First audio codec playback attempt by Miikka Pekkarinen

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6574 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/codecvorbis.c

@@ -0,0 +1,160 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 Björn Stenberg
+ *
+ * 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 "kernel.h"
+#include "plugin.h"
+
+#include <codecs/Tremor/ivorbisfile.h>
+
+#include "playback.h"
+#include "lib/codeclib.h"
+
+static struct plugin_api* rb;
+
+/* Some standard functions and variables needed by Tremor */
+
+
+int errno;
+
+size_t strlen(const char *s) {
+  return(rb->strlen(s));
+}
+
+char *strcpy(char *dest, const char *src) {
+  return(rb->strcpy(dest,src));
+}
+
+char *strcat(char *dest, const char *src) {
+  return(rb->strcat(dest,src));
+}
+
+size_t read_handler(void *ptr, size_t size, size_t nmemb, void *datasource) {
+    struct codec_api *p = (struct codec_api *) datasource;
+
+    return p->read_filebuf(ptr, nmemb*size);
+}
+
+int seek_handler(void *datasource, ogg_int64_t offset, int whence) {
+  /* We are not seekable at the moment */
+  (void)datasource;
+  (void)offset;
+  (void)whence;
+  return -1;
+}
+
+int close_handler(void *datasource) {
+  (void)datasource;
+  return 0;
+}
+
+long tell_handler(void *datasource) {
+    struct codec_api *p = (struct codec_api *) datasource;
+  return p->curpos;
+}
+
+#ifdef USE_IRAM
+extern char iramcopy[];
+extern char iramstart[];
+extern char iramend[];
+#endif
+
+
+/* reserve the PCM buffer in the IRAM area */
+static char pcmbuf[4096] IDATA_ATTR;
+
+/* this is the plugin entry point */
+enum plugin_status plugin_start(struct plugin_api* api, void* parm)
+{
+  struct codec_api *ci = (struct codec_api *)parm;
+  ov_callbacks callbacks;
+  OggVorbis_File vf;
+  vorbis_info* vi;
+
+  int error;
+  long n;
+  int current_section;
+  int eof;
+#if BYTE_ORDER == BIG_ENDIAN
+  int i;
+  char x;
+#endif
+
+  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;
+
+  #ifdef USE_IRAM
+  rb->memcpy(iramstart, iramcopy, iramend-iramstart);
+  #endif
+    
+  /* This function sets up the buffers and reads the file into RAM */
+    
+  if (codec_init(api, ci)) {
+    return PLUGIN_ERROR;
+  }
+
+
+  /* Create a decoder instance */
+
+  callbacks.read_func=read_handler;
+  callbacks.seek_func=seek_handler;
+  callbacks.tell_func=tell_handler;
+  callbacks.close_func=close_handler;
+
+  next_track:
+  error=ov_open_callbacks(ci,&vf,NULL,0,callbacks);
+    
+  vi=ov_info(&vf,-1);
+
+  if (vi==NULL) {
+    // rb->splash(HZ*2, true, "Vorbis Error");
+    return PLUGIN_ERROR;
+  }
+  
+  eof=0;
+  while (!eof) {
+    /* Read host-endian signed 16 bit PCM samples */
+    n=ov_read(&vf,pcmbuf,sizeof(pcmbuf),&current_section);
+
+    if (n==0) {
+      eof=1;
+    } else if (n < 0) {
+      DEBUGF("Error decoding frame\n");
+    } else {
+      rb->yield();
+      if (ci->stop_codec || ci->reload_codec)
+        break ;
+      while (!ci->audiobuffer_insert(pcmbuf, n))
+        rb->yield();
+	    
+#if BYTE_ORDER == BIG_ENDIAN
+      for (i=0;i<n;i+=2) { 
+        x=pcmbuf[i]; pcmbuf[i]=pcmbuf[i+1]; pcmbuf[i+1]=x;
+      }
+#endif
+    }
+  }
+  
+  if (ci->request_next_track())
+    goto next_track;
+    
+  return PLUGIN_OK;
+}
+