gstreamer/gst/base/gstbasetransform.c
Andy Wingo fd980b9f72 gst/base/gstbasetransform.c (gst_base_transform_setcaps): Default to returning TRUE for the case when tranform_caps r...
Original commit message from CVS:
2005-07-05  Andy Wingo  <wingo@pobox.com>

* gst/base/gstbasetransform.c (gst_base_transform_setcaps):
Default to returning TRUE for the case when tranform_caps returns
a fixed caps, like for identity or volume.
2005-07-05 09:35:22 +00:00

534 lines
14 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* 2005 Wim Taymans <wim@fluendo.com>
*
* gstbasetransform.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.
*/
#include <stdlib.h>
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "../gst-i18n-lib.h"
#include "gstbasetransform.h"
#include <gst/gstmarshal.h>
GST_DEBUG_CATEGORY_STATIC (gst_base_transform_debug);
#define GST_CAT_DEFAULT gst_base_transform_debug
/* BaseTransform signals and args */
enum
{
SIGNAL_HANDOFF,
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
};
static GstElementClass *parent_class = NULL;
static void gst_base_transform_base_init (gpointer g_class);
static void gst_base_transform_class_init (GstBaseTransformClass * klass);
static void gst_base_transform_init (GstBaseTransform * trans,
gpointer g_class);
GType
gst_base_transform_get_type (void)
{
static GType base_transform_type = 0;
if (!base_transform_type) {
static const GTypeInfo base_transform_info = {
sizeof (GstBaseTransformClass),
(GBaseInitFunc) gst_base_transform_base_init,
NULL,
(GClassInitFunc) gst_base_transform_class_init,
NULL,
NULL,
sizeof (GstBaseTransform),
0,
(GInstanceInitFunc) gst_base_transform_init,
};
base_transform_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstBaseTransform", &base_transform_info, G_TYPE_FLAG_ABSTRACT);
}
return base_transform_type;
}
static void gst_base_transform_finalize (GObject * object);
static void gst_base_transform_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_base_transform_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_base_transform_src_activate_pull (GstPad * pad,
gboolean active);
static gboolean gst_base_transform_sink_activate_push (GstPad * pad,
gboolean active);
static GstElementStateReturn gst_base_transform_change_state (GstElement *
element);
static gboolean gst_base_transform_event (GstPad * pad, GstEvent * event);
static GstFlowReturn gst_base_transform_getrange (GstPad * pad, guint64 offset,
guint length, GstBuffer ** buffer);
static GstFlowReturn gst_base_transform_chain (GstPad * pad,
GstBuffer * buffer);
static GstFlowReturn gst_base_transform_handle_buffer (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer ** outbuf);
static GstCaps *gst_base_transform_getcaps (GstPad * pad);
static gboolean gst_base_transform_setcaps (GstPad * pad, GstCaps * caps);
/* static guint gst_base_transform_signals[LAST_SIGNAL] = { 0 }; */
static void
gst_base_transform_base_init (gpointer g_class)
{
GST_DEBUG_CATEGORY_INIT (gst_base_transform_debug, "basetransform", 0,
"basetransform element");
}
static void
gst_base_transform_finalize (GObject * object)
{
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_base_transform_class_init (GstBaseTransformClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = G_OBJECT_CLASS (klass);
gstelement_class = GST_ELEMENT_CLASS (klass);
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gobject_class->set_property =
GST_DEBUG_FUNCPTR (gst_base_transform_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_base_transform_get_property);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_transform_finalize);
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_base_transform_change_state);
}
static void
gst_base_transform_init (GstBaseTransform * trans, gpointer g_class)
{
GstPadTemplate *pad_template;
GST_DEBUG ("gst_base_transform_init");
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "sink");
g_return_if_fail (pad_template != NULL);
trans->sinkpad = gst_pad_new_from_template (pad_template, "sink");
gst_pad_set_getcaps_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_getcaps));
