From e184ef1027ba8f41aca65dbae2af05662b23c722 Mon Sep 17 00:00:00 2001
From: Mohamed Tarek <mt@rockbox.org>
Date: Mon, 6 Jul 2009 22:40:45 +0000
Subject: Adding support for rm playback. Only cook codec is supported for now
 and no seeking.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21695 a1c6a512-1295-4272-9138-f99709370657
---
 apps/codecs/cook.c | 144 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 apps/codecs/cook.c

(limited to 'apps/codecs/cook.c')

diff --git a/apps/codecs/cook.c b/apps/codecs/cook.c
new file mode 100644
index 0000000000..7b4b8e7461
--- /dev/null
+++ b/apps/codecs/cook.c
@@ -0,0 +1,144 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * Copyright (C) 2009 Mohamed Tarek
+ *
+ * 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 <string.h>
+
+#include "logf.h"
+#include "codeclib.h"
+#include "inttypes.h"
+#include "libcook/cook.h"
+
+#define DATA_HEADER_SIZE 18 /* size of DATA chunk header in a rm file */
+
+CODEC_HEADER
+
+RMContext rmctx;
+RMPacket pkt;
+COOKContext q;
+
+static void init_rm(RMContext *rmctx)
+{
+    memcpy(rmctx, ci->id3->id3v2buf, sizeof(RMContext));
+}
+
+/* this is the codec entry point */
+enum codec_status codec_main(void)
+{ 
+    static size_t buff_size;
+    int datasize, res, consumed,i;
+    uint8_t *bit_buffer;
+    int16_t outbuf[2048] __attribute__((aligned(32)));
+    uint16_t fs,sps,h;
+    uint32_t packet_count;
+    int scrambling_unit_size;
+
+next_track:
+    if (codec_init()) {
+        DEBUGF("codec init failed\n");
+        return CODEC_ERROR;
+    }
+    while (!*ci->taginfo_ready && !ci->stop_codec)
+        ci->sleep(1);
+
+    codec_set_replaygain(ci->id3);
+    ci->memset(&rmctx,0,sizeof(RMContext));
+    ci->memset(&pkt,0,sizeof(RMPacket));
+    ci->memset(&q,0,sizeof(COOKContext));
+
+    init_rm(&rmctx);
+ 
+    ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
+    ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
+    ci->configure(DSP_SET_STEREO_MODE, rmctx.nb_channels == 1 ?
+                  STEREO_MONO : STEREO_INTERLEAVED);
+
+    packet_count = rmctx.nb_packets;
+    rmctx.audio_framesize = rmctx.block_align;
+    rmctx.block_align = rmctx.sub_packet_size;
+    fs = rmctx.audio_framesize;
+    sps= rmctx.block_align;
+    h = rmctx.sub_packet_h;
+    scrambling_unit_size = h*fs;
+    
+    res =cook_decode_init(&rmctx, &q);
+    if(res < 0) {
+        DEBUGF("failed to initialize cook decoder\n");
+        return CODEC_ERROR;
+    }
+
+    ci->set_elapsed(0);
+    ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
+
+    /* The main decoder loop */  
+    while (1)
+   {
+        /*if (ci->seek_time) {
+
+            ci->set_elapsed(ci->seek_time);
+            n = ci->seek_time/10;
+            memset(buf,0,BUF_SIZE);              
+            ci->seek_complete();            
+        }*/
+         
+        while(packet_count)
+        {  
+            bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
+            consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
+            if(consumed < 0) {
+                DEBUGF("rm_get_packet failed\n");
+                return CODEC_ERROR;
+            }
+            /*DEBUGF("    version = %d\n"
+                     "    length  = %d\n"
+                     "    stream  = %d\n"
+                     "    timestamp= %d\n",pkt.version,pkt.length,pkt.stream_number,pkt.timestamp);*/
+
+            for(i = 0; i < rmctx.audio_pkt_cnt*(fs/sps) ; i++)
+            { 
+                ci->yield();
+                if (ci->stop_codec || ci->new_track)
+                    goto done;
+
+                res = cook_decode_frame(&rmctx,&q, outbuf, &datasize, pkt.frames[i], rmctx.block_align);
+                rmctx.frame_number++;
+
+                /* skip the first two frames; no valid audio */
+                if(rmctx.frame_number < 3) continue;
+
+                if(res != rmctx.block_align) {
+                    DEBUGF("codec error\n");
+                    return CODEC_ERROR;
+                }
+
+                ci->pcmbuf_insert(outbuf, NULL, rmctx.samples_pf_pc / rmctx.nb_channels);
+                ci->set_elapsed(rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i);       
+            }
+            packet_count -= rmctx.audio_pkt_cnt;
+            rmctx.audio_pkt_cnt = 0;
+            ci->advance_buffer(consumed);
+        }
+        goto done;  
+        
+    }
+    done :
+    if (ci->request_next_track())
+        goto next_track;
+
+    return CODEC_OK;    
+}
-- 
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