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gstreamer/libs/gst/base/gstcollectpads.c

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/* GStreamer
* Copyright (C) 2005 Wim Taymans <wim@fluendo.com>
* Copyright (C) 2008 Mark Nauwelaerts <mnauw@users.sourceforge.net>
* Copyright (C) 2010 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* gstcollectpads.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstcollectpads
* @short_description: manages a set of pads that operate in collect mode
* @see_also:
*
* Manages a set of pads that operate in collect mode. This means that control
* is given to the manager of this object when all pads have data.
* <itemizedlist>
* <listitem><para>
* Collectpads are created with gst_collect_pads_new(). A callback should then
* be installed with gst_collect_pads_set_function ().
* </para></listitem>
* <listitem><para>
* Pads are added to the collection with gst_collect_pads_add_pad()/
* gst_collect_pads_remove_pad(). The pad
* has to be a sinkpad. The chain and event functions of the pad are
* overridden. The element_private of the pad is used to store
* private information for the collectpads.
* </para></listitem>
* <listitem><para>
* For each pad, data is queued in the _chain function or by
* performing a pull_range.
* </para></listitem>
* <listitem><para>
* When data is queued on all pads in waiting mode, the callback function is called.
* </para></listitem>
* <listitem><para>
* Data can be dequeued from the pad with the gst_collect_pads_pop() method.
* One can peek at the data with the gst_collect_pads_peek() function.
* These functions will return NULL if the pad received an EOS event. When all
* pads return NULL from a gst_collect_pads_peek(), the element can emit an EOS
* event itself.
* </para></listitem>
* <listitem><para>
* Data can also be dequeued in byte units using the gst_collect_pads_available(),
* gst_collect_pads_read_buffer() and gst_collect_pads_flush() calls.
* </para></listitem>
* <listitem><para>
* Elements should call gst_collect_pads_start() and gst_collect_pads_stop() in
* their state change functions to start and stop the processing of the collectpads.
* The gst_collect_pads_stop() call should be called before calling the parent
* element state change function in the PAUSED_TO_READY state change to ensure
* no pad is blocked and the element can finish streaming.
* </para></listitem>
* <listitem><para>
* gst_collect_pads_set_waiting() sets a pad to waiting or non-waiting mode.
* CollectPads element is not waiting for data to be collected on non-waiting pads.
* Thus these pads may but need not have data when the callback is called.
* All pads are in waiting mode by default.
* </para></listitem>
* </itemizedlist>
*
* Last reviewed on 2011-10-28 (0.10.36)
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/gst_private.h>
#include "gstcollectpads.h"
#include "../../../gst/glib-compat-private.h"
GST_DEBUG_CATEGORY_STATIC (collect_pads_debug);
#define GST_CAT_DEFAULT collect_pads_debug
#define parent_class gst_collect_pads_parent_class
G_DEFINE_TYPE (GstCollectPads, gst_collect_pads, GST_TYPE_OBJECT);
struct _GstCollectDataPrivate
{
/* refcounting for struct, and destroy callback */
GstCollectDataDestroyNotify destroy_notify;
gint refcount;
};
struct _GstCollectPadsPrivate
{
/* with LOCK and/or STREAM_LOCK */
gboolean started;
/* with STREAM_LOCK */
guint32 cookie; /* @data list cookie */
guint numpads; /* number of pads in @data */
guint queuedpads; /* number of pads with a buffer */
guint eospads; /* number of pads that are EOS */
GstClockTime earliest_time; /* Current earliest time */
GstCollectData *earliest_data; /* Pad data for current earliest time */
/* with LOCK */
GSList *pad_list; /* updated pad list */
guint32 pad_cookie; /* updated cookie */
GstCollectPadsFunction func; /* function and user_data for callback */
gpointer user_data;
GstCollectPadsBufferFunction buffer_func; /* function and user_data for buffer callback */
gpointer buffer_user_data;
GstCollectPadsCompareFunction compare_func;
gpointer compare_user_data;
GstCollectPadsEventFunction event_func; /* function and data for event callback */
gpointer event_user_data;
GstCollectPadsQueryFunction query_func;
gpointer query_user_data;
GstCollectPadsClipFunction clip_func;
gpointer clip_user_data;
GstCollectPadsFlushFunction flush_func;
gpointer flush_user_data;
/* no other lock needed */
GMutex evt_lock; /* these make up sort of poor man's event signaling */
GCond evt_cond;
guint32 evt_cookie;
gboolean seeking;
gboolean pending_flush_start;
gboolean pending_flush_stop;
};
static void gst_collect_pads_clear (GstCollectPads * pads,
GstCollectData * data);
static GstFlowReturn gst_collect_pads_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static gboolean gst_collect_pads_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_collect_pads_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static void gst_collect_pads_finalize (GObject * object);
static GstFlowReturn gst_collect_pads_default_collected (GstCollectPads *
pads, gpointer user_data);
static gint gst_collect_pads_default_compare_func (GstCollectPads * pads,
GstCollectData * data1, GstClockTime timestamp1, GstCollectData * data2,
GstClockTime timestamp2, gpointer user_data);
static gboolean gst_collect_pads_recalculate_full (GstCollectPads * pads);
static void ref_data (GstCollectData * data);
static void unref_data (GstCollectData * data);
static gboolean gst_collect_pads_event_default_internal (GstCollectPads *
pads, GstCollectData * data, GstEvent * event, gpointer user_data);
static gboolean gst_collect_pads_query_default_internal (GstCollectPads *
pads, GstCollectData * data, GstQuery * query, gpointer user_data);
/* Some properties are protected by LOCK, others by STREAM_LOCK
* However, manipulating either of these partitions may require
* to signal/wake a _WAIT, so use a separate (sort of) event to prevent races
* Alternative implementations are possible, e.g. some low-level re-implementing
* of the 2 above locks to drop both of them atomically when going into _WAIT.
*/
#define GST_COLLECT_PADS_GET_EVT_COND(pads) (&((GstCollectPads *)pads)->priv->evt_cond)
#define GST_COLLECT_PADS_GET_EVT_LOCK(pads) (&((GstCollectPads *)pads)->priv->evt_lock)
#define GST_COLLECT_PADS_EVT_WAIT(pads, cookie) G_STMT_START { \
g_mutex_lock (GST_COLLECT_PADS_GET_EVT_LOCK (pads)); \
/* should work unless a lot of event'ing and thread starvation */\
while (cookie == ((GstCollectPads *) pads)->priv->evt_cookie) \
g_cond_wait (GST_COLLECT_PADS_GET_EVT_COND (pads), \
GST_COLLECT_PADS_GET_EVT_LOCK (pads)); \
cookie = ((GstCollectPads *) pads)->priv->evt_cookie; \
g_mutex_unlock (GST_COLLECT_PADS_GET_EVT_LOCK (pads)); \
} G_STMT_END
#define GST_COLLECT_PADS_EVT_WAIT_TIMED(pads, cookie, timeout) G_STMT_START { \
GTimeVal __tv; \
\
g_get_current_time (&tv); \
g_time_val_add (&tv, timeout); \
\
g_mutex_lock (GST_COLLECT_PADS_GET_EVT_LOCK (pads)); \
/* should work unless a lot of event'ing and thread starvation */\
while (cookie == ((GstCollectPads *) pads)->priv->evt_cookie) \
g_cond_timed_wait (GST_COLLECT_PADS_GET_EVT_COND (pads), \
GST_COLLECT_PADS_GET_EVT_LOCK (pads), &tv); \
cookie = ((GstCollectPads *) pads)->priv->evt_cookie; \
g_mutex_unlock (GST_COLLECT_PADS_GET_EVT_LOCK (pads)); \
} G_STMT_END
#define GST_COLLECT_PADS_EVT_BROADCAST(pads) G_STMT_START { \
g_mutex_lock (GST_COLLECT_PADS_GET_EVT_LOCK (pads)); \
/* never mind wrap-around */ \
++(((GstCollectPads *) pads)->priv->evt_cookie); \
g_cond_broadcast (GST_COLLECT_PADS_GET_EVT_COND (pads)); \
g_mutex_unlock (GST_COLLECT_PADS_GET_EVT_LOCK (pads)); \
} G_STMT_END
#define GST_COLLECT_PADS_EVT_INIT(cookie) G_STMT_START { \
g_mutex_lock (GST_COLLECT_PADS_GET_EVT_LOCK (pads)); \
cookie = ((GstCollectPads *) pads)->priv->evt_cookie; \
g_mutex_unlock (GST_COLLECT_PADS_GET_EVT_LOCK (pads)); \
} G_STMT_END
static void
gst_collect_pads_class_init (GstCollectPadsClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
g_type_class_add_private (klass, sizeof (GstCollectPadsPrivate));
GST_DEBUG_CATEGORY_INIT (collect_pads_debug, "collectpads", 0,
"GstCollectPads");
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_collect_pads_finalize);
}
static void
gst_collect_pads_init (GstCollectPads * pads)
{
pads->priv =
G_TYPE_INSTANCE_GET_PRIVATE (pads, GST_TYPE_COLLECT_PADS,
GstCollectPadsPrivate);
pads->data = NULL;
pads->priv->cookie = 0;
pads->priv->numpads = 0;
pads->priv->queuedpads = 0;
pads->priv->eospads = 0;
pads->priv->started = FALSE;
g_rec_mutex_init (&pads->stream_lock);
pads->priv->func = gst_collect_pads_default_collected;
pads->priv->user_data = NULL;
pads->priv->event_func = NULL;
pads->priv->event_user_data = NULL;
/* members for default muxing */
pads->priv->buffer_func = NULL;
pads->priv->buffer_user_data = NULL;
pads->priv->compare_func = gst_collect_pads_default_compare_func;
pads->priv->compare_user_data = NULL;
pads->priv->earliest_data = NULL;
pads->priv->earliest_time = GST_CLOCK_TIME_NONE;
pads->priv->event_func = gst_collect_pads_event_default_internal;
pads->priv->query_func = gst_collect_pads_query_default_internal;
/* members to manage the pad list */
pads->priv->pad_cookie = 0;
pads->priv->pad_list = NULL;
/* members for event */
g_mutex_init (&pads->priv->evt_lock);
g_cond_init (&pads->priv->evt_cond);
pads->priv->evt_cookie = 0;
pads->priv->seeking = FALSE;
pads->priv->pending_flush_start = FALSE;
pads->priv->pending_flush_stop = FALSE;
/* clear floating flag */
gst_object_ref_sink (pads);
}
static void
gst_collect_pads_finalize (GObject * object)
{
GstCollectPads *pads = GST_COLLECT_PADS (object);
GST_DEBUG_OBJECT (object, "finalize");
g_rec_mutex_clear (&pads->stream_lock);
g_cond_clear (&pads->priv->evt_cond);
g_mutex_clear (&pads->priv->evt_lock);
/* Remove pads and free pads list */
g_slist_foreach (pads->priv->pad_list, (GFunc) unref_data, NULL);
g_slist_foreach (pads->data, (GFunc) unref_data, NULL);
g_slist_free (pads->data);
g_slist_free (pads->priv->pad_list);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/**
* gst_collect_pads_new:
*
* Create a new instance of #GstCollectPads.
