/* 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 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-mythtvsrc

  *

  * <refsect2>

  * <para>

  * MythTVSrc allows to access a remote MythTV backend streaming Video/Audio server,

  * and to render audio and video content through a TCP/IP connection to a specific

  * port on this server, and based on a known MythTV protocol that is based on 

  * some message passing, such as REQUEST_BLOCK on a specified number of bytes, to get

  * some chunk of remote file data.

  * You should pass the information aboute the remote MythTV backend server 

  * through the <link linkend="GstMythTVSrc--location">location</link> property.

  * </para>

  * <title>Examples</title>

  * <para>

  * If you want to get the LiveTV content (set channel, TV tuner, RemoteEncoder, 

  * Recorder),

  * put the following URI:

  * 

  * <programlisting> 

  *  myth://xxx.xxx.xxx.xxx:6543/livetv?channel=BBC

  * </programlisting>

  *

  * This URI will say to the gmyth library to configure the Recorder instance (used to

  * change the channel, start the TV multimedia content transmition, etc.), using

  * the IP address (xxx.xxx.xxx.xxx) and port number (6543) of the MythTV backend 

  * server, and setting the channel name to "BBC". 

  * 

  * To get a already recorded the MythTV NUV file, put the following URI:

  * 

  * <programlisting>

  *  myth://xxx.xxx.xxx.xxx:6543/filename.nuv

  * </programlisting>

  *

  * This URI will say to the gmyth library to configure the Recorder instance (used to

  * change the channel, start the TV multimedia content transmition, etc.), using

  * the IP address (xxx.xxx.xxx.xxx) and port number (6543) of the MythTV backend 

  * server, and setting the channel name to "BBC".

  * 

  * Another possible way to use the LiveTV content, and just in the case you want to 

  * use the mysql database, put the location URI in the following format:

  * 

  * <programlisting> 

  *  myth://mythtv:mythtv@xxx.xxx.xxx.xxx:6543/?mythconverg&channel=9

  * </programlisting>

  * 

  * 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).

  * </para>

  * </refsect2>

  */

 #ifdef HAVE_CONFIG_H

 #include "config.h"

 #endif

 #include "gstmythtvsrc.h"

 #include <gmyth/gmyth_file.h>

 #include <gmyth/gmyth_file_transfer.h>

 #include <gmyth/gmyth_file_local.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_DEFAULT_NUM     (-1)

 #define GMYTHTV_VERSION_DEFAULT			        30

 #define GMYTHTV_TRANSFER_MAX_WAITS          100

 #define GMYTHTV_TRANSFER_MAX_RESENDS        2

 #define GMYTHTV_TRANSFER_MAX_BUFFER         (128*1024)

 #define MAX_READ_SIZE                       (4*1024)

 #define GST_FLOW_ERROR_NO_DATA              (-101)

 #define REQUEST_MAX_SIZE                    (64*1024)

 #define INTERNAL_BUFFER_SIZE                (90*1024)

 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,

 #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,

   PROP_GMYTHTV_MAX_TRY

 };

 static void gst_mythtv_src_clear (GstMythtvSrc *mythtv_src);

 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 gboolean gst_mythtv_src_do_seek (GstBaseSrc * base,

     GstSegment * segment);

 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 GMythFileReadResult do_read_request_response (GstMythtvSrc * src, guint size,

     GByteArray * data_ptr);

 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_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_string ("mythtv-channel", "mythtv-channel",

           "Change MythTV channel number",

           "", G_PARAM_READWRITE));

   g_object_class_install_property

       (gobject_class, PROP_GMYTHTV_MAX_TRY,

       g_param_spec_int ("max-try", "max-try",

           "Set the max try for get MythTV free recorder",

           0, G_MAXINT, 10,  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->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 = 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->update_prog_chain = FALSE;

   this->channel_name = NULL;

   this->eos = FALSE;

   this->bytes_queue = NULL;

   this->wait_to_transfer = 0;

   this->try_number = 0;

   this->max_try = 10;

   gst_base_src_set_format (GST_BASE_SRC (this), GST_FORMAT_BYTES);

