#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <glib.h>

#include <gst/gst.h>

#include <string.h>

#include "gmencoder.h"

#define G_MENCODER_GET_PRIVATE(obj) \

    (G_TYPE_INSTANCE_GET_PRIVATE ((obj), G_TYPE_MENCODER, GMencoderPrivate))

typedef struct _GMencoderPrivate GMencoderPrivate;

typedef struct _SetupInfo SetupInfo;

struct _SetupInfo

{

    gchar* video_encode;

    gchar* mux_name;

    gchar** video_encode_prop;

    gdouble video_fps;

    gdouble video_rate;

    guint video_width;

    guint video_height;                        

    gchar* audio_encode;

    gchar** audio_encode_prop;

    guint audio_rate;

};

struct _GMencoderPrivate

{    

	GstElement *pipe;

	GstElement *abin;

	GstElement *vbin;

	GstElement *sink;

	gboolean ready;

    SetupInfo *info;

    GstClockTime videot;

    GstClockTime audiot;

    gint fd;

};

enum {

  PAUSED,

  PLAYING,

  STOPED,

  EOS,

  ERROR,

  LAST_SIGNAL

};

static void g_mencoder_class_init       (GMencoderClass *klass);

static void g_mencoder_init             (GMencoder *object);

static void g_mencoder_dispose  	    (GObject *object);

static void g_mencoder_finalize 	    (GObject *object);

static GstElement*

            _create_audio_bin           (const gchar* encode,

                                         gchar** encode_prop,

                                         gint rate);

static GstElement*

            _create_video_bin           (const gchar* encode,

                                        gchar** encode_prop,

                                        gdouble fps,

                                        gint rate,

                                        guint width, 

                                        guint height);

static gboolean 

            _pipeline_bus_cb            (GstBus     *bus,

		                                 GstMessage *msg,

		                                 gpointer    user_data);

static void _decodebin_new_pad_cb 		(GstElement* object,

				                         GstPad* pad,

				                         gboolean flag,

				                         gpointer user_data);

static void  _decodebin_unknown_type_cb (GstElement* object,

		                         	     GstPad* pad,

                                         GstCaps* caps,

                                         gpointer user_data);

static void _close_output              (GMencoder *self);

static void _open_output               (GMencoder *self,

                                         const gchar* uri);

static GstElement* _create_source       (const gchar* uri);

static GstElement*_create_pipeline      (GMencoder *self,

                                          const gchar* video_encode,

                                          const gchar* mux_name,

                                          gchar** video_encode_prop,

                                          gdouble video_fps,

                                          gdouble video_rate,

                                          guint video_width, 

                                          guint video_height,                         

                                          const gchar* audio_encode,

                                          gchar** audio_encode_prop,

                                          guint audio_rate);

static guint g_mencoder_signals[LAST_SIGNAL] = { 0 };

G_DEFINE_TYPE(GMencoder, g_mencoder, G_TYPE_OBJECT)

static void

g_mencoder_class_init (GMencoderClass *klass)

{   

	GObjectClass *object_class;

	object_class = (GObjectClass *) klass;

	g_type_class_add_private (klass, sizeof (GMencoderPrivate));

	object_class->dispose  = g_mencoder_dispose;

	object_class->finalize = g_mencoder_finalize;	

    g_mencoder_signals[PAUSED] =

        g_signal_new ("paused",

    		  G_OBJECT_CLASS_TYPE (object_class),

    		  G_SIGNAL_RUN_FIRST,

    		  0, NULL, NULL,

    		  g_cclosure_marshal_VOID__VOID,

    		  G_TYPE_NONE, 0);

    g_mencoder_signals[PLAYING] =

        g_signal_new ("playing",

    		  G_OBJECT_CLASS_TYPE (object_class),

    		  G_SIGNAL_RUN_FIRST,

    		  0, NULL, NULL,

              g_cclosure_marshal_VOID__VOID,

    		  G_TYPE_NONE, 0);

    g_mencoder_signals[STOPED] =

        g_signal_new ("stoped",

    		  G_OBJECT_CLASS_TYPE (object_class),

    		  G_SIGNAL_RUN_FIRST,

    		  0, NULL, NULL,

    		  g_cclosure_marshal_VOID__VOID,

    		  G_TYPE_NONE, 0);

