/* vim: set sw=2: -*- Mode: C; tab-width: 2; indent-tabs-mode: t; c-basic-offset: 2; c-indent-level: 2 -*- */

 /* GStreamer MythTV Plug-in

  * Copyright (C) <2006> Rosfran Borges <rosfran.borges@indt.org.br>

  *

  * This library is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Library Lesser 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 

  */

  /**

   * When using the LiveTV content, put the location URI in the following

   * format:

   * 

   * 	myth://mythtv:mythtv@xxx.xxx.xxx.xxx:6543/#mythconverg

   * 

   * Where the first field is the protocol (myth), the second and third are user 

   * name (mythtv) and password (mythtv), then backend host name and port number, 

   * and the last field is the database name (mythconverg).

   */

 #ifdef HAVE_CONFIG_H

 #include "config.h"

 #endif

 #include "gstmythtvsrc.h"

 #include <gmyth/gmyth_file_transfer.h>

 #include <gmyth/gmyth_livetv.h>

 #include <gmyth/gmyth_socket.h>

 #include <gmyth/gmyth_tvchain.h>

 #include <string.h>

 #include <unistd.h>

 GST_DEBUG_CATEGORY_STATIC (mythtvsrc_debug);

 #define GST_CAT_DEFAULT mythtvsrc_debug

 #define GST_GMYTHTV_ID_NUM			1

 #define GST_GMYTHTV_CHANNEL_NUM			1000

 #define GMYTHTV_VERSION_DEFAULT			30

 #define GMYTHTV_TRANSFER_MAX_WAITS		100

 #define GMYTHTV_TRANSFER_MAX_RESENDS	2

 #define GMYTHTV_TRANSFER_MAX_BUFFER		128*1024

 //( 32*1024  )

 /* 4*1024 ??? */

 #define MAX_READ_SIZE              		4*1024

 //( 32*1024 )

 #define GST_FLOW_ERROR_NO_DATA  			-101

 #define REQUEST_MAX_SIZE							64*1024

 #define INTERNAL_BUFFER_SIZE					90*1024

 /* stablish a maximum iteration value to the IS_RECORDING message */

 static guint wait_to_transfer = 0;

 static const GstElementDetails gst_mythtv_src_details =

 GST_ELEMENT_DETAILS ( "MythTV client source",

     "Source/Network",

     "Control and receive data as a client over the network via raw socket connections using the MythTV protocol",

     "Rosfran Borges <rosfran.borges@indt.org.br>" );

 static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ( "src",

     GST_PAD_SRC,

     GST_PAD_ALWAYS,

     GST_STATIC_CAPS ("video/x-nuv") );

 enum

 {

   PROP_0,

   PROP_LOCATION,

   PROP_URI,

 #ifndef GST_DISABLE_GST_DEBUG

   PROP_GMYTHTV_DBG,

 #endif

   PROP_GMYTHTV_VERSION,

   PROP_GMYTHTV_LIVE,

   PROP_GMYTHTV_LIVEID,

   PROP_GMYTHTV_LIVE_CHAINID,

   PROP_GMYTHTV_ENABLE_TIMING_POSITION,

   PROP_GMYTHTV_CHANNEL_NUM

 };

 static void gst_mythtv_src_finalize (GObject * gobject);

 static GstFlowReturn gst_mythtv_src_create ( GstPushSrc* psrc, GstBuffer** outbuf );

 static gboolean gst_mythtv_src_start (GstBaseSrc * bsrc);

 static gboolean gst_mythtv_src_stop (GstBaseSrc * bsrc);

 static gboolean gst_mythtv_src_get_size (GstBaseSrc * bsrc, guint64 * size);

 static gboolean gst_mythtv_src_is_seekable( GstBaseSrc *push_src );

 /*

 static void gst_mythtv_src_get_times (GstBaseSrc * src, GstBuffer * buffer,

    GstClockTime * start, GstClockTime * end);

 */

 static gboolean gst_mythtv_src_do_seek( GstBaseSrc *base, GstSegment *segment );

 static gboolean gst_mythtv_src_next_program_chain ( GstMythtvSrc *src );

 static GstStateChangeReturn

 gst_mythtv_src_change_state (GstElement * element, GstStateChange transition);

 static void gst_mythtv_src_set_property (GObject * object, guint prop_id,

     const GValue * value, GParamSpec * pspec);

 static void gst_mythtv_src_get_property (GObject * object, guint prop_id,

     GValue * value, GParamSpec * pspec);

 static void gst_mythtv_src_uri_handler_init (gpointer g_iface, gpointer iface_data);

 static gboolean gst_mythtv_src_handle_query (GstPad * pad, GstQuery * query);

 static gboolean gst_mythtv_src_handle_event (GstPad * pad, GstEvent * event);

 static gint do_read_request_response (GstMythtvSrc * src, guint size, GByteArray *data_ptr);

 GStaticRecMutex th_mutex = G_STATIC_REC_MUTEX_INIT;

 static void

 _urihandler_init (GType type)

 {

   static const GInterfaceInfo urihandler_info = {

     gst_mythtv_src_uri_handler_init,

     NULL,

     NULL

   };

   g_type_add_interface_static (type, GST_TYPE_URI_HANDLER, &urihandler_info);

   GST_DEBUG_CATEGORY_INIT (mythtvsrc_debug, "mythtvsrc", 0,

       "MythTV src");

 }

 GST_BOILERPLATE_FULL (GstMythtvSrc, gst_mythtv_src, GstPushSrc,

     GST_TYPE_PUSH_SRC, _urihandler_init)

 static void

 gst_mythtv_src_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 (&srctemplate));

   gst_element_class_set_details (element_class, &gst_mythtv_src_details);

   element_class->change_state = gst_mythtv_src_change_state;

 }

 static void

 gst_mythtv_src_class_init (GstMythtvSrcClass * klass)

 {

   GObjectClass *gobject_class; 

   GstPushSrcClass *gstpushsrc_class;

