/**
* _gst_caps_set_buffer_array:
* @caps: a #GstCaps
* @field: field in caps to set
* @buf: header buffers
*
* Adds given buffers to an array of buffers set as the given @field
* on the given @caps. List of buffer arguments must be NULL-terminated.
*
* Returns: input caps with a streamheader field added, or NULL if some error
*/
static GstCaps *
_gst_caps_set_buffer_array (GstCaps * caps, const gchar * field,
GstBuffer * buf, ...)
{
GstStructure *structure = NULL;
va_list va;
GValue array = { 0 };
GValue value = { 0 };
g_return_val_if_fail (caps != NULL, NULL);
g_return_val_if_fail (gst_caps_is_fixed (caps), NULL);
g_return_val_if_fail (field != NULL, NULL);
caps = gst_caps_make_writable (caps);
structure = gst_caps_get_structure (caps, 0);
g_value_init (&array, GST_TYPE_ARRAY);
va_start (va, buf);
/* put buffers in a fixed list */
while (buf) {
g_assert (gst_buffer_is_metadata_writable (buf));
/* mark buffer */
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_IN_CAPS);
g_value_init (&value, GST_TYPE_BUFFER);
buf = gst_buffer_copy (buf);
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_IN_CAPS);
gst_value_set_buffer (&value, buf);
gst_buffer_unref (buf);
gst_value_array_append_value (&array, &value);
g_value_unset (&value);
buf = va_arg (va, GstBuffer *);
}
gst_structure_set_value (structure, field, &array);
g_value_unset (&array);
return caps;
}
static GstFlowReturn
gst_identity_prepare_output_buffer (GstBaseTransform * trans,
GstBuffer * in_buf, gint out_size, GstCaps * out_caps, GstBuffer ** out_buf)
{
GstIdentity *identity = GST_IDENTITY (trans);
/* only bother if we may have to alter metadata */
if (identity->datarate > 0 || identity->single_segment) {
if (gst_buffer_is_metadata_writable (in_buf))
*out_buf = gst_buffer_ref (in_buf);
else {
/* make even less writable */
gst_buffer_ref (in_buf);
/* extra ref is dropped going through the official process */
*out_buf = gst_buffer_make_metadata_writable (in_buf);
}
} else
*out_buf = gst_buffer_ref (in_buf);
return GST_FLOW_OK;
}
/**
* gst_buffer_copy_metadata:
* @dest: a destination #GstBuffer
* @src: a source #GstBuffer
* @flags: flags indicating what metadata fields should be copied.
*
* Copies the metadata from @src into @dest. The data, size and mallocdata
* fields are not copied.
*
* @flags indicate which fields will be copied. Use #GST_BUFFER_COPY_ALL to copy
* all the metadata fields.
*
* This function is typically called from a custom buffer copy function after
* creating @dest and setting the data, size, mallocdata.
*
* Since: 0.10.13
*/
void
gst_buffer_copy_metadata (GstBuffer * dest, const GstBuffer * src,
GstBufferCopyFlags flags)
{
g_return_if_fail (dest != NULL);
g_return_if_fail (src != NULL);
/* nothing to copy if the buffers are the same */
if (G_UNLIKELY (dest == src))
return;
#if GST_VERSION_NANO == 1
/* we enable this extra debugging in git versions only for now */
g_return_if_fail (gst_buffer_is_metadata_writable (dest));
#endif
GST_CAT_LOG (GST_CAT_BUFFER, "copy %p to %p", src, dest);
if (flags & GST_BUFFER_COPY_FLAGS) {
guint mask;
/* copy relevant flags */
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;
GST_MINI_OBJECT_FLAGS (dest) |= GST_MINI_OBJECT_FLAGS (src) & mask;
}
if (flags & GST_BUFFER_COPY_TIMESTAMPS) {
GST_BUFFER_TIMESTAMP (dest) = GST_BUFFER_TIMESTAMP (src);
GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
}
if (flags & GST_BUFFER_COPY_CAPS) {
gst_caps_replace (&GST_BUFFER_CAPS (dest), GST_BUFFER_CAPS (src));
}
}
/* 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=rawsamples.raw !
* audio/x-raw-int,width=16,depth=16,rate=48000,channels=2,
* endianness=4321,signed='(boolean)'true ! alsasink
* will work.
*/
static GstFlowReturn
gst_capsfilter_prepare_buf (GstBaseTransform * trans, GstBuffer * input,
gint size, GstCaps * caps, GstBuffer ** buf)
{
GstFlowReturn ret = GST_FLOW_OK;
if (GST_BUFFER_CAPS (input) != NULL) {
/* Output buffer already has caps */
GST_LOG_OBJECT (trans, "Input buffer already has caps (implicitely fixed)");
/* FIXME : Move this behaviour to basetransform. The given caps are the ones
* of the source pad, therefore our outgoing buffers should always have
* those caps. */
gst_buffer_set_caps (input, caps);
gst_buffer_ref (input);
*buf = input;
} else {
/* Buffer has no caps. See if the output pad only supports fixed caps */
GstCaps *out_caps;
out_caps = GST_PAD_CAPS (trans->srcpad);
if (out_caps != NULL) {
gst_caps_ref (out_caps);
} else {
out_caps = gst_pad_get_allowed_caps (trans->srcpad);
g_return_val_if_fail (out_caps != NULL, GST_FLOW_ERROR);
}
out_caps = gst_caps_make_writable (out_caps);
gst_caps_do_simplify (out_caps);
if (gst_caps_is_fixed (out_caps) && !gst_caps_is_empty (out_caps)) {
GST_DEBUG_OBJECT (trans, "Have fixed output caps %"
GST_PTR_FORMAT " to apply to buffer with no caps", out_caps);
if (gst_buffer_is_metadata_writable (input)) {
gst_buffer_ref (input);
*buf = input;
} else {
GST_DEBUG_OBJECT (trans, "Creating sub-buffer and setting caps");
*buf = gst_buffer_create_sub (input, 0, GST_BUFFER_SIZE (input));
}
GST_BUFFER_CAPS (*buf) = out_caps;
if (GST_PAD_CAPS (trans->srcpad) == NULL)
gst_pad_set_caps (trans->srcpad, out_caps);
} else {
gchar *caps_str = gst_caps_to_string (out_caps);
GST_DEBUG_OBJECT (trans, "Cannot choose caps. Have unfixed output caps %"
GST_PTR_FORMAT, out_caps);
gst_caps_unref (out_caps);
ret = GST_FLOW_ERROR;
GST_ELEMENT_ERROR (trans, STREAM, FORMAT,
("Filter caps do not completely specify the output format"),
("Output caps are unfixed: %s", caps_str));
g_free (caps_str);
}
}
return ret;
}
