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gstreamer/libs/gst/base/gstcollectpads2.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>
*
* gstcollectpads2.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:gstcollectpads2
* @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_pads2_new(). A callback should then
* be installed with gst_collect_pads2_set_function ().
* </para></listitem>
* <listitem><para>
* Pads are added to the collection with gst_collect_pads2_add_pad()/
* gst_collect_pads2_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_pads2_pop() method.
* One can peek at the data with the gst_collect_pads2_peek() function.
* These functions will return NULL if the pad received an EOS event. When all
* pads return NULL from a gst_collect_pads2_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_pads2_available(),
* gst_collect_pads2_read() and gst_collect_pads2_flush() calls.
* </para></listitem>
* <listitem><para>
* Elements should call gst_collect_pads2_start() and gst_collect_pads2_stop() in
* their state change functions to start and stop the processing of the collectpads.
* The gst_collect_pads2_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_pads2_collect() and gst_collect_pads2_collect_range() can be used by
* elements that start a #GstTask to drive the collect_pads2. This feature is however
* not yet implemented.
* </para></listitem>
* <listitem><para>
* gst_collect_pads2_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)
*
* Since: 0.10.36
*/
#include "gstcollectpads2.h"
GST_DEBUG_CATEGORY_STATIC (collect_pads2_debug);
#define GST_CAT_DEFAULT collect_pads2_debug
#define parent_class gst_collect_pads2_parent_class
G_DEFINE_TYPE (GstCollectPads2, gst_collect_pads2, GST_TYPE_OBJECT);
static void gst_collect_pads2_clear (GstCollectPads2 * pads,
GstCollectData2 * data);
static GstFlowReturn gst_collect_pads2_chain (GstPad * pad, GstBuffer * buffer);
static gboolean gst_collect_pads2_event (GstPad * pad, GstEvent * event);
static void gst_collect_pads2_finalize (GObject * object);
static GstFlowReturn gst_collect_pads2_default_collected (GstCollectPads2 *
pads, gpointer user_data);
static gint gst_collect_pads2_default_compare_func (GstCollectPads2 * pads,
GstCollectData2 * data1, GstClockTime timestamp1, GstCollectData2 * data2,
GstClockTime timestamp2, gpointer user_data);
static gboolean gst_collect_pads2_recalculate_full (GstCollectPads2 * pads);
static void ref_data (GstCollectData2 * data);
static void unref_data (GstCollectData2 * 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_PADS2_GET_EVT_COND(pads) (((GstCollectPads2 *)pads)->evt_cond)
#define GST_COLLECT_PADS2_GET_EVT_LOCK(pads) (((GstCollectPads2 *)pads)->evt_lock)
#define GST_COLLECT_PADS2_EVT_WAIT(pads, cookie) G_STMT_START { \
g_mutex_lock (GST_COLLECT_PADS2_GET_EVT_LOCK (pads)); \
/* should work unless a lot of event'ing and thread starvation */\
while (cookie == ((GstCollectPads2 *) pads)->evt_cookie) \
g_cond_wait (GST_COLLECT_PADS2_GET_EVT_COND (pads), \
GST_COLLECT_PADS2_GET_EVT_LOCK (pads)); \
cookie = ((GstCollectPads2 *) pads)->evt_cookie; \
g_mutex_unlock (GST_COLLECT_PADS2_GET_EVT_LOCK (pads)); \
} G_STMT_END
#define GST_COLLECT_PADS2_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_PADS2_GET_EVT_LOCK (pads)); \
/* should work unless a lot of event'ing and thread starvation */\
while (cookie == ((GstCollectPads2 *) pads)->evt_cookie) \
g_cond_timed_wait (GST_COLLECT_PADS2_GET_EVT_COND (pads), \
GST_COLLECT_PADS2_GET_EVT_LOCK (pads), &tv); \
cookie = ((GstCollectPads2 *) pads)->evt_cookie; \
g_mutex_unlock (GST_COLLECT_PADS2_GET_EVT_LOCK (pads)); \
} G_STMT_END
#define GST_COLLECT_PADS2_EVT_BROADCAST(pads) G_STMT_START { \
g_mutex_lock (GST_COLLECT_PADS2_GET_EVT_LOCK (pads)); \
/* never mind wrap-around */ \
++(((GstCollectPads2 *) pads)->evt_cookie); \
g_cond_broadcast (GST_COLLECT_PADS2_GET_EVT_COND (pads)); \
g_mutex_unlock (GST_COLLECT_PADS2_GET_EVT_LOCK (pads)); \
} G_STMT_END
#define GST_COLLECT_PADS2_EVT_INIT(cookie) G_STMT_START { \
g_mutex_lock (GST_COLLECT_PADS2_GET_EVT_LOCK (pads)); \
cookie = ((GstCollectPads2 *) pads)->evt_cookie; \
g_mutex_unlock (GST_COLLECT_PADS2_GET_EVT_LOCK (pads)); \
} G_STMT_END
static void
gst_collect_pads2_class_init (GstCollectPads2Class * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GST_DEBUG_CATEGORY_INIT (collect_pads2_debug, "collectpads2", 0,
"GstCollectPads2");
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_collect_pads2_finalize);
}
static void
gst_collect_pads2_init (GstCollectPads2 * pads)
{
pads->data = NULL;
pads->cookie = 0;
pads->numpads = 0;
pads->queuedpads = 0;
pads->eospads = 0;
pads->started = FALSE;
g_static_rec_mutex_init (&pads->stream_lock);
pads->func = gst_collect_pads2_default_collected;
pads->user_data = NULL;
pads->event_func = NULL;
pads->event_user_data = NULL;
/* members for default muxing */
pads->buffer_func = NULL;
pads->buffer_user_data = NULL;
pads->compare_func = gst_collect_pads2_default_compare_func;
pads->compare_user_data = NULL;
pads->earliest_data = NULL;
pads->earliest_time = GST_CLOCK_TIME_NONE;
/* members to manage the pad list */
pads->pad_cookie = 0;
pads->pad_list = NULL;
/* members for event */
pads->evt_lock = g_mutex_new ();
pads->evt_cond = g_cond_new ();
pads->evt_cookie = 0;
}
static void
gst_collect_pads2_finalize (GObject * object)
{
GstCollectPads2 *pads = GST_COLLECT_PADS2 (object);
GST_DEBUG_OBJECT (object, "finalize");
g_static_rec_mutex_free (&pads->stream_lock);
g_cond_free (pads->evt_cond);
g_mutex_free (pads->evt_lock);
/* Remove pads and free pads list */
g_slist_foreach (pads->pad_list, (GFunc) unref_data, NULL);
g_slist_foreach (pads->data, (GFunc) unref_data, NULL);
g_slist_free (pads->data);
g_slist_free (pads->pad_list);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/**
* gst_collect_pads2_new:
*
* Create a new instance of #GstCollectsPads.
