diff options
Diffstat (limited to 'apps/metadata/mpc.c')
-rw-r--r-- | apps/metadata/mpc.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/apps/metadata/mpc.c b/apps/metadata/mpc.c new file mode 100644 index 0000000000..60e8202ff5 --- /dev/null +++ b/apps/metadata/mpc.c | |||
@@ -0,0 +1,118 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2005 Dave Chapman | ||
11 | * | ||
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. | ||
14 | * | ||
15 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
16 | * KIND, either express or implied. | ||
17 | * | ||
18 | ****************************************************************************/ | ||
19 | #include <stdio.h> | ||
20 | #include <string.h> | ||
21 | #include <stdlib.h> | ||
22 | #include <ctype.h> | ||
23 | #include <inttypes.h> | ||
24 | |||
25 | #include "system.h" | ||
26 | #include "id3.h" | ||
27 | #include "metadata_common.h" | ||
28 | #include "logf.h" | ||
29 | #include "replaygain.h" | ||
30 | |||
31 | bool get_musepack_metadata(int fd, struct mp3entry *id3) | ||
32 | { | ||
33 | const int32_t sfreqs_sv7[4] = { 44100, 48000, 37800, 32000 }; | ||
34 | uint32_t header[8]; | ||
35 | uint64_t samples = 0; | ||
36 | int i; | ||
37 | |||
38 | if (!skip_id3v2(fd, id3)) | ||
39 | return false; | ||
40 | if (read(fd, header, 4*8) != 4*8) return false; | ||
41 | /* Musepack files are little endian, might need swapping */ | ||
42 | for (i = 1; i < 8; i++) | ||
43 | header[i] = letoh32(header[i]); | ||
44 | if (!memcmp(header, "MP+", 3)) { /* Compare to sig "MP+" */ | ||
45 | unsigned int streamversion; | ||
46 | |||
47 | header[0] = letoh32(header[0]); | ||
48 | streamversion = (header[0] >> 24) & 15; | ||
49 | if (streamversion >= 8) { | ||
50 | return false; /* SV8 or higher don't exist yet, so no support */ | ||
51 | } else if (streamversion == 7) { | ||
52 | unsigned int gapless = (header[5] >> 31) & 0x0001; | ||
53 | unsigned int last_frame_samples = (header[5] >> 20) & 0x07ff; | ||
54 | int track_gain, album_gain; | ||
55 | unsigned int bufused; | ||
56 | |||
57 | id3->frequency = sfreqs_sv7[(header[2] >> 16) & 0x0003]; | ||
58 | samples = (uint64_t)header[1]*1152; /* 1152 is mpc frame size */ | ||
59 | if (gapless) | ||
60 | samples -= 1152 - last_frame_samples; | ||
61 | else | ||
62 | samples -= 481; /* Musepack subband synth filter delay */ | ||
63 | |||
64 | /* Extract ReplayGain data from header */ | ||
65 | track_gain = (int16_t)((header[3] >> 16) & 0xffff); | ||
66 | id3->track_gain = get_replaygain_int(track_gain); | ||
67 | id3->track_peak = ((uint16_t)(header[3] & 0xffff)) << 9; | ||
68 | |||
69 | album_gain = (int16_t)((header[4] >> 16) & 0xffff); | ||
70 | id3->album_gain = get_replaygain_int(album_gain); | ||
71 | id3->album_peak = ((uint16_t)(header[4] & 0xffff)) << 9; | ||
72 | |||
73 | /* Write replaygain values to strings for use in id3 screen. We use | ||
74 | the XING header as buffer space since Musepack files shouldn't | ||
75 | need to use it in any other way */ | ||
76 | id3->track_gain_string = (char *)id3->toc; | ||
77 | bufused = snprintf(id3->track_gain_string, 45, | ||
78 | "%d.%d dB", track_gain/100, abs(track_gain)%100); | ||
79 | id3->album_gain_string = (char *)id3->toc + bufused + 1; | ||
80 | bufused = snprintf(id3->album_gain_string, 45, | ||
81 | "%d.%d dB", album_gain/100, abs(album_gain)%100); | ||
82 | } | ||
83 | } else { | ||
84 | header[0] = letoh32(header[0]); | ||
85 | unsigned int streamversion = (header[0] >> 11) & 0x03FF; | ||
86 | if (streamversion != 4 && streamversion != 5 && streamversion != 6) | ||
87 | return false; | ||
88 | id3->frequency = 44100; | ||
89 | id3->track_gain = 0; | ||
90 | id3->track_peak = 0; | ||
91 | id3->album_gain = 0; | ||
92 | id3->album_peak = 0; | ||
93 | |||
94 | if (streamversion >= 5) | ||
95 | samples = (uint64_t)header[1]*1152; // 32 bit | ||
96 | else | ||
97 | samples = (uint64_t)(header[1] >> 16)*1152; // 16 bit | ||
98 | |||
99 | samples -= 576; | ||
100 | if (streamversion < 6) | ||
101 | samples -= 1152; | ||
102 | } | ||
103 | |||
104 | id3->vbr = true; | ||
105 | /* Estimate bitrate, we should probably subtract the various header sizes | ||
106 | here for super-accurate results */ | ||
107 | id3->length = ((int64_t) samples * 1000) / id3->frequency; | ||
108 | |||
109 | if (id3->length <= 0) | ||
110 | { | ||
111 | logf("mpc length invalid!"); | ||
112 | return false; | ||
113 | } | ||
114 | |||
115 | id3->filesize = filesize(fd); | ||
116 | id3->bitrate = id3->filesize * 8 / id3->length; | ||
117 | return true; | ||
118 | } | ||