    g_mencoder_signals[EOS] =

        g_signal_new ("eos",

    		  G_OBJECT_CLASS_TYPE (object_class),

    		  G_SIGNAL_RUN_FIRST,

    		  0, NULL, NULL,

    		  g_cclosure_marshal_VOID__VOID,

    		  G_TYPE_NONE, 0);

    g_mencoder_signals[ERROR] =

        g_signal_new ("error",

    		  G_OBJECT_CLASS_TYPE (object_class),

    		  G_SIGNAL_RUN_FIRST,

    		  0, NULL, NULL,

    		  g_cclosure_marshal_VOID__STRING,

    		  G_TYPE_NONE, 1, G_TYPE_STRING);	

}

static void

g_mencoder_init (GMencoder *self)

{

	GMencoderPrivate *priv = G_MENCODER_GET_PRIVATE (self);

    priv->info = g_new0 (SetupInfo, 1);

}

static void 

g_mencoder_dispose (GObject *object)

{

}

static void 

g_mencoder_finalize (GObject *object)

{

    //TODO: clear vars

	g_mencoder_close_stream (G_MENCODER (object));

}

GMencoder*  

g_mencoder_new (void)

{

    return g_object_new (G_TYPE_MENCODER, NULL);

}

static void

_obj_set_prop (GObject *obj, 

                const gchar *prop_name,

                const gchar *prop_val)

{

    GValue p = {0};

    GValue v = {0};

    GParamSpec *s = NULL;

    GObjectClass *k = G_OBJECT_GET_CLASS (obj);

    g_value_init (&v, G_TYPE_STRING);

    g_value_set_string (&v, prop_val);

    s = g_object_class_find_property (k, prop_name);

    if (s == NULL) {

        g_print ("Invalid property name: %s\n", prop_name);

        return;

    }

    g_value_init (&p, s->value_type);

    switch (s->value_type) 

    {

        case G_TYPE_INT:

            g_value_set_int (&p, atoi (prop_val));

            break;

        case G_TYPE_STRING:

            g_value_set_string (&p, prop_val);

            break;

        default:

            return;

    }

    g_object_set_property (obj, prop_name, &p);

    g_value_unset (&v);

    g_value_unset (&p);

}

static GstElement*

_create_element_with_prop (const gchar* factory_name,

                            const gchar* element_name,

                            gchar** prop)

{

    GstElement *ret;

    int i;

    ret = gst_element_factory_make (factory_name, element_name);

    if (ret == NULL)

        return NULL;

    if (prop != NULL) {

        for (i=0; i < g_strv_length (prop); i++) {

            char** v = g_strsplit(prop[i], "=", 2);

            if (g_strv_length (v) == 2) {

                _obj_set_prop (G_OBJECT (ret), v[0], v[1]);

            }

            g_strfreev (v);

        }

    }

    return ret;

}

static GstElement*

_create_audio_bin (const gchar* encode,

                   gchar** encode_prop,

                   gint rate)

{

    GstElement *abin = NULL;

    GstElement *aqueue = NULL;

    GstElement *aconvert = NULL;

    GstElement *aencode = NULL;

    GstElement *aqueue_src = NULL;

    GstPad *apad = NULL;

    //audio/x-raw-int ! queue ! audioconvert ! faac ! rtpmp4gpay !  udpsink name=upd_audio host=224.0.0.1 port=5002	

	abin 	= gst_bin_new ("abin");

	aqueue	= gst_element_factory_make ("queue", "aqueue");

	aconvert= gst_element_factory_make ("audioconvert", "aconvert");

	aencode = _create_element_with_prop ((encode ? encode : "lame"), "aencode", encode_prop);

	aqueue_src= gst_element_factory_make ("queue", "aqueue_src");	

	if ((abin == NULL) || (aqueue == NULL) || (aconvert == NULL) 

		|| (aencode == NULL) || (aqueue_src == NULL)) {

		g_warning ("Audio elements not found");

		goto error;

