gstqueue2.c 52.8 KB
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/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2003 Colin Walters <cwalters@gnome.org>
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 *                    2000,2005,2007 Wim Taymans <wim@fluendo.com>
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 *                    2007 Thiago Sousa Santos <thiagoss@lcc.ufcg.edu.br>
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 *
 * gstqueue2.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.
 */

/**
 * SECTION:element-queue2
 * @short_description: Asynchronous data queue.
 *
 * Data is queued until one of the limits specified by the
 * #GstQueue:max-size-buffers, #GstQueue:max-size-bytes and/or
 * #GstQueue:max-size-time properties has been reached. Any attempt to push
 * more buffers into the queue will block the pushing thread until more space
 * becomes available.
 *
 * The queue will create a new thread on the source pad to decouple the
 * processing on sink and source pad.
 *
 * You can query how many buffers are queued by reading the
 * #GstQueue:current-level-buffers property.
 *
 * The default queue size limits are 100 buffers, 2MB of data, or
 * two seconds worth of data, whichever is reached first.
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 *
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 * If you set temp-location, the element will buffer data on the file
 * specified by it. By using this, it will buffer the entire 
 * stream data on the file independently of the queue size limits, they
 * will only be used for buffering statistics.
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 *
 */
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
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#include <glib/gstdio.h>

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

static const GstElementDetails gst_queue_details = GST_ELEMENT_DETAILS ("Queue",
    "Generic",
    "Simple data queue",
    "Erik Walthinsen <omega@cse.ogi.edu>, " "Wim Taymans <wim@fluendo.com>");

static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS_ANY);

static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS_ANY);

GST_DEBUG_CATEGORY_STATIC (queue_debug);
#define GST_CAT_DEFAULT (queue_debug)
GST_DEBUG_CATEGORY_STATIC (queue_dataflow);

enum
{
  LAST_SIGNAL
};

/* default property values */
#define DEFAULT_MAX_SIZE_BUFFERS   100  /* 100 buffers */
#define DEFAULT_MAX_SIZE_BYTES     (2 * 1024 * 1024)    /* 2 MB */
#define DEFAULT_MAX_SIZE_TIME      2 * GST_SECOND       /* 2 seconds */
#define DEFAULT_USE_BUFFERING      FALSE
#define DEFAULT_USE_RATE_ESTIMATE  TRUE
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#define DEFAULT_LOW_PERCENT        10
#define DEFAULT_HIGH_PERCENT       99
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/* other defines */
#define DEFAULT_BUFFER_SIZE 4096
#define QUEUE_IS_USING_TEMP_FILE(queue) (queue->temp_location != NULL)

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enum
{
  PROP_0,
  PROP_CUR_LEVEL_BUFFERS,
  PROP_CUR_LEVEL_BYTES,
  PROP_CUR_LEVEL_TIME,
  PROP_MAX_SIZE_BUFFERS,
  PROP_MAX_SIZE_BYTES,
  PROP_MAX_SIZE_TIME,
  PROP_USE_BUFFERING,
  PROP_USE_RATE_ESTIMATE,
  PROP_LOW_PERCENT,
  PROP_HIGH_PERCENT,
  PROP_TEMP_LOCATION
};

#define GST_TYPE_QUEUE \
  (gst_queue_get_type())
#define GST_QUEUE(obj) \
  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_QUEUE,GstQueue))
#define GST_QUEUE_CLASS(klass) \
  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_QUEUE,GstQueueClass))
#define GST_IS_QUEUE(obj) \
  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_QUEUE))
#define GST_IS_QUEUE_CLASS(klass) \
  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_QUEUE))
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#define GST_QUEUE_CAST(obj) \
  ((GstQueue *)(obj))
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typedef struct _GstQueue GstQueue;
typedef struct _GstQueueSize GstQueueSize;
typedef struct _GstQueueClass GstQueueClass;

/* used to keep track of sizes (current and max) */
struct _GstQueueSize
{
  guint buffers;
  guint bytes;
  guint64 time;
  guint64 rate_time;
};

#define GST_QUEUE_CLEAR_LEVEL(l) G_STMT_START {         \
  l.buffers = 0;                                        \
  l.bytes = 0;                                          \
  l.time = 0;                                           \
  l.rate_time = 0;                                      \
} G_STMT_END

struct _GstQueue
{
  GstElement element;

  /*< private > */
  GstPad *sinkpad;
  GstPad *srcpad;

  /* segments to keep track of timestamps */
  GstSegment sink_segment;
  GstSegment src_segment;

  /* flowreturn when srcpad is paused */
  GstFlowReturn srcresult;
  gboolean is_eos;

  /* the queue of data we're keeping our hands on */
  GQueue *queue;

  GstQueueSize cur_level;       /* currently in the queue */
  GstQueueSize max_level;       /* max. amount of data allowed in the queue */
  gboolean use_buffering;
  gboolean use_rate_estimate;
  gint low_percent;             /* low/high watermarks for buffering */
  gint high_percent;

  /* current buffering state */
  gboolean is_buffering;

  /* for measuring input/output rates */
  guint64 bytes_in;
  guint64 bytes_out;
  GTimer *timer;
  gdouble byte_in_rate;
  gdouble byte_out_rate;
  gdouble last_elapsed;
  gboolean timer_started;

  GMutex *qlock;                /* lock for queue (vs object lock) */
  gboolean waiting_add;
  GCond *item_add;              /* signals buffers now available for reading */
  gboolean waiting_del;
  GCond *item_del;              /* signals space now available for writing */

  /* temp location stuff */
  gchar *temp_location;
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  FILE *temp_file;
  guint64 writing_pos;
  guint64 reading_pos;
  /* we need this to send the first new segment event of the stream
   * because we can't save it on the file */
  gboolean segment_event_received;
  GstEvent *starting_segment;
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};

struct _GstQueueClass
{
  GstElementClass parent_class;
};

#define STATUS(queue, pad, msg) \
  GST_CAT_LOG_OBJECT (queue_dataflow, queue, \
                      "(%s:%s) " msg ": %u of %u buffers, %u of %u " \
                      "bytes, %" G_GUINT64_FORMAT " of %" G_GUINT64_FORMAT \
                      " ns, %u items", \
                      GST_DEBUG_PAD_NAME (pad), \
                      queue->cur_level.buffers, \
                      queue->max_level.buffers, \
                      queue->cur_level.bytes, \
                      queue->max_level.bytes, \
                      queue->cur_level.time, \
                      queue->max_level.time, \
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                      QUEUE_IS_USING_TEMP_FILE(queue) ? \
                        queue->writing_pos - queue->reading_pos : \
                        queue->queue->length)
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#define GST_QUEUE_MUTEX_LOCK(q) G_STMT_START {                          \
  g_mutex_lock (q->qlock);                                              \
} G_STMT_END

#define GST_QUEUE_MUTEX_LOCK_CHECK(q,label) G_STMT_START {              \
  GST_QUEUE_MUTEX_LOCK (q);                                             \
  if (q->srcresult != GST_FLOW_OK)                                      \
    goto label;                                                         \
} G_STMT_END

#define GST_QUEUE_MUTEX_UNLOCK(q) G_STMT_START {                        \
  g_mutex_unlock (q->qlock);                                            \
} G_STMT_END

