Initial DSP implementation. DSP supports resampling audio stream from

codecs (currently works corrently only with mp3's, somebody should fix
that).


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6877 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 48 insertions, 0 deletions

diff --git a/apps/dsp.h b/apps/dsp.h
new file mode 100644
index 0000000000..65cd837c1e
--- /dev/null
+++ b/apps/dsp.h
@@ -0,0 +1,48 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2005 Miika Pekkarinen
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef _DSP_H
+#define _DSP_H
+
+#include <stdlib.h>
+#include <ctype.h>
+#include <stdbool.h>
+
+#define NATIVE_FREQUENCY       44100
+#define STEREO_INTERLEAVED     0
+#define STEREO_NONINTERLEAVED  1
+/* Not supported yet. */
+#define STEREO_MONO            2
+
+struct dsp_configuration {
+    long frequency;
+    long clip_min, clip_max;
+    int sample_depth;
+    bool dither_enabled;
+    int stereo_mode;
+};
+
+extern struct dsp_configuration dsp_config;
+
+int dsp_process(char *dest, char *src, int samplecount);
+bool dsp_configure(int setting, void *value);
+
+#endif
+
+