/**
* gst_memory_resize:
* @mem: a #GstMemory
* @offset: a new offset
* @size: a new size
*
* Resize the memory region. @mem should be writable and offset + size should be
* less than the maxsize of @mem.
*
* #GST_MEMORY_FLAG_ZERO_PREFIXED and #GST_MEMORY_FLAG_ZERO_PADDED will be
* cleared when offset or padding is increased respectively.
*/
void
gst_memory_resize (GstMemory * mem, gssize offset, gsize size)
{
g_return_if_fail (mem != NULL);
g_return_if_fail (gst_memory_is_writable (mem));
g_return_if_fail (offset >= 0 || mem->offset >= -offset);
g_return_if_fail (size + mem->offset + offset <= mem->maxsize);
/* if we increase the prefix, we can't guarantee it is still 0 filled */
if ((offset > 0) && GST_MEMORY_IS_ZERO_PREFIXED (mem))
GST_MEMORY_FLAG_UNSET (mem, GST_MEMORY_FLAG_ZERO_PREFIXED);
/* if we increase the padding, we can't guarantee it is still 0 filled */
if ((offset + size < mem->size) && GST_MEMORY_IS_ZERO_PADDED (mem))
GST_MEMORY_FLAG_UNSET (mem, GST_MEMORY_FLAG_ZERO_PADDED);
mem->offset += offset;
mem->size = size;
}
static gboolean
gst_v4l2_is_buffer_valid (GstBuffer * buffer, GstV4l2MemoryGroup ** out_group)
{
GstMemory *mem = gst_buffer_peek_memory (buffer, 0);
gboolean valid = FALSE;
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY))
goto done;
if (gst_is_dmabuf_memory (mem))
mem = gst_mini_object_get_qdata (GST_MINI_OBJECT (mem),
GST_V4L2_MEMORY_QUARK);
if (mem && gst_is_v4l2_memory (mem)) {
GstV4l2Memory *vmem = (GstV4l2Memory *) mem;
GstV4l2MemoryGroup *group = vmem->group;
gint i;
if (group->n_mem != gst_buffer_n_memory (buffer))
goto done;
for (i = 0; i < group->n_mem; i++) {
if (group->mem[i] != gst_buffer_peek_memory (buffer, i))
goto done;
if (!gst_memory_is_writable (group->mem[i]))
goto done;
}
valid = TRUE;
if (out_group)
*out_group = group;
}
done:
return valid;
}