*
* MT safe.
*
* Returns: (transfer full): a new #GstCollectPads, or NULL in case of an error.
*/
GstCollectPads *
gst_collect_pads_new (void)
{
GstCollectPads *newcoll;
newcoll = g_object_new (GST_TYPE_COLLECT_PADS, NULL);
return newcoll;
}
/* Must be called with GstObject lock! */
static void
gst_collect_pads_set_buffer_function_locked (GstCollectPads * pads,
GstCollectPadsBufferFunction func, gpointer user_data)
{
pads->priv->buffer_func = func;
pads->priv->buffer_user_data = user_data;
}
/**
* gst_collect_pads_set_buffer_function:
* @pads: the collectpads to use
* @func: the function to set
* @user_data: (closure): user data passed to the function
*
* Set the callback function and user data that will be called with
* the oldest buffer when all pads have been collected, or NULL on EOS.
* If a buffer is passed, the callback owns a reference and must unref
* it.
*
* MT safe.
*/
void
gst_collect_pads_set_buffer_function (GstCollectPads * pads,
GstCollectPadsBufferFunction func, gpointer user_data)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS (pads));
GST_OBJECT_LOCK (pads);
gst_collect_pads_set_buffer_function_locked (pads, func, user_data);
GST_OBJECT_UNLOCK (pads);
}
/**
* gst_collect_pads_set_compare_function:
* @pads: the pads to use
* @func: the function to set
* @user_data: (closure): user data passed to the function
*
* Set the timestamp comparison function.
*
* MT safe.
*/
/* NOTE allowing to change comparison seems not advisable;
no known use-case, and collaboration with default algorithm is unpredictable.
If custom compairing/operation is needed, just use a collect function of
your own */
void
gst_collect_pads_set_compare_function (GstCollectPads * pads,
GstCollectPadsCompareFunction func, gpointer user_data)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS (pads));
GST_OBJECT_LOCK (pads);
pads->priv->compare_func = func;
pads->priv->compare_user_data = user_data;
GST_OBJECT_UNLOCK (pads);
}
/**
* gst_collect_pads_set_function:
* @pads: the collectpads to use
* @func: the function to set
* @user_data: user data passed to the function
*
* CollectPads provides a default collection algorithm that will determine
* the oldest buffer available on all of its pads, and then delegate
* to a configured callback.
* However, if circumstances are more complicated and/or more control
* is desired, this sets a callback that will be invoked instead when
* all the pads added to the collection have buffers queued.
* Evidently, this callback is not compatible with
* gst_collect_pads_set_buffer_function() callback.
* If this callback is set, the former will be unset.
*
* MT safe.
*/
void
gst_collect_pads_set_function (GstCollectPads * pads,
GstCollectPadsFunction func, gpointer user_data)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS (pads));
GST_OBJECT_LOCK (pads);
pads->priv->func = func;
pads->priv->user_data = user_data;
gst_collect_pads_set_buffer_function_locked (pads, NULL, NULL);
GST_OBJECT_UNLOCK (pads);
}
static void
ref_data (GstCollectData * data)
{
g_assert (data != NULL);
g_atomic_int_inc (&(data->priv->refcount));
}
static void
unref_data (GstCollectData * data)
{
g_assert (data != NULL);
g_assert (data->priv->refcount > 0);
if (!g_atomic_int_dec_and_test (&(data->priv->refcount)))
return;
if (data->priv->destroy_notify)
data->priv->destroy_notify (data);
g_object_unref (data->pad);
if (data->buffer) {
gst_buffer_unref (data->buffer);
}
g_free (data->priv);
g_free (data);
}
/**
* gst_collect_pads_set_event_function:
* @pads: the collectpads to use
* @func: the function to set
* @user_data: user data passed to the function
*
* Set the event callback function and user data that will be called when
* collectpads has received an event originating from one of the collected
* pads. If the event being processed is a serialized one, this callback is
* called with @pads STREAM_LOCK held, otherwise not. As this lock should be
* held when calling a number of CollectPads functions, it should be acquired
* if so (unusually) needed.
*
* MT safe.
*/
void
gst_collect_pads_set_event_function (GstCollectPads * pads,
GstCollectPadsEventFunction func, gpointer user_data)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS (pads));
GST_OBJECT_LOCK (pads);
pads->priv->event_func = func;
pads->priv->event_user_data = user_data;
GST_OBJECT_UNLOCK (pads);
}
/**
* gst_collect_pads_set_query_function:
* @pads: the collectpads to use
* @func: the function to set
* @user_data: user data passed to the function
*
* Set the query callback function and user data that will be called after
* collectpads has received a query originating from one of the collected
* pads. If the query being processed is a serialized one, this callback is
* called with @pads STREAM_LOCK held, otherwise not. As this lock should be
* held when calling a number of CollectPads functions, it should be acquired
* if so (unusually) needed.
*
* MT safe.
*/
void
gst_collect_pads_set_query_function (GstCollectPads * pads,
GstCollectPadsQueryFunction func, gpointer user_data)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS (pads));
GST_OBJECT_LOCK (pads);
pads->priv->query_func = func;
pads->priv->query_user_data = user_data;
GST_OBJECT_UNLOCK (pads);
}
/**
* gst_collect_pads_clip_running_time:
* @pads: the collectpads to use
* @cdata: collect data of corresponding pad
* @buf: buffer being clipped
* @outbuf: (allow-none): output buffer with running time, or NULL if clipped
* @user_data: user data (unused)
*
* Convenience clipping function that converts incoming buffer's timestamp
* to running time, or clips the buffer if outside configured segment.
*/
GstFlowReturn
gst_collect_pads_clip_running_time (GstCollectPads * pads,
GstCollectData * cdata, GstBuffer * buf, GstBuffer ** outbuf,
gpointer user_data)
{
GstClockTime time;
*outbuf = buf;
time = GST_BUFFER_PTS (buf);
/* invalid left alone and passed */
if (G_LIKELY (GST_CLOCK_TIME_IS_VALID (time))) {
time = gst_segment_to_running_time (&cdata->segment, GST_FORMAT_TIME, time);
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (time))) {
GST_DEBUG_OBJECT (cdata->pad, "clipping buffer on pad outside segment %"
GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
gst_buffer_unref (buf);
*outbuf = NULL;
} else {
GST_LOG_OBJECT (cdata->pad, "buffer ts %" GST_TIME_FORMAT " -> %"
GST_TIME_FORMAT " running time",
GST_TIME_ARGS (GST_BUFFER_PTS (buf)), GST_TIME_ARGS (time));
*outbuf = gst_buffer_make_writable (buf);
GST_BUFFER_PTS (*outbuf) = time;
GST_BUFFER_DTS (*outbuf) = gst_segment_to_running_time (&cdata->segment,
GST_FORMAT_TIME, GST_BUFFER_DTS (*outbuf));
}
}
return GST_FLOW_OK;
}
/**
* gst_collect_pads_set_clip_function:
* @pads: the collectpads to use
* @clipfunc: clip function to install
* @user_data: user data to pass to @clip_func
*
* Install a clipping function that is called right after a buffer is received
* on a pad managed by @pads. See #GstCollectPadsClipFunction for more info.
