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basetransform: improve prepare_output_buffer

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Clean up the prepare_output_buffer function.
Reuse the input buffer when it is writable and when doing an
in-place but non-passthrough transform.
Move the copy-metadata function call to the prepare_output_buffer default
function. If subclasses implement a custom prepare_output_buffer, they must also
copy the metadata themselves.
Remove a useless memory copy because prepare_output_buffer already did that.
This commit is contained in:
Wim Taymans 2012-02-02 13:10:27 +01:00
parent dd9cc4295e
commit d6dfb07692
1 changed files with 54 additions and 81 deletions
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135
libs/gst/base/gstbasetransform.c
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@ -1417,6 +1417,9 @@ default_prepare_output_buffer (GstBaseTransform * trans,
GstBaseTransformPrivate *priv;
GstFlowReturn ret = GST_FLOW_OK;
GstBaseTransformClass *bclass;
GstCaps *incaps, *outcaps;
gsize insize, outsize;
gboolean res;
priv = trans->priv;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
@ -1427,49 +1430,58 @@ default_prepare_output_buffer (GstBaseTransform * trans,
* reuse it */
GST_DEBUG_OBJECT (trans, "passthrough: reusing input buffer");
*outbuf = inbuf;
} else {
/* 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, outbuf, NULL);
} else {
gboolean want_in_place;
gsize insize, outsize;
gboolean res;
/* no pool, we need to figure out the size of the output buffer first */
insize = gst_buffer_get_size (inbuf);
want_in_place = (bclass->transform_ip != NULL)
&& trans->always_in_place;
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;
/* 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_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);
gst_caps_unref (incaps);
gst_caps_unref (outcaps);
if (!res)
goto unknown_size;
}
GST_DEBUG_OBJECT (trans, "doing alloc of size %" G_GSIZE_FORMAT, outsize);
*outbuf =
gst_buffer_new_allocate (priv->allocator, outsize, priv->alignment);
}
goto done;
}
/* 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, outbuf, NULL);
goto done;
}
/* no pool, we need to figure out the size of the output buffer first */
if ((bclass->transform_ip != NULL) && trans->always_in_place) {
/* we want to do an in-place alloc */
if (gst_buffer_is_writable (inbuf)) {
GST_DEBUG_OBJECT (trans, "inplace reuse writable input buffer");
*outbuf = inbuf;
} else {
GST_DEBUG_OBJECT (trans, "making writable buffer copy");
/* we make a copy of the input buffer */
*outbuf = gst_buffer_copy (inbuf);
}
goto done;
}
/* 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_DEBUG_OBJECT (trans, "getting output size for alloc");
/* copy transform, figure out the output size */
insize = gst_buffer_get_size (inbuf);
res = gst_base_transform_transform_size (trans,
GST_PAD_SINK, incaps, insize, outcaps, &outsize);
gst_caps_unref (incaps);
gst_caps_unref (outcaps);
if (!res)
goto unknown_size;
GST_DEBUG_OBJECT (trans, "doing alloc of size %" G_GSIZE_FORMAT, outsize);
*outbuf = gst_buffer_new_allocate (priv->allocator, outsize, priv->alignment);
/* copy the metadata */
if (bclass->copy_metadata)
if (!bclass->copy_metadata (trans, inbuf, *outbuf)) {
/* something failed, post a warning */
GST_ELEMENT_WARNING (trans, STREAM, NOT_IMPLEMENTED,
("could not copy metadata"), (NULL));
}
done:
return ret;
/* ERRORS */
@ -1836,26 +1848,6 @@ no_qos:
if (ret != GST_FLOW_OK || *outbuf == NULL)
goto no_buffer;
if (inbuf == *outbuf) {
GST_DEBUG_OBJECT (trans, "reusing input buffer");
} 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
* output buffer does something wrong. */
GST_WARNING_OBJECT (trans, "passthrough but different buffers, check the "
"prepare_output_buffer implementation");
gst_buffer_unref (*outbuf);
*outbuf = inbuf;
} else {
/* copy the metadata */
if (bclass->copy_metadata)
if (!bclass->copy_metadata (trans, inbuf, *outbuf)) {
/* something failed, post a warning */
GST_ELEMENT_WARNING (trans, STREAM, NOT_IMPLEMENTED,
("could not copy metadata"), (NULL));
}
}
GST_DEBUG_OBJECT (trans, "using allocated buffer in %p, out %p", inbuf,
*outbuf);
@ -1875,25 +1867,6 @@ no_qos:
if (want_in_place) {
GST_DEBUG_OBJECT (trans, "doing inplace transform");
if (inbuf != *outbuf) {
GstMapInfo ininfo, outinfo;
/* Different buffer. The data can still be the same when we are dealing
* with subbuffers of the same buffer. Note that because of the FIXME in
* prepare_output_buffer() we have decreased the refcounts of inbuf and
* outbuf to keep them writable */
if (gst_buffer_map (inbuf, &ininfo, GST_MAP_READ)) {
if (gst_buffer_map (*outbuf, &outinfo, GST_MAP_WRITE)) {
if (ininfo.data != outinfo.data)
memcpy (outinfo.data, ininfo.data, ininfo.size);
gst_buffer_unmap (*outbuf, &outinfo);
}
gst_buffer_unmap (inbuf, &ininfo);
}
}
ret = bclass->transform_ip (trans, *outbuf);
} else {
GST_DEBUG_OBJECT (trans, "doing non-inplace transform");