Remove executable property that somehow got set
[kugel-rb.git] / apps / metadata / wavpack.c
bloba5a342bf042e94ba19ad76143cb2bfdd45d18b59
1 /***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id:$
10 * Copyright (C) 2007 David Bryant
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
20 ****************************************************************************/
21 #include <stdio.h>
22 #include <string.h>
23 #include <stdlib.h>
24 #include <ctype.h>
25 #include <inttypes.h>
27 #include "system.h"
28 #include "metadata.h"
29 #include "metadata_common.h"
30 #include "metadata_parsers.h"
31 #include "logf.h"
33 #define ID_UNIQUE 0x3f
34 #define ID_LARGE 0x80
35 #define ID_SAMPLE_RATE 0x27
37 #define MONO_FLAG 4
38 #define HYBRID_FLAG 8
40 static const long wavpack_sample_rates [] =
42 6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
43 32000, 44100, 48000, 64000, 88200, 96000, 192000
46 /* A simple parser to read basic information from a WavPack file. This
47 * now works with self-extrating WavPack files and also will scan the
48 * metadata for non-standard sampling rates. This no longer fails on
49 * WavPack files containing floating-point audio data because these are
50 * now converted to standard Rockbox format in the decoder.
53 bool get_wavpack_metadata(int fd, struct mp3entry* id3)
55 /* Use the trackname part of the id3 structure as a temporary buffer */
56 unsigned char* buf = (unsigned char *)id3->path;
57 uint32_t totalsamples, blocksamples, flags;
58 int i;
60 for (i = 0; i < 256; ++i) {
62 /* at every 256 bytes into file, try to read a WavPack header */
64 if ((lseek(fd, i * 256, SEEK_SET) < 0) || (read(fd, buf, 32) < 32))
65 return false;
67 /* if valid WavPack 4 header version, break */
69 if (memcmp (buf, "wvpk", 4) == 0 && buf [9] == 4 &&
70 (buf [8] >= 2 && buf [8] <= 0x10))
71 break;
74 if (i == 256) {
75 logf ("Not a WavPack file");
76 return false;
79 id3->vbr = true; /* All WavPack files are VBR */
80 id3->filesize = filesize (fd);
81 totalsamples = get_long_le(&buf[12]);
82 blocksamples = get_long_le(&buf[20]);
83 flags = get_long_le(&buf[24]);
85 if (blocksamples) {
86 int srindx = ((buf [26] >> 7) & 1) + ((buf [27] << 1) & 14);
88 if (srindx == 15) {
89 uint32_t meta_bytes = buf [4] + (buf [5] << 8) + (buf [6] << 16) - 24;
90 uint32_t meta_size;
92 id3->frequency = 44100;
94 while (meta_bytes >= 6) {
95 if (read(fd, buf, 2) < 2)
96 break;
98 if (buf [0] & ID_LARGE) {
99 if (read(fd, buf + 2, 2) < 2)
100 break;
102 meta_size = (buf [1] << 1) + (buf [2] << 9) + (buf [3] << 17);
103 meta_bytes -= meta_size + 4;
105 else {
106 meta_size = buf [1] << 1;
107 meta_bytes -= meta_size + 2;
109 if ((buf [0] & ID_UNIQUE) == ID_SAMPLE_RATE) {
110 if (meta_size == 4 && read(fd, buf + 2, 4) == 4)
111 id3->frequency = buf [2] + (buf [3] << 8) + (buf [4] << 16);
113 break;
117 if (meta_size > 0 && lseek(fd, meta_size, SEEK_CUR) < 0)
118 break;
121 else
122 id3->frequency = wavpack_sample_rates[srindx];
124 /* if the total number of samples is unknown, make a guess on the high side (for now) */
126 if (totalsamples == (uint32_t) -1) {
127 totalsamples = filesize (fd) * 3;
129 if (!(flags & HYBRID_FLAG))
130 totalsamples /= 2;
132 if (!(flags & MONO_FLAG))
133 totalsamples /= 2;
136 id3->length = ((int64_t) totalsamples * 1000) / id3->frequency;
137 id3->bitrate = filesize (fd) / (id3->length / 8);
139 return true;
142 return false;