   GstBaseSrcClass *gstbasesrc_class;

   gobject_class = (GObjectClass *) klass;

   gstbasesrc_class = (GstBaseSrcClass *) klass;

   gstpushsrc_class = (GstPushSrcClass *) klass;

   gobject_class->set_property = gst_mythtv_src_set_property;

   gobject_class->get_property = gst_mythtv_src_get_property;

   gobject_class->finalize = gst_mythtv_src_finalize;

   g_object_class_install_property

     (gobject_class, PROP_LOCATION,

      g_param_spec_string ("location", "Location",

        "The location. In the form:"

        "\n\t\t\tmyth://a.com/file.nuv"

        "\n\t\t\tmyth://a.com:23223/file.nuv "

        "\n\t\t\ta.com/file.nuv - default scheme 'myth'",

        "", G_PARAM_READWRITE));

   g_object_class_install_property

     (gobject_class, PROP_URI,

      g_param_spec_string ("uri", "Uri",

        "The location in form of a URI (deprecated; use location)",

        "", G_PARAM_READWRITE));

   g_object_class_install_property

     (gobject_class, PROP_GMYTHTV_VERSION,

      g_param_spec_int ("mythtv-version", "mythtv-version",

        "Change MythTV version",

        26, 30, 26, G_PARAM_READWRITE));

   g_object_class_install_property

     (gobject_class, PROP_GMYTHTV_LIVEID,

      g_param_spec_int ("mythtv-live-id", "mythtv-live-id",

        "Change MythTV version",

        0, 200, GST_GMYTHTV_ID_NUM, G_PARAM_READWRITE));

   g_object_class_install_property

     (gobject_class, PROP_GMYTHTV_LIVE_CHAINID,

      g_param_spec_string ("mythtv-live-chainid", "mythtv-live-chainid",

        "Sets the MythTV chain ID (from TV Chain)",

        "", G_PARAM_READWRITE));

   g_object_class_install_property

     (gobject_class, PROP_GMYTHTV_LIVE,

      g_param_spec_boolean ("mythtv-live", "mythtv-live",

        "Enable MythTV Live TV content streaming",

        FALSE, G_PARAM_READWRITE));

   g_object_class_install_property

     (gobject_class, PROP_GMYTHTV_ENABLE_TIMING_POSITION,

      g_param_spec_boolean ("mythtv-enable-timing-position", "mythtv-enable-timing-position",

        "Enable MythTV Live TV content size continuous updating",

        FALSE, G_PARAM_READWRITE));

   g_object_class_install_property

     (gobject_class, PROP_GMYTHTV_CHANNEL_NUM,

      g_param_spec_int ("mythtv-channel", "mythtv-channel",

        "Change MythTV channel number",

        0, 99999, GST_GMYTHTV_CHANNEL_NUM, G_PARAM_READWRITE));

 #ifndef GST_DISABLE_GST_DEBUG

   g_object_class_install_property

     (gobject_class, PROP_GMYTHTV_DBG,

      g_param_spec_boolean ("mythtv-debug", "mythtv-debug",

        "Enable MythTV debug messages",

        FALSE, G_PARAM_READWRITE));

 #endif

   gstbasesrc_class->start = gst_mythtv_src_start;

   gstbasesrc_class->stop = gst_mythtv_src_stop;

   gstbasesrc_class->get_size = gst_mythtv_src_get_size;

   gstbasesrc_class->is_seekable = gst_mythtv_src_is_seekable;

   //gstbasesrc_class->get_times = gst_mythtv_src_get_times;

   gstbasesrc_class->do_seek = gst_mythtv_src_do_seek;

   gstpushsrc_class->create = gst_mythtv_src_create;

   GST_DEBUG_CATEGORY_INIT (mythtvsrc_debug, "mythtvsrc", 0,

       "MythTV Client Source");

 }

 static void

 gst_mythtv_src_init (GstMythtvSrc * this, GstMythtvSrcClass * g_class)

 {

   this->file_transfer = NULL;

   this->unique_setup = FALSE;

   this->mythtv_version = GMYTHTV_VERSION_DEFAULT;

   this->state = GST_MYTHTV_SRC_FILE_TRANSFER;

   this->bytes_read = 0;

   this->prev_content_size = 0;

   this->content_size = 0;

   this->read_offset = 0;

   this->content_size_last = 0;

   this->live_tv = FALSE;

   this->enable_timing_position = FALSE;

   this->update_prog_chain = FALSE;    

   this->user_agent = g_strdup ("mythtvsrc");

   this->mythtv_caps = NULL;

   this->update_prog_chain = FALSE;

   this->channel_num = 0;

   this->eos = FALSE;

   this->bytes_queue = NULL;

   this->th_mutex = NULL;

   gst_base_src_set_format( GST_BASE_SRC( this ), GST_FORMAT_BYTES );  

   /* gst_base_src_set_live ( GST_BASE_SRC( this ), TRUE ); */

   gst_pad_set_event_function ( GST_BASE_SRC_PAD(GST_BASE_SRC(this)),

       gst_mythtv_src_handle_event );

   gst_pad_set_query_function ( GST_BASE_SRC_PAD(GST_BASE_SRC(this)),

      gst_mythtv_src_handle_query );

 }

 static void

 gst_mythtv_src_finalize (GObject * gobject)

 {

   GstMythtvSrc *this = GST_MYTHTV_SRC (gobject);

   if (this->mythtv_caps) {

     gst_caps_unref (this->mythtv_caps);

     this->mythtv_caps = NULL;

   }

   if (this->file_transfer) {

     g_object_unref (this->file_transfer);

     this->file_transfer = NULL;

   }

   if (this->spawn_livetv) {

     g_object_unref (this->spawn_livetv);

     this->spawn_livetv = NULL;

   }

   if (this->backend_info) {

     g_object_unref (this->backend_info);

     this->backend_info = NULL;

   }

   if (this->uri_name) {

     g_free (this->uri_name);

   }

   if (this->user_agent) {

     g_free (this->user_agent);

   }

   if ( this->bytes_queue ) {

     g_byte_array_free( this->bytes_queue, TRUE );

     this->bytes_queue = NULL;

   }

   G_OBJECT_CLASS (parent_class)->finalize (gobject);

 }

 static gint

 do_read_request_response (GstMythtvSrc * src, guint size, GByteArray *data_ptr)

 {

   gint read = 0;

   guint sizetoread = size;

   gint max_iters = GMYTHTV_TRANSFER_MAX_RESENDS;