*
* Returns: a new #GstCollectPads2, or NULL in case of an error.
*
* MT safe.
*
* Since: 0.10.36
*/
GstCollectPads2 *
gst_collect_pads2_new (void)
{
GstCollectPads2 *newcoll;
newcoll = g_object_new (GST_TYPE_COLLECT_PADS2, NULL);
return newcoll;
}
/* Must be called with GstObject lock! */
static void
gst_collect_pads2_set_buffer_function_locked (GstCollectPads2 * pads,
GstCollectPads2BufferFunction func, gpointer user_data)
{
pads->buffer_func = func;
pads->buffer_user_data = user_data;
}
/**
* gst_collect_pads2_set_buffer_function:
* @pads: the collectpads to use
* @func: the function to set
* @user_data: 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.
*
* MT safe.
*
* Since: 0.10.36
*/
void
gst_collect_pads2_set_buffer_function (GstCollectPads2 * pads,
GstCollectPads2BufferFunction func, gpointer user_data)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS2 (pads));
GST_OBJECT_LOCK (pads);
gst_collect_pads2_set_buffer_function_locked (pads, func, user_data);
GST_OBJECT_UNLOCK (pads);
}
/**
* gst_collect_pads2_set_compare_function:
* @pads: the pads to use
* @func: the function to set
* @user_data: user data passed to the function
*
* Set the timestamp comparison function.
*
* MT safe.
*
* Since: 0.10.36
*/
/* 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_pads2_set_compare_function (GstCollectPads2 * pads,
GstCollectPads2CompareFunction func, gpointer user_data)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS2 (pads));
GST_OBJECT_LOCK (pads);
pads->compare_func = func;
pads->compare_user_data = user_data;
GST_OBJECT_UNLOCK (pads);
}
/**
* gst_collect_pads2_set_function:
* @pads: the collectspads 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_pads2_set_buffer_function() callback.
* If this callback is set, the former will be unset.
*
* MT safe.
*
* Since: 0.10.36
*/
void
gst_collect_pads2_set_function (GstCollectPads2 * pads,
GstCollectPads2Function func, gpointer user_data)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS2 (pads));
GST_OBJECT_LOCK (pads);
pads->func = func;
pads->user_data = user_data;
gst_collect_pads2_set_buffer_function_locked (pads, NULL, NULL);
GST_OBJECT_UNLOCK (pads);
}
static void
ref_data (GstCollectData2 * data)
{
g_assert (data != NULL);
g_atomic_int_inc (&(data->refcount));
}
static void
unref_data (GstCollectData2 * data)
{
g_assert (data != NULL);
g_assert (data->refcount > 0);
if (!g_atomic_int_dec_and_test (&(data->refcount)))
return;
if (data->destroy_notify)
data->destroy_notify (data);
g_object_unref (data->pad);
if (data->buffer) {
gst_buffer_unref (data->buffer);
}
g_free (data);
}
/**
* gst_collect_pads2_set_event_function:
* @pads: the collectspads 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 after
* collectpads has processed and 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.
*
* Since: 0.10.36
*/
void
gst_collect_pads2_set_event_function (GstCollectPads2 * pads,
GstCollectPads2EventFunction func, gpointer user_data)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS2 (pads));
GST_OBJECT_LOCK (pads);
pads->event_func = func;
pads->event_user_data = user_data;
GST_OBJECT_UNLOCK (pads);
}
/**
* gst_collect_pads2_set_clip_function:
* @pads: the collectspads 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 #GstCollectPad2ClipFunction for more info.
*
* Since: 0.10.36
*/
void
gst_collect_pads2_set_clip_function (GstCollectPads2 * pads,
GstCollectPads2ClipFunction clipfunc, gpointer user_data)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS2 (pads));
pads->clip_func = clipfunc;
pads->clip_user_data = user_data;
}
/**
* gst_collect_pads2_add_pad:
* @pads: the collectspads to use
* @pad: the pad to add
* @size: the size of the returned #GstCollectData2 structure
*
* 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_pads2_remove_pad() to remove the pad from the collection
* again.
*
* You specify a size for the returned #GstCollectData2 structure
* so that you can use it to store additional information.
*
* The pad will be automatically activated in push mode when @pads is
* started.