#define GST_QUEUE_WAIT_DEL_CHECK(q, label) G_STMT_START {               \
  STATUS (queue, q->sinkpad, "wait for DEL");                           \
  q->waiting_del = TRUE;                                                \
  g_cond_wait (q->item_del, queue->qlock);                              \
  q->waiting_del = FALSE;                                               \
  if (q->srcresult != GST_FLOW_OK) {                                    \
    STATUS (queue, q->srcpad, "received DEL wakeup");                   \
    goto label;                                                         \
  }                                                                     \
  STATUS (queue, q->sinkpad, "received DEL");                           \
} G_STMT_END

#define GST_QUEUE_WAIT_ADD_CHECK(q, label) G_STMT_START {               \
  STATUS (queue, q->srcpad, "wait for ADD");                            \
  q->waiting_add = TRUE;                                                \
  g_cond_wait (q->item_add, q->qlock);                                  \
  q->waiting_add = FALSE;                                               \
  if (q->srcresult != GST_FLOW_OK) {                                    \
    STATUS (queue, q->srcpad, "received ADD wakeup");                   \
    goto label;                                                         \
  }                                                                     \
  STATUS (queue, q->srcpad, "received ADD");                            \
} G_STMT_END

#define GST_QUEUE_SIGNAL_DEL(q) G_STMT_START {                          \
  if (q->waiting_del) {                                                 \
    STATUS (q, q->srcpad, "signal DEL");                                \
    g_cond_signal (q->item_del);                                        \
  }                                                                     \
} G_STMT_END

#define GST_QUEUE_SIGNAL_ADD(q) G_STMT_START {                          \
  if (q->waiting_add) {                                                 \
    STATUS (q, q->sinkpad, "signal ADD");                               \
    g_cond_signal (q->item_add);                                        \
  }                                                                     \
} G_STMT_END

#define _do_init(bla) \

/* can't use boilerplate as we need to register with Queue2 to avoid conflicts
 * with queue in core elements */
static void gst_queue_class_init (GstQueueClass * klass);
static void gst_queue_init (GstQueue * queue, GstQueueClass * g_class);
static GstElementClass *parent_class;

static GType
gst_queue_get_type (void)
{
  static GType gst_queue_type = 0;

  if (!gst_queue_type) {
    static const GTypeInfo gst_queue_info = {
      sizeof (GstQueueClass),
      NULL,
      NULL,
      (GClassInitFunc) gst_queue_class_init,
      NULL,
      NULL,
      sizeof (GstQueue),
      0,
      (GInstanceInitFunc) gst_queue_init,
      NULL
    };

    gst_queue_type =
        g_type_register_static (GST_TYPE_ELEMENT, "GstQueue2",
        &gst_queue_info, 0);
  }
  return gst_queue_type;
}

static void gst_queue_finalize (GObject * object);

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

static GstFlowReturn gst_queue_chain (GstPad * pad, GstBuffer * buffer);
static GstFlowReturn gst_queue_bufferalloc (GstPad * pad, guint64 offset,
    guint size, GstCaps * caps, GstBuffer ** buf);
static gboolean gst_queue_acceptcaps (GstPad * pad, GstCaps * caps);
static gboolean gst_queue_push_one (GstQueue * queue);
static void gst_queue_loop (GstPad * pad);

static gboolean gst_queue_handle_sink_event (GstPad * pad, GstEvent * event);

static gboolean gst_queue_handle_src_event (GstPad * pad, GstEvent * event);
static gboolean gst_queue_handle_src_query (GstPad * pad, GstQuery * query);

static GstCaps *gst_queue_getcaps (GstPad * pad);

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static GstFlowReturn gst_queue_get_range (GstPad * pad, guint64 offset,
    guint length, GstBuffer ** buffer);
static gboolean gst_queue_src_checkgetrange_function (GstPad * pad);

static gboolean gst_queue_src_activate_pull (GstPad * pad, gboolean active);
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static gboolean gst_queue_src_activate_push (GstPad * pad, gboolean active);
static gboolean gst_queue_sink_activate_push (GstPad * pad, gboolean active);
static GstStateChangeReturn gst_queue_change_state (GstElement * element,
    GstStateChange transition);

static gboolean gst_queue_is_empty (GstQueue * queue);
static gboolean gst_queue_is_filled (GstQueue * queue);

/* static guint gst_queue_signals[LAST_SIGNAL] = { 0 }; */

static void
gst_queue_class_init (GstQueueClass * klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);

  parent_class = g_type_class_peek_parent (klass);

  gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_queue_set_property);
  gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_queue_get_property);

  /* properties */
  g_object_class_install_property (gobject_class, PROP_CUR_LEVEL_BYTES,
      g_param_spec_uint ("current-level-bytes", "Current level (kB)",
          "Current amount of data in the queue (bytes)",
          0, G_MAXUINT, 0, G_PARAM_READABLE));
  g_object_class_install_property (gobject_class, PROP_CUR_LEVEL_BUFFERS,
      g_param_spec_uint ("current-level-buffers", "Current level (buffers)",
          "Current number of buffers in the queue",
          0, G_MAXUINT, 0, G_PARAM_READABLE));
  g_object_class_install_property (gobject_class, PROP_CUR_LEVEL_TIME,
      g_param_spec_uint64 ("current-level-time", "Current level (ns)",
          "Current amount of data in the queue (in ns)",
          0, G_MAXUINT64, 0, G_PARAM_READABLE));

  g_object_class_install_property (gobject_class, PROP_MAX_SIZE_BYTES,
      g_param_spec_uint ("max-size-bytes", "Max. size (kB)",
          "Max. amount of data in the queue (bytes, 0=disable)",
          0, G_MAXUINT, DEFAULT_MAX_SIZE_BYTES, G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class, PROP_MAX_SIZE_BUFFERS,
      g_param_spec_uint ("max-size-buffers", "Max. size (buffers)",
          "Max. number of buffers in the queue (0=disable)",
          0, G_MAXUINT, DEFAULT_MAX_SIZE_BUFFERS, G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class, PROP_MAX_SIZE_TIME,
      g_param_spec_uint64 ("max-size-time", "Max. size (ns)",
          "Max. amount of data in the queue (in ns, 0=disable)",
          0, G_MAXUINT64, DEFAULT_MAX_SIZE_TIME, G_PARAM_READWRITE));

  g_object_class_install_property (gobject_class, PROP_USE_BUFFERING,
      g_param_spec_boolean ("use-buffering", "Use buffering",
          "Emit GST_MESSAGE_BUFFERING based on low-/high-percent thresholds",
          DEFAULT_USE_BUFFERING, G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class, PROP_USE_RATE_ESTIMATE,
      g_param_spec_boolean ("use-rate-estimate", "Use Rate Estimate",
          "Estimate the bitrate of the stream to calculate time level",
          DEFAULT_USE_RATE_ESTIMATE, G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class, PROP_LOW_PERCENT,
      g_param_spec_int ("low-percent", "Low percent",
          "Low threshold for buffering to start",
          0, 100, DEFAULT_LOW_PERCENT, G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class, PROP_HIGH_PERCENT,
      g_param_spec_int ("high-percent", "High percent",
          "High threshold for buffering to finish",
          0, 100, DEFAULT_HIGH_PERCENT, G_PARAM_READWRITE));

  g_object_class_install_property (gobject_class, PROP_TEMP_LOCATION,
      g_param_spec_string ("temp-location", "Temporary File Location",
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          "Location of a temporary file to store data in",
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          NULL, G_PARAM_READWRITE));

  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&srctemplate));
  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&sinktemplate));

  gst_element_class_set_details (gstelement_class, &gst_queue_details);

