/*

 * 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_ANY);

    /*

     * 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;

    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;

    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 athe next program chain!");

                    src->update_prog_chain = TRUE;

                    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;

    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);

        /*

         * got the next program info? 

         */

        if (G_UNLIKELY(src->update_prog_chain) || 

            (result == GMYTH_FILE_READ_NEXT_PROG_CHAIN)) {

            GST_DEBUG_OBJECT(src,

                             "Update PROGRAM CHAIN!!! buffer_size = %d.",

                             src->bytes_queue->len);

            gst_pad_push_event(GST_BASE_SRC_PAD(GST_BASE_SRC(psrc)),

                               gst_event_new_custom

                               (GST_EVENT_CUSTOM_DOWNSTREAM, NULL));

            /*

             * gst_pad_push_event (GST_BASE_SRC_PAD (GST_BASE_SRC (psrc)),

             * gst_event_new_new_segment (TRUE, 1.0, GST_FORMAT_BYTES, 0,

             * -1, 0)); 

             */

            src->update_prog_chain = FALSE;

            src->eos = FALSE;

            if (result == GMYTH_FILE_READ_NEXT_PROG_CHAIN) {

                /*

                 * if (buffer != NULL) { g_byte_array_free (buffer, TRUE);

                 * buffer = NULL; } goto program_chain_changed; 

                 */

            } else if (result == GMYTH_FILE_READ_OK) {

                /*

                 * remove wasteful, NUV file header data 

                 */

                /*

                 * buffer = g_byte_array_remove_range( buffer, 0, 512 ); 

                 */

                /*

                 * 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_BYTES, 

                // 0, -1, 0));

                /*

                 * goto change_progchain; 

                 */

            }

        }

        /*

         */

        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(buffer->len == 0)) {

            if (buffer != NULL) {

                g_byte_array_free(buffer, TRUE);

                buffer = NULL;

            }

            if (!src->live_tv) {

                if (src->eos)

                    goto eos;

                else 

                    goto done;

            }

            else

                goto program_chain_changed;

        }

        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;

    buffer_size = (src->buffer_remain <  MAX_READ_SIZE) ? 

                   src->buffer_remain : 

                   MAX_READ_SIZE;

    *outbuf = gst_buffer_new();

    /*

     * 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);

    if (src->eos  || 

        (!src->live_tv && (src->bytes_read >= src->content_size))

       )

        goto eos;

  done:

    {

        return ret;

    }

  eos:

    {

        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;

    GstMessage     *msg;

    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) {

            gboolean        result;

            result =

                gmyth_livetv_channel_name_setup(src->spawn_livetv,

                                                src->channel_name);

            if (result == 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);

    msg =

        gst_message_new_duration(GST_OBJECT(src), GST_FORMAT_BYTES,

                                 src->content_size);

    gst_element_post_message(GST_ELEMENT(src), msg);

    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));

    gst_mythtv_src_clear(src);

    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);