/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * * gstqueue.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. */ //#define DEBUG_ENABLED //#define STATUS_ENABLED #ifdef STATUS_ENABLED #define STATUS(A) GST_DEBUG(GST_CAT_DATAFLOW, A, GST_ELEMENT_NAME(queue)) #else #define STATUS(A) #endif #include #include "config.h" #include "gst_private.h" #include "gstqueue.h" #include "gstscheduler.h" GstElementDetails gst_queue_details = { "Queue", "Connection", "Simple data queue", VERSION, "Erik Walthinsen ", "(C) 1999", }; /* Queue signals and args */ enum { LOW_WATERMARK, HIGH_WATERMARK, LAST_SIGNAL }; enum { ARG_0, ARG_LEVEL_BUFFERS, ARG_LEVEL_BYTES, ARG_LEVEL_TIME, ARG_SIZE_BUFFERS, ARG_SIZE_BYTES, ARG_SIZE_TIME, ARG_LEAKY, ARG_LEVEL, ARG_MAX_LEVEL, }; static void gst_queue_class_init (GstQueueClass *klass); static void gst_queue_init (GstQueue *queue); static void gst_queue_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void gst_queue_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); static GstPadNegotiateReturn gst_queue_handle_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data); static GstPadNegotiateReturn gst_queue_handle_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data); static void gst_queue_chain (GstPad *pad, GstBuffer *buf); static GstBuffer * gst_queue_get (GstPad *pad); static GstBufferPool* gst_queue_get_bufferpool (GstPad *pad); static void gst_queue_locked_flush (GstQueue *queue); static void gst_queue_flush (GstQueue *queue); static GstElementStateReturn gst_queue_change_state (GstElement *element); #define GST_TYPE_QUEUE_LEAKY (queue_leaky_get_type()) static GType queue_leaky_get_type(void) { static GType queue_leaky_type = 0; static GEnumValue queue_leaky[] = { { GST_QUEUE_NO_LEAK, "0", "Not Leaky" }, { GST_QUEUE_LEAK_UPSTREAM, "1", "Leaky on Upstream" }, { GST_QUEUE_LEAK_DOWNSTREAM, "2", "Leaky on Downstream" }, { 0, NULL, NULL }, }; if (!queue_leaky_type) { queue_leaky_type = g_enum_register_static("GstQueueLeaky", queue_leaky); } return queue_leaky_type; } static GstElementClass *parent_class = NULL; //static guint gst_queue_signals[LAST_SIGNAL] = { 0 }; GType gst_queue_get_type(void) { static GType queue_type = 0; if (!queue_type) { static const GTypeInfo queue_info = { sizeof(GstQueueClass), NULL, NULL, (GClassInitFunc)gst_queue_class_init, NULL, NULL, sizeof(GstQueue), 4, (GInstanceInitFunc)gst_queue_init, NULL }; queue_type = g_type_register_static (GST_TYPE_ELEMENT, "GstQueue", &queue_info, 0); } return queue_type; } static void gst_queue_class_init (GstQueueClass *klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass*)klass; gstelement_class = (GstElementClass*)klass; parent_class = g_type_class_ref (GST_TYPE_ELEMENT); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_LEAKY, g_param_spec_enum("leaky","Leaky","Where the queue leaks, if at all.", GST_TYPE_QUEUE_LEAKY,GST_QUEUE_NO_LEAK,G_PARAM_READWRITE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_LEVEL, g_param_spec_int("level","Level","How many buffers are in the queue.", 0,G_MAXINT,0,G_PARAM_READABLE)); g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_MAX_LEVEL, g_param_spec_int("max_level","Maximum Level","How many buffers the queue holds.", 0,G_MAXINT,100,G_PARAM_READWRITE)); gobject_class->set_property = GST_DEBUG_FUNCPTR(gst_queue_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR(gst_queue_get_property); gstelement_class->change_state = GST_DEBUG_FUNCPTR(gst_queue_change_state); } static void gst_queue_init (GstQueue *queue) { // scheduling on this kind of element is, well, interesting GST_FLAG_SET (queue, GST_ELEMENT_DECOUPLED); GST_FLAG_SET (queue, GST_ELEMENT_EVENT_AWARE); queue->sinkpad = gst_pad_new ("sink", GST_PAD_SINK); gst_pad_set_chain_function (queue->sinkpad, GST_DEBUG_FUNCPTR(gst_queue_chain)); gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad); gst_pad_set_negotiate_function (queue->sinkpad, GST_DEBUG_FUNCPTR(gst_queue_handle_negotiate_sink)); gst_pad_set_bufferpool_function (queue->sinkpad, GST_DEBUG_FUNCPTR(gst_queue_get_bufferpool)); queue->srcpad = gst_pad_new ("src", GST_PAD_SRC); gst_pad_set_get_function (queue->srcpad, GST_DEBUG_FUNCPTR(gst_queue_get)); gst_element_add_pad (GST_ELEMENT (queue), queue->srcpad); gst_pad_set_negotiate_function (queue->srcpad, GST_DEBUG_FUNCPTR(gst_queue_handle_negotiate_src)); queue->queue = NULL; queue->level_buffers = 0; queue->level_bytes = 0; queue->level_time = 0LL; queue->size_buffers = 100; // 100 buffers queue->size_bytes = 100 * 1024; // 100KB queue->size_time = 1000000000LL; // 1sec queue->qlock = g_mutex_new (); queue->reader = FALSE; queue->writer = FALSE; queue->not_empty = g_cond_new (); queue->not_full = g_cond_new (); GST_DEBUG_ELEMENT (GST_CAT_THREAD, queue, "initialized queue's not_empty & not_full conditions\n"); } static GstBufferPool* gst_queue_get_bufferpool (GstPad *pad) { GstQueue *queue; queue = GST_QUEUE (GST_OBJECT_PARENT (pad)); return gst_pad_get_bufferpool (queue->srcpad); } static GstPadNegotiateReturn gst_queue_handle_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data) { GstQueue *queue; queue = GST_QUEUE (GST_OBJECT_PARENT (pad)); return gst_pad_negotiate_proxy (pad, queue->sinkpad, caps); } static GstPadNegotiateReturn gst_queue_handle_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data) { GstQueue *queue; queue = GST_QUEUE (GST_OBJECT_PARENT (pad)); return gst_pad_negotiate_proxy (pad, queue->srcpad, caps); } static void gst_queue_cleanup_buffers (gpointer data, const gpointer user_data) { GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, user_data, "cleaning buffer %p\n", data); if (GST_IS_BUFFER (data)) { gst_buffer_unref (GST_BUFFER (data)); } } static void gst_queue_locked_flush (GstQueue *queue) { g_slist_foreach (queue->queue, gst_queue_cleanup_buffers, (gpointer) queue); g_slist_free (queue->queue); queue->queue = NULL; queue->level_buffers = 0; queue->timeval = NULL; } static void gst_queue_flush (GstQueue *queue) { g_mutex_lock (queue->qlock); gst_queue_locked_flush (queue); g_mutex_unlock (queue->qlock); } static void gst_queue_chain (GstPad *pad, GstBuffer *buf) { GstQueue *queue; gboolean reader; g_return_if_fail (pad != NULL); g_return_if_fail (GST_IS_PAD (pad)); g_return_if_fail (buf != NULL); queue = GST_QUEUE (GST_OBJECT_PARENT (pad)); reader = FALSE; /* we have to lock the queue since we span threads */ GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "locking t:%ld\n", pthread_self ()); g_mutex_lock (queue->qlock); GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "locked t:%ld\n", pthread_self ()); if (GST_IS_EVENT (buf)) { switch (GST_EVENT_TYPE (buf)) { case GST_EVENT_FLUSH: GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "FLUSH event, flushing queue\n"); gst_queue_locked_flush (queue); break; case GST_EVENT_EOS: break; default: gst_pad_event_default (pad, GST_EVENT (buf)); break; } } GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "adding buffer %p of size %d\n",buf,GST_BUFFER_SIZE(buf)); if (queue->level_buffers == queue->size_buffers) { // if this is a leaky queue... if (queue->leaky) { // FIXME don't want to leak events! // if we leak on the upstream side, drop the current buffer if (queue->leaky == GST_QUEUE_LEAK_UPSTREAM) { GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "queue is full, leaking buffer on upstream end\n"); if (GST_IS_EVENT (buf)) fprintf(stderr, "Error: queue [%s] leaked an event, type:%d\n", GST_ELEMENT_NAME(GST_ELEMENT(queue)), GST_EVENT_TYPE(GST_EVENT(buf))); GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "queue is full, leaking buffer on upstream end\n"); gst_buffer_unref(buf); // now we have to clean up and exit right away g_mutex_unlock (queue->qlock); return; } // otherwise we have to push a buffer off the other end else { GSList *front; GstBuffer *leakbuf; GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "queue is full, leaking buffer on downstream end\n"); front = queue->queue; leakbuf = (GstBuffer *)(front->data); if (GST_IS_EVENT (leakbuf)) fprintf(stderr, "Error: queue [%s] leaked an