/* GStreamer

 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>

 * Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot org>

 *

 * 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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <gst/gst-i18n-plugin.h>

#include "gsttcp.h"

#include "gsttcpclientsrc.h"

#include <string.h>             /* memset */

#include <unistd.h>

#include <arpa/inet.h>

#include <fcntl.h>

GST_DEBUG_CATEGORY_STATIC (tcpclientsrc_debug);

#define GST_CAT_DEFAULT tcpclientsrc_debug

#define MAX_READ_SIZE                   4 * 1024

static const GstElementDetails gst_tcp_client_src_details =

GST_ELEMENT_DETAILS ("TCP client source",

    "Source/Network",

    "Receive data as a client over the network via TCP",

    "Thomas Vander Stichele <thomas at apestaart dot org>");

static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",

    GST_PAD_SRC,

    GST_PAD_ALWAYS,

    GST_STATIC_CAPS_ANY);

enum

{

  PROP_0,

  PROP_HOST,

  PROP_PORT,

  PROP_PROTOCOL

};

GST_BOILERPLATE (GstTCPClientSrc, gst_tcp_client_src, GstPushSrc,

    GST_TYPE_PUSH_SRC);

static void gst_tcp_client_src_finalize (GObject * gobject);

static GstCaps *gst_tcp_client_src_getcaps (GstBaseSrc * psrc);

static GstFlowReturn gst_tcp_client_src_create (GstPushSrc * psrc,

    GstBuffer ** outbuf);

static gboolean gst_tcp_client_src_stop (GstBaseSrc * bsrc);

static gboolean gst_tcp_client_src_start (GstBaseSrc * bsrc);

static gboolean gst_tcp_client_src_unlock (GstBaseSrc * bsrc);

static void gst_tcp_client_src_set_property (GObject * object, guint prop_id,

    const GValue * value, GParamSpec * pspec);

static void gst_tcp_client_src_get_property (GObject * object, guint prop_id,

    GValue * value, GParamSpec * pspec);

static void

gst_tcp_client_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_tcp_client_src_details);

}

static void

gst_tcp_client_src_class_init (GstTCPClientSrcClass * klass)

{

  GObjectClass *gobject_class;

  GstBaseSrcClass *gstbasesrc_class;

  GstPushSrcClass *gstpush_src_class;

  gobject_class = (GObjectClass *) klass;

  gstbasesrc_class = (GstBaseSrcClass *) klass;

  gstpush_src_class = (GstPushSrcClass *) klass;

  gobject_class->set_property = gst_tcp_client_src_set_property;

  gobject_class->get_property = gst_tcp_client_src_get_property;

  gobject_class->finalize = gst_tcp_client_src_finalize;

  g_object_class_install_property (gobject_class, PROP_HOST,

      g_param_spec_string ("host", "Host",

          "The host IP address to receive packets from", TCP_DEFAULT_HOST,

  g_object_class_install_property (gobject_class, PROP_PORT,

      g_param_spec_int ("port", "Port", "The port to receive packets from", 0,

  g_object_class_install_property (gobject_class, PROP_PROTOCOL,

      g_param_spec_enum ("protocol", "Protocol", "The protocol to wrap data in",

  gstbasesrc_class->get_caps = gst_tcp_client_src_getcaps;

  gstbasesrc_class->start = gst_tcp_client_src_start;

  gstbasesrc_class->stop = gst_tcp_client_src_stop;

  gstbasesrc_class->unlock = gst_tcp_client_src_unlock;

  gstpush_src_class->create = gst_tcp_client_src_create;

  GST_DEBUG_CATEGORY_INIT (tcpclientsrc_debug, "tcpclientsrc", 0,

      "TCP Client Source");

}

static void

gst_tcp_client_src_init (GstTCPClientSrc * this, GstTCPClientSrcClass * g_class)

{

  this->port = TCP_DEFAULT_PORT;

  this->host = g_strdup (TCP_DEFAULT_HOST);

  this->sock_fd.fd = -1;

  this->protocol = GST_TCP_PROTOCOL_NONE;

  this->caps = NULL;