*
* This function calls gst_collect_pads2_add_pad() passing a value of NULL
* for destroy_notify and TRUE for locked.
*
* Returns: a new #GstCollectData2 to identify the new pad. Or NULL
* if wrong parameters are supplied.
*
* MT safe.
*
* Since: 0.10.36
*/
GstCollectData2 *
gst_collect_pads2_add_pad (GstCollectPads2 * pads, GstPad * pad, guint size)
{
return gst_collect_pads2_add_pad_full (pads, pad, size, NULL, TRUE);
}
/**
* gst_collect_pads2_add_pad_full:
* @pads: the collectspads to use
* @pad: the pad to add
* @size: the size of the returned #GstCollectData2 structure
* @destroy_notify: function to be called before the returned #GstCollectData2
* 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_pads2_remove_pad() to remove the pad from the collection
* again.
*
* You specify a size for the returned #GstCollectData2 structure
* so that you can use it to store additional information.
*
* You can also specify a #GstCollectData2DestroyNotify that will be called
* just before the #GstCollectData2 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.
*
* Since: 0.10.36
*
* Returns: a new #GstCollectData2 to identify the new pad. Or NULL
* if wrong parameters are supplied.
*
* MT safe.
*/
GstCollectData2 *
gst_collect_pads2_add_pad_full (GstCollectPads2 * pads, GstPad * pad,
guint size, GstCollectData2DestroyNotify destroy_notify, gboolean lock)
{
GstCollectData2 *data;
g_return_val_if_fail (pads != NULL, NULL);
g_return_val_if_fail (GST_IS_COLLECT_PADS2 (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 (GstCollectData2), NULL);
GST_DEBUG_OBJECT (pads, "adding pad %s:%s", GST_DEBUG_PAD_NAME (pad));
data = g_malloc0 (size);
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_PADS2_STATE_WAITING;
data->state |= lock ? GST_COLLECT_PADS2_STATE_LOCKED : 0;
data->refcount = 1;
data->destroy_notify = destroy_notify;
GST_OBJECT_LOCK (pads);
GST_OBJECT_LOCK (pad);
gst_pad_set_element_private (pad, data);
GST_OBJECT_UNLOCK (pad);
pads->pad_list = g_slist_append (pads->pad_list, data);
gst_pad_set_chain_function (pad, GST_DEBUG_FUNCPTR (gst_collect_pads2_chain));
gst_pad_set_event_function (pad, GST_DEBUG_FUNCPTR (gst_collect_pads2_event));
/* 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->started) {
pads->data = g_slist_append (pads->data, data);
ref_data (data);
}
/* activate the pad when needed */
if (pads->started)
gst_pad_set_active (pad, TRUE);
pads->pad_cookie++;
GST_OBJECT_UNLOCK (pads);
return data;
}
static gint
find_pad (GstCollectData2 * data, GstPad * pad)
{
if (data->pad == pad)
return 0;
return 1;
}
/**
* gst_collect_pads2_remove_pad:
* @pads: the collectspads to use
* @pad: the pad to remove
*
* Remove a pad from the collection of collect pads. This function will also
* free the #GstCollectData2 and all the resources that were allocated with
* gst_collect_pads2_add_pad().
*
* The pad will be deactivated automatically when @pads is stopped.
*
* Returns: %TRUE if the pad could be removed.
*
* MT safe.
*
* Since: 0.10.36
*/
gboolean
gst_collect_pads2_remove_pad (GstCollectPads2 * pads, GstPad * pad)
{
GstCollectData2 *data;
GSList *list;
g_return_val_if_fail (pads != NULL, FALSE);
g_return_val_if_fail (GST_IS_COLLECT_PADS2 (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->pad_list, pad, (GCompareFunc) find_pad);
if (!list)
goto unknown_pad;
data = (GstCollectData2 *) 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->started) {
GSList *dlist;
dlist = g_slist_find_custom (pads->data, pad, (GCompareFunc) find_pad);
if (dlist) {
GstCollectData2 *pdata = dlist->data;
pads->data = g_slist_delete_link (pads->data, dlist);
unref_data (pdata);
}
}
/* remove from the pad list */
pads->pad_list = g_slist_delete_link (pads->pad_list, list);
pads->pad_cookie++;
/* signal waiters because something changed */
GST_COLLECT_PADS2_EVT_BROADCAST (pads);
/* deactivate the pad when needed */
if (!pads->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;
}
}
/**
* gst_collect_pads2_is_active:
* @pads: the collectspads to use
* @pad: the pad to check
*
* Check if a pad is active.
*
* This function is currently not implemented.
*
* Returns: %TRUE if the pad is active.
*
* MT safe.
*
* Since: 0.10.36
*/
gboolean
gst_collect_pads2_is_active (GstCollectPads2 * pads, GstPad * pad)
{
g_return_val_if_fail (pads != NULL, FALSE);
g_return_val_if_fail (GST_IS_COLLECT_PADS2 (pads), FALSE);
g_return_val_if_fail (pad != NULL, FALSE);
g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
g_warning ("gst_collect_pads2_is_active() is not implemented");
return FALSE;
}
/**
* gst_collect_pads2_collect:
* @pads: the collectspads to use
*
* Collect data on all pads. This function is usually called
* from a #GstTask function in an element.
*
* This function is currently not implemented.
*
* Returns: #GstFlowReturn of the operation.
*
* MT safe.
