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gst/videodrop/gstvideodrop.*: Work based on timestamp of input data, not based on the expected framerate from the inp...

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Original commit message from CVS:
* gst/videodrop/gstvideodrop.c: (gst_videodrop_init),
(gst_videodrop_chain), (gst_videodrop_change_state):
* gst/videodrop/gstvideodrop.h:
Work based on timestamp of input data, not based on the expected
framerate from the input. The consequence is that this element now
not only scales framerates, but also functions as a framerate
corrector or framerate stabilizer/constantizer.
This commit is contained in:
Ronald S. Bultje 2004-02-29 05:14:24 +00:00
parent 603eae54ad
commit 1451d85dab
3 changed files with 46 additions and 12 deletions
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10
ChangeLog
View file

@ -1,3 +1,13 @@
2004-02-29 Ronald Bultje <rbultje@ronald.bitfreak.net>
* gst/videodrop/gstvideodrop.c: (gst_videodrop_init),
(gst_videodrop_chain), (gst_videodrop_change_state):
* gst/videodrop/gstvideodrop.h:
Work based on timestamp of input data, not based on the expected
framerate from the input. The consequence is that this element now
not only scales framerates, but also functions as a framerate
corrector or framerate stabilizer/constantizer.
2004-02-27 David Schleef <ds@schleef.org>
patches from jmmv@menta.net (Julio M. Merino Vidal)

46
gst/videodrop/gstvideodrop.c
View file

@ -141,11 +141,6 @@ gst_videodrop_class_init (GstVideodropClass *klass)
element_class->change_state = gst_videodrop_change_state;
}
#define gst_caps_get_float_range(caps, name, min, max) \
gst_props_entry_get_float_range(gst_props_get_entry((caps)->properties, \
name), \
min, max)
static GstCaps *
gst_videodrop_getcaps (GstPad *pad)
{
@ -219,6 +214,8 @@ gst_videodrop_link (GstPad *pad, const GstCaps *caps)
static void
gst_videodrop_init (GstVideodrop *videodrop)
{
GST_FLAG_SET (videodrop, GST_ELEMENT_EVENT_AWARE);
GST_DEBUG ("gst_videodrop_init");
videodrop->sinkpad = gst_pad_new_from_template (
gst_static_pad_template_get (&gst_videodrop_sink_template), "sink");
@ -236,6 +233,7 @@ gst_videodrop_init (GstVideodrop *videodrop)
videodrop->inited = FALSE;
videodrop->total = videodrop->pass = 0;
videodrop->speed = 1.;
videodrop->time_adjust = 0;
}
static void
@ -245,19 +243,44 @@ gst_videodrop_chain (GstPad *pad, GstData *data)
GstBuffer *buf;
if (GST_IS_EVENT (data)) {
gst_pad_event_default (videodrop->srcpad, GST_EVENT (data));
GstEvent *event = GST_EVENT (data);
if (GST_EVENT_TYPE (event) == GST_EVENT_DISCONTINUOUS) {
/* since we rely on timestamps of the source, we need to handle
* changes in time carefully. */
gint64 time;
if (gst_event_discont_get_value (event, GST_FORMAT_TIME, &time)) {
videodrop->time_adjust = time;
videodrop->total = videodrop->pass = 0;
} else {
GST_ELEMENT_ERROR (videodrop, STREAM, TOO_LAZY, (NULL),
("Received discont, but no time information"));
gst_event_unref (event);
return;
}
}
gst_pad_event_default (pad, event);
return;
}
buf = GST_BUFFER (data);
videodrop->total++;
while (videodrop->to_fps / (videodrop->from_fps * videodrop->speed) >
(gfloat) videodrop->pass / videodrop->total) {
while (((GST_BUFFER_TIMESTAMP (buf) - videodrop->time_adjust) *
videodrop->to_fps * videodrop->speed / GST_SECOND) >= videodrop->pass) {
/* since we write to the struct (time/duration), we need a new struct,
* but we don't want to copy around data - a subbuffer is the easiest
* way to accomplish that... */
GstBuffer *copy = gst_buffer_create_sub (buf, 0, GST_BUFFER_SIZE (buf));
/* adjust timestamp/duration and push forward */
GST_BUFFER_TIMESTAMP (copy) = videodrop->time_adjust / videodrop->speed +
GST_SECOND * videodrop->pass / videodrop->to_fps;
GST_BUFFER_DURATION (copy) = GST_SECOND / videodrop->to_fps;
gst_pad_push (videodrop->srcpad, GST_DATA (copy));
videodrop->pass++;
gst_buffer_ref (buf);
GST_BUFFER_TIMESTAMP (buf) /= videodrop->speed;
gst_pad_push (videodrop->srcpad, GST_DATA (buf));
}
gst_buffer_unref (buf);
@ -307,6 +330,7 @@ gst_videodrop_change_state (GstElement *element)
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_PAUSED_TO_READY:
videodrop->inited = FALSE;
videodrop->time_adjust = 0;
videodrop->total = videodrop->pass = 0;
break;
default:

2
gst/videodrop/gstvideodrop.h
View file

@ -48,7 +48,7 @@ struct _GstVideodrop {
gfloat from_fps,
to_fps;
gfloat speed;
guint64 pass, total;
guint64 pass, total, time_adjust;
};
struct _GstVideodropClass {