audio library

Original commit message from CVS:
audio library

1 files changed, 109 insertions, 0 deletions

diff --git a/gst-libs/audio/gstaudio.h b/gst-libs/audio/gstaudio.h
new file mode 100644
index 00000000..09ef3ec7
--- /dev/null
+++ b/gst-libs/audio/gstaudio.h
@@ -0,0 +1,109 @@
+/* Gnome-Streamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Library       <2001> Thomas Vander Stichele <thomas@apestaart.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <gst/gst.h>
+
+/* for people that are looking at this source: the purpose of these defines is
+ * to make GstCaps a bit easier, in that you don't have to know all of the
+ * properties that need to be defined. you can just use these macros. currently
+ * (8/01) the only plugins that use these are the passthrough, speed, volume,
+ * and [de]interleave plugins. so. these are for convenience only, and do not
+ * specify the 'limits' of gstreamer. you might also use these definitions as a
+ * base for making your own caps, if need be.
+ *
+ * for example, to make a source pad that can output mono streams of either
+ * float or int:
+
+    template = gst_padtemplate_new 
+      ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
+      gst_caps_append(gst_caps_new ("sink_int",  "audio/raw",
+                                    GST_AUDIO_INT_PAD_TEMPLATE_PROPS),
+                      gst_caps_new ("sink_float", "audio/raw",
+                                    GST_AUDIO_FLOAT_MONO_PAD_TEMPLATE_PROPS)),
+      NULL);
+
+    srcpad = gst_pad_new_from_template(template,"src");
+
+ * Andy Wingo, 18 August 2001 */
+
+#define GST_AUDIO_INT_PAD_TEMPLATE_PROPS \
+        gst_props_new (\
+          "format",             GST_PROPS_STRING ("int"),\
+            "law",              GST_PROPS_INT (0),\
+            "endianness",       GST_PROPS_INT (G_BYTE_ORDER),\
+            "signed",           GST_PROPS_LIST (\
+            					  GST_PROPS_BOOLEAN (TRUE),\
+            					  GST_PROPS_BOOLEAN(FALSE)\
+            					),\
+            "width",            GST_PROPS_LIST (GST_PROPS_INT(8), GST_PROPS_INT(16)),\
+            "depth",            GST_PROPS_LIST (GST_PROPS_INT(8), GST_PROPS_INT(16)),\
+            "rate",             GST_PROPS_INT_RANGE (4000, 96000),\
+            "channels",         GST_PROPS_INT_RANGE (1, G_MAXINT),\
+          NULL)
+
+#define GST_AUDIO_INT_MONO_PAD_TEMPLATE_PROPS \
+        gst_props_new (\
+          "format",             GST_PROPS_STRING ("int"),\
+            "law",              GST_PROPS_INT (0),\
+            "endianness",       GST_PROPS_INT (G_BYTE_ORDER),\
+            "signed",           GST_PROPS_LIST (\
+            					  GST_PROPS_BOOLEAN (TRUE),\
+            					  GST_PROPS_BOOLEAN(FALSE)\
+            					),\
+            "width",            GST_PROPS_LIST (GST_PROPS_INT(8), GST_PROPS_INT(16)),\
+            "depth",            GST_PROPS_LIST (GST_PROPS_INT(8), GST_PROPS_INT(16)),\
+            "rate",             GST_PROPS_INT_RANGE (4000, 96000),\
+            "channels",         GST_PROPS_INT (1),\
+          NULL)
+
+#define GST_AUDIO_FLOAT_MONO_PAD_TEMPLATE_PROPS \
+        gst_props_new (\
+          "format",             GST_PROPS_STRING ("float"),\
+            "layout",           GST_PROPS_STRING ("gfloat"),\
+            "intercept",        GST_PROPS_FLOAT (0.0),\
+            "slope",            GST_PROPS_FLOAT (1.0),\
+            "rate",             GST_PROPS_INT_RANGE (4000, 96000),\
+            "channels",         GST_PROPS_INT (1),\
+            NULL)
+
+/*
+ * this library defines and implements some helper functions for audio
+ * handling
+ */
+
+/* get byte size of audio frame (based on caps of pad */
+int		gst_audio_frame_byte_size 	(GstPad* pad);
+
+/* get length in frames of buffer */
+long		gst_audio_frame_length 		(GstPad* pad, GstBuffer* buf);
+
+/* get frame rate based on caps */
+long		gst_audio_frame_rate		(GstPad *pad);
+
+/* calculate length in seconds of audio buffer buf based on caps of pad */
+double 		gst_audio_length 		(GstPad* pad, GstBuffer* buf);
+
+/* calculate highest possible sample value based on capabilities of pad */
+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);
+
+