  /* set several parent class virtual functions */
  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_queue_finalize);

  gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_queue_change_state);
}

static void
gst_queue_init (GstQueue * queue, GstQueueClass * g_class)
{
  queue->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");

  gst_pad_set_chain_function (queue->sinkpad,
      GST_DEBUG_FUNCPTR (gst_queue_chain));
  gst_pad_set_activatepush_function (queue->sinkpad,
      GST_DEBUG_FUNCPTR (gst_queue_sink_activate_push));
  gst_pad_set_event_function (queue->sinkpad,
      GST_DEBUG_FUNCPTR (gst_queue_handle_sink_event));
  gst_pad_set_getcaps_function (queue->sinkpad,
      GST_DEBUG_FUNCPTR (gst_queue_getcaps));
  gst_pad_set_bufferalloc_function (queue->sinkpad,
      GST_DEBUG_FUNCPTR (gst_queue_bufferalloc));
  gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad);

  queue->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");

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  gst_pad_set_activatepull_function (queue->srcpad,
      GST_DEBUG_FUNCPTR (gst_queue_src_activate_pull));
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  gst_pad_set_activatepush_function (queue->srcpad,
      GST_DEBUG_FUNCPTR (gst_queue_src_activate_push));
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  gst_pad_set_getrange_function (queue->srcpad,
      GST_DEBUG_FUNCPTR (gst_queue_get_range));
  gst_pad_set_checkgetrange_function (queue->srcpad,
      GST_DEBUG_FUNCPTR (gst_queue_src_checkgetrange_function));
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  gst_pad_set_acceptcaps_function (queue->srcpad,
      GST_DEBUG_FUNCPTR (gst_queue_acceptcaps));
  gst_pad_set_getcaps_function (queue->srcpad,
      GST_DEBUG_FUNCPTR (gst_queue_getcaps));
  gst_pad_set_event_function (queue->srcpad,
      GST_DEBUG_FUNCPTR (gst_queue_handle_src_event));
  gst_pad_set_query_function (queue->srcpad,
      GST_DEBUG_FUNCPTR (gst_queue_handle_src_query));
  gst_element_add_pad (GST_ELEMENT (queue), queue->srcpad);

  /* levels */
  GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
  queue->max_level.buffers = DEFAULT_MAX_SIZE_BUFFERS;
  queue->max_level.bytes = DEFAULT_MAX_SIZE_BYTES;
  queue->max_level.time = DEFAULT_MAX_SIZE_TIME;
  queue->max_level.rate_time = DEFAULT_MAX_SIZE_TIME;
  queue->use_buffering = DEFAULT_USE_BUFFERING;
  queue->use_rate_estimate = DEFAULT_USE_RATE_ESTIMATE;
  queue->low_percent = DEFAULT_LOW_PERCENT;
  queue->high_percent = DEFAULT_HIGH_PERCENT;

  gst_segment_init (&queue->sink_segment, GST_FORMAT_TIME);
  gst_segment_init (&queue->src_segment, GST_FORMAT_TIME);

  queue->srcresult = GST_FLOW_WRONG_STATE;
  queue->is_eos = FALSE;
  queue->timer = g_timer_new ();

  queue->qlock = g_mutex_new ();
  queue->waiting_add = FALSE;
  queue->item_add = g_cond_new ();
  queue->waiting_del = FALSE;
  queue->item_del = g_cond_new ();
  queue->queue = g_queue_new ();

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  /* tempfile related */
  queue->temp_location = NULL;
  queue->temp_file = NULL;

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  GST_DEBUG_OBJECT (queue,
      "initialized queue's not_empty & not_full conditions");
}

/* called only once, as opposed to dispose */
static void
gst_queue_finalize (GObject * object)
{
  GstQueue *queue = GST_QUEUE (object);

  GST_DEBUG_OBJECT (queue, "finalizing queue");

  while (!g_queue_is_empty (queue->queue)) {
    GstMiniObject *data = g_queue_pop_head (queue->queue);

    gst_mini_object_unref (data);
  }
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  g_queue_free (queue->queue);
  g_mutex_free (queue->qlock);
  g_cond_free (queue->item_add);
  g_cond_free (queue->item_del);
  g_timer_destroy (queue->timer);

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  /* temp_file path cleanup  */
  if (queue->temp_location != NULL)
    g_free (queue->temp_location);

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

static GstCaps *
gst_queue_getcaps (GstPad * pad)
{
  GstQueue *queue;
  GstPad *otherpad;
  GstCaps *result;

  queue = GST_QUEUE (GST_PAD_PARENT (pad));

  otherpad = (pad == queue->srcpad ? queue->sinkpad : queue->srcpad);
  result = gst_pad_peer_get_caps (otherpad);
  if (result == NULL)
    result = gst_caps_new_any ();

  return result;
}

static GstFlowReturn
gst_queue_bufferalloc (GstPad * pad, guint64 offset, guint size, GstCaps * caps,
    GstBuffer ** buf)
{
  GstQueue *queue;
  GstFlowReturn result;

  queue = GST_QUEUE (GST_PAD_PARENT (pad));

  /* Forward to src pad, without setting caps on the src pad */
  result = gst_pad_alloc_buffer (queue->srcpad, offset, size, caps, buf);

  return result;
}

static gboolean
gst_queue_acceptcaps (GstPad * pad, GstCaps * caps)
{
  /* The only time our acceptcaps method should be called is on the srcpad
   * when we push a buffer, in which case we always accepted those caps */
  return TRUE;
}

/* calculate the diff between running time on the sink and src of the queue.
 * This is the total amount of time in the queue. */
static void
update_time_level (GstQueue * queue)
{
  gint64 sink_time, src_time;

  sink_time =
      gst_segment_to_running_time (&queue->sink_segment, GST_FORMAT_TIME,
      queue->sink_segment.last_stop);

  src_time = gst_segment_to_running_time (&queue->src_segment, GST_FORMAT_TIME,
      queue->src_segment.last_stop);

  GST_DEBUG_OBJECT (queue, "sink %" GST_TIME_FORMAT ", src %" GST_TIME_FORMAT,
      GST_TIME_ARGS (sink_time), GST_TIME_ARGS (src_time));

  if (sink_time >= src_time)
    queue->cur_level.time = sink_time - src_time;
  else
    queue->cur_level.time = 0;
}

/* take a NEWSEGMENT event and apply the values to segment, updating the time
 * level of queue. */
static void
apply_segment (GstQueue * queue, GstEvent * event, GstSegment * segment)
{
  gboolean update;
  GstFormat format;
  gdouble rate, arate;
  gint64 start, stop, time;

  gst_event_parse_new_segment_full (event, &update, &rate, &arate,
      &format, &start, &stop, &time);

  /* now configure the values, we use these to track timestamps on the
   * sinkpad. */
  if (format != GST_FORMAT_TIME) {
    /* non-time format, pretent the current time segment is closed with a
     * 0 start and unknown stop time. */
    update = FALSE;
    format = GST_FORMAT_TIME;
    start = 0;
    stop = -1;
    time = 0;
  }
  gst_segment_set_newsegment_full (segment, update,
      rate, arate, format, start, stop, time);

  GST_DEBUG_OBJECT (queue,
      "configured NEWSEGMENT %" GST_SEGMENT_FORMAT, segment);

  /* segment can update the time level of the queue */
  update_time_level (queue);
}

