1 files changed, 122 insertions, 0 deletions
diff --git a/ext/vorbis/gstvorbisdeclib.c b/ext/vorbis/gstvorbisdeclib.c
new file mode 100644
index 00000000..9f3331c3
--- /dev/null
+++ b/ext/vorbis/gstvorbisdeclib.c
@@ -0,0 +1,122 @@
+/* GStreamer
+ * Copyright (C) 2010 Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>
+ * Copyright (C) 2010 Nokia Corporation. All rights reserved.
+ *   Contact: Stefan Kost <stefan.kost@nokia.com>
+ *
+ * Tremor modifications <2006>:
+ *   Chris Lord, OpenedHand Ltd. <chris@openedhand.com>, http://www.o-hand.com/
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstvorbisdeclib.h"
+
+#ifndef TREMOR
+/* These samples can be outside of the float -1.0 -- 1.0 range, this
+ * is allowed, downstream elements are supposed to clip */
+void
+copy_samples (vorbis_sample_t * out, vorbis_sample_t ** in, guint samples,
+    gint channels, gint width)
+{
+  gint i, j;
+
+  g_assert (width == 4);
+
+#ifdef GST_VORBIS_DEC_SEQUENTIAL
+  for (i = 0; i < channels; i++) {
+    memcpy (out, in[i], samples * sizeof (float));
+    out += samples;
+  }
+#else
+  for (j = 0; j < samples; j++) {
+    for (i = 0; i < channels; i++) {
+      *out++ = in[i][j];
+    }
+  }
+#endif
+}
+
+#else
+
+/* Taken from Tremor, misc.h */
+#ifdef _ARM_ASSEM_
+static inline ogg_int32_t
+CLIP_TO_15 (ogg_int32_t x)
+{
+  int tmp;
+  asm volatile ("subs	%1, %0, #32768\n\t"
+      "movpl	%0, #0x7f00\n\t"
+      "orrpl	%0, %0, #0xff\n"
+      "adds	%1, %0, #32768\n\t"
+      "movmi	%0, #0x8000":"+r" (x), "=r" (tmp)
+      ::"cc");
+
+  return (x);
+}
+#else
+static inline ogg_int32_t
+CLIP_TO_15 (ogg_int32_t x)
+{
+  int ret = x;
+
+  ret -= ((x <= 32767) - 1) & (x - 32767);
+  ret -= ((x >= -32768) - 1) & (x + 32768);
+  return (ret);
+}
+#endif
+
+static void
+copy_samples_32 (gint32 * out, ogg_int32_t ** in, guint samples, gint channels)
+{
+  gint i, j;
+
+  for (j = 0; j < samples; j++) {
+    for (i = 0; i < channels; i++) {
+      *out++ = CLIP_TO_15 (in[i][j] >> 9);
+    }
+  }
+}
+
+static void
+copy_samples_16 (gint16 * out, ogg_int32_t ** in, guint samples, gint channels)
+{
+  gint i, j;
+
+  for (j = 0; j < samples; j++) {
+    for (i = 0; i < channels; i++) {
+      *out++ = CLIP_TO_15 (in[i][j] >> 9);
+    }
+  }
+}
+
+void
+copy_samples (vorbis_sample_t * out, vorbis_sample_t ** in, guint samples,
+    gint channels, gint width)
+{
+  if (width == 4) {
+    copy_samples_32 ((gint32 *) out, in, samples, channels);
+  } else if (width == 2) {
+    copy_samples_16 ((gint16 *) out, in, samples, channels);
+  } else {
+    g_assert_not_reached ();
+  }
+}
+
+#endif