From 7dad7d3a6a7b9c2a972d0426488eed503f39cf72 Mon Sep 17 00:00:00 2001
From: Dave Bryant <bryant@rockbox.org>
Date: Mon, 13 Jun 2005 06:15:05 +0000
Subject: Initial commit of actual WavPack codec...   :)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6699 a1c6a512-1295-4272-9138-f99709370657
---
 apps/plugins/codecwavpack.c | 185 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 185 insertions(+)
 create mode 100644 apps/plugins/codecwavpack.c

(limited to 'apps')

diff --git a/apps/plugins/codecwavpack.c b/apps/plugins/codecwavpack.c
new file mode 100644
index 0000000000..1e56dbd88e
--- /dev/null
+++ b/apps/plugins/codecwavpack.c
@@ -0,0 +1,185 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2005 David Bryant
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#include "plugin.h"
+
+#include <codecs/libwavpack/wavpack.h>
+#include "playback.h"
+#include "lib/codeclib.h"
+
+static struct plugin_api *rb;
+static struct codec_api *ci;
+
+#define BUFFER_SIZE 4096
+
+static long temp_buffer [BUFFER_SIZE] IDATA_ATTR;
+
+static long read_callback (void *buffer, long bytes)
+{
+    return ci->read_filebuf (buffer, bytes);
+}
+
+#ifndef SIMULATOR
+extern char iramcopy[];
+extern char iramstart[];
+extern char iramend[];
+#endif
+
+/* this is the plugin entry point */
+enum plugin_status plugin_start(struct plugin_api* api, void* parm)
+{
+    WavpackContext *wpc;
+    char error [80];
+    int bps, nchans;
+
+    /* Generic plugin initialisation */
+    TEST_PLUGIN_API(api);
+
+    rb = api;
+    ci = (struct codec_api*) parm;
+
+#ifndef SIMULATOR
+    rb->memcpy(iramstart, iramcopy, iramend-iramstart);
+#endif
+
+    ci->configure(CODEC_SET_FILEBUF_LIMIT, (int *)(1024*1024*10));
+    ci->configure(CODEC_SET_FILEBUF_WATERMARK, (int *)(1024*512));
+    ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*128));
+
+    next_track:
+
+    if (codec_init(api, ci))
+        return PLUGIN_ERROR;
+
+    /* Create a decoder instance */
+
+    wpc = WavpackOpenFileInput (read_callback, error);
+
+    if (!wpc)
+        return PLUGIN_ERROR;
+
+    bps = WavpackGetBytesPerSample (wpc);
+    nchans = WavpackGetReducedChannels (wpc);
+
+    ci->set_elapsed (0);
+
+    /* The main decoder loop */
+
+    while (1) {
+        long nsamples;  
+
+        if (ci->seek_time && ci->taginfo_ready && ci->id3->length) {
+            int curpos_ms = (WavpackGetSampleIndex (wpc) + 220) / 441 * 10;
+            int n, d, skip;
+
+            if (ci->seek_time > curpos_ms) {
+                n = ci->seek_time - curpos_ms;
+                d = ci->id3->length - curpos_ms;
+                skip = (int)((long long)(ci->filesize - ci->curpos) * n / d);
+                ci->seek_buffer (ci->curpos + skip);
+            }
+            else {
+                n = curpos_ms - ci->seek_time;
+                d = curpos_ms;
+                skip = (int)((long long) ci->curpos * n / d);
+                ci->seek_buffer (ci->curpos - skip);
+            }
+
+            wpc = WavpackOpenFileInput (read_callback, error);
+            ci->seek_time = 0;
+
+            if (!wpc)
+                break;
+
+            ci->set_elapsed ((int)((long long) WavpackGetSampleIndex (wpc) * 1000 / 44100));
+            rb->yield ();
+        }
+
+        nsamples = WavpackUnpackSamples (wpc, temp_buffer, BUFFER_SIZE / 2);  
+
+        if (!nsamples || ci->stop_codec || ci->reload_codec)
+            break;
+
+        /* convert mono to stereo here, in place */
+
+        if (nchans == 1) {
+            long *dst = temp_buffer + (nsamples * 2);
+            long *src = temp_buffer + nsamples;
+            long count = nsamples;
+
+            while (count--) {
+                *--dst = *--src;
+                *--dst = *src;
+                if (!(count & 0x7f))
+                    rb->yield ();
+            }
+        }
+
+        if (bps == 1) {
+            short *dst = (short *) temp_buffer;
+            long *src = temp_buffer;
+            long count = nsamples;
+
+            while (count--) {
+                *dst++ = *src++ << 8;
+                *dst++ = *src++ << 8;
+                if (!(count & 0x7f))
+                    rb->yield ();
+            }
+        }
+        else if (bps == 2) {
+            short *dst = (short *) temp_buffer;
+            long *src = temp_buffer;
+            long count = nsamples;
+
+            while (count--) {
+                *dst++ = *src++;
+                *dst++ = *src++;
+                if (!(count & 0x7f))
+                    rb->yield ();
+            }
+        }
+        else {
+            short *dst = (short *) temp_buffer;
+            int shift = (bps - 2) * 8;
+            long *src = temp_buffer;
+            long count = nsamples;
+
+            while (count--) {
+                *dst++ = *src++ >> shift;
+                *dst++ = *src++ >> shift;
+                if (!(count & 0x7f))
+                    rb->yield ();
+            }
+        }
+
+        if (ci->stop_codec || ci->reload_codec)
+            break;
+
+        while (!ci->audiobuffer_insert ((char *) temp_buffer, nsamples * 4))
+            rb->yield ();
+
+        ci->set_elapsed ((WavpackGetSampleIndex (wpc) + 220) / 441 * 10);
+    }
+
+    if (ci->request_next_track())
+        goto next_track;
+
+    return PLUGIN_OK;
+}
-- 
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