*/
void
gst_collect_pads_set_clip_function (GstCollectPads * pads,
GstCollectPadsClipFunction clipfunc, gpointer user_data)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS (pads));
pads->priv->clip_func = clipfunc;
pads->priv->clip_user_data = user_data;
}
/**
* gst_collect_pads_set_flush_function:
* @pads: the collectpads to use
* @func: flush function to install
* @user_data: user data to pass to @func
*
* Install a flush function that is called when the internal
* state of all pads should be flushed as part of flushing seek
* handling. See #GstCollectPadsFlushFunction for more info.
*
* Since: 1.4
*/
void
gst_collect_pads_set_flush_function (GstCollectPads * pads,
GstCollectPadsFlushFunction func, gpointer user_data)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS (pads));
pads->priv->flush_func = func;
pads->priv->flush_user_data = user_data;
}
/**
* gst_collect_pads_add_pad:
* @pads: the collectpads to use
* @pad: (transfer none): the pad to add
* @size: the size of the returned #GstCollectData structure
* @destroy_notify: function to be called before the returned #GstCollectData
* structure is freed
* @lock: whether to lock this pad in usual waiting state
*
* Add a pad to the collection of collect pads. The pad has to be
* a sinkpad. The refcount of the pad is incremented. Use
* gst_collect_pads_remove_pad() to remove the pad from the collection
* again.
*
* You specify a size for the returned #GstCollectData structure
* so that you can use it to store additional information.
*
* You can also specify a #GstCollectDataDestroyNotify that will be called
* just before the #GstCollectData structure is freed. It is passed the
* pointer to the structure and should free any custom memory and resources
* allocated for it.
*
* Keeping a pad locked in waiting state is only relevant when using
* the default collection algorithm (providing the oldest buffer).
* It ensures a buffer must be available on this pad for a collection
* to take place. This is of typical use to a muxer element where
* non-subtitle streams should always be in waiting state,
* e.g. to assure that caps information is available on all these streams
* when initial headers have to be written.
*
* The pad will be automatically activated in push mode when @pads is
* started.
*
* MT safe.
*
* Returns: a new #GstCollectData to identify the new pad. Or NULL
* if wrong parameters are supplied.
*/
GstCollectData *
gst_collect_pads_add_pad (GstCollectPads * pads, GstPad * pad, guint size,
GstCollectDataDestroyNotify destroy_notify, gboolean lock)
{
GstCollectData *data;
g_return_val_if_fail (pads != NULL, NULL);
g_return_val_if_fail (GST_IS_COLLECT_PADS (pads), NULL);
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_PAD_IS_SINK (pad), NULL);
g_return_val_if_fail (size >= sizeof (GstCollectData), NULL);
GST_DEBUG_OBJECT (pads, "adding pad %s:%s", GST_DEBUG_PAD_NAME (pad));
data = g_malloc0 (size);
data->priv = g_new0 (GstCollectDataPrivate, 1);
data->collect = pads;
data->pad = gst_object_ref (pad);
data->buffer = NULL;
data->pos = 0;
gst_segment_init (&data->segment, GST_FORMAT_UNDEFINED);
data->state = GST_COLLECT_PADS_STATE_WAITING;
data->state |= lock ? GST_COLLECT_PADS_STATE_LOCKED : 0;
data->priv->refcount = 1;
data->priv->destroy_notify = destroy_notify;
GST_OBJECT_LOCK (pads);
GST_OBJECT_LOCK (pad);
gst_pad_set_element_private (pad, data);
GST_OBJECT_UNLOCK (pad);
pads->priv->pad_list = g_slist_append (pads->priv->pad_list, data);
gst_pad_set_chain_function (pad, GST_DEBUG_FUNCPTR (gst_collect_pads_chain));
gst_pad_set_event_function (pad, GST_DEBUG_FUNCPTR (gst_collect_pads_event));
gst_pad_set_query_function (pad, GST_DEBUG_FUNCPTR (gst_collect_pads_query));
/* backward compat, also add to data if stopped, so that the element already
* has this in the public data list before going PAUSED (typically)
* this can only be done when we are stopped because we don't take the
* STREAM_LOCK to protect the pads->data list. */
if (!pads->priv->started) {
pads->data = g_slist_append (pads->data, data);
ref_data (data);
}
/* activate the pad when needed */
if (pads->priv->started)
gst_pad_set_active (pad, TRUE);
pads->priv->pad_cookie++;
GST_OBJECT_UNLOCK (pads);
return data;
}
static gint
find_pad (GstCollectData * data, GstPad * pad)
{
if (data->pad == pad)
return 0;
return 1;
}
/**
* gst_collect_pads_remove_pad:
* @pads: the collectpads to use
* @pad: (transfer none): the pad to remove
*
* Remove a pad from the collection of collect pads. This function will also
* free the #GstCollectData and all the resources that were allocated with
* gst_collect_pads_add_pad().
*
* The pad will be deactivated automatically when @pads is stopped.
*
* MT safe.
*
* Returns: %TRUE if the pad could be removed.
*/
gboolean
gst_collect_pads_remove_pad (GstCollectPads * pads, GstPad * pad)
{
GstCollectData *data;
GSList *list;
g_return_val_if_fail (pads != NULL, FALSE);
g_return_val_if_fail (GST_IS_COLLECT_PADS (pads), FALSE);
g_return_val_if_fail (pad != NULL, FALSE);
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
GST_DEBUG_OBJECT (pads, "removing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
GST_OBJECT_LOCK (pads);
list =
g_slist_find_custom (pads->priv->pad_list, pad, (GCompareFunc) find_pad);
if (!list)
goto unknown_pad;
data = (GstCollectData *) list->data;
GST_DEBUG_OBJECT (pads, "found pad %s:%s at %p", GST_DEBUG_PAD_NAME (pad),
data);
/* clear the stuff we configured */
gst_pad_set_chain_function (pad, NULL);
gst_pad_set_event_function (pad, NULL);
GST_OBJECT_LOCK (pad);
gst_pad_set_element_private (pad, NULL);
GST_OBJECT_UNLOCK (pad);
/* backward compat, also remove from data if stopped, note that this function
* can only be called when we are stopped because we don't take the
* STREAM_LOCK to protect the pads->data list. */
if (!pads->priv->started) {
GSList *dlist;
dlist = g_slist_find_custom (pads->data, pad, (GCompareFunc) find_pad);
if (dlist) {
GstCollectData *pdata = dlist->data;
pads->data = g_slist_delete_link (pads->data, dlist);
unref_data (pdata);
}
}
/* remove from the pad list */
pads->priv->pad_list = g_slist_delete_link (pads->priv->pad_list, list);
pads->priv->pad_cookie++;
/* signal waiters because something changed */
GST_COLLECT_PADS_EVT_BROADCAST (pads);
/* deactivate the pad when needed */
if (!pads->priv->started)
gst_pad_set_active (pad, FALSE);
/* clean and free the collect data */
unref_data (data);
GST_OBJECT_UNLOCK (pads);
return TRUE;
unknown_pad:
{
GST_WARNING_OBJECT (pads, "cannot remove unknown pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
GST_OBJECT_UNLOCK (pads);
return FALSE;
}
}
/*
* Must be called with STREAM_LOCK and OBJECT_LOCK.
*/
static void
gst_collect_pads_set_flushing_unlocked (GstCollectPads * pads,
gboolean flushing)
{
GSList *walk = NULL;
/* Update the pads flushing flag */
for (walk = pads->priv->pad_list; walk; walk = g_slist_next (walk)) {
GstCollectData *cdata = walk->data;
if (GST_IS_PAD (cdata->pad)) {
GST_OBJECT_LOCK (cdata->pad);
if (flushing)
GST_PAD_SET_FLUSHING (cdata->pad);
else
GST_PAD_UNSET_FLUSHING (cdata->pad);
if (flushing)
GST_COLLECT_PADS_STATE_SET (cdata, GST_COLLECT_PADS_STATE_FLUSHING);
else
GST_COLLECT_PADS_STATE_UNSET (cdata, GST_COLLECT_PADS_STATE_FLUSHING);
gst_collect_pads_clear (pads, cdata);
GST_OBJECT_UNLOCK (cdata->pad);
}
}
/* inform _chain of changes */
GST_COLLECT_PADS_EVT_BROADCAST (pads);
}
/**
* gst_collect_pads_set_flushing:
* @pads: the collectpads to use
* @flushing: desired state of the pads
*
* Change the flushing state of all the pads in the collection. No pad
* is able to accept anymore data when @flushing is %TRUE. Calling this
* function with @flushing %FALSE makes @pads accept data again.
* Caller must ensure that downstream streaming (thread) is not blocked,
* e.g. by sending a FLUSH_START downstream.
*
* MT safe.
*/
void
gst_collect_pads_set_flushing (GstCollectPads * pads, gboolean flushing)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS (pads));
/* NOTE since this eventually calls _pop, some (STREAM_)LOCK is needed here */
GST_COLLECT_PADS_STREAM_LOCK (pads);
GST_OBJECT_LOCK (pads);
gst_collect_pads_set_flushing_unlocked (pads, flushing);
GST_OBJECT_UNLOCK (pads);
GST_COLLECT_PADS_STREAM_UNLOCK (pads);
}
/**
* gst_collect_pads_start:
* @pads: the collectpads to use
*
* Starts the processing of data in the collect_pads.
