add global proxy / cache settings to httpget class. This removes the need of passing...
[Rockbox.git] / apps / metadata / wavpack.c
blob5d33c0dffd21b71d9b1898e0abcef7159b6d735f
1 /***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id:$
10 * Copyright (C) 2007 David Bryant
12 * All files in this archive are subject to the GNU General Public License.
13 * See the file COPYING in the source tree root for full license agreement.
15 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
16 * KIND, either express or implied.
18 ****************************************************************************/
19 #include <stdio.h>
20 #include <string.h>
21 #include <stdlib.h>
22 #include <ctype.h>
23 #include <inttypes.h>
25 #include "system.h"
26 #include "id3.h"
27 #include "metadata_common.h"
28 #include "logf.h"
30 #define ID_UNIQUE 0x3f
31 #define ID_LARGE 0x80
32 #define ID_SAMPLE_RATE 0x27
34 static const long wavpack_sample_rates [] =
36 6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
37 32000, 44100, 48000, 64000, 88200, 96000, 192000
40 /* A simple parser to read basic information from a WavPack file. This
41 * now works with self-extrating WavPack files and also will scan the
42 * metadata for non-standard sampling rates. This no longer fails on
43 * WavPack files containing floating-point audio data because these are
44 * now converted to standard Rockbox format in the decoder.
47 bool get_wavpack_metadata(int fd, struct mp3entry* id3)
49 /* Use the trackname part of the id3 structure as a temporary buffer */
50 unsigned char* buf = (unsigned char *)id3->path;
51 uint32_t totalsamples, blocksamples;
52 int i;
54 for (i = 0; i < 256; ++i) {
56 /* at every 256 bytes into file, try to read a WavPack header */
58 if ((lseek(fd, i * 256, SEEK_SET) < 0) || (read(fd, buf, 32) < 32))
59 return false;
61 /* if valid WavPack 4 header version, break */
63 if (memcmp (buf, "wvpk", 4) == 0 && buf [9] == 4 &&
64 (buf [8] >= 2 && buf [8] <= 0x10))
65 break;
68 if (i == 256) {
69 logf ("Not a WavPack file");
70 return false;
73 id3->vbr = true; /* All WavPack files are VBR */
74 id3->filesize = filesize (fd);
75 totalsamples = get_long_le(&buf[12]);
76 blocksamples = get_long_le(&buf[20]);
78 if (blocksamples && totalsamples != (uint32_t) -1) {
79 int srindx = ((buf [26] >> 7) & 1) + ((buf [27] << 1) & 14);
81 if (srindx == 15) {
82 uint32_t meta_bytes = buf [4] + (buf [5] << 8) + (buf [6] << 16) - 24;
83 uint32_t meta_size;
85 id3->frequency = 44100;
87 while (meta_bytes >= 6) {
88 if (read(fd, buf, 2) < 2)
89 break;
91 if (buf [0] & ID_LARGE) {
92 if (read(fd, buf + 2, 2) < 2)
93 break;
95 meta_size = (buf [1] << 1) + (buf [2] << 9) + (buf [3] << 17);
96 meta_bytes -= meta_size + 4;
98 else {
99 meta_size = buf [1] << 1;
100 meta_bytes -= meta_size + 2;
102 if ((buf [0] & ID_UNIQUE) == ID_SAMPLE_RATE) {
103 if (meta_size == 4 && read(fd, buf + 2, 4) == 4)
104 id3->frequency = buf [2] + (buf [3] << 8) + (buf [4] << 16);
106 break;
110 if (meta_size > 0 && lseek(fd, meta_size, SEEK_CUR) < 0)
111 break;
114 else
115 id3->frequency = wavpack_sample_rates[srindx];
117 id3->length = ((int64_t) totalsamples * 1000) / id3->frequency;
118 id3->bitrate = filesize (fd) / (id3->length / 8);
121 return true;