   GST_LOG_OBJECT( src, "Starting: [%s] Reading %d bytes...\n", __FUNCTION__, sizetoread ); 

   /* Loop sending the Myth File Transfer request:

    * Retry whilst authentication fails and we supply it. */

   gint len = 0;

   while ( sizetoread == size && --max_iters > 0) {

     len = gmyth_file_transfer_read( src->file_transfer,

 				data_ptr, sizetoread, TRUE );

     if ( len > 0 ) {

       read += len;

       sizetoread -= len;

     } 

     else if ( len < 0 )

     {

       read = -1;

       if ( src->live_tv == FALSE ) 

       {

 	goto eos;

       } 

       else  

       {

 	if ( len == GMYTHTV_FILE_TRANSFER_READ_ERROR ) { /* -314 */

 	  //src->update_prog_chain = TRUE;

 	  goto done;	  	

 	} else if ( len == GMYTHTV_FILE_TRANSFER_NEXT_PROG_CHAIN ) { /* -315 */

 	  continue;	  	

 	}

 	goto done;

       }

     } else if ( len == 0 )

     	goto done;

     if ( read == sizetoread )

       goto done;

   }

   if ( ( read < 0 && !src->live_tv ) || max_iters == 0 )

     goto eos;

   goto done;

 eos:

   src->eos = TRUE;

 done:

   return read;

 }

 static GstFlowReturn

 gst_mythtv_src_create ( GstPushSrc* psrc, GstBuffer** outbuf )

 {

   GstMythtvSrc *src;

   GstFlowReturn ret = GST_FLOW_OK;

   gint read = -1;

   src = GST_MYTHTV_SRC ( psrc );

   /* The caller should know the number of bytes and not read beyond EOS. */

   if ( G_UNLIKELY (src->eos) )

     goto eos;

   if ( G_UNLIKELY (src->update_prog_chain) )

     goto change_progchain;

   //g_static_rec_mutex_lock( &th_mutex );

   GST_DEBUG_OBJECT( src, "[%s] offset = %llu, size = %d...\n", __FUNCTION__, 

   		src->read_offset, MAX_READ_SIZE );

   GST_DEBUG_OBJECT ( src, "[%s]\t\tCreate: buffer_remain: %d, buffer_size = %d.\n", __FUNCTION__, 

       (gint) src->buffer_remain, src->bytes_queue->len );

   /* just get from the byte array, no network effort... */

   if ( ( src->buffer_remain = src->bytes_queue->len ) < MAX_READ_SIZE ) { 

   			//( ( INTERNAL_BUFFER_SIZE - src->buffer_remain )  >=  REQUEST_MAX_SIZE ) ) {

   	GByteArray *buffer = NULL;

   	guint buffer_size_inter = ( INTERNAL_BUFFER_SIZE - src->buffer_remain );

   	if ( buffer_size_inter > REQUEST_MAX_SIZE )

   		buffer_size_inter = REQUEST_MAX_SIZE;

   	buffer = g_byte_array_new();

     read = do_read_request_response( src, buffer_size_inter, buffer );

     if (G_UNLIKELY (read < 0)) {

       if ( src->live_tv )

 	goto change_progchain;

       else

 	goto read_error;

     } else if (G_UNLIKELY (read == 0))

     {

 	    if (!src->live_tv )

 	    	goto eos;

 	    else

 	    	goto done;

     }

     if ( G_UNLIKELY (src->update_prog_chain) )

       goto change_progchain;

     src->bytes_queue = g_byte_array_append( src->bytes_queue, buffer->data, read );

     if ( read > buffer_size_inter )

     	GST_WARNING_OBJECT( src, "\n\n\n[%s]\t\tINCREASED buffer size! Backend sent more than we ask him... (%d)\n\n\n", 

     			__FUNCTION__, abs( read - buffer_size_inter ) );

     src->buffer_remain += read;

     if ( buffer != NULL ) {

     	g_byte_array_free( buffer, TRUE );

     	buffer = NULL;    	

     }

 	    GST_DEBUG_OBJECT( src, "[%s]\tBYTES READ (actual) = %d, BYTES READ (cumulative) = %llu, "\

 		"OFFSET = %llu, CONTENT SIZE = %llu.\n", __FUNCTION__, read, src->bytes_read, 

 		src->read_offset, src->content_size );

   }

   guint buffer_size = ( src->buffer_remain < MAX_READ_SIZE) ? src->buffer_remain : MAX_READ_SIZE;

   /* Create the buffer. */

   ret = gst_pad_alloc_buffer ( GST_BASE_SRC_PAD (GST_BASE_SRC (psrc)),

       GST_BUFFER_OFFSET_NONE, buffer_size,

       GST_PAD_CAPS (GST_BASE_SRC_PAD (GST_BASE_SRC (psrc))), outbuf );    

   if (G_UNLIKELY (ret != GST_FLOW_OK)) {

     if ( src->live_tv )

       goto change_progchain;

     else

       goto done;

   }

   //*outbuf = gst_buffer_new_and_alloc( buffer_size );

   /* gets the first buffer_size bytes from the byte array buffer variable */ 

   //guint8 *buf = g_memdup( src->bytes_queue->data, buffer_size );

   GST_DEBUG_OBJECT( src, "[%s] read from network? %s!, buffer_remain = %d\n", __FUNCTION__, 

   	read == -1 ? "NO, got from buffer" : "YES, go see the backend's log file", src->buffer_remain );

   GST_BUFFER_SIZE (*outbuf) = buffer_size;

   GST_BUFFER_MALLOCDATA( *outbuf ) = g_malloc0( GST_BUFFER_SIZE (*outbuf) );

   GST_BUFFER_DATA( *outbuf ) = GST_BUFFER_MALLOCDATA( *outbuf );

   g_memmove( GST_BUFFER_DATA( (*outbuf) ), src->bytes_queue->data, GST_BUFFER_SIZE(*outbuf) );

   GST_BUFFER_OFFSET (*outbuf) = src->read_offset;

   GST_BUFFER_OFFSET_END (*outbuf) = src->read_offset + GST_BUFFER_SIZE (*outbuf);

   src->buffer_remain -= GST_BUFFER_SIZE (*outbuf);

   src->read_offset += GST_BUFFER_SIZE (*outbuf);

   src->bytes_read += GST_BUFFER_SIZE (*outbuf);