/* take a buffer and update segment, updating the time level of the queue. */
static void
apply_buffer (GstQueue * queue, GstBuffer * buffer, GstSegment * segment)
{
  GstClockTime duration, timestamp;

  timestamp = GST_BUFFER_TIMESTAMP (buffer);
  duration = GST_BUFFER_DURATION (buffer);

  /* if no timestamp is set, assume it's continuous with the previous 
   * time */
  if (timestamp == GST_CLOCK_TIME_NONE)
    timestamp = segment->last_stop;

  /* add duration */
  if (duration != GST_CLOCK_TIME_NONE)
    timestamp += duration;

  GST_DEBUG_OBJECT (queue, "last_stop updated to %" GST_TIME_FORMAT,
      GST_TIME_ARGS (timestamp));

  gst_segment_set_last_stop (segment, GST_FORMAT_TIME, timestamp);

  /* calc diff with other end */
  update_time_level (queue);
}

static void
update_buffering (GstQueue * queue)
{
  gint percent;
  gboolean post = FALSE;

  if (!queue->use_buffering)
    return;

#define GET_PERCENT(format) ((queue->max_level.format) > 0 ? \
		(queue->cur_level.format) * 100 / (queue->max_level.format) : 0)

  if (queue->is_eos) {
    /* on EOS we are always 100% full, we set the var here so that it we can
     * resue the logic below to stop buffering */
    percent = 100;
  } else {
    /* figure out the percent we are filled, we take the max of all formats. */
    percent = GET_PERCENT (bytes);
    percent = MAX (percent, GET_PERCENT (time));
    percent = MAX (percent, GET_PERCENT (buffers));
    if (queue->use_rate_estimate)
      percent = MAX (percent, GET_PERCENT (rate_time));
  }

  if (queue->is_buffering) {
    post = TRUE;
    /* if we were buffering see if we reached the high watermark */
    if (percent >= queue->high_percent)
      queue->is_buffering = FALSE;
  } else {
    /* we were not buffering, check if we need to start buffering if we drop
     * below the low threshold */
    if (percent < queue->low_percent) {
      queue->is_buffering = TRUE;
      post = TRUE;
    }
  }
  if (post) {
    /* scale to high percent so that it becomes the 100% mark */
    percent = percent * 100 / queue->high_percent;
    /* clip */
    if (percent > 100)
      percent = 100;

    GST_DEBUG_OBJECT (queue, "buffering %d percent", percent);
    gst_element_post_message (GST_ELEMENT_CAST (queue),
        gst_message_new_buffering (GST_OBJECT_CAST (queue), percent));
  } else {
    GST_DEBUG_OBJECT (queue, "filled %d percent", percent);
  }

#undef GET_PERCENT
}

static void
reset_rate_timer (GstQueue * queue)
{
  queue->bytes_in = 0;
  queue->bytes_out = 0;
  queue->byte_in_rate = 0.0;
  queue->byte_out_rate = 0.0;
  queue->last_elapsed = 0.0;
  queue->timer_started = FALSE;
}

/* Tuning for rate estimation. We use a large window for the input rate because
 * it should be stable when connected to a network. The output rate is less
 * stable (the elements preroll, queues behind a demuxer fill, ...) and should
 * therefore adapt more quickly. */
#define RATE_INTERVAL    0.5
#define AVG_IN(avg,val)  ((avg) * 15.0 + (val)) / 16.0
#define AVG_OUT(avg,val) ((avg) * 3.0 + (val)) / 4.0

static void
update_rates (GstQueue * queue)
{
  gdouble elapsed, period;
  gdouble byte_in_rate;
  gdouble byte_out_rate;

  if (!queue->timer_started) {
    queue->timer_started = TRUE;
    g_timer_start (queue->timer);
    return;
  }

  elapsed = g_timer_elapsed (queue->timer, NULL);

  /* recalc after each interval. */
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  if (queue->last_elapsed + RATE_INTERVAL < elapsed) {
    period = elapsed - queue->last_elapsed;

    GST_DEBUG_OBJECT (queue,
        "rates: period %f, in %" G_GUINT64_FORMAT ", out %" G_GUINT64_FORMAT,
        period, queue->bytes_in, queue->bytes_out);

    byte_in_rate = queue->bytes_in / period;
    byte_out_rate = queue->bytes_out / period;

    if (queue->byte_in_rate == 0.0)
      queue->byte_in_rate = byte_in_rate;
    else
      queue->byte_in_rate = AVG_IN (queue->byte_in_rate, byte_in_rate);

    if (queue->byte_out_rate == 0.0)
      queue->byte_out_rate = byte_out_rate;
    else
      queue->byte_out_rate = AVG_OUT (queue->byte_out_rate, byte_out_rate);

    /* reset the values to calculate rate over the next interval */
    queue->last_elapsed = elapsed;
    queue->bytes_in = 0;
    queue->bytes_out = 0;
  }
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  if (queue->byte_in_rate > 0.0) {
    queue->cur_level.rate_time =
        queue->cur_level.bytes / queue->byte_in_rate * GST_SECOND;
  }
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  GST_DEBUG_OBJECT (queue, "rates: in %f, out %f, time %" GST_TIME_FORMAT,
      queue->byte_in_rate, queue->byte_out_rate,
      GST_TIME_ARGS (queue->cur_level.rate_time));
}

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static void
gst_queue_write_buffer_to_file (GstQueue * queue, GstBuffer * buffer)
{
  guint size;
  guint8 *data;

  fseek (queue->temp_file, queue->writing_pos, SEEK_SET);

  data = GST_BUFFER_DATA (buffer);
  size = GST_BUFFER_SIZE (buffer);

  fwrite (data, 1, size, queue->temp_file);
  queue->writing_pos += size;
}

/* see if there is enough data in the file to read a full buffer */
static gboolean
gst_queue_have_data (GstQueue * queue, guint64 offset, guint length)
{
  GST_DEBUG_OBJECT (queue,
      "offset %" G_GUINT64_FORMAT ", len %u, write %" G_GUINT64_FORMAT, offset,
      length, queue->writing_pos);
  if (queue->is_eos)
    return TRUE;

  if (offset + length < queue->writing_pos)
    return TRUE;

  return FALSE;
}

static GstFlowReturn
gst_queue_create_read (GstQueue * queue, guint64 offset, guint length,
    GstBuffer ** buffer)
{
  size_t res;
  GstBuffer *buf;

  /* check if we have enough data at @offset. If there is not enough data, we
   * block and wait. */
  while (!gst_queue_have_data (queue, offset, length)) {
    GST_QUEUE_WAIT_ADD_CHECK (queue, out_flushing);
  }

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#ifdef HAVE_FSEEKO
  if (fseeko (queue->temp_file, (off_t) offset, SEEK_SET) != 0)
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    goto seek_failed;
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#elif defined (G_OS_UNIX)
  if (lseek (fileno (queue->temp_file), (off_t) offset,
          SEEK_SET) == (off_t) - 1)
    goto seek_failed;
#else
  if (fseek (queue->temp_file, (long) offset, SEEK_SET) != 0)
    goto seek_failed;
#endif
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  buf = gst_buffer_new_and_alloc (length);

  /* this should not block */
  GST_LOG_OBJECT (queue, "Reading %d bytes", length);
  res = fread (GST_BUFFER_DATA (buf), 1, length, queue->temp_file);
  GST_LOG_OBJECT (queue, "read %d bytes", res);

  if (G_UNLIKELY (res == 0)) {
    /* check for errors or EOF */
    if (ferror (queue->temp_file))
      goto could_not_read;
    if (feof (queue->temp_file) && length > 0)
      goto eos;
  }

  length = res;

