Build librbcodec with DSP and metadata.

All associated files are moved to /lib/rbcodec.

Change-Id: I572ddd2b8a996aae1e98c081d06b1ed356dce222

lib/rbcodec/metadata/wavpack.c

@@ -0,0 +1,160 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2007 David Bryant
+ *
+ * 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"
+
+#define ID_UNIQUE               0x3f
+#define ID_LARGE                0x80
+#define ID_SAMPLE_RATE          0x27
+
+#define MONO_FLAG       4
+#define HYBRID_FLAG     8
+
+static const long wavpack_sample_rates [] = 
+{
+     6000,  8000,  9600, 11025, 12000, 16000,  22050, 24000, 
+    32000, 44100, 48000, 64000, 88200, 96000, 192000 
+};
+
+/* A simple parser to read basic information from a WavPack file. This
+ * now works with self-extrating WavPack files and also will scan the
+ * metadata for non-standard sampling rates. This no longer fails on
+ * WavPack files containing floating-point audio data because these are
+ * now converted to standard Rockbox format in the decoder, and also
+ * handles the case where up to 15 non-audio blocks might occur at the
+ * beginning of the file.
+ */
+
+bool get_wavpack_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;
+    uint32_t totalsamples = (uint32_t) -1;
+    int i;
+
+    for (i = 0; i < 256; ++i) {
+
+        /* at every 256 bytes into file, try to read a WavPack header */
+
+        if ((lseek(fd, i * 256, SEEK_SET) < 0) || (read(fd, buf, 32) < 32))
+            return false;
+
+        /* if valid WavPack 4 header version, break */
+
+        if (memcmp (buf, "wvpk", 4) == 0 && buf [9] == 4 &&
+            (buf [8] >= 2 && buf [8] <= 0x10))
+                break;
+    }
+
+    if (i == 256) {
+        logf ("Not a WavPack file");
+        return false;
+    }
+
+    id3->vbr = true;   /* All WavPack files are VBR */
+    id3->filesize = filesize (fd);
+
+    /* check up to 16 headers before we give up finding one with audio */
+
+    for (i = 0; i < 16; ++i) {
+        uint32_t meta_bytes = get_long_le(&buf [4]) - 24;
+        uint32_t trial_totalsamples = get_long_le(&buf[12]);
+        uint32_t blockindex = get_long_le(&buf[16]);
+        uint32_t blocksamples = get_long_le(&buf[20]);
+        uint32_t flags = get_long_le(&buf[24]);
+
+        if (totalsamples == (uint32_t) -1 && blockindex == 0)
+            totalsamples = trial_totalsamples;
+
+        if (blocksamples) {
+            int srindx = ((buf [26] >> 7) & 1) + ((buf [27] << 1) & 14);
+
+            if (srindx == 15) {
+                uint32_t meta_size;
+
+                id3->frequency = 44100;
+
+                while (meta_bytes >= 6) {
+                    if (read(fd, buf, 2) < 2)
+                        break;
+
+                    if (buf [0] & ID_LARGE) {
+                        if (read(fd, buf + 2, 2) < 2)
+                            break;
+
+                        meta_size = (buf [1] << 1) + (buf [2] << 9) + (buf [3] << 17);
+                        meta_bytes -= meta_size + 4;
+                    }
+                    else {
+                        meta_size = buf [1] << 1;
+                        meta_bytes -= meta_size + 2;
+
+                        if ((buf [0] & ID_UNIQUE) == ID_SAMPLE_RATE) {
+                            if (meta_size == 4 && read(fd, buf + 2, 4) == 4)
+                                id3->frequency = buf [2] + (buf [3] << 8) + (buf [4] << 16);
+
+                            break;
+                        }
+                    }
+
+                    if (meta_size > 0 && lseek(fd, meta_size, SEEK_CUR) < 0)
+                        break;
+                }
+            }
+            else
+                id3->frequency = wavpack_sample_rates[srindx];
+
+            /* if the total number of samples is still unknown, make a guess on the high side (for now) */
+
+            if (totalsamples == (uint32_t) -1) {
+                totalsamples = id3->filesize * 3;
+
+                if (!(flags & HYBRID_FLAG))
+                    totalsamples /= 2;
+
+                if (!(flags & MONO_FLAG))
+                    totalsamples /= 2;
+            }
+
+            id3->length = ((int64_t) totalsamples * 1000) / id3->frequency;
+            id3->bitrate = id3->filesize / (id3->length / 8);
+
+            read_ape_tags(fd, id3);
+            return true;
+        }
+        else {   /* block did not contain audio, so seek to the end and see if there's another */
+            if ((meta_bytes > 0 && lseek(fd, meta_bytes, SEEK_CUR) < 0) ||
+                read(fd, buf, 32) < 32 || memcmp (buf, "wvpk", 4) != 0)
+                    break;
+        }
+    }
+
+    return false;
+}