/* GStreamer
* Copyright (C) 2005 Wim Taymans <wim@fluendo.com>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, 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, 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() 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 collecpads.
* 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_collect() and gst_collect_pads_collect_range() can be used by
* elements that start a #GstTask to drive the collect_pads. This feature is however
* not yet implemented.
* </para></listitem>
* </itemizedlist>
*
* Last reviewed on 2006-05-10 (0.10.6)
*/
#ifdef __SYMBIAN32__
#include <gst_global.h>
#endif
#include "gstcollectpads.h"
#ifdef __SYMBIAN32__
#include <glib_global.h>
#include <gobject_global.h>
#endif
GST_DEBUG_CATEGORY_STATIC (collect_pads_debug);
#define GST_CAT_DEFAULT collect_pads_debug
GST_BOILERPLATE (GstCollectPads, gst_collect_pads, GstObject, GST_TYPE_OBJECT);
static void gst_collect_pads_clear (GstCollectPads * pads,
GstCollectData * data);
static GstFlowReturn gst_collect_pads_chain (GstPad * pad, GstBuffer * buffer);
static gboolean gst_collect_pads_event (GstPad * pad, GstEvent * event);
static void gst_collect_pads_finalize (GObject * object);
static void gst_collect_pads_init (GstCollectPads * pads,
GstCollectPadsClass * g_class);
static void ref_data (GstCollectData * data);
static void unref_data (GstCollectData * data);
static void
gst_collect_pads_base_init (gpointer g_class)
{
/* Do nothing here */
}
static void
gst_collect_pads_class_init (GstCollectPadsClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
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, GstCollectPadsClass * g_class)
{
pads->cond = g_cond_new ();
pads->data = NULL;
pads->cookie = 0;
pads->numpads = 0;
pads->queuedpads = 0;
pads->eospads = 0;
pads->started = FALSE;
/* members to manage the pad list */
pads->abidata.ABI.pad_lock = g_mutex_new ();
pads->abidata.ABI.pad_cookie = 0;
pads->abidata.ABI.pad_list = NULL;
}
static void
gst_collect_pads_finalize (GObject * object)
{
GSList *collected;
GstCollectPads *pads = GST_COLLECT_PADS (object);
GST_DEBUG ("finalize");
g_cond_free (pads->cond);
g_mutex_free (pads->abidata.ABI.pad_lock);
/* Remove pads */
collected = pads->abidata.ABI.pad_list;
for (; collected; collected = g_slist_next (collected)) {
GstCollectData *pdata = (GstCollectData *) collected->data;
unref_data (pdata);
}
/* Free pads list */
g_slist_foreach (pads->data, (GFunc) unref_data, NULL);
g_slist_free (pads->data);
g_slist_free (pads->abidata.ABI.pad_list);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/**
* gst_collect_pads_new:
*
* Create a new instance of #GstCollectsPads.
*
* Returns: a new #GstCollectPads, or NULL in case of an error.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstCollectPads *
gst_collect_pads_new (void)
{
GstCollectPads *newcoll;
newcoll = g_object_new (GST_TYPE_COLLECT_PADS, NULL);
return newcoll;
}
/**
* gst_collect_pads_set_function:
* @pads: the collectspads 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 when
* all the pads added to the collection have buffers queued.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
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->func = func;
pads->user_data = user_data;
GST_OBJECT_UNLOCK (pads);
}
static void
ref_data (GstCollectData * data)
{
g_assert (data != NULL);
g_atomic_int_inc (&(data->abidata.ABI.refcount));
}
static void
unref_data (GstCollectData * data)
{
GstCollectDataDestroyNotify destroy_notify;
g_assert (data != NULL);
g_assert (data->abidata.ABI.refcount > 0);
if (!g_atomic_int_dec_and_test (&(data->abidata.ABI.refcount)))
return;
/* FIXME: Ugly hack as we can't add more fields to GstCollectData */
destroy_notify = (GstCollectDataDestroyNotify)
g_object_get_data (G_OBJECT (data->pad),
"gst-collect-data-destroy-notify");
if (destroy_notify)
destroy_notify (data);
g_object_unref (data->pad);
if (data->buffer) {
gst_buffer_unref (data->buffer);
}
g_free (data);
}
/**
* gst_collect_pads_add_pad:
* @pads: the collectspads to use
* @pad: the pad to add
* @size: the size of the returned #GstCollectData 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_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.
*
* The pad will be automatically activated in push mode when @pads is
* started.
*
* This function calls gst_collect_pads_add_pad() passing a value of NULL
* for destroy_notify.
*
* Returns: a new #GstCollectData to identify the new pad. Or NULL
* if wrong parameters are supplied.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstCollectData *
gst_collect_pads_add_pad (GstCollectPads * pads, GstPad * pad, guint size)
{
return gst_collect_pads_add_pad_full (pads, pad, size, NULL);
}
/**
* gst_collect_pads_add_pad_full:
* @pads: the collectspads to use
* @pad: 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
*
* 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.
