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gst/base/gstbasetransform.*: Many fixes and new features added by Thomas. Can now also do transforms with variable si...

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Original commit message from CVS:
* gst/base/gstbasetransform.c: (gst_base_transform_init),
(gst_base_transform_transform_caps),
(gst_base_transform_transform_size),
(gst_base_transform_configure_caps), (gst_base_transform_setcaps),
(gst_base_transform_get_size), (gst_base_transform_buffer_alloc),
(gst_base_transform_handle_buffer):
* gst/base/gstbasetransform.h:
Many fixes and new features added by Thomas. Can now also do
transforms with variable sizes and a custom fixate_caps function.
This commit is contained in:
Wim Taymans 2005-08-24 11:44:24 +00:00
parent b2c0b3a162
commit 15af2428df
5 changed files with 440 additions and 108 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
ChangeLog
View file

@ -3,6 +3,18 @@
* gst/gstpad.c (gst_pad_fixate_caps): Check if the caps is fixed
already.
2005-08-24 Wim Taymans <wim@fluendo.com>
* gst/base/gstbasetransform.c: (gst_base_transform_init),
(gst_base_transform_transform_caps),
(gst_base_transform_transform_size),
(gst_base_transform_configure_caps), (gst_base_transform_setcaps),
(gst_base_transform_get_size), (gst_base_transform_buffer_alloc),
(gst_base_transform_handle_buffer):
* gst/base/gstbasetransform.h:
Many fixes and new features added by Thomas. Can now also do
transforms with variable sizes and a custom fixate_caps function.
2005-08-24 Wim Taymans <wim@fluendo.com>
* gst/gstbuffer.c: (gst_buffer_new_and_alloc):

230
gst/base/gstbasetransform.c
View file

@ -3,7 +3,7 @@
* 2000 Wim Taymans <wtay@chello.be>
* 2005 Wim Taymans <wim@fluendo.com>
*
* gstbasetransform.c:
* gstbasetransform.c:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
@ -203,6 +203,8 @@ gst_base_transform_init (GstBaseTransform * trans, gpointer g_class)
gst_element_add_pad (GST_ELEMENT (trans), trans->srcpad);
trans->passthrough = FALSE;
trans->delay_configure = FALSE;
trans->pending_configure = FALSE;
trans->out_size = -1;
}
@ -230,7 +232,7 @@ gst_base_transform_transform_caps (GstBaseTransform * trans, GstPad * pad,
gst_caps_append (ret, temp);
} else {
/* we send caps with just one structure to the transform
/* we send caps with just one structure to the transform
* function as this is easier for the element */
for (i = 0; i < gst_caps_get_size (caps); i++) {
GstCaps *nth;
@ -255,6 +257,40 @@ gst_base_transform_transform_caps (GstBaseTransform * trans, GstPad * pad,
return ret;
}
/* by default, this keeps the number of samples in the buffer the same */
guint
gst_base_transform_transform_size (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * incaps,
guint insize, GstCaps * outcaps)
{
guint inunitsize, outunitsize, units;
GstBaseTransformClass *klass;
gint ret = -1;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GST_DEBUG_OBJECT (trans, "asked to transform size %d for caps %"
GST_PTR_FORMAT " to size for caps %" GST_PTR_FORMAT " in direction %d",
insize, incaps, outcaps, direction);
/* if there is a custom transform function, use this */
if (klass->transform_size) {
ret = klass->transform_size (trans, direction, incaps, insize, outcaps);
} else {
inunitsize = gst_base_transform_get_size (trans, incaps);
g_return_val_if_fail (inunitsize != -1, -1);
g_return_val_if_fail (insize % inunitsize == 0, -1);
units = insize / inunitsize;
outunitsize = gst_base_transform_get_size (trans, outcaps);
ret = units * outunitsize;
}
GST_DEBUG_OBJECT (trans, "transformed size %d", ret);
return ret;
}
static GstCaps *
gst_base_transform_getcaps (GstPad * pad)
{
@ -317,7 +353,7 @@ gst_base_transform_configure_caps (GstBaseTransform * trans, GstCaps * in,
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
/* no configure the element with the caps */
/* now configure the element with the caps */
if (klass->set_caps) {
ret = klass->set_caps (trans, in, out);
}
@ -333,6 +369,10 @@ gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
GstPad *otherpad, *otherpeer;
GstCaps *othercaps = NULL;
gboolean ret = TRUE;
gboolean peer_checked = FALSE;
/* caps must be fixed here */
g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
@ -340,24 +380,28 @@ gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
otherpeer = gst_pad_get_peer (otherpad);
if (GST_PAD_IS_IN_SETCAPS (otherpad)) {
ret = TRUE;
