/* 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);

      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,

    "concat muxer",

    "Concat streamers",

     plugin_init, VERSION, "LGPL", "ConcatMux", "")