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basetransform: move the metadata copy code

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Move the metadata copy code to the default prepare_output_buffer implementation.
This commit is contained in:
Wim Taymans 2011-07-21 16:30:07 +02:00
parent 5253a52cb2
commit f8e75ce406
1 changed files with 92 additions and 82 deletions
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174
libs/gst/base/gstbasetransform.c
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@ -258,14 +258,15 @@ struct _GstBaseTransformPrivate
guint alignment;
};
static GstElementClass *parent_class = NULL;
static void gst_base_transform_class_init (GstBaseTransformClass * klass);
static void gst_base_transform_init (GstBaseTransform * trans,
GstBaseTransformClass * klass);
static GstFlowReturn gst_base_transform_prepare_output_buffer (GstBaseTransform
* trans, GstBuffer * input, GstBuffer ** buf);
/* we can't use G_DEFINE_ABSTRACT_TYPE because we need the klass in the _init
* method to get to the padtemplates */
GType
gst_base_transform_get_type (void)
{
@ -325,6 +326,9 @@ static gboolean gst_base_transform_setcaps (GstBaseTransform * trans,
static gboolean gst_base_transform_query (GstPad * pad, GstQuery * query);
static const GstQueryType *gst_base_transform_query_type (GstPad * pad);
static GstFlowReturn default_prepare_output_buffer (GstBaseTransform * trans,
GstBuffer * in_buf, GstBuffer ** out_buf);
/* static guint gst_base_transform_signals[LAST_SIGNAL] = { 0 }; */
static void
@ -369,6 +373,8 @@ gst_base_transform_class_init (GstBaseTransformClass * klass)
klass->src_event = GST_DEBUG_FUNCPTR (gst_base_transform_src_eventfunc);
klass->accept_caps =
GST_DEBUG_FUNCPTR (gst_base_transform_acceptcaps_default);
klass->prepare_output_buffer =
GST_DEBUG_FUNCPTR (default_prepare_output_buffer);
}
static void
@ -1366,53 +1372,101 @@ default_prepare_output_buffer (GstBaseTransform * trans,
priv = trans->priv;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
/* figure out how to allocate an output buffer */
if (trans->passthrough) {
/* passthrough, we will not modify the incomming buffer so we can just
* reuse it */
GST_DEBUG_OBJECT (trans, "passthrough: reusing input buffer");
*out_buf = in_buf;
} else if (priv->pool) {
GST_DEBUG_OBJECT (trans, "using pool alloc");
ret = gst_buffer_pool_acquire_buffer (priv->pool, out_buf, NULL);
*out_buf = gst_buffer_ref (in_buf);
} else {
gsize insize, outsize;
gboolean res;
gboolean copymeta;
guint mask;
/* no pool, we need to figure out the size of the output buffer first */
insize = gst_buffer_get_size (in_buf);
if (trans->passthrough) {
GST_DEBUG_OBJECT (trans, "doing passthrough alloc");
/* passthrough, the output size is the same as the input size. */
outsize = insize;
/* we can't reuse the input buffer */
if (priv->pool) {
GST_DEBUG_OBJECT (trans, "using pool alloc");
ret = gst_buffer_pool_acquire_buffer (priv->pool, out_buf, NULL);
} else {
gboolean want_in_place = (bclass->transform_ip != NULL)
&& trans->always_in_place;
gsize insize, outsize;
gboolean res;
if (want_in_place) {
GST_DEBUG_OBJECT (trans, "doing inplace alloc");
/* we alloc a buffer of the same size as the input */
/* no pool, we need to figure out the size of the output buffer first */
insize = gst_buffer_get_size (in_buf);
if (trans->passthrough) {
GST_DEBUG_OBJECT (trans, "doing passthrough alloc");
/* passthrough, the output size is the same as the input size. */
outsize = insize;
} else {
GstCaps *incaps, *outcaps;
gboolean want_in_place = (bclass->transform_ip != NULL)
&& trans->always_in_place;
/* else use the transform function to get the size */
incaps = gst_pad_get_current_caps (trans->sinkpad);
outcaps = gst_pad_get_current_caps (trans->srcpad);
if (want_in_place) {
GST_DEBUG_OBJECT (trans, "doing inplace alloc");
/* we alloc a buffer of the same size as the input */
outsize = insize;
} else {
GstCaps *incaps, *outcaps;
GST_DEBUG_OBJECT (trans, "getting output size for alloc");
/* copy transform, figure out the output size */
res = gst_base_transform_transform_size (trans,
GST_PAD_SINK, incaps, insize, outcaps, &outsize);
/* else use the transform function to get the size */
incaps = gst_pad_get_current_caps (trans->sinkpad);
outcaps = gst_pad_get_current_caps (trans->srcpad);
gst_caps_unref (incaps);
gst_caps_unref (outcaps);
GST_DEBUG_OBJECT (trans, "getting output size for alloc");
/* copy transform, figure out the output size */
res = gst_base_transform_transform_size (trans,
GST_PAD_SINK, incaps, insize, outcaps, &outsize);
if (!res)
goto unknown_size;
gst_caps_unref (incaps);
