state;
}

static void
gst_concat_mux_init(GstConcatMux * concat_mux)
{
  GstElementClass *klass = GST_ELEMENT_GET_CLASS(concat_mux);

  concat_mux->srcpad =
	gst_pad_new_from_template(gst_element_class_get_pad_template(klass,
																 "src"),
							  "src");
  gst_pad_set_event_function(concat_mux->srcpad,
							 gst_concat_mux_handle_src_event);
  gst_element_add_pad(GST_ELEMENT(concat_mux), concat_mux->srcpad);
}

static void
gst_concat_mux_finalize(GObject * object)
{
  GstConcatMux *concat_mux;

  concat_mux = GST_CONCAT_MUX(object);
  gst_concat_mux_clear(GST_CONCAT_MUX(object));

  G_OBJECT_CLASS(parent_class)->finalize(object);
}

static void
gst_concat_mux_free_pad(gpointer data, gpointer user_data)
{
  GMutex *mux;

  mux = gst_pad_get_element_private(GST_PAD(data));
  g_mutex_unlock(mux);
  g_mutex_free(mux);
  gst_object_unref(GST_OBJECT(data));
}

static void
gst_concat_mux_clear(GstConcatMux * mux)
{
  mux->resync = TRUE;
  mux->timeoffset = 0;
  mux->offset = 0;
  mux->negotiated = FALSE;
  mux->done = TRUE;
  if (mux->sinks != NULL)
	{
	  g_slist_foreach(mux->sinks, gst_concat_mux_free_pad, mux);
	  g_slist_free(mux->sinks);
	  mux->sinks = NULL;
	}
}


static GstPadLinkReturn
gst_concat_mux_sinkconnect(GstPad * pad, GstPad * peer)
{
  gchar *pad_name = NULL;
  GstConcatMux *concat_mux;

  concat_mux = GST_CONCAT_MUX(gst_pad_get_parent(pad));

  if (concat_mux->sink_caps != NULL)
	{
	  GstCaps *peer_caps = gst_pad_get_caps(peer);
	  GstCaps *intersect;

	  intersect = gst_caps_intersect(concat_mux->sink_caps, peer_caps);
	  if (intersect == NULL)
		{
		  gst_caps_unref(peer_caps);
		  return GST_PAD_LINK_NOFORMAT;
		}
	  gst_caps_unref(peer_caps);
	  gst_caps_unref(intersect);
	}
  else
	{
	  concat_mux->sink_caps = gst_pad_get_caps(pad);
	}

  pad_name = gst_pad_get_name(pad);

  GST_DEBUG_OBJECT(concat_mux, "sinkconnect triggered on %s", pad_name);

  g_free(pad_name);

  gst_object_unref(concat_mux);

  return GST_PAD_LINK_OK;
}

static GstPad *
gst_concat_mux_request_new_pad(GstElement * element,
							   GstPadTemplate * templ, const gchar * req_name)
{
  GstConcatMux *concat_mux;
  GstPad *newpad;
  GstElementClass *klass = GST_ELEMENT_GET_CLASS(element);
  GMutex *mutex;

  g_return_val_if_fail(templ != NULL, NULL);

  if (templ->direction != GST_PAD_SINK)
	{
	  g_warning("concat_mux: request pad that is not a SINK pad\n");
	  return NULL;
	}

  g_return_val_if_fail(GST_IS_CONCAT_MUX(element), NULL);

  concat_mux = GST_CONCAT_MUX(element);

  if (templ == gst_element_class_get_pad_template(klass, "sink_%d"))
	{
	  gchar *name;

