/*
 * GStreamer
 * Copyright (C) 2010 Jan Schmidt <thaytan@noraisin.net>
 *
 * 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., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

/**
 * SECTION:element-rtmpsink
 * @title: rtmpsink
 *
 * This element delivers data to a streaming server via RTMP. It uses
 * librtmp, and supports any protocols/urls that librtmp supports.
 * The URL/location can contain extra connection or session parameters
 * for librtmp, such as 'flashver=version'. See the librtmp documentation
 * for more detail
 *
 * ## Example launch line
 * |[
 * gst-launch-1.0 -v videotestsrc ! ffenc_flv ! flvmux ! rtmpsink location='rtmp://localhost/path/to/stream live=1'
 * ]| Encode a test video stream to FLV video format and stream it via RTMP.
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gst/gst.h>

#include "gstrtmpsink.h"

#ifdef G_OS_WIN32
#include <winsock2.h>
#endif

#include <stdlib.h>

GST_DEBUG_CATEGORY_STATIC (gst_rtmp_sink_debug);
#define GST_CAT_DEFAULT gst_rtmp_sink_debug

#define DEFAULT_LOCATION NULL

enum
{
  PROP_0,
  PROP_LOCATION
};

static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("video/x-flv")
    );

static void gst_rtmp_sink_uri_handler_init (gpointer g_iface,
    gpointer iface_data);
static void gst_rtmp_sink_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);
static void gst_rtmp_sink_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);
static void gst_rtmp_sink_finalize (GObject * object);
static gboolean gst_rtmp_sink_stop (GstBaseSink * sink);
static gboolean gst_rtmp_sink_start (GstBaseSink * sink);
static gboolean gst_rtmp_sink_event (GstBaseSink * sink, GstEvent * event);
static gboolean gst_rtmp_sink_setcaps (GstBaseSink * sink, GstCaps * caps);
static GstFlowReturn gst_rtmp_sink_render (GstBaseSink * sink, GstBuffer * buf);

#define gst_rtmp_sink_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstRTMPSink, gst_rtmp_sink, GST_TYPE_BASE_SINK,
    G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER,
        gst_rtmp_sink_uri_handler_init));

/* initialize the plugin's class */
static void
gst_rtmp_sink_class_init (GstRTMPSinkClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
  GstBaseSinkClass *gstbasesink_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
  gstbasesink_class = (GstBaseSinkClass *) klass;

  gobject_class->finalize = gst_rtmp_sink_finalize;
  gobject_class->set_property = gst_rtmp_sink_set_property;
  gobject_class->get_property = gst_rtmp_sink_get_property;

  g_object_class_install_property (gobject_class, PROP_LOCATION,
      g_param_spec_string ("location", "RTMP Location", "RTMP url",
          DEFAULT_LOCATION, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  gst_element_class_set_static_metadata (gstelement_class,
      "RTMP output sink",
      "Sink/Network", "Sends FLV content to a server via RTMP",
      "Jan Schmidt <thaytan@noraisin.net>");

  gst_element_class_add_static_pad_template (gstelement_class, &sink_template);

  gstbasesink_class->start = GST_DEBUG_FUNCPTR (gst_rtmp_sink_start);
  gstbasesink_class->stop = GST_DEBUG_FUNCPTR (gst_rtmp_sink_stop);
  gstbasesink_class->render = GST_DEBUG_FUNCPTR (gst_rtmp_sink_render);
  gstbasesink_class->set_caps = GST_DEBUG_FUNCPTR (gst_rtmp_sink_setcaps);
  gstbasesink_class->event = GST_DEBUG_FUNCPTR (gst_rtmp_sink_event);

  GST_DEBUG_CATEGORY_INIT (gst_rtmp_sink_debug, "rtmpsink", 0,
      "RTMP server element");
}

/* initialize the new element
 * initialize instance structure
 */
static void
gst_rtmp_sink_init (GstRTMPSink * sink)
{
#ifdef G_OS_WIN32
  WSADATA wsa_data;

  if (WSAStartup (MAKEWORD (2, 2), &wsa_data) != 0) {
    GST_ERROR_OBJECT (sink, "WSAStartup failed: 0x%08x", WSAGetLastError ());
  }
#endif
}

static void
gst_rtmp_sink_finalize (GObject * object)
{
  GstRTMPSink *sink = GST_RTMP_SINK (object);

#ifdef G_OS_WIN32
  WSACleanup ();
#endif
  g_free (sink->uri);

  G_OBJECT_CLASS (parent_class)->finalize (object);
}


static gboolean
gst_rtmp_sink_start (GstBaseSink * basesink)
{
  GstRTMPSink *sink = GST_RTMP_SINK (basesink);

  if (!sink->uri) {
    GST_ELEMENT_ERROR (sink, RESOURCE, OPEN_WRITE,
        ("Please set URI for RTMP output"), ("No URI set before starting"));
    return FALSE;
  }

  sink->rtmp_uri = g_strdup (sink->uri);
  sink->rtmp = RTMP_Alloc ();

  if (!sink->rtmp) {
    GST_ERROR_OBJECT (sink, "Could not allocate librtmp's RTMP context");
    goto error;
  }

  RTMP_Init (sink->rtmp);
  if (!RTMP_SetupURL (sink->rtmp, sink->rtmp_uri)) {
    GST_ELEMENT_ERROR (sink, RESOURCE, OPEN_WRITE, (NULL),
        ("Failed to setup URL '%s'", sink->uri));
    goto error;
  }

  GST_DEBUG_OBJECT (sink, "Created RTMP object");

  /* Mark this as an output connection */
  RTMP_EnableWrite (sink->rtmp);

  sink->first = TRUE;
  sink->have_write_error = FALSE;

  return TRUE;

error:
  if (sink->rtmp) {
    RTMP_Free (sink->rtmp);
    sink->rtmp = NULL;
  }
  g_free (sink->rtmp_uri);
  sink->rtmp_uri = NULL;
  return FALSE;
}

static gboolean
gst_rtmp_sink_stop (GstBaseSink * basesink)
{
  GstRTMPSink *sink = GST_RTMP_SINK (basesink);

  if (sink->header) {
    gst_buffer_unref (sink->header);
    sink->header = NULL;
  }
  if (sink->rtmp) {
    RTMP_Close (sink->rtmp);
    RTMP_Free (sink->rtmp);
    sink->rtmp = NULL;
  }
  if (sink->rtmp_uri) {
    g_free (sink->rtmp_uri);
    sink->rtmp_uri = NULL;
  }

  return TRUE;
}

static GstFlowReturn
gst_rtmp_sink_render (GstBaseSink * bsink, GstBuffer * buf)
{
  GstRTMPSink *sink = GST_RTMP_SINK (bsink);
  gboolean need_unref = FALSE;
  GstMapInfo map = GST_MAP_INFO_INIT;

  if (sink->rtmp == NULL) {
    /* Do not crash */
    GST_ELEMENT_ERROR (sink, RESOURCE, WRITE, (NULL), ("Failed to write data"));
    return GST_FLOW_ERROR;
  }

  /* Ignore buffers that are in the stream headers (caps) */
  if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_HEADER)) {
    return GST_FLOW_OK;
  }

  if (sink->first) {
    /* open the connection */
    if (!RTMP_IsConnected (sink->rtmp)) {
      if (!RTMP_Connect (sink->rtmp, NULL)
          || !RTMP_ConnectStream (sink->rtmp, 0)) {
        GST_ELEMENT_ERROR (sink, RESOURCE, OPEN_WRITE, (NULL),
            ("Could not connect to RTMP stream \"%s\" for writing", sink->uri));
        RTMP_Free (sink->rtmp);
        sink->rtmp = NULL;
        g_free (sink->rtmp_uri);
        sink->rtmp_uri = NULL;
        sink->have_write_error = TRUE;
        return GST_FLOW_ERROR;
      }
      GST_DEBUG_OBJECT (sink, "Opened connection to %s", sink->rtmp_uri);
    }

    /* Prepend the header from the caps to the first non header buffer */
    if (sink->header) {
      buf = gst_buffer_append (gst_buffer_ref (sink->header),
          gst_buffer_ref (buf));
      need_unref = TRUE;
    }

    sink->first = FALSE;
  }

  if (sink->have_write_error)
    goto write_failed;

  GST_LOG_OBJECT (sink, "Sending %" G_GSIZE_FORMAT " bytes to RTMP server",
      gst_buffer_get_size (buf));

  gst_buffer_map (buf, &map, GST_MAP_READ);

  if (RTMP_Write (sink->rtmp, (char *) map.data, map.size) <= 0)
    goto write_failed;

  gst_buffer_unmap (buf, &map);
  if (need_unref)
    gst_buffer_unref (buf);

  return GST_FLOW_OK;

  /* ERRORS */
write_failed:
  {
    GST_ELEMENT_ERROR (sink, RESOURCE, WRITE, (NULL), ("Failed to write data"));
    gst_buffer_unmap (buf, &map);
    if (need_unref)
      gst_buffer_unref (buf);
    sink->have_write_error = TRUE;
    return GST_FLOW_ERROR;
  }
}

/*
 * URI interface support.
 */
static GstURIType
gst_rtmp_sink_uri_get_type (GType type)
{
  return GST_URI_SINK;
}

static const gchar *const *
gst_rtmp_sink_uri_get_protocols (GType type)
{
  static const gchar *protocols[] =
      { "rtmp", "rtmpt", "rtmps", "rtmpe", "rtmfp", "rtmpte", "rtmpts", NULL };

  return protocols;
}

static gchar *
gst_rtmp_sink_uri_get_uri (GstURIHandler * handler)
{
  GstRTMPSink *sink = GST_RTMP_SINK (handler);