   GST_DEBUG_OBJECT( src, "[%s]\t\tBuffer output with size: %d\n", __FUNCTION__, GST_BUFFER_SIZE (*outbuf) );

   /* flushs the newly buffer got from byte array */

   src->bytes_queue = g_byte_array_remove_range( src->bytes_queue, 0, buffer_size );

   GST_DEBUG_OBJECT( src, "Got buffer: [%s]\t\tBUFFER --->SIZE = %d, OFFSET = %llu, "\

       "OFFSET_END = %llu.\n\n", __FUNCTION__, GST_BUFFER_SIZE (*outbuf), 

       GST_BUFFER_OFFSET (*outbuf), GST_BUFFER_OFFSET_END (*outbuf) );

   GST_DEBUG_OBJECT( src, "[%s]\tCONTENT_SIZE = %llu, BYTES_READ = %llu.\n", __FUNCTION__, 

   		src->content_size, src->bytes_read );

   if ( G_UNLIKELY (src->eos) || ( !src->live_tv && ( src->bytes_read >= src->content_size ) ) )

    goto eos;

 done:

   {

     const gchar *reason = gst_flow_get_name (ret);

     GST_DEBUG_OBJECT (src, "DONE task, reason %s", reason);

     return ret;

   }

 eos:

   {

     const gchar *reason = gst_flow_get_name (ret);

     GST_DEBUG_OBJECT (src, "pausing task, reason %s", reason);

     return GST_FLOW_UNEXPECTED;

   }

   /* ERRORS */

 read_error:

   {

     GST_ELEMENT_ERROR (src, RESOURCE, READ,

 	(NULL), ("Could not read any bytes (%i, %s)", read,

 		 src->uri_name));

     return GST_FLOW_ERROR;

   }

 change_progchain:

   {

     GST_ELEMENT_ERROR (src, RESOURCE, READ,

 	(NULL), ("Seek failed, go to the next program info... (%i, %s)", read,

 		 src->uri_name));

     gst_pad_push_event ( GST_BASE_SRC_PAD (GST_BASE_SRC (psrc)),

 	gst_event_new_new_segment (TRUE, 1.0, GST_FORMAT_TIME, 0, -1, 0 ) );

     // go to the next program chain

     src->unique_setup = FALSE;

     src->update_prog_chain = TRUE;

     gst_mythtv_src_next_program_chain( src );

     return GST_FLOW_ERROR_NO_DATA;

   }

 }

 gint64

 gst_mythtv_src_get_position ( GstMythtvSrc* src ) 

 {

   gint64 size_tmp = 0;

   guint max_tries = 2;

   if (src->live_tv == TRUE && ( abs( src->content_size - src->bytes_read ) < 

 		GMYTHTV_TRANSFER_MAX_BUFFER ) ) {

 get_file_pos:

     g_usleep( 10 );

     size_tmp = gmyth_recorder_get_file_position( src->spawn_livetv->recorder );

     if ( size_tmp > ( src->content_size + GMYTHTV_TRANSFER_MAX_BUFFER ) )

       src->content_size = size_tmp;

     else if ( size_tmp > 0 && --max_tries > 0 )

       goto get_file_pos;

     GST_LOG_OBJECT( src, "\t[%s]\tGET_POSITION: file_position = %lld\n",

 	__FUNCTION__, size_tmp );

     /* sets the last content size amount before it can be updated */

     src->prev_content_size = src->content_size;

   }

   return src->content_size;	

 }

 static gboolean

 gst_mythtv_src_do_seek( GstBaseSrc *base, GstSegment *segment )

 {

   GstMythtvSrc *src = GST_MYTHTV_SRC( base );

   gint64 new_offset = -1;

   gint64 actual_seek = segment->start;

   gboolean ret = TRUE;

   GST_LOG_OBJECT( src, "[%s]DO Seek called! (start = %lld, stop = %lld)\n", __FUNCTION__, 

   		segment->start, segment->stop );

   if ( segment->format == GST_FORMAT_TIME ) 

   {

     goto done; 

     //actual_seek = ( ( segment->start / 1000 ) * 28 ) * 4000;

   }

   GST_LOG_OBJECT( src, "[%s]Trying to seek at the value (actual_seek = %lld, read_offset = %lld)\n", __FUNCTION__, actual_seek, src->read_offset );

   /* verify if it needs to seek */

   if ( src->read_offset != actual_seek )

   {

     new_offset = gmyth_file_transfer_seek( src->file_transfer, segment->start, SEEK_SET );

     GST_LOG_OBJECT( src, "[%s] Segment offset start = %lld, SRC Offset = %lld, NEW actual backend SEEK Offset = %lld.\n",

 			__FUNCTION__, segment->start, src->read_offset, new_offset );

     if ( G_UNLIKELY (new_offset < 0 ) )

     {

       ret = FALSE;

       if ( src->live_tv )

 	goto change_progchain;

       else

 	goto eos;

     }

     src->read_offset = new_offset;

     if ( ret == FALSE ) {

       GST_INFO_OBJECT( src, "[%s] Failed to set the SEEK on segment!\n", __FUNCTION__ );

     }

   }

 done:

    return ret;

 eos:

   {

     GST_DEBUG_OBJECT (src, "EOS found on seeking!!!");

     return FALSE;

   }

 change_progchain:

   {

     GST_ELEMENT_ERROR (src, RESOURCE, READ,

 	(NULL), ("Seek failed, go to the next program info... (%i, %s)", read,

 		 src->uri_name));

     gst_pad_push_event ( GST_BASE_SRC_PAD (base),

 	gst_event_new_new_segment (TRUE, 1.0, GST_FORMAT_TIME, 0, -1, 0 ) );

     /* go to the next program chain */

     src->unique_setup = FALSE;

     src->update_prog_chain = TRUE;

     gst_mythtv_src_next_program_chain( src );

     return TRUE;

   }

 }

 /* create a socket for connecting to remote server */

 static gboolean

 gst_mythtv_src_start ( GstBaseSrc * bsrc )

 {

   GstMythtvSrc *src = GST_MYTHTV_SRC (bsrc);