*
* MT safe.
*/
void
gst_collect_pads_start (GstCollectPads * pads)
{
GSList *collected;
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS (pads));
GST_DEBUG_OBJECT (pads, "starting collect pads");
/* make sure stop and collect cannot be called anymore */
GST_COLLECT_PADS_STREAM_LOCK (pads);
/* make pads streamable */
GST_OBJECT_LOCK (pads);
/* loop over the master pad list and reset the segment */
collected = pads->priv->pad_list;
for (; collected; collected = g_slist_next (collected)) {
GstCollectData *data;
data = collected->data;
gst_segment_init (&data->segment, GST_FORMAT_UNDEFINED);
}
gst_collect_pads_set_flushing_unlocked (pads, FALSE);
/* Start collect pads */
pads->priv->started = TRUE;
GST_OBJECT_UNLOCK (pads);
GST_COLLECT_PADS_STREAM_UNLOCK (pads);
}
/**
* gst_collect_pads_stop:
* @pads: the collectpads to use
*
* Stops the processing of data in the collect_pads. this function
* will also unblock any blocking operations.
*
* MT safe.
*/
void
gst_collect_pads_stop (GstCollectPads * pads)
{
GSList *collected;
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS (pads));
GST_DEBUG_OBJECT (pads, "stopping collect pads");
/* make sure collect and start cannot be called anymore */
GST_COLLECT_PADS_STREAM_LOCK (pads);
/* make pads not accept data anymore */
GST_OBJECT_LOCK (pads);
gst_collect_pads_set_flushing_unlocked (pads, TRUE);
/* Stop collect pads */
pads->priv->started = FALSE;
pads->priv->eospads = 0;
pads->priv->queuedpads = 0;
/* loop over the master pad list and flush buffers */
collected = pads->priv->pad_list;
for (; collected; collected = g_slist_next (collected)) {
GstCollectData *data;
GstBuffer **buffer_p;
data = collected->data;
if (data->buffer) {
buffer_p = &data->buffer;
gst_buffer_replace (buffer_p, NULL);
data->pos = 0;
}
GST_COLLECT_PADS_STATE_UNSET (data, GST_COLLECT_PADS_STATE_EOS);
}
if (pads->priv->earliest_data)
unref_data (pads->priv->earliest_data);
pads->priv->earliest_data = NULL;
pads->priv->earliest_time = GST_CLOCK_TIME_NONE;
GST_OBJECT_UNLOCK (pads);
/* Wake them up so they can end the chain functions. */
GST_COLLECT_PADS_EVT_BROADCAST (pads);
GST_COLLECT_PADS_STREAM_UNLOCK (pads);
}
/**
* gst_collect_pads_peek:
* @pads: the collectpads to peek
* @data: the data to use
*
* Peek at the buffer currently queued in @data. This function
* should be called with the @pads STREAM_LOCK held, such as in the callback
* handler.
*
* MT safe.
*
* Returns: The buffer in @data or NULL if no buffer is queued.
* should unref the buffer after usage.
*/
GstBuffer *
gst_collect_pads_peek (GstCollectPads * pads, GstCollectData * data)
{
GstBuffer *result;
g_return_val_if_fail (pads != NULL, NULL);
g_return_val_if_fail (GST_IS_COLLECT_PADS (pads), NULL);
g_return_val_if_fail (data != NULL, NULL);
if ((result = data->buffer))
gst_buffer_ref (result);
GST_DEBUG_OBJECT (pads, "Peeking at pad %s:%s: buffer=%p",
GST_DEBUG_PAD_NAME (data->pad), result);
return result;
}
/**
* gst_collect_pads_pop:
* @pads: the collectpads to pop
* @data: the data to use
*
* Pop the buffer currently queued in @data. This function
* should be called with the @pads STREAM_LOCK held, such as in the callback
* handler.
*
* MT safe.
*
* Returns: (transfer full): The buffer in @data or NULL if no buffer was
* queued. You should unref the buffer after usage.
*/
GstBuffer *
gst_collect_pads_pop (GstCollectPads * pads, GstCollectData * data)
{
GstBuffer *result;
g_return_val_if_fail (pads != NULL, NULL);
g_return_val_if_fail (GST_IS_COLLECT_PADS (pads), NULL);
g_return_val_if_fail (data != NULL, NULL);
if ((result = data->buffer)) {
data->buffer = NULL;
data->pos = 0;
/* one less pad with queued data now */
if (GST_COLLECT_PADS_STATE_IS_SET (data, GST_COLLECT_PADS_STATE_WAITING))
pads->priv->queuedpads--;
}
GST_COLLECT_PADS_EVT_BROADCAST (pads);
GST_DEBUG_OBJECT (pads, "Pop buffer on pad %s:%s: buffer=%p",
GST_DEBUG_PAD_NAME (data->pad), result);
return result;
}
/* pop and unref the currently queued buffer, should be called with STREAM_LOCK
* held */
static void
gst_collect_pads_clear (GstCollectPads * pads, GstCollectData * data)
{
GstBuffer *buf;
if ((buf = gst_collect_pads_pop (pads, data)))
gst_buffer_unref (buf);
}
/**
* gst_collect_pads_available:
* @pads: the collectpads to query
*
* Query how much bytes can be read from each queued buffer. This means
* that the result of this call is the maximum number of bytes that can
* be read from each of the pads.
*
* This function should be called with @pads STREAM_LOCK held, such as
* in the callback.
*
* MT safe.
*
* Returns: The maximum number of bytes queued on all pads. This function
* returns 0 if a pad has no queued buffer.
*/
/* we might pre-calculate this in some struct field,
* but would then have to maintain this in _chain and particularly _pop, etc,
* even if element is never interested in this information */
guint
gst_collect_pads_available (GstCollectPads * pads)
{
GSList *collected;
guint result = G_MAXUINT;
g_return_val_if_fail (pads != NULL, 0);
g_return_val_if_fail (GST_IS_COLLECT_PADS (pads), 0);
collected = pads->data;
for (; collected; collected = g_slist_next (collected)) {
GstCollectData *pdata;
GstBuffer *buffer;
gint size;
pdata = (GstCollectData *) collected->data;
/* ignore pad with EOS */
if (G_UNLIKELY (GST_COLLECT_PADS_STATE_IS_SET (pdata,
GST_COLLECT_PADS_STATE_EOS))) {
GST_DEBUG_OBJECT (pads, "pad %p is EOS", pdata);
continue;
}
/* an empty buffer without EOS is weird when we get here.. */
if (G_UNLIKELY ((buffer = pdata->buffer) == NULL)) {
GST_WARNING_OBJECT (pads, "pad %p has no buffer", pdata);
goto not_filled;
}
/* this is the size left of the buffer */
size = gst_buffer_get_size (buffer) - pdata->pos;
GST_DEBUG_OBJECT (pads, "pad %p has %d bytes left", pdata, size);
/* need to return the min of all available data */
if (size < result)
result = size;
}
/* nothing changed, all must be EOS then, return 0 */
if (G_UNLIKELY (result == G_MAXUINT))
result = 0;
return result;
not_filled:
{
return 0;
}
}
/**
* gst_collect_pads_flush:
* @pads: the collectpads to query
* @data: the data to use
* @size: the number of bytes to flush
*
* Flush @size bytes from the pad @data.
*
* This function should be called with @pads STREAM_LOCK held, such as
* in the callback.
*
* MT safe.
*
* Returns: The number of bytes flushed This can be less than @size and
* is 0 if the pad was end-of-stream.
*/
guint
gst_collect_pads_flush (GstCollectPads * pads, GstCollectData * data,
guint size)
{
guint flushsize;
gsize bsize;
GstBuffer *buffer;
g_return_val_if_fail (pads != NULL, 0);
g_return_val_if_fail (GST_IS_COLLECT_PADS (pads), 0);
g_return_val_if_fail (data != NULL, 0);
/* no buffer, must be EOS */
if ((buffer = data->buffer) == NULL)
return 0;
bsize = gst_buffer_get_size (buffer);
/* this is what we can flush at max */
flushsize = MIN (size, bsize - data->pos);
data->pos += size;
if (data->pos >= bsize)
/* _clear will also reset data->pos to 0 */
gst_collect_pads_clear (pads, data);
return flushsize;
}
/**
* gst_collect_pads_read_buffer:
* @pads: the collectpads to query
* @data: the data to use
* @size: the number of bytes to read
*
* Get a subbuffer of @size bytes from the given pad @data.
*
* This function should be called with @pads STREAM_LOCK held, such as in the
* callback.
*
* MT safe.
*
* Returns: (transfer full): A sub buffer. The size of the buffer can be less that requested.
* A return of NULL signals that the pad is end-of-stream.
* Unref the buffer after use.
