/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wtay@chello.be>
 *
 * gststatistics.c: 
 *
 * 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.
 */


#include <gststatistics.h>


GstElementDetails gst_statistics_details = {
  "Statistics",
  "Generic",
  "LGPL",
  "Statistics on buffers/bytes/events",
  VERSION,
  "David I. Lehn <dlehn@users.sourceforge.net>",
  "(C) 2001",
};


/* Statistics signals and args */
enum {
  SIGNAL_UPDATE,
  LAST_SIGNAL
};

enum {
  ARG_0,
  ARG_BUFFERS,
  ARG_BYTES,
  ARG_EVENTS,
  ARG_BUFFER_UPDATE_FREQ,
  ARG_BYTES_UPDATE_FREQ,
  ARG_EVENT_UPDATE_FREQ,
  ARG_UPDATE_ON_EOS,
  ARG_UPDATE,
  ARG_SILENT,
};


static void gst_statistics_class_init	(GstStatisticsClass *klass);
static void gst_statistics_init		(GstStatistics *statistics);

static void gst_statistics_set_property	(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void gst_statistics_get_property	(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);

static void gst_statistics_chain		(GstPad *pad, GstBuffer *buf);
static void gst_statistics_reset		(GstStatistics *statistics);
static void gst_statistics_print		(GstStatistics *statistics);

static GstElementClass *parent_class = NULL;
static guint gst_statistics_signals[LAST_SIGNAL] = { 0, };

static stats zero_stats = { 0, };

GType
gst_statistics_get_type (void) 
{
  static GType statistics_type = 0;

  if (!statistics_type) {
    static const GTypeInfo statistics_info = {
      sizeof(GstStatisticsClass),      NULL,
      NULL,
      (GClassInitFunc)gst_statistics_class_init,
      NULL,
      NULL,
      sizeof(GstStatistics),
      0,
      (GInstanceInitFunc)gst_statistics_init,
    };
    statistics_type = g_type_register_static (GST_TYPE_ELEMENT, "GstStatistics", &statistics_info, 0);
  }
  return statistics_type;
}

static void 
gst_statistics_class_init (GstStatisticsClass *klass) 
{
  GObjectClass *gobject_class;

  gobject_class = (GObjectClass*)klass;

  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);

  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BUFFERS,
    g_param_spec_int64 ("buffers", "buffers", "total buffers count",
                          0, G_MAXINT64, 0, G_PARAM_READABLE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BYTES,
    g_param_spec_int64 ("bytes", "bytes", "total bytes count",
                          0, G_MAXINT64, 0, G_PARAM_READABLE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_EVENTS,
    g_param_spec_int64 ("events", "events", "total event count",
                          0, G_MAXINT64, 0, G_PARAM_READABLE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BUFFER_UPDATE_FREQ,
    g_param_spec_int64 ("buffer_update_freq", "buffer update freq", "buffer update frequency",
                          0, G_MAXINT64, 0, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BYTES_UPDATE_FREQ,
    g_param_spec_int64 ("bytes_update_freq", "bytes update freq", "bytes update frequency",
                          0, G_MAXINT64, 0, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_EVENT_UPDATE_FREQ,
    g_param_spec_int64 ("event_update_freq", "event update freq", "event update frequency",
                          0, G_MAXINT64, 0, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_UPDATE_ON_EOS,
    g_param_spec_boolean ("update_on_eos", "update on EOS", "update on EOS event",
                          TRUE,G_PARAM_READWRITE)); 
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_UPDATE,
    g_param_spec_boolean ("update", "update", "update",
                          TRUE,G_PARAM_READWRITE)); 
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SILENT,
    g_param_spec_boolean ("silent", "silent", "silent",
                          TRUE,G_PARAM_READWRITE)); 

  gst_statistics_signals[SIGNAL_UPDATE] =
    g_signal_new ("update", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
                   G_STRUCT_OFFSET (GstStatisticsClass, update), NULL, NULL,
                   g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);

  gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_statistics_set_property);
  gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_statistics_get_property);
}

static GstBufferPool*
gst_statistics_get_bufferpool (GstPad *pad)
{
  GstStatistics *statistics;

  statistics = GST_STATISTICS (gst_pad_get_parent (pad));

  return gst_pad_get_bufferpool (statistics->srcpad);
}

static void 
gst_statistics_init (GstStatistics *statistics) 
{
  statistics->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
  gst_element_add_pad (GST_ELEMENT (statistics), statistics->sinkpad);
  gst_pad_set_chain_function (statistics->sinkpad, GST_DEBUG_FUNCPTR (gst_statistics_chain));
  gst_pad_set_bufferpool_function (statistics->sinkpad, GST_DEBUG_FUNCPTR (gst_statistics_get_bufferpool));
  
  statistics->srcpad = gst_pad_new ("src", GST_PAD_SRC);
  gst_element_add_pad (GST_ELEMENT (statistics), statistics->srcpad);

  statistics->timer = NULL;
  statistics->last_timer = NULL;
  gst_statistics_reset(statistics);
}

static void
gst_statistics_reset (GstStatistics *statistics)
{
  g_return_if_fail (statistics != NULL);
  g_return_if_fail (GST_IS_STATISTICS (statistics));

  statistics->stats.buffers = 0;
  statistics->stats.bytes = 0;
  statistics->stats.events = 0;

  statistics->last_stats.buffers = 0;
  statistics->last_stats.bytes = 0;
  statistics->last_stats.events = 0;

  statistics->update_count.buffers = 0;
  statistics->update_count.bytes = 0;
  statistics->update_count.events = 0;

  statistics->update_freq.buffers = 0;
  statistics->update_freq.bytes = 0;
  statistics->update_freq.events = 0;

  statistics->update_on_eos = TRUE;
  statistics->update = TRUE;
  statistics->silent = FALSE;

  if (!statistics->timer) {
    statistics->timer = g_timer_new();
  }
  if (!statistics->last_timer) {
    statistics->last_timer = g_timer_new();
  }
}

static void
print_stats(gboolean first, const gchar *name, const gchar *type, stats *base, stats *final, double time)
{
  const gchar *header0 = "statistics";
  const gchar *headerN = "          ";
  stats delta;

  delta.buffers = final->buffers - base->buffers;
  delta.bytes = final->bytes - base->bytes;
  delta.events = final->events - base->events;

  g_print("%s: (%s) %s: s:%g buffers:%" G_GINT64_FORMAT 
	  " bytes:%" G_GINT64_FORMAT
	  " events:%" G_GINT64_FORMAT "\n",
    first ? header0 : headerN,
    name, type, time,
    final->buffers,
    final->bytes,
    final->events);
  g_print("%s: (%s) %s: buf/s:%g B/s:%g e/s:%g B/buf:%g\n",
    headerN,
    name, type,
    delta.buffers/time,
    delta.bytes/time,
    delta.events/time,
    ((double)delta.bytes/(double)delta.buffers));
}

static void
gst_statistics_print (GstStatistics *statistics)
{
  const gchar *name;
  double elapsed;
  double last_elapsed;

  g_return_if_fail (statistics != NULL);
  g_return_if_fail (GST_IS_STATISTICS (statistics));

  name = gst_object_get_name(GST_OBJECT(statistics));
  if (!name) {
    name = "";
  }

  elapsed = g_timer_elapsed(statistics->timer, NULL);
  last_elapsed = g_timer_elapsed(statistics->last_timer, NULL);

  print_stats(1, name, "total", &zero_stats, &statistics->stats, elapsed);
  print_stats(0, name, "last", &statistics->last_stats, &statistics->stats, last_elapsed);
  statistics->last_stats = statistics->stats;
  g_timer_reset(statistics->last_timer);
}

static void 
gst_statistics_chain (GstPad *pad, GstBuffer *buf) 
{
  GstStatistics *statistics;
  gboolean update = FALSE;