	}

    g_object_set (G_OBJECT (aencode), "bitrate", 32, NULL);

    /*

    if (rate > 0) {

        g_object_set (G_OBJECT (aencode), "bitrate", 32, NULL);

    }

    */

	gst_bin_add_many (GST_BIN (abin), aqueue, aconvert, aencode, aqueue_src, NULL);

	if (gst_element_link_many (aqueue, aconvert, aencode, aqueue_src, NULL) == FALSE) {

        g_warning ("Not Link audio elements");

    }

    //TODO: apply audio rate 

	// ghost pad the audio bin

   	apad = gst_element_get_pad (aqueue, "sink");

   	gst_element_add_pad (abin, gst_ghost_pad_new("sink", apad));

	gst_object_unref (apad);

   	apad = gst_element_get_pad (aqueue_src, "src");

   	gst_element_add_pad (abin, gst_ghost_pad_new("src", apad));

    gst_object_unref (apad);

    return abin;

error:

   	if (abin != NULL)

		gst_object_unref (abin);

	if (aqueue != NULL)

		gst_object_unref (aqueue);

	if (aconvert != NULL)

		gst_object_unref (aconvert);

	if (aencode != NULL)

		gst_object_unref (aencode);

	if (aqueue_src != NULL)

		gst_object_unref (aqueue_src);

    if (apad != NULL)

        gst_object_unref (apad);

    return NULL;

}

//queue ! videoscale ! video/x-raw-yuv,width=240,height=144 ! colorspace ! rate ! encode ! queue

static GstElement*

_create_video_bin (const gchar* encode,

                    gchar** encode_prop,

                    gdouble fps,

                    gint rate,

                    guint width, 

                    guint height)

{

    GstElement *vbin = NULL;

    GstElement *vqueue = NULL;

    GstElement* vqueue_src = NULL;

    GstElement *vcolorspace = NULL;

    GstElement *vencode = NULL;

    GstElement *vrate = NULL;

    GstPad *vpad = NULL;

	vbin    = gst_bin_new ("vbin");

	vqueue	= gst_element_factory_make ("queue", "vqueue");

	vcolorspace = gst_element_factory_make ("ffmpegcolorspace", "colorspace");

	vencode = _create_element_with_prop ((encode ? encode : "ffenc_mpeg1video"), "vencode", encode_prop);

    vrate   = gst_element_factory_make ("videorate", "vrate");

	vqueue_src = gst_element_factory_make ("queue", "queue_src");

	if ((vbin == NULL) || (vqueue == NULL) || (vcolorspace == NULL) 

		|| (vencode == NULL) || (vqueue_src == NULL)) {

		g_warning ("Video elements not found");

		goto error;

	}

	gst_bin_add_many (GST_BIN (vbin), vqueue, vcolorspace, vencode, vqueue_src, NULL);

    if ((width > 0) && (height > 0)) {        

        //Scalling video

        GstCaps *vcaps;

	    GstElement *vscale  = gst_element_factory_make ("videoscale", "vscale");

        gst_bin_add (GST_BIN (vbin), vscale);

        vcaps = gst_caps_new_simple ("video/x-raw-yuv",

                           "width", G_TYPE_INT, width,

                           "height", G_TYPE_INT, height,                           

                           NULL);

        gst_element_link (vqueue, vscale);

        if (gst_element_link_filtered (vscale, vcolorspace, vcaps) == FALSE) {

            g_warning ("Fail to resize video");

            gst_object_unref (vcaps);

            gst_object_unref (vscale);

            goto error;

        }

        gst_caps_unref (vcaps);

    } else {

        gst_element_link (vqueue, vcolorspace);

    }

    if (fps > 0) {

        //Changing the video fps

        GstCaps *vcaps;

        gst_bin_add (GST_BIN (vbin), vrate);

    	if (gst_element_link (vcolorspace, vrate) == FALSE) {

	        g_warning ("Fail to link video elements");

	        goto error;

    	}

    	vcaps = gst_caps_new_simple ("video/x-raw-yuv",

					   "framerate", GST_TYPE_FRACTION, (int) (fps * 1000), 1000, NULL);

        if (gst_element_link_filtered (vrate, vencode, vcaps) == FALSE) { 

           g_warning ("Fail to link vrate with vencode.");

           goto error;