*/
GstBuffer *
gst_collect_pads_read_buffer (GstCollectPads * pads, GstCollectData * data,
guint size)
{
guint readsize;
GstBuffer *buffer;
g_return_val_if_fail (pads != NULL, NULL);
g_return_val_if_fail (GST_IS_COLLECT_PADS (pads), NULL);
g_return_val_if_fail (data != NULL, NULL);
/* no buffer, must be EOS */
if ((buffer = data->buffer) == NULL)
return NULL;
readsize = MIN (size, gst_buffer_get_size (buffer) - data->pos);
return gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, data->pos,
readsize);
}
/**
* gst_collect_pads_take_buffer:
* @pads: the collectpads to query
* @data: the data to use
* @size: the number of bytes to read
*
* Get a subbuffer of @size bytes from the given pad @data. Flushes the amount
* of read bytes.
*
* This function should be called with @pads STREAM_LOCK held, such as in the
* callback.
*
* MT safe.
*
* Returns: A sub buffer. The size of the buffer can be less that requested.
* A return of NULL signals that the pad is end-of-stream.
* Unref the buffer after use.
*/
GstBuffer *
gst_collect_pads_take_buffer (GstCollectPads * pads, GstCollectData * data,
guint size)
{
GstBuffer *buffer = gst_collect_pads_read_buffer (pads, data, size);
if (buffer) {
gst_collect_pads_flush (pads, data, gst_buffer_get_size (buffer));
}
return buffer;
}
/**
* gst_collect_pads_set_waiting:
* @pads: the collectpads
* @data: the data to use
* @waiting: boolean indicating whether this pad should operate
* in waiting or non-waiting mode
*
* Sets a pad to waiting or non-waiting mode, if at least this pad
* has not been created with locked waiting state,
* in which case nothing happens.
*
* This function should be called with @pads STREAM_LOCK held, such as
* in the callback.
*
* MT safe.
*/
void
gst_collect_pads_set_waiting (GstCollectPads * pads, GstCollectData * data,
gboolean waiting)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS (pads));
g_return_if_fail (data != NULL);
GST_DEBUG_OBJECT (pads, "Setting pad %s to waiting %d, locked %d",
GST_PAD_NAME (data->pad), waiting,
GST_COLLECT_PADS_STATE_IS_SET (data, GST_COLLECT_PADS_STATE_LOCKED));
/* Do something only on a change and if not locked */
if (!GST_COLLECT_PADS_STATE_IS_SET (data, GST_COLLECT_PADS_STATE_LOCKED) &&
(GST_COLLECT_PADS_STATE_IS_SET (data, GST_COLLECT_PADS_STATE_WAITING) !=
! !waiting)) {
/* Set waiting state for this pad */
if (waiting)
GST_COLLECT_PADS_STATE_SET (data, GST_COLLECT_PADS_STATE_WAITING);
else
GST_COLLECT_PADS_STATE_UNSET (data, GST_COLLECT_PADS_STATE_WAITING);
/* Update number of queued pads if needed */
if (!data->buffer &&
!GST_COLLECT_PADS_STATE_IS_SET (data, GST_COLLECT_PADS_STATE_EOS)) {
if (waiting)
pads->priv->queuedpads--;
else
pads->priv->queuedpads++;
}
/* signal waiters because something changed */
GST_COLLECT_PADS_EVT_BROADCAST (pads);
}
}
/* see if pads were added or removed and update our stats. Any pad
* added after releasing the LOCK will get collected in the next
* round.
*
* We can do a quick check by checking the cookies, that get changed
* whenever the pad list is updated.
*
* Must be called with STREAM_LOCK.
*/
static void
gst_collect_pads_check_pads (GstCollectPads * pads)
{
/* the master list and cookie are protected with LOCK */
GST_OBJECT_LOCK (pads);
if (G_UNLIKELY (pads->priv->pad_cookie != pads->priv->cookie)) {
GSList *collected;
/* clear list and stats */
g_slist_foreach (pads->data, (GFunc) unref_data, NULL);
g_slist_free (pads->data);
pads->data = NULL;
pads->priv->numpads = 0;
pads->priv->queuedpads = 0;
pads->priv->eospads = 0;
if (pads->priv->earliest_data)
unref_data (pads->priv->earliest_data);
pads->priv->earliest_data = NULL;
pads->priv->earliest_time = GST_CLOCK_TIME_NONE;
/* loop over the master pad list */
collected = pads->priv->pad_list;
for (; collected; collected = g_slist_next (collected)) {
GstCollectData *data;
/* update the stats */
pads->priv->numpads++;
data = collected->data;
if (GST_COLLECT_PADS_STATE_IS_SET (data, GST_COLLECT_PADS_STATE_EOS))
pads->priv->eospads++;
else if (data->buffer || !GST_COLLECT_PADS_STATE_IS_SET (data,
GST_COLLECT_PADS_STATE_WAITING))
pads->priv->queuedpads++;
/* add to the list of pads to collect */
ref_data (data);
/* preserve order of adding/requesting pads */
pads->data = g_slist_append (pads->data, data);
}
/* and update the cookie */
pads->priv->cookie = pads->priv->pad_cookie;
}
GST_OBJECT_UNLOCK (pads);
}
/* checks if all the pads are collected and call the collectfunction
*
* Should be called with STREAM_LOCK.
*
* Returns: The #GstFlowReturn of collection.
*/
static GstFlowReturn
gst_collect_pads_check_collected (GstCollectPads * pads)
{
GstFlowReturn flow_ret = GST_FLOW_OK;
GstCollectPadsFunction func;
gpointer user_data;
g_return_val_if_fail (GST_IS_COLLECT_PADS (pads), GST_FLOW_ERROR);
GST_OBJECT_LOCK (pads);
func = pads->priv->func;
user_data = pads->priv->user_data;
GST_OBJECT_UNLOCK (pads);
g_return_val_if_fail (pads->priv->func != NULL, GST_FLOW_NOT_SUPPORTED);
/* check for new pads, update stats etc.. */
gst_collect_pads_check_pads (pads);
if (G_UNLIKELY (pads->priv->eospads == pads->priv->numpads)) {
/* If all our pads are EOS just collect once to let the element
* do its final EOS handling. */
GST_DEBUG_OBJECT (pads, "All active pads (%d) are EOS, calling %s",
pads->priv->numpads, GST_DEBUG_FUNCPTR_NAME (func));
if (G_UNLIKELY (g_atomic_int_compare_and_exchange (&pads->priv->seeking,
TRUE, FALSE) == TRUE)) {
GST_INFO_OBJECT (pads, "finished seeking");
}
do {
flow_ret = func (pads, user_data);
} while (flow_ret == GST_FLOW_OK);
} else {
gboolean collected = FALSE;
/* We call the collected function as long as our condition matches. */
while (((pads->priv->queuedpads + pads->priv->eospads) >=
pads->priv->numpads)) {
GST_DEBUG_OBJECT (pads,
"All active pads (%d + %d >= %d) have data, " "calling %s",
pads->priv->queuedpads, pads->priv->eospads, pads->priv->numpads,
GST_DEBUG_FUNCPTR_NAME (func));
if (G_UNLIKELY (g_atomic_int_compare_and_exchange (&pads->priv->seeking,
TRUE, FALSE) == TRUE)) {
GST_INFO_OBJECT (pads, "finished seeking");
}
flow_ret = func (pads, user_data);
collected = TRUE;
/* break on error */
if (flow_ret != GST_FLOW_OK)
break;
/* Don't keep looping after telling the element EOS or flushing */
if (pads->priv->queuedpads == 0)
break;
}
if (!collected)
GST_DEBUG_OBJECT (pads, "Not all active pads (%d) have data, continuing",
pads->priv->numpads);
}
return flow_ret;
}
/* General overview:
* - only pad with a buffer can determine earliest_data (and earliest_time)
* - only segment info determines (non-)waiting state
* - ? perhaps use _stream_time for comparison
* (which muxers might have use as well ?)
*/
/*
* Function to recalculate the waiting state of all pads.
*
* Must be called with STREAM_LOCK.
*
* Returns TRUE if a pad was set to waiting
* (from non-waiting state).
*/
static gboolean
gst_collect_pads_recalculate_waiting (GstCollectPads * pads)
{
GSList *collected;
gboolean result = FALSE;
/* If earliest time is not known, there is nothing to do. */
if (pads->priv->earliest_data == NULL)
return FALSE;
for (collected = pads->data; collected; collected = g_slist_next (collected)) {
GstCollectData *data = (GstCollectData *) collected->data;
int cmp_res;
GstClockTime comp_time;
/* check if pad has a segment */
if (data->segment.format == GST_FORMAT_UNDEFINED) {
GST_WARNING_OBJECT (pads,
"GstCollectPads has no time segment, assuming 0 based.");
gst_segment_init (&data->segment, GST_FORMAT_TIME);
GST_COLLECT_PADS_STATE_SET (data, GST_COLLECT_PADS_STATE_NEW_SEGMENT);
}
/* check segment format */
if (data->segment.format != GST_FORMAT_TIME) {
GST_ERROR_OBJECT (pads, "GstCollectPads can handle only time segments.");
continue;
}
/* check if the waiting state should be changed */
comp_time = data->segment.position;
cmp_res = pads->priv->compare_func (pads, data, comp_time,
pads->priv->earliest_data, pads->priv->earliest_time,
pads->priv->compare_user_data);
if (cmp_res > 0)
/* stop waiting */
gst_collect_pads_set_waiting (pads, data, FALSE);
else {
if (!GST_COLLECT_PADS_STATE_IS_SET (data, GST_COLLECT_PADS_STATE_WAITING)) {
/* start waiting */
gst_collect_pads_set_waiting (pads, data, TRUE);
result = TRUE;
}
}
}
return result;
}
/**
* gst_collect_pads_find_best_pad:
* @pads: the collectpads to use
* @data: returns the collectdata for earliest data
* @time: returns the earliest available buffertime
*
* Find the oldest/best pad, i.e. pad holding the oldest buffer and
* and return the corresponding #GstCollectData and buffertime.
