/* 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)