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libs/gst/base/gstbasetransform.c: Make sure the buffer we pass to transform_ip has a refcount of 1 and thus is writab...

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Original commit message from CVS:
* libs/gst/base/gstbasetransform.c:
(gst_base_transform_prepare_output_buffer),
(gst_base_transform_buffer_alloc),
(gst_base_transform_handle_buffer):
Make sure the buffer we pass to transform_ip has a refcount of
1 and thus is writable. Fixes #343196
This commit is contained in:
Wim Taymans 2006-07-05 08:16:12 +00:00
parent 16ac778f31
commit d7c7dcc686
2 changed files with 36 additions and 4 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2006-07-05 Wim Taymans <wim@fluendo.com>
* libs/gst/base/gstbasetransform.c:
(gst_base_transform_prepare_output_buffer),
(gst_base_transform_buffer_alloc),
(gst_base_transform_handle_buffer):
Make sure the buffer we pass to transform_ip has a refcount of
1 and thus is writable. Fixes #343196
2006-07-04 Jan Schmidt <thaytan@mad.scientist.com>
* plugins/elements/gstfilesrc.c: (gst_file_src_class_init),

31
libs/gst/base/gstbasetransform.c
View file

@ -858,6 +858,10 @@ failed_configure:
/* Allocate a buffer using gst_pad_alloc_buffer
*
* This function does not do renegotiation on the source pad
*
* The output buffer is always writable. outbuf can be equal to
* inbuf, the caller should be prepared for this and perform
* appropriate refcounting.
*/
static GstFlowReturn
gst_base_transform_prepare_output_buffer (GstBaseTransform * trans,
@ -873,6 +877,7 @@ gst_base_transform_prepare_output_buffer (GstBaseTransform * trans,
* the old buffer. We will therefore delay the reconfiguration of the
* element until we have processed this last buffer. */
trans->delay_configure = TRUE;
/* out_caps is the caps of the src pad gathered through the GST_PAD_CAPS
macro. If a set_caps occurs during this function this caps will become
invalid. We want to keep them during preparation of the output buffer. */
@ -886,6 +891,13 @@ gst_base_transform_prepare_output_buffer (GstBaseTransform * trans,
out_buf);
if (ret != GST_FLOW_OK)
goto done;
/* decrease refcount again if vmethod returned refcounted in_buf. This
* 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)
gst_buffer_unref (in_buf);
}
/* See if we want to prepare the buffer for in place output */
@ -893,18 +905,24 @@ gst_base_transform_prepare_output_buffer (GstBaseTransform * trans,
&& bclass->transform_ip) {
if (gst_buffer_is_writable (in_buf)) {
if (trans->have_same_caps) {
/* Input buffer is already writable and caps are the same, just ref and return it */
/* Input buffer is already writable and caps are the same, return input as
* output buffer. We don't take an additional ref since that would make the
* output buffer not writable anymore. Caller should be prepared to deal
* with proper refcounting of input/output buffers. */
*out_buf = in_buf;
gst_buffer_ref (in_buf);
GST_LOG_OBJECT (trans, "reuse input buffer");
} else {
/* Writable buffer, but need to change caps => subbuffer */
*out_buf = gst_buffer_create_sub (in_buf, 0, GST_BUFFER_SIZE (in_buf));
gst_caps_replace (&GST_BUFFER_CAPS (*out_buf), out_caps);
GST_LOG_OBJECT (trans, "created sub-buffer of input buffer");
}
/* we are done now */
goto done;
} else {
/* Make a writable buffer below and copy the data */
copy_inbuf = TRUE;
GST_LOG_OBJECT (trans, "need to copy input buffer to new output buffer");
}
}
@ -941,6 +959,7 @@ gst_base_transform_prepare_output_buffer (GstBaseTransform * trans,
done:
if (out_caps)
gst_caps_unref (out_caps);
trans->delay_configure = FALSE;
return ret;
@ -1369,8 +1388,11 @@ no_qos:
if (!success)
goto configure_failed;
}
skip:
gst_buffer_unref (inbuf);
/* only unref input buffer if we allocated a new outbuf buffer */
if (*outbuf != inbuf)
gst_buffer_unref (inbuf);
return ret;
@ -1399,7 +1421,8 @@ no_buffer:
}
configure_failed:
{
gst_buffer_unref (inbuf);
if (*outbuf != inbuf)
gst_buffer_unref (inbuf);
GST_DEBUG_OBJECT (trans, "could not negotiate");
return GST_FLOW_NOT_NEGOTIATED;
}