/* if we get called recursively, we bail out now to avoid an
* infinite loop. */
if (GST_PAD_IS_IN_SETCAPS (otherpad))
goto done;
}
/* see how we can transform the input caps */
/* see how we can transform the input caps. */
othercaps = gst_base_transform_transform_caps (trans, pad, caps);
/* check if transform is empty */
if (!othercaps || gst_caps_is_empty (othercaps))
goto no_transform;
/* if the othercaps are not fixed, we need to fixate them, first attempt
* is by attempting passthrough if the othercaps are a superset of caps. */
if (!gst_caps_is_fixed (othercaps)) {
GstCaps *temp;
GST_DEBUG_OBJECT (trans,
"transform returned non fixed %" GST_PTR_FORMAT, othercaps);
/* see if the target caps are a superset of the source caps, in this
* case we can try to perform passthrough */
temp = gst_caps_intersect (othercaps, caps);
GST_DEBUG_OBJECT (trans, "intersect returned %" GST_PTR_FORMAT, temp);
if (temp) {
@ -366,9 +410,14 @@ gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
/* try passthrough. we know it's fixed, because caps is fixed */
if (gst_pad_accept_caps (otherpeer, caps)) {
GST_DEBUG_OBJECT (trans, "peer accepted %" GST_PTR_FORMAT, caps);
/* peer accepted unmodified caps, we free the original non-fixed
* caps and work with the passthrough caps */
gst_caps_unref (othercaps);
othercaps = gst_caps_ref (caps);
/* will fall though. calls accept_caps again, should fix that. */
/* mark that we checked othercaps with the peer, this
* makes sure we don't call accept_caps again with these same
* caps */
peer_checked = TRUE;
} else {
GST_DEBUG_OBJECT (trans,
"peer did not accept %" GST_PTR_FORMAT, caps);
@ -378,6 +427,8 @@ gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
}
}
/* second attempt at fixation is done by intersecting with
* the peer caps */
if (!gst_caps_is_fixed (othercaps) && otherpeer) {
/* intersect against what the peer can do */
GstCaps *peercaps;
@ -390,6 +441,7 @@ gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
gst_caps_unref (peercaps);
gst_caps_unref (othercaps);
othercaps = intersect;
peer_checked = FALSE;
GST_DEBUG_OBJECT (trans,
"filtering against peer yields %" GST_PTR_FORMAT, othercaps);
@ -398,45 +450,81 @@ gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
if (gst_caps_is_empty (othercaps))
goto no_transform_possible;
/* third attempt at fixation, call the fixate vmethod and
* ultimately call the pad fixate function. */
if (!gst_caps_is_fixed (othercaps)) {
GstCaps *temp;
GST_DEBUG_OBJECT (trans,
"othercaps now, trying to fixate %" GST_PTR_FORMAT, othercaps);
"trying to fixate %" GST_PTR_FORMAT " on pad %s:%s",
othercaps, GST_DEBUG_PAD_NAME (otherpad));
/* take first possibility and fixate if necessary */
/* since we have no other way to fixate left, we might as well just take
* the first of the caps list and fixate that */
/* FIXME: when fixating using the vmethod, it might make sense to fixate
* each of the caps; but Wim doesn't see a use case for that yet */
temp = gst_caps_copy_nth (othercaps, 0);
gst_caps_unref (othercaps);
othercaps = temp;
gst_pad_fixate_caps (otherpad, othercaps);
peer_checked = FALSE;
if (klass->fixate_caps) {
GST_DEBUG_OBJECT (trans, "trying to fixate %" GST_PTR_FORMAT
" using caps %" GST_PTR_FORMAT
" on pad %s:%s using fixate_caps vmethod", othercaps, caps,
GST_DEBUG_PAD_NAME (otherpad));
klass->fixate_caps (trans, GST_PAD_DIRECTION (pad), caps, othercaps);
}
/* if still not fixed, no other option but to let the default pad fixate
* function do its job */
if (!gst_caps_is_fixed (othercaps)) {
GST_DEBUG_OBJECT (trans, "trying to fixate %" GST_PTR_FORMAT
" on pad %s:%s using gst_pad_fixate_caps", othercaps,
GST_DEBUG_PAD_NAME (otherpad));
gst_pad_fixate_caps (otherpad, othercaps);
}
GST_DEBUG_OBJECT (trans, "after fixating %" GST_PTR_FORMAT, othercaps);
}
/* caps should be fixed now */
/* caps should be fixed now, if not we have to fail. */
if (!gst_caps_is_fixed (othercaps))
goto could_not_fixate;
/* and peer should accept */
if (otherpeer && !gst_pad_accept_caps (otherpeer, othercaps))
/* and peer should accept, don't check again if we already checked the
* othercaps against the peer. */
if (!peer_checked && otherpeer && !gst_pad_accept_caps (otherpeer, othercaps))
goto peer_no_accept;
GST_DEBUG_OBJECT (trans, "got final caps %" GST_PTR_FORMAT, othercaps);
/* we know this will work, we implement the setcaps */
gst_pad_set_caps (otherpad, othercaps);