   GString *chain_id_local = NULL;

   gboolean ret = TRUE;

   if ( G_UNLIKELY (src->update_prog_chain) )

     goto change_progchain;

   if (src->unique_setup == FALSE) {

     src->unique_setup = TRUE;

   } else {

     goto done;

   }

   src->backend_info = gmyth_backend_info_new_with_uri( src->uri_name );

   if ( src->live_tv ) {  	

     src->spawn_livetv = gmyth_livetv_new( );

     if ( gmyth_livetv_setup( src->spawn_livetv, src->backend_info ) == FALSE ) {

       ret = FALSE;

       goto init_failed;

     }    

     src->file_transfer = gmyth_livetv_create_file_transfer(src->spawn_livetv);

     if (NULL == src->file_transfer ) 

 	  {

 	  	ret = FALSE;

 	    goto init_failed;

 	  }

 		/*

     chain_id_local = gmyth_tvchain_get_id( src->spawn_livetv->tvchain );

     if ( chain_id_local != NULL ) {

       src->live_chain_id = g_strdup( chain_id_local->str );

       GST_INFO_OBJECT( src, "\t[%s]\tLocal chain ID = %s.\n", __FUNCTION__, src->live_chain_id );      

     }

     src->live_tv_id = src->spawn_livetv->recorder->recorder_num;

     GST_LOG_OBJECT( src, "[%s] LiveTV id = %d, URI path = %s.\n", __FUNCTION__, src->live_tv_id, src->uri_name );

     */ 

   } else {

   	src->file_transfer = gmyth_file_transfer_new( src->backend_info );

 		ret = gmyth_file_transfer_open( src->file_transfer, src->uri_name );

   }

   if ( NULL == src->file_transfer ) 

   {

     goto init_failed;

   }

   /*GST_INFO_OBJECT( src, "[%s] uri = %s.\n", __FUNCTION__, src->spawn_livetv->file_transfer );*/

   if ( src->live_tv == TRUE && ret == TRUE ) {

     /* loop finished, set the max tries variable to zero again... */

     wait_to_transfer = 0;

     while ( wait_to_transfer++ < GMYTHTV_TRANSFER_MAX_WAITS &&

 				( gmyth_livetv_is_recording( src->spawn_livetv ) == FALSE ) )

       g_usleep( 500 );

     /* IS_RECORDING again, just like the MythTV backend does... */

 	  gmyth_livetv_is_recording( src->spawn_livetv );

 	  sleep( 3 );  

   }

   if ( ret == FALSE ) {

 #ifndef GST_DISABLE_GST_DEBUG  

     if ( src->mythtv_msgs_dbg )

       GST_INFO_OBJECT( src, "MythTV FileTransfer request failed when setting up socket connection!\n" );  	  

 #endif

     goto begin_req_failed;

   }

   GST_INFO_OBJECT( src, "MythTV FileTransfer filesize = %lld, content_size = %lld!\n", 

   			src->file_transfer->filesize, src->content_size );

   src->content_size = src->file_transfer->filesize;

   src->do_start = FALSE;

   /* this is used for the buffer cache */

   src->bytes_queue = g_byte_array_sized_new( INTERNAL_BUFFER_SIZE );

   src->buffer_remain = 0;

   gst_pad_push_event ( GST_BASE_SRC_PAD (GST_BASE_SRC (src)),

 		gst_event_new_new_segment ( TRUE, 1.0, GST_FORMAT_TIME, 0, src->content_size, 0 ) );

 done:

 	if ( chain_id_local != NULL )

 	{

 		g_string_free( chain_id_local, TRUE );

 		chain_id_local = NULL;

 	}

   return TRUE;

   /* ERRORS */

 init_failed:

   {

     if (src->spawn_livetv != NULL )

       g_object_unref( src->spawn_livetv );

     GST_ELEMENT_ERROR (src, LIBRARY, INIT,

 	(NULL), ("Could not initialize MythTV library (%i, %s)", ret, src->uri_name));

     return FALSE;

   }

 begin_req_failed:

   {

     GST_ELEMENT_ERROR (src, LIBRARY, INIT,

 	(NULL), ("Could not begin request sent to MythTV server (%i, %s)", ret, src->uri_name));

     return FALSE;

   }

 change_progchain:

   {

     GST_ELEMENT_ERROR (src, RESOURCE, READ,

 	(NULL), ("Seek failed, go to the next program info... (%s)",

 		 src->uri_name));

     gst_pad_push_event ( GST_BASE_SRC_PAD (GST_BASE_SRC (src)),

 	gst_event_new_new_segment (TRUE, 1.0, GST_FORMAT_TIME, 0, -1, 0 ) );

     // go to the next program chain

     src->unique_setup = FALSE;

     src->update_prog_chain = TRUE;

     gst_mythtv_src_next_program_chain( src );

     return TRUE;

   }

 }

 /* create a new socket for connecting to the next program chain */

 static gboolean

 gst_mythtv_src_next_program_chain ( GstMythtvSrc *src )

 {

   GString *chain_id_local = NULL;

   gboolean ret = TRUE;

   if ( !src->live_tv )

     goto init_failed;

   if (src->unique_setup == FALSE) {

     src->unique_setup = TRUE;

   } else {

     goto done;

   }

 	GST_PAD_STREAM_LOCK( GST_BASE_SRC_PAD (GST_BASE_SRC (src)) );

   if (src->file_transfer) {

     g_object_unref (src->file_transfer);

     src->file_transfer = NULL;

   }

   if (src->uri_name) {

     g_free (src->uri_name);

   }

   if ( src->backend_info == NULL )  

   	src->backend_info = gmyth_backend_info_new_with_uri( src->uri_name );

   if ( src->live_tv ) {

     if ( gmyth_livetv_next_program_chain( src->spawn_livetv ) == FALSE ) {

     	GST_INFO_OBJECT( src, "\n\n[%s]\t\tFailed to go to the next program chain!!!\n\n", __FUNCTION__ );

       ret = FALSE;

       goto init_failed;

     }

     /* set up the uri variable */

     src->uri_name = g_strdup( src->spawn_livetv->proginfo->pathname->str );

     chain_id_local = gmyth_tvchain_get_id( src->spawn_livetv->tvchain );

     if ( chain_id_local != NULL ) {

       src->live_chain_id = g_strdup( chain_id_local->str );