gst_caps_unref (outcaps);
if (!res)
goto unknown_size;
}
}
GST_DEBUG_OBJECT (trans, "doing alloc of size %u", outsize);
*out_buf =
gst_buffer_new_allocate (priv->allocator, outsize, priv->alignment);
}
/* now copy the metadata */
mask = GST_BUFFER_FLAG_PREROLL | GST_BUFFER_FLAG_IN_CAPS |
GST_BUFFER_FLAG_DELTA_UNIT | GST_BUFFER_FLAG_DISCONT |
GST_BUFFER_FLAG_GAP | GST_BUFFER_FLAG_MEDIA1 |
GST_BUFFER_FLAG_MEDIA2 | GST_BUFFER_FLAG_MEDIA3;
/* see if the flags and timestamps match */
copymeta =
(GST_MINI_OBJECT_FLAGS (*out_buf) & mask) !=
(GST_MINI_OBJECT_FLAGS (in_buf) & mask);
copymeta |=
GST_BUFFER_TIMESTAMP (*out_buf) != GST_BUFFER_TIMESTAMP (in_buf) ||
GST_BUFFER_DURATION (*out_buf) != GST_BUFFER_DURATION (in_buf) ||
GST_BUFFER_OFFSET (*out_buf) != GST_BUFFER_OFFSET (in_buf) ||
GST_BUFFER_OFFSET_END (*out_buf) != GST_BUFFER_OFFSET_END (in_buf);
/* we need to modify the metadata when the element is not gap aware,
* passthrough is not used and the gap flag is set */
copymeta |= !priv->gap_aware && !trans->passthrough
&& (GST_MINI_OBJECT_FLAGS (*out_buf) & GST_BUFFER_FLAG_GAP);
if (copymeta) {
GST_DEBUG_OBJECT (trans, "copying metadata");
if (!gst_buffer_is_writable (*out_buf)) {
/* this should not happen, buffers allocated from a pool or with
* new_allocate should always be writable. */
GST_WARNING_OBJECT (trans, "buffer %p not writable", *out_buf);
*out_buf = gst_buffer_make_writable (*out_buf);
}
/* when we get here, the metadata should be writable */
gst_buffer_copy_into (*out_buf, in_buf,
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
/* clear the GAP flag when the subclass does not understand it */
if (!priv->gap_aware)
GST_BUFFER_FLAG_UNSET (*out_buf, GST_BUFFER_FLAG_GAP);
}
GST_DEBUG_OBJECT (trans, "doing alloc of size %u", outsize);
*out_buf =
gst_buffer_new_allocate (priv->allocator, outsize, priv->alignment);
}
return ret;
@ -1440,7 +1494,6 @@ gst_base_transform_prepare_output_buffer (GstBaseTransform * trans,
GstBaseTransformClass *bclass;
GstBaseTransformPrivate *priv;
GstFlowReturn ret = GST_FLOW_OK;
gboolean copymeta;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
@ -1462,10 +1515,10 @@ gst_base_transform_prepare_output_buffer (GstBaseTransform * trans,
* is because we need to make sure that the buffer is writable for the
* in_place transform. The docs of the vmethod say that you should return
* a reffed inbuf, which is exactly what we don't want :), oh well.. */
if (in_buf == *out_buf)
if (in_buf == *out_buf) {
GST_DEBUG_OBJECT (trans, "reusing input buffer");
gst_buffer_unref (in_buf);
if (trans->passthrough && in_buf != *out_buf) {
} else if (trans->passthrough) {
/* we are asked to perform a passthrough transform but the input and
* output buffers are different. We have to discard the output buffer and
* reuse the input buffer. This is rather weird, it means that the prepare
@ -1478,49 +1531,6 @@ gst_base_transform_prepare_output_buffer (GstBaseTransform * trans,
GST_DEBUG_OBJECT (trans, "using allocated buffer in %p, out %p", in_buf,
*out_buf);
/* if we have different buffers, check if the metadata is ok */
copymeta = FALSE;
if (*out_buf != in_buf) {
guint mask;
mask = GST_BUFFER_FLAG_PREROLL | GST_BUFFER_FLAG_IN_CAPS |
GST_BUFFER_FLAG_DELTA_UNIT | GST_BUFFER_FLAG_DISCONT |
GST_BUFFER_FLAG_GAP | GST_BUFFER_FLAG_MEDIA1 |
GST_BUFFER_FLAG_MEDIA2 | GST_BUFFER_FLAG_MEDIA3;
/* see if the flags and timestamps match */
copymeta =
(GST_MINI_OBJECT_FLAGS (*out_buf) & mask) ==
(GST_MINI_OBJECT_FLAGS (in_buf) & mask);
copymeta |=
GST_BUFFER_TIMESTAMP (*out_buf) != GST_BUFFER_TIMESTAMP (in_buf) ||
GST_BUFFER_DURATION (*out_buf) != GST_BUFFER_DURATION (in_buf) ||
GST_BUFFER_OFFSET (*out_buf) != GST_BUFFER_OFFSET (in_buf) ||
GST_BUFFER_OFFSET_END (*out_buf) != GST_BUFFER_OFFSET_END (in_buf);
}
/* we need to modify the metadata when the element is not gap aware,
* passthrough is not used and the gap flag is set */
copymeta |= !priv->gap_aware && !trans->passthrough
&& (GST_MINI_OBJECT_FLAGS (*out_buf) & GST_BUFFER_FLAG_GAP);
if (copymeta) {
GST_DEBUG_OBJECT (trans, "copymeta %d", copymeta);
if (!gst_buffer_is_writable (*out_buf)) {
GST_DEBUG_OBJECT (trans, "buffer %p not writable", *out_buf);
if (in_buf == *out_buf)
*out_buf = gst_buffer_copy (in_buf);
else
*out_buf = gst_buffer_make_writable (*out_buf);
}
/* when we get here, the metadata should be writable */
if (copymeta)
gst_buffer_copy_into (*out_buf, in_buf,
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
/* clear the GAP flag when the subclass does not understand it */
if (!priv->gap_aware)
GST_BUFFER_FLAG_UNSET (*out_buf, GST_BUFFER_FLAG_GAP);
}
return ret;
/* ERRORS */