        }

        gst_caps_unref (vcaps);

    } else {

        if (gst_element_link (vcolorspace, vencode) == FALSE) {

            g_warning ("Fail to link colorspace and video encode element.");

            goto error;

        }

    }

    gst_element_link (vencode, vqueue_src);

	// ghost pad the video  bin

   	vpad = gst_element_get_pad (vqueue, "sink");

   	gst_element_add_pad (vbin, gst_ghost_pad_new ("sink", vpad));	

	gst_object_unref (vpad);

   	vpad = gst_element_get_pad (vqueue_src, "src");

   	gst_element_add_pad (vbin, gst_ghost_pad_new ("src", vpad));	

	gst_object_unref (vpad);

    return vbin;

error:

    if (vpad != NULL)

        gst_object_unref (vpad);

	if (vbin != NULL)

		gst_object_unref (vbin);

	if (vqueue != NULL)

		gst_object_unref (vqueue);

	if (vencode != NULL)

		gst_object_unref (vencode);

	if (vqueue_src != NULL)

		gst_object_unref (vqueue_src);

    if (vcolorspace != NULL)

        gst_object_unref (vcolorspace);

    return NULL;

}

void

g_mencoder_setup_stream (GMencoder *self, 

                         const gchar* video_encode,

                         const gchar* mux_name,

                         gchar** video_encode_prop,

                         gdouble video_fps,

                         gdouble video_rate,

                         guint video_width, 

                         guint video_height,                         

                         const gchar* audio_encode,

                         gchar** audio_encode_prop,

                         guint audio_rate,

                         const gchar* out_uri)

{

    GMencoderPrivate *priv = G_MENCODER_GET_PRIVATE (self);

    if (priv->ready == TRUE) {

        g_warning ("Stream already configured. You need close stream first.");

        return;

    }

    priv->pipe = _create_pipeline (self,

            video_encode,

            mux_name,

            video_encode_prop,

            video_fps,

            video_rate,

            video_width,

            video_height,

            audio_encode,

            audio_encode_prop,

            audio_rate);

    _close_output (self);

    _open_output (self, out_uri);

}

gboolean

g_mencoder_append_uri (GMencoder *self,

                     const gchar* uri)

{

    GstElement *ap;

    GstElement *vp;

    GstPad *pad_src;

    GstPad *pad_sink;

    GstElement *src;

    GMencoderPrivate *priv = G_MENCODER_GET_PRIVATE (self);

    gboolean ret = FALSE;

    g_return_val_if_fail (priv->pipe != NULL, FALSE);

    g_return_val_if_fail (priv->ready == FALSE, FALSE);

    src = _create_source (uri);

    if (src == NULL) 

        return FALSE;

    gst_bin_add (GST_BIN (priv->pipe), src);

    ap = gst_bin_get_by_name (GST_BIN (priv->pipe), "ap");

    vp = gst_bin_get_by_name (GST_BIN (priv->pipe), "vp");

    if ((vp == NULL)  || (ap == NULL))

        goto error;

    pad_src = gst_element_get_pad (src, "src_audio");

    pad_sink = gst_element_get_compatible_pad (ap, 

            pad_src, 

            gst_pad_get_caps (pad_src));

    if ((pad_sink == NULL) || (pad_src == NULL))

        goto error;

    GstPadLinkReturn lret = gst_pad_link (pad_src, pad_sink);

    if (lret != GST_PAD_LINK_OK)

        goto error;

    gst_object_unref (pad_src);

    gst_object_unref (pad_sink);

    pad_src = gst_element_get_pad (src, "src_video");

    pad_sink = gst_element_get_compatible_pad (vp, 

            pad_src, 

            gst_pad_get_caps (pad_src));

    if ((pad_src == NULL) || (pad_sink == NULL))

        goto error;

    if (gst_pad_link (pad_src, pad_sink) != GST_PAD_LINK_OK) {

        g_warning ("invalid source. video");

        goto error;

