1 files changed, 128 insertions, 0 deletions
diff --git a/apps/metadata/wave.c b/apps/metadata/wave.c
new file mode 100644
index 0000000..d29f9f5
--- /dev/null
+++ b/apps/metadata/wave.c
@@ -0,0 +1,128 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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 <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <inttypes.h>
+
+#include "system.h"
+#include "id3.h"
+#include "metadata_common.h"
+
+bool get_wave_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 i;
+
+    /* get RIFF chunk header */
+    if ((lseek(fd, 0, SEEK_SET) < 0)
+        || ((read_bytes = read(fd, buf, 12)) < 12))
+    {
+        return false;
+    }
+
+    if ((memcmp(buf, "RIFF",4) != 0)
+        || (memcmp(&buf[8], "WAVE", 4) !=0 ))
+    {
+        return false;
+    }
+
+    /* iterate over WAVE chunks until 'data' chunk */
+    while (true)
+    {
+        /* get chunk header */
+        if ((read_bytes = read(fd, buf, 8)) < 8)
+            return false;
+
+        /* chunkSize */
+        i = get_long_le(&buf[4]);
+
+        if (memcmp(buf, "fmt ", 4) == 0)
+        {
+            /* get rest of chunk */
+            if ((read_bytes = read(fd, buf, 16)) < 16)
+                return false;
+
+            i -= 16;
+
+            /* skipping wFormatTag */
+            /* wChannels */
+            channels = buf[2] | (buf[3] << 8);
+            /* dwSamplesPerSec */
+            id3->frequency = get_long_le(&buf[4]);
+            /* dwAvgBytesPerSec */
+            id3->bitrate = (get_long_le(&buf[8]) * 8) / 1000;
+            /* skipping wBlockAlign */
+            /* wBitsPerSample */
+            bitspersample = buf[14] | (buf[15] << 8);
+        }
+        else if (memcmp(buf, "data", 4) == 0)
+        {
+            numbytes = i;
+            break;
+        }
+        else if (memcmp(buf, "fact", 4) == 0)
+        {
+            /* dwSampleLength */
+            if (i >= 4)
+            {
+                /* get rest of chunk */
+                if ((read_bytes = read(fd, buf, 4)) < 4)
+                    return false;
+
+                i -= 4;
+                totalsamples = get_long_le(buf);
+            }
+        }
+
+        /* seek to next chunk (even chunk sizes must be padded) */
+        if (i & 0x01)
+            i++;
+
+        if(lseek(fd, i, SEEK_CUR) < 0)
+            return false;
+    }
+
+    if ((numbytes == 0) || (channels == 0))
+    {
+        return false;
+    }
+
+    if (totalsamples == 0)
+    {
+        /* for PCM only */
+        totalsamples = numbytes
+            / ((((bitspersample - 1) / 8) + 1) * channels);
+    }
+
+    id3->vbr = false;   /* All WAV files are CBR */
+    id3->filesize = filesize(fd);
+
+    /* Calculate track length (in ms) and estimate the bitrate (in kbit/s) */
+    id3->length = ((int64_t) totalsamples * 1000) / id3->frequency;
+
+    return true;
+}