*
* Since: 0.10.36
*/
GstFlowReturn
gst_collect_pads2_collect (GstCollectPads2 * pads)
{
g_return_val_if_fail (pads != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (GST_IS_COLLECT_PADS2 (pads), GST_FLOW_ERROR);
g_warning ("gst_collect_pads2_collect() is not implemented");
return GST_FLOW_NOT_SUPPORTED;
}
/**
* gst_collect_pads2_collect_range:
* @pads: the collectspads to use
* @offset: the offset to collect
* @length: the length to collect
*
* Collect data with @offset and @length on all pads. This function
* is typically called in the getrange function of an element.
*
* This function is currently not implemented.
*
* Returns: #GstFlowReturn of the operation.
*
* MT safe.
*
* Since: 0.10.36
*/
GstFlowReturn
gst_collect_pads2_collect_range (GstCollectPads2 * pads, guint64 offset,
guint length)
{
g_return_val_if_fail (pads != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (GST_IS_COLLECT_PADS2 (pads), GST_FLOW_ERROR);
g_warning ("gst_collect_pads2_collect_range() is not implemented");
return GST_FLOW_NOT_SUPPORTED;
}
/*
* Must be called with STREAM_LOCK.
*/
static void
gst_collect_pads2_set_flushing_unlocked (GstCollectPads2 * pads,
gboolean flushing)
{
GSList *walk = NULL;
/* Update the pads flushing flag */
for (walk = pads->data; walk; walk = g_slist_next (walk)) {
GstCollectData2 *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_PADS2_STATE_SET (cdata, GST_COLLECT_PADS2_STATE_FLUSHING);
else
GST_COLLECT_PADS2_STATE_UNSET (cdata, GST_COLLECT_PADS2_STATE_FLUSHING);
gst_collect_pads2_clear (pads, cdata);
GST_OBJECT_UNLOCK (cdata->pad);
}
}
/* inform _chain of changes */
GST_COLLECT_PADS2_EVT_BROADCAST (pads);
}
/**
* gst_collect_pads2_set_flushing:
* @pads: the collectspads 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.
*
*
* Since: 0.10.36
*/
void
gst_collect_pads2_set_flushing (GstCollectPads2 * pads, gboolean flushing)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS2 (pads));
/* NOTE since this eventually calls _pop, some (STREAM_)LOCK is needed here */
GST_COLLECT_PADS2_STREAM_LOCK (pads);
gst_collect_pads2_set_flushing_unlocked (pads, flushing);
GST_COLLECT_PADS2_STREAM_UNLOCK (pads);
}
/**
* gst_collect_pads2_start:
* @pads: the collectspads to use
*
* Starts the processing of data in the collect_pads2.
*
* MT safe.
*
* Since: 0.10.36
*/
void
gst_collect_pads2_start (GstCollectPads2 * pads)
{
GSList *collected;
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS2 (pads));
GST_DEBUG_OBJECT (pads, "starting collect pads");
/* make sure stop and collect cannot be called anymore */
GST_COLLECT_PADS2_STREAM_LOCK (pads);
/* make pads streamable */
GST_OBJECT_LOCK (pads);
/* loop over the master pad list and reset the segment */
collected = pads->pad_list;
for (; collected; collected = g_slist_next (collected)) {
GstCollectData2 *data;
data = collected->data;
gst_segment_init (&data->segment, GST_FORMAT_UNDEFINED);
}
gst_collect_pads2_set_flushing_unlocked (pads, FALSE);
/* Start collect pads */
pads->started = TRUE;
GST_OBJECT_UNLOCK (pads);
GST_COLLECT_PADS2_STREAM_UNLOCK (pads);
}
/**
* gst_collect_pads2_stop:
* @pads: the collectspads to use
*
* Stops the processing of data in the collect_pads2. this function
* will also unblock any blocking operations.
*
* MT safe.
*
* Since: 0.10.36
*/
void
gst_collect_pads2_stop (GstCollectPads2 * pads)
{
GSList *collected;
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS2 (pads));
GST_DEBUG_OBJECT (pads, "stopping collect pads");
/* make sure collect and start cannot be called anymore */
GST_COLLECT_PADS2_STREAM_LOCK (pads);
/* make pads not accept data anymore */
GST_OBJECT_LOCK (pads);
gst_collect_pads2_set_flushing_unlocked (pads, TRUE);
/* Stop collect pads */
pads->started = FALSE;
pads->eospads = 0;
pads->queuedpads = 0;
/* loop over the master pad list and flush buffers */
collected = pads->pad_list;
for (; collected; collected = g_slist_next (collected)) {
GstCollectData2 *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_PADS2_STATE_UNSET (data, GST_COLLECT_PADS2_STATE_EOS);
}
if (pads->earliest_data)
unref_data (pads->earliest_data);
pads->earliest_data = NULL;
pads->earliest_time = GST_CLOCK_TIME_NONE;
GST_OBJECT_UNLOCK (pads);
/* Wake them up so they can end the chain functions. */
GST_COLLECT_PADS2_EVT_BROADCAST (pads);
GST_COLLECT_PADS2_STREAM_UNLOCK (pads);
}
/**
* gst_collect_pads2_peek:
* @pads: the collectspads 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.
*
* Returns: The buffer in @data or NULL if no buffer is queued.
* should unref the buffer after usage.
*
* MT safe.
*
* Since: 0.10.36
*/
GstBuffer *
gst_collect_pads2_peek (GstCollectPads2 * pads, GstCollectData2 * data)
{
GstBuffer *result;
g_return_val_if_fail (pads != NULL, NULL);
g_return_val_if_fail (GST_IS_COLLECT_PADS2 (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_pads2_pop:
* @pads: the collectspads 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.
*
* Returns: The buffer in @data or NULL if no buffer was queued.
* You should unref the buffer after usage.
*
* MT safe.
*
* Since: 0.10.36
*/
GstBuffer *
gst_collect_pads2_pop (GstCollectPads2 * pads, GstCollectData2 * data)
{
GstBuffer *result;
g_return_val_if_fail (pads != NULL, NULL);
g_return_val_if_fail (GST_IS_COLLECT_PADS2 (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_PADS2_STATE_IS_SET (data, GST_COLLECT_PADS2_STATE_WAITING))
pads->queuedpads--;
}
GST_COLLECT_PADS2_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_pads2_clear (GstCollectPads2 * pads, GstCollectData2 * data)
{
GstBuffer *buf;
if ((buf = gst_collect_pads2_pop (pads, data)))
gst_buffer_unref (buf);
}
/**
* gst_collect_pads2_available:
* @pads: the collectspads 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.
*
* Returns: The maximum number of bytes queued on all pads. This function
* returns 0 if a pad has no queued buffer.
*
* MT safe.
*
* Since: 0.10.36
*/
/* 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_pads2_available (GstCollectPads2 * pads)
{
GSList *collected;
guint result = G_MAXUINT;
g_return_val_if_fail (pads != NULL, 0);
g_return_val_if_fail (GST_IS_COLLECT_PADS2 (pads), 0);
collected = pads->data;
for (; collected; collected = g_slist_next (collected)) {
GstCollectData2 *pdata;
GstBuffer *buffer;
gint size;
pdata = (GstCollectData2 *) collected->data;
/* ignore pad with EOS */
if (G_UNLIKELY (GST_COLLECT_PADS2_STATE_IS_SET (pdata,
GST_COLLECT_PADS2_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_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_pads2_read:
* @pads: the collectspads to query
* @data: the data to use
* @bytes: a pointer to a byte array
* @size: the number of bytes to read
*
* Get a pointer in @bytes where @size bytes can be read from the
* given pad data.
*
* This function should be called with @pads STREAM_LOCK held, such as
* in the callback.
*
* Returns: The number of bytes available for consumption in the
* memory pointed to by @bytes. This can be less than @size and
* is 0 if the pad is end-of-stream.
*
* MT safe.
*
* Since: 0.10.36
*/
guint
gst_collect_pads2_read (GstCollectPads2 * pads, GstCollectData2 * data,
guint8 ** bytes, guint size)
{
guint readsize;
GstBuffer *buffer;
g_return_val_if_fail (pads != NULL, 0);
g_return_val_if_fail (GST_IS_COLLECT_PADS2 (pads), 0);
g_return_val_if_fail (data != NULL, 0);
g_return_val_if_fail (bytes != NULL, 0);
/* no buffer, must be EOS */
if ((buffer = data->buffer) == NULL)
return 0;
readsize = MIN (size, GST_BUFFER_SIZE (buffer) - data->pos);
*bytes = GST_BUFFER_DATA (buffer) + data->pos;
return readsize;
}
/**
* gst_collect_pads2_flush:
* @pads: the collectspads 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.
*
* Returns: The number of bytes flushed This can be less than @size and
* is 0 if the pad was end-of-stream.
*
* MT safe.
*
* Since: 0.10.36
*/
guint
gst_collect_pads2_flush (GstCollectPads2 * pads, GstCollectData2 * data,
guint size)
{
guint flushsize;
GstBuffer *buffer;
g_return_val_if_fail (pads != NULL, 0);
g_return_val_if_fail (GST_IS_COLLECT_PADS2 (pads), 0);
g_return_val_if_fail (data != NULL, 0);
/* no buffer, must be EOS */
if ((buffer = data->buffer) == NULL)
return 0;
/* this is what we can flush at max */
flushsize = MIN (size, GST_BUFFER_SIZE (buffer) - data->pos);
data->pos += size;
if (data->pos >= GST_BUFFER_SIZE (buffer))
/* _clear will also reset data->pos to 0 */
gst_collect_pads2_clear (pads, data);
return flushsize;
}
/**
* gst_collect_pads2_read_buffer:
* @pads: the collectspads 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.
*
* Since: 0.10.36
*
* 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.
*
* MT safe.
*/
GstBuffer *
gst_collect_pads2_read_buffer (GstCollectPads2 * pads, GstCollectData2 * data,
guint size)
{
guint readsize;
GstBuffer *buffer;
g_return_val_if_fail (pads != NULL, NULL);
g_return_val_if_fail (GST_IS_COLLECT_PADS2 (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_SIZE (buffer) - data->pos);
return gst_buffer_create_sub (buffer, data->pos, readsize);
}
/**
* gst_collect_pads2_take_buffer:
* @pads: the collectspads 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.
*
* Since: 0.10.36
*
* 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.
*
* MT safe.
*/
GstBuffer *
gst_collect_pads2_take_buffer (GstCollectPads2 * pads, GstCollectData2 * data,
guint size)
{
GstBuffer *buffer = gst_collect_pads2_read_buffer (pads, data, size);
if (buffer) {
gst_collect_pads2_flush (pads, data, GST_BUFFER_SIZE (buffer));
}
return buffer;
}
/**
* gst_collect_pads2_set_waiting:
* @pads: the collectspads
* @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.