trans->in_place = gst_caps_is_equal (caps, othercaps);
GST_DEBUG_OBJECT (trans, "in_place: %d", trans->in_place);
/* see if we have to configure the element now */
if (!trans->delay_configure) {
if (pad == trans->sinkpad)
ret = gst_base_transform_configure_caps (trans, caps, othercaps);
else
ret = gst_base_transform_configure_caps (trans, othercaps, caps);
GstCaps *incaps, *outcaps;
/* make sure in and out caps are correct */
if (pad == trans->sinkpad) {
incaps = caps;
outcaps = othercaps;
} else {
incaps = othercaps;
outcaps = caps;
}
/* call configure now */
if (!(ret = gst_base_transform_configure_caps (trans, incaps, outcaps)))
goto failed_configure;
} else {
/* set pending configure, the configure will happen later with the
* caps we set on the pads above. */
trans->pending_configure = TRUE;
}
/* we know this will work, we implement the setcaps */
gst_pad_set_caps (otherpad, othercaps);
done:
if (otherpeer)
gst_object_unref (otherpeer);
@ -476,6 +564,12 @@ peer_no_accept:
ret = FALSE;
goto done;
}
failed_configure:
{
GST_DEBUG_OBJECT (trans, "FAILED to configure caps %" GST_PTR_FORMAT
" to accept %" GST_PTR_FORMAT, otherpad, othercaps);
goto done;
}
}
static guint
@ -487,26 +581,37 @@ gst_base_transform_get_size (GstBaseTransform * trans, GstCaps * caps)
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->get_size) {
res = bclass->get_size (trans, caps);
GST_DEBUG_OBJECT (trans, "get size(%p) returned %d", caps, res);
GST_DEBUG_OBJECT (trans, "get size(%" GST_PTR_FORMAT ") returned %d", caps,
res);
}
return res;
}
/* your upstream peer wants to send you a buffer
* that buffer has the given offset, size and caps
* you're requested to allocate a buffer
*/
static GstFlowReturn
gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GstCaps * caps, GstBuffer ** buf)
{
GstBaseTransform *trans;
GstFlowReturn res;
guint got_size;
guint new_size;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
*buf = NULL;
GST_DEBUG_OBJECT (trans, "allocating a buffer of size %d at offset %"
G_GUINT64_FORMAT, size, offset);
/* before any buffers are pushed, in_place is TRUE; allocating can trigger
* a renegotiation and change that to FALSE */
if (trans->in_place) {
/* request a buffer with the same caps */
GST_DEBUG_OBJECT (trans, "requesting buffer with same caps, size %d", size);
res = gst_pad_alloc_buffer (trans->srcpad, offset, size, caps, buf);
} else {
/* if we are configured, request a buffer with the src caps */
@ -515,13 +620,15 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
if (!srccaps)
goto not_configured;
got_size = gst_base_transform_get_size (trans, srccaps);
if (got_size == -1) {
GST_DEBUG_OBJECT (trans, "calling transform_size");
new_size = gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (pad), caps, size, srccaps);
if (new_size == -1) {
gst_caps_unref (srccaps);
goto unknown_size;
}
res = gst_pad_alloc_buffer (trans->srcpad, offset, got_size, srccaps, buf);
res = gst_pad_alloc_buffer (trans->srcpad, offset, new_size, srccaps, buf);
gst_caps_unref (srccaps);
}
@ -532,33 +639,39 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
buffer. fall through and allocate a buffer corresponding to our sink
caps, if any */
GstCaps *sinkcaps = gst_pad_get_negotiated_caps (trans->sinkpad);
GstCaps *srccaps = gst_pad_get_negotiated_caps (trans->srcpad);
if (!sinkcaps)
goto not_configured;
got_size = gst_base_transform_get_size (trans, sinkcaps);
if (got_size == -1) {
new_size = gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (trans->srcpad), srccaps, GST_BUFFER_SIZE (*buf),
sinkcaps);
if (new_size == -1) {
gst_caps_unref (srccaps);
gst_caps_unref (sinkcaps);
goto unknown_size;
}
if (*buf) {
gst_buffer_unref (*buf);
}
*buf = gst_buffer_new_and_alloc (got_size);
gst_buffer_unref (*buf);
*buf = gst_buffer_new_and_alloc (new_size);
gst_buffer_set_caps (*buf, sinkcaps);
GST_BUFFER_OFFSET (*buf) = offset;
res = GST_FLOW_OK;
gst_caps_unref (srccaps);
gst_caps_unref (sinkcaps);
}
gst_object_unref (trans);
return res;
not_configured:
{
/* let the default allocator handle it */
GST_DEBUG_OBJECT (trans, "not configured");
if (*buf) {
gst_buffer_unref (*buf);
*buf = NULL;
@ -569,6 +682,7 @@ not_configured:
unknown_size:
{
/* let the default allocator handle it */
GST_DEBUG_OBJECT (trans, "unknown size");
if (*buf) {
gst_buffer_unref (*buf);
*buf = NULL;
@ -578,7 +692,6 @@ unknown_size:
}
}
static gboolean
gst_base_transform_event (GstPad * pad, GstEvent * event)
{