gst_pad_set_setcaps_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_setcaps));
gst_pad_set_event_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_event));
gst_pad_set_chain_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_chain));
gst_pad_set_activatepush_function (trans->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_transform_sink_activate_push));
gst_element_add_pad (GST_ELEMENT (trans), trans->sinkpad);
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "src");
g_return_if_fail (pad_template != NULL);
trans->srcpad = gst_pad_new_from_template (pad_template, "src");
gst_pad_set_getcaps_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_getcaps));
gst_pad_set_setcaps_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_setcaps));
gst_pad_set_getrange_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_getrange));
gst_pad_set_activatepull_function (trans->srcpad,
GST_DEBUG_FUNCPTR (gst_base_transform_src_activate_pull));
gst_element_add_pad (GST_ELEMENT (trans), trans->srcpad);
}
static GstCaps *
gst_base_transform_transform_caps (GstBaseTransform * trans, GstPad * pad,
GstCaps * caps)
{
GstCaps *ret;
GstBaseTransformClass *klass;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GST_DEBUG_OBJECT (trans, "from: %" GST_PTR_FORMAT, caps);
if (klass->transform_caps)
ret = klass->transform_caps (trans, pad, caps);
else
ret = gst_caps_ref (caps);
GST_DEBUG_OBJECT (trans, "to: %" GST_PTR_FORMAT, ret);
return ret;
}
static GstCaps *
gst_base_transform_getcaps (GstPad * pad)
{
GstBaseTransform *trans;
GstPad *otherpad;
GstCaps *caps;
trans = GST_BASE_TRANSFORM (GST_PAD_PARENT (pad));
otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
/* we can do what the peer can */
caps = gst_pad_peer_get_caps (otherpad);
if (caps) {
GstCaps *temp;
temp = gst_caps_intersect (caps, gst_pad_get_pad_template_caps (otherpad));
gst_caps_unref (caps);
caps = gst_base_transform_transform_caps (trans, otherpad, temp);
gst_caps_unref (temp);
temp = gst_caps_intersect (caps, gst_pad_get_pad_template_caps (pad));
gst_caps_unref (caps);
caps = temp;
} else {
/* no peer, our padtemplate is enough then */
caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
}
return caps;
}
static gboolean
gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
{
GstBaseTransform *trans;
GstBaseTransformClass *klass;
GstPad *otherpad, *otherpeer;
GstCaps *othercaps = NULL;
gboolean ret = TRUE;
trans = GST_BASE_TRANSFORM (GST_PAD_PARENT (pad));
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
otherpeer = gst_pad_get_peer (otherpad);
if (GST_PAD_IS_IN_SETCAPS (otherpad)) {
ret = TRUE;
goto done;
}
/* see how we can transform the input caps */
othercaps = gst_base_transform_transform_caps (trans, pad, caps);
if (!othercaps) {
ret = FALSE;
goto done;
}
if (!gst_caps_is_fixed (othercaps)) {
GstCaps *temp;
temp = gst_caps_intersect (othercaps, caps);
if (temp) {
/* try passthrough. we know it's fixed, because caps is fixed */
if (gst_pad_accept_caps (otherpeer, caps)) {
gst_caps_unref (othercaps);
othercaps = gst_caps_ref (caps);
/* will fall though. calls accept_caps again, should fix that. */
}
gst_caps_unref (temp);
}
}
if (!gst_caps_is_fixed (othercaps) && otherpeer) {
/* intersect against what the peer can do */
if (otherpeer) {
GstCaps *peercaps;
GstCaps *intersect;
peercaps = gst_pad_get_caps (otherpeer);
intersect = gst_caps_intersect (peercaps, othercaps);
gst_caps_unref (peercaps);
gst_caps_unref (othercaps);
othercaps = intersect;
GST_DEBUG ("filtering against peer yields %" GST_PTR_FORMAT, othercaps);
}
}
if (!gst_caps_is_fixed (othercaps)) {
GstCaps *temp;
/* take first possibility and fixate if necessary */
temp = gst_caps_copy_nth (othercaps, 0);
gst_caps_unref (othercaps);
othercaps = temp;
gst_pad_fixate_caps (otherpad, othercaps);
}
g_return_val_if_fail (gst_caps_is_fixed (othercaps), FALSE);
if (otherpeer && !gst_pad_accept_caps (otherpeer, othercaps)) {
GST_DEBUG ("FAILED to get peer of %" GST_PTR_FORMAT
" to accept %" GST_PTR_FORMAT, otherpad, othercaps);