event, type:%d\n", GST_ELEMENT_NAME(GST_ELEMENT(queue)), GST_EVENT_TYPE(GST_EVENT(leakbuf))); queue->level_buffers--; queue->level_bytes -= GST_BUFFER_SIZE(leakbuf); gst_buffer_unref(leakbuf); queue->queue = g_slist_remove_link (queue->queue, front); g_slist_free (front); } } GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "pre full wait, level:%d/%d\n", queue->level_buffers, queue->size_buffers); while (queue->level_buffers == queue->size_buffers) { // if there's a pending state change for this queue or its manager, switch // back to iterator so bottom half of state change executes if (GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING || // GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING) GST_STATE_PENDING(GST_SCHED_PARENT(GST_ELEMENT_SCHED(GST_PAD_PARENT(GST_PAD_PEER(queue->sinkpad))))) != GST_STATE_VOID_PENDING) { GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "interrupted!!\n"); if (GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING) GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING)\n"); if (GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING) GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING\n"); g_mutex_unlock (queue->qlock); cothread_switch(cothread_current_main()); } GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "waiting for not_full, level:%d/%d\n", queue->level_buffers, queue->size_buffers); if (queue->writer) GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "WARNING: multiple writers on queue!\n"); queue->writer = TRUE; g_cond_wait (queue->not_full, queue->qlock); queue->writer = FALSE; GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "got not_full signal\n"); } GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "post full wait, level:%d/%d\n", queue->level_buffers, queue->size_buffers); } /* put the buffer on the tail of the list */ queue->queue = g_slist_append (queue->queue, buf); queue->level_buffers++; queue->level_bytes += GST_BUFFER_SIZE(buf); GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "(%s:%s)+ level:%d/%d\n", GST_DEBUG_PAD_NAME(pad), queue->level_buffers, queue->size_buffers); /* reader waiting on an empty queue */ reader = queue->reader; g_mutex_unlock (queue->qlock); if (reader) { GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "signalling not_empty\n"); g_cond_signal (queue->not_empty); } } static GstBuffer * gst_queue_get (GstPad *pad) { GstQueue *queue; GstBuffer *buf = NULL; GSList *front; gboolean writer; g_assert(pad != NULL); g_assert(GST_IS_PAD(pad)); g_return_val_if_fail (pad != NULL, NULL); g_return_val_if_fail (GST_IS_PAD (pad), NULL); queue = GST_QUEUE (GST_OBJECT_PARENT (pad)); writer = FALSE; /* have to lock for thread-safety */ GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "locking t:%ld\n", pthread_self ()); g_mutex_lock (queue->qlock); GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "locked t:%ld %p\n", pthread_self (), queue->not_empty); GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "pre empty wait, level:%d/%d\n", queue->level_buffers, queue->size_buffers); while (queue->level_buffers == 0) { // if there's a pending state change for this queue or its manager, switch // back to iterator so bottom half of state change executes if (GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING || // GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING) GST_STATE_PENDING(GST_SCHED_PARENT(GST_ELEMENT_SCHED(GST_PAD_PARENT(GST_PAD_PEER(queue->srcpad))))) != GST_STATE_VOID_PENDING) { GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "interrupted!!\n"); if (GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING) GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING)\n"); if (GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING) GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING\n"); g_mutex_unlock (queue->qlock); cothread_switch(cothread_current_main()); } GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "waiting for not_empty, level:%d/%d\n", queue->level_buffers, queue->size_buffers); if (queue->reader) GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "WARNING: multiple readers on queue!