@ -624,12 +737,13 @@ gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
{
GstBaseTransformClass *bclass;
GstFlowReturn ret = GST_FLOW_OK;
guint out_size;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (trans->in_place) {
if (bclass->transform_ip) {
/* we do not call make writable here */
/* check if we can do inplace and the buffer is writable */
if (bclass->transform_ip && gst_buffer_is_writable (inbuf)) {
gst_buffer_ref (inbuf);
/* in place transform and subclass supports method */
@ -637,9 +751,11 @@ gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
*outbuf = inbuf;
} else {
/* in place transform and subclass does not support method */
/* in place transform and subclass does not support method or
* buffer is not writable. */
if (bclass->transform) {
/* make a copy of the buffer */
/* make a copy of the buffer. We really need a copy since the
* element might not be able to really do inplace. */
*outbuf = inbuf;
inbuf = gst_buffer_copy (inbuf);
@ -649,15 +765,13 @@ gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
}
}
} else {
/* figure out the output size */
if (trans->out_size == -1) {
/* ask subclass */
trans->out_size = gst_base_transform_get_size (trans,
GST_PAD_CAPS (trans->srcpad));
if (trans->out_size == -1)
/* we have an error */
goto no_size;
}
/* non inplace case, figure out the output size */
out_size = gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (trans->sinkpad), GST_PAD_CAPS (trans->sinkpad),
GST_BUFFER_SIZE (inbuf), GST_PAD_CAPS (trans->srcpad));
if (out_size == -1)
/* we have an error */
goto no_size;
/* we cannot reconfigure the element yet as we are still processing
* the old buffer. We will therefore delay the reconfiguration of the
@ -666,7 +780,7 @@ gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
/* no in place transform, get buffer, this might renegotiate. */
ret = gst_pad_alloc_buffer (trans->srcpad,
GST_BUFFER_OFFSET (inbuf), trans->out_size,
GST_BUFFER_OFFSET (inbuf), out_size,
GST_PAD_CAPS (trans->srcpad), outbuf);
trans->delay_configure = FALSE;
@ -681,10 +795,19 @@ gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
else
ret = GST_FLOW_NOT_SUPPORTED;
if (ret != GST_FLOW_OK)
ret =
/* if we got renegotiated we can configure now */
if (trans->pending_configure) {
gboolean success;
success =
gst_base_transform_configure_caps (trans,
GST_PAD_CAPS (trans->sinkpad), GST_PAD_CAPS (trans->srcpad));
trans->pending_configure = FALSE;
if (!success)
goto configure_failed;
}
}
gst_buffer_unref (inbuf);
@ -705,8 +828,17 @@ no_buffer:
GST_DEBUG_OBJECT (trans, "could not get buffer from pool");
return ret;
}
configure_failed:
{
gst_buffer_unref (inbuf);
GST_DEBUG_OBJECT (trans, "could not negotiate");
return GST_FLOW_NOT_NEGOTIATED;
}
}
/* FIXME, getrange is broken, need to pull range from the other
* end based on the transform_size result.
*/
static GstFlowReturn
gst_base_transform_getrange (GstPad * pad, guint64 offset,
guint length, GstBuffer ** buffer)

38
gst/base/gstbasetransform.h
View file

@ -54,36 +54,64 @@ struct _GstBaseTransform {
gboolean in_place;
guint out_size;
gboolean delay_configure;
gboolean pending_configure;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
/**
* GstBaseTransformClass::transform_caps:
* @pad: the pad
* @caps: the caps
*
* This method should answer the question "given this pad, and given these
* caps, what caps would you allow on the other pad inside your element ?"
*/
struct _GstBaseTransformClass {
GstElementClass parent_class;
/*< public >*/
/* virtual methods for subclasses */
/* given caps on one pad, what can I do on the other pad */
/* given the (non-)fixed simple caps on the pad in the given direction,
* what can I do on the other pad ? */
/* FIXME: change to direction */
GstCaps* (*transform_caps) (GstBaseTransform *trans, GstPad *pad,
GstCaps *caps);
/* given caps on one pad, how would you fixate caps on the other pad ? */
void (*fixate_caps) (GstBaseTransform *trans,
GstPadDirection direction, GstCaps *caps,
GstCaps *othercaps);
/* given the size of a buffer in the given direction with the given caps,
* calculate the
* size of an outgoing buffer with the given outgoing caps; the default
* implementation uses get_size and keeps the number of units the same */
guint (*transform_size) (GstBaseTransform *trans,
GstPadDirection direction,
GstCaps *incaps, guint insize,
GstCaps *outcaps);
/* get the byte size of one unit for a given caps, -1 on error.