  GST_OBJECT_FLAG_UNSET (this, GST_TCP_CLIENT_SRC_OPEN);

}

static void

gst_tcp_client_src_finalize (GObject * gobject)

{

  GstTCPClientSrc *this = GST_TCP_CLIENT_SRC (gobject);

  g_free (this->host);

  G_OBJECT_CLASS (parent_class)->finalize (gobject);

}

static GstCaps *

gst_tcp_client_src_getcaps (GstBaseSrc * bsrc)

{

  GstTCPClientSrc *src;

  GstCaps *caps = NULL;

  src = GST_TCP_CLIENT_SRC (bsrc);

  if (!GST_OBJECT_FLAG_IS_SET (src, GST_TCP_CLIENT_SRC_OPEN))

    caps = gst_caps_new_any ();

  else if (src->caps)

    caps = gst_caps_copy (src->caps);

  else

    caps = gst_caps_new_any ();

  GST_DEBUG_OBJECT (src, "returning caps %" GST_PTR_FORMAT, caps);

  g_assert (GST_IS_CAPS (caps));

  return caps;

}

static GstFlowReturn

gst_tcp_client_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)

{

  GstTCPClientSrc *src;

  GstFlowReturn ret = GST_FLOW_OK;

  src = GST_TCP_CLIENT_SRC (psrc);

  if (!GST_OBJECT_FLAG_IS_SET (src, GST_TCP_CLIENT_SRC_OPEN))

    goto wrong_state;

  GST_LOG_OBJECT (src, "asked for a buffer");

  /* read the buffer header if we're using a protocol */

  switch (src->protocol) {

    case GST_TCP_PROTOCOL_NONE:

      ret = gst_tcp_read_buffer (GST_ELEMENT (src), src->sock_fd.fd,

          src->fdset, outbuf);

      break;

    case GST_TCP_PROTOCOL_GDP:

      /* get the caps if we're using GDP */

      if (!src->caps_received) {

        GstCaps *caps;

        GST_DEBUG_OBJECT (src, "getting caps through GDP");

        ret = gst_tcp_gdp_read_caps (GST_ELEMENT (src), src->sock_fd.fd,

            src->fdset, &caps);

        if (ret != GST_FLOW_OK)

          goto no_caps;

        src->caps_received = TRUE;

        src->caps = caps;

      }

      ret = gst_tcp_gdp_read_buffer (GST_ELEMENT (src), src->sock_fd.fd,

          src->fdset, outbuf);

      break;

    default:

      /* need to assert as buf == NULL */

      g_assert ("Unhandled protocol type");

      break;

  }

  if (ret == GST_FLOW_OK) {

    GST_LOG_OBJECT (src,

        "Returning buffer from _get of size %d, ts %"

        GST_TIME_FORMAT ", dur %" GST_TIME_FORMAT

        ", offset %" G_GINT64_FORMAT ", offset_end %" G_GINT64_FORMAT,

        GST_BUFFER_SIZE (*outbuf),

        GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (*outbuf)),

        GST_TIME_ARGS (GST_BUFFER_DURATION (*outbuf)),

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

    gst_buffer_set_caps (*outbuf, src->caps);

  }

  return ret;

wrong_state:

  {

    GST_DEBUG_OBJECT (src, "connection to closed, cannot read data");

    return GST_FLOW_WRONG_STATE;

  }

no_caps:

  {

    GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),

        ("Could not read caps through GDP"));

    return ret;

  }

}

static void

gst_tcp_client_src_set_property (GObject * object, guint prop_id,

    const GValue * value, GParamSpec * pspec)

{

  GstTCPClientSrc *tcpclientsrc = GST_TCP_CLIENT_SRC (object);

  switch (prop_id) {

    case PROP_HOST:

      if (!g_value_get_string (value)) {

        g_warning ("host property cannot be NULL");

        break;

