mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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0edc93ae29
Original commit message from CVS: Added parameter checking to gst_queue_get().
384 lines
10 KiB
C
384 lines
10 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstqueue.c:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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//#define DEBUG_ENABLED
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//#define STATUS_ENABLED
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#ifdef STATUS_ENABLED
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#define STATUS(A) GST_DEBUG(0,A, gst_element_get_name(GST_ELEMENT(queue)))
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#else
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#define STATUS(A)
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#endif
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#include <pthread.h>
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#include "config.h"
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#include "gst_private.h"
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#include "gstqueue.h"
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GstElementDetails gst_queue_details = {
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"Queue",
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"Connection",
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"Simple data queue",
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VERSION,
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"Erik Walthinsen <omega@cse.ogi.edu>",
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"(C) 1999",
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};
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/* Queue signals and args */
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enum {
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/* FILL ME */
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LAST_SIGNAL
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};
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enum {
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ARG_0,
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ARG_LEVEL,
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ARG_MAX_LEVEL,
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ARG_BLOCK,
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};
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static void gst_queue_class_init (GstQueueClass *klass);
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static void gst_queue_init (GstQueue *queue);
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static void gst_queue_set_arg (GtkObject *object, GtkArg *arg, guint id);
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static void gst_queue_get_arg (GtkObject *object, GtkArg *arg, guint id);
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static gboolean gst_queue_handle_eos (GstPad *pad);
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static void gst_queue_chain (GstPad *pad, GstBuffer *buf);
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static GstBuffer * gst_queue_get (GstPad *pad);
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static void gst_queue_flush (GstQueue *queue);
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static GstElementStateReturn gst_queue_change_state (GstElement *element);
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static GstElementClass *parent_class = NULL;
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//static guint gst_queue_signals[LAST_SIGNAL] = { 0 };
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GtkType
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gst_queue_get_type(void) {
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static GtkType queue_type = 0;
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if (!queue_type) {
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static const GtkTypeInfo queue_info = {
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"GstQueue",
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sizeof(GstQueue),
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sizeof(GstQueueClass),
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(GtkClassInitFunc)gst_queue_class_init,
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(GtkObjectInitFunc)gst_queue_init,
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(GtkArgSetFunc)gst_queue_set_arg,
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(GtkArgGetFunc)gst_queue_get_arg,
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(GtkClassInitFunc)NULL,
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};
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queue_type = gtk_type_unique (GST_TYPE_ELEMENT, &queue_info);
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}
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return queue_type;
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}
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static void
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gst_queue_class_init (GstQueueClass *klass)
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{
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GtkObjectClass *gtkobject_class;
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GstElementClass *gstelement_class;
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gtkobject_class = (GtkObjectClass*)klass;
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gstelement_class = (GstElementClass*)klass;
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parent_class = gtk_type_class (GST_TYPE_ELEMENT);
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gtk_object_add_arg_type ("GstQueue::level", GTK_TYPE_INT,
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GTK_ARG_READABLE, ARG_LEVEL);
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gtk_object_add_arg_type ("GstQueue::max_level", GTK_TYPE_INT,
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GTK_ARG_READWRITE, ARG_MAX_LEVEL);
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gtk_object_add_arg_type ("GstQueue::block", GTK_TYPE_BOOL,
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GTK_ARG_READWRITE, ARG_BLOCK);
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gtkobject_class->set_arg = gst_queue_set_arg;
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gtkobject_class->get_arg = gst_queue_get_arg;
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gstelement_class->change_state = gst_queue_change_state;
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}
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static void
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gst_queue_init (GstQueue *queue)
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{
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// scheduling on this kind of element is, well, interesting
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GST_FLAG_SET (queue, GST_ELEMENT_DECOUPLED);
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queue->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
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gst_pad_set_chain_function (queue->sinkpad, GST_DEBUG_FUNCPTR(gst_queue_chain));
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gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad);
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gst_pad_set_eos_function (queue->sinkpad, gst_queue_handle_eos);
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queue->srcpad = gst_pad_new ("src", GST_PAD_SRC);
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gst_pad_set_get_function (queue->srcpad, GST_DEBUG_FUNCPTR(gst_queue_get));
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gst_element_add_pad (GST_ELEMENT (queue), queue->srcpad);
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queue->queue = NULL;
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queue->level_buffers = 0;
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queue->max_buffers = 100;
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queue->block = TRUE;
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queue->level_bytes = 0;
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queue->size_buffers = 0;
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queue->size_bytes = 0;
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queue->emptycond = g_cond_new ();
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queue->fullcond = g_cond_new ();
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}
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static gboolean
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gst_queue_handle_eos (GstPad *pad)
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{