* Always needs to be implemented if the transform is not in-place. */
guint (*get_size) (GstBaseTransform *trans, GstCaps *caps);
/* notify the subclass of new caps */
gboolean (*set_caps) (GstBaseTransform *trans, GstCaps *incaps,
GstCaps *outcaps);
/* get the byte size of a given caps, -1 on error */
guint (*get_size) (GstBaseTransform *trans, GstCaps *caps);
/* start and stop processing, ideal for opening/closing the resource */
gboolean (*start) (GstBaseTransform *trans);
gboolean (*stop) (GstBaseTransform *trans);
gboolean (*event) (GstBaseTransform *trans, GstEvent *event);
/* transform one incoming buffer to one outgoing buffer */
/* transform one incoming buffer to one outgoing buffer.
* Always needs to be implemented. */
GstFlowReturn (*transform) (GstBaseTransform *trans, GstBuffer *inbuf,
GstBuffer *outbuf);

230
libs/gst/base/gstbasetransform.c
View file

@ -3,7 +3,7 @@
* 2000 Wim Taymans <wtay@chello.be>
* 2005 Wim Taymans <wim@fluendo.com>
*
* gstbasetransform.c:
* gstbasetransform.c:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
@ -203,6 +203,8 @@ gst_base_transform_init (GstBaseTransform * trans, gpointer g_class)
gst_element_add_pad (GST_ELEMENT (trans), trans->srcpad);
trans->passthrough = FALSE;
trans->delay_configure = FALSE;
trans->pending_configure = FALSE;
trans->out_size = -1;
}
@ -230,7 +232,7 @@ gst_base_transform_transform_caps (GstBaseTransform * trans, GstPad * pad,
gst_caps_append (ret, temp);
} else {
/* we send caps with just one structure to the transform
/* we send caps with just one structure to the transform
* function as this is easier for the element */
for (i = 0; i < gst_caps_get_size (caps); i++) {
GstCaps *nth;
@ -255,6 +257,40 @@ gst_base_transform_transform_caps (GstBaseTransform * trans, GstPad * pad,
return ret;
}
/* by default, this keeps the number of samples in the buffer the same */
guint
gst_base_transform_transform_size (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * incaps,
guint insize, GstCaps * outcaps)
{
guint inunitsize, outunitsize, units;
GstBaseTransformClass *klass;
gint ret = -1;
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
GST_DEBUG_OBJECT (trans, "asked to transform size %d for caps %"
GST_PTR_FORMAT " to size for caps %" GST_PTR_FORMAT " in direction %d",
insize, incaps, outcaps, direction);
/* if there is a custom transform function, use this */
if (klass->transform_size) {
ret = klass->transform_size (trans, direction, incaps, insize, outcaps);
} else {
inunitsize = gst_base_transform_get_size (trans, incaps);
g_return_val_if_fail (inunitsize != -1, -1);
g_return_val_if_fail (insize % inunitsize == 0, -1);
units = insize / inunitsize;
outunitsize = gst_base_transform_get_size (trans, outcaps);
ret = units * outunitsize;
}
GST_DEBUG_OBJECT (trans, "transformed size %d", ret);
return ret;
}
static GstCaps *
gst_base_transform_getcaps (GstPad * pad)
{
@ -317,7 +353,7 @@ gst_base_transform_configure_caps (GstBaseTransform * trans, GstCaps * in,
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
/* no configure the element with the caps */
/* now configure the element with the caps */
if (klass->set_caps) {
ret = klass->set_caps (trans, in, out);
}
@ -333,6 +369,10 @@ gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
GstPad *otherpad, *otherpeer;
GstCaps *othercaps = NULL;
gboolean ret = TRUE;
gboolean peer_checked = FALSE;
/* caps must be fixed here */
g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
klass = GST_BASE_TRANSFORM_GET_CLASS (trans);
@ -340,24 +380,28 @@ gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
otherpeer = gst_pad_get_peer (otherpad);
if (GST_PAD_IS_IN_SETCAPS (otherpad)) {
ret = TRUE;
/* if we get called recursively, we bail out now to avoid an
* infinite loop. */
if (GST_PAD_IS_IN_SETCAPS (otherpad))
goto done;
}
/* see how we can transform the input caps */
/* see how we can transform the input caps. */
othercaps = gst_base_transform_transform_caps (trans, pad, caps);
/* check if transform is empty */
if (!othercaps || gst_caps_is_empty (othercaps))
goto no_transform;
/* if the othercaps are not fixed, we need to fixate them, first attempt
* is by attempting passthrough if the othercaps are a superset of caps. */
if (!gst_caps_is_fixed (othercaps)) {
GstCaps *temp;
GST_DEBUG_OBJECT (trans,
"transform returned non fixed %" GST_PTR_FORMAT, othercaps);
/* see if the target caps are a superset of the source caps, in this
* case we can try to perform passthrough */
