From 3c2c2f59f4578c41d591f0e8e88a07103cee499b Mon Sep 17 00:00:00 2001
From: Dave Chapman <dave@dchapman.com>
Date: Fri, 10 Jun 2005 18:08:08 +0000
Subject: Add first version of WAV playback to iRiver - only 16-bit Stereo
 44.1KHz files supported.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6654 a1c6a512-1295-4272-9138-f99709370657
---
 apps/plugins/codecwav.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 apps/plugins/codecwav.c

(limited to 'apps/plugins/codecwav.c')

diff --git a/apps/plugins/codecwav.c b/apps/plugins/codecwav.c
new file mode 100644
index 0000000000..a02f2cdbff
--- /dev/null
+++ b/apps/plugins/codecwav.c
@@ -0,0 +1,131 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2005 Dave Chapman
+ *
+ * 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 "playback.h"
+#include "lib/codeclib.h"
+
+#ifndef SIMULATOR
+extern char iramcopy[];
+extern char iramstart[];
+extern char iramend[];
+#endif
+
+/* This is probably a waste of IRAM, but why not? */
+static unsigned char wavbuf[16384] IDATA_ATTR;
+
+/* this is the plugin entry point */
+enum plugin_status plugin_start(struct plugin_api* api, void* parm)
+{
+  struct plugin_api* rb = (struct plugin_api*)api;
+  struct codec_api* ci = (struct codec_api*)parm;
+  unsigned long samplerate,numbytes,totalsamples,samplesdone,nsamples;
+  int channels,bytespersample,bitspersample;
+  unsigned int i,j,n;
+  int endofstream;
+
+  /* Generic plugin initialisation */
+  TEST_PLUGIN_API(api);
+
+  /* if you are using a global api pointer, don't forget to copy it!
+     otherwise you will get lovely "I04: IllInstr" errors... :-) */
+  rb = api;
+
+#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));
+
+  next_track:
+
+  if (codec_init(api, ci)) {
+    return PLUGIN_ERROR;
+  }
+
+  /* FIX: Correctly parse WAV header - we assume canonical 44-byte header */
+
+  n=(unsigned)(ci->read_filebuf(wavbuf,44));
+  if (n!=44) {
+    return PLUGIN_ERROR;
+  }
+  if ((memcmp(wavbuf,"RIFF",4)!=0) || (memcmp(&wavbuf[8],"WAVEfmt",7)!=0)) {
+    return PLUGIN_ERROR;
+  }
+
+  samplerate=wavbuf[24]|(wavbuf[25]<<8)|(wavbuf[26]<<16)|(wavbuf[27]<<24);
+  bitspersample=wavbuf[34];
+  channels=wavbuf[22];
+  bytespersample=((bitspersample/8)*channels);
+  numbytes=(wavbuf[40]|(wavbuf[41]<<8)|(wavbuf[42]<<16)|(wavbuf[43]<<24));
+  totalsamples=numbytes/bytespersample;
+
+  if ((bitspersample!=16) || (channels != 2)) {
+    return PLUGIN_ERROR;
+  }
+    
+  /* The main decoder loop */
+
+  samplesdone=0;
+  ci->set_elapsed(0);
+  endofstream=0;
+  while (!endofstream) {
+    rb->yield();
+    if (ci->stop_codec || ci->reload_codec) {
+      break;
+    }
+
+    n=(unsigned)(ci->read_filebuf(wavbuf,sizeof(wavbuf)));
+
+    rb->yield();
+
+    if (n==0) break; /* End of stream */
+
+    nsamples=(n/bytespersample);
+
+    /* WAV files can contain extra data at the end - so we can't just
+       process until the end of the file */
+
+    if (samplesdone+nsamples > totalsamples) {
+      nsamples=(totalsamples-samplesdone);
+      n=nsamples*bytespersample;
+      endofstream=1;
+    }
+
+    /* Byte-swap data */
+    for (i=0;i<n;i+=2) {
+        j=wavbuf[i];
+        wavbuf[i]=wavbuf[i+1];
+        wavbuf[i+1]=j;
+    }
+
+    samplesdone+=nsamples;
+    ci->set_elapsed(samplesdone/(ci->id3->frequency/1000));
+   
+    rb->yield();
+    while (!ci->audiobuffer_insert(wavbuf, n))
+      rb->yield();
+  }
+
+  if (ci->request_next_track())
+    goto next_track;
+
+  return PLUGIN_OK;
+}
-- 
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