video-converter: Set up gamma tables only once

When the video converter is using multiple threads, the gamma tables
were created multiple times, leaking the tables set up for the previous
thread.

Only calculate the tables once.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1140>

diff --git a/gst-libs/gst/video/video-converter.c b/gst-libs/gst/video/video-converter.c
index c2c9c81..aa4740d 100644 (file)
--- a/gst-libs/gst/video/video-converter.c
+++ b/gst-libs/gst/video/video-converter.c
@@ -1506,7 +1506,9 @@ setup_gamma_decode (GstVideoConverter * convert)
   func = convert->in_info.colorimetry.transfer;
 
   convert->gamma_dec.width = convert->current_width;
-  if (convert->current_bits == 8) {
+  if (convert->gamma_dec.gamma_table) {
+    GST_DEBUG ("gamma decode already set up");
+  } else if (convert->current_bits == 8) {
     GST_DEBUG ("gamma decode 8->16: %d", func);
     convert->gamma_dec.gamma_func = gamma_convert_u8_u16;
     t = convert->gamma_dec.gamma_table = g_malloc (sizeof (guint16) * 256);
@@ -1538,7 +1540,9 @@ setup_gamma_encode (GstVideoConverter * convert, gint target_bits)
   func = convert->out_info.colorimetry.transfer;
 
   convert->gamma_enc.width = convert->current_width;
-  if (target_bits == 8) {
+  if (convert->gamma_enc.gamma_table) {
+    GST_DEBUG ("gamma encode already set up");
+  } else if (target_bits == 8) {
     guint8 *t;
 
     GST_DEBUG ("gamma encode 16->8: %d", func);