*
* The pad will be automatically activated in push mode when @pads is
* started.
*
* Since: 0.10.12
*
* Returns: a new #GstCollectData to identify the new pad. Or NULL
* if wrong parameters are supplied.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstCollectData *
gst_collect_pads_add_pad_full (GstCollectPads * pads, GstPad * pad, guint size,
GstCollectDataDestroyNotify destroy_notify)
{
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 ("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->abidata.ABI.flushing = FALSE;
data->abidata.ABI.new_segment = FALSE;
data->abidata.ABI.eos = FALSE;
data->abidata.ABI.refcount = 1;
/* FIXME: Ugly hack as we can't add more fields to GstCollectData */
g_object_set_data (G_OBJECT (pad), "gst-collect-data-destroy-notify",
(void *) destroy_notify);
GST_COLLECT_PADS_PAD_LOCK (pads);
GST_OBJECT_LOCK (pad);
gst_pad_set_element_private (pad, data);
GST_OBJECT_UNLOCK (pad);
pads->abidata.ABI.pad_list =
g_slist_append (pads->abidata.ABI.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));
/* activate the pad when needed */
if (pads->started)
gst_pad_set_active (pad, TRUE);
pads->abidata.ABI.pad_cookie++;
GST_COLLECT_PADS_PAD_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 collectspads to use
* @pad: 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.
*
* Returns: %TRUE if the pad could be removed.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
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 ("removing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
GST_COLLECT_PADS_PAD_LOCK (pads);
list =
g_slist_find_custom (pads->abidata.ABI.pad_list, pad,
(GCompareFunc) find_pad);
if (!list)
goto unknown_pad;
data = (GstCollectData *) list->data;
GST_DEBUG ("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 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) {
GstCollectData *pdata = dlist->data;
pads->data = g_slist_delete_link (pads->data, dlist);
unref_data (pdata);
}
}
/* remove from the pad list */
pads->abidata.ABI.pad_list =
g_slist_delete_link (pads->abidata.ABI.pad_list, list);
pads->abidata.ABI.pad_cookie++;
/* signal waiters because something changed */
GST_COLLECT_PADS_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_COLLECT_PADS_PAD_UNLOCK (pads);
return TRUE;
unknown_pad:
{
GST_WARNING ("cannot remove unknown pad %s:%s", GST_DEBUG_PAD_NAME (pad));
GST_COLLECT_PADS_PAD_UNLOCK (pads);
return FALSE;
}
}
/**
* gst_collect_pads_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.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
gboolean
gst_collect_pads_is_active (GstCollectPads * pads, GstPad * pad)
{
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);
g_warning ("gst_collect_pads_is_active() is not implemented");
return FALSE;
}
/**
* gst_collect_pads_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.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstFlowReturn
gst_collect_pads_collect (GstCollectPads * pads)
{
g_return_val_if_fail (pads != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (GST_IS_COLLECT_PADS (pads), GST_FLOW_ERROR);
g_warning ("gst_collect_pads_collect() is not implemented");
return GST_FLOW_NOT_SUPPORTED;
}
/**
* gst_collect_pads_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.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
GstFlowReturn
gst_collect_pads_collect_range (GstCollectPads * pads, guint64 offset,
guint length)
{
g_return_val_if_fail (pads != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (GST_IS_COLLECT_PADS (pads), GST_FLOW_ERROR);
g_warning ("gst_collect_pads_collect_range() is not implemented");
return GST_FLOW_NOT_SUPPORTED;
}
/* FIXME, I think this function is used to work around bad behaviour
* of elements that add pads to themselves without activating them.
*
* Must be called with PAD_LOCK.
*/
static void
gst_collect_pads_set_flushing_unlocked (GstCollectPads * pads,
gboolean flushing)
{
GSList *walk = NULL;
/* Update the pads flushing flag */
for (walk = pads->data; 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);
cdata->abidata.ABI.flushing = flushing;
gst_collect_pads_clear (pads, cdata);
GST_OBJECT_UNLOCK (cdata->pad);
}
}
}
/**
* gst_collect_pads_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.
*
* MT safe.
*
* Since: 0.10.7.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
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));
GST_COLLECT_PADS_PAD_LOCK (pads);
gst_collect_pads_set_flushing_unlocked (pads, flushing);
GST_COLLECT_PADS_PAD_UNLOCK (pads);
}
/**
* gst_collect_pads_start:
* @pads: the collectspads to use
*
* Starts the processing of data in the collect_pads.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
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_OBJECT_LOCK (pads);
/* make pads streamable */
GST_COLLECT_PADS_PAD_LOCK (pads);
/* loop over the master pad list and reset the segment */
collected = pads->abidata.ABI.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->started = TRUE;
GST_COLLECT_PADS_PAD_UNLOCK (pads);
GST_OBJECT_UNLOCK (pads);
}
/**
* gst_collect_pads_stop:
* @pads: the collectspads to use
*
* Stops the processing of data in the collect_pads. this function
* will also unblock any blocking operations.