temp = gst_caps_intersect (othercaps, caps);
GST_DEBUG_OBJECT (trans, "intersect returned %" GST_PTR_FORMAT, temp);
if (temp) {
@ -366,9 +410,14 @@ gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
/* try passthrough. we know it's fixed, because caps is fixed */
if (gst_pad_accept_caps (otherpeer, caps)) {
GST_DEBUG_OBJECT (trans, "peer accepted %" GST_PTR_FORMAT, caps);
/* peer accepted unmodified caps, we free the original non-fixed
* caps and work with the passthrough caps */
gst_caps_unref (othercaps);
othercaps = gst_caps_ref (caps);
/* will fall though. calls accept_caps again, should fix that. */
/* mark that we checked othercaps with the peer, this
* makes sure we don't call accept_caps again with these same
* caps */
peer_checked = TRUE;
} else {
GST_DEBUG_OBJECT (trans,
"peer did not accept %" GST_PTR_FORMAT, caps);
@ -378,6 +427,8 @@ gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
}
}
/* second attempt at fixation is done by intersecting with
* the peer caps */
if (!gst_caps_is_fixed (othercaps) && otherpeer) {
/* intersect against what the peer can do */
GstCaps *peercaps;
@ -390,6 +441,7 @@ gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
gst_caps_unref (peercaps);
gst_caps_unref (othercaps);
othercaps = intersect;
peer_checked = FALSE;
GST_DEBUG_OBJECT (trans,
"filtering against peer yields %" GST_PTR_FORMAT, othercaps);
@ -398,45 +450,81 @@ gst_base_transform_setcaps (GstPad * pad, GstCaps * caps)
if (gst_caps_is_empty (othercaps))
goto no_transform_possible;
/* third attempt at fixation, call the fixate vmethod and
* ultimately call the pad fixate function. */
if (!gst_caps_is_fixed (othercaps)) {
GstCaps *temp;
GST_DEBUG_OBJECT (trans,
"othercaps now, trying to fixate %" GST_PTR_FORMAT, othercaps);
"trying to fixate %" GST_PTR_FORMAT " on pad %s:%s",
othercaps, GST_DEBUG_PAD_NAME (otherpad));
/* take first possibility and fixate if necessary */
/* since we have no other way to fixate left, we might as well just take
* the first of the caps list and fixate that */
/* FIXME: when fixating using the vmethod, it might make sense to fixate
* each of the caps; but Wim doesn't see a use case for that yet */
temp = gst_caps_copy_nth (othercaps, 0);
gst_caps_unref (othercaps);
othercaps = temp;
gst_pad_fixate_caps (otherpad, othercaps);
peer_checked = FALSE;
if (klass->fixate_caps) {
GST_DEBUG_OBJECT (trans, "trying to fixate %" GST_PTR_FORMAT
" using caps %" GST_PTR_FORMAT
" on pad %s:%s using fixate_caps vmethod", othercaps, caps,
GST_DEBUG_PAD_NAME (otherpad));
klass->fixate_caps (trans, GST_PAD_DIRECTION (pad), caps, othercaps);
}
/* if still not fixed, no other option but to let the default pad fixate
* function do its job */
if (!gst_caps_is_fixed (othercaps)) {
GST_DEBUG_OBJECT (trans, "trying to fixate %" GST_PTR_FORMAT
" on pad %s:%s using gst_pad_fixate_caps", othercaps,
GST_DEBUG_PAD_NAME (otherpad));
gst_pad_fixate_caps (otherpad, othercaps);
}
GST_DEBUG_OBJECT (trans, "after fixating %" GST_PTR_FORMAT, othercaps);
}
/* caps should be fixed now */
/* caps should be fixed now, if not we have to fail. */
if (!gst_caps_is_fixed (othercaps))
goto could_not_fixate;
/* and peer should accept */
if (otherpeer && !gst_pad_accept_caps (otherpeer, othercaps))
/* and peer should accept, don't check again if we already checked the
* othercaps against the peer. */
if (!peer_checked && otherpeer && !gst_pad_accept_caps (otherpeer, othercaps))
goto peer_no_accept;
GST_DEBUG_OBJECT (trans, "got final caps %" GST_PTR_FORMAT, othercaps);
/* we know this will work, we implement the setcaps */
gst_pad_set_caps (otherpad, othercaps);
trans->in_place = gst_caps_is_equal (caps, othercaps);
GST_DEBUG_OBJECT (trans, "in_place: %d", trans->in_place);
/* see if we have to configure the element now */
if (!trans->delay_configure) {
if (pad == trans->sinkpad)
ret = gst_base_transform_configure_caps (trans, caps, othercaps);
else
ret = gst_base_transform_configure_caps (trans, othercaps, caps);
GstCaps *incaps, *outcaps;
/* make sure in and out caps are correct */
if (pad == trans->sinkpad) {
incaps = caps;
outcaps = othercaps;
} else {
incaps = othercaps;
outcaps = caps;
}
/* call configure now */
if (!(ret = gst_base_transform_configure_caps (trans, incaps, outcaps)))
goto failed_configure;
} else {
/* set pending configure, the configure will happen later with the
* caps we set on the pads above. */
trans->pending_configure = TRUE;
}
