checksumsink: add "hash" property and allow more checksum types

Now any GChecksumType can be used by GstChecksumSink, adding
support for MD5, SHA-256 and SHA-512 in addition to SHA-1.

https://bugzilla.gnome.org/show_bug.cgi?id=763006

gst/debugutils/gstchecksumsink.c

@@ -25,6 +25,10 @@
 #include <gst/base/gstbasesink.h>
 #include "gstchecksumsink.h"
 
+static void gst_checksum_sink_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_checksum_sink_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
 static void gst_checksum_sink_dispose (GObject * object);
 static void gst_checksum_sink_finalize (GObject * object);
 
@@ -33,6 +37,12 @@ static gboolean gst_checksum_sink_stop (GstBaseSink * sink);
 static GstFlowReturn
 gst_checksum_sink_render (GstBaseSink * sink, GstBuffer * buffer);
 
+enum
+{
+  PROP_0,
+  PROP_HASH,
+};
+
 static GstStaticPadTemplate gst_checksum_sink_sink_template =
 GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
@@ -47,6 +57,26 @@ GST_STATIC_PAD_TEMPLATE ("src",
 
 /* class initialization */
 
+#define GST_TYPE_CHECKSUM_SINK_HASH (gst_checksum_sink_hash_get_type ())
+static GType
+gst_checksum_sink_hash_get_type (void)
+{
+  static GType gtype = 0;
+
+  if (gtype == 0) {
+    static const GEnumValue values[] = {
+      {G_CHECKSUM_MD5, "MD5", "md5"},
+      {G_CHECKSUM_SHA1, "SHA-1", "sha1"},
+      {G_CHECKSUM_SHA256, "SHA-256", "sha256"},
+      {G_CHECKSUM_SHA512, "SHA-512", "sha512"},
+      {0, NULL, NULL},
+    };
+
+    gtype = g_enum_register_static ("GstChecksumSinkHash", values);
+  }
+  return gtype;
+}
+
 #define gst_checksum_sink_parent_class parent_class
 G_DEFINE_TYPE (GstChecksumSink, gst_checksum_sink, GST_TYPE_BASE_SINK);
 
@@ -57,6 +87,8 @@ gst_checksum_sink_class_init (GstChecksumSinkClass * klass)
   GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
   GstBaseSinkClass *base_sink_class = GST_BASE_SINK_CLASS (klass);
 
+  gobject_class->set_property = gst_checksum_sink_set_property;
+  gobject_class->get_property = gst_checksum_sink_get_property;
   gobject_class->dispose = gst_checksum_sink_dispose;
   gobject_class->finalize = gst_checksum_sink_finalize;
   base_sink_class->start = GST_DEBUG_FUNCPTR (gst_checksum_sink_start);
@@ -68,6 +100,11 @@ gst_checksum_sink_class_init (GstChecksumSinkClass * klass)
   gst_element_class_add_static_pad_template (element_class,
       &gst_checksum_sink_sink_template);
 
+  g_object_class_install_property (gobject_class, PROP_HASH,
+      g_param_spec_enum ("hash", "Hash", "Checksum type",
+          gst_checksum_sink_hash_get_type (), G_CHECKSUM_SHA1,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
   gst_element_class_set_static_metadata (element_class, "Checksum sink",
       "Debug/Sink", "Calculates a checksum for buffers",
       "David Schleef <ds@schleef.org>");
@@ -77,15 +114,48 @@ static void
 gst_checksum_sink_init (GstChecksumSink * checksumsink)
 {
   gst_base_sink_set_sync (GST_BASE_SINK (checksumsink), FALSE);
+  checksumsink->hash = G_CHECKSUM_SHA1;
 }
 
-void
+static void
+gst_checksum_sink_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstChecksumSink *checksumsink = GST_CHECKSUM_SINK (object);
+
+  switch (prop_id) {
+    case PROP_HASH:
+      checksumsink->hash = g_value_get_enum (value);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_checksum_sink_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstChecksumSink *checksumsink = GST_CHECKSUM_SINK (object);
+
+  switch (prop_id) {
+    case PROP_HASH:
+      g_value_set_enum (value, checksumsink->hash);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
 gst_checksum_sink_dispose (GObject * object)
 {
   G_OBJECT_CLASS (parent_class)->dispose (object);
 }
 
-void
+static void
 gst_checksum_sink_finalize (GObject * object)
 {
   G_OBJECT_CLASS (parent_class)->finalize (object);
@@ -108,9 +178,11 @@ gst_checksum_sink_render (GstBaseSink * sink, GstBuffer * buffer)
 {
   gchar *s;
   GstMapInfo map;
+  GstChecksumSink *checksumsink;
 
+  checksumsink = GST_CHECKSUM_SINK (sink);
   gst_buffer_map (buffer, &map, GST_MAP_READ);
-  s = g_compute_checksum_for_data (G_CHECKSUM_SHA1, map.data, map.size);
+  s = g_compute_checksum_for_data (checksumsink->hash, map.data, map.size);
   gst_buffer_unmap (buffer, &map);
   g_print ("%" GST_TIME_FORMAT " %s\n",
       GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)), s);

gst/debugutils/gstchecksumsink.h

@@ -37,7 +37,7 @@ typedef struct _GstChecksumSinkClass GstChecksumSinkClass;
 struct _GstChecksumSink
 {
   GstBaseSink base_checksumsink;
-
+  GChecksumType hash;
 };
 
 struct _GstChecksumSinkClass