   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_clear (GstMythtvSrc *mythtv_src)

 {

   mythtv_src->unique_setup = FALSE;

   mythtv_src->try_number = 0;

   if (mythtv_src->spawn_livetv) {

     g_object_unref (mythtv_src->spawn_livetv);

     mythtv_src->spawn_livetv = NULL;

   }

   if (mythtv_src->file) {

     g_object_unref (mythtv_src->file);

     mythtv_src->file = NULL;

   }

   if (mythtv_src->backend_info) {

     g_object_unref (mythtv_src->backend_info);

     mythtv_src->backend_info = NULL;

   }

   if (mythtv_src->bytes_queue) {

     g_byte_array_free (mythtv_src->bytes_queue, TRUE);

     mythtv_src->bytes_queue = NULL;

   }

 }

 static void

 gst_mythtv_src_finalize (GObject * gobject)

 {

   GstMythtvSrc *this = GST_MYTHTV_SRC (gobject);

   gst_mythtv_src_clear (this);

   if (this->uri_name) {

     g_free (this->uri_name);

     this->uri_name = NULL;

   }

   if (this->user_agent) {

     g_free (this->user_agent);

     this->user_agent = NULL;

   }

   G_OBJECT_CLASS (parent_class)->finalize (gobject);

 }

 static GMythFileReadResult

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

 {

   gint read = 0;

   guint sizetoread = size;

   gint max_iters = GMYTHTV_TRANSFER_MAX_RESENDS;

   GMythFileReadResult result;

   GST_LOG_OBJECT (src, "Starting: Reading %d bytes...", sizetoread);

   /* Loop sending the Myth File Transfer request:

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

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

     /* if ( gmyth_backend_info_is_local_file(src->backend_info) ) */

     if ( IS_GMYTH_FILE_LOCAL(src->file) )

       result = gmyth_file_local_read ( GMYTH_FILE_LOCAL(src->file),

           data_ptr, sizetoread, src->live_tv);      

     else if ( IS_GMYTH_FILE_TRANSFER(src->file) )

       result = gmyth_file_transfer_read ( GMYTH_FILE_TRANSFER(src->file),

           data_ptr, sizetoread, src->live_tv);

     if (data_ptr->len > 0) {

       read += data_ptr->len;

       sizetoread -= data_ptr->len;

     } else if (data_ptr->len < 0) {

       if (src->live_tv == FALSE) {

         result = GMYTH_FILE_READ_EOF;

         goto eos;

       } else {

         if (result == GMYTH_FILE_READ_ERROR) {  /* -314 */

           GST_INFO_OBJECT (src, "[LiveTV] FileTransfer READ_ERROR!");

           goto done;

         } else if (result == GMYTH_FILE_READ_NEXT_PROG_CHAIN) {      /* -315 */

           GST_INFO_OBJECT (src,

               "[LiveTV] FileTransfer - Go to the next program chain!");

           continue;

         }

         goto done;

       }

     } else if (data_ptr->len == 0)

       goto done;

     if (read == sizetoread)

       goto done;

   }

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

     result = GMYTH_FILE_READ_EOF;

     goto eos;

   }

   goto done;

 eos:

   src->eos = TRUE;

 done:

   return result;

 }

 static GstFlowReturn

 gst_mythtv_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)

 {

   GstMythtvSrc *src;

   GstFlowReturn ret = GST_FLOW_OK;

   guint buffer_size_inter = 0;

   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;

   GST_DEBUG_OBJECT (src, "offset = %" G_GUINT64_FORMAT ", size = %d...",

       src->read_offset, MAX_READ_SIZE);

   GST_DEBUG_OBJECT (src, "Create: buffer_remain: %d, buffer_size = %d.",

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

 program_chain_changed:

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

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

   	GByteArray *buffer;

     GMythFileReadResult result = GMYTH_FILE_READ_OK;

     buffer = NULL;