/* we know this will work, we implement the setcaps */
gst_pad_set_caps (otherpad, othercaps);
done:
if (otherpeer)
gst_object_unref (otherpeer);
@ -476,6 +564,12 @@ peer_no_accept:
ret = FALSE;
goto done;
}
failed_configure:
{
GST_DEBUG_OBJECT (trans, "FAILED to configure caps %" GST_PTR_FORMAT
" to accept %" GST_PTR_FORMAT, otherpad, othercaps);
goto done;
}
}
static guint
@ -487,26 +581,37 @@ gst_base_transform_get_size (GstBaseTransform * trans, GstCaps * caps)
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->get_size) {
res = bclass->get_size (trans, caps);
GST_DEBUG_OBJECT (trans, "get size(%p) returned %d", caps, res);
GST_DEBUG_OBJECT (trans, "get size(%" GST_PTR_FORMAT ") returned %d", caps,
res);
}
return res;
}
/* your upstream peer wants to send you a buffer
* that buffer has the given offset, size and caps
* you're requested to allocate a buffer
*/
static GstFlowReturn
gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GstCaps * caps, GstBuffer ** buf)
{
GstBaseTransform *trans;
GstFlowReturn res;
guint got_size;
guint new_size;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
*buf = NULL;
GST_DEBUG_OBJECT (trans, "allocating a buffer of size %d at offset %"
G_GUINT64_FORMAT, size, offset);
/* before any buffers are pushed, in_place is TRUE; allocating can trigger
* a renegotiation and change that to FALSE */
if (trans->in_place) {
/* request a buffer with the same caps */
GST_DEBUG_OBJECT (trans, "requesting buffer with same caps, size %d", size);
res = gst_pad_alloc_buffer (trans->srcpad, offset, size, caps, buf);
} else {
/* if we are configured, request a buffer with the src caps */
@ -515,13 +620,15 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
if (!srccaps)
goto not_configured;
got_size = gst_base_transform_get_size (trans, srccaps);
if (got_size == -1) {
GST_DEBUG_OBJECT (trans, "calling transform_size");
new_size = gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (pad), caps, size, srccaps);
if (new_size == -1) {
gst_caps_unref (srccaps);
goto unknown_size;
}
res = gst_pad_alloc_buffer (trans->srcpad, offset, got_size, srccaps, buf);
res = gst_pad_alloc_buffer (trans->srcpad, offset, new_size, srccaps, buf);
gst_caps_unref (srccaps);
}
@ -532,33 +639,39 @@ gst_base_transform_buffer_alloc (GstPad * pad, guint64 offset, guint size,
buffer. fall through and allocate a buffer corresponding to our sink
caps, if any */
GstCaps *sinkcaps = gst_pad_get_negotiated_caps (trans->sinkpad);
GstCaps *srccaps = gst_pad_get_negotiated_caps (trans->srcpad);
if (!sinkcaps)
goto not_configured;
got_size = gst_base_transform_get_size (trans, sinkcaps);
if (got_size == -1) {
new_size = gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (trans->srcpad), srccaps, GST_BUFFER_SIZE (*buf),
sinkcaps);
if (new_size == -1) {
gst_caps_unref (srccaps);
gst_caps_unref (sinkcaps);
goto unknown_size;
}
if (*buf) {
gst_buffer_unref (*buf);
}
*buf = gst_buffer_new_and_alloc (got_size);
gst_buffer_unref (*buf);
*buf = gst_buffer_new_and_alloc (new_size);
gst_buffer_set_caps (*buf, sinkcaps);
GST_BUFFER_OFFSET (*buf) = offset;
res = GST_FLOW_OK;
gst_caps_unref (srccaps);
gst_caps_unref (sinkcaps);
}
gst_object_unref (trans);
return res;
not_configured:
{
/* let the default allocator handle it */
GST_DEBUG_OBJECT (trans, "not configured");
if (*buf) {
gst_buffer_unref (*buf);
*buf = NULL;
@ -569,6 +682,7 @@ not_configured:
unknown_size:
{
/* let the default allocator handle it */
GST_DEBUG_OBJECT (trans, "unknown size");
if (*buf) {
gst_buffer_unref (*buf);
*buf = NULL;
@ -578,7 +692,6 @@ unknown_size:
}
}
static gboolean
gst_base_transform_event (GstPad * pad, GstEvent * event)
{
@ -624,12 +737,13 @@ gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
{
GstBaseTransformClass *bclass;
GstFlowReturn ret = GST_FLOW_OK;
guint out_size;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (trans->in_place) {
if (bclass->transform_ip) {
/* we do not call make writable here */
/* check if we can do inplace and the buffer is writable */
if (bclass->transform_ip && gst_buffer_is_writable (inbuf)) {
gst_buffer_ref (inbuf);
/* in place transform and subclass supports method */
@ -637,9 +751,11 @@ gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
*outbuf = inbuf;
} else {
/* in place transform and subclass does not support method */
/* in place transform and subclass does not support method or
* buffer is not writable. */
if (bclass->transform) {
/* make a copy of the buffer */