ret = FALSE;
goto done;
}
/* we know this will work, we implement the setcaps */
gst_pad_set_caps (otherpad, othercaps);
/* success, let the element know */
if (klass->set_caps) {
if (pad == trans->sinkpad)
ret = klass->set_caps (trans, caps, othercaps);
else
ret = klass->set_caps (trans, othercaps, caps);
}
done:
if (otherpeer)
gst_object_unref (otherpeer);
if (othercaps)
gst_caps_unref (othercaps);
return ret;
}
static gboolean
gst_base_transform_event (GstPad * pad, GstEvent * event)
{
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
gboolean ret = FALSE;
gboolean unlock;
trans = GST_BASE_TRANSFORM (GST_PAD_PARENT (pad));
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->event)
bclass->event (trans, event);
unlock = FALSE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH:
if (GST_EVENT_FLUSH_DONE (event)) {
GST_STREAM_LOCK (pad);
unlock = TRUE;
}
break;
case GST_EVENT_EOS:
GST_STREAM_LOCK (pad);
unlock = TRUE;
break;
default:
break;
}
ret = gst_pad_event_default (pad, event);
if (unlock)
GST_STREAM_UNLOCK (pad);
return ret;
}
static GstFlowReturn
gst_base_transform_getrange (GstPad * pad, guint64 offset,
guint length, GstBuffer ** buffer)
{
GstBaseTransform *trans;
GstFlowReturn ret;
GstBuffer *inbuf;
trans = GST_BASE_TRANSFORM (GST_PAD_PARENT (pad));
GST_STREAM_LOCK (pad);
ret = gst_pad_pull_range (trans->sinkpad, offset, length, &inbuf);
if (ret == GST_FLOW_OK) {
ret = gst_base_transform_handle_buffer (trans, inbuf, buffer);
}
GST_STREAM_UNLOCK (pad);
return ret;
}
static GstFlowReturn
gst_base_transform_chain (GstPad * pad, GstBuffer * buffer)
{
GstBaseTransform *trans;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *outbuf;
trans = GST_BASE_TRANSFORM (GST_PAD_PARENT (pad));
GST_STREAM_LOCK (pad);
ret = gst_base_transform_handle_buffer (trans, buffer, &outbuf);
if (ret == GST_FLOW_OK) {
ret = gst_pad_push (trans->srcpad, outbuf);
}
GST_STREAM_UNLOCK (pad);
return ret;
}
static GstFlowReturn
gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
GstBuffer ** outbuf)
{
GstFlowReturn ret = GST_FLOW_OK;
GstBaseTransformClass *bclass;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->transform)
ret = bclass->transform (trans, inbuf, outbuf);
return ret;
}
static void
gst_base_transform_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstBaseTransform *trans;
trans = GST_BASE_TRANSFORM (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_base_transform_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstBaseTransform *trans;
trans = GST_BASE_TRANSFORM (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_base_transform_sink_activate_push (GstPad * pad, gboolean active)
{
gboolean result = TRUE;
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
trans = GST_BASE_TRANSFORM (GST_OBJECT_PARENT (pad));
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (active) {
if (bclass->start)
result = bclass->start (trans);
}
return result;
}
static gboolean
gst_base_transform_src_activate_pull (GstPad * pad, gboolean active)
{
gboolean result = FALSE;
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
trans = GST_BASE_TRANSFORM (GST_OBJECT_PARENT (pad));
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
result = gst_pad_activate_pull (trans->sinkpad, active);
if (active) {
if (result && bclass->start)
result &= bclass->start (trans);
}
return result;
}
static GstElementStateReturn
gst_base_transform_change_state (GstElement * element)
{
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
GstElementState transition;
GstElementStateReturn result;
trans = GST_BASE_TRANSFORM (element);
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
transition = GST_STATE_TRANSITION (element);
switch (transition) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_PLAYING:
break;
default:
break;
}
result = GST_ELEMENT_CLASS (parent_class)->change_state (element);
switch (transition) {
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
if (bclass->stop)
result = bclass->stop (trans);
break;
case GST_STATE_READY_TO_NULL:
break;
default:
break;
}
return result;
}