     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 ();

     result = do_read_request_response (src, buffer_size_inter, buffer);

     if (G_UNLIKELY (buffer->len < 0)) {

     	if (buffer != NULL) {

 	      g_byte_array_free (buffer, TRUE);

 	      buffer = NULL;

 	    }

       if (src->live_tv || ( result == GMYTH_FILE_READ_NEXT_PROG_CHAIN ))

         goto change_progchain;

       else

         goto read_error;

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

     	if (buffer != NULL) {

 	      g_byte_array_free (buffer, TRUE);

 	      buffer = NULL;

 	    }

       if (!src->live_tv)

         goto done;

       else

         goto program_chain_changed;

     }

     if (G_UNLIKELY (src->update_prog_chain))

     {

     	if (buffer != NULL) {

 	      g_byte_array_free (buffer, TRUE);

 	      buffer = NULL;

 	    }

       goto change_progchain;      

     }

     src->bytes_queue =

         g_byte_array_append (src->bytes_queue, buffer->data, buffer->len);

     if (buffer->len > buffer_size_inter)

       GST_WARNING_OBJECT (src,

           "INCREASED buffer size! Backend sent more than we ask him... (%d)",

           abs (buffer->len - buffer_size_inter));

     src->buffer_remain += buffer->len;

     if (buffer != NULL) {

       g_byte_array_free (buffer, TRUE);

       buffer = NULL;

     }

     GST_DEBUG_OBJECT (src,

         "BYTES READ (actual) = %d, BYTES READ (cumulative) = %llu, "

         "OFFSET = %llu, CONTENT SIZE = %llu.", 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;

   *outbuf = gst_buffer_new ();

   /* 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, "read from network? %s!, buffer_remain = %d",

       (buffer_size_inter ==

           0) ? "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, "Buffer output with size: %d",

       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: BUFFER --->SIZE = %d, OFFSET = %llu, "

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

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

   GST_DEBUG_OBJECT (src, "CONTENT_SIZE = %llu, BYTES_READ = %llu.",

       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));

 /*

     TODO: need to send a new segment event to NUVDemux? 

     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));

 */

     goto program_chain_changed;

   }

 }

 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, "GET_POSITION: file_position = %lld", 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, "seek, segment: %" GST_SEGMENT_FORMAT, segment);

   if (segment->format == GST_FORMAT_TIME) {

     goto done;

   }

   GST_LOG_OBJECT (src,

       "Trying to seek at the value (actual_seek = %lld, read_offset = %lld)",

       actual_seek, src->read_offset);

   /* verify if it needs to seek */

   if (src->read_offset != actual_seek) {

     /* if ( gmyth_backend_info_is_local_file(src->backend_info) ) */

     if ( IS_GMYTH_FILE_LOCAL(src->file) )

       new_offset =

           gmyth_file_local_seek ( GMYTH_FILE_LOCAL(src->file), segment->start, G_SEEK_SET);

     else if ( IS_GMYTH_FILE_TRANSFER(src->file) )

       new_offset =

           gmyth_file_transfer_seek ( GMYTH_FILE_TRANSFER(src->file), segment->start, SEEK_SET);

     GST_LOG_OBJECT (src,

         "Segment offset start = %lld, SRC Offset = %lld, NEW actual backend SEEK Offset = %lld.",

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

     if (G_UNLIKELY (new_offset < 0)) {

       ret = FALSE;

       if (!src->live_tv)

         goto eos;

     }

     src->read_offset = new_offset;

     if (ret == FALSE) {

       GST_INFO_OBJECT (src, "Failed to set the SEEK on segment!");

     }

   }

 done:

   return ret;

 eos:

   {

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

     return FALSE;

   }

 }

 /* 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;  

   GMythURI *gmyth_uri = NULL;

   gboolean ret = TRUE;

   if (src->unique_setup == FALSE) {

     src->unique_setup = TRUE;

   } else {

     goto done;

   }

   gmyth_uri = gmyth_uri_new_with_value (src->uri_name);

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

   src->live_tv = gmyth_uri_is_livetv( gmyth_uri );

   /* testing UPnP... */

   /* gmyth_backend_info_set_hostname( src->backend_info, NULL ); */

   if ( src->live_tv ) {

     src->spawn_livetv = gmyth_livetv_new (src->backend_info);

     gchar* ch = gmyth_uri_get_channel_name( gmyth_uri );

     if ( ch != NULL )

     	src->channel_name = ch;

     if (src->channel_name != NULL) {

       if (gmyth_livetv_channel_name_setup (src->spawn_livetv, src->channel_name) == FALSE) {

         GST_INFO_OBJECT (src, "LiveTV setup felt down on error");

         ret = FALSE;

         goto init_failed;

       }

     } else {

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

         GST_INFO_OBJECT (src, "LiveTV setup felt down on error");

         ret = FALSE;

         goto init_failed;

       }

     }

     /* testing change channel... */

     /* gmyth_recorder_change_channel( src->spawn_livetv->recorder, CHANNEL_DIRECTION_UP ); */

     src->file = GMYTH_FILE( gmyth_livetv_create_file_transfer (src->spawn_livetv) );

     if (NULL == src->file) {

       GST_INFO_OBJECT (src, "[LiveTV] FileTransfer equals to NULL");

       ret = FALSE;

       goto init_failed;

     }

     /* Check if the file is local to this specific client renderer */

     if ( gmyth_uri_is_local_file(gmyth_uri) )

       ret = gmyth_file_local_open( GMYTH_FILE_LOCAL(src->file) );

     else

       ret = gmyth_file_transfer_open( GMYTH_FILE_TRANSFER(src->file), src->spawn_livetv->uri != NULL ? 

                 gmyth_uri_get_path(src->spawn_livetv->uri) : 

                 src->spawn_livetv->proginfo->pathname->str );

     /* sets the mythtvsrc "location" property */

     g_object_set (src, "location", gmyth_file_get_uri (src->file), NULL);

 		if ( !ret )

 		{

 			GST_INFO_OBJECT (src, "Error: couldn't open the FileTransfer from LiveTV source!" );

 			g_object_unref( src->file );

 			src->file = NULL;

 			goto init_failed;

 		}

   } else {

     /* Check if the file is local to this specific client renderer, and tries to open

      * a local connection

      */

     if ( gmyth_uri_is_local_file(gmyth_uri) )

     {

       src->file = GMYTH_FILE(gmyth_file_local_new(src->backend_info));

       ret = gmyth_file_local_open ( GMYTH_FILE_LOCAL( src->file ) );

     } else {

       src->file = GMYTH_FILE(gmyth_file_transfer_new(src->backend_info));

       ret = gmyth_file_transfer_open ( GMYTH_FILE_TRANSFER(src->file), src->uri_name );

     }

   } /* if (else) - recorded FileTransfer */

   if (NULL == src->file) {

     GST_INFO_OBJECT (src, "FileTransfer is NULL");

     goto init_failed;

   }

   /*GST_INFO_OBJECT( src, "uri = %s", src->spawn_livetv->file); */

   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!");

 #endif

     goto begin_req_failed;

   }

   GST_INFO_OBJECT (src,

       "MythTV FileTransfer filesize = %lld, content_size = %lld!",

       gmyth_file_get_filesize( src->file ), src->content_size);

   src->content_size = gmyth_file_get_filesize (src->file);

   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 (gmyth_uri != NULL)

 	{

   	    g_object_unref (gmyth_uri);

       	gmyth_uri = NULL;

 	}

     if (chain_id_local != NULL) {

         g_string_free (chain_id_local, TRUE);

         chain_id_local = NULL;

     }

     return TRUE;

     /* ERRORS */

 init_failed:

 	if (gmyth_uri != NULL)

 	{

   	    g_object_unref (gmyth_uri);

       	gmyth_uri = NULL;

 	}

     if (src->spawn_livetv != NULL) {

         g_object_unref (src->spawn_livetv);

         src->spawn_livetv = NULL;

