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Implement something to make video play faster/slower

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Original commit message from CVS:
Implement something to make video play faster/slower
This commit is contained in:
Ronald S. Bultje 2003-12-09 23:08:17 +00:00
parent d04fb4dc6c
commit 1c1767f82e
2 changed files with 95 additions and 16 deletions
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106
gst/videodrop/gstvideodrop.c
View file

@ -39,6 +39,7 @@ enum {
enum { enum {
ARG_0, ARG_0,
ARG_SPEED
/* FILL ME */ /* FILL ME */
}; };
@ -87,6 +88,18 @@ static void gst_videodrop_class_init (GstVideodropClass *klass);
static void gst_videodrop_init (GstVideodrop *videodrop); static void gst_videodrop_init (GstVideodrop *videodrop);
static void gst_videodrop_chain (GstPad *pad, GstData *_data); static void gst_videodrop_chain (GstPad *pad, GstData *_data);
static void gst_videodrop_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gst_videodrop_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static GstElementStateReturn
gst_videodrop_change_state (GstElement *element);
static GstElementClass *parent_class = NULL; static GstElementClass *parent_class = NULL;
/*static guint gst_videodrop_signals[LAST_SIGNAL] = { 0 }; */ /*static guint gst_videodrop_signals[LAST_SIGNAL] = { 0 }; */
@ -131,7 +144,20 @@ gst_videodrop_base_init (gpointer g_class)
static void static void
gst_videodrop_class_init (GstVideodropClass *klass) gst_videodrop_class_init (GstVideodropClass *klass)
{ {
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass); parent_class = g_type_class_peek_parent (klass);
g_object_class_install_property (object_class, ARG_SPEED,
g_param_spec_float ("speed", "Speed",
"Output speed (relative to input)",
0.01, 100, 1, G_PARAM_READWRITE));
object_class->set_property = gst_videodrop_set_property;
object_class->get_property = gst_videodrop_get_property;
element_class->change_state = gst_videodrop_change_state;
} }
#define gst_caps_get_float_range(caps, name, min, max) \ #define gst_caps_get_float_range(caps, name, min, max) \
@ -206,38 +232,90 @@ gst_videodrop_init (GstVideodrop *videodrop)
videodrop->inited = FALSE; videodrop->inited = FALSE;
videodrop->total = videodrop->pass = 0; videodrop->total = videodrop->pass = 0;
videodrop->speed = 1.;
} }
static void static void
gst_videodrop_chain (GstPad *pad, GstData *_data) gst_videodrop_chain (GstPad *pad, GstData *data)
{ {
GstBuffer *buf = GST_BUFFER (_data); GstVideodrop *videodrop = GST_VIDEODROP (gst_pad_get_parent (pad));
GstVideodrop *videodrop; GstBuffer *buf;
GST_DEBUG ("gst_videodrop_chain"); if (GST_IS_EVENT (data)) {
gst_pad_event_default (videodrop->srcpad, GST_EVENT (data));
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
videodrop = GST_VIDEODROP (gst_pad_get_parent (pad));
if (GST_IS_EVENT (buf)) {
gst_pad_push (videodrop->srcpad, GST_DATA (buf));
return; return;
} }
buf = GST_BUFFER (data);
videodrop->total++; videodrop->total++;
while (videodrop->to_fps / videodrop->from_fps > while (videodrop->to_fps / (videodrop->from_fps * videodrop->speed) >
(gfloat) videodrop->pass / videodrop->total) { (gfloat) videodrop->pass / videodrop->total) {
videodrop->pass++; videodrop->pass++;
gst_buffer_ref (buf); gst_buffer_ref (buf);
GST_BUFFER_TIMESTAMP (buf) /= videodrop->speed;
gst_pad_push (videodrop->srcpad, GST_DATA (buf)); gst_pad_push (videodrop->srcpad, GST_DATA (buf));
} }
gst_buffer_unref (buf); gst_buffer_unref (buf);
} }
static void
gst_videodrop_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GstVideodrop *videodrop = GST_VIDEODROP (object);
switch (prop_id) {
case ARG_SPEED:
videodrop->speed = g_value_get_float (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_videodrop_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GstVideodrop *videodrop = GST_VIDEODROP (object);
switch (prop_id) {
case ARG_SPEED:
g_value_set_float (value, videodrop->speed);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstElementStateReturn
gst_videodrop_change_state (GstElement *element)
{
GstVideodrop *videodrop = GST_VIDEODROP (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_PAUSED_TO_READY:
videodrop->inited = FALSE;
videodrop->total = videodrop->pass = 0;
break;
default:
break;
}
if (parent_class->change_state)
return parent_class->change_state (element);
return GST_STATE_SUCCESS;
}
static gboolean static gboolean
plugin_init (GstPlugin *plugin) plugin_init (GstPlugin *plugin)
{ {

5
gst/videodrop/gstvideodrop.h
View file

@ -45,8 +45,9 @@ struct _GstVideodrop {
/* video state */ /* video state */
gboolean inited; gboolean inited;
float from_fps, gfloat from_fps,
to_fps; to_fps;
gfloat speed;
guint64 pass, total; guint64 pass, total;
}; };