/* make a copy of the buffer. We really need a copy since the
* element might not be able to really do inplace. */
*outbuf = inbuf;
inbuf = gst_buffer_copy (inbuf);
@ -649,15 +765,13 @@ gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
}
}
} else {
/* figure out the output size */
if (trans->out_size == -1) {
/* ask subclass */
trans->out_size = gst_base_transform_get_size (trans,
GST_PAD_CAPS (trans->srcpad));
if (trans->out_size == -1)
/* we have an error */
goto no_size;
}
/* non inplace case, figure out the output size */
out_size = gst_base_transform_transform_size (trans,
GST_PAD_DIRECTION (trans->sinkpad), GST_PAD_CAPS (trans->sinkpad),
GST_BUFFER_SIZE (inbuf), GST_PAD_CAPS (trans->srcpad));
if (out_size == -1)
/* we have an error */
goto no_size;
/* we cannot reconfigure the element yet as we are still processing
* the old buffer. We will therefore delay the reconfiguration of the
@ -666,7 +780,7 @@ gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
/* no in place transform, get buffer, this might renegotiate. */
ret = gst_pad_alloc_buffer (trans->srcpad,
GST_BUFFER_OFFSET (inbuf), trans->out_size,
GST_BUFFER_OFFSET (inbuf), out_size,
GST_PAD_CAPS (trans->srcpad), outbuf);
trans->delay_configure = FALSE;
@ -681,10 +795,19 @@ gst_base_transform_handle_buffer (GstBaseTransform * trans, GstBuffer * inbuf,
else
ret = GST_FLOW_NOT_SUPPORTED;
if (ret != GST_FLOW_OK)
ret =
/* if we got renegotiated we can configure now */
if (trans->pending_configure) {
gboolean success;
success =
gst_base_transform_configure_caps (trans,
GST_PAD_CAPS (trans->sinkpad), GST_PAD_CAPS (trans->srcpad));
trans->pending_configure = FALSE;
if (!success)
goto configure_failed;
}
}
gst_buffer_unref (inbuf);
@ -705,8 +828,17 @@ no_buffer:
GST_DEBUG_OBJECT (trans, "could not get buffer from pool");
return ret;
}
configure_failed:
{
gst_buffer_unref (inbuf);
GST_DEBUG_OBJECT (trans, "could not negotiate");
return GST_FLOW_NOT_NEGOTIATED;
}
}
/* FIXME, getrange is broken, need to pull range from the other
* end based on the transform_size result.
*/
static GstFlowReturn
gst_base_transform_getrange (GstPad * pad, guint64 offset,
guint length, GstBuffer ** buffer)

38
libs/gst/base/gstbasetransform.h
View file

@ -54,36 +54,64 @@ struct _GstBaseTransform {
gboolean in_place;
guint out_size;
gboolean delay_configure;
gboolean pending_configure;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
/**
* GstBaseTransformClass::transform_caps:
* @pad: the pad
* @caps: the caps
*
* This method should answer the question "given this pad, and given these
* caps, what caps would you allow on the other pad inside your element ?"
*/
struct _GstBaseTransformClass {
GstElementClass parent_class;
/*< public >*/
/* virtual methods for subclasses */
/* given caps on one pad, what can I do on the other pad */
/* given the (non-)fixed simple caps on the pad in the given direction,
* what can I do on the other pad ? */
/* FIXME: change to direction */
GstCaps* (*transform_caps) (GstBaseTransform *trans, GstPad *pad,
GstCaps *caps);
/* given caps on one pad, how would you fixate caps on the other pad ? */
void (*fixate_caps) (GstBaseTransform *trans,
GstPadDirection direction, GstCaps *caps,
GstCaps *othercaps);
/* given the size of a buffer in the given direction with the given caps,
* calculate the
* size of an outgoing buffer with the given outgoing caps; the default
* implementation uses get_size and keeps the number of units the same */
guint (*transform_size) (GstBaseTransform *trans,
GstPadDirection direction,
GstCaps *incaps, guint insize,
GstCaps *outcaps);
/* get the byte size of one unit for a given caps, -1 on error.
* Always needs to be implemented if the transform is not in-place. */
guint (*get_size) (GstBaseTransform *trans, GstCaps *caps);
/* notify the subclass of new caps */
gboolean (*set_caps) (GstBaseTransform *trans, GstCaps *incaps,
GstCaps *outcaps);
/* get the byte size of a given caps, -1 on error */
guint (*get_size) (GstBaseTransform *trans, GstCaps *caps);
/* start and stop processing, ideal for opening/closing the resource */
gboolean (*start) (GstBaseTransform *trans);
gboolean (*stop) (GstBaseTransform *trans);
gboolean (*event) (GstBaseTransform *trans, GstEvent *event);
/* transform one incoming buffer to one outgoing buffer */
/* transform one incoming buffer to one outgoing buffer.
* Always needs to be implemented. */
GstFlowReturn (*transform) (GstBaseTransform *trans, GstBuffer *inbuf,
GstBuffer *outbuf);