\n"); queue->reader = TRUE; g_cond_wait (queue->not_empty, queue->qlock); queue->reader = FALSE; GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "got not_empty signal\n"); } GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "post empty wait, level:%d/%d\n", queue->level_buffers, queue->size_buffers); front = queue->queue; buf = (GstBuffer *)(front->data); GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "retrieved buffer %p from queue\n", buf); queue->queue = g_slist_remove_link (queue->queue, front); g_slist_free (front); queue->level_buffers--; queue->level_bytes -= GST_BUFFER_SIZE(buf); GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "(%s:%s)- level:%d/%d\n", GST_DEBUG_PAD_NAME(pad), queue->level_buffers, queue->size_buffers); /* writer waiting on a full queue */ writer = queue->writer; g_mutex_unlock (queue->qlock); if (writer) { GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "signalling not_full\n"); g_cond_signal (queue->not_full); } // FIXME where should this be? locked? if (GST_IS_EVENT(buf)) { GstEvent *event = GST_EVENT(buf); switch (GST_EVENT_TYPE(event)) { case GST_EVENT_EOS: GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "queue eos\n"); gst_element_set_state (GST_ELEMENT (queue), GST_STATE_PAUSED); break; default: break; } } return buf; } static GstElementStateReturn gst_queue_change_state (GstElement *element) { GstQueue *queue; GstElementStateReturn ret; g_return_val_if_fail (GST_IS_QUEUE (element), GST_STATE_FAILURE); queue = GST_QUEUE (element); // lock the queue so another thread (not in sync with this thread's state) // can't call this queue's _get (or whatever) GST_LOCK (queue); /* if going down into NULL state, clear out buffers*/ if (GST_STATE_PENDING (element) == GST_STATE_READY) { /* otherwise (READY or higher) we need to open the file */ gst_queue_flush (queue); } // if we haven't failed already, give the parent class a chance to ;-) if (GST_ELEMENT_CLASS (parent_class)->change_state) { gboolean valid_handler = FALSE; guint state_change_id = g_signal_lookup("state_change", G_OBJECT_TYPE(element)); // determine whether we need to block the parent (element) class' // STATE_CHANGE signal so we can UNLOCK before returning. we block // it if we could find the state_change signal AND there's a signal // handler attached to it. // // note: this assumes that change_state() *only* emits state_change signal. // if element change_state() emits other signals, they need to be blocked // as well. if (state_change_id && g_signal_has_handler_pending(G_OBJECT(element), state_change_id, 0, FALSE)) valid_handler = TRUE; if (valid_handler) g_signal_handler_block(G_OBJECT(element), state_change_id); ret = GST_ELEMENT_CLASS (parent_class)->change_state (element); if (valid_handler) g_signal_handler_unblock(G_OBJECT(element), state_change_id); // UNLOCK, *then* emit signal (if there's one there) GST_UNLOCK(queue); if (valid_handler) g_signal_emit(G_OBJECT (element), state_change_id, 0, GST_STATE(element)); } else { ret = GST_STATE_SUCCESS; GST_UNLOCK(queue); } return ret; } static void gst_queue_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GstQueue *queue; /* it's not null if we got it, but it might not be ours */ g_return_if_fail (GST_IS_QUEUE (object)); queue = GST_QUEUE (object); switch (prop_id) { case ARG_LEAKY: queue->leaky = g_value_get_int(value); break; case ARG_MAX_LEVEL: queue->size_buffers = g_value_get_int(value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_queue_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GstQueue *queue; /* it's not null if we got it, but it might not be ours */ g_return_if_fail (GST_IS_QUEUE (object)); queue = GST_QUEUE (object); switch (prop_id) { case ARG_LEAKY: g_value_set_int(value, queue->leaky); break; case ARG_LEVEL: g_value_set_int(value, queue->level_buffers); break; case ARG_MAX_LEVEL: g_value_set_int(value, queue->size_buffers); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } }