adding structure setters matching the templates for audio

Original commit message from CVS:
adding structure setters matching the templates for audio

3 files changed, 98 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 58fe7467..f4b50423 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2004-01-12  Thomas Vander Stichele  <thomas at apestaart dot org>
+
+	* gst-libs/gst/audio/audio.c: (_gst_audio_structure_set_list),
+	(gst_audio_structure_set_int):
+	* gst-libs/gst/audio/audio.h:
+          add helper functions for _getcaps matching the standard audio
+          templates
+
 2004-01-12  David Schleef  <ds@schleef.org>
 
 	* gst/audioconvert/gstaudioconvert.c: (gst_audio_convert_link):
diff --git a/gst-libs/gst/audio/audio.c b/gst-libs/gst/audio/audio.c
index e1d59220..d467af49 100644
--- a/gst-libs/gst/audio/audio.c
+++ b/gst-libs/gst/audio/audio.c
@@ -23,6 +23,8 @@
 
 #include "audio.h"
 
+#include <gst/gststructure.h>
+
 int
 gst_audio_frame_byte_size (GstPad* pad)
 {
@@ -185,6 +187,81 @@ gst_audio_is_buffer_framed (GstPad* pad, GstBuffer* buf)
     return FALSE;
 }
 
+/* _getcaps helper functions
+ * sets structure fields to default for audio type
+ * flag determines which structure fields to set to default
+ * keep these functions in sync with the templates in audio.h
+ */
+
+/* private helper function
+ * sets a list on the structure
+ * pass in structure, fieldname for the list, type of the list values,
+ * number of list values, and each of the values, terminating with NULL
+ */
+static void
+_gst_audio_structure_set_list (GstStructure *structure, const gchar *fieldname,
+                               GType type, int number, ...)
+{
+  va_list varargs;
+  GValue value = { 0 };
+  GArray *array;
+  int j;
+
+  g_return_if_fail (structure != NULL);
+
+  g_value_init (&value, GST_TYPE_LIST);
+  array = g_value_peek_pointer (&value);
+
+  va_start (varargs, number);
+
+  for (j = 0; j < number; ++j)
+  {
+    int i;
+    gboolean b;
+
+    GValue list_value = { 0 };
+
+    switch (type)
+    {
+      case G_TYPE_INT:
+        i = va_arg (varargs, int);
+        g_value_init (&list_value, G_TYPE_INT);
+        g_value_set_int (&list_value, i);
+        break;
+      case G_TYPE_BOOLEAN:
+        b = va_arg (varargs, gboolean);
+        g_value_init (&list_value, G_TYPE_BOOLEAN);
+        g_value_set_boolean (&list_value, b);
+        break;
+       default:
+        g_warning ("_gst_audio_structure_set_list: LIST of given type not implemented.");
+    }
+    g_array_append_val (array, list_value);
+
+  }
+  gst_structure_set_value (structure, fieldname, &value);
+  va_end (varargs);
+}
+
+void
+gst_audio_structure_set_int (GstStructure *structure, GstAudioFieldFlag flag)
+{
+  if (flag & GST_AUDIO_FIELD_RATE)
+    gst_structure_set (structure, "rate", GST_TYPE_INT_RANGE, 1, G_MAXINT, NULL);
+  if (flag & GST_AUDIO_FIELD_CHANNELS)
+    gst_structure_set (structure, "channels", GST_TYPE_INT_RANGE, 1, G_MAXINT, NULL);
+  if (flag & GST_AUDIO_FIELD_ENDIANNESS)
+    _gst_audio_structure_set_list (structure, "endianness", G_TYPE_INT, 2, G_LITTLE_ENDIAN, G_BIG_ENDIAN, NULL);
+  if (flag & GST_AUDIO_FIELD_WIDTH)
+    _gst_audio_structure_set_list (structure, "width", G_TYPE_INT, 3, 8, 16, 32, NULL);
+  if (flag & GST_AUDIO_FIELD_DEPTH)
+    gst_structure_set (structure, "depth", GST_TYPE_INT_RANGE, 1, 32, NULL);
+  if (flag & GST_AUDIO_FIELD_SIGNED)
+    _gst_audio_structure_set_list (structure, "signed", G_TYPE_BOOLEAN, 2, TRUE, FALSE, NULL);
+  if (flag & GST_AUDIO_FIELD_BUFFER_FRAMES)
+    gst_structure_set (structure, "buffer-frames", GST_TYPE_INT_RANGE, 1, G_MAXINT, NULL);
+}
+
 static gboolean
 plugin_init (GstPlugin *plugin)
 {
diff --git a/gst-libs/gst/audio/audio.h b/gst-libs/gst/audio/audio.h
index 73a4043f..1b761026 100644
--- a/gst-libs/gst/audio/audio.h
+++ b/gst-libs/gst/audio/audio.h
@@ -111,5 +111,18 @@ long     gst_audio_highest_sample_value (GstPad* pad);
 /* check if the buffer size is a whole multiple of the frame size */
 gboolean gst_audio_is_buffer_framed     (GstPad* pad, GstBuffer* buf);
 
+/* functions useful for _getcaps functions */
+typedef enum {
+  GST_AUDIO_FIELD_RATE          = (1 << 0),
+  GST_AUDIO_FIELD_CHANNELS      = (1 << 1),
+  GST_AUDIO_FIELD_ENDIANNESS    = (1 << 2),
+  GST_AUDIO_FIELD_WIDTH         = (1 << 3),
+  GST_AUDIO_FIELD_DEPTH         = (1 << 4),
+  GST_AUDIO_FIELD_SIGNED        = (1 << 5),
+  GST_AUDIO_FIELD_BUFFER_FRAMES = (1 << 6)
+} GstAudioFieldFlag;
+
+void gst_audio_structure_set_int (GstStructure *structure, GstAudioFieldFlag flag);
+
 G_END_DECLS