mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-25 19:21:06 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst/playback/gstqueue2.c
Mark Nauwelaerts ff998f24db queue2: post error message when pausing task if so appropriate 
If a downstream element returns an error while upstream has already
put all data into queue2 (including EOS), upstream will no longer
chain into queue2, so it is up to queue2 to perform some
EOS handling / message posting in such cases.  See #589991.
2009-08-06 13:39:19 +02:00

2204 lines
66 KiB
C
Raw Blame History

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2003 Colin Walters <cwalters@gnome.org>
* 2000,2005,2007 Wim Taymans <wim.taymans@gmail.com>
* 2007 Thiago Sousa Santos <thiagoss@lcc.ufcg.edu.br>
*
* gstqueue2.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:element-queue2
* @short_description: Asynchronous data queue.
*
* Data is queued until one of the limits specified by the
* #GstQueue2:max-size-buffers, #GstQueue2:max-size-bytes and/or
* #GstQueue2:max-size-time properties has been reached. Any attempt to push
* more buffers into the queue will block the pushing thread until more space
* becomes available.
*
* The queue will create a new thread on the source pad to decouple the
* processing on sink and source pad.
*
* You can query how many buffers are queued by reading the
* #GstQueue2:current-level-buffers property.
*
* The default queue size limits are 100 buffers, 2MB of data, or
* two seconds worth of data, whichever is reached first.
*
* If you set temp-tmpl to a value such as /tmp/gstreamer-XXXXXX, the element
* will allocate a random free filename and buffer data in the file.
* By using this, it will buffer the entire stream data on the file independently
* of the queue size limits, they will only be used for buffering statistics.
*
* Since 0.10.24, setting the temp-location property with a filename is deprecated
* because it's impossible to securely open a temporary file in this way. The
* property will still be used to notify the application of the allocated
* filename, though.
*
* Last reviewed on 2009-07-10 (0.10.24)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib/gstdio.h>
#include <gst/gst.h>
#include <gst/gst-i18n-plugin.h>
#ifdef G_OS_WIN32
#include <io.h> /* lseek, open, close, read */
#undef lseek
#define lseek _lseeki64
#undef off_t
#define off_t guint64
#else
#include <unistd.h>
#endif
static const GstElementDetails gst_queue_details = GST_ELEMENT_DETAILS ("Queue",
"Generic",
"Simple data queue",
"Erik Walthinsen <omega@cse.ogi.edu>, "
"Wim Taymans <wim.taymans@gmail.com>");
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (queue_debug);
#define GST_CAT_DEFAULT (queue_debug)
GST_DEBUG_CATEGORY_STATIC (queue_dataflow);
enum
{
LAST_SIGNAL
};
/* default property values */
#define DEFAULT_MAX_SIZE_BUFFERS 100 /* 100 buffers */
#define DEFAULT_MAX_SIZE_BYTES (2 * 1024 * 1024) /* 2 MB */
#define DEFAULT_MAX_SIZE_TIME 2 * GST_SECOND /* 2 seconds */
#define DEFAULT_USE_BUFFERING FALSE
#define DEFAULT_USE_RATE_ESTIMATE TRUE
#define DEFAULT_LOW_PERCENT 10
#define DEFAULT_HIGH_PERCENT 99
/* other defines */
#define DEFAULT_BUFFER_SIZE 4096
#define QUEUE_IS_USING_TEMP_FILE(queue) ((queue)->temp_location_set || (queue)->temp_template != NULL)
enum
{
PROP_0,
PROP_CUR_LEVEL_BUFFERS,
PROP_CUR_LEVEL_BYTES,
PROP_CUR_LEVEL_TIME,
PROP_MAX_SIZE_BUFFERS,
PROP_MAX_SIZE_BYTES,
PROP_MAX_SIZE_TIME,
PROP_USE_BUFFERING,
PROP_USE_RATE_ESTIMATE,
PROP_LOW_PERCENT,
PROP_HIGH_PERCENT,
PROP_TEMP_TEMPLATE,
PROP_TEMP_LOCATION
};
#define GST_TYPE_QUEUE \
(gst_queue_get_type())
#define GST_QUEUE(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_QUEUE,GstQueue))
#define GST_QUEUE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_QUEUE,GstQueueClass))
#define GST_IS_QUEUE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_QUEUE))
#define GST_IS_QUEUE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_QUEUE))
#define GST_QUEUE_CAST(obj) \
((GstQueue *)(obj))
typedef struct _GstQueue GstQueue;
typedef struct _GstQueueSize GstQueueSize;
typedef struct _GstQueueClass GstQueueClass;
/* used to keep track of sizes (current and max) */
struct _GstQueueSize
{
guint buffers;
guint bytes;
guint64 time;
guint64 rate_time;
};
#define GST_QUEUE_CLEAR_LEVEL(l) G_STMT_START { \
l.buffers = 0; \
l.bytes = 0; \
l.time = 0; \
l.rate_time = 0; \
} G_STMT_END
struct _GstQueue
{
GstElement element;
/*< private > */
GstPad *sinkpad;
GstPad *srcpad;
/* segments to keep track of timestamps */
GstSegment sink_segment;
GstSegment src_segment;
/* flowreturn when srcpad is paused */
GstFlowReturn srcresult;
gboolean is_eos;
gboolean unexpected;
/* the queue of data we're keeping our hands on */
GQueue *queue;
GstQueueSize cur_level; /* currently in the queue */
GstQueueSize max_level; /* max. amount of data allowed in the queue */
gboolean use_buffering;
gboolean use_rate_estimate;
GstClockTime buffering_interval;
gint low_percent; /* low/high watermarks for buffering */
gint high_percent;
/* current buffering state */
gboolean is_buffering;
guint buffering_iteration;
/* for measuring input/output rates */
GTimer *in_timer;
gboolean in_timer_started;
gdouble last_in_elapsed;
guint64 bytes_in;
gdouble byte_in_rate;
GTimer *out_timer;
gboolean out_timer_started;
gdouble last_out_elapsed;
guint64 bytes_out;
gdouble byte_out_rate;
GMutex *qlock; /* lock for queue (vs object lock) */
gboolean waiting_add;
GCond *item_add; /* signals buffers now available for reading */
gboolean waiting_del;
GCond *item_del; /* signals space now available for writing */
/* temp location stuff */
gchar *temp_template;
gboolean temp_location_set;
gchar *temp_location;
FILE *temp_file;
guint64 writing_pos;
guint64 reading_pos;
guint64 max_reading_pos;
/* we need this to send the first new segment event of the stream
* because we can't save it on the file */
gboolean segment_event_received;
GstEvent *starting_segment;
};
struct _GstQueueClass
{
GstElementClass parent_class;
};
#define STATUS(queue, pad, msg) \
GST_CAT_LOG_OBJECT (queue_dataflow, queue, \
"(%s:%s) " msg ": %u of %u buffers, %u of %u " \
"bytes, %" G_GUINT64_FORMAT " of %" G_GUINT64_FORMAT \
" ns, %"G_GUINT64_FORMAT" items", \
GST_DEBUG_PAD_NAME (pad), \
queue->cur_level.buffers, \
queue->max_level.buffers, \
queue->cur_level.bytes, \
queue->max_level.bytes, \
queue->cur_level.time, \
queue->max_level.time, \
(guint64) (QUEUE_IS_USING_TEMP_FILE(queue) ? \
queue->writing_pos - queue->max_reading_pos : \
queue->queue->length))
#define GST_QUEUE_MUTEX_LOCK(q) G_STMT_START { \
g_mutex_lock (q->qlock); \
} G_STMT_END
#define GST_QUEUE_MUTEX_LOCK_CHECK(q,label) G_STMT_START { \
GST_QUEUE_MUTEX_LOCK (q); \
if (q->srcresult != GST_FLOW_OK) \
goto label; \
} G_STMT_END
#define GST_QUEUE_MUTEX_UNLOCK(q) G_STMT_START { \
g_mutex_unlock (q->qlock); \
} G_STMT_END
#define GST_QUEUE_WAIT_DEL_CHECK(q, label) G_STMT_START { \
STATUS (queue, q->sinkpad, "wait for DEL"); \
q->waiting_del = TRUE; \
g_cond_wait (q->item_del, queue->qlock); \
q->waiting_del = FALSE; \
if (q->srcresult != GST_FLOW_OK) { \
STATUS (queue, q->srcpad, "received DEL wakeup"); \
goto label; \
} \
STATUS (queue, q->sinkpad, "received DEL"); \
} G_STMT_END
#define GST_QUEUE_WAIT_ADD_CHECK(q, label) G_STMT_START { \
STATUS (queue, q->srcpad, "wait for ADD"); \
q->waiting_add = TRUE; \
g_cond_wait (q->item_add, q->qlock); \
q->waiting_add = FALSE; \
if (q->srcresult != GST_FLOW_OK) { \
STATUS (queue, q->srcpad, "received ADD wakeup"); \
goto label; \
} \
STATUS (queue, q->srcpad, "received ADD"); \
} G_STMT_END
#define GST_QUEUE_SIGNAL_DEL(q) G_STMT_START { \
if (q->waiting_del) { \
STATUS (q, q->srcpad, "signal DEL"); \
g_cond_signal (q->item_del); \
} \
} G_STMT_END
#define GST_QUEUE_SIGNAL_ADD(q) G_STMT_START { \
if (q->waiting_add) { \
STATUS (q, q->sinkpad, "signal ADD"); \
g_cond_signal (q->item_add); \
} \
} G_STMT_END
#define _do_init(bla) \
/* can't use boilerplate as we need to register with Queue2 to avoid conflicts
* with queue in core elements */
static void gst_queue_class_init (GstQueueClass * klass);
static void gst_queue_init (GstQueue * queue, GstQueueClass * g_class);
static GstElementClass *parent_class;
static GType
gst_queue_get_type (void)
{
static GType gst_queue_type = 0;
if (!gst_queue_type) {
static const GTypeInfo gst_queue_info = {
sizeof (GstQueueClass),
NULL,
NULL,
(GClassInitFunc) gst_queue_class_init,
NULL,
NULL,
sizeof (GstQueue),
0,
(GInstanceInitFunc) gst_queue_init,
NULL
};
gst_queue_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstQueue2",
&gst_queue_info, 0);
}
return gst_queue_type;
}
static void gst_queue_finalize (GObject * object);
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 GstFlowReturn gst_queue_chain (GstPad * pad, GstBuffer * buffer);
static GstFlowReturn gst_queue_bufferalloc (GstPad * pad, guint64 offset,
guint size, GstCaps * caps, GstBuffer ** buf);
static GstFlowReturn gst_queue_push_one (GstQueue * queue);
static void gst_queue_loop (GstPad * pad);
static gboolean gst_queue_handle_sink_event (GstPad * pad, GstEvent * event);
static gboolean gst_queue_handle_src_event (GstPad * pad, GstEvent * event);
static gboolean gst_queue_handle_src_query (GstPad * pad, GstQuery * query);
static GstCaps *gst_queue_getcaps (GstPad * pad);
static GstFlowReturn gst_queue_get_range (GstPad * pad, guint64 offset,
guint length, GstBuffer ** buffer);
static gboolean gst_queue_src_checkgetrange_function (GstPad * pad);
static gboolean gst_queue_src_activate_pull (GstPad * pad, gboolean active);
static gboolean gst_queue_src_activate_push (GstPad * pad, gboolean active);
static gboolean gst_queue_sink_activate_push (GstPad * pad, gboolean active);
static GstStateChangeReturn gst_queue_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_queue_is_empty (GstQueue * queue);
static gboolean gst_queue_is_filled (GstQueue * queue);
/* static guint gst_queue_signals[LAST_SIGNAL] = { 0 }; */
static void
gst_queue_class_init (GstQueueClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_queue_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_queue_get_property);
/* properties */
g_object_class_install_property (gobject_class, PROP_CUR_LEVEL_BYTES,
g_param_spec_uint ("current-level-bytes", "Current level (kB)",
"Current amount of data in the queue (bytes)",
0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_CUR_LEVEL_BUFFERS,
g_param_spec_uint ("current-level-buffers", "Current level (buffers)",
"Current number of buffers in the queue",
0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_CUR_LEVEL_TIME,
g_param_spec_uint64 ("current-level-time", "Current level (ns)",
"Current amount of data in the queue (in ns)",
0, G_MAXUINT64, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_SIZE_BYTES,
g_param_spec_uint ("max-size-bytes", "Max. size (kB)",
"Max. amount of data in the queue (bytes, 0=disable)",
0, G_MAXUINT, DEFAULT_MAX_SIZE_BYTES,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_SIZE_BUFFERS,
g_param_spec_uint ("max-size-buffers", "Max. size (buffers)",
"Max. number of buffers in the queue (0=disable)", 0, G_MAXUINT,
DEFAULT_MAX_SIZE_BUFFERS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_SIZE_TIME,
g_param_spec_uint64 ("max-size-time", "Max. size (ns)",
"Max. amount of data in the queue (in ns, 0=disable)", 0, G_MAXUINT64,
DEFAULT_MAX_SIZE_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_USE_BUFFERING,
g_param_spec_boolean ("use-buffering", "Use buffering",
"Emit GST_MESSAGE_BUFFERING based on low-/high-percent thresholds",
DEFAULT_USE_BUFFERING, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_USE_RATE_ESTIMATE,
g_param_spec_boolean ("use-rate-estimate", "Use Rate Estimate",
"Estimate the bitrate of the stream to calculate time level",
DEFAULT_USE_RATE_ESTIMATE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_LOW_PERCENT,
g_param_spec_int ("low-percent", "Low percent",
"Low threshold for buffering to start", 0, 100, DEFAULT_LOW_PERCENT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_HIGH_PERCENT,
g_param_spec_int ("high-percent", "High percent",
"High threshold for buffering to finish", 0, 100,
DEFAULT_HIGH_PERCENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_TEMP_TEMPLATE,
g_param_spec_string ("temp-template", "Temporary File Template",
"File template to store temporary files in, should contain directory "
"and XXXXXX. (NULL == disabled)",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_TEMP_LOCATION,
g_param_spec_string ("temp-location", "Temporary File Location",
"Location to store temporary files in (Deprecated: Only read this "
"property, use temp-tmpl to configure the name template)",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&srctemplate));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sinktemplate));
gst_element_class_set_details (gstelement_class, &gst_queue_details);
/* set several parent class virtual functions */
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_queue_finalize);
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_queue_change_state);
}
static void
gst_queue_init (GstQueue * queue, GstQueueClass * g_class)
{
queue->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
gst_pad_set_chain_function (queue->sinkpad,
GST_DEBUG_FUNCPTR (gst_queue_chain));
gst_pad_set_activatepush_function (queue->sinkpad,
GST_DEBUG_FUNCPTR (gst_queue_sink_activate_push));
gst_pad_set_event_function (queue->sinkpad,
GST_DEBUG_FUNCPTR (gst_queue_handle_sink_event));
gst_pad_set_getcaps_function (queue->sinkpad,
GST_DEBUG_FUNCPTR (gst_queue_getcaps));
gst_pad_set_bufferalloc_function (queue->sinkpad,
GST_DEBUG_FUNCPTR (gst_queue_bufferalloc));
gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad);
queue->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
gst_pad_set_activatepull_function (queue->srcpad,
GST_DEBUG_FUNCPTR (gst_queue_src_activate_pull));
gst_pad_set_activatepush_function (queue->srcpad,
GST_DEBUG_FUNCPTR (gst_queue_src_activate_push));
gst_pad_set_getrange_function (queue->srcpad,
GST_DEBUG_FUNCPTR (gst_queue_get_range));
gst_pad_set_checkgetrange_function (queue->srcpad,
GST_DEBUG_FUNCPTR (gst_queue_src_checkgetrange_function));
gst_pad_set_getcaps_function (queue->srcpad,
GST_DEBUG_FUNCPTR (gst_queue_getcaps));
gst_pad_set_event_function (queue->srcpad,
GST_DEBUG_FUNCPTR (gst_queue_handle_src_event));
gst_pad_set_query_function (queue->srcpad,
GST_DEBUG_FUNCPTR (gst_queue_handle_src_query));
gst_element_add_pad (GST_ELEMENT (queue), queue->srcpad);
/* levels */
GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
queue->max_level.buffers = DEFAULT_MAX_SIZE_BUFFERS;
queue->max_level.bytes = DEFAULT_MAX_SIZE_BYTES;
queue->max_level.time = DEFAULT_MAX_SIZE_TIME;
queue->max_level.rate_time = DEFAULT_MAX_SIZE_TIME;
queue->use_buffering = DEFAULT_USE_BUFFERING;
queue->use_rate_estimate = DEFAULT_USE_RATE_ESTIMATE;
queue->low_percent = DEFAULT_LOW_PERCENT;
queue->high_percent = DEFAULT_HIGH_PERCENT;
gst_segment_init (&queue->sink_segment, GST_FORMAT_TIME);
gst_segment_init (&queue->src_segment, GST_FORMAT_TIME);
queue->srcresult = GST_FLOW_WRONG_STATE;
queue->is_eos = FALSE;
queue->in_timer = g_timer_new ();
queue->out_timer = g_timer_new ();
queue->qlock = g_mutex_new ();
queue->waiting_add = FALSE;
queue->item_add = g_cond_new ();
queue->waiting_del = FALSE;
queue->item_del = g_cond_new ();
queue->queue = g_queue_new ();
/* tempfile related */
queue->temp_template = NULL;
queue->temp_location = NULL;
queue->temp_location_set = FALSE;
GST_DEBUG_OBJECT (queue,
"initialized queue's not_empty & not_full conditions");
}
/* called only once, as opposed to dispose */
static void
gst_queue_finalize (GObject * object)
{
GstQueue *queue = GST_QUEUE (object);
GST_DEBUG_OBJECT (queue, "finalizing queue");
while (!g_queue_is_empty (queue->queue)) {
GstMiniObject *data = g_queue_pop_head (queue->queue);
gst_mini_object_unref (data);
}
g_queue_free (queue->queue);
g_mutex_free (queue->qlock);
g_cond_free (queue->item_add);
g_cond_free (queue->item_del);
g_timer_destroy (queue->in_timer);
g_timer_destroy (queue->out_timer);
/* temp_file path cleanup */
g_free (queue->temp_template);
g_free (queue->temp_location);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstCaps *
gst_queue_getcaps (GstPad * pad)
{
GstQueue *queue;
GstPad *otherpad;
GstCaps *result;
queue = GST_QUEUE (GST_PAD_PARENT (pad));
otherpad = (pad == queue->srcpad ? queue->sinkpad : queue->srcpad);
result = gst_pad_peer_get_caps (otherpad);
if (result == NULL)
result = gst_caps_new_any ();
return result;
}
static GstFlowReturn
gst_queue_bufferalloc (GstPad * pad, guint64 offset, guint size, GstCaps * caps,
GstBuffer ** buf)
{
GstQueue *queue;
GstFlowReturn result;
queue = GST_QUEUE (GST_PAD_PARENT (pad));
/* Forward to src pad, without setting caps on the src pad */
result = gst_pad_alloc_buffer (queue->srcpad, offset, size, caps, buf);
return result;
}
/* calculate the diff between running time on the sink and src of the queue.
* This is the total amount of time in the queue. */
static void
update_time_level (GstQueue * queue)
{
gint64 sink_time, src_time;
sink_time =
gst_segment_to_running_time (&queue->sink_segment, GST_FORMAT_TIME,
queue->sink_segment.last_stop);
src_time = gst_segment_to_running_time (&queue->src_segment, GST_FORMAT_TIME,
queue->src_segment.last_stop);
GST_DEBUG_OBJECT (queue, "sink %" GST_TIME_FORMAT ", src %" GST_TIME_FORMAT,
GST_TIME_ARGS (sink_time), GST_TIME_ARGS (src_time));
if (sink_time >= src_time)
queue->cur_level.time = sink_time - src_time;
else
queue->cur_level.time = 0;
}
/* take a NEWSEGMENT event and apply the values to segment, updating the time
* level of queue. */
static void
apply_segment (GstQueue * queue, GstEvent * event, GstSegment * segment)
{
gboolean update;
GstFormat format;
gdouble rate, arate;
gint64 start, stop, time;
gst_event_parse_new_segment_full (event, &update, &rate, &arate,
&format, &start, &stop, &time);
GST_DEBUG_OBJECT (queue,
"received NEWSEGMENT update %d, rate %lf, applied rate %lf, "
"format %d, "
"%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
G_GINT64_FORMAT, update, rate, arate, format, start, stop, time);
if (format == GST_FORMAT_BYTES) {
}
/* now configure the values, we use these to track timestamps on the
* sinkpad. */
if (format != GST_FORMAT_TIME) {
/* non-time format, pretent the current time segment is closed with a
* 0 start and unknown stop time. */
update = FALSE;
format = GST_FORMAT_TIME;
start = 0;
stop = -1;
time = 0;
}
gst_segment_set_newsegment_full (segment, update,
rate, arate, format, start, stop, time);
GST_DEBUG_OBJECT (queue,
"configured NEWSEGMENT %" GST_SEGMENT_FORMAT, segment);
/* segment can update the time level of the queue */
update_time_level (queue);
}
/* take a buffer and update segment, updating the time level of the queue. */
static void
apply_buffer (GstQueue * queue, GstBuffer * buffer, GstSegment * segment)
{
GstClockTime duration, timestamp;
timestamp = GST_BUFFER_TIMESTAMP (buffer);
duration = GST_BUFFER_DURATION (buffer);
/* if no timestamp is set, assume it's continuous with the previous
* time */
if (timestamp == GST_CLOCK_TIME_NONE)
timestamp = segment->last_stop;
/* add duration */
if (duration != GST_CLOCK_TIME_NONE)
timestamp += duration;
GST_DEBUG_OBJECT (queue, "last_stop updated to %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
gst_segment_set_last_stop (segment, GST_FORMAT_TIME, timestamp);
/* calc diff with other end */
update_time_level (queue);
}
static void
update_buffering (GstQueue * queue)
{
gint percent;
gboolean post = FALSE;
if (!queue->use_buffering || queue->high_percent <= 0)
return;
#define GET_PERCENT(format) ((queue->max_level.format) > 0 ? \
(queue->cur_level.format) * 100 / (queue->max_level.format) : 0)
if (queue->is_eos) {
/* on EOS we are always 100% full, we set the var here so that it we can
* resue the logic below to stop buffering */
percent = 100;
} else {
/* figure out the percent we are filled, we take the max of all formats. */
percent = GET_PERCENT (bytes);
percent = MAX (percent, GET_PERCENT (time));
percent = MAX (percent, GET_PERCENT (buffers));
/* also apply the rate estimate when we need to */
if (queue->use_rate_estimate)
percent = MAX (percent, GET_PERCENT (rate_time));
}
if (queue->is_buffering) {
post = TRUE;
/* if we were buffering see if we reached the high watermark */
if (percent >= queue->high_percent)
queue->is_buffering = FALSE;
} else {
/* we were not buffering, check if we need to start buffering if we drop
* below the low threshold */
if (percent < queue->low_percent) {
queue->is_buffering = TRUE;
queue->buffering_iteration++;
post = TRUE;
}
}
if (post) {
GstMessage *message;
GstBufferingMode mode;
/* scale to high percent so that it becomes the 100% mark */
percent = percent * 100 / queue->high_percent;
/* clip */
if (percent > 100)
percent = 100;
if (QUEUE_IS_USING_TEMP_FILE (queue))
mode = GST_BUFFERING_DOWNLOAD;
else
mode = GST_BUFFERING_STREAM;
GST_DEBUG_OBJECT (queue, "buffering %d percent", percent);
message = gst_message_new_buffering (GST_OBJECT_CAST (queue), percent);
gst_message_set_buffering_stats (message, mode,
queue->byte_in_rate, queue->byte_out_rate, -1);
gst_element_post_message (GST_ELEMENT_CAST (queue), message);
} else {
GST_DEBUG_OBJECT (queue, "filled %d percent", percent);
}
#undef GET_PERCENT
}
static void
reset_rate_timer (GstQueue * queue)
{
queue->bytes_in = 0;
queue->bytes_out = 0;
queue->byte_in_rate = 0.0;
queue->byte_out_rate = 0.0;
queue->last_in_elapsed = 0.0;
queue->last_out_elapsed = 0.0;
queue->in_timer_started = FALSE;
queue->out_timer_started = FALSE;
}
/* the interval in seconds to recalculate the rate */
#define RATE_INTERVAL 0.2
/* Tuning for rate estimation. We use a large window for the input rate because
* it should be stable when connected to a network. The output rate is less
* stable (the elements preroll, queues behind a demuxer fill, ...) and should
* therefore adapt more quickly. */
#define AVG_IN(avg,val) ((avg) * 15.0 + (val)) / 16.0
#define AVG_OUT(avg,val) ((avg) * 3.0 + (val)) / 4.0
static void
update_in_rates (GstQueue * queue)
{
gdouble elapsed, period;
gdouble byte_in_rate;
if (!queue->in_timer_started) {
queue->in_timer_started = TRUE;
g_timer_start (queue->in_timer);
return;
}
elapsed = g_timer_elapsed (queue->in_timer, NULL);
/* recalc after each interval. */
if (queue->last_in_elapsed + RATE_INTERVAL < elapsed) {
period = elapsed - queue->last_in_elapsed;
GST_DEBUG_OBJECT (queue,
"rates: period %f, in %" G_GUINT64_FORMAT, period, queue->bytes_in);
byte_in_rate = queue->bytes_in / period;
if (queue->byte_in_rate == 0.0)
queue->byte_in_rate = byte_in_rate;
else
queue->byte_in_rate = AVG_IN (queue->byte_in_rate, byte_in_rate);
/* reset the values to calculate rate over the next interval */
queue->last_in_elapsed = elapsed;
queue->bytes_in = 0;
}
if (queue->byte_in_rate > 0.0) {
queue->cur_level.rate_time =
queue->cur_level.bytes / queue->byte_in_rate * GST_SECOND;
}
GST_DEBUG_OBJECT (queue, "rates: in %f, time %" GST_TIME_FORMAT,
queue->byte_in_rate, GST_TIME_ARGS (queue->cur_level.rate_time));
}
static void
update_out_rates (GstQueue * queue)
{
gdouble elapsed, period;
gdouble byte_out_rate;
if (!queue->out_timer_started) {
queue->out_timer_started = TRUE;
g_timer_start (queue->out_timer);
return;
}
elapsed = g_timer_elapsed (queue->out_timer, NULL);
/* recalc after each interval. */
if (queue->last_out_elapsed + RATE_INTERVAL < elapsed) {
period = elapsed - queue->last_out_elapsed;
GST_DEBUG_OBJECT (queue,
"rates: period %f, out %" G_GUINT64_FORMAT, period, queue->bytes_out);
byte_out_rate = queue->bytes_out / period;
if (queue->byte_out_rate == 0.0)
queue->byte_out_rate = byte_out_rate;
else
queue->byte_out_rate = AVG_OUT (queue->byte_out_rate, byte_out_rate);
/* reset the values to calculate rate over the next interval */
queue->last_out_elapsed = elapsed;
queue->bytes_out = 0;
}
if (queue->byte_in_rate > 0.0) {
queue->cur_level.rate_time =
queue->cur_level.bytes / queue->byte_in_rate * GST_SECOND;
}
GST_DEBUG_OBJECT (queue, "rates: out %f, time %" GST_TIME_FORMAT,
queue->byte_out_rate, GST_TIME_ARGS (queue->cur_level.rate_time));
}
static void
gst_queue_write_buffer_to_file (GstQueue * queue, GstBuffer * buffer)
{
guint size;
guint8 *data;
int ret;
#ifdef HAVE_FSEEKO
fseeko (queue->temp_file, (off_t) queue->writing_pos, SEEK_SET);
#elif defined (G_OS_UNIX) || defined (G_OS_WIN32)
lseek (fileno (queue->temp_file), (off_t) queue->writing_pos, SEEK_SET);
#else
fseek (queue->temp_file, queue->writing_pos, SEEK_SET);
#endif
data = GST_BUFFER_DATA (buffer);
size = GST_BUFFER_SIZE (buffer);
ret = fwrite (data, 1, size, queue->temp_file);
if (ret < size) {
/* FIXME do something useful here */
GST_ERROR_OBJECT (queue, "fwrite returned error");
}
queue->writing_pos += size;
if (queue->writing_pos > queue->max_reading_pos)
queue->cur_level.bytes = queue->writing_pos - queue->max_reading_pos;
else
queue->cur_level.bytes = 0;
}
/* see if there is enough data in the file to read a full buffer */
static gboolean
gst_queue_have_data (GstQueue * queue, guint64 offset, guint length)
{
GST_DEBUG_OBJECT (queue,
"offset %" G_GUINT64_FORMAT ", len %u, write %" G_GUINT64_FORMAT, offset,
length, queue->writing_pos);
if (queue->is_eos)
return TRUE;
if (offset + length < queue->writing_pos)
return TRUE;
return FALSE;
}
static GstFlowReturn
gst_queue_create_read (GstQueue * queue, guint64 offset, guint length,
GstBuffer ** buffer)
{
size_t res;
GstBuffer *buf;
/* check if we have enough data at @offset. If there is not enough data, we
* block and wait. */
while (!gst_queue_have_data (queue, offset, length)) {
GST_QUEUE_WAIT_ADD_CHECK (queue, out_flushing);
}
#ifdef HAVE_FSEEKO
if (fseeko (queue->temp_file, (off_t) offset, SEEK_SET) != 0)
goto seek_failed;
#elif defined (G_OS_UNIX) || defined (G_OS_WIN32)
if (lseek (fileno (queue->temp_file), (off_t) offset,
SEEK_SET) == (off_t) - 1)
goto seek_failed;
#else
if (fseek (queue->temp_file, (long) offset, SEEK_SET) != 0)
goto seek_failed;
#endif
buf = gst_buffer_new_and_alloc (length);
/* this should not block */
GST_LOG_OBJECT (queue, "Reading %d bytes", length);
res = fread (GST_BUFFER_DATA (buf), 1, length, queue->temp_file);
GST_LOG_OBJECT (queue, "read %" G_GSIZE_FORMAT " bytes", res);
if (G_UNLIKELY (res == 0)) {
/* check for errors or EOF */
if (ferror (queue->temp_file))
goto could_not_read;
if (feof (queue->temp_file) && length > 0)
goto eos;
}
length = res;
GST_BUFFER_SIZE (buf) = length;
GST_BUFFER_OFFSET (buf) = offset;
GST_BUFFER_OFFSET_END (buf) = offset + length;
*buffer = buf;
queue->reading_pos = offset + length;
queue->max_reading_pos = MAX (queue->max_reading_pos, queue->reading_pos);
if (queue->writing_pos > queue->max_reading_pos)
queue->cur_level.bytes = queue->writing_pos - queue->max_reading_pos;
else
queue->cur_level.bytes = 0;
return GST_FLOW_OK;
/* ERRORS */
out_flushing:
{
GST_DEBUG_OBJECT (queue, "we are flushing");
return GST_FLOW_WRONG_STATE;
}
seek_failed:
{
GST_ELEMENT_ERROR (queue, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
return GST_FLOW_ERROR;
}
could_not_read:
{
GST_ELEMENT_ERROR (queue, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
eos:
{
GST_DEBUG ("non-regular file hits EOS");
gst_buffer_unref (buf);
return GST_FLOW_UNEXPECTED;
}
}
/* should be called with QUEUE_LOCK */
static GstMiniObject *
gst_queue_read_item_from_file (GstQueue * queue)
{
GstMiniObject *item;
if (queue->starting_segment != NULL) {
item = GST_MINI_OBJECT_CAST (queue->starting_segment);
queue->starting_segment = NULL;
} else {
GstFlowReturn ret;
GstBuffer *buffer;
ret =
gst_queue_create_read (queue, queue->reading_pos, DEFAULT_BUFFER_SIZE,
&buffer);
switch (ret) {
case GST_FLOW_OK:
item = GST_MINI_OBJECT_CAST (buffer);
break;
case GST_FLOW_UNEXPECTED:
item = GST_MINI_OBJECT_CAST (gst_event_new_eos ());
break;
default:
item = NULL;
break;
}
}
return item;
}
static gboolean
gst_queue_open_temp_location_file (GstQueue * queue)
{
gint fd = -1;
gchar *name = NULL;
GST_DEBUG_OBJECT (queue, "opening temp file %s", queue->temp_template);
/* we have two cases:
* - temp_location was set to something !NULL (Deprecated). in this case we
* open the specified filename.
* - temp_template was set, allocate a filename and open that filename
*/
if (!queue->temp_location_set) {
/* nothing to do */
if (queue->temp_template == NULL)
goto no_directory;
/* make copy of the template, we don't want to change this */
name = g_strdup (queue->temp_template);
fd = g_mkstemp (name);
if (fd == -1)
goto mkstemp_failed;
/* open the file for update/writing */
queue->temp_file = fdopen (fd, "wb+");
/* error creating file */
if (queue->temp_file == NULL)
goto open_failed;
g_free (queue->temp_location);
queue->temp_location = name;
g_object_notify (G_OBJECT (queue), "temp-location");
} else {
/* open the file for update/writing, this is deprecated but we still need to
* support it for API/ABI compatibility */
queue->temp_file = g_fopen (queue->temp_location, "wb+");
/* error creating file */
if (queue->temp_file == NULL)
goto open_failed;
}
queue->writing_pos = 0;
queue->reading_pos = 0;
queue->max_reading_pos = 0;
return TRUE;
/* ERRORS */
no_directory:
{
GST_ELEMENT_ERROR (queue, RESOURCE, NOT_FOUND,
(_("No Temp directory specified.")), (NULL));
return FALSE;
}
mkstemp_failed:
{
GST_ELEMENT_ERROR (queue, RESOURCE, OPEN_READ,
(_("Could not create temp file \"%s\"."), queue->temp_template),
GST_ERROR_SYSTEM);
g_free (name);
return FALSE;
}
open_failed:
{
GST_ELEMENT_ERROR (queue, RESOURCE, OPEN_READ,
(_("Could not open file \"%s\" for reading."), name), GST_ERROR_SYSTEM);
g_free (name);
if (fd != -1)
close (fd);
return FALSE;
}
}
static void
gst_queue_close_temp_location_file (GstQueue * queue)
{
/* nothing to do */
if (queue->temp_file == NULL)
return;
GST_DEBUG_OBJECT (queue, "closing temp file");
/* we don't remove the file so that the application can use it as a cache
* later on */
fflush (queue->temp_file);
fclose (queue->temp_file);
remove (queue->temp_location);
queue->temp_file = NULL;
}
static void
gst_queue_flush_temp_file (GstQueue * queue)
{
if (queue->temp_file == NULL)
return;
GST_DEBUG_OBJECT (queue, "flushing temp file");
queue->temp_file = g_freopen (queue->temp_location, "wb+", queue->temp_file);
queue->writing_pos = 0;
queue->reading_pos = 0;
queue->max_reading_pos = 0;
}
static void
gst_queue_locked_flush (GstQueue * queue)
{
if (QUEUE_IS_USING_TEMP_FILE (queue)) {
gst_queue_flush_temp_file (queue);
} else {
while (!g_queue_is_empty (queue->queue)) {
GstMiniObject *data = g_queue_pop_head (queue->queue);
/* Then lose another reference because we are supposed to destroy that
data when flushing */
gst_mini_object_unref (data);
}
}
GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
gst_segment_init (&queue->sink_segment, GST_FORMAT_TIME);
gst_segment_init (&queue->src_segment, GST_FORMAT_TIME);
if (queue->starting_segment != NULL)
gst_event_unref (queue->starting_segment);
queue->starting_segment = NULL;
queue->segment_event_received = FALSE;
/* we deleted a lot of something */
GST_QUEUE_SIGNAL_DEL (queue);
}
/* enqueue an item an update the level stats */
static void
gst_queue_locked_enqueue (GstQueue * queue, gpointer item)
{
if (GST_IS_BUFFER (item)) {
GstBuffer *buffer;
guint size;
buffer = GST_BUFFER_CAST (item);
size = GST_BUFFER_SIZE (buffer);
/* add buffer to the statistics */
queue->cur_level.buffers++;
queue->cur_level.bytes += size;
queue->bytes_in += size;
/* apply new buffer to segment stats */
apply_buffer (queue, buffer, &queue->sink_segment);
/* update the byterate stats */
update_in_rates (queue);
if (QUEUE_IS_USING_TEMP_FILE (queue)) {
gst_queue_write_buffer_to_file (queue, buffer);
}
} else if (GST_IS_EVENT (item)) {
GstEvent *event;
event = GST_EVENT_CAST (item);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
/* Zero the thresholds, this makes sure the queue is completely
* filled and we can read all data from the queue. */
queue->is_eos = TRUE;
break;
case GST_EVENT_NEWSEGMENT:
apply_segment (queue, event, &queue->sink_segment);
/* This is our first new segment, we hold it
* as we can't save it on the temp file */
if (QUEUE_IS_USING_TEMP_FILE (queue)) {
if (queue->segment_event_received)
goto unexpected_event;
queue->segment_event_received = TRUE;
if (queue->starting_segment != NULL)
gst_event_unref (queue->starting_segment);
queue->starting_segment = event;
item = NULL;
}
/* a new segment allows us to accept more buffers if we got UNEXPECTED
* from downstream */
queue->unexpected = FALSE;
break;
default:
if (QUEUE_IS_USING_TEMP_FILE (queue))
goto unexpected_event;
break;
}
} else {
g_warning ("Unexpected item %p added in queue %s (refcounting problem?)",
item, GST_OBJECT_NAME (queue));
/* we can't really unref since we don't know what it is */
item = NULL;
}
if (item) {
/* update the buffering status */
update_buffering (queue);
if (!QUEUE_IS_USING_TEMP_FILE (queue))
g_queue_push_tail (queue->queue, item);
else
gst_mini_object_unref (GST_MINI_OBJECT_CAST (item));
GST_QUEUE_SIGNAL_ADD (queue);
}
return;
/* ERRORS */
unexpected_event:
{
g_warning
("Unexpected event of kind %s can't be added in temp file of queue %s ",
gst_event_type_get_name (GST_EVENT_TYPE (item)),
GST_OBJECT_NAME (queue));
gst_event_unref (GST_EVENT_CAST (item));
return;
}
}
/* dequeue an item from the queue and update level stats */
static GstMiniObject *
gst_queue_locked_dequeue (GstQueue * queue)
{
GstMiniObject *item;
if (QUEUE_IS_USING_TEMP_FILE (queue))
item = gst_queue_read_item_from_file (queue);
else
item = g_queue_pop_head (queue->queue);
if (item == NULL)
goto no_item;
if (GST_IS_BUFFER (item)) {
GstBuffer *buffer;
guint size;
buffer = GST_BUFFER_CAST (item);
size = GST_BUFFER_SIZE (buffer);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"retrieved buffer %p from queue", buffer);
queue->cur_level.buffers--;
queue->cur_level.bytes -= size;
queue->bytes_out += size;
apply_buffer (queue, buffer, &queue->src_segment);
/* update the byterate stats */
update_out_rates (queue);
/* update the buffering */
update_buffering (queue);
} else if (GST_IS_EVENT (item)) {
GstEvent *event = GST_EVENT_CAST (item);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"retrieved event %p from queue", event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
/* queue is empty now that we dequeued the EOS */
GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
break;
case GST_EVENT_NEWSEGMENT:
apply_segment (queue, event, &queue->src_segment);
break;
default:
break;
}
} else {
g_warning
("Unexpected item %p dequeued from queue %s (refcounting problem?)",
item, GST_OBJECT_NAME (queue));
item = NULL;
}
GST_QUEUE_SIGNAL_DEL (queue);
return item;
/* ERRORS */
no_item:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "the queue is empty");
return NULL;
}
}
static gboolean
gst_queue_handle_sink_event (GstPad * pad, GstEvent * event)
{
GstQueue *queue;
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "received flush start event");
/* forward event */
gst_pad_push_event (queue->srcpad, event);
/* now unblock the chain function */
GST_QUEUE_MUTEX_LOCK (queue);
queue->srcresult = GST_FLOW_WRONG_STATE;
/* unblock the loop and chain functions */
g_cond_signal (queue->item_add);
g_cond_signal (queue->item_del);
GST_QUEUE_MUTEX_UNLOCK (queue);
/* make sure it pauses, this should happen since we sent
* flush_start downstream. */
gst_pad_pause_task (queue->srcpad);
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "loop stopped");
goto done;
}
case GST_EVENT_FLUSH_STOP:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "received flush stop event");
/* forward event */
gst_pad_push_event (queue->srcpad, event);
GST_QUEUE_MUTEX_LOCK (queue);
gst_queue_locked_flush (queue);
queue->srcresult = GST_FLOW_OK;
queue->is_eos = FALSE;
queue->unexpected = FALSE;
/* reset rate counters */
reset_rate_timer (queue);
gst_pad_start_task (queue->srcpad, (GstTaskFunction) gst_queue_loop,
queue->srcpad);
GST_QUEUE_MUTEX_UNLOCK (queue);
goto done;
}
default:
if (GST_EVENT_IS_SERIALIZED (event)) {
/* serialized events go in the queue */
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
/* refuse more events on EOS */
if (queue->is_eos)
goto out_eos;
gst_queue_locked_enqueue (queue, event);
GST_QUEUE_MUTEX_UNLOCK (queue);
} else {
/* non-serialized events are passed upstream. */
gst_pad_push_event (queue->srcpad, event);
}
break;
}
done:
return TRUE;
/* ERRORS */
out_flushing:
{
GST_DEBUG_OBJECT (queue, "refusing event, we are flushing");
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_event_unref (event);
return FALSE;
}
out_eos:
{
GST_DEBUG_OBJECT (queue, "refusing event, we are EOS");
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_event_unref (event);
return FALSE;
}
}
static gboolean
gst_queue_is_empty (GstQueue * queue)
{
/* never empty on EOS */
if (queue->is_eos)
return FALSE;
if (QUEUE_IS_USING_TEMP_FILE (queue)) {
return queue->writing_pos == queue->max_reading_pos;
} else {
if (queue->queue->length == 0)
return TRUE;
}
return FALSE;
}
static gboolean
gst_queue_is_filled (GstQueue * queue)
{
gboolean res;
/* always filled on EOS */
if (queue->is_eos)
return TRUE;
/* if using file, we're never filled if we don't have EOS */
if (QUEUE_IS_USING_TEMP_FILE (queue))
return FALSE;
/* we are never filled when we have no buffers at all */
if (queue->cur_level.buffers == 0)
return FALSE;
#define CHECK_FILLED(format) ((queue->max_level.format) > 0 && \
(queue->cur_level.format) >= (queue->max_level.format))
/* we are filled if one of the current levels exceeds the max */
res = CHECK_FILLED (buffers) || CHECK_FILLED (bytes) || CHECK_FILLED (time);
/* if we need to, use the rate estimate to check against the max time we are
* allowed to queue */
if (queue->use_rate_estimate)
res |= CHECK_FILLED (rate_time);
#undef CHECK_FILLED
return res;
}
static GstFlowReturn
gst_queue_chain (GstPad * pad, GstBuffer * buffer)
{
GstQueue *queue;
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"received buffer %p of size %d, time %" GST_TIME_FORMAT ", duration %"
GST_TIME_FORMAT, buffer, GST_BUFFER_SIZE (buffer),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
/* we have to lock the queue since we span threads */
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
/* when we received EOS, we refuse more data */
if (queue->is_eos)
goto out_eos;
/* when we received unexpected from downstream, refuse more buffers */
if (queue->unexpected)
goto out_unexpected;
/* We make space available if we're "full" according to whatever
* the user defined as "full". */
if (gst_queue_is_filled (queue)) {
gboolean started;
/* pause the timer while we wait. The fact that we are waiting does not mean
* the byterate on the input pad is lower */
if ((started = queue->in_timer_started))
g_timer_stop (queue->in_timer);
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
"queue is full, waiting for free space");
do {
/* Wait for space to be available, we could be unlocked because of a flush. */
GST_QUEUE_WAIT_DEL_CHECK (queue, out_flushing);
}
while (gst_queue_is_filled (queue));
/* and continue if we were running before */
if (started)
g_timer_continue (queue->in_timer);
}
/* put buffer in queue now */
gst_queue_locked_enqueue (queue, buffer);
GST_QUEUE_MUTEX_UNLOCK (queue);
return GST_FLOW_OK;
/* special conditions */
out_flushing:
{
GstFlowReturn ret = queue->srcresult;
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"exit because task paused, reason: %s", gst_flow_get_name (ret));
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_buffer_unref (buffer);
return ret;
}
out_eos:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because we received EOS");
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_buffer_unref (buffer);
return GST_FLOW_UNEXPECTED;
}
out_unexpected:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"exit because we received UNEXPECTED");
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_buffer_unref (buffer);
return GST_FLOW_UNEXPECTED;
}
}
/* dequeue an item from the queue an push it downstream. This functions returns
* the result of the push. */
static GstFlowReturn
gst_queue_push_one (GstQueue * queue)
{
GstFlowReturn result = GST_FLOW_OK;
GstMiniObject *data;
data = gst_queue_locked_dequeue (queue);
if (data == NULL)
goto no_item;
next:
if (GST_IS_BUFFER (data)) {
GstBuffer *buffer;
GstCaps *caps;
buffer = GST_BUFFER_CAST (data);
caps = GST_BUFFER_CAPS (buffer);
GST_QUEUE_MUTEX_UNLOCK (queue);
/* set caps before pushing the buffer so that core does not try to do
* something fancy to check if this is possible. */
if (caps && caps != GST_PAD_CAPS (queue->srcpad))
gst_pad_set_caps (queue->srcpad, caps);
result = gst_pad_push (queue->srcpad, buffer);
/* need to check for srcresult here as well */
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
if (result == GST_FLOW_UNEXPECTED) {
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"got UNEXPECTED from downstream");
/* stop pushing buffers, we dequeue all items until we see an item that we
* can push again, which is EOS or NEWSEGMENT. If there is nothing in the
* queue we can push, we set a flag to make the sinkpad refuse more
* buffers with an UNEXPECTED return value until we receive something
* pushable again or we get flushed. */
while ((data = gst_queue_locked_dequeue (queue))) {
if (GST_IS_BUFFER (data)) {
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"dropping UNEXPECTED buffer %p", data);
gst_buffer_unref (GST_BUFFER_CAST (data));
} else if (GST_IS_EVENT (data)) {
GstEvent *event = GST_EVENT_CAST (data);
GstEventType type = GST_EVENT_TYPE (event);
if (type == GST_EVENT_EOS || type == GST_EVENT_NEWSEGMENT) {
/* we found a pushable item in the queue, push it out */
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"pushing pushable event %s after UNEXPECTED",
GST_EVENT_TYPE_NAME (event));
goto next;
}
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"dropping UNEXPECTED event %p", event);
gst_event_unref (event);
}
}
/* no more items in the queue. Set the unexpected flag so that upstream
* make us refuse any more buffers on the sinkpad. Since we will still
* accept EOS and NEWSEGMENT we return _FLOW_OK to the caller so that the
* task function does not shut down. */
queue->unexpected = TRUE;
result = GST_FLOW_OK;
}
} else if (GST_IS_EVENT (data)) {
GstEvent *event = GST_EVENT_CAST (data);
GstEventType type = GST_EVENT_TYPE (event);
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_pad_push_event (queue->srcpad, event);
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
/* if we're EOS, return UNEXPECTED so that the task pauses. */
if (type == GST_EVENT_EOS) {
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"pushed EOS event %p, return UNEXPECTED", event);
result = GST_FLOW_UNEXPECTED;
}
}
return result;
/* ERRORS */
no_item:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"exit because we have no item in the queue");
return GST_FLOW_ERROR;
}
out_flushing:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because we are flushing");
return GST_FLOW_WRONG_STATE;
}
}
/* called repeadedly with @pad as the source pad. This function should push out
* data to the peer element. */
static void
gst_queue_loop (GstPad * pad)
{
GstQueue *queue;
GstFlowReturn ret;
queue = GST_QUEUE (GST_PAD_PARENT (pad));
/* have to lock for thread-safety */
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
if (gst_queue_is_empty (queue)) {
gboolean started;
/* pause the timer while we wait. The fact that we are waiting does not mean
* the byterate on the output pad is lower */
if ((started = queue->out_timer_started))
g_timer_stop (queue->out_timer);
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
"queue is empty, waiting for new data");
do {
/* Wait for data to be available, we could be unlocked because of a flush. */
GST_QUEUE_WAIT_ADD_CHECK (queue, out_flushing);
}
while (gst_queue_is_empty (queue));
/* and continue if we were running before */
if (started)
g_timer_continue (queue->out_timer);
}
ret = gst_queue_push_one (queue);
queue->srcresult = ret;
if (ret != GST_FLOW_OK)
goto out_flushing;
GST_QUEUE_MUTEX_UNLOCK (queue);
return;
/* ERRORS */
out_flushing:
{
gboolean eos = queue->is_eos;
GstFlowReturn ret = queue->srcresult;
gst_pad_pause_task (queue->srcpad);
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"pause task, reason: %s", gst_flow_get_name (queue->srcresult));
GST_QUEUE_MUTEX_UNLOCK (queue);
/* let app know about us giving up if upstream is not expected to do so */
/* UNEXPECTED is already taken care of elsewhere */
if (eos && (GST_FLOW_IS_FATAL (ret) || ret == GST_FLOW_NOT_LINKED) &&
(ret != GST_FLOW_UNEXPECTED)) {
GST_ELEMENT_ERROR (queue, STREAM, FAILED,
(_("Internal data flow error.")),
("streaming task paused, reason %s (%d)",
gst_flow_get_name (ret), ret));
gst_pad_push_event (queue->srcpad, gst_event_new_eos ());
}
return;
}
}
static gboolean
gst_queue_handle_src_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
GstQueue *queue = GST_QUEUE (GST_PAD_PARENT (pad));
#ifndef GST_DISABLE_GST_DEBUG
GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "got event %p (%s)",
event, GST_EVENT_TYPE_NAME (event));
#endif
if (!QUEUE_IS_USING_TEMP_FILE (queue)) {
/* just forward upstream */
res = gst_pad_push_event (queue->sinkpad, event);
} else {
/* when using a temp file, we unblock the pending read */
res = TRUE;
gst_event_unref (event);
}
return res;
}
static gboolean
gst_queue_peer_query (GstQueue * queue, GstPad * pad, GstQuery * query)
{
gboolean ret = FALSE;
GstPad *peer;
if ((peer = gst_pad_get_peer (pad))) {
ret = gst_pad_query (peer, query);
gst_object_unref (peer);
}
return ret;
}
static gboolean
gst_queue_handle_src_query (GstPad * pad, GstQuery * query)
{
GstQueue *queue;
queue = GST_QUEUE (GST_PAD_PARENT (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
gint64 peer_pos;
GstFormat format;
if (!gst_queue_peer_query (queue, queue->sinkpad, query))
goto peer_failed;
/* get peer position */
gst_query_parse_position (query, &format, &peer_pos);
/* FIXME: this code assumes that there's no discont in the queue */
switch (format) {
case GST_FORMAT_BYTES:
peer_pos -= queue->cur_level.bytes;
break;
case GST_FORMAT_TIME:
peer_pos -= queue->cur_level.time;
break;
default:
GST_WARNING_OBJECT (queue, "dropping query in %s format, don't "
"know how to adjust value", gst_format_get_name (format));
return FALSE;
}
/* set updated position */
gst_query_set_position (query, format, peer_pos);
break;
}
case GST_QUERY_DURATION:
{
GST_DEBUG_OBJECT (queue, "doing peer query");
if (!gst_queue_peer_query (queue, queue->sinkpad, query))
goto peer_failed;
GST_DEBUG_OBJECT (queue, "peer query success");
break;
}
case GST_QUERY_BUFFERING:
{
GstFormat format;
GST_DEBUG_OBJECT (queue, "query buffering");
if (!QUEUE_IS_USING_TEMP_FILE (queue)) {
/* no temp file, just forward to the peer */
if (!gst_queue_peer_query (queue, queue->sinkpad, query))
goto peer_failed;
GST_DEBUG_OBJECT (queue, "buffering forwarded to peer");
} else {
gint64 start, stop;
gst_query_parse_buffering_range (query, &format, NULL, NULL, NULL);
switch (format) {
case GST_FORMAT_PERCENT:
{
gint64 duration;
GstFormat peer_fmt;
peer_fmt = GST_FORMAT_BYTES;
if (!gst_pad_query_peer_duration (queue->sinkpad, &peer_fmt,
&duration))
goto peer_failed;
GST_DEBUG_OBJECT (queue, "duration %" G_GINT64_FORMAT ", writing %"
G_GINT64_FORMAT, duration, queue->writing_pos);
start = 0;
/* get our available data relative to the duration */
if (duration != -1)
stop = GST_FORMAT_PERCENT_MAX * queue->writing_pos / duration;
else
stop = -1;
break;
}
case GST_FORMAT_BYTES:
start = 0;
stop = queue->writing_pos;
break;
default:
start = -1;
stop = -1;
break;
}
gst_query_set_buffering_percent (query, queue->is_buffering, 100);
gst_query_set_buffering_range (query, format, start, stop, -1);
}
break;
}
default:
/* peer handled other queries */
if (!gst_queue_peer_query (queue, queue->sinkpad, query))
goto peer_failed;
break;
}
return TRUE;
/* ERRORS */
peer_failed:
{
GST_DEBUG_OBJECT (queue, "failed peer query");
return FALSE;
}
}
static GstFlowReturn
gst_queue_get_range (GstPad * pad, guint64 offset, guint length,
GstBuffer ** buffer)
{
GstQueue *queue;
GstFlowReturn ret;
queue = GST_QUEUE_CAST (gst_pad_get_parent (pad));
GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
length = (length == -1) ? DEFAULT_BUFFER_SIZE : length;
offset = (offset == -1) ? queue->reading_pos : offset;
/* function will block when the range is not yet available */
ret = gst_queue_create_read (queue, offset, length, buffer);
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_object_unref (queue);
return ret;
/* ERRORS */
out_flushing:
{
GST_DEBUG_OBJECT (queue, "we are flushing");
GST_QUEUE_MUTEX_UNLOCK (queue);
return GST_FLOW_WRONG_STATE;
}
}
static gboolean
gst_queue_src_checkgetrange_function (GstPad * pad)
{
GstQueue *queue;
gboolean ret;
queue = GST_QUEUE (gst_pad_get_parent (pad));
/* we can operate in pull mode when we are using a tempfile */
ret = QUEUE_IS_USING_TEMP_FILE (queue);
gst_object_unref (GST_OBJECT (queue));
return ret;
}
/* sink currently only operates in push mode */
static gboolean
gst_queue_sink_activate_push (GstPad * pad, gboolean active)
{
gboolean result = TRUE;
GstQueue *queue;
queue = GST_QUEUE (gst_pad_get_parent (pad));
if (active) {
GST_QUEUE_MUTEX_LOCK (queue);
GST_DEBUG_OBJECT (queue, "activating push mode");
queue->srcresult = GST_FLOW_OK;
queue->is_eos = FALSE;
queue->unexpected = FALSE;
reset_rate_timer (queue);
GST_QUEUE_MUTEX_UNLOCK (queue);
} else {
/* unblock chain function */
GST_QUEUE_MUTEX_LOCK (queue);
GST_DEBUG_OBJECT (queue, "deactivating push mode");
queue->srcresult = GST_FLOW_WRONG_STATE;
gst_queue_locked_flush (queue);
GST_QUEUE_MUTEX_UNLOCK (queue);
}
gst_object_unref (queue);
return result;
}
/* src operating in push mode, we start a task on the source pad that pushes out
* buffers from the queue */
static gboolean
gst_queue_src_activate_push (GstPad * pad, gboolean active)
{
gboolean result = FALSE;
GstQueue *queue;
queue = GST_QUEUE (gst_pad_get_parent (pad));
if (active) {
GST_QUEUE_MUTEX_LOCK (queue);
GST_DEBUG_OBJECT (queue, "activating push mode");
queue->srcresult = GST_FLOW_OK;
queue->is_eos = FALSE;
queue->unexpected = FALSE;
result = gst_pad_start_task (pad, (GstTaskFunction) gst_queue_loop, pad);
GST_QUEUE_MUTEX_UNLOCK (queue);
} else {
/* unblock loop function */
GST_QUEUE_MUTEX_LOCK (queue);
GST_DEBUG_OBJECT (queue, "deactivating push mode");
queue->srcresult = GST_FLOW_WRONG_STATE;
/* the item add signal will unblock */
g_cond_signal (queue->item_add);
GST_QUEUE_MUTEX_UNLOCK (queue);
/* step 2, make sure streaming finishes */
result = gst_pad_stop_task (pad);
}
gst_object_unref (queue);
return result;
}
/* pull mode, downstream will call our getrange function */
static gboolean
gst_queue_src_activate_pull (GstPad * pad, gboolean active)
{
gboolean result;
GstQueue *queue;
queue = GST_QUEUE (gst_pad_get_parent (pad));
if (active) {
if (QUEUE_IS_USING_TEMP_FILE (queue)) {
GST_QUEUE_MUTEX_LOCK (queue);
GST_DEBUG_OBJECT (queue, "activating pull mode");
queue->srcresult = GST_FLOW_OK;
queue->is_eos = FALSE;
queue->unexpected = FALSE;
result = TRUE;
GST_QUEUE_MUTEX_UNLOCK (queue);
} else {
GST_QUEUE_MUTEX_LOCK (queue);
GST_DEBUG_OBJECT (queue, "no temp file, cannot activate pull mode");
/* this is not allowed, we cannot operate in pull mode without a temp
* file. */
queue->srcresult = GST_FLOW_WRONG_STATE;
result = FALSE;
GST_QUEUE_MUTEX_UNLOCK (queue);
}
} else {
GST_QUEUE_MUTEX_LOCK (queue);
GST_DEBUG_OBJECT (queue, "deactivating pull mode");
queue->srcresult = GST_FLOW_WRONG_STATE;
/* this will unlock getrange */
g_cond_signal (queue->item_add);
result = TRUE;
GST_QUEUE_MUTEX_UNLOCK (queue);
}
gst_object_unref (queue);
return result;
}
static GstStateChangeReturn
gst_queue_change_state (GstElement * element, GstStateChange transition)
{
GstQueue *queue;
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
queue = GST_QUEUE (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
if (QUEUE_IS_USING_TEMP_FILE (queue)) {
if (!gst_queue_open_temp_location_file (queue))
ret = GST_STATE_CHANGE_FAILURE;
}
queue->segment_event_received = FALSE;
queue->starting_segment = NULL;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (QUEUE_IS_USING_TEMP_FILE (queue))
gst_queue_close_temp_location_file (queue);
if (queue->starting_segment != NULL) {
gst_event_unref (queue->starting_segment);
queue->starting_segment = NULL;
}
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
/* changing the capacity of the queue must wake up
* the _chain function, it might have more room now
* to store the buffer/event in the queue */
#define QUEUE_CAPACITY_CHANGE(q)\
g_cond_signal (queue->item_del);
/* Changing the minimum required fill level must
* wake up the _loop function as it might now
* be able to preceed.
*/
#define QUEUE_THRESHOLD_CHANGE(q)\
g_cond_signal (queue->item_add);
static void
gst_queue_set_temp_template (GstQueue * queue, const gchar * template)
{
GstState state;
/* the element must be stopped in order to do this */
GST_OBJECT_LOCK (queue);
state = GST_STATE (queue);
if (state != GST_STATE_READY && state != GST_STATE_NULL)
goto wrong_state;
GST_OBJECT_UNLOCK (queue);
/* set new location */
g_free (queue->temp_template);
queue->temp_template = g_strdup (template);
return;
/* ERROR */
wrong_state:
{
GST_WARNING_OBJECT (queue, "setting temp-template property in wrong state");
GST_OBJECT_UNLOCK (queue);
}
}
static void
gst_queue_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstQueue *queue = GST_QUEUE (object);
/* someone could change levels here, and since this
* affects the get/put funcs, we need to lock for safety. */
GST_QUEUE_MUTEX_LOCK (queue);
switch (prop_id) {
case PROP_MAX_SIZE_BYTES:
queue->max_level.bytes = g_value_get_uint (value);
QUEUE_CAPACITY_CHANGE (queue);
break;
case PROP_MAX_SIZE_BUFFERS:
queue->max_level.buffers = g_value_get_uint (value);
QUEUE_CAPACITY_CHANGE (queue);
break;
case PROP_MAX_SIZE_TIME:
queue->max_level.time = g_value_get_uint64 (value);
/* set rate_time to the same value. We use an extra field in the level
* structure so that we can easily access and compare it */
queue->max_level.rate_time = queue->max_level.time;
QUEUE_CAPACITY_CHANGE (queue);
break;
case PROP_USE_BUFFERING:
queue->use_buffering = g_value_get_boolean (value);
break;
case PROP_USE_RATE_ESTIMATE:
queue->use_rate_estimate = g_value_get_boolean (value);
break;
case PROP_LOW_PERCENT:
queue->low_percent = g_value_get_int (value);
break;
case PROP_HIGH_PERCENT:
queue->high_percent = g_value_get_int (value);
break;
case PROP_TEMP_TEMPLATE:
gst_queue_set_temp_template (queue, g_value_get_string (value));
break;
case PROP_TEMP_LOCATION:
g_free (queue->temp_location);
queue->temp_location = g_value_dup_string (value);
/* you can set the property back to NULL to make it use the temp-tmpl
* property. */
queue->temp_location_set = queue->temp_location != NULL;
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_QUEUE_MUTEX_UNLOCK (queue);
}
static void
gst_queue_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstQueue *queue = GST_QUEUE (object);
GST_QUEUE_MUTEX_LOCK (queue);
switch (prop_id) {
case PROP_CUR_LEVEL_BYTES:
g_value_set_uint (value, queue->cur_level.bytes);
break;
case PROP_CUR_LEVEL_BUFFERS:
g_value_set_uint (value, queue->cur_level.buffers);
break;
case PROP_CUR_LEVEL_TIME:
g_value_set_uint64 (value, queue->cur_level.time);
break;
case PROP_MAX_SIZE_BYTES:
g_value_set_uint (value, queue->max_level.bytes);
break;
case PROP_MAX_SIZE_BUFFERS:
g_value_set_uint (value, queue->max_level.buffers);
break;
case PROP_MAX_SIZE_TIME:
g_value_set_uint64 (value, queue->max_level.time);
break;
case PROP_USE_BUFFERING:
g_value_set_boolean (value, queue->use_buffering);
break;
case PROP_USE_RATE_ESTIMATE:
g_value_set_boolean (value, queue->use_rate_estimate);
break;
case PROP_LOW_PERCENT:
g_value_set_int (value, queue->low_percent);
break;
case PROP_HIGH_PERCENT:
g_value_set_int (value, queue->high_percent);
break;
case PROP_TEMP_TEMPLATE:
g_value_set_string (value, queue->temp_template);
break;
case PROP_TEMP_LOCATION:
g_value_set_string (value, queue->temp_location);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_QUEUE_MUTEX_UNLOCK (queue);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (queue_debug, "queue2", 0, "queue element");
GST_DEBUG_CATEGORY_INIT (queue_dataflow, "queue2_dataflow", 0,
"dataflow inside the queue element");
#ifdef ENABLE_NLS
GST_DEBUG ("binding text domain %s to locale dir %s", GETTEXT_PACKAGE,
LOCALEDIR);
bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
#endif /* ENABLE_NLS */
return gst_element_register (plugin, "queue2", GST_RANK_NONE, GST_TYPE_QUEUE);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"queue2",
"Queue newer version", plugin_init, VERSION, GST_LICENSE,
GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
Reference in a new issue View git blame Copy permalink