*
* This function should be called with STREAM_LOCK held,
* such as in the callback.
*/
static void
gst_collect_pads_find_best_pad (GstCollectPads * pads,
GstCollectData ** data, GstClockTime * time)
{
GSList *collected;
GstCollectData *best = NULL;
GstClockTime best_time = GST_CLOCK_TIME_NONE;
g_return_if_fail (data != NULL);
g_return_if_fail (time != NULL);
for (collected = pads->data; collected; collected = g_slist_next (collected)) {
GstBuffer *buffer;
GstCollectData *data = (GstCollectData *) collected->data;
GstClockTime timestamp;
buffer = gst_collect_pads_peek (pads, data);
/* if we have a buffer check if it is better then the current best one */
if (buffer != NULL) {
timestamp = GST_BUFFER_DTS (buffer);
if (!GST_CLOCK_TIME_IS_VALID (timestamp)) {
timestamp = GST_BUFFER_PTS (buffer);
}
gst_buffer_unref (buffer);
if (best == NULL || pads->priv->compare_func (pads, data, timestamp,
best, best_time, pads->priv->compare_user_data) < 0) {
best = data;
best_time = timestamp;
}
}
}
/* set earliest time */
*data = best;
*time = best_time;
GST_DEBUG_OBJECT (pads, "best pad %s, best time %" GST_TIME_FORMAT,
best ? GST_PAD_NAME (((GstCollectData *) best)->pad) : "(nil)",
GST_TIME_ARGS (best_time));
}
/*
* Function to recalculate earliest_data and earliest_timestamp. This also calls
* gst_collect_pads_recalculate_waiting
*
* Must be called with STREAM_LOCK.
*/
static gboolean
gst_collect_pads_recalculate_full (GstCollectPads * pads)
{
if (pads->priv->earliest_data)
unref_data (pads->priv->earliest_data);
gst_collect_pads_find_best_pad (pads, &pads->priv->earliest_data,
&pads->priv->earliest_time);
if (pads->priv->earliest_data)
ref_data (pads->priv->earliest_data);
return gst_collect_pads_recalculate_waiting (pads);
}
/*
* Default collect callback triggered when #GstCollectPads gathered all data.
*
* Called with STREAM_LOCK.
*/
static GstFlowReturn
gst_collect_pads_default_collected (GstCollectPads * pads, gpointer user_data)
{
GstCollectData *best = NULL;
GstBuffer *buffer;
GstFlowReturn ret = GST_FLOW_OK;
GstCollectPadsBufferFunction func;
gpointer buffer_user_data;
g_return_val_if_fail (GST_IS_COLLECT_PADS (pads), GST_FLOW_ERROR);
GST_OBJECT_LOCK (pads);
func = pads->priv->buffer_func;
buffer_user_data = pads->priv->buffer_user_data;
GST_OBJECT_UNLOCK (pads);
g_return_val_if_fail (func != NULL, GST_FLOW_NOT_SUPPORTED);
/* Find the oldest pad at all cost */
if (gst_collect_pads_recalculate_full (pads)) {
/* waiting was switched on,
* so give another thread a chance to deliver a possibly
* older buffer; don't charge on yet with the current oldest */
ret = GST_FLOW_OK;
goto done;
}
best = pads->priv->earliest_data;
/* No data collected means EOS. */
if (G_UNLIKELY (best == NULL)) {
ret = func (pads, best, NULL, buffer_user_data);
if (ret == GST_FLOW_OK)
ret = GST_FLOW_EOS;
goto done;
}
/* make sure that the pad we take a buffer from is waiting;
* otherwise popping a buffer will seem not to have happened
* and collectpads can get into a busy loop */
gst_collect_pads_set_waiting (pads, best, TRUE);
/* Send buffer */
buffer = gst_collect_pads_pop (pads, best);
ret = func (pads, best, buffer, buffer_user_data);
/* maybe non-waiting was forced to waiting above due to
* newsegment events coming too sparsely,
* so re-check to restore state to avoid hanging/waiting */
gst_collect_pads_recalculate_full (pads);
done:
return ret;
}
/*
* Default timestamp compare function.
*/
static gint
gst_collect_pads_default_compare_func (GstCollectPads * pads,
GstCollectData * data1, GstClockTime timestamp1,
GstCollectData * data2, GstClockTime timestamp2, gpointer user_data)
{
GST_LOG_OBJECT (pads, "comparing %" GST_TIME_FORMAT
" and %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp1),
GST_TIME_ARGS (timestamp2));
/* non-valid timestamps go first as they are probably headers or so */
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (timestamp1)))
return GST_CLOCK_TIME_IS_VALID (timestamp2) ? -1 : 0;
if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (timestamp2)))
return 1;
/* compare timestamp */
if (timestamp1 < timestamp2)
return -1;
if (timestamp1 > timestamp2)
return 1;
return 0;
}
/* called with STREAM_LOCK */
static void
gst_collect_pads_handle_position_update (GstCollectPads * pads,
GstCollectData * data, GstClockTime new_pos)
{
gint cmp_res;
/* If oldest time is not known, or current pad got newsegment;
* recalculate the state */
if (!pads->priv->earliest_data || pads->priv->earliest_data == data) {
gst_collect_pads_recalculate_full (pads);
goto exit;
}
/* Check if the waiting state of the pad should change. */
cmp_res =
pads->priv->compare_func (pads, data, new_pos,
pads->priv->earliest_data, pads->priv->earliest_time,
pads->priv->compare_user_data);
if (cmp_res > 0)
/* Stop waiting */
gst_collect_pads_set_waiting (pads, data, FALSE);
exit:
return;
}
static GstClockTime
gst_collect_pads_clip_time (GstCollectPads * pads, GstCollectData * data,
GstClockTime time)
{
GstClockTime otime = time;
GstBuffer *in, *out = NULL;
if (pads->priv->clip_func) {
in = gst_buffer_new ();
GST_BUFFER_PTS (in) = time;
GST_BUFFER_DTS (in) = time;
pads->priv->clip_func (pads, data, in, &out, pads->priv->clip_user_data);
if (out) {
otime = GST_BUFFER_PTS (out);
gst_buffer_unref (out);
} else {
/* FIXME should distinguish between ahead or after segment,
* let's assume after segment and use some large time ... */
otime = G_MAXINT64 / 2;
}
}
return otime;
}
/**
* gst_collect_pads_event_default:
* @pads: the collectpads to use
* @data: collect data of corresponding pad
* @event: event being processed
* @discard: process but do not send event downstream
*
* Default GstCollectPads event handling that elements should always
* chain up to to ensure proper operation. Element might however indicate
* event should not be forwarded downstream.
*/
gboolean
gst_collect_pads_event_default (GstCollectPads * pads, GstCollectData * data,
GstEvent * event, gboolean discard)
{
gboolean res = TRUE;
GstCollectPadsBufferFunction buffer_func;
GstObject *parent;
GstPad *pad;
GST_OBJECT_LOCK (pads);
buffer_func = pads->priv->buffer_func;
GST_OBJECT_UNLOCK (pads);
pad = data->pad;
parent = GST_OBJECT_PARENT (pad);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
{
if (g_atomic_int_get (&pads->priv->seeking)) {
/* drop all but the first FLUSH_STARTs when seeking */
if (g_atomic_int_compare_and_exchange (&pads->priv->pending_flush_start,
TRUE, FALSE) == FALSE)
goto eat;
/* unblock collect pads */
gst_pad_event_default (pad, parent, event);
event = NULL;
GST_COLLECT_PADS_STREAM_LOCK (pads);
/* Start flushing. We never call gst_collect_pads_set_flushing (FALSE), we
* instead wait until each pad gets its FLUSH_STOP and let that reset the pad to
* non-flushing (which happens in gst_collect_pads_event_default).
*/
gst_collect_pads_set_flushing (pads, TRUE);
if (pads->priv->flush_func)
pads->priv->flush_func (pads, pads->priv->flush_user_data);
g_atomic_int_set (&pads->priv->pending_flush_stop, TRUE);
GST_COLLECT_PADS_STREAM_UNLOCK (pads);
goto eat;
} else {
/* forward event to unblock check_collected */
GST_DEBUG_OBJECT (pad, "forwarding flush start");
res = gst_pad_event_default (pad, parent, event);
event = NULL;
/* now unblock the chain function.