  g_return_if_fail (pad != NULL);
  g_return_if_fail (GST_IS_PAD (pad));
  g_return_if_fail (buf != NULL);

  statistics = GST_STATISTICS (gst_pad_get_parent (pad));

  if (GST_IS_EVENT(buf)) {
    GstEvent *event = GST_EVENT (buf);
    statistics->stats.events += 1;
    if (GST_EVENT_TYPE(event) == GST_EVENT_EOS) {
      gst_element_set_eos (GST_ELEMENT (statistics));
      if (statistics->update_on_eos) {
        update = TRUE;
      }
    }
    if (statistics->update_freq.events) {
      statistics->update_count.events += 1;
      if (statistics->update_count.events == statistics->update_freq.events) {
        statistics->update_count.events = 0;
        update = TRUE;
      }
    }
  } else {
    statistics->stats.buffers += 1;
    if (statistics->update_freq.buffers) {
      statistics->update_count.buffers += 1;
      if (statistics->update_count.buffers == statistics->update_freq.buffers) {
        statistics->update_count.buffers = 0;
        update = TRUE;
      }
    }

    statistics->stats.bytes += GST_BUFFER_SIZE(buf);
    if (statistics->update_freq.bytes) {
      statistics->update_count.bytes += GST_BUFFER_SIZE(buf);
      if (statistics->update_count.bytes >= statistics->update_freq.bytes) {
        statistics->update_count.bytes = 0;
        update = TRUE;
      }
    }
  }

  if (update) {
    if (statistics->update) {
      GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, statistics, "pre update emit\n");
      g_signal_emit (G_OBJECT (statistics), gst_statistics_signals[SIGNAL_UPDATE], 0);
      GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, statistics, "post update emit\n");
    }
    if (!statistics->silent) {
      gst_statistics_print(statistics);
    }
  }
  gst_pad_push (statistics->srcpad, buf);
}

static void 
gst_statistics_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) 
{
  GstStatistics *statistics;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail (GST_IS_STATISTICS (object));
  
  statistics = GST_STATISTICS (object);

  switch (prop_id) {
    case ARG_BUFFER_UPDATE_FREQ:
      statistics->update_freq.buffers = g_value_get_int64 (value);
      break;
    case ARG_BYTES_UPDATE_FREQ:
      statistics->update_freq.bytes = g_value_get_int64 (value);
      break;
    case ARG_EVENT_UPDATE_FREQ:
      statistics->update_freq.events = g_value_get_int64 (value);
      break;
    case ARG_UPDATE_ON_EOS:
      statistics->update_on_eos = g_value_get_boolean (value);
      break;
    case ARG_UPDATE:
      statistics->update = g_value_get_boolean (value);
      break;
    case ARG_SILENT:
      statistics->silent = g_value_get_boolean (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void gst_statistics_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) {
  GstStatistics *statistics;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail (GST_IS_STATISTICS (object));
  
  statistics = GST_STATISTICS (object);

  switch (prop_id) {
    case ARG_BUFFERS:
      g_value_set_int64 (value, statistics->stats.buffers);
      break;
    case ARG_BYTES:
      g_value_set_int64 (value, statistics->stats.bytes);
      break;
    case ARG_EVENTS:
      g_value_set_int64 (value, statistics->stats.events);
      break;
    case ARG_BUFFER_UPDATE_FREQ:
      g_value_set_int64 (value, statistics->update_freq.buffers);
      break;
    case ARG_BYTES_UPDATE_FREQ:
      g_value_set_int64 (value, statistics->update_freq.bytes);
      break;
    case ARG_EVENT_UPDATE_FREQ:
      g_value_set_int64 (value, statistics->update_freq.events);
      break;
    case ARG_UPDATE_ON_EOS:
      g_value_set_boolean (value, statistics->update_on_eos);
      break;
    case ARG_UPDATE:
      g_value_set_boolean (value, statistics->update);
      break;
    case ARG_SILENT:
      g_value_set_boolean (value, statistics->silent);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}