*
* Since: 0.10.36
*/
void
gst_collect_pads2_set_waiting (GstCollectPads2 * pads, GstCollectData2 * data,
gboolean waiting)
{
g_return_if_fail (pads != NULL);
g_return_if_fail (GST_IS_COLLECT_PADS2 (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_PADS2_STATE_IS_SET (data, GST_COLLECT_PADS2_STATE_LOCKED));
/* Do something only on a change and if not locked */
if (!GST_COLLECT_PADS2_STATE_IS_SET (data, GST_COLLECT_PADS2_STATE_LOCKED) &&
(GST_COLLECT_PADS2_STATE_IS_SET (data, GST_COLLECT_PADS2_STATE_WAITING) !=
! !waiting)) {
/* Set waiting state for this pad */
if (waiting)
GST_COLLECT_PADS2_STATE_SET (data, GST_COLLECT_PADS2_STATE_WAITING);
else
GST_COLLECT_PADS2_STATE_UNSET (data, GST_COLLECT_PADS2_STATE_WAITING);
/* Update number of queued pads if needed */
if (!data->buffer &&
!GST_COLLECT_PADS2_STATE_IS_SET (data, GST_COLLECT_PADS2_STATE_EOS)) {
if (waiting)
pads->queuedpads--;
else
pads->queuedpads++;
}
/* signal waiters because something changed */
GST_COLLECT_PADS2_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_pads2_check_pads (GstCollectPads2 * pads)
{
/* the master list and cookie are protected with LOCK */
GST_OBJECT_LOCK (pads);
if (G_UNLIKELY (pads->pad_cookie != pads->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->numpads = 0;
pads->queuedpads = 0;
pads->eospads = 0;
if (pads->earliest_data)
unref_data (pads->earliest_data);
pads->earliest_data = NULL;
pads->earliest_time = GST_CLOCK_TIME_NONE;
/* loop over the master pad list */
collected = pads->pad_list;
for (; collected; collected = g_slist_next (collected)) {
GstCollectData2 *data;
/* update the stats */
pads->numpads++;
data = collected->data;
if (GST_COLLECT_PADS2_STATE_IS_SET (data, GST_COLLECT_PADS2_STATE_EOS))
pads->eospads++;
else if (data->buffer || !GST_COLLECT_PADS2_STATE_IS_SET (data,
GST_COLLECT_PADS2_STATE_WAITING))
pads->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->cookie = pads->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_pads2_check_collected (GstCollectPads2 * pads)
{
GstFlowReturn flow_ret = GST_FLOW_OK;
GstCollectPads2Function func;
gpointer user_data;
g_return_val_if_fail (GST_IS_COLLECT_PADS2 (pads), GST_FLOW_ERROR);
GST_OBJECT_LOCK (pads);
func = pads->func;
user_data = pads->user_data;
GST_OBJECT_UNLOCK (pads);
g_return_val_if_fail (pads->func != NULL, GST_FLOW_NOT_SUPPORTED);
/* check for new pads, update stats etc.. */
gst_collect_pads2_check_pads (pads);
if (G_UNLIKELY (pads->eospads == pads->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->numpads, GST_DEBUG_FUNCPTR_NAME (func));
flow_ret = func (pads, user_data);
} else {
gboolean collected = FALSE;
/* We call the collected function as long as our condition matches. */
while (((pads->queuedpads + pads->eospads) >= pads->numpads)) {
GST_DEBUG_OBJECT (pads, "All active pads (%d + %d >= %d) have data, "
"calling %s", pads->queuedpads, pads->eospads, pads->numpads,
GST_DEBUG_FUNCPTR_NAME (func));
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->queuedpads == 0)
break;
}
if (!collected)
GST_DEBUG_OBJECT (pads, "Not all active pads (%d) have data, continuing",
pads->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_pads2_recalculate_waiting (GstCollectPads2 * pads)
{
GSList *collected;
gboolean result = FALSE;
/* If earliest time is not known, there is nothing to do. */
if (pads->earliest_data == NULL)
return FALSE;
for (collected = pads->data; collected; collected = g_slist_next (collected)) {
GstCollectData2 *data = (GstCollectData2 *) collected->data;
int cmp_res;
/* check if pad has a segment */
if (data->segment.format == GST_FORMAT_UNDEFINED)
continue;
/* check segment format */
if (data->segment.format != GST_FORMAT_TIME) {
GST_ERROR_OBJECT (pads, "GstCollectPads2 can handle only time segments.");
continue;
}
/* check if the waiting state should be changed */
cmp_res = pads->compare_func (pads, data, data->segment.start,
pads->earliest_data, pads->earliest_time, pads->compare_user_data);
if (cmp_res > 0)
/* stop waiting */
gst_collect_pads2_set_waiting (pads, data, FALSE);
else {
if (!GST_COLLECT_PADS2_STATE_IS_SET (data,
GST_COLLECT_PADS2_STATE_WAITING)) {
/* start waiting */
gst_collect_pads2_set_waiting (pads, data, TRUE);
result = TRUE;
}
}
}
return result;
}
/**
* gst_collect_pads2_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 #GstCollectData2 and buffertime.
*
* This function should be called with STREAM_LOCK held,
* such as in the callback.
*
* Since: 0.10.36
*/
static void
gst_collect_pads2_find_best_pad (GstCollectPads2 * pads,
GstCollectData2 ** data, GstClockTime * time)
{
GSList *collected;
GstCollectData2 *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;
GstCollectData2 *data = (GstCollectData2 *) collected->data;
GstClockTime timestamp;
buffer = gst_collect_pads2_peek (pads, data);
/* if we have a buffer check if it is better then the current best one */
if (buffer != NULL) {
timestamp = GST_BUFFER_TIMESTAMP (buffer);
gst_buffer_unref (buffer);
if (best == NULL || pads->compare_func (pads, data, timestamp,
best, best_time, pads->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 (((GstCollectData2 *) best)->pad) : "(nil)",
GST_TIME_ARGS (best_time));
}
/*
* Function to recalculate earliest_data and earliest_timestamp. This also calls
* gst_collect_pads2_recalculate_waiting
*
* Must be called with STREAM_LOCK.
