Initial revision

Original commit message from CVS:
Initial revision

1 files changed, 182 insertions, 0 deletions

diff --git a/gst/law/alaw-encode.c b/gst/law/alaw-encode.c
new file mode 100644
index 00000000..ab54bd16
--- /dev/null
+++ b/gst/law/alaw-encode.c
@@ -0,0 +1,182 @@
+/* Gnome-Streamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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>
+#include "alaw-encode.h"
+#include "mulaw-conversion.h"
+#include "alaw-conversion.h"
+
+extern GstPadTemplate *alawenc_src_template, *alawenc_sink_template;
+
+
+/* Stereo signals and args */
+enum {
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum {
+  ARG_0
+};
+
+static void		gst_alawenc_class_init		(GstALawEncClass *klass);
+static void		gst_alawenc_init			(GstALawEnc *alawenc);
+
+static void		gst_alawenc_set_property			(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
+static void		gst_alawenc_get_property			(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
+
+static void		gst_alawenc_chain			(GstPad *pad, GstBuffer *buf);
+
+
+static GstElementClass *parent_class = NULL;
+//static guint gst_stereo_signals[LAST_SIGNAL] = { 0 };
+
+static GstPadNegotiateReturn
+alawenc_negotiate_sink (GstPad *pad, GstCaps **caps, gint counter)
+{
+  GstCaps* tempcaps;
+  
+  GstALawEnc* alawenc=GST_ALAWENC (GST_OBJECT_PARENT (pad));
+  
+  if (*caps==NULL) 
+    return GST_PAD_NEGOTIATE_FAIL;
+
+  tempcaps = gst_caps_copy(*caps);
+
+  gst_caps_set(tempcaps,"format",GST_PROPS_STRING("int"));
+  gst_caps_set(tempcaps,"law",GST_PROPS_INT(2));
+  gst_caps_set(tempcaps,"depth",GST_PROPS_INT(8));
+  gst_caps_set(tempcaps,"width",GST_PROPS_INT(8));
+  gst_caps_set(tempcaps,"signed",GST_PROPS_BOOLEAN(FALSE));
+
+  if (gst_pad_set_caps (alawenc->srcpad, tempcaps))
+  {
+    return GST_PAD_NEGOTIATE_AGREE;
+  }
+  else {
+    gst_caps_unref (tempcaps);
+    return GST_PAD_NEGOTIATE_FAIL;
+  }
+}		
+
+GType
+gst_alawenc_get_type(void) {
+  static GType alawenc_type = 0;
+
+  if (!alawenc_type) {
+    static const GTypeInfo alawenc_info = {
+      sizeof(GstALawEncClass),      NULL,
+      NULL,
+      (GClassInitFunc)gst_alawenc_class_init,
+      NULL,
+      NULL,
+      sizeof(GstALawEnc),
+      0,
+      (GInstanceInitFunc)gst_alawenc_init,
+    };
+    alawenc_type = g_type_register_static(GST_TYPE_ELEMENT, "GstALawEnc", &alawenc_info, 0);
+  }
+  return alawenc_type;
+}
+
+static void
+gst_alawenc_class_init (GstALawEncClass *klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass*)klass;
+  gstelement_class = (GstElementClass*)klass;
+
+  parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
+
+  gobject_class->set_property = gst_alawenc_set_property;
+  gobject_class->get_property = gst_alawenc_get_property;
+}
+
+static void
+gst_alawenc_init (GstALawEnc *alawenc)
+{
+  alawenc->sinkpad = gst_pad_new_from_template(alawenc_sink_template,"sink");
+  alawenc->srcpad = gst_pad_new_from_template(alawenc_src_template,"src");
+  gst_pad_set_negotiate_function(alawenc->sinkpad, alawenc_negotiate_sink);
+
+  gst_element_add_pad(GST_ELEMENT(alawenc),alawenc->sinkpad);
+  gst_pad_set_chain_function(alawenc->sinkpad,gst_alawenc_chain);
+  gst_element_add_pad(GST_ELEMENT(alawenc),alawenc->srcpad);
+}
+
+static void
+gst_alawenc_chain (GstPad *pad,GstBuffer *buf)
+{
+  GstALawEnc *alawenc;
+  gint16 *linear_data;
+  guint8 *alaw_data;
+  GstBuffer* outbuf;
+
+  g_return_if_fail(pad != NULL);
+  g_return_if_fail(GST_IS_PAD(pad));
+  g_return_if_fail(buf != NULL);
+
+  alawenc = GST_ALAWENC(GST_OBJECT_PARENT (pad));
+  g_return_if_fail(alawenc != NULL);
+  g_return_if_fail(GST_IS_ALAWENC(alawenc));
+
+  linear_data = (gint16 *)GST_BUFFER_DATA(buf);
+  outbuf=gst_buffer_new();
+  GST_BUFFER_DATA(outbuf) = (gchar*)g_new(gint16,GST_BUFFER_SIZE(buf)/4);
+  GST_BUFFER_SIZE(outbuf) = GST_BUFFER_SIZE(buf)/2;
+
+  alaw_data = (guint8*)GST_BUFFER_DATA(outbuf);
+  mulaw_encode(linear_data,alaw_data,GST_BUFFER_SIZE(outbuf));
+  isdn_audio_ulaw2alaw(alaw_data,GST_BUFFER_SIZE(outbuf));
+  gst_buffer_unref(buf);
+  gst_pad_push(alawenc->srcpad,outbuf);
+}
+
+static void
+gst_alawenc_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+{
+  GstALawEnc *alawenc;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail(GST_IS_ALAWENC(object));
+  alawenc = GST_ALAWENC(object);
+
+  switch (prop_id) {
+    default:
+      break;
+  }
+}
+
+static void
+gst_alawenc_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+  GstALawEnc *alawenc;
+
+  /* it's not null if we got it, but it might not be ours */
+  g_return_if_fail(GST_IS_ALAWENC(object));
+  alawenc = GST_ALAWENC(object);
+
+  switch (prop_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}