	 /* create new pad with the name */
	  name = g_strdup_printf("sink_%02d", concat_mux->numpads);
	  g_debug("NEw pad %s", name);
	  newpad = gst_pad_new_from_template(templ, name);
	  g_free(name);
	  concat_mux->sinks = g_slist_append(concat_mux->sinks, newpad);
	  g_debug("New sink %p / %d", newpad, g_slist_length(concat_mux->sinks));
	  concat_mux->numpads++;
	}
  else
	{
	  g_warning("concat_mux: this is not our template!\n");
	  return NULL;
	}

  mutex = g_mutex_new();

  if (concat_mux->sinkpad == NULL)
	{
	  concat_mux->sinkpad = newpad;
	}
  else
	{
	  g_mutex_lock(mutex);
	}

  gst_pad_set_element_private(newpad, mutex);
 /* setup some pad functions */
  gst_pad_set_link_function(newpad, gst_concat_mux_sinkconnect);
  gst_pad_set_event_function(newpad, gst_concat_mux_handle_sink_event);
  gst_pad_set_chain_function(newpad, gst_concat_mux_chain);

 /* add the pad to the element */
  gst_element_add_pad(element, newpad);

  return newpad;
}

/* handle events */
static gboolean
gst_concat_mux_handle_src_event(GstPad * pad, GstEvent * event)
{
  GstConcatMux *concat_mux;
  GstEventType type;

  concat_mux = GST_CONCAT_MUX(gst_pad_get_parent(pad));

  type = event ? GST_EVENT_TYPE(event) : GST_EVENT_UNKNOWN;

  switch (type)
	{
	case GST_EVENT_SEEK:
	 /* disable seeking for now */
	  return FALSE;
	default:
	  break;
	}

  gst_object_unref(concat_mux);

  return gst_pad_event_default(pad, event);
}

/* handle events */
static gboolean
gst_concat_mux_handle_sink_event(GstPad * pad, GstEvent * event)
{
  GstConcatMux *mux;
  GstEventType type;

  mux = GST_CONCAT_MUX(gst_pad_get_parent(pad));

  type = event ? GST_EVENT_TYPE(event) : GST_EVENT_UNKNOWN;

  switch (type)
	{
	case GST_EVENT_EOS:
	  {
		mux->resync = TRUE;
		g_debug("sink EOS %p / %d", pad, g_slist_length(mux->sinks));
	   /* mark pad eos */
		mux->sinks = g_slist_remove(mux->sinks, pad);
		g_debug("sink len %d", g_slist_length(mux->sinks));
		if (g_slist_length(mux->sinks) != 0)
		  {
			GMutex *mutex;
			mux->sinkpad = mux->sinks->data;
			mutex = (GMutex *) gst_pad_get_element_private(mux->sinkpad);
			g_mutex_unlock(mutex);
			g_debug("sink pad %p", mux->sinkpad);
			return TRUE;
		  }

		g_debug("sink list is empty");
	  }
	default:
	  break;
	}

  gst_object_unref(mux);

  return gst_pad_event_default(pad, event);
}

static GstFlowReturn
gst_concat_mux_chain(GstPad * pad, GstBuffer * buf)
{
  GstConcatMux *mux = (GstConcatMux *) GST_PAD_PARENT(pad);
  GstBuffer *databuf = NULL;
  GstFlowReturn ret = GST_FLOW_OK;
  GMutex *mutex;


  mutex = (GMutex *) gst_pad_get_element_private(pad);

  g_mutex_lock(mutex);
  if (mux->done)
	{
	  g_debug("DONE pad %p", pad);
	  g_mutex_unlock(mutex);
	  return GST_FLOW_OK;
	}

  databuf = gst_buffer_make_metadata_writable(buf);

  if (!mux->negotiated)
	{
	 /*
	    GstCaps *newcaps;
	    newcaps = gst_pad_get_caps (mux->sinkpad);

	    g_debug ("CAPS: %s",gst_caps_to_string (newcaps));

	    if (!gst_pad_set_caps (mux->srcpad, newcaps))
	    goto nego_error;
	  */
	  mux->negotiated = TRUE;
	}

