From 28d1d048a603082b5acf50c0d59ecfd039b46a6d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?V=C3=ADctor=20Manuel=20J=C3=A1quez=20Leal?=
 <vjaquez@igalia.com>
Date: Wed, 14 Jun 2017 18:30:53 +0200
Subject: [PATCH] libs: decoder: h264: add getter/setter for low latency mode

https://bugzilla.gnome.org/show_bug.cgi?id=783588
---
 gst-libs/gst/vaapi/gstvaapidecoder_h264.c | 38 +++++++++++++++++++++++
 gst-libs/gst/vaapi/gstvaapidecoder_h264.h |  7 +++++
 2 files changed, 45 insertions(+)

diff --git a/gst-libs/gst/vaapi/gstvaapidecoder_h264.c b/gst-libs/gst/vaapi/gstvaapidecoder_h264.c
index 678e952f4c..18df327da9 100644
--- a/gst-libs/gst/vaapi/gstvaapidecoder_h264.c
+++ b/gst-libs/gst/vaapi/gstvaapidecoder_h264.c
@@ -528,6 +528,8 @@ struct _GstVaapiDecoderH264Private
   guint has_context:1;
   guint progressive_sequence:1;
   guint top_field_first:1;
+
+  gboolean force_low_latency;
 };
 
 /**
@@ -4732,6 +4734,42 @@ gst_vaapi_decoder_h264_set_alignment (GstVaapiDecoderH264 * decoder,
   decoder->priv.stream_alignment = alignment;
 }
 
+/**
+ * gst_vaapi_decoder_h264_set_low_latency:
+ * @decoder: a #GstVaapiDecoderH264
+ * @force_low_latency: %TRUE if force low latency
+ *
+ * if @force_low_latency is %TRUE the decoded frames are pushed soon
+ * as possible, instead of to wait until decoded picture buffer (DPB)
+ * release them.
+ *
+ * This violate the H.264 specification but it is useful for some live
+ * sources.
+ **/
+void
+gst_vaapi_decoder_h264_set_low_latency (GstVaapiDecoderH264 * decoder,
+    gboolean force_low_latency)
+{
+  g_return_if_fail (decoder != NULL);
+
+  decoder->priv.force_low_latency = force_low_latency;
+}
+
+/**
+ * gst_vaapi_decoder_h264_get_low_latency:
+ * @decoder: a #GstVaapiDecoderH264
+ *
+ * Returns: %TRUE if the low latency mode is enabled; otherwise
+ * %FALSE.
+ **/
+gboolean
+gst_vaapi_decoder_h264_get_low_latency (GstVaapiDecoderH264 * decoder)
+{
+  g_return_val_if_fail (decoder != NULL, FALSE);
+
+  return decoder->priv.force_low_latency;
+}
+
 /**
  * gst_vaapi_decoder_h264_new:
  * @display: a #GstVaapiDisplay
diff --git a/gst-libs/gst/vaapi/gstvaapidecoder_h264.h b/gst-libs/gst/vaapi/gstvaapidecoder_h264.h
index f9949dd126..9ca65cfc99 100644
--- a/gst-libs/gst/vaapi/gstvaapidecoder_h264.h
+++ b/gst-libs/gst/vaapi/gstvaapidecoder_h264.h
@@ -55,6 +55,13 @@ void
 gst_vaapi_decoder_h264_set_alignment(GstVaapiDecoderH264 *decoder,
     GstVaapiStreamAlignH264 alignment);
 
+gboolean
+gst_vaapi_decoder_h264_get_low_latency(GstVaapiDecoderH264 * decoder);
+
+void
+gst_vaapi_decoder_h264_set_low_latency(GstVaapiDecoderH264 * decoder,
+    gboolean force_low_latency);
+
 G_END_DECLS
 
 #endif /* GST_VAAPI_DECODER_H264_H */