*/
static gboolean
gst_collect_pads2_recalculate_full (GstCollectPads2 * pads)
{
if (pads->earliest_data)
unref_data (pads->earliest_data);
gst_collect_pads2_find_best_pad (pads, &pads->earliest_data,
&pads->earliest_time);
if (pads->earliest_data)
ref_data (pads->earliest_data);
return gst_collect_pads2_recalculate_waiting (pads);
}
/*
* Default collect callback triggered when #GstCollectPads2 gathered all data.
*
* Called with STREAM_LOCK.
*/
static GstFlowReturn
gst_collect_pads2_default_collected (GstCollectPads2 * pads, gpointer user_data)
{
GstCollectData2 *best = NULL;
GstBuffer *buffer;
GstFlowReturn ret = GST_FLOW_OK;
GstCollectPads2BufferFunction func;
gpointer buffer_user_data;
g_return_val_if_fail (GST_IS_COLLECT_PADS2 (pads), GST_FLOW_ERROR);
GST_OBJECT_LOCK (pads);
func = pads->buffer_func;
buffer_user_data = pads->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_pads2_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;
}
best = pads->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_UNEXPECTED;
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_pads2_set_waiting (pads, best, TRUE);
/* Send buffer */
buffer = gst_collect_pads2_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_pads2_recalculate_full (pads);
done:
return ret;
}
/*
* Default timestamp compare function.
*/
static gint
gst_collect_pads2_default_compare_func (GstCollectPads2 * pads,
GstCollectData2 * data1, GstClockTime timestamp1,
GstCollectData2 * 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;
}
static gboolean
gst_collect_pads2_event (GstPad * pad, GstEvent * event)
{
gboolean res = FALSE, need_unlock = FALSE;
GstCollectData2 *data;
GstCollectPads2 *pads;
GstCollectPads2EventFunction event_func;
GstCollectPads2BufferFunction buffer_func;
gpointer event_user_data;
/* some magic to get the managing collect_pads2 */
GST_OBJECT_LOCK (pad);
data = (GstCollectData2 *) 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 ("Got %s event on pad %s:%s", GST_EVENT_TYPE_NAME (event),
GST_DEBUG_PAD_NAME (data->pad));
GST_OBJECT_LOCK (pads);
event_func = pads->event_func;
event_user_data = pads->event_user_data;
buffer_func = pads->buffer_func;
GST_OBJECT_UNLOCK (pads);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
{
/* forward event to unblock check_collected */
if (event_func)
res = event_func (pads, data, event, event_user_data);
if (!res)
res = gst_pad_event_default (pad, event);
/* now unblock the chain function.
* no cond per pad, so they all unblock,
* non-flushing block again */
GST_COLLECT_PADS2_STREAM_LOCK (pads);
GST_COLLECT_PADS2_STATE_SET (data, GST_COLLECT_PADS2_STATE_FLUSHING);
gst_collect_pads2_clear (pads, data);
/* cater for possible default muxing functionality */
if (buffer_func) {
/* restore to initial state */
gst_collect_pads2_set_waiting (pads, data, TRUE);
/* if the current pad is affected, reset state, recalculate later */
if (pads->earliest_data == data) {
unref_data (data);
pads->earliest_data = NULL;
pads->earliest_time = GST_CLOCK_TIME_NONE;
}
}
GST_COLLECT_PADS2_STREAM_UNLOCK (pads);
/* event already cleaned up by forwarding */
res = TRUE;
goto done;
}
case GST_EVENT_FLUSH_STOP:
{
/* flush the 1 buffer queue */
GST_COLLECT_PADS2_STREAM_LOCK (pads);
GST_COLLECT_PADS2_STATE_UNSET (data, GST_COLLECT_PADS2_STATE_FLUSHING);
gst_collect_pads2_clear (pads, data);
/* we need new segment info after the flush */
gst_segment_init (&data->segment, GST_FORMAT_UNDEFINED);
GST_COLLECT_PADS2_STATE_UNSET (data, GST_COLLECT_PADS2_STATE_NEW_SEGMENT);
/* if the pad was EOS, remove the EOS flag and
* decrement the number of eospads */
if (G_UNLIKELY (GST_COLLECT_PADS2_STATE_IS_SET (data,
GST_COLLECT_PADS2_STATE_EOS))) {
if (!GST_COLLECT_PADS2_STATE_IS_SET (data,
GST_COLLECT_PADS2_STATE_WAITING))
pads->queuedpads++;
pads->eospads--;
GST_COLLECT_PADS2_STATE_UNSET (data, GST_COLLECT_PADS2_STATE_EOS);
}
GST_COLLECT_PADS2_STREAM_UNLOCK (pads);
/* forward event */
goto forward_or_default;
}
case GST_EVENT_EOS:
{
GST_COLLECT_PADS2_STREAM_LOCK (pads);
/* if the pad was not EOS, make it EOS and so we
* have one more eospad */
if (G_LIKELY (!GST_COLLECT_PADS2_STATE_IS_SET (data,
GST_COLLECT_PADS2_STATE_EOS))) {
GST_COLLECT_PADS2_STATE_SET (data, GST_COLLECT_PADS2_STATE_EOS);
if (!GST_COLLECT_PADS2_STATE_IS_SET (data,
GST_COLLECT_PADS2_STATE_WAITING))
pads->queuedpads--;
pads->eospads++;
}
/* check if we need collecting anything, we ignore the result. */
gst_collect_pads2_check_collected (pads);
GST_COLLECT_PADS2_STREAM_UNLOCK (pads);
goto forward_or_eat;
}
case GST_EVENT_NEWSEGMENT:
{