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GstQueue *queue;
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queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
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GST_DEBUG (0,"queue: %s received eos\n", GST_ELEMENT_NAME (queue));
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GST_LOCK (queue);
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GST_DEBUG (0,"queue: %s has %d buffers left\n", GST_ELEMENT_NAME (queue),
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queue->level_buffers);
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GST_FLAG_SET (pad, GST_PAD_EOS);
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g_cond_signal (queue->emptycond);
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GST_UNLOCK (queue);
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return TRUE;
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}
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static void
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gst_queue_cleanup_buffers (gpointer data, const gpointer user_data)
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{
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GST_DEBUG (0,"queue: %s cleaning buffer %p\n", (gchar *)user_data, data);
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gst_buffer_unref (GST_BUFFER (data));
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}
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static void
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gst_queue_flush (GstQueue *queue)
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{
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g_slist_foreach (queue->queue, gst_queue_cleanup_buffers,
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(char *) GST_ELEMENT_NAME (queue));
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g_slist_free (queue->queue);
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queue->queue = NULL;
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queue->level_buffers = 0;
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queue->timeval = NULL;
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}
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static void
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gst_queue_chain (GstPad *pad, GstBuffer *buf)
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{
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GstQueue *queue;
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gboolean tosignal = FALSE;
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const guchar *name;
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g_return_if_fail (pad != NULL);
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g_return_if_fail (GST_IS_PAD (pad));
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g_return_if_fail (buf != NULL);
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queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
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name = GST_ELEMENT_NAME (queue);
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/* we have to lock the queue since we span threads */
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GST_DEBUG (0,"queue: try have queue lock\n");
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GST_LOCK (queue);
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GST_DEBUG (0,"queue: %s adding buffer %p %ld\n", name, buf, pthread_self ());
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GST_DEBUG (0,"queue: have queue lock\n");
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if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLUSH)) {
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gst_queue_flush (queue);
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}
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GST_DEBUG (0,"queue: %s: chain %d %p\n", name, queue->level_buffers, buf);
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while (queue->level_buffers >= queue->max_buffers) {
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GST_DEBUG (0,"queue: %s waiting %d\n", name, queue->level_buffers);
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STATUS("%s: O\n");
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//g_cond_timed_wait (queue->fullcond, queue->fulllock, queue->timeval);
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//FIXME need to signal other thread in case signals got lost?
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g_cond_signal (queue->emptycond);
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g_cond_wait (queue->fullcond, GST_OBJECT(queue)->lock);
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STATUS("%s: O+\n");
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GST_DEBUG (0,"queue: %s waiting done %d\n", name, queue->level_buffers);
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}
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/* put the buffer on the tail of the list */
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queue->queue = g_slist_append (queue->queue, buf);
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// STATUS("%s: +\n");
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GST_DEBUG (0,"(%s:%s)+ ",GST_DEBUG_PAD_NAME(pad));
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/* if we were empty, but aren't any more, signal a condition */
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tosignal = (queue->level_buffers >= 0);
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queue->level_buffers++;
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/* we can unlock now */
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GST_DEBUG (0,"queue: %s chain %d end signal(%d,%p)\n", name, queue->level_buffers, tosignal, queue->emptycond);
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if (tosignal) {
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// STATUS("%s: >\n");
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g_cond_signal (queue->emptycond);
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// STATUS("%s: >>\n");
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}
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GST_UNLOCK (queue);
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}
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static GstBuffer *
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gst_queue_get (GstPad *pad)
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{
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GstQueue *queue;
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GstBuffer *buf = NULL;
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GSList *front;
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const guchar *name;
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g_return_val_if_fail (pad != NULL, NULL);
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g_return_val_if_fail (GST_IS_PAD (pad), NULL);
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queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
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name = GST_ELEMENT_NAME (queue);
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/* have to lock for thread-safety */
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GST_DEBUG (0,"queue: %s try have queue lock\n", name);
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GST_LOCK (queue);
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GST_DEBUG (0,"queue: %s push %d %ld %p\n", name, queue->level_buffers, pthread_self (), queue->emptycond);
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GST_DEBUG (0,"queue: %s have queue lock\n", name);
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// we bail if there's nothing there
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if (!queue->level_buffers && !queue->block) {
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GST_UNLOCK(queue);
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return NULL;
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}
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while (!queue->level_buffers) {
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STATUS("queue: %s U released lock\n");
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//g_cond_timed_wait (queue->emptycond, queue->emptylock, queue->timeval);
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if (GST_FLAG_IS_SET (queue->sinkpad, GST_PAD_EOS)) {
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gst_pad_set_eos (queue->srcpad);
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return NULL;
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}
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//FIXME need to signal other thread in case signals got lost?
