From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001
From: Sean Bartell <wingedtachikoma@gmail.com>
Date: Sat, 25 Jun 2011 21:32:25 -0400
Subject: Add codecs to librbcodec.
MIME-Version: 1.0
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Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
---
 lib/rbcodec/codecs/wavpack.c | 127 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 lib/rbcodec/codecs/wavpack.c

(limited to 'lib/rbcodec/codecs/wavpack.c')

diff --git a/lib/rbcodec/codecs/wavpack.c b/lib/rbcodec/codecs/wavpack.c
new file mode 100644
index 0000000000..4d42391fc1
--- /dev/null
+++ b/lib/rbcodec/codecs/wavpack.c
@@ -0,0 +1,127 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2005 David Bryant
+ *
+ * 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 "codeclib.h"
+#include "libwavpack/wavpack.h"
+
+CODEC_HEADER
+
+#define BUFFER_SIZE 4096
+
+static int32_t temp_buffer [BUFFER_SIZE] IBSS_ATTR;
+
+static int32_t read_callback (void *buffer, int32_t bytes)
+{
+    int32_t retval = ci->read_filebuf (buffer, bytes);
+    ci->set_offset(ci->curpos);
+    return retval;
+}
+
+/* this is the codec entry point */
+enum codec_status codec_main(enum codec_entry_call_reason reason)
+{
+    if (reason == CODEC_LOAD) {
+        /* Generic codec initialisation */
+        ci->configure(DSP_SET_SAMPLE_DEPTH, 28);
+    }
+
+    return CODEC_OK;
+}
+
+/* this is called for each file to process */
+enum codec_status codec_run(void)
+{
+    WavpackContext *wpc;
+    char error [80];
+    /* rockbox: comment 'set but unused' variables
+    int bps;
+    */
+    int nchans, sr_100;
+    intptr_t param;
+
+    if (codec_init())
+        return CODEC_ERROR;
+
+    ci->seek_buffer (ci->id3->offset);
+
+    /* Create a decoder instance */
+    wpc = WavpackOpenFileInput (read_callback, error);
+
+    if (!wpc)
+        return CODEC_ERROR;
+
+    ci->configure(DSP_SWITCH_FREQUENCY, WavpackGetSampleRate (wpc));
+    codec_set_replaygain(ci->id3);
+    /* bps = WavpackGetBytesPerSample (wpc); */
+    nchans = WavpackGetReducedChannels (wpc);
+    ci->configure(DSP_SET_STEREO_MODE, nchans == 2 ? STEREO_INTERLEAVED : STEREO_MONO);
+    sr_100 = ci->id3->frequency / 100;
+
+    ci->set_elapsed (WavpackGetSampleIndex (wpc) / sr_100 * 10);
+
+    /* The main decoder loop */
+
+    while (1) {
+        int32_t nsamples;
+        enum codec_command_action action = ci->get_command(&param);
+
+        if (action == CODEC_ACTION_HALT)
+            break;
+
+        if (action == CODEC_ACTION_SEEK_TIME) {
+            int curpos_ms = WavpackGetSampleIndex (wpc) / sr_100 * 10;
+            int n, d, skip;
+
+            if (param > curpos_ms) {
+                n = param - curpos_ms;
+                d = ci->id3->length - curpos_ms;
+                skip = (int)((int64_t)(ci->filesize - ci->curpos) * n / d);
+                ci->seek_buffer (ci->curpos + skip);
+            }
+            else if (curpos_ms != 0) {
+                n = curpos_ms - param;
+                d = curpos_ms;
+                skip = (int)((int64_t) ci->curpos * n / d);
+                ci->seek_buffer (ci->curpos - skip);
+            }
+
+            wpc = WavpackOpenFileInput (read_callback, error);
+            if (!wpc)
+            {
+                ci->seek_complete();
+                break;
+            }
+
+            ci->set_elapsed (WavpackGetSampleIndex (wpc) / sr_100 * 10);
+            ci->seek_complete();
+        }
+
+        nsamples = WavpackUnpackSamples (wpc, temp_buffer, BUFFER_SIZE / nchans);  
+
+        if (!nsamples)
+            break;
+
+        ci->pcmbuf_insert (temp_buffer, NULL, nsamples);
+        ci->set_elapsed (WavpackGetSampleIndex (wpc) / sr_100 * 10);
+    }
+
+    return CODEC_OK;
+}
-- 
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