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/* Output buffer preparation... if the buffer has no caps, and
 * our allowed output caps is fixed, then give the caps to the
 * buffer.
 * This ensures that outgoing buffers have caps if we can, so
 * that pipelines like:
 *   gst-launch filesrc location=3Drawsamples.raw !
 *       audio/x-raw-int,width=3D16,depth=3D16,rate=3D48000,channels=3D2,
 *       endianness=3D4321,signed=3D'(boolean)'true ! alsasink
 * will work.
 */
static GstFlowReturn
gst_capsfilter_prepare_buf (GstBaseTransform * trans, GstBuffer * input,
    gint size, GstCaps * caps, GstBuffer ** buf)
{
  if (GST_BUFFER_CAPS (input) !=3D NULL) {
    /* Output buffer already has caps */
    GST_DEBUG_OBJECT (trans, "Input buffer already has caps");
    gst_buffer_ref (input);
    *buf =3D input;
  } else {
    /* Buffer has no caps. See if the output pad only supports fixed caps=
 */
    GstCaps *out_caps;

    ......
   }

Cheers
 -Tim


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