     }

     /*

     GST_ELEMENT_ERROR (src, LIBRARY, INIT,

             (NULL), ("Could not initialize MythTV library (%i, %s)", ret,

             src->uri_name));

     */            

     if  (++src->try_number <= src->max_try) {

        gst_mythtv_src_clear (src);

        GST_DEBUG_OBJECT (src, "Starting new try for get free recorder on MythTV");

        g_usleep (0.5 * G_USEC_PER_SEC);

        return gst_mythtv_src_start (bsrc);

     }

     return FALSE;

 begin_req_failed:

 	if (gmyth_uri != NULL)

 	{

   	    g_object_unref (gmyth_uri);

       	gmyth_uri = NULL;

 	}

     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, "Differs from previous content size: %d (max.: %d)",

       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, "Content size = %lld", 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 = GST_MYTHTV_SRC (bsrc);

   gst_mythtv_src_clear (src);

   /* 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, "Got EOS event");

       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:

     {

       gst_query_parse_position (query, &formt, NULL);

       if (formt == GST_FORMAT_BYTES) {

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

         GST_DEBUG_OBJECT (myth, "POS %" G_GINT64_FORMAT, myth->read_offset);

         res = TRUE;

       } else if (formt == GST_FORMAT_TIME) {

         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

       gst_query_parse_duration (query, &formt, NULL);

       if (formt == GST_FORMAT_BYTES) {

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

         GST_DEBUG_OBJECT (myth, "SIZE %" G_GINT64_FORMAT, myth->content_size);

         res = TRUE;

       } else if (formt == GST_FORMAT_TIME) {

         res = gst_pad_query_default (pad, query);

       }

       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;

   GstMythtvSrc *src = GST_MYTHTV_SRC (element);

   switch (transition) {

     case GST_STATE_CHANGE_NULL_TO_READY:

       break;

     case GST_STATE_CHANGE_READY_TO_PAUSED:

     case GST_STATE_CHANGE_PAUSED_TO_PLAYING:

       if (src->live_tv) {

         if (!gmyth_recorder_send_frontend_ready_command (src->spawn_livetv->

                 recorder))

           GST_WARNING_OBJECT (src,

               "Couldn't send the FRONTEND_READY message to the backend!");

         else

           GST_DEBUG_OBJECT (src, "FRONTEND_READY was sent to the backend");

       }

       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:

       break;

     case GST_STATE_CHANGE_PLAYING_TO_PAUSED:

     case GST_STATE_CHANGE_PAUSED_TO_READY:

       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_LOCATION:

     {

       if (!g_value_get_string (value)) {

         GST_WARNING ("location property cannot be NULL");

 	break;

       }

       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");

 	break;

       }

       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_name = g_value_dup_string (value);

       break;

     }

     case PROP_GMYTHTV_MAX_TRY:

     {

       mythtvsrc->max_try = g_value_get_int (value);

       break;

     }

     default:

       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

       break;

   }

   GST_OBJECT_UNLOCK (mythtvsrc);

 }

 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_LOCATION:

     {

       g_value_set_string (value, mythtvsrc->uri_name);

       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:

     {

       g_value_set_string (value, mythtvsrc->live_chain_id);

       break;

     }

     case PROP_GMYTHTV_CHANNEL_NUM:

     {

       g_value_set_string (value, mythtvsrc->channel_name);

       break;

     }

     case PROP_GMYTHTV_MAX_TRY:

     {

       g_value_set_int (value, mythtvsrc->max_try);

       break;

     }

     default:

       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

       break;

   }

   GST_OBJECT_UNLOCK (mythtvsrc);

 }

 static gboolean

 plugin_init (GstPlugin * plugin)

 {

   return gst_element_register (plugin, "mythtvsrc", GST_RANK_NONE,

       GST_TYPE_MYTHTV_SRC);

 }

 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,

     GST_VERSION_MINOR,

     "mythtv",

     "lib MythTV src",

     plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);

 /*** 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);

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

 }