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g_cond_signal (queue->fullcond);
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g_cond_wait (queue->emptycond, GST_OBJECT(queue)->lock);
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// STATUS("queue: %s U- getting lock\n");
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}
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front = queue->queue;
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buf = (GstBuffer *)(front->data);
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GST_DEBUG (0,"retrieved buffer %p from queue\n",buf);
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queue->queue = g_slist_remove_link (queue->queue, front);
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g_slist_free (front);
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queue->level_buffers--;
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// STATUS("%s: -\n");
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GST_DEBUG (0,"(%s:%s)- ",GST_DEBUG_PAD_NAME(pad));
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if (queue->level_buffers < queue->max_buffers) {
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// STATUS("%s: < \n");
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g_cond_signal (queue->fullcond);
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// STATUS("%s: << \n");
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}
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GST_UNLOCK(queue);
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// GST_DEBUG (0,"queue: %s pushing %d %p \n", name, queue->level_buffers, buf);
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// gst_pad_push (queue->srcpad, buf);
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// GST_DEBUG (0,"queue: %s pushing %d done \n", name, queue->level_buffers);
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return buf;
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/* unlock now */
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}
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static GstElementStateReturn
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gst_queue_change_state (GstElement *element)
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{
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GstQueue *queue;
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g_return_val_if_fail (GST_IS_QUEUE (element), GST_STATE_FAILURE);
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queue = GST_QUEUE (element);
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GST_DEBUG (0,"gstqueue: state pending %d\n", GST_STATE_PENDING (element));
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/* if going down into NULL state, clear out buffers*/
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if (GST_STATE_PENDING (element) == GST_STATE_READY) {
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/* otherwise (READY or higher) we need to open the file */
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gst_queue_flush (queue);
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}
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/* if we haven't failed already, give the parent class a chance to ;-) */
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if (GST_ELEMENT_CLASS (parent_class)->change_state)
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return GST_ELEMENT_CLASS (parent_class)->change_state (element);
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return GST_STATE_SUCCESS;
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}
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static void
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gst_queue_set_arg (GtkObject *object, GtkArg *arg, guint id)
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{
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GstQueue *queue;
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail (GST_IS_QUEUE (object));
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queue = GST_QUEUE (object);
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switch(id) {
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case ARG_MAX_LEVEL:
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queue->max_buffers = GTK_VALUE_INT (*arg);
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break;
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case ARG_BLOCK:
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queue->block = GTK_VALUE_BOOL (*arg);
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break;
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default:
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break;
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}
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}
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static void
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gst_queue_get_arg (GtkObject *object, GtkArg *arg, guint id)
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{
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GstQueue *queue;
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail (GST_IS_QUEUE (object));
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queue = GST_QUEUE (object);
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switch (id) {
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case ARG_LEVEL:
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GTK_VALUE_INT (*arg) = queue->level_buffers;
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break;
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case ARG_MAX_LEVEL:
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GTK_VALUE_INT (*arg) = queue->max_buffers;
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break;
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case ARG_BLOCK:
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GTK_VALUE_BOOL (*arg) = queue->block;
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break;
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default:
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arg->type = GTK_TYPE_INVALID;
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break;
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}
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}
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