    }

    ret = TRUE;

error:

    if ((src != NULL) && (ret == FALSE)) {

        gst_bin_remove (GST_BIN (priv->pipe), src);

        gst_object_unref (src);

    }

    if (ap != NULL) 

        gst_object_unref (ap);

    if (vp != NULL)

        gst_object_unref (vp);

    if (pad_src != NULL)

        gst_object_unref (pad_src);

    if (pad_sink != NULL)

        gst_object_unref (pad_sink);

    return ret;

}

void        

g_mencoder_remove_uri (GMencoder *self,

                        const gchar* uri)

{

    // GMencoderPrivate *priv = G_MENCODER_GET_PRIVATE (self);

    //TODO: remove src

}

void

g_mencoder_play_stream (GMencoder *self)

{

    GMencoderPrivate *priv = G_MENCODER_GET_PRIVATE (self);

    g_return_if_fail (priv->ready == FALSE);

    priv->ready = TRUE;

    gst_element_set_state (priv->pipe, GST_STATE_PLAYING);

}

void

g_mencoder_pause_stream (GMencoder *self)

{

    GMencoderPrivate *priv = G_MENCODER_GET_PRIVATE (self);

    g_return_if_fail (priv->ready == TRUE);

    gst_element_set_state (priv->pipe, GST_STATE_PAUSED);

}

void

g_mencoder_close_stream (GMencoder *self)

{

    GMencoderPrivate *priv = G_MENCODER_GET_PRIVATE (self);

    if (priv->pipe != NULL) { 

        gst_element_set_state (priv->pipe, GST_STATE_NULL);

        gst_object_unref (priv->pipe);

        priv->pipe = NULL;

        priv->abin = NULL;

        priv->vbin = NULL;

        priv->sink = NULL;

    }

    priv->ready = FALSE;

}

static void

_sink_handoff_cb (GstElement* object,

                  GstBuffer* buf,

                  GstPad* pad,

                  gpointer user_data)

{

    GMencoderPrivate *priv = G_MENCODER_GET_PRIVATE (user_data);

    gint size = 0;

    size = write (priv->fd, GST_BUFFER_DATA (buf),  GST_BUFFER_SIZE (buf));

    if (size == -1) {

        g_signal_emit (user_data, g_mencoder_signals[ERROR], 0, "Fail to write output");

    }

}

static GstElement*

_create_pipeline (GMencoder *self,

                  const gchar* video_encode,

                  const gchar* mux_name,

                  gchar** video_encode_prop,

                  gdouble video_fps,

                  gdouble video_rate,

                  guint video_width, 

                  guint video_height,                         

                  const gchar* audio_encode,

                  gchar** audio_encode_prop,

                  guint audio_rate)

{

	GstBus *bus = NULL;

	GstElement *pipe = NULL;

	GstElement *sink = NULL;

    GstElement *mux = NULL;

    GstElement *abin = NULL;

    GstElement *vbin = NULL;    

    GstElement *ap = NULL;

    GstElement *vp = NULL;    

    GstPad *aux_pad = NULL;

    GstPad *mux_pad = NULL;

	pipe = gst_pipeline_new ("pipe");

    ap = gst_element_factory_make ("multipartmux", "ap");

    vp = gst_element_factory_make ("multipartmux", "vp");

    mux = gst_element_factory_make ((mux_name ? mux_name : "ffmux_mpeg"), "mux");

    if (mux == NULL)

        goto error;

    sink = gst_element_factory_make ("fakesink", "sink");

    if (sink == NULL)

        goto error;

    g_object_set (G_OBJECT(sink), 

            "sync", FALSE,

            "signal-handoffs", TRUE, NULL);

    abin = _create_audio_bin (audio_encode, audio_encode_prop, audio_rate);

    if (abin == NULL)

        goto error;

    vbin = _create_video_bin (video_encode, video_encode_prop, video_fps, video_rate, video_width, video_height);

    if (vbin == NULL)

        goto error;

	// Finish Pipe

    gst_bin_add_many (GST_BIN (pipe), ap, abin, vp, vbin, mux, sink, NULL);

    if (gst_element_link (ap, abin) == FALSE) {

        g_warning ("Fail to link multipart and abin");

        goto error;

