rbcodec: abstract tdspeed buffer allocation

Move code dealing with rockbox specific buflib allocations into a
rockbox specific file and implement buffer allocation with
malloc/free for warble/stand alone lib.
Based on patch by Sean Bartell.

Change-Id: I8cb85dad5890fbd34c1bb26abbb89c0b0f6b55cf
Reviewed-on: http://gerrit.rockbox.org/144
Tested-by: Nils Wallménius <nils@rockbox.org>
Reviewed-by: Michael Sevakis <jethead71@rockbox.org>
Reviewed-by: Nils Wallménius <nils@rockbox.org>

3 files changed, 107 insertions, 0 deletions

diff --git a/apps/SOURCES b/apps/SOURCES
index 45eb0768a3..e20f1c961b 100644
--- a/apps/SOURCES
+++ b/apps/SOURCES
@@ -26,6 +26,7 @@ menus/audiohw_eq_menu.c
 menus/eq_menu.c
 buffering.c
 voice_thread.c
+rbcodec_helpers.c
 #else  /* !SWCODEC */
 mpeg.c
 #endif
diff --git a/apps/rbcodec_helpers.c b/apps/rbcodec_helpers.c
new file mode 100644
index 0000000000..a7c592c62c
--- /dev/null
+++ b/apps/rbcodec_helpers.c
@@ -0,0 +1,102 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Nicolas Pitre <nico@cam.org>
+ * Copyright (C) 2006-2007 by Stéphane Doyon <s.doyon@videotron.ca>
+ * Copyright (C) 2012 Michael Sevakis
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "platform.h"
+#include "dsp_core.h"
+#include "core_alloc.h"
+#include "tdspeed.h"
+
+static int handles[4] = { 0, 0, 0, 0 };
+
+static int move_callback(int handle, void *current, void *new)
+{
+#if 0
+    /* Should not currently need to block this since DSP loop completes an
+       iteration before yielding and begins again at its input buffer */
+    if (dsp_is_busy(tdspeed_state.dsp))
+        return BUFLIB_CB_CANNOT_MOVE; /* DSP processing in progress */
+#endif
+
+    for (unsigned int i = 0; i < ARRAYLEN(handles); i++)
+    {
+        if (handle != handles[i])
+            continue;
+
+        tdspeed_move(i, current, new);
+        break;
+    }
+
+    return BUFLIB_CB_OK;
+}
+
+static struct buflib_callbacks ops =
+{
+    .move_callback = move_callback,
+    .shrink_callback = NULL,
+};
+
+/* Allocate timestretch buffers */
+bool tdspeed_alloc_buffers(int32_t **buffers, const int *buf_s, int nbuf)
+{
+    static const char *buffer_names[4] = {
+        "tdspeed ovl L",
+        "tdspeed ovl R",
+        "tdspeed out L",
+        "tdspeed out R"
+    };
+
+    for (int i = 0; i < nbuf; i++)
+    {
+        if (handles[i] <= 0)
+        {
+            handles[i] = core_alloc_ex(buffer_names[i], buf_s[i], &ops);
+
+            if (handles[i] <= 0)
+                return false;
+        }
+
+        if (buffers[i] == NULL)
+        {
+            buffers[i] = core_get_data(handles[i]);
+
+            if (buffers[i] == NULL)
+                return false;
+        }
+    }
+
+    return true;
+}
+
+/* Free timestretch buffers */
+void tdspeed_free_buffers(int32_t **buffers, int nbuf)
+{
+    for (int i = 0; i < nbuf; i++)
+    {
+        if (handles[i] > 0)
+            core_free(handles[i]);
+
+        handles[i] = 0;
+        buffers[i] = NULL;
+    }
+}
+
diff --git a/apps/rbcodecplatform.h b/apps/rbcodecplatform.h
index 1dc72ac4e0..d644b7c47a 100644
--- a/apps/rbcodecplatform.h
+++ b/apps/rbcodecplatform.h
@@ -31,5 +31,9 @@
 #include "dsp-util.h"
 #define HAVE_CLIP_SAMPLE_16
 #endif
+
+bool tdspeed_alloc_buffers(int32_t **buffers, const int *buf_s, int nbuf);
+void tdspeed_free_buffers(int32_t **buffers, int nbuf);
+
 #endif