*
* MT safe.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
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_OBJECT_LOCK (pads);
/* make pads not accept data anymore */
GST_COLLECT_PADS_PAD_LOCK (pads);
gst_collect_pads_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->abidata.ABI.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;
}
data->abidata.ABI.eos = FALSE;
}
GST_COLLECT_PADS_PAD_UNLOCK (pads);
/* Wake them up so they can end the chain functions. */
GST_COLLECT_PADS_BROADCAST (pads);
GST_OBJECT_UNLOCK (pads);
}
/**
* gst_collect_pads_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 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.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
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 ("Peeking at pad %s:%s: buffer=%p",
GST_DEBUG_PAD_NAME (data->pad), result);
return result;
}
/**
* gst_collect_pads_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 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.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
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 */
pads->queuedpads--;
}
GST_COLLECT_PADS_BROADCAST (pads);
GST_DEBUG ("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 e called with the LOCK
* helt. */
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 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 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.
*/
/* FIXME, we can do this in the _chain functions */
#ifdef __SYMBIAN32__
EXPORT_C
#endif
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);
for (collected = pads->data; collected; collected = g_slist_next (collected)) {
GstCollectData *pdata;
GstBuffer *buffer;
gint size;
pdata = (GstCollectData *) collected->data;
/* ignore pad with EOS */
if (G_UNLIKELY (pdata->abidata.ABI.eos)) {
GST_DEBUG ("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 ("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 ("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_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 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.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
guint
gst_collect_pads_read (GstCollectPads * pads, GstCollectData * 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_PADS (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_pads_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 LOCK held, such as in the callback.
*
* Since: 0.10.18
*
* 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.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
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_SIZE (buffer) - data->pos);
return gst_buffer_create_sub (buffer, data->pos, readsize);
}
/**
* gst_collect_pads_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 LOCK held, such as in the callback.
*
* Since: 0.10.18
*
* 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.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
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_SIZE (buffer));
}
return buffer;
}
/**
* gst_collect_pads_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 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.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
guint
gst_collect_pads_flush (GstCollectPads * pads, GstCollectData * data,
guint size)
{
guint flushsize;
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;
/* 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_pads_clear (pads, data);
return flushsize;
}
/* see if pads were added or removed and update our stats. Any pad
* added after releasing the PAD_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 LOCK.
*/
static void
gst_collect_pads_check_pads (GstCollectPads * pads)
{
/* the master list and cookie are protected with the PAD_LOCK */
GST_COLLECT_PADS_PAD_LOCK (pads);
if (G_UNLIKELY (pads->abidata.ABI.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;
/* loop over the master pad list */
collected = pads->abidata.ABI.pad_list;
for (; collected; collected = g_slist_next (collected)) {
GstCollectData *data;
/* update the stats */
pads->numpads++;
data = collected->data;
if (data->buffer)
pads->queuedpads++;
if (data->abidata.ABI.eos)
pads->eospads++;
/* add to the list of pads to collect */
ref_data (data);
pads->data = g_slist_prepend (pads->data, data);
}
/* and update the cookie */
pads->cookie = pads->abidata.ABI.pad_cookie;
}
GST_COLLECT_PADS_PAD_UNLOCK (pads);
}
/* checks if all the pads are collected and call the collectfunction
*
* Should be called with LOCK.
*
* Returns: The #GstFlowReturn of collection.
*/
static GstFlowReturn
gst_collect_pads_check_collected (GstCollectPads * pads)
{
GstFlowReturn flow_ret = GST_FLOW_OK;
g_return_val_if_fail (GST_IS_COLLECT_PADS (pads), GST_FLOW_ERROR);
g_return_val_if_fail (pads->func != NULL, GST_FLOW_NOT_SUPPORTED);
/* check for new pads, update stats etc.. */
gst_collect_pads_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 ("All active pads (%d) are EOS, calling %s",
pads->numpads, GST_DEBUG_FUNCPTR_NAME (pads->func));
flow_ret = pads->func (pads, pads->user_data);
} else {
gboolean collected = FALSE;
/* We call the collected function as long as our condition matches.
* FIXME: should we error out if the collect function did not pop anything ?