       GST_DEBUG_OBJECT( src, "\t[%s]\tLocal chain ID = %s.\n", __FUNCTION__, src->live_chain_id );

     }

     src->live_tv_id = src->spawn_livetv->recorder->recorder_num;

     GST_LOG_OBJECT( src, "[%s] LiveTV id = %d, URI path = %s.\n", __FUNCTION__, src->live_tv_id, src->uri_name );

   }

   src->file_transfer = gmyth_file_transfer_new(src->backend_info);

   if ( src->file_transfer == NULL ) {

     goto init_failed;

   }

 	ret = gmyth_file_transfer_open( src->file_transfer, src->uri_name );

   /* sets the Playback monitor connection */

   //ret = gmyth_file_transfer_playback_setup( &(src->file_transfer), src->live_tv );

   if ( src->live_tv == TRUE && ret == TRUE ) {

     /* loop finished, set the max tries variable to zero again... */

     wait_to_transfer = 0;

     g_usleep( 200 );

     while ( wait_to_transfer++ < GMYTHTV_TRANSFER_MAX_WAITS && 

 				( gmyth_livetv_is_recording( src->spawn_livetv ) == FALSE ) )

       g_usleep( 1000 );

   }

   /* sets the FileTransfer instance connection (video/audio download) */

   //ret = gmyth_file_transfer_setup( &(src->file_transfer), src->live_tv );

   if ( ret == FALSE ) {

 #ifndef GST_DISABLE_GST_DEBUG  

     if ( src->mythtv_msgs_dbg )

       GST_ERROR_OBJECT( src, "MythTV FileTransfer request failed when setting up socket connection!\n" );  	  

 #endif

     goto begin_req_failed;

   }

   src->content_size_last = src->content_size;

   src->content_size = src->file_transfer->filesize;

   if ( src->live_tv ) {

   	wait_to_transfer = 0;

 	  while ( wait_to_transfer++ < GMYTHTV_TRANSFER_MAX_WAITS && src->content_size < GMYTHTV_TRANSFER_MAX_BUFFER )

 	    src->content_size = gst_mythtv_src_get_position( src );

   }

   src->read_offset = 0;  

   if ( src->bytes_queue != NULL ) {

   	g_byte_array_free( src->bytes_queue, TRUE );

   }

   src->bytes_queue = g_byte_array_sized_new( INTERNAL_BUFFER_SIZE );

   //gst_pad_push_event ( GST_BASE_SRC_PAD (GST_BASE_SRC (src)),

 	//		gst_event_new_new_segment ( TRUE, 1.0, GST_FORMAT_TIME, 0, src->content_size, 0 ) );

 done:

 	src->update_prog_chain = FALSE;

 	GST_PAD_STREAM_UNLOCK( GST_BASE_SRC_PAD (GST_BASE_SRC (src)) );

   return TRUE;

   /* ERRORS */

 init_failed:

   {

     if (src->spawn_livetv != NULL )

       g_object_unref( src->spawn_livetv );

     GST_ELEMENT_ERROR (src, LIBRARY, INIT,

 	(NULL), ("Could not initialize MythTV library (%i, %s)", ret, src->uri_name));

     return FALSE;

   }

 begin_req_failed:

   {

     GST_ELEMENT_ERROR (src, LIBRARY, INIT,

 	(NULL), ("Could not begin request sent to MythTV server (%i, %s)", ret, src->uri_name));

     return FALSE;

   }

 }

 static gboolean

 gst_mythtv_src_get_size (GstBaseSrc * bsrc, guint64 * size)

 {

   GstMythtvSrc *src = GST_MYTHTV_SRC (bsrc);

   gboolean ret = TRUE;

   GST_LOG_OBJECT( src, "[%s] Differs from previous content size: %d (max.: %d)\n", __FUNCTION__, 

   			abs( src->content_size - src->prev_content_size ), GMYTHTV_TRANSFER_MAX_BUFFER );

   if ( src->live_tv ) {

   	ret = FALSE;

 	} else if ( src->live_tv && src->enable_timing_position && ( abs( src->content_size - src->bytes_read ) < 

 				GMYTHTV_TRANSFER_MAX_BUFFER ) ) {

     gint64 new_offset = gmyth_recorder_get_file_position( src->spawn_livetv->recorder );

     if ( new_offset > 0 && new_offset > src->content_size ) {

 			src->content_size = new_offset;

     } else if ( new_offset < src->content_size ) {

 			src->update_prog_chain = TRUE;

 	  }

   }

   *size = src->content_size;

   GST_LOG_OBJECT( src, "[%s] Content size = %lld\n", __FUNCTION__, src->content_size );

   return ret;

 }

 /* close the socket and associated resources

  * used both to recover from errors and go to NULL state */

 static gboolean

 gst_mythtv_src_stop (GstBaseSrc * bsrc)

 {

   GstMythtvSrc *src;

   src = GST_MYTHTV_SRC (bsrc);

   if (src->uri_name) {

     g_free (src->uri_name);

     src->uri_name = NULL;

   }

   if (src->mythtv_caps) {

     gst_caps_unref (src->mythtv_caps);

     src->mythtv_caps = NULL;

   }

   src->eos = FALSE;

   return TRUE;

 }

 static gboolean

 gst_mythtv_src_handle_event (GstPad * pad, GstEvent * event)

 {

   GstMythtvSrc *src = GST_MYTHTV_SRC (GST_PAD_PARENT (pad));

   gint64 cont_size = 0;

   gboolean ret = FALSE;

   switch (GST_EVENT_TYPE (event)) {

     case GST_EVENT_EOS:

       GST_WARNING_OBJECT( src, "[%s] Got EOS event!!!\n", __FUNCTION__ );

       if ( src->live_tv ) {

 	cont_size = gst_mythtv_src_get_position (src);

 	if ( cont_size > src->content_size ) {

 	  src->content_size = cont_size;

 	  src->eos = FALSE;

 	} else {

 	  src->eos = TRUE;

 	  gst_element_set_state ( GST_ELEMENT (src), GST_STATE_NULL );

 	  gst_element_set_locked_state ( GST_ELEMENT (src), FALSE );