    }

    if (gst_element_link (vp, vbin) == FALSE) {

        g_warning ("Fail to link multipart and vbin");

    }

    //Link bins with mux

    aux_pad = gst_element_get_pad (abin, "src");

    mux_pad = gst_element_get_pad (mux, "audio_0");

    if (mux_pad == NULL) {

        g_warning ("Mux element no have audio_0 PAD");

        goto error;

    }

    GstPadLinkReturn ret = gst_pad_link (aux_pad, mux_pad);

    if (ret != GST_PAD_LINK_OK) {

        g_warning ("Fail link audio and mux: %d", ret);

        goto error;

    }

	gst_object_unref (aux_pad);

    gst_object_unref (mux_pad);

    aux_pad = gst_element_get_pad (vbin, "src");

    mux_pad = gst_element_get_pad (mux, "video_0");

    if (mux_pad == NULL) {

        g_warning ("Mux element no have video_0 PAD");

        goto error;

    }

    ret = gst_pad_link (aux_pad, mux_pad);

    if (ret != GST_PAD_LINK_OK) {

        g_warning ("Fail link video and mux: %d", ret);

        goto error;

    }

    gst_object_unref (aux_pad);

    gst_object_unref (mux_pad);

    aux_pad = NULL;

    mux_pad = NULL;

    //Link mux with sink

    gst_element_link (mux, sink);

    g_signal_connect (G_OBJECT (sink),

				"handoff",

				G_CALLBACK (_sink_handoff_cb),

				self);

	bus = gst_pipeline_get_bus (GST_PIPELINE (pipe));

	gst_bus_add_watch (bus, _pipeline_bus_cb, self);

	gst_object_unref (bus);

    return pipe;

error:

	g_warning ("Invalid uri");

	if (pipe != NULL) {

		gst_object_unref (pipe);

    }

    if (mux != NULL) {

        gst_object_unref (mux);

    }

    if (mux_pad != NULL) {

        gst_object_unref (mux_pad);

    }

    if (aux_pad != NULL) {

        gst_object_unref (mux_pad);

    }

	if (sink != NULL) {

		gst_object_unref (sink);

    }

    if (abin != NULL) {

        gst_object_unref (abin);

    }

    if (vbin != NULL) {

        gst_object_unref (vbin);

    }

	return FALSE;

}

static void

_close_output (GMencoder *self)

{

}

static GstElement*

_create_source (const gchar* uri)

{

    GstElement *bsrc;

    GstElement *src;

    GstElement *aqueue;

    GstElement *vqueue;

    GstElement *decode;

    GstPad *src_pad;

    bsrc = gst_bin_new (NULL);

	src = gst_element_factory_make ("gnomevfssrc", "src");

    g_object_set (G_OBJECT (src), "location", uri, NULL);

	if (src == NULL) 

		goto error;

	decode = gst_element_factory_make ("decodebin2", "decode");

	if (decode == NULL) 

		goto error;

    aqueue = gst_element_factory_make ("queue", "aqueue");

    if (aqueue == NULL)

        goto error;

    vqueue = gst_element_factory_make ("queue", "vqueue");

    if (vqueue == NULL)

        goto error;

    gst_bin_add_many (GST_BIN (bsrc), src, decode, aqueue, vqueue, NULL);

    gst_element_link (src, decode);

	g_signal_connect (G_OBJECT (decode), 

				"new-decoded-pad",

				G_CALLBACK (_decodebin_new_pad_cb),

				bsrc);

	g_signal_connect (G_OBJECT (decode),

				"unknown-type",

				G_CALLBACK (_decodebin_unknown_type_cb),

				pipe);

    src_pad = gst_element_get_pad (aqueue, "src");

   	gst_element_add_pad (bsrc, gst_ghost_pad_new("src_audio", src_pad));

    gst_object_unref (src_pad);

    src_pad = gst_element_get_pad (vqueue, "src");

   	gst_element_add_pad (bsrc, gst_ghost_pad_new("src_video", src_pad));

    gst_object_unref (src_pad);

    return bsrc;

error:

	if (src != NULL) {

		gst_object_unref (src);