* we can get a busy loop here if the element does not pop from the collect
* function
*/
while (((pads->queuedpads + pads->eospads) >= pads->numpads)) {
GST_DEBUG ("All active pads (%d + %d >= %d) have data, calling %s",
pads->queuedpads, pads->eospads, pads->numpads,
GST_DEBUG_FUNCPTR_NAME (pads->func));
flow_ret = pads->func (pads, 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 ("Not all active pads (%d) have data, continuing",
pads->numpads);
}
return flow_ret;
}
static gboolean
gst_collect_pads_event (GstPad * pad, GstEvent * event)
{
gboolean res;
GstCollectData *data;
GstCollectPads *pads;
/* 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 = TRUE;
pads = data->collect;
GST_DEBUG ("Got %s event on pad %s:%s", GST_EVENT_TYPE_NAME (event),
GST_DEBUG_PAD_NAME (data->pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
{
/* forward event to unblock check_collected */
gst_pad_event_default (pad, event);
/* now unblock the chain function.
* no cond per pad, so they all unblock,
* non-flushing block again */
GST_OBJECT_LOCK (pads);
data->abidata.ABI.flushing = TRUE;
gst_collect_pads_clear (pads, data);
GST_OBJECT_UNLOCK (pads);
/* event already cleaned up by forwarding */
goto done;
}
case GST_EVENT_FLUSH_STOP:
{
/* flush the 1 buffer queue */
GST_OBJECT_LOCK (pads);
data->abidata.ABI.flushing = FALSE;
gst_collect_pads_clear (pads, data);
/* we need new segment info after the flush */
gst_segment_init (&data->segment, GST_FORMAT_UNDEFINED);
data->abidata.ABI.new_segment = FALSE;
/* if the pad was EOS, remove the EOS flag and
* decrement the number of eospads */
if (G_UNLIKELY (data->abidata.ABI.eos == TRUE)) {
pads->eospads--;
data->abidata.ABI.eos = FALSE;
}
GST_OBJECT_UNLOCK (pads);
/* forward event */
goto forward;
}
case GST_EVENT_EOS:
{
GST_OBJECT_LOCK (pads);
/* if the pad was not EOS, make it EOS and so we
* have one more eospad */
if (G_LIKELY (data->abidata.ABI.eos == FALSE)) {
data->abidata.ABI.eos = TRUE;
pads->eospads++;
}
/* check if we need collecting anything, we ignore the
* result. */
gst_collect_pads_check_collected (pads);
GST_OBJECT_UNLOCK (pads);
/* We eat this event, element should do something
* in the collected callback. */
gst_event_unref (event);
goto done;
}
case GST_EVENT_NEWSEGMENT:
{
gint64 start, stop, time;
gdouble rate, arate;
GstFormat format;
gboolean update;
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);
data->abidata.ABI.new_segment = TRUE;
/* we must not forward this event since multiple segments will be
* accumulated and this is certainly not what we want. */
gst_event_unref (event);
/* FIXME: collect-pads based elements need to create their own newsegment
* event (and only one really)
* (a) make the segment part of the GstCollectData structure of each pad,
* so you can just check that once you have a buffer queued on that pad,
* (b) you can override a pad's event function with your own,
* catch the newsegment event and then pass it on to the original
* gstcollectpads event function
* (that's what avimux does for something IIRC)
* see #340060
*/
goto done;
}
default:
/* forward other events */
goto forward;
}
forward:
res = gst_pad_event_default (pad, event);
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_pads_chain (GstPad * pad, GstBuffer * buffer)
{
GstCollectData *data;
GstCollectPads *pads;
guint64 size;
GstFlowReturn ret;
GstBuffer **buffer_p;
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;
size = GST_BUFFER_SIZE (buffer);
GST_OBJECT_LOCK (pads);
/* if not started, bail out */
if (G_UNLIKELY (!pads->started))
goto not_started;
/* check if this pad is flushing */
if (G_UNLIKELY (data->abidata.ABI.flushing))
goto flushing;
/* pad was EOS, we can refuse this data */
if (G_UNLIKELY (data->abidata.ABI.eos))
goto unexpected;
GST_DEBUG ("Queuing buffer %p for pad %s:%s", buffer,
GST_DEBUG_PAD_NAME (pad));
/* One more pad has data queued */
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_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;
/* Check if we got removed in the mean time, FIXME, this is racy.
* Between this check and the _WAIT, the pad could be removed which will
* makes us hang in the _WAIT. */
GST_OBJECT_LOCK (pad);
if (G_UNLIKELY (gst_pad_get_element_private (pad) == NULL))
goto pad_removed;
GST_OBJECT_UNLOCK (pad);
GST_DEBUG ("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_WAIT (pads);
GST_DEBUG ("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 (data->abidata.ABI.flushing))
goto flushing;
}
while (data->buffer != NULL);
unlock_done:
GST_OBJECT_UNLOCK (pads);
unref_data (data);
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_WRONG_STATE;
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_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;
}
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;
}
}