 	}

       }

       break;

     default:

       ret = gst_pad_event_default (pad, event);

   }

   return ret;

 }

 static gboolean

 gst_mythtv_src_is_seekable( GstBaseSrc *push_src )

 {

   return TRUE;

 }

 static gboolean

 gst_mythtv_src_handle_query (GstPad * pad, GstQuery * query)

 {

   gboolean res = FALSE;

   GstMythtvSrc *myth = GST_MYTHTV_SRC (gst_pad_get_parent (pad));

   GstFormat formt;

   switch (GST_QUERY_TYPE (query)) {

     case GST_QUERY_POSITION:

     {

     	gint64 pos = -1;

       gst_query_parse_position (query, &formt, &pos );

       res = TRUE;

       if ( formt == GST_FORMAT_BYTES ) {

       	gst_query_set_position (query, formt, pos = myth->read_offset );

       	GST_DEBUG_OBJECT (myth, "POS %lld (BYTES).\n", pos );

       } else if ( formt == GST_FORMAT_TIME ) {

       	GST_DEBUG_OBJECT (myth, "POS %lld (TIME).\n", pos );

       	res = gst_pad_query_default(pad, query);

       }

       break;

     }

     case GST_QUERY_DURATION:

     {

 #if 0

       if (myth->duration != 0) {

 	gint64 total;

 	gint64 fps;

 	fps = nuv->h->i_fpsn / nuv->h->i_fpsd;

 	total = gst_util_uint64_scale_int (GST_SECOND, nuv->h->i_video_blocks, fps);

       }

 #endif

 	gint64 dur = -1;

 	gst_query_parse_duration ( query, &formt, &dur );	

   if ( formt == GST_FORMAT_BYTES ) {

   	gst_query_set_duration (query, formt, dur = myth->content_size);

   	GST_DEBUG_OBJECT (myth, "DURATION %lld (BYTES).\n", dur );

   } else if ( formt == GST_FORMAT_TIME ) {

   	GST_DEBUG_OBJECT (myth, "DURATION %lld (TIME).\n", dur );

   	gst_query_ref(query);

   	res = gst_pad_query_default(pad, query);  	

   }

 	res = TRUE;

       break;

     }

     default:

     {

       res = gst_pad_query_default(pad, query);

       break;

     }

   }

   gst_object_unref (myth);

   return res;

 }

 static GstStateChangeReturn

 gst_mythtv_src_change_state (GstElement * element, GstStateChange transition)

 {

   GstStateChangeReturn ret = GST_STATE_CHANGE_FAILURE;//GST_STATE_CHANGE_NO_PREROLL;

   GstMythtvSrc *src = GST_MYTHTV_SRC (element);

   switch (transition) {

     case GST_STATE_CHANGE_NULL_TO_READY:

       //src->do_start = TRUE;

       //src->unique_setup = FALSE;

       break;

     case GST_STATE_CHANGE_READY_TO_PAUSED:

     	GST_INFO_OBJECT( src, "[%s] READY to PAUSED called!\n", __FUNCTION__ );

     	break;

     case GST_STATE_CHANGE_PAUSED_TO_PLAYING:

     	GST_INFO_OBJECT( src, "[%s] PAUSED to PLAYING called!\n", __FUNCTION__ );

       if ( src->live_tv ) {

 	      if ( !gmyth_recorder_send_frontend_ready_command( src->spawn_livetv->recorder ) )

 	      	GST_WARNING_OBJECT( src, "[%s] Couldn't send the FRONTEND_READY message to the backend!", __FUNCTION__ );

 	      else

 	      	GST_DEBUG_OBJECT( src, "[%s] Message FRONTEND_READY was sent to the backend!", __FUNCTION__ );

       }

       break;

     default:

       break;

   }

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

   if (ret == GST_STATE_CHANGE_FAILURE)

     return ret;

   switch (transition) {

     case GST_STATE_CHANGE_READY_TO_NULL:

       GST_INFO_OBJECT( src, "[%s] READY to NULL called!\n", __FUNCTION__ );

       break;

     case GST_STATE_CHANGE_PLAYING_TO_PAUSED:

       GST_INFO_OBJECT( src, "[%s] PLAYING to PAUSED called!\n", __FUNCTION__ );

     case GST_STATE_CHANGE_PAUSED_TO_READY:

       GST_INFO_OBJECT( src, "[%s] PAUSED to READY called!\n", __FUNCTION__ );

       if ( src->live_tv ) {

 	      if ( !gmyth_recorder_send_frontend_ready_command( src->spawn_livetv->recorder ) )

 	      	GST_WARNING_OBJECT( src, "[%s] Couldn't send the FRONTEND_READY message to the backend!", __FUNCTION__ );

 	      else

 	      	GST_DEBUG_OBJECT( src, "[%s] Message FRONTEND_READY was sent to the backend!", __FUNCTION__ );

       /*

   			gst_pad_push_event ( GST_BASE_SRC_PAD (GST_BASE_SRC (src)),

       			gst_event_new_new_segment (TRUE, 1.0, GST_FORMAT_TIME, 0, -1, 0 ) );

 				src->read_offset = 0;

 				src->bytes_read = 0;

 				src->unique_setup = FALSE;				

 				gst_mythtv_src_next_program_chain( src );

 				*/

       }

       break;

     default:

       break;

   }

   return ret;

 }

 static void

 gst_mythtv_src_set_property (GObject * object, guint prop_id,

     const GValue * value, GParamSpec * pspec)

 {

   GstMythtvSrc *mythtvsrc = GST_MYTHTV_SRC (object);

   GST_OBJECT_LOCK (mythtvsrc);

   switch (prop_id) {

     case PROP_URI:

     case PROP_LOCATION:

       {

 	if (!g_value_get_string (value)) {

 	  GST_WARNING ("location property cannot be NULL");

 	  goto done;

 	}

 	if (mythtvsrc->uri_name != NULL) {

 	  g_free (mythtvsrc->uri_name);

 	  mythtvsrc->uri_name = NULL;

 	}

 	mythtvsrc->uri_name = g_value_dup_string (value);

 	break;

       }

 #ifndef GST_DISABLE_GST_DEBUG

     case PROP_GMYTHTV_DBG:

       {

 	mythtvsrc->mythtv_msgs_dbg = g_value_get_boolean (value);

 	break;

       }

 #endif

     case PROP_GMYTHTV_VERSION:

       {

 	mythtvsrc->mythtv_version = g_value_get_int (value);

 	break;

       }

     case PROP_GMYTHTV_LIVEID:

       {

 	mythtvsrc->live_tv_id = g_value_get_int (value);

 	break;

       }

     case PROP_GMYTHTV_LIVE:

       {

 	mythtvsrc->live_tv = g_value_get_boolean (value);

 	break;

       }

     case PROP_GMYTHTV_ENABLE_TIMING_POSITION:

       {

 	mythtvsrc->enable_timing_position = g_value_get_boolean (value);

 	break;

       }      

     case PROP_GMYTHTV_LIVE_CHAINID:

       {

 	if (!g_value_get_string (value)) {

 	  GST_WARNING ("MythTV Live chainid property cannot be NULL");

 	  goto done;

 	}

 	if (mythtvsrc->live_chain_id != NULL) {

 	  g_free (mythtvsrc->live_chain_id);

 	  mythtvsrc->live_chain_id = NULL;

 	}

 	mythtvsrc->live_chain_id = g_value_dup_string (value);

 	break;

       }

     case PROP_GMYTHTV_CHANNEL_NUM:

       {

 	mythtvsrc->channel_num = g_value_get_int (value);

 	break;

       }

     default:

       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

       break;

   }

   GST_OBJECT_UNLOCK (mythtvsrc);

 done:

   return;

 }

 static void

 gst_mythtv_src_get_property (GObject * object, guint prop_id,

     GValue * value, GParamSpec * pspec)

 {

   GstMythtvSrc *mythtvsrc = GST_MYTHTV_SRC (object);

   GST_OBJECT_LOCK (mythtvsrc);

   switch (prop_id) {

     case PROP_URI:

     case PROP_LOCATION:

       {

 	gchar *str = g_strdup( "" );

 	if ( mythtvsrc->uri_name == NULL ) {

 	  g_free (mythtvsrc->uri_name);

 	  mythtvsrc->uri_name = NULL;

 	} else {

 	  str = g_strdup( mythtvsrc->uri_name );

 	}

 	g_value_set_string ( value, str );

 	break;

       }

 #ifndef GST_DISABLE_GST_DEBUG

     case PROP_GMYTHTV_DBG:

       g_value_set_boolean ( value, mythtvsrc->mythtv_msgs_dbg );

       break;

 #endif

     case PROP_GMYTHTV_VERSION:

       {

 	g_value_set_int ( value, mythtvsrc->mythtv_version );

 	break;

       }

     case PROP_GMYTHTV_LIVEID:

       {

 	g_value_set_int ( value, mythtvsrc->live_tv_id );

 	break;

       }

     case PROP_GMYTHTV_LIVE:

       g_value_set_boolean ( value, mythtvsrc->live_tv );

       break;

     case PROP_GMYTHTV_ENABLE_TIMING_POSITION:

       g_value_set_boolean ( value, mythtvsrc->enable_timing_position );

       break;

     case PROP_GMYTHTV_LIVE_CHAINID:

       {

 	gchar *str = g_strdup( "" );

 	if ( mythtvsrc->live_chain_id == NULL ) {

 	  g_free (mythtvsrc->live_chain_id);

 	  mythtvsrc->live_chain_id = NULL;

 	} else {

 	  str = g_strdup( mythtvsrc->live_chain_id );

 	}

 	g_value_set_string ( value, str );

 	break;

       }

     case PROP_GMYTHTV_CHANNEL_NUM:

       {

 	g_value_set_int ( value, mythtvsrc->channel_num );

 	break;

       }

     default:

       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

       break;

   }

   GST_OBJECT_UNLOCK (mythtvsrc);

 }

 /* entry point to initialize the plug-in

  * initialize the plug-in itself

  * register the element factories and pad templates

  * register the features

  */

 static gboolean

 plugin_init (GstPlugin * plugin)

 {

   return gst_element_register (plugin, "mythtvsrc", GST_RANK_NONE,

       GST_TYPE_MYTHTV_SRC);

 }

 /* this is the structure that gst-register looks for

  * so keep the name plugin_desc, or you cannot get your plug-in registered */

 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,

     GST_VERSION_MINOR,

     "mythtv",

     "lib MythTV src",

     plugin_init, VERSION, "LGPL", "GStreamer", "http://gstreamer.net/")

 /*** GSTURIHANDLER INTERFACE *************************************************/

   static guint 

 gst_mythtv_src_uri_get_type (void)

 {

   return GST_URI_SRC;

 }

   static gchar **

 gst_mythtv_src_uri_get_protocols (void)

 {

   static gchar *protocols[] = { "myth", "myths", NULL };

   return protocols;

 }

   static const gchar *

 gst_mythtv_src_uri_get_uri (GstURIHandler * handler)

 {

   GstMythtvSrc *src = GST_MYTHTV_SRC (handler);

   return src->uri_name;

 }

   static gboolean

 gst_mythtv_src_uri_set_uri (GstURIHandler * handler, const gchar * uri)

 {

   GstMythtvSrc *src = GST_MYTHTV_SRC (handler);

   gchar *protocol;

   protocol = gst_uri_get_protocol (uri);

   if ((strcmp (protocol, "myth") != 0) && (strcmp (protocol, "myths") != 0)) {

     g_free (protocol);

     return FALSE;

   }

   g_free (protocol);

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

   return TRUE;

 }

  static void

 gst_mythtv_src_uri_handler_init (gpointer g_iface, gpointer iface_data)

 {

   GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;

   iface->get_type = gst_mythtv_src_uri_get_type;

   iface->get_protocols = gst_mythtv_src_uri_get_protocols;

   iface->get_uri = gst_mythtv_src_uri_get_uri;

   iface->set_uri = gst_mythtv_src_uri_set_uri;

 }

   void

 size_header_handler (void *userdata, const char *value)

 {

   GstMythtvSrc *src = GST_MYTHTV_SRC (userdata);

   //src->content_size = g_ascii_strtoull (value, NULL, 10);

   GST_DEBUG_OBJECT (src, "content size = %lld bytes", src->content_size);

 }