 /*
    g_debug ("Running [%s]\n"
    "\tTOFFSET    [%"G_GUINT64_FORMAT"]\n"
    "\tB_TSTAMP   [%"G_GUINT64_FORMAT"]\n"
    "\tB_DURATION [%"G_GUINT64_FORMAT"]\n"
    "\tOFFSET     [%"G_GUINT64_FORMAT"]\n"
    "\tB_OFFSET   [%"G_GUINT64_FORMAT"]",
    gst_element_get_name (mux),
    mux->timeoffset, 
    GST_BUFFER_TIMESTAMP (databuf),
    GST_BUFFER_DURATION (databuf),
    mux->offset,
    GST_BUFFER_OFFSET (databuf));
  */


  if (mux->resync)
	{
	  g_debug("RESYNC [%s]", gst_element_get_name(mux));
	  mux->timeoffset += GST_BUFFER_TIMESTAMP(databuf);
	  GST_BUFFER_TIMESTAMP(databuf) = mux->timeoffset;
	  mux->timeoffset += GST_BUFFER_DURATION(databuf);

	  mux->offset += GST_BUFFER_OFFSET(databuf);
	  GST_BUFFER_OFFSET(databuf) = mux->offset;
	  mux->offset += GST_BUFFER_SIZE(databuf);
	  mux->resync = FALSE;
	}
  else
	{

	  GST_BUFFER_TIMESTAMP(databuf) = mux->timeoffset;
	  mux->timeoffset += GST_BUFFER_DURATION(databuf);

	  GST_BUFFER_OFFSET(databuf) = mux->offset;
	  mux->offset += GST_BUFFER_SIZE(databuf);
	}

  gst_buffer_set_caps(databuf, GST_PAD_CAPS(pad));
  ret = gst_pad_push(mux->srcpad, databuf);

 //gst_buffer_unref (buf);

  g_mutex_unlock(mutex);
  return ret;
/*
nego_error:
  {
    GST_WARNING_OBJECT (mux, "failed to set caps");
    GST_ELEMENT_ERROR (mux, CORE, NEGOTIATION, (NULL), (NULL));
    return GST_FLOW_NOT_NEGOTIATED;
  }
  */
 /*
    no_caps:
    {
    GST_WARNING_OBJECT (mux, "no caps on the incoming buffer %p", best->buffer);
    GST_ELEMENT_ERROR (mux, CORE, NEGOTIATION, (NULL), (NULL));
    ret = GST_FLOW_NOT_NEGOTIATED;
    goto beach;
    }
  */
}

static GstStateChangeReturn
gst_concat_mux_change_state(GstElement * element, GstStateChange transition)
{
  GstConcatMux *concat_mux;
  GstStateChangeReturn ret;

  concat_mux = GST_CONCAT_MUX(element);

  switch (transition)
	{
	case GST_STATE_CHANGE_READY_TO_PAUSED:
	  concat_mux->done = FALSE;
	  concat_mux->resync = TRUE;
	  GST_DEBUG_OBJECT(concat_mux, "starting collect pads");
	  break;
	case GST_STATE_CHANGE_PAUSED_TO_READY:
	  GST_DEBUG_OBJECT(concat_mux, "stopping collect pads");
	  gst_concat_mux_clear(concat_mux);
	  break;
	default:
	  break;
	}

  ret = GST_ELEMENT_CLASS(parent_class)->change_state(element, transition);
  if (ret == GST_STATE_CHANGE_FAILURE)
	return ret;

  switch (transition)
	{
	default:
	  break;
	}

  return ret;
}

gboolean
gst_concat_mux_plugin_init(GstPlugin * plugin)
{
#ifdef ENABLE_NLS
  setlocale(LC_ALL, "");
  bindtextdomain(GETTEXT_PACKAGE, LOCALEDIR);
#endif /* ENABLE_NLS */

  GST_DEBUG_CATEGORY_INIT(gst_concat_mux_debug, "concatmux", 0,
						  "concat muxer");

  return gst_element_register(plugin, "concatmux", GST_RANK_NONE,
							  GST_TYPE_CONCAT_MUX);
}

GST_PLUGIN_DEFINE(GST_VERSION_MAJOR,
				  GST_VERSION_MINOR,
				  "concatmux",
				  "Concat streamers",
				  gst_concat_mux_plugin_init, VERSION, GST_LICENSE,
				  GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)