    }

	if (decode != NULL) {

		gst_object_unref (decode);

    }

	if (aqueue != NULL) {

		gst_object_unref (aqueue);

    }

	if (vqueue != NULL) {

		gst_object_unref (vqueue);

    }

    return NULL;

}

static void

_open_output (GMencoder *self, 

              const gchar* uri)

{

    gchar** i;

    GMencoderPrivate *priv = G_MENCODER_GET_PRIVATE (self);

    i = g_strsplit (uri, "://", 0);

    if (strcmp (i[0], "fd") == 0) {

        priv->fd = atoi (i[1]);

    } else if (strcmp (i[0], "file") == 0) {

        priv->fd = open (i[1], O_WRONLY | O_CREAT | O_TRUNC);

    } else {

        g_warning ("Output uri not supported");

    }

    g_strfreev (i);

}

static gboolean

_pipeline_bus_cb (GstBus     *bus,

		  GstMessage *msg,

		  gpointer    user_data)

{

	GMencoderPrivate *priv = G_MENCODER_GET_PRIVATE (user_data);

	switch (GST_MESSAGE_TYPE (msg)) 

	{

		case GST_MESSAGE_STATE_CHANGED:

		{

			GstState oldstate;

			GstState newstate;

			GstState pendingstate;

			gst_message_parse_state_changed (msg, &oldstate,

				&newstate, &pendingstate);

            if (pendingstate != GST_STATE_VOID_PENDING)

                break;

            if ((oldstate == GST_STATE_READY) && 

                (newstate == GST_STATE_PAUSED)) {

                    if (priv->ready) 

                        g_signal_emit (user_data, g_mencoder_signals[PAUSED], 0);

            } else if ((oldstate == GST_STATE_PAUSED) &&

                       (newstate == GST_STATE_PLAYING)) {

                        g_signal_emit (user_data, g_mencoder_signals[PLAYING], 0);

            } else if ((oldstate == GST_STATE_READY) &&

                       (newstate == GST_STATE_NULL)) {

                        g_signal_emit (user_data, g_mencoder_signals[STOPED], 0);

            }			

            break;

		}

		case GST_MESSAGE_ERROR: 

		{

		    GError *error;

		    gchar *debug;

		    gchar *err_str;

		    gst_message_parse_error (msg, &error, &debug);

		    err_str = g_strdup_printf ("Error [%d] %s (%s)", error->code,

		        error->message,

		        debug);

		    g_signal_emit (user_data, g_mencoder_signals[ERROR], 0, err_str);

            priv->ready = FALSE;

		    g_free (err_str);

		    g_clear_error (&error);

		    g_free (debug);

		    break;

		}

		case GST_MESSAGE_EOS:

            priv->ready = FALSE;

		    g_signal_emit (user_data, g_mencoder_signals[EOS], 0);

		    break;		

		default:

			break;

	}

	return TRUE;

}

static void 

_decodebin_new_pad_cb (GstElement* object,

                       GstPad* pad,

                       gboolean flag,

                       gpointer user_data)

{

	GstCaps *caps;

	gchar *str_caps = NULL;

    GstElement *sink_element;

    GstPad *sink_pad;

	caps = gst_pad_get_caps (pad);

	str_caps = gst_caps_to_string (caps);

	if (strstr (str_caps, "audio") != NULL) {

        sink_element = gst_bin_get_by_name (GST_BIN (user_data), "aqueue");

	} else if (strstr (str_caps, "video") != NULL) {

        sink_element = gst_bin_get_by_name (GST_BIN (user_data), "vqueue");

	} else {

		g_warning ("invalid caps %s", str_caps);

	}

    sink_pad = gst_element_get_pad (sink_element, "sink");

	gst_pad_link (pad, sink_pad);

    gst_object_unref (sink_element);

	gst_object_unref (sink_pad);

	g_free (str_caps);

	gst_caps_unref (caps);

}

static void 

_decodebin_unknown_type_cb (GstElement* object,

                            GstPad* pad,

                            GstCaps* caps,

                            gpointer user_data)

{

    g_warning  ("Unknown Type");

    //priv->ready = FALSE;

}