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author | Sean Bartell <wingedtachikoma@gmail.com> | 2011-06-24 01:25:21 -0400 |
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committer | Nils Wallménius <nils@rockbox.org> | 2012-03-18 12:00:39 +0100 |
commit | b5716df4cb2837bbbc42195cf1aefcf03e21d6a6 (patch) | |
tree | 130cd712e2e00893b6df9959a375a8d9523a1aca /apps/metadata/mp3.c | |
parent | 24bd9d5393dbe39a5c6194877bc00ede669b1d5d (diff) | |
download | rockbox-b5716df4cb2837bbbc42195cf1aefcf03e21d6a6.tar.gz rockbox-b5716df4cb2837bbbc42195cf1aefcf03e21d6a6.zip |
Build librbcodec with DSP and metadata.
All associated files are moved to /lib/rbcodec.
Change-Id: I572ddd2b8a996aae1e98c081d06b1ed356dce222
Diffstat (limited to 'apps/metadata/mp3.c')
-rw-r--r-- | apps/metadata/mp3.c | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/apps/metadata/mp3.c b/apps/metadata/mp3.c deleted file mode 100644 index feb1a52f77..0000000000 --- a/apps/metadata/mp3.c +++ /dev/null | |||
@@ -1,193 +0,0 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2002 by Daniel Stenberg | ||
11 | * | ||
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. | ||
16 | * | ||
17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
18 | * KIND, either express or implied. | ||
19 | * | ||
20 | ****************************************************************************/ | ||
21 | /* | ||
22 | * Parts of this code has been stolen from the Ample project and was written | ||
23 | * by David H�deman. It has since been extended and enhanced pretty much by | ||
24 | * all sorts of friendly Rockbox people. | ||
25 | * | ||
26 | */ | ||
27 | |||
28 | /* tagResolver and associated code copyright 2003 Thomas Paul Diffenbach | ||
29 | */ | ||
30 | |||
31 | #include <stdio.h> | ||
32 | #include <stdlib.h> | ||
33 | #include <string.h> | ||
34 | #include <stdbool.h> | ||
35 | #include "string-extra.h" | ||
36 | #include "config.h" | ||
37 | #include "file.h" | ||
38 | #include "logf.h" | ||
39 | |||
40 | #include "system.h" | ||
41 | #include "metadata.h" | ||
42 | #include "mp3data.h" | ||
43 | #include "metadata_common.h" | ||
44 | #include "metadata_parsers.h" | ||
45 | |||
46 | /* | ||
47 | * Calculates the length (in milliseconds) of an MP3 file. | ||
48 | * | ||
49 | * Modified to only use integers. | ||
50 | * | ||
51 | * Arguments: file - the file to calculate the length upon | ||
52 | * entry - the entry to update with the length | ||
53 | * | ||
54 | * Returns: the song length in milliseconds, | ||
55 | * 0 means that it couldn't be calculated | ||
56 | */ | ||
57 | static int getsonglength(int fd, struct mp3entry *entry) | ||
58 | { | ||
59 | unsigned long filetime = 0; | ||
60 | struct mp3info info; | ||
61 | long bytecount; | ||
62 | |||
63 | /* Start searching after ID3v2 header */ | ||
64 | if(-1 == lseek(fd, entry->id3v2len, SEEK_SET)) | ||
65 | return 0; | ||
66 | |||
67 | bytecount = get_mp3file_info(fd, &info); | ||
68 | |||
69 | logf("Space between ID3V2 tag and first audio frame: 0x%lx bytes", | ||
70 | bytecount); | ||
71 | |||
72 | if(bytecount < 0) | ||
73 | return -1; | ||
74 | |||
75 | bytecount += entry->id3v2len; | ||
76 | |||
77 | /* Validate byte count, in case the file has been edited without | ||
78 | * updating the header. | ||
79 | */ | ||
80 | if (info.byte_count) | ||
81 | { | ||
82 | const unsigned long expected = entry->filesize - entry->id3v1len | ||
83 | - entry->id3v2len; | ||
84 | const unsigned long diff = MAX(10240, info.byte_count / 20); | ||
85 | |||
86 | if ((info.byte_count > expected + diff) | ||
87 | || (info.byte_count < expected - diff)) | ||
88 | { | ||
89 | logf("Note: info.byte_count differs from expected value by " | ||
90 | "%ld bytes", labs((long) (expected - info.byte_count))); | ||
91 | info.byte_count = 0; | ||
92 | info.frame_count = 0; | ||
93 | info.file_time = 0; | ||
94 | info.enc_padding = 0; | ||
95 | |||
96 | /* Even if the bitrate was based on "known bad" values, it | ||
97 | * should still be better for VBR files than using the bitrate | ||
98 | * of the first audio frame. | ||
99 | */ | ||
100 | } | ||
101 | } | ||
102 | |||
103 | entry->bitrate = info.bitrate; | ||
104 | entry->frequency = info.frequency; | ||
105 | entry->layer = info.layer; | ||
106 | switch(entry->layer) { | ||
107