Add codecs to librbcodec.

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/asap.c

@@ -0,0 +1,140 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2008 Dominik Wenger
+ *
+ * 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 "libasap/asap.h"
+
+CODEC_HEADER
+
+#define CHUNK_SIZE (1024*2)
+
+static byte samples[CHUNK_SIZE] IBSS_ATTR;   /* The sample buffer */
+static ASAP_State asap IBSS_ATTR;         /* asap codec state */
+
+/* this is the codec entry point */
+enum codec_status codec_main(enum codec_entry_call_reason reason)
+{
+    /* Nothing to do */
+    return CODEC_OK;
+    (void)reason;
+}
+
+/* this is called for each file to process */
+enum codec_status codec_run(void)
+{
+    int n_bytes;
+    int song;
+    int duration;
+    char* module;
+    int bytesPerSample =2;
+    intptr_t param;
+    
+    if (codec_init()) {
+        DEBUGF("codec init failed\n");
+        return CODEC_ERROR;
+    }
+
+    codec_set_replaygain(ci->id3);
+        
+    int bytes_done =0;   
+    size_t filesize;
+    ci->seek_buffer(0);
+    module = ci->request_buffer(&filesize, ci->filesize);
+    if (!module || (size_t)filesize < (size_t)ci->filesize) 
+    {
+        DEBUGF("loading error\n");
+        return CODEC_ERROR;
+    }
+
+    /*Init ASAP */
+    if (!ASAP_Load(&asap, ci->id3->path, module, filesize))
+    {
+        DEBUGF("%s: format not supported",ci->id3->path);
+        return CODEC_ERROR;
+    }  
+    
+      /* Make use of 44.1khz */
+    ci->configure(DSP_SET_FREQUENCY, 44100);
+    /* Sample depth is 16 bit little endian */
+    ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
+    /* Stereo or Mono output ? */
+    if(asap.module_info->channels ==1)
+    {
+        ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
+        bytesPerSample = 2;
+    }
+    else
+    {
+        ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
+        bytesPerSample = 4; 
+    }    
+    /* reset eleapsed */
+    ci->set_elapsed(0);
+
+    song = asap.module_info->default_song;
+    duration = asap.module_info->durations[song];
+    if (duration < 0)
+        duration = 180 * 1000;
+    
+    /* set id3 length, because metadata parse might not have done it */
+    ci->id3->length = duration;
+    
+    ASAP_PlaySong(&asap, song, duration);
+    ASAP_MutePokeyChannels(&asap, 0);
+    
+    /* The main decoder loop */    
+    while (1) {
+        enum codec_command_action action = ci->get_command(&param);
+
+        if (action == CODEC_ACTION_HALT)
+            break;
+
+        if (action == CODEC_ACTION_SEEK_TIME) {
+            /* New time is ready in param */
+
+            /* seek to pos */
+            ASAP_Seek(&asap,param);
+            /* update bytes_done */
+            bytes_done = param*44.1*2;    
+            /* update elapsed */
+            ci->set_elapsed((bytes_done / 2) / 44.1);
+            /* seek ready */    
+            ci->seek_complete();            
+        }
+        
+        /* Generate a buffer full of Audio */
+        #ifdef ROCKBOX_LITTLE_ENDIAN
+        n_bytes = ASAP_Generate(&asap, samples, sizeof(samples), ASAP_FORMAT_S16_LE);
+        #else
+        n_bytes = ASAP_Generate(&asap, samples, sizeof(samples), ASAP_FORMAT_S16_BE);
+        #endif
+        
+        ci->pcmbuf_insert(samples, NULL, n_bytes /bytesPerSample);
+        
+        bytes_done += n_bytes;
+        ci->set_elapsed((bytes_done / 2) / 44.1);
+        
+        if(n_bytes != sizeof(samples))
+            break;
+    }
+ 
+    return CODEC_OK;    
+}