  /* FIXME: make thread-safe */
  return g_strdup (sink->uri);
}

static gboolean
gst_rtmp_sink_uri_set_uri (GstURIHandler * handler, const gchar * uri,
    GError ** error)
{
  GstRTMPSink *sink = GST_RTMP_SINK (handler);
  gboolean ret = TRUE;

  if (GST_STATE (sink) >= GST_STATE_PAUSED) {
    g_set_error (error, GST_URI_ERROR, GST_URI_ERROR_BAD_STATE,
        "Changing the URI on rtmpsink when it is running is not supported");
    return FALSE;
  }

  g_free (sink->uri);
  sink->uri = NULL;

  if (uri != NULL) {
    int protocol;
    AVal host;
    unsigned int port;
    AVal playpath, app;

    if (!RTMP_ParseURL (uri, &protocol, &host, &port, &playpath, &app) ||
        !host.av_len) {
      GST_ELEMENT_ERROR (sink, RESOURCE, OPEN_WRITE,
          ("Failed to parse URI %s", uri), (NULL));
      g_set_error (error, GST_URI_ERROR, GST_URI_ERROR_BAD_URI,
          "Could not parse RTMP URI");
      ret = FALSE;
    } else {
      sink->uri = g_strdup (uri);
    }

    if (playpath.av_val)
      free (playpath.av_val);
  }

  if (ret) {
    sink->have_write_error = FALSE;
    GST_DEBUG_OBJECT (sink, "Changed URI to %s", GST_STR_NULL (uri));
  }

  return ret;
}

static void
gst_rtmp_sink_uri_handler_init (gpointer g_iface, gpointer iface_data)
{
  GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;

  iface->get_type = gst_rtmp_sink_uri_get_type;
  iface->get_protocols = gst_rtmp_sink_uri_get_protocols;
  iface->get_uri = gst_rtmp_sink_uri_get_uri;
  iface->set_uri = gst_rtmp_sink_uri_set_uri;
}

static void
gst_rtmp_sink_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstRTMPSink *sink = GST_RTMP_SINK (object);

  switch (prop_id) {
    case PROP_LOCATION:
      gst_rtmp_sink_uri_set_uri (GST_URI_HANDLER (sink),
          g_value_get_string (value), NULL);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static gboolean
gst_rtmp_sink_setcaps (GstBaseSink * sink, GstCaps * caps)
{
  GstRTMPSink *rtmpsink = GST_RTMP_SINK (sink);
  GstStructure *s;
  const GValue *sh;

  GST_DEBUG_OBJECT (sink, "caps set to %" GST_PTR_FORMAT, caps);

  /* Clear our current header buffer */
  if (rtmpsink->header) {
    gst_buffer_unref (rtmpsink->header);
    rtmpsink->header = NULL;
  }

  s = gst_caps_get_structure (caps, 0);

  sh = gst_structure_get_value (s, "streamheader");
  if (sh == NULL)
    goto out;

  if (GST_VALUE_HOLDS_BUFFER (sh)) {
    rtmpsink->header = gst_buffer_ref (gst_value_get_buffer (sh));
  } else if (GST_VALUE_HOLDS_ARRAY (sh)) {
    GArray *buffers;
    gint i;

    buffers = g_value_peek_pointer (sh);

    /* Concatenate all buffers in streamheader into one */
    rtmpsink->header = gst_buffer_new ();
    for (i = 0; i < buffers->len; ++i) {
      GValue *val;
      GstBuffer *buf;

      val = &g_array_index (buffers, GValue, i);
      buf = g_value_peek_pointer (val);

      gst_buffer_ref (buf);

      rtmpsink->header = gst_buffer_append (rtmpsink->header, buf);
    }
  } else {
    GST_ERROR_OBJECT (rtmpsink, "streamheader field has unexpected type %s",
        G_VALUE_TYPE_NAME (sh));
  }

  GST_DEBUG_OBJECT (rtmpsink, "have %" G_GSIZE_FORMAT " bytes of header data",
      gst_buffer_get_size (rtmpsink->header));

out:

  return TRUE;
}

static gboolean
gst_rtmp_sink_event (GstBaseSink * sink, GstEvent * event)
{
  GstRTMPSink *rtmpsink = GST_RTMP_SINK (sink);

  switch (event->type) {
    case GST_EVENT_FLUSH_STOP:
      rtmpsink->have_write_error = FALSE;
      break;
    default:
      break;
  }

  return GST_BASE_SINK_CLASS (parent_class)->event (sink, event);
}

static void
gst_rtmp_sink_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec)
{
  GstRTMPSink *sink = GST_RTMP_SINK (object);

  switch (prop_id) {
    case PROP_LOCATION:
      g_value_set_string (value, sink->uri);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}