Add Sun Audio codec. (FS#10433)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24955 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 123 insertions, 0 deletions

diff --git a/apps/metadata/au.c b/apps/metadata/au.c
new file mode 100644
index 0000000..1a7eef0
--- /dev/null
+++ b/apps/metadata/au.c
@@ -0,0 +1,122 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2010 Yoshihisa Uchida
+ *
+ * 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 <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <inttypes.h>
+
+#include "system.h"
+#include "metadata.h"
+#include "metadata_common.h"
+#include "metadata_parsers.h"
+#include "logf.h"
+
+static int bitspersamples[28] = {
+    0,
+    8,  /* G.711 MULAW */
+    8,  /* 8bit  */
+    16, /* 16bit */
+    24, /* 24bit */
+    32, /* 32bit */
+    32, /* 32bit */
+    64, /* 64bit */
+    0,  /* Fragmented sample data */
+    0,  /* DSP program */
+    0,  /* 8bit fixed point */
+    0,  /* 16bit fixed point */
+    0,  /* 24bit fixed point */
+    0,  /* 32bit fixed point */
+    0,
+    0,
+    0,
+    0,
+    0,  /* 16bit linear with emphasis */
+    0,  /* 16bit linear compressed */
+    0,  /* 16bit linear with emphasis and compression */
+    0,  /* Music kit DSP commands */
+    0,
+    0,  /* G.721 MULAW */
+    0,  /* G.722 */
+    0,  /* G.723 3bit */
+    0,  /* G.723 5bit */
+    8,  /* G.711 ALAW */
+};
+
+static int get_au_bitspersample(unsigned int encoding)
+{
+    if (encoding > 27)
+        return 0;
+    return bitspersamples[encoding];
+}
+
+bool get_au_metadata(int fd, struct mp3entry* id3)
+{
+    /* Use the trackname part of the id3 structure as a temporary buffer */
+    unsigned char* buf = (unsigned char *)id3->path;
+    unsigned long totalsamples = 0;
+    unsigned long channels = 0;
+    unsigned long bitspersample = 0;
+    unsigned long numbytes = 0;
+    int read_bytes;
+    int offset;
+
+    id3->vbr = false;   /* All Sun audio files are CBR */
+    id3->filesize = filesize(fd);
+
+    if ((lseek(fd, 0, SEEK_SET) < 0) || ((read_bytes = read(fd, buf, 24)) < 0))
+        return false;
+
+    if (read_bytes < 24 || (memcmp(buf, ".snd", 4) != 0))
+    {
+        /* no header */
+        numbytes = id3->filesize;
+        bitspersample = 8;
+        id3->frequency = 8000;
+        channels = 1;
+    }
+    else
+    {
+        /* data offset */
+        offset = get_long_be(buf + 4);
+        if (offset < 24)
+        {
+            DEBUGF("CODEC_ERROR: sun audio offset size is small: %d\n", offset);
+            return false;
+        }
+        /* data size */
+        numbytes = get_long_be(buf + 8);
+        if (numbytes == (uint32_t)0xffffffff)
+            numbytes = id3->filesize - offset;
+        /* bitspersample */
+        bitspersample = get_au_bitspersample(get_long_be(buf + 12));
+        /* sample rate */
+        id3->frequency = get_long_be(buf + 16);
+        channels = get_long_be(buf + 20);
+    }
+
+    totalsamples = numbytes / ((((bitspersample - 1) / 8) + 1) * channels);
+
+    /* Calculate track length (in ms) and estimate the bitrate (in kbit/s) */
+    id3->length = ((int64_t) totalsamples * 1000) / id3->frequency;
+
+    return true;
+}
diff --git a/apps/metadata/metadata_parsers.h b/apps/metadata/metadata_parsers.h
index 1e439c8..392f16a 100644
--- a/apps/metadata/metadata_parsers.h
+++ b/apps/metadata/metadata_parsers.h
@@ -43,3 +43,4 @@ bool get_rm_metadata(int fd, struct mp3entry* id3);
 bool get_nsf_metadata(int fd, struct mp3entry* id3);
 bool get_oma_metadata(int fd, struct mp3entry* id3);
 bool get_smaf_metadata(int fd, struct mp3entry* id3);
+bool get_au_metadata(int fd, struct mp3entry* id3);