  GST_BUFFER_SIZE (buf) = length;
  GST_BUFFER_OFFSET (buf) = offset;
  GST_BUFFER_OFFSET_END (buf) = offset + length;

  *buffer = buf;

  queue->reading_pos = offset + length;

  return GST_FLOW_OK;

  /* ERRORS */
out_flushing:
  {
    GST_DEBUG_OBJECT (queue, "we are flushing");
    return GST_FLOW_WRONG_STATE;
  }
seek_failed:
  {
    GST_ELEMENT_ERROR (queue, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
    return GST_FLOW_ERROR;
  }
could_not_read:
  {
    GST_ELEMENT_ERROR (queue, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
    gst_buffer_unref (buf);
    return GST_FLOW_ERROR;
  }
eos:
  {
    GST_DEBUG ("non-regular file hits EOS");
    gst_buffer_unref (buf);
    return GST_FLOW_UNEXPECTED;
  }
}

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/* should be called with QUEUE_LOCK */
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static GstMiniObject *
gst_queue_read_item_from_file (GstQueue * queue)
{
  GstMiniObject *item;

  if (queue->starting_segment != NULL) {
    item = GST_MINI_OBJECT_CAST (queue->starting_segment);
    queue->starting_segment = NULL;
  } else {
    GstFlowReturn ret;
    GstBuffer *buffer;

    ret =
        gst_queue_create_read (queue, queue->reading_pos, DEFAULT_BUFFER_SIZE,
        &buffer);
    switch (ret) {
      case GST_FLOW_OK:
        item = GST_MINI_OBJECT_CAST (buffer);
        break;
      case GST_FLOW_UNEXPECTED:
        item = GST_MINI_OBJECT_CAST (gst_event_new_eos ());
        break;
      default:
        item = NULL;
        break;
    }
  }
  return item;
}

static gboolean
gst_queue_open_temp_location_file (GstQueue * queue)
{
  /* nothing to do */
  if (queue->temp_location == NULL)
    goto no_filename;

  /* open the file for update/writing */
  queue->temp_file = g_fopen (queue->temp_location, "wb+");
  /* error creating file */
  if (queue->temp_file == NULL)
    goto open_failed;

  queue->writing_pos = 0;
  queue->reading_pos = 0;

  return TRUE;

  /* ERRORS */
no_filename:
  {
    GST_ELEMENT_ERROR (queue, RESOURCE, NOT_FOUND,
        (_("No file name specified.")), (NULL));
    return FALSE;
  }
open_failed:
  {
    GST_ELEMENT_ERROR (queue, RESOURCE, OPEN_READ,
        (_("Could not open file \"%s\" for reading."), queue->temp_location),
        GST_ERROR_SYSTEM);
    return FALSE;
  }
}

static void
gst_queue_close_temp_location_file (GstQueue * queue)
{
  /* nothing to do */
  if (queue->temp_file == NULL)
    return;

  /* we don't remove the file so that the application can use it as a cache
   * later on */
  fflush (queue->temp_file);
  fclose (queue->temp_file);
  remove (queue->temp_location);
  queue->temp_file = NULL;
}

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static void
gst_queue_locked_flush (GstQueue * queue)
{
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  if (QUEUE_IS_USING_TEMP_FILE (queue)) {
    gst_queue_close_temp_location_file (queue);
    gst_queue_open_temp_location_file (queue);
  } else {
    while (!g_queue_is_empty (queue->queue)) {
      GstMiniObject *data = g_queue_pop_head (queue->queue);
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      /* Then lose another reference because we are supposed to destroy that
         data when flushing */
      gst_mini_object_unref (data);
    }
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  }
  GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
  gst_segment_init (&queue->sink_segment, GST_FORMAT_TIME);
  gst_segment_init (&queue->src_segment, GST_FORMAT_TIME);
  queue->is_eos = FALSE;
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  if (queue->starting_segment != NULL)
    gst_event_unref (queue->starting_segment);
  queue->starting_segment = NULL;
  queue->segment_event_received = FALSE;
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  /* we deleted a lot of something */
  GST_QUEUE_SIGNAL_DEL (queue);
}

/* enqueue an item an update the level stats */
static void
gst_queue_locked_enqueue (GstQueue * queue, gpointer item)
{
  if (GST_IS_BUFFER (item)) {
    GstBuffer *buffer;
    guint size;

    buffer = GST_BUFFER_CAST (item);
    size = GST_BUFFER_SIZE (buffer);

    /* add buffer to the statistics */
    queue->cur_level.buffers++;
    queue->cur_level.bytes += size;
    queue->bytes_in += size;
    /* apply new buffer to segment stats */
    apply_buffer (queue, buffer, &queue->sink_segment);
    /* update the byterate stats */
    update_rates (queue);
    /* update the buffering status */
    update_buffering (queue);

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    if (QUEUE_IS_USING_TEMP_FILE (queue)) {
      gst_queue_write_buffer_to_file (queue, buffer);
    }

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  } else if (GST_IS_EVENT (item)) {
    GstEvent *event;

    event = GST_EVENT_CAST (item);

    switch (GST_EVENT_TYPE (event)) {
      case GST_EVENT_EOS:
        /* Zero the thresholds, this makes sure the queue is completely
         * filled and we can read all data from the queue. */
        queue->is_eos = TRUE;
        break;
      case GST_EVENT_NEWSEGMENT:
        apply_segment (queue, event, &queue->sink_segment);
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        /* This is our first new segment, we hold it
         * as we can't save it on the temp file */
        if (QUEUE_IS_USING_TEMP_FILE (queue)) {
          if (queue->segment_event_received)
            goto unexpected_event;

          queue->segment_event_received = TRUE;
          queue->starting_segment = event;
        }
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        break;
      default:
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        if (QUEUE_IS_USING_TEMP_FILE (queue))
          goto unexpected_event;
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        break;
    }
  } else {
    g_warning ("Unexpected item %p added in queue %s (refcounting problem?)",
        item, GST_OBJECT_NAME (queue));
    /* we can't really unref since we don't know what it is */
    item = NULL;
  }

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  if (!QUEUE_IS_USING_TEMP_FILE (queue) && item)
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    g_queue_push_tail (queue->queue, item);
  GST_QUEUE_SIGNAL_ADD (queue);
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  return;

  /* ERRORS */
unexpected_event:
  {
    g_warning
        ("Unexpected event of kind %s can't be added in temp file of queue %s ",
        gst_event_type_get_name (GST_EVENT_TYPE (item)),
        GST_OBJECT_NAME (queue));
    gst_event_unref (GST_EVENT_CAST (item));
    return;
  }
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}

/* dequeue an item from the queue and update level stats */
static GstMiniObject *
gst_queue_locked_dequeue (GstQueue * queue)
{
  GstMiniObject *item;

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  if (QUEUE_IS_USING_TEMP_FILE (queue))
    item = gst_queue_read_item_from_file (queue);
  else
    item = g_queue_pop_head (queue->queue);

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  if (item == NULL)
    goto no_item;

  if (GST_IS_BUFFER (item)) {
    GstBuffer *buffer;
    guint size;

    buffer = GST_BUFFER_CAST (item);
    size = GST_BUFFER_SIZE (buffer);

    GST_CAT_LOG_OBJECT (queue_dataflow, queue,
        "retrieved buffer %p from queue", buffer);

    queue->cur_level.buffers--;
    queue->cur_level.bytes -= size;
    queue->bytes_out += size;
    apply_buffer (queue, buffer, &queue->src_segment);
    /* update the byterate stats */
    update_rates (queue);
    /* update the buffering */
    update_buffering (queue);

  } else if (GST_IS_EVENT (item)) {
    GstEvent *event = GST_EVENT_CAST (item);

    GST_CAT_LOG_OBJECT (queue_dataflow, queue,
        "retrieved event %p from queue", event);

    switch (GST_EVENT_TYPE (event)) {
      case GST_EVENT_EOS:
        /* queue is empty now that we dequeued the EOS */
        GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
        break;
      case GST_EVENT_NEWSEGMENT:
        apply_segment (queue, event, &queue->src_segment);
        break;
      default:
        break;
    }
  } else {
    g_warning
        ("Unexpected item %p dequeued from queue %s (refcounting problem?)",
        item, GST_OBJECT_NAME (queue));
    item = NULL;
  }
  GST_QUEUE_SIGNAL_DEL (queue);

  return item;

  /* ERRORS */
no_item:
  {
    GST_CAT_LOG_OBJECT (queue_dataflow, queue, "the queue is empty");
    return NULL;
  }
}

static gboolean
gst_queue_handle_sink_event (GstPad * pad, GstEvent * event)
{
  GstQueue *queue;

  queue = GST_QUEUE (GST_OBJECT_PARENT (pad));

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_FLUSH_START:
    {
      GST_CAT_LOG_OBJECT (queue_dataflow, queue, "received flush start event");
      /* forward event */
      gst_pad_push_event (queue->srcpad, event);

      /* now unblock the chain function */
      GST_QUEUE_MUTEX_LOCK (queue);
      queue->srcresult = GST_FLOW_WRONG_STATE;
      /* unblock the loop and chain functions */
      g_cond_signal (queue->item_add);
      g_cond_signal (queue->item_del);
      GST_QUEUE_MUTEX_UNLOCK (queue);

      /* make sure it pauses, this should happen since we sent
       * flush_start downstream. */
      gst_pad_pause_task (queue->srcpad);
      GST_CAT_LOG_OBJECT (queue_dataflow, queue, "loop stopped");
      goto done;
    }
    case GST_EVENT_FLUSH_STOP:
    {
      GST_CAT_LOG_OBJECT (queue_dataflow, queue, "received flush stop event");
      /* forward event */
      gst_pad_push_event (queue->srcpad, event);

      GST_QUEUE_MUTEX_LOCK (queue);
      gst_queue_locked_flush (queue);
      queue->srcresult = GST_FLOW_OK;
      /* reset rate counters */
      reset_rate_timer (queue);
      gst_pad_start_task (queue->srcpad, (GstTaskFunction) gst_queue_loop,
          queue->srcpad);
      GST_QUEUE_MUTEX_UNLOCK (queue);
      goto done;
    }
    default:
      if (GST_EVENT_IS_SERIALIZED (event)) {
        /* serialized events go in the queue */
        GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
        gst_queue_locked_enqueue (queue, event);
        GST_QUEUE_MUTEX_UNLOCK (queue);
      } else {
        /* non-serialized events are passed upstream. */
        gst_pad_push_event (queue->srcpad, event);
      }
      break;
  }
done:
  return TRUE;

  /* ERRORS */
out_flushing:
  {
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    GST_DEBUG_OBJECT (queue, "we are flushing");
    GST_QUEUE_MUTEX_UNLOCK (queue);

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    gst_buffer_unref (event);
    return FALSE;
  }
}

static gboolean
gst_queue_is_empty (GstQueue * queue)
{
  /* never empty on EOS */
  if (queue->is_eos)
    return FALSE;

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  if (QUEUE_IS_USING_TEMP_FILE (queue)) {
    return queue->writing_pos == queue->reading_pos;
  } else {
    if (queue->queue->length == 0)
      return TRUE;
  }
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  return FALSE;
}

static gboolean
gst_queue_is_filled (GstQueue * queue)
{
  gboolean res;

  /* always filled on EOS */
  if (queue->is_eos)
    return TRUE;

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  /* if using file, we're never filled if we don't have EOS */
  if (QUEUE_IS_USING_TEMP_FILE (queue))
    return FALSE;

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#define CHECK_FILLED(format) ((queue->max_level.format) > 0 && \
		(queue->cur_level.format) >= (queue->max_level.format))

  /* we are filled if one of the current levels exceeds the max */
  res = CHECK_FILLED (buffers) || CHECK_FILLED (bytes) || CHECK_FILLED (time);

  /* if we need to, use the rate estimate to check against the max time we are
   * allowed to queue */
  if (queue->use_rate_estimate)
    res |= CHECK_FILLED (rate_time);

#undef CHECK_FILLED
  return res;
}

static GstFlowReturn
gst_queue_chain (GstPad * pad, GstBuffer * buffer)
{
  GstQueue *queue;

  queue = GST_QUEUE (GST_OBJECT_PARENT (pad));

  GST_CAT_LOG_OBJECT (queue_dataflow, queue,
      "received buffer %p of size %d, time %" GST_TIME_FORMAT ", duration %"
      GST_TIME_FORMAT, buffer, GST_BUFFER_SIZE (buffer),
      GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
      GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));

  /* we have to lock the queue since we span threads */
  GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);

  /* We make space available if we're "full" according to whatever
   * the user defined as "full". */
  while (gst_queue_is_filled (queue)) {
    GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
        "queue is full, waiting for free space");
    /* Wait for space to be available, we could be unlocked because of a flush. */
    GST_QUEUE_WAIT_DEL_CHECK (queue, out_flushing);
  }

  /* put buffer in queue now */
  gst_queue_locked_enqueue (queue, buffer);
  GST_QUEUE_MUTEX_UNLOCK (queue);

  return GST_FLOW_OK;

  /* special conditions */
out_flushing:
  {
    GstFlowReturn ret = queue->srcresult;

    GST_CAT_LOG_OBJECT (queue_dataflow, queue,
        "exit because task paused, reason: %s", gst_flow_get_name (ret));
    GST_QUEUE_MUTEX_UNLOCK (queue);
1282

1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338
    gst_buffer_unref (buffer);

    return ret;
  }
}

/* dequeue an item from the queue an push it downstream. This functions returns
 * the result of the push. */
static GstFlowReturn
gst_queue_push_one (GstQueue * queue)
{
  GstFlowReturn result = GST_FLOW_OK;
  GstMiniObject *data;

  data = gst_queue_locked_dequeue (queue);
  if (data == NULL)
    goto no_item;

  if (GST_IS_BUFFER (data)) {
    GstBuffer *buffer = GST_BUFFER_CAST (data);

    GST_QUEUE_MUTEX_UNLOCK (queue);

    result = gst_pad_push (queue->srcpad, buffer);

    /* need to check for srcresult here as well */
    GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
  } else if (GST_IS_EVENT (data)) {
    GstEvent *event = GST_EVENT_CAST (data);
    GstEventType type = GST_EVENT_TYPE (event);

    GST_QUEUE_MUTEX_UNLOCK (queue);

    gst_pad_push_event (queue->srcpad, event);

    GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
    /* if we're EOS, return UNEXPECTED so that the task pauses. */
    if (type == GST_EVENT_EOS)
      result = GST_FLOW_UNEXPECTED;
  }
  return result;

  /* ERRORS */
no_item:
  {
    GST_CAT_LOG_OBJECT (queue_dataflow, queue,
        "exit because we have no item in the queue");
    return GST_FLOW_ERROR;
  }
out_flushing:
  {
    GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because we are flushing");
    return GST_FLOW_WRONG_STATE;
  }
}

1339 1340
/* called repeadedly with @pad as the source pad. This function should push out
 * data to the peer element. */
1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441
static void
gst_queue_loop (GstPad * pad)
{
  GstQueue *queue;
  GstFlowReturn ret;

  queue = GST_QUEUE (GST_PAD_PARENT (pad));

  /* have to lock for thread-safety */
  GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);

  while (gst_queue_is_empty (queue)) {
    /* we recheck, we could be unlocked because of a flush. */
    GST_QUEUE_WAIT_ADD_CHECK (queue, out_flushing);
  }
  ret = gst_queue_push_one (queue);
  queue->srcresult = ret;
  if (ret != GST_FLOW_OK)
    goto out_flushing;

  GST_QUEUE_MUTEX_UNLOCK (queue);

  return;

  /* ERRORS */
out_flushing:
  {
    gst_pad_pause_task (queue->srcpad);
    GST_CAT_LOG_OBJECT (queue_dataflow, queue,
        "pause task, reason:  %s", gst_flow_get_name (queue->srcresult));
    GST_QUEUE_MUTEX_UNLOCK (queue);
    return;
  }
}

static gboolean
gst_queue_handle_src_event (GstPad * pad, GstEvent * event)
{
  gboolean res = TRUE;
  GstQueue *queue = GST_QUEUE (GST_PAD_PARENT (pad));

#ifndef GST_DISABLE_GST_DEBUG
  GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "got event %p (%s)",
      event, GST_EVENT_TYPE_NAME (event));
#endif

  /* just forward upstream */
  res = gst_pad_push_event (queue->sinkpad, event);

  return res;
}

static gboolean
gst_queue_handle_src_query (GstPad * pad, GstQuery * query)
{
  GstQueue *queue = GST_QUEUE (GST_PAD_PARENT (pad));
  GstPad *peer;
  gboolean res;

  if (!(peer = gst_pad_get_peer (queue->sinkpad)))
    return FALSE;

  res = gst_pad_query (peer, query);
  gst_object_unref (peer);
  if (!res)
    return FALSE;

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_POSITION:
    {
      gint64 peer_pos;
      GstFormat format;

      /* get peer position */
      gst_query_parse_position (query, &format, &peer_pos);

      /* FIXME: this code assumes that there's no discont in the queue */
      switch (format) {
        case GST_FORMAT_BYTES:
          peer_pos -= queue->cur_level.bytes;
          break;
        case GST_FORMAT_TIME:
          peer_pos -= queue->cur_level.time;
          break;
        default:
          GST_WARNING_OBJECT (queue, "dropping query in %s format, don't "
              "know how to adjust value", gst_format_get_name (format));
          return FALSE;
      }
      /* set updated position */
      gst_query_set_position (query, format, peer_pos);
      break;
    }
    default:
      /* peer handled other queries */
      break;
  }

  return TRUE;
}

1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486
static GstFlowReturn
gst_queue_get_range (GstPad * pad, guint64 offset, guint length,
    GstBuffer ** buffer)
{
  GstQueue *queue;
  GstFlowReturn ret;

  queue = GST_QUEUE_CAST (gst_pad_get_parent (pad));

  GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
  length = (length == -1) ? DEFAULT_BUFFER_SIZE : length;
  offset = (offset == -1) ? queue->reading_pos : offset;

  /* function will block when the range is not yet available */
  ret = gst_queue_create_read (queue, offset, length, buffer);
  GST_QUEUE_MUTEX_UNLOCK (queue);

  gst_object_unref (queue);

  return ret;

  /* ERRORS */
out_flushing:
  {
    GST_DEBUG_OBJECT (queue, "we are flushing");
    GST_QUEUE_MUTEX_UNLOCK (queue);
    return GST_FLOW_WRONG_STATE;
  }
}

static gboolean
gst_queue_src_checkgetrange_function (GstPad * pad)
{
  GstQueue *queue;
  gboolean ret;

  queue = GST_QUEUE (gst_pad_get_parent (pad));
  /* we can operate in pull mode when we are using a tempfile */
  ret = QUEUE_IS_USING_TEMP_FILE (queue);
  gst_object_unref (GST_OBJECT (queue));

  return ret;
}

/* sink currently only operates in push mode */
1487 1488 1489 1490 1491 1492 1493 1494 1495 1496
static gboolean
gst_queue_sink_activate_push (GstPad * pad, gboolean active)
{
  gboolean result = TRUE;
  GstQueue *queue;

  queue = GST_QUEUE (gst_pad_get_parent (pad));

  if (active) {
    GST_QUEUE_MUTEX_LOCK (queue);
1497
    GST_DEBUG_OBJECT (queue, "activating push mode");
1498 1499 1500 1501 1502 1503
    queue->srcresult = GST_FLOW_OK;
    reset_rate_timer (queue);
    GST_QUEUE_MUTEX_UNLOCK (queue);
  } else {
    /* unblock chain function */
    GST_QUEUE_MUTEX_LOCK (queue);
1504
    GST_DEBUG_OBJECT (queue, "deactivating push mode");
1505 1506 1507 1508 1509 1510 1511 1512 1513 1514
    queue->srcresult = GST_FLOW_WRONG_STATE;
    gst_queue_locked_flush (queue);
    GST_QUEUE_MUTEX_UNLOCK (queue);
  }

  gst_object_unref (queue);

  return result;
}

1515 1516
/* src operating in push mode, we start a task on the source pad that pushes out
 * buffers from the queue */
1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
static gboolean
gst_queue_src_activate_push (GstPad * pad, gboolean active)
{
  gboolean result = FALSE;
  GstQueue *queue;

  queue = GST_QUEUE (gst_pad_get_parent (pad));

  if (active) {
    GST_QUEUE_MUTEX_LOCK (queue);
1527
    GST_DEBUG_OBJECT (queue, "activating push mode");
1528 1529 1530 1531 1532 1533
    queue->srcresult = GST_FLOW_OK;
    result = gst_pad_start_task (pad, (GstTaskFunction) gst_queue_loop, pad);
    GST_QUEUE_MUTEX_UNLOCK (queue);
  } else {
    /* unblock loop function */
    GST_QUEUE_MUTEX_LOCK (queue);
1534
    GST_DEBUG_OBJECT (queue, "deactivating push mode");
1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548
    queue->srcresult = GST_FLOW_WRONG_STATE;
    /* the item add signal will unblock */
    g_cond_signal (queue->item_add);
    GST_QUEUE_MUTEX_UNLOCK (queue);

    /* step 2, make sure streaming finishes */
    result = gst_pad_stop_task (pad);
  }

  gst_object_unref (queue);

  return result;
}

1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587
/* pull mode, downstream will call our getrange function */
static gboolean
gst_queue_src_activate_pull (GstPad * pad, gboolean active)
{
  gboolean result;
  GstQueue *queue;

  queue = GST_QUEUE (gst_pad_get_parent (pad));

  if (active) {
    if (QUEUE_IS_USING_TEMP_FILE (queue)) {
      GST_QUEUE_MUTEX_LOCK (queue);
      GST_DEBUG_OBJECT (queue, "activating pull mode");
      queue->srcresult = GST_FLOW_OK;
      result = TRUE;
      GST_QUEUE_MUTEX_UNLOCK (queue);
    } else {
      GST_QUEUE_MUTEX_LOCK (queue);
      GST_DEBUG_OBJECT (queue, "no temp file, cannot activate pull mode");
      /* this is not allowed, we cannot operate in pull mode without a temp
       * file. */
      queue->srcresult = GST_FLOW_WRONG_STATE;
      result = FALSE;
      GST_QUEUE_MUTEX_UNLOCK (queue);
    }
  } else {
    GST_QUEUE_MUTEX_LOCK (queue);
    GST_DEBUG_OBJECT (queue, "deactivating pull mode");
    queue->srcresult = GST_FLOW_WRONG_STATE;
    /* this will unlock getrange */
    g_cond_signal (queue->item_add);
    result = TRUE;
    GST_QUEUE_MUTEX_UNLOCK (queue);
  }
  gst_object_unref (queue);

  return result;
}

1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599
static GstStateChangeReturn
gst_queue_change_state (GstElement * element, GstStateChange transition)
{
  GstQueue *queue;
  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;

  queue = GST_QUEUE (element);

  switch (transition) {
    case GST_STATE_CHANGE_NULL_TO_READY:
      break;
    case GST_STATE_CHANGE_READY_TO_PAUSED:
1600 1601 1602 1603 1604 1605
      if (QUEUE_IS_USING_TEMP_FILE (queue)) {
        if (!gst_queue_open_temp_location_file (queue))
          ret = GST_STATE_CHANGE_FAILURE;
      }
      queue->segment_event_received = FALSE;
      queue->starting_segment = NULL;
1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618
      break;
    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
      break;
    default:
      break;
  }

  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);

  switch (transition) {
    case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
      break;
    case GST_STATE_CHANGE_PAUSED_TO_READY:
1619 1620 1621 1622 1623 1624
      if (QUEUE_IS_USING_TEMP_FILE (queue))
        gst_queue_close_temp_location_file (queue);
      if (queue->starting_segment != NULL) {
        gst_event_unref (queue->starting_segment);
        queue->starting_segment = NULL;
      }
1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647
      break;
    case GST_STATE_CHANGE_READY_TO_NULL:
      break;
    default:
      break;
  }

  return ret;
}

/* changing the capacity of the queue must wake up
 * the _chain function, it might have more room now
 * to store the buffer/event in the queue */
#define QUEUE_CAPACITY_CHANGE(q)\
  g_cond_signal (queue->item_del);

/* Changing the minimum required fill level must
 * wake up the _loop function as it might now
 * be able to preceed.
 */
#define QUEUE_THRESHOLD_CHANGE(q)\
  g_cond_signal (queue->item_add);

1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676
static gboolean
gst_queue_set_temp_location (GstQueue * queue, const gchar * location)
{
  GstState state;

  /* the element must be stopped in order to do this */
  GST_OBJECT_LOCK (queue);
  state = GST_STATE (queue);
  if (state != GST_STATE_READY && state != GST_STATE_NULL)
    goto wrong_state;
  GST_OBJECT_UNLOCK (queue);

  /* set new location */
  g_free (queue->temp_location);
  queue->temp_location = g_strdup (location);

  g_object_notify (G_OBJECT (queue), "temp-location");

  return TRUE;

/* ERROR */
wrong_state:
  {
    GST_DEBUG_OBJECT (queue, "setting temp-location in wrong state");
    GST_OBJECT_UNLOCK (queue);
    return FALSE;
  }
}

1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715
static void
gst_queue_set_property (GObject * object,
    guint prop_id, const GValue * value, GParamSpec * pspec)
{
  GstQueue *queue = GST_QUEUE (object);

  /* someone could change levels here, and since this
   * affects the get/put funcs, we need to lock for safety. */
  GST_QUEUE_MUTEX_LOCK (queue);

  switch (prop_id) {
    case PROP_MAX_SIZE_BYTES:
      queue->max_level.bytes = g_value_get_uint (value);
      QUEUE_CAPACITY_CHANGE (queue);
      break;
    case PROP_MAX_SIZE_BUFFERS:
      queue->max_level.buffers = g_value_get_uint (value);
      QUEUE_CAPACITY_CHANGE (queue);
      break;
    case PROP_MAX_SIZE_TIME:
      queue->max_level.time = g_value_get_uint64 (value);
      /* set rate_time to the same value. We use an extra field in the level
       * structure so that we can easily access and compare it */
      queue->max_level.rate_time = queue->max_level.time;
      QUEUE_CAPACITY_CHANGE (queue);
      break;
    case PROP_USE_BUFFERING:
      queue->use_buffering = g_value_get_boolean (value);
      break;
    case PROP_USE_RATE_ESTIMATE:
      queue->use_rate_estimate = g_value_get_boolean (value);
      break;
    case PROP_LOW_PERCENT:
      queue->low_percent = g_value_get_int (value);
      break;
    case PROP_HIGH_PERCENT:
      queue->high_percent = g_value_get_int (value);
      break;
    case PROP_TEMP_LOCATION:
1716
      gst_queue_set_temp_location (queue, g_value_dup_string (value));
1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }

  GST_QUEUE_MUTEX_UNLOCK (queue);
}

static void
gst_queue_get_property (GObject * object,
    guint prop_id, GValue * value, GParamSpec * pspec)
{
  GstQueue *queue = GST_QUEUE (object);

  GST_QUEUE_MUTEX_LOCK (queue);

  switch (prop_id) {
    case PROP_CUR_LEVEL_BYTES:
      g_value_set_uint (value, queue->cur_level.bytes);
      break;
    case PROP_CUR_LEVEL_BUFFERS:
      g_value_set_uint (value, queue->cur_level.buffers);
      break;
    case PROP_CUR_LEVEL_TIME:
      g_value_set_uint64 (value, queue->cur_level.time);
      break;
    case PROP_MAX_SIZE_BYTES:
      g_value_set_uint (value, queue->max_level.bytes);
      break;
    case PROP_MAX_SIZE_BUFFERS:
      g_value_set_uint (value, queue->max_level.buffers);
      break;
    case PROP_MAX_SIZE_TIME:
      g_value_set_uint64 (value, queue->max_level.time);
      break;
    case PROP_USE_BUFFERING:
      g_value_set_boolean (value, queue->use_buffering);
      break;
    case PROP_USE_RATE_ESTIMATE:
      g_value_set_boolean (value, queue->use_rate_estimate);
      break;
    case PROP_LOW_PERCENT:
      g_value_set_int (value, queue->low_percent);
      break;
    case PROP_HIGH_PERCENT:
      g_value_set_int (value, queue->high_percent);
      break;
    case PROP_TEMP_LOCATION:
      g_value_set_string (value, queue->temp_location);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }

  GST_QUEUE_MUTEX_UNLOCK (queue);
}

static gboolean
plugin_init (GstPlugin * plugin)
{
  GST_DEBUG_CATEGORY_INIT (queue_debug, "queue", 0, "queue element");
  GST_DEBUG_CATEGORY_INIT (queue_dataflow, "queue_dataflow", 0,
      "dataflow inside the queue element");

#ifdef ENABLE_NLS
  GST_DEBUG ("binding text domain %s to locale dir %s", GETTEXT_PACKAGE,
      LOCALEDIR);
  bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
#endif /* ENABLE_NLS */

  return gst_element_register (plugin, "queue2", GST_RANK_NONE, GST_TYPE_QUEUE);
}

GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "queue2",
    "Queue newer version", plugin_init, VERSION, GST_LICENSE,
    GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)