      }

      g_free (tcpclientsrc->host);

      tcpclientsrc->host = g_strdup (g_value_get_string (value));

      break;

    case PROP_PORT:

      tcpclientsrc->port = g_value_get_int (value);

      break;

    case PROP_PROTOCOL:

      tcpclientsrc->protocol = g_value_get_enum (value);

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

  }

}

static void

gst_tcp_client_src_get_property (GObject * object, guint prop_id,

    GValue * value, GParamSpec * pspec)

{

  GstTCPClientSrc *tcpclientsrc = GST_TCP_CLIENT_SRC (object);

  switch (prop_id) {

    case PROP_HOST:

      g_value_set_string (value, tcpclientsrc->host);

      break;

    case PROP_PORT:

      g_value_set_int (value, tcpclientsrc->port);

      break;

    case PROP_PROTOCOL:

      g_value_set_enum (value, tcpclientsrc->protocol);

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

  }

}

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

static gboolean

gst_tcp_client_src_start (GstBaseSrc * bsrc)

{

  int ret;

  gchar *ip;

  GstTCPClientSrc *src = GST_TCP_CLIENT_SRC (bsrc);

  if ((src->fdset = gst_poll_new (TRUE)) == NULL)

    goto socket_pair;

  /* create receiving client socket */

  GST_DEBUG_OBJECT (src, "opening receiving client socket to %s:%d",

      src->host, src->port);

  if ((src->sock_fd.fd = socket (AF_INET, SOCK_STREAM, 0)) == -1)

    goto no_socket;

  GST_DEBUG_OBJECT (src, "opened receiving client socket with fd %d",

      src->sock_fd.fd);

  GST_OBJECT_FLAG_SET (src, GST_TCP_CLIENT_SRC_OPEN);

  /* look up name if we need to */

  if (!(ip = gst_tcp_host_to_ip (GST_ELEMENT (src), src->host)))

    goto name_resolv;

  GST_DEBUG_OBJECT (src, "IP address for host %s is %s", src->host, ip);

  /* connect to server */

  memset (&src->server_sin, 0, sizeof (src->server_sin));

  src->server_sin.sin_family = AF_INET; /* network socket */

  src->server_sin.sin_port = htons (src->port); /* on port */

  src->server_sin.sin_addr.s_addr = inet_addr (ip);     /* on host ip */

  g_free (ip);

  GST_DEBUG_OBJECT (src, "connecting to server");

  ret = connect (src->sock_fd.fd, (struct sockaddr *) &src->server_sin,

      sizeof (src->server_sin));

  return TRUE;

socket_pair:

  {

    GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ_WRITE, (NULL),

        GST_ERROR_SYSTEM);

    return FALSE;

  }

no_socket:

  {

    GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL), GST_ERROR_SYSTEM);

    return FALSE;

  }

name_resolv:

  {

    gst_tcp_client_src_stop (GST_BASE_SRC (src));

    return FALSE;

  }

}

/* close the socket and associated resources

 * unset OPEN flag

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

static gboolean

gst_tcp_client_src_stop (GstBaseSrc * bsrc)

{

  GstTCPClientSrc *src;

  src = GST_TCP_CLIENT_SRC (bsrc);

  GST_DEBUG_OBJECT (src, "closing socket");

  if (src->fdset != NULL) {

    gst_poll_free (src->fdset);

    src->fdset = NULL;

  }

  gst_tcp_socket_close (&src->sock_fd);

  src->caps_received = FALSE;

  if (src->caps) {

    gst_caps_unref (src->caps);

    src->caps = NULL;

  }

  GST_OBJECT_FLAG_UNSET (src, GST_TCP_CLIENT_SRC_OPEN);

  return TRUE;

}

/* will be called only between calls to start() and stop() */

static gboolean

gst_tcp_client_src_unlock (GstBaseSrc * bsrc)

{

  GstTCPClientSrc *src = GST_TCP_CLIENT_SRC (bsrc);

  gst_poll_set_flushing (src->fdset, TRUE);

  return TRUE;

}