* no cond per pad, so they all unblock,
* non-flushing block again */
GST_COLLECT_PADS_STREAM_LOCK (pads);
GST_COLLECT_PADS_STATE_SET (data, GST_COLLECT_PADS_STATE_FLUSHING);
gst_collect_pads_clear (pads, data);
/* cater for possible default muxing functionality */
if (buffer_func) {
/* restore to initial state */
gst_collect_pads_set_waiting (pads, data, TRUE);
/* if the current pad is affected, reset state, recalculate later */
if (pads->priv->earliest_data == data) {
unref_data (data);
pads->priv->earliest_data = NULL;
pads->priv->earliest_time = GST_CLOCK_TIME_NONE;
}
}
GST_COLLECT_PADS_STREAM_UNLOCK (pads);
goto eat;
}
}
case GST_EVENT_FLUSH_STOP:
{
/* flush the 1 buffer queue */
GST_COLLECT_PADS_STREAM_LOCK (pads);
GST_COLLECT_PADS_STATE_UNSET (data, GST_COLLECT_PADS_STATE_FLUSHING);
gst_collect_pads_clear (pads, data);
/* we need new segment info after the flush */
gst_segment_init (&data->segment, GST_FORMAT_UNDEFINED);
GST_COLLECT_PADS_STATE_UNSET (data, GST_COLLECT_PADS_STATE_NEW_SEGMENT);
/* if the pad was EOS, remove the EOS flag and
* decrement the number of eospads */
if (G_UNLIKELY (GST_COLLECT_PADS_STATE_IS_SET (data,
GST_COLLECT_PADS_STATE_EOS))) {
if (!GST_COLLECT_PADS_STATE_IS_SET (data,
GST_COLLECT_PADS_STATE_WAITING))
pads->priv->queuedpads++;
pads->priv->eospads--;
GST_COLLECT_PADS_STATE_UNSET (data, GST_COLLECT_PADS_STATE_EOS);
}
GST_COLLECT_PADS_STREAM_UNLOCK (pads);
if (g_atomic_int_get (&pads->priv->seeking)) {
if (g_atomic_int_compare_and_exchange (&pads->priv->pending_flush_stop,
TRUE, FALSE))
goto forward;
else
goto eat;
} else {
goto forward;
}
}
case GST_EVENT_EOS:
{
GST_COLLECT_PADS_STREAM_LOCK (pads);
/* if the pad was not EOS, make it EOS and so we
* have one more eospad */
if (G_LIKELY (!GST_COLLECT_PADS_STATE_IS_SET (data,
GST_COLLECT_PADS_STATE_EOS))) {
GST_COLLECT_PADS_STATE_SET (data, GST_COLLECT_PADS_STATE_EOS);
if (!GST_COLLECT_PADS_STATE_IS_SET (data,
GST_COLLECT_PADS_STATE_WAITING))
pads->priv->queuedpads--;
pads->priv->eospads++;
}
/* check if we need collecting anything, we ignore the result. */
gst_collect_pads_check_collected (pads);
GST_COLLECT_PADS_STREAM_UNLOCK (pads);
goto eat;
}
case GST_EVENT_SEGMENT:
{
GstSegment seg;
GST_COLLECT_PADS_STREAM_LOCK (pads);
gst_event_copy_segment (event, &seg);
GST_DEBUG_OBJECT (data->pad, "got segment %" GST_SEGMENT_FORMAT, &seg);
/* default collection can not handle other segment formats than time */
if (buffer_func && seg.format != GST_FORMAT_TIME) {
GST_WARNING_OBJECT (pads, "GstCollectPads default collecting "
"can only handle time segments. Non time segment ignored.");
goto newsegment_done;
}
/* need to update segment first */
data->segment = seg;
GST_COLLECT_PADS_STATE_SET (data, GST_COLLECT_PADS_STATE_NEW_SEGMENT);
/* now we can use for e.g. running time */
seg.position =
gst_collect_pads_clip_time (pads, data, seg.start + seg.offset);
/* update again */
data->segment = seg;
/* default muxing functionality */
if (!buffer_func)
goto newsegment_done;
gst_collect_pads_handle_position_update (pads, data, seg.position);
newsegment_done:
GST_COLLECT_PADS_STREAM_UNLOCK (pads);
/* we must not forward this event since multiple segments will be
* accumulated and this is certainly not what we want. */
goto eat;
}
case GST_EVENT_GAP:
{
GstClockTime start, duration;
GST_COLLECT_PADS_STREAM_LOCK (pads);
gst_event_parse_gap (event, &start, &duration);
/* FIXME, handle reverse playback case */
if (GST_CLOCK_TIME_IS_VALID (duration))
start += duration;
/* we do not expect another buffer until after gap,
* so that is our position now */
data->segment.position = gst_collect_pads_clip_time (pads, data, start);
gst_collect_pads_handle_position_update (pads, data,
data->segment.position);
GST_COLLECT_PADS_STREAM_UNLOCK (pads);
goto eat;
}
case GST_EVENT_STREAM_START:
/* drop stream start events, element must create its own start event,
* we can't just forward the first random stream start event we get */
goto eat;
case GST_EVENT_CAPS:
goto eat;
default:
/* forward other events */
goto forward;
}
eat:
if (event)
gst_event_unref (event);
return res;
forward:
if (discard)
goto eat;
else
return gst_pad_event_default (pad, parent, event);
}
typedef struct
{
GstEvent *event;
gboolean result;
} EventData;
static gboolean
event_forward_func (GstPad * pad, EventData * data)
{
data->result &= gst_pad_push_event (pad, gst_event_ref (data->event));
/* Always send to all pads */
return FALSE;
}
static gboolean
forward_event_to_all_sinkpads (GstPad * srcpad, GstEvent * event)
{
EventData data;
data.event = event;
data.result = TRUE;
gst_pad_forward (srcpad, (GstPadForwardFunction) event_forward_func, &data);
gst_event_unref (event);
return data.result;
}
/**
* gst_collect_pads_src_event_default:
* @pads: the collectpads to use
* @pad: src #GstPad that received the event
* @event: event being processed
*
* Default GstCollectPads event handling for the src pad of elements.
* Elements can chain up to this to let flushing seek event handling
* be done by GstCollectPads.
*
* Since: 1.4
*/
gboolean
gst_collect_pads_src_event_default (GstCollectPads * pads, GstPad * pad,
GstEvent * event)
{
GstObject *parent;
gboolean res = TRUE;
parent = GST_OBJECT_PARENT (pad);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:{
GstSeekFlags flags;
GST_INFO_OBJECT (pads, "starting seek");
gst_event_parse_seek (event, NULL, NULL, &flags, NULL, NULL, NULL, NULL);
if (flags & GST_SEEK_FLAG_FLUSH) {
g_atomic_int_set (&pads->priv->seeking, TRUE);
g_atomic_int_set (&pads->priv->pending_flush_start, TRUE);
/* forward the seek upstream */
res = forward_event_to_all_sinkpads (pad, event);
event = NULL;
if (!res) {
g_atomic_int_set (&pads->priv->seeking, FALSE);
g_atomic_int_set (&pads->priv->pending_flush_start, FALSE);
}
}
GST_INFO_OBJECT (pads, "seek done, result: %d", res);
break;
}
default:
break;
}
if (event)
res = gst_pad_event_default (pad, parent, event);
return res;
}
static gboolean
gst_collect_pads_event_default_internal (GstCollectPads * pads,
GstCollectData * data, GstEvent * event, gpointer user_data)
{
return gst_collect_pads_event_default (pads, data, event, FALSE);
}
static gboolean
gst_collect_pads_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean res = FALSE, need_unlock = FALSE;
GstCollectData *data;
GstCollectPads *pads;
GstCollectPadsEventFunction event_func;
gpointer event_user_data;
/* some magic to get the managing collect_pads */
GST_OBJECT_LOCK (pad);
data = (GstCollectData *) gst_pad_get_element_private (pad);
if (G_UNLIKELY (data == NULL))
goto pad_removed;
ref_data (data);
GST_OBJECT_UNLOCK (pad);
res = FALSE;
pads = data->collect;
GST_DEBUG_OBJECT (data->pad, "Got %s event on sink pad",
GST_EVENT_TYPE_NAME (event));
GST_OBJECT_LOCK (pads);
event_func = pads->priv->event_func;
event_user_data = pads->priv->event_user_data;
GST_OBJECT_UNLOCK (pads);
if (GST_EVENT_IS_SERIALIZED (event)) {
GST_COLLECT_PADS_STREAM_LOCK (pads);
need_unlock = TRUE;
}
if (G_LIKELY (event_func)) {
res = event_func (pads, data, event, event_user_data);
}
if (need_unlock)
GST_COLLECT_PADS_STREAM_UNLOCK (pads);
unref_data (data);
return res;
/* ERRORS */
pad_removed:
{
GST_DEBUG ("%s got removed from collectpads", GST_OBJECT_NAME (pad));
GST_OBJECT_UNLOCK (pad);
return FALSE;
}
}
/**
* gst_collect_pads_query_default:
* @pads: the collectpads to use
* @data: collect data of corresponding pad
* @query: query being processed
* @discard: process but do not send event downstream
*
* Default GstCollectPads query handling that elements should always
* chain up to to ensure proper operation. Element might however indicate
* query should not be forwarded downstream.
*/
gboolean
gst_collect_pads_query_default (GstCollectPads * pads, GstCollectData * data,
GstQuery * query, gboolean discard)
{
gboolean res = TRUE;
GstObject *parent;
GstPad *pad;
pad = data->pad;
parent = GST_OBJECT_PARENT (pad);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_SEEKING:
{
GstFormat format;
/* don't pass it along as some (file)sink might claim it does
* whereas with a collectpads in between that will not likely work */
gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
gst_query_set_seeking (query, format, FALSE, 0, -1);
res = TRUE;
discard = TRUE;
break;
}
default:
break;
}
if (!discard)
return gst_pad_query_default (pad, parent, query);
else
return res;
}
static gboolean
gst_collect_pads_query_default_internal (GstCollectPads * pads,
GstCollectData * data, GstQuery * query, gpointer user_data)
{
return gst_collect_pads_query_default (pads, data, query, FALSE);
}
static gboolean
gst_collect_pads_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
gboolean res = FALSE, need_unlock = FALSE;
GstCollectData *data;
GstCollectPads *pads;
GstCollectPadsQueryFunction query_func;
gpointer query_user_data;
GST_DEBUG_OBJECT (pad, "Got %s query on sink pad",
GST_QUERY_TYPE_NAME (query));
/* some magic to get the managing collect_pads */
GST_OBJECT_LOCK (pad);
data = (GstCollectData *) gst_pad_get_element_private (pad);
if (G_UNLIKELY (data == NULL))
goto pad_removed;
ref_data (data);
GST_OBJECT_UNLOCK (pad);
pads = data->collect;
GST_OBJECT_LOCK (pads);
query_func = pads->priv->query_func;
query_user_data = pads->priv->query_user_data;
GST_OBJECT_UNLOCK (pads);
if (GST_QUERY_IS_SERIALIZED (query)) {
GST_COLLECT_PADS_STREAM_LOCK (pads);
need_unlock = TRUE;
}
if (G_LIKELY (query_func)) {
res = query_func (pads, data, query, query_user_data);
}
if (need_unlock)
GST_COLLECT_PADS_STREAM_UNLOCK (pads);
unref_data (data);
return res;
/* ERRORS */
pad_removed:
{
GST_DEBUG ("%s got removed from collectpads", GST_OBJECT_NAME (pad));
GST_OBJECT_UNLOCK (pad);
return FALSE;
}
}
/* For each buffer we receive we check if our collected condition is reached
* and if so we call the collected function. When this is done we check if
* data has been unqueued. If data is still queued we wait holding the stream
* lock to make sure no EOS event can happen while we are ready to be
* collected
*/
static GstFlowReturn
gst_collect_pads_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstCollectData *data;
GstCollectPads *pads;
GstFlowReturn ret;
GstBuffer **buffer_p;
guint32 cookie;
GST_DEBUG ("Got buffer for pad %s:%s", GST_DEBUG_PAD_NAME (pad));
/* some magic to get the managing collect_pads */
GST_OBJECT_LOCK (pad);
data = (GstCollectData *) gst_pad_get_element_private (pad);
if (G_UNLIKELY (data == NULL))
goto no_data;
ref_data (data);
GST_OBJECT_UNLOCK (pad);
pads = data->collect;
GST_COLLECT_PADS_STREAM_LOCK (pads);
/* if not started, bail out */
if (G_UNLIKELY (!pads->priv->started))
goto not_started;
/* check if this pad is flushing */
if (G_UNLIKELY (GST_COLLECT_PADS_STATE_IS_SET (data,
GST_COLLECT_PADS_STATE_FLUSHING)))
goto flushing;
/* pad was EOS, we can refuse this data */
if (G_UNLIKELY (GST_COLLECT_PADS_STATE_IS_SET (data,
GST_COLLECT_PADS_STATE_EOS)))
goto eos;
/* see if we need to clip */
if (pads->priv->clip_func) {
GstBuffer *outbuf = NULL;
ret =
pads->priv->clip_func (pads, data, buffer, &outbuf,
pads->priv->clip_user_data);
buffer = outbuf;
if (G_UNLIKELY (outbuf == NULL))
goto clipped;
if (G_UNLIKELY (ret == GST_FLOW_EOS))
goto eos;
else if (G_UNLIKELY (ret != GST_FLOW_OK))
goto error;
}
GST_DEBUG_OBJECT (pads, "Queuing buffer %p for pad %s:%s", buffer,
GST_DEBUG_PAD_NAME (pad));
/* One more pad has data queued */
if (GST_COLLECT_PADS_STATE_IS_SET (data, GST_COLLECT_PADS_STATE_WAITING))
pads->priv->queuedpads++;
buffer_p = &data->buffer;
gst_buffer_replace (buffer_p, buffer);
/* update segment last position if in TIME */
if (G_LIKELY (data->segment.format == GST_FORMAT_TIME)) {
GstClockTime timestamp;
timestamp = GST_BUFFER_DTS (buffer);
if (!GST_CLOCK_TIME_IS_VALID (timestamp))
timestamp = GST_BUFFER_PTS (buffer);
if (GST_CLOCK_TIME_IS_VALID (timestamp))
data->segment.position = timestamp;
}
/* While we have data queued on this pad try to collect stuff */
do {
/* Check if our collected condition is matched and call the collected
* function if it is */
ret = gst_collect_pads_check_collected (pads);
/* when an error occurs, we want to report this back to the caller ASAP
* without having to block if the buffer was not popped */
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto error;
/* data was consumed, we can exit and accept new data */
if (data->buffer == NULL)
break;
/* Having the _INIT here means we don't care about any broadcast up to here
* (most of which occur with STREAM_LOCK held, so could not have happened
* anyway). We do care about e.g. a remove initiated broadcast as of this
* point. Putting it here also makes this thread ignores any evt it raised
* itself (as is a usual WAIT semantic).
*/
GST_COLLECT_PADS_EVT_INIT (cookie);
/* pad could be removed and re-added */
unref_data (data);
GST_OBJECT_LOCK (pad);
if (G_UNLIKELY ((data = gst_pad_get_element_private (pad)) == NULL))
goto pad_removed;
ref_data (data);
GST_OBJECT_UNLOCK (pad);
GST_DEBUG_OBJECT (pads, "Pad %s:%s has a buffer queued, waiting",
GST_DEBUG_PAD_NAME (pad));
/* wait to be collected, this must happen from another thread triggered
* by the _chain function of another pad. We release the lock so we
* can get stopped or flushed as well. We can however not get EOS
* because we still hold the STREAM_LOCK.
*/
GST_COLLECT_PADS_STREAM_UNLOCK (pads);
GST_COLLECT_PADS_EVT_WAIT (pads, cookie);
GST_COLLECT_PADS_STREAM_LOCK (pads);
GST_DEBUG_OBJECT (pads, "Pad %s:%s resuming", GST_DEBUG_PAD_NAME (pad));
/* after a signal, we could be stopped */
if (G_UNLIKELY (!pads->priv->started))
goto not_started;
/* check if this pad is flushing */
if (G_UNLIKELY (GST_COLLECT_PADS_STATE_IS_SET (data,
GST_COLLECT_PADS_STATE_FLUSHING)))
goto flushing;
}
while (data->buffer != NULL);
unlock_done:
GST_COLLECT_PADS_STREAM_UNLOCK (pads);
/* data is definitely NULL if pad_removed goto was run. */
if (data)
unref_data (data);
if (buffer)
gst_buffer_unref (buffer);
return ret;
pad_removed:
{
GST_WARNING ("%s got removed from collectpads", GST_OBJECT_NAME (pad));
GST_OBJECT_UNLOCK (pad);
ret = GST_FLOW_NOT_LINKED;
goto unlock_done;
}
/* ERRORS */
no_data:
{
GST_DEBUG ("%s got removed from collectpads", GST_OBJECT_NAME (pad));
GST_OBJECT_UNLOCK (pad);
gst_buffer_unref (buffer);
return GST_FLOW_NOT_LINKED;
}
not_started:
{
GST_DEBUG ("not started");
gst_collect_pads_clear (pads, data);
ret = GST_FLOW_FLUSHING;
goto unlock_done;
}
flushing:
{
GST_DEBUG ("pad %s:%s is flushing", GST_DEBUG_PAD_NAME (pad));
gst_collect_pads_clear (pads, data);
ret = GST_FLOW_FLUSHING;
goto unlock_done;
}
eos:
{
/* we should not post an error for this, just inform upstream that
* we don't expect anything anymore */
GST_DEBUG ("pad %s:%s is eos", GST_DEBUG_PAD_NAME (pad));
ret = GST_FLOW_EOS;
goto unlock_done;
}
clipped:
{
GST_DEBUG ("clipped buffer on pad %s:%s", GST_DEBUG_PAD_NAME (pad));
ret = GST_FLOW_OK;
goto unlock_done;
}
error:
{
/* we print the error, the element should post a reasonable error
* message for fatal errors */
GST_DEBUG ("collect failed, reason %d (%s)", ret, gst_flow_get_name (ret));
gst_collect_pads_clear (pads, data);
goto unlock_done;
}
}
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