gstreamer/gst/imagefreeze/gstimagefreeze.c
2017-02-09 14:18:30 +02:00

908 lines
25 KiB
C

/* GStreamer
* Copyright (c) 2005 Edward Hervey <bilboed@bilboed.com>
* Copyright (C) 2010 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-imagefreeze
*
* The imagefreeze element generates a still frame video stream from
* the input. It duplicates the first frame with the framerate requested
* by downstream, allows seeking and answers queries.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 -v filesrc location=some.png ! decodebin ! imagefreeze ! autovideosink
* ]| This pipeline shows a still frame stream of a PNG file.
* </refsect2>
*/
/* This is based on the imagefreeze element from PiTiVi:
* http://git.gnome.org/browse/pitivi/tree/pitivi/elements/imagefreeze.py
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/glib-compat-private.h>
#include "gstimagefreeze.h"
static void gst_image_freeze_finalize (GObject * object);
static void gst_image_freeze_reset (GstImageFreeze * self);
static GstStateChangeReturn gst_image_freeze_change_state (GstElement * element,
GstStateChange transition);
static GstFlowReturn gst_image_freeze_sink_chain (GstPad * pad,
GstObject * parent, GstBuffer * buffer);
static gboolean gst_image_freeze_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_image_freeze_sink_setcaps (GstImageFreeze * self,
GstCaps * caps);
static GstCaps *gst_image_freeze_sink_getcaps (GstImageFreeze * self,
GstCaps * filter);
static gboolean gst_image_freeze_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static void gst_image_freeze_src_loop (GstPad * pad);
static gboolean gst_image_freeze_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_image_freeze_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static GstStaticPadTemplate sink_pad_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw"));
static GstStaticPadTemplate src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw"));
GST_DEBUG_CATEGORY_STATIC (gst_image_freeze_debug);
#define GST_CAT_DEFAULT gst_image_freeze_debug
#define gst_image_freeze_parent_class parent_class
G_DEFINE_TYPE (GstImageFreeze, gst_image_freeze, GST_TYPE_ELEMENT);
static void
gst_image_freeze_class_init (GstImageFreezeClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class->finalize = gst_image_freeze_finalize;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_image_freeze_change_state);
gst_element_class_set_static_metadata (gstelement_class,
"Still frame stream generator",
"Filter/Video",
"Generates a still frame stream from an image",
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
gst_element_class_add_static_pad_template (gstelement_class,
&sink_pad_template);
gst_element_class_add_static_pad_template (gstelement_class,
&src_pad_template);
}
static void
gst_image_freeze_init (GstImageFreeze * self)
{
self->sinkpad = gst_pad_new_from_static_template (&sink_pad_template, "sink");
gst_pad_set_chain_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_image_freeze_sink_chain));
gst_pad_set_event_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_image_freeze_sink_event));
gst_pad_set_query_function (self->sinkpad,
GST_DEBUG_FUNCPTR (gst_image_freeze_sink_query));
GST_PAD_SET_PROXY_ALLOCATION (self->sinkpad);
gst_element_add_pad (GST_ELEMENT (self), self->sinkpad);
self->srcpad = gst_pad_new_from_static_template (&src_pad_template, "src");
gst_pad_set_event_function (self->srcpad,
GST_DEBUG_FUNCPTR (gst_image_freeze_src_event));
gst_pad_set_query_function (self->srcpad,
GST_DEBUG_FUNCPTR (gst_image_freeze_src_query));
gst_pad_use_fixed_caps (self->srcpad);
gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
g_mutex_init (&self->lock);
gst_image_freeze_reset (self);
}
static void
gst_image_freeze_finalize (GObject * object)
{
GstImageFreeze *self = GST_IMAGE_FREEZE (object);
gst_image_freeze_reset (self);
g_mutex_clear (&self->lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_image_freeze_reset (GstImageFreeze * self)
{
GST_DEBUG_OBJECT (self, "Resetting internal state");
g_mutex_lock (&self->lock);
gst_buffer_replace (&self->buffer, NULL);
gst_segment_init (&self->segment, GST_FORMAT_TIME);
self->need_segment = TRUE;
self->fps_n = self->fps_d = 0;
self->offset = 0;
self->seqnum = 0;
g_mutex_unlock (&self->lock);
g_atomic_int_set (&self->seeking, 0);
}
static gboolean
gst_image_freeze_sink_setcaps (GstImageFreeze * self, GstCaps * caps)
{
gboolean ret = FALSE;
GstStructure *s;
gint fps_n, fps_d;
GstCaps *othercaps, *intersection;
guint i, n;
GstPad *pad;
pad = self->sinkpad;
caps = gst_caps_copy (caps);
GST_DEBUG_OBJECT (pad, "Setting caps: %" GST_PTR_FORMAT, caps);
s = gst_caps_get_structure (caps, 0);
/* 1. Remove framerate */
gst_structure_remove_field (s, "framerate");
gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1,
NULL);
/* 2. Intersect with template caps */
othercaps = (GstCaps *) gst_pad_get_pad_template_caps (pad);
intersection = gst_caps_intersect (caps, othercaps);
GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps);
GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps);
GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection);
gst_caps_unref (caps);
gst_caps_unref (othercaps);
caps = intersection;
intersection = othercaps = NULL;
/* 3. Intersect with downstream peer caps */
othercaps = gst_pad_peer_query_caps (self->srcpad, caps);
GST_DEBUG_OBJECT (pad, "Peer query resulted: %" GST_PTR_FORMAT, othercaps);
gst_caps_unref (caps);
caps = othercaps;
othercaps = NULL;
/* 4. For every candidate try to use it downstream with framerate as
* near as possible to 25/1 */
n = gst_caps_get_size (caps);
for (i = 0; i < n; i++) {
GstCaps *candidate = gst_caps_new_empty ();
GstStructure *s = gst_structure_copy (gst_caps_get_structure (caps, i));
gst_caps_append_structure (candidate, s);
if (gst_structure_has_field_typed (s, "framerate", GST_TYPE_FRACTION) ||
gst_structure_fixate_field_nearest_fraction (s, "framerate", 25, 1)) {
gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);
if (fps_d != 0) {
if (gst_pad_set_caps (self->srcpad, candidate)) {
g_mutex_lock (&self->lock);
self->fps_n = fps_n;
self->fps_d = fps_d;
g_mutex_unlock (&self->lock);
GST_DEBUG_OBJECT (pad, "Setting caps %" GST_PTR_FORMAT, candidate);
ret = TRUE;
gst_caps_unref (candidate);
break;
}
} else {
GST_WARNING_OBJECT (pad, "Invalid caps with framerate %d/%d", fps_n,
fps_d);
}
}
gst_caps_unref (candidate);
}
if (!ret)
GST_ERROR_OBJECT (pad, "No usable caps found");
gst_caps_unref (caps);
return ret;
}
/* remove framerate in writable @caps */
static void
gst_image_freeze_remove_fps (GstImageFreeze * self, GstCaps * caps)
{
gint i, n;
n = gst_caps_get_size (caps);
for (i = 0; i < n; i++) {
GstStructure *s = gst_caps_get_structure (caps, i);
gst_structure_remove_field (s, "framerate");
gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT,
1, NULL);
}
}
static GstCaps *
gst_image_freeze_sink_getcaps (GstImageFreeze * self, GstCaps * filter)
{
GstCaps *ret, *tmp, *templ;
GstPad *pad;
pad = self->sinkpad;
if (filter) {
filter = gst_caps_copy (filter);
gst_image_freeze_remove_fps (self, filter);
}
templ = gst_pad_get_pad_template_caps (pad);
tmp = gst_pad_peer_query_caps (self->srcpad, filter);
if (tmp) {
GST_LOG_OBJECT (self, "peer caps %" GST_PTR_FORMAT, tmp);
ret = gst_caps_intersect (tmp, templ);
gst_caps_unref (tmp);
} else {
GST_LOG_OBJECT (self, "going to copy");
ret = gst_caps_copy (templ);
}
if (templ)
gst_caps_unref (templ);
if (filter)
gst_caps_unref (filter);
ret = gst_caps_make_writable (ret);
gst_image_freeze_remove_fps (self, ret);
GST_LOG_OBJECT (pad, "Returning caps: %" GST_PTR_FORMAT, ret);
return ret;
}
static gboolean
gst_image_freeze_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
gboolean ret;
GST_LOG_OBJECT (pad, "Handling query of type '%s'",
gst_query_type_get_name (GST_QUERY_TYPE (query)));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *caps;
gst_query_parse_caps (query, &caps);
caps = gst_image_freeze_sink_getcaps (self, caps);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
ret = TRUE;
break;
}
default:
ret = gst_pad_query_default (pad, parent, query);
}
return ret;
}
static gboolean
gst_image_freeze_convert (GstImageFreeze * self,
GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean ret = FALSE;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
if (src_value == -1) {
*dest_value = -1;
return TRUE;
}
switch (src_format) {
case GST_FORMAT_DEFAULT:{
switch (*dest_format) {
case GST_FORMAT_TIME:
g_mutex_lock (&self->lock);
if (self->fps_n == 0)
*dest_value = -1;
else
*dest_value =
gst_util_uint64_scale (src_value, GST_SECOND * self->fps_d,
self->fps_n);
g_mutex_unlock (&self->lock);
ret = TRUE;
break;
default:
break;
}
break;
}
case GST_FORMAT_TIME:{
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
g_mutex_lock (&self->lock);
*dest_value =
gst_util_uint64_scale (src_value, self->fps_n,
self->fps_d * GST_SECOND);
g_mutex_unlock (&self->lock);
ret = TRUE;
break;
default:
break;
}
break;
}
default:
break;
}
return ret;
}
static gboolean
gst_image_freeze_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
gboolean ret = FALSE;
GST_LOG_OBJECT (pad, "Handling query of type '%s'",
gst_query_type_get_name (GST_QUERY_TYPE (query)));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONVERT:{
GstFormat src_format, dest_format;
gint64 src_value, dest_value;
gst_query_parse_convert (query, &src_format, &src_value, &dest_format,
&dest_value);
ret =
gst_image_freeze_convert (self, src_format, src_value, &dest_format,
&dest_value);
if (ret)
gst_query_set_convert (query, src_format, src_value, dest_format,
dest_value);
break;
}
case GST_QUERY_POSITION:{
GstFormat format;
gint64 position;
gst_query_parse_position (query, &format, NULL);
switch (format) {
case GST_FORMAT_DEFAULT:{
g_mutex_lock (&self->lock);
position = self->offset;
g_mutex_unlock (&self->lock);
ret = TRUE;
break;
}
case GST_FORMAT_TIME:{
g_mutex_lock (&self->lock);
position = self->segment.position;
g_mutex_unlock (&self->lock);
ret = TRUE;
break;
}
default:
break;
}
if (ret) {
gst_query_set_position (query, format, position);
GST_DEBUG_OBJECT (pad,
"Returning position %" G_GINT64_FORMAT " in format %s", position,
gst_format_get_name (format));
} else {
GST_DEBUG_OBJECT (pad, "Position query failed");
}
break;
}
case GST_QUERY_DURATION:{
GstFormat format;
gint64 duration;
gst_query_parse_duration (query, &format, NULL);
switch (format) {
case GST_FORMAT_TIME:{
g_mutex_lock (&self->lock);
duration = self->segment.stop;
g_mutex_unlock (&self->lock);
ret = TRUE;
break;
}
case GST_FORMAT_DEFAULT:{
g_mutex_lock (&self->lock);
duration = self->segment.stop;
if (duration != -1)
duration =
gst_util_uint64_scale (duration, self->fps_n,
GST_SECOND * self->fps_d);
g_mutex_unlock (&self->lock);
ret = TRUE;
break;
}
default:
break;
}
if (ret) {
gst_query_set_duration (query, format, duration);
GST_DEBUG_OBJECT (pad,
"Returning duration %" G_GINT64_FORMAT " in format %s", duration,
gst_format_get_name (format));
} else {
GST_DEBUG_OBJECT (pad, "Duration query failed");
}
break;
}
case GST_QUERY_SEEKING:{
GstFormat format;
gboolean seekable;
gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
seekable = (format == GST_FORMAT_TIME || format == GST_FORMAT_DEFAULT);
gst_query_set_seeking (query, format, seekable, (seekable ? 0 : -1), -1);
ret = TRUE;
break;
}
case GST_QUERY_LATENCY:
/* This will only return an accurate latency for the first buffer since
* all further buffers outputted by us are just copies of that one, and
* the latency is 0 in that case. However, latency changes are not
* straightforward, so let's do the conservative fix for now. */
ret = gst_pad_query_default (pad, parent, query);
break;
default:
ret = FALSE;
break;
}
return ret;
}
static gboolean
gst_image_freeze_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
gboolean ret;
GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
gst_image_freeze_sink_setcaps (self, caps);
gst_event_unref (event);
ret = TRUE;
break;
}
case GST_EVENT_EOS:
if (!self->buffer) {
/* if we receive EOS before a buffer arrives, then let it pass */
GST_DEBUG_OBJECT (self, "EOS without input buffer, passing on");
ret = gst_pad_push_event (self->srcpad, event);
break;
}
/* fall-through */
case GST_EVENT_SEGMENT:
GST_DEBUG_OBJECT (pad, "Dropping event");
gst_event_unref (event);
ret = TRUE;
break;
case GST_EVENT_FLUSH_START:
gst_image_freeze_reset (self);
/* fall through */
default:
ret = gst_pad_push_event (self->srcpad, event);
break;
}
return ret;
}
static gboolean
gst_image_freeze_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
gboolean ret;
GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NAVIGATION:
case GST_EVENT_QOS:
case GST_EVENT_LATENCY:
case GST_EVENT_STEP:
GST_DEBUG_OBJECT (pad, "Dropping event");
gst_event_unref (event);
ret = TRUE;
break;
case GST_EVENT_SEEK:{
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType start_type, stop_type;
gint64 start, stop;
gint64 last_stop;
gboolean start_task;
gboolean flush;
guint32 seqnum;
gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
gst_event_unref (event);
flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT) {
GST_ERROR_OBJECT (pad, "Seek in invalid format: %s",
gst_format_get_name (format));
ret = FALSE;
break;
}
if (format == GST_FORMAT_DEFAULT) {
format = GST_FORMAT_TIME;
if (!gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, start, &format,
&start)
|| !gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, stop,
&format, &stop)
|| start == -1 || stop == -1) {
GST_ERROR_OBJECT (pad,
"Failed to convert seek from DEFAULT format into TIME format");
ret = FALSE;
break;
}
}
seqnum = gst_event_get_seqnum (event);
if (flush) {
GstEvent *e;
g_atomic_int_set (&self->seeking, 1);
e = gst_event_new_flush_start ();
gst_event_set_seqnum (e, seqnum);
gst_pad_push_event (self->srcpad, e);
} else {
gst_pad_pause_task (self->srcpad);
}
GST_PAD_STREAM_LOCK (self->srcpad);
g_mutex_lock (&self->lock);
gst_segment_do_seek (&self->segment, rate, format, flags, start_type,
start, stop_type, stop, NULL);
self->need_segment = TRUE;
last_stop = self->segment.position;
start_task = self->buffer != NULL;
g_mutex_unlock (&self->lock);
if (flush) {
GstEvent *e;
e = gst_event_new_flush_stop (TRUE);
gst_event_set_seqnum (e, seqnum);
gst_pad_push_event (self->srcpad, e);
g_atomic_int_set (&self->seeking, 0);
}
if (flags & GST_SEEK_FLAG_SEGMENT) {
GstMessage *m;
m = gst_message_new_segment_start (GST_OBJECT (self),
format, last_stop);
gst_element_post_message (GST_ELEMENT (self), m);
}
self->seqnum = seqnum;
GST_PAD_STREAM_UNLOCK (self->srcpad);
GST_DEBUG_OBJECT (pad, "Seek successful");
if (start_task) {
g_mutex_lock (&self->lock);
if (self->buffer != NULL)
gst_pad_start_task (self->srcpad,
(GstTaskFunction) gst_image_freeze_src_loop, self->srcpad, NULL);
g_mutex_unlock (&self->lock);
}
ret = TRUE;
break;
}
case GST_EVENT_FLUSH_START:
gst_image_freeze_reset (self);
/* fall through */
default:
ret = gst_pad_push_event (self->sinkpad, event);
break;
}
return ret;
}
static GstFlowReturn
gst_image_freeze_sink_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstImageFreeze *self = GST_IMAGE_FREEZE (parent);
g_mutex_lock (&self->lock);
if (self->buffer) {
GST_DEBUG_OBJECT (pad, "Already have a buffer, dropping");
gst_buffer_unref (buffer);
g_mutex_unlock (&self->lock);
return GST_FLOW_EOS;
}
self->buffer = buffer;
gst_pad_start_task (self->srcpad, (GstTaskFunction) gst_image_freeze_src_loop,
self->srcpad, NULL);
g_mutex_unlock (&self->lock);
return GST_FLOW_EOS;
}
static void
gst_image_freeze_src_loop (GstPad * pad)
{
GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad));
GstBuffer *buffer;
guint64 offset;
GstClockTime timestamp, timestamp_end;
guint64 cstart, cstop;
gboolean in_seg, eos;
GstFlowReturn flow_ret = GST_FLOW_OK;
g_mutex_lock (&self->lock);
if (!gst_pad_has_current_caps (self->srcpad)) {
GST_ERROR_OBJECT (pad, "Not negotiated yet");
flow_ret = GST_FLOW_NOT_NEGOTIATED;
g_mutex_unlock (&self->lock);
goto pause_task;
}
if (!self->buffer) {
GST_ERROR_OBJECT (pad, "Have no buffer yet");
flow_ret = GST_FLOW_ERROR;
g_mutex_unlock (&self->lock);
goto pause_task;
}
buffer = gst_buffer_copy (self->buffer);
g_mutex_unlock (&self->lock);
if (self->need_segment) {
GstEvent *e;
GST_DEBUG_OBJECT (pad, "Pushing SEGMENT event: %" GST_SEGMENT_FORMAT,
&self->segment);
e = gst_event_new_segment (&self->segment);
if (self->seqnum)
gst_event_set_seqnum (e, self->seqnum);
g_mutex_lock (&self->lock);
if (self->segment.rate >= 0) {
self->offset =
gst_util_uint64_scale (self->segment.start, self->fps_n,
self->fps_d * GST_SECOND);
} else {
self->offset =
gst_util_uint64_scale (self->segment.stop, self->fps_n,
self->fps_d * GST_SECOND);
}
g_mutex_unlock (&self->lock);
self->need_segment = FALSE;
gst_pad_push_event (self->srcpad, e);
}
g_mutex_lock (&self->lock);
offset = self->offset;
if (self->fps_n != 0) {
timestamp =
gst_util_uint64_scale (offset, self->fps_d * GST_SECOND, self->fps_n);
timestamp_end =
gst_util_uint64_scale (offset + 1, self->fps_d * GST_SECOND,
self->fps_n);
} else {
timestamp = self->segment.start;
timestamp_end = GST_CLOCK_TIME_NONE;
}
eos = (self->fps_n == 0 && offset > 0) ||
(self->segment.rate >= 0 && self->segment.stop != -1
&& timestamp > self->segment.stop) || (self->segment.rate < 0
&& offset == 0) || (self->segment.rate < 0
&& self->segment.start != -1 && timestamp_end < self->segment.start);
if (self->fps_n == 0 && offset > 0)
in_seg = FALSE;
else
in_seg =
gst_segment_clip (&self->segment, GST_FORMAT_TIME, timestamp,
timestamp_end, &cstart, &cstop);
if (in_seg) {
self->segment.position = cstart;
if (self->segment.rate >= 0)
self->segment.position = cstop;
}
if (self->segment.rate >= 0)
self->offset++;
else
self->offset--;
g_mutex_unlock (&self->lock);
GST_DEBUG_OBJECT (pad, "Handling buffer with timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
if (in_seg) {
GST_BUFFER_DTS (buffer) = GST_CLOCK_TIME_NONE;
GST_BUFFER_PTS (buffer) = cstart;
GST_BUFFER_DURATION (buffer) = cstop - cstart;
GST_BUFFER_OFFSET (buffer) = offset;
GST_BUFFER_OFFSET_END (buffer) = offset + 1;
flow_ret = gst_pad_push (self->srcpad, buffer);
GST_DEBUG_OBJECT (pad, "Pushing buffer resulted in %s",
gst_flow_get_name (flow_ret));
if (flow_ret != GST_FLOW_OK)
goto pause_task;
} else {
gst_buffer_unref (buffer);
}
if (eos) {
flow_ret = GST_FLOW_EOS;
goto pause_task;
}
return;
pause_task:
{
const gchar *reason = gst_flow_get_name (flow_ret);
GST_LOG_OBJECT (self, "pausing task, reason %s", reason);
gst_pad_pause_task (pad);
if (flow_ret == GST_FLOW_EOS) {
if ((self->segment.flags & GST_SEEK_FLAG_SEGMENT)) {
GstMessage *m;
GstEvent *e;
GST_DEBUG_OBJECT (pad, "Sending segment done at end of segment");
if (self->segment.rate >= 0) {
m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
GST_FORMAT_TIME, self->segment.stop);
e = gst_event_new_segment_done (GST_FORMAT_TIME, self->segment.stop);
} else {
m = gst_message_new_segment_done (GST_OBJECT_CAST (self),
GST_FORMAT_TIME, self->segment.start);
e = gst_event_new_segment_done (GST_FORMAT_TIME, self->segment.start);
}
gst_element_post_message (GST_ELEMENT_CAST (self), m);
gst_pad_push_event (self->srcpad, e);
} else {
GstEvent *e = gst_event_new_eos ();
GST_DEBUG_OBJECT (pad, "Sending EOS at end of segment");
if (self->seqnum)
gst_event_set_seqnum (e, self->seqnum);
gst_pad_push_event (self->srcpad, e);
}
} else if (flow_ret == GST_FLOW_NOT_LINKED || flow_ret < GST_FLOW_EOS) {
GstEvent *e = gst_event_new_eos ();
GST_ELEMENT_FLOW_ERROR (self, flow_ret);
if (self->seqnum)
gst_event_set_seqnum (e, self->seqnum);
gst_pad_push_event (self->srcpad, e);
}
return;
}
}
static GstStateChangeReturn
gst_image_freeze_change_state (GstElement * element, GstStateChange transition)
{
GstImageFreeze *self = GST_IMAGE_FREEZE (element);
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_image_freeze_reset (self);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_pad_stop_task (self->srcpad);
gst_image_freeze_reset (self);
break;
default:
break;
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
default:
break;
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_image_freeze_debug, "imagefreeze", 0,
"imagefreeze element");
if (!gst_element_register (plugin, "imagefreeze", GST_RANK_NONE,
GST_TYPE_IMAGE_FREEZE))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
imagefreeze,
"Still frame stream generator",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)