gint64 start, stop, time;
gdouble rate, arate;
GstFormat format;
gboolean update;
gint cmp_res;
GST_COLLECT_PADS2_STREAM_LOCK (pads);
gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
&start, &stop, &time);
GST_DEBUG_OBJECT (data->pad, "got newsegment, start %" GST_TIME_FORMAT
", stop %" GST_TIME_FORMAT, GST_TIME_ARGS (start),
GST_TIME_ARGS (stop));
gst_segment_set_newsegment_full (&data->segment, update, rate, arate,
format, start, stop, time);
GST_COLLECT_PADS2_STATE_SET (data, GST_COLLECT_PADS2_STATE_NEW_SEGMENT);
/* default muxing functionality */
if (!buffer_func)
goto newsegment_done;
/* default collection can not handle other segment formats than time */
if (format != GST_FORMAT_TIME) {
GST_ERROR_OBJECT (pads, "GstCollectPads2 default collecting "
"can only handle time segments.");
goto newsegment_done;
}
/* If oldest time is not known, or current pad got newsegment;
* recalculate the state */
if (!pads->earliest_data || pads->earliest_data == data) {
gst_collect_pads2_recalculate_full (pads);
goto newsegment_done;
}
/* Check if the waiting state of the pad should change. */
cmp_res = pads->compare_func (pads, data, start, pads->earliest_data,
pads->earliest_time, pads->compare_user_data);
if (cmp_res > 0)
/* Stop waiting */
gst_collect_pads2_set_waiting (pads, data, FALSE);
newsegment_done:
GST_COLLECT_PADS2_STREAM_UNLOCK (pads);
/* we must not forward this event since multiple segments will be
* accumulated and this is certainly not what we want. */
goto forward_or_eat;
}
default:
/* forward other events */
goto forward_or_default;
}
forward_or_default:
if (GST_EVENT_IS_SERIALIZED (event)) {
GST_COLLECT_PADS2_STREAM_LOCK (pads);
need_unlock = TRUE;
}
if (event_func)
res = event_func (pads, data, event, event_user_data);
if (!res)
res = gst_pad_event_default (pad, event);
if (need_unlock)
GST_COLLECT_PADS2_STREAM_UNLOCK (pads);
goto done;
forward_or_eat:
if (GST_EVENT_IS_SERIALIZED (event)) {
GST_COLLECT_PADS2_STREAM_LOCK (pads);
need_unlock = TRUE;
}
if (event_func)
res = event_func (pads, data, event, event_user_data);
if (!res) {
gst_event_unref (event);
res = TRUE;
}
if (need_unlock)
GST_COLLECT_PADS2_STREAM_UNLOCK (pads);
goto done;
done:
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_pads2_chain (GstPad * pad, GstBuffer * buffer)
{
GstCollectData2 *data;
GstCollectPads2 *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_pads2 */
GST_OBJECT_LOCK (pad);
data = (GstCollectData2 *) 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_PADS2_STREAM_LOCK (pads);
/* if not started, bail out */
if (G_UNLIKELY (!pads->started))
goto not_started;
/* check if this pad is flushing */
if (G_UNLIKELY (GST_COLLECT_PADS2_STATE_IS_SET (data,
GST_COLLECT_PADS2_STATE_FLUSHING)))
goto flushing;
/* pad was EOS, we can refuse this data */
if (G_UNLIKELY (GST_COLLECT_PADS2_STATE_IS_SET (data,
GST_COLLECT_PADS2_STATE_EOS)))
goto unexpected;
/* see if we need to clip */
if (pads->clip_func) {
GstBuffer *outbuf = NULL;
ret = pads->clip_func (pads, data, buffer, &outbuf, pads->clip_user_data);
buffer = outbuf;
if (G_UNLIKELY (outbuf == NULL))
goto clipped;
if (G_UNLIKELY (ret == GST_FLOW_UNEXPECTED))
goto unexpected;
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_PADS2_STATE_IS_SET (data, GST_COLLECT_PADS2_STATE_WAITING))
pads->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 = GST_BUFFER_TIMESTAMP (buffer);
if (GST_CLOCK_TIME_IS_VALID (timestamp))
gst_segment_set_last_stop (&data->segment, GST_FORMAT_TIME, 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_pads2_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_PADS2_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_PADS2_STREAM_UNLOCK (pads);
GST_COLLECT_PADS2_EVT_WAIT (pads, cookie);
GST_COLLECT_PADS2_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->started))
goto not_started;
/* check if this pad is flushing */
if (G_UNLIKELY (GST_COLLECT_PADS2_STATE_IS_SET (data,
GST_COLLECT_PADS2_STATE_FLUSHING)))
goto flushing;
}
while (data->buffer != NULL);
unlock_done:
GST_COLLECT_PADS2_STREAM_UNLOCK (pads);
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_pads2_clear (pads, data);
ret = GST_FLOW_WRONG_STATE;
goto unlock_done;
}
flushing:
{
GST_DEBUG ("pad %s:%s is flushing", GST_DEBUG_PAD_NAME (pad));
gst_collect_pads2_clear (pads, data);
ret = GST_FLOW_WRONG_STATE;
goto unlock_done;
}
unexpected:
{
/* 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_UNEXPECTED;
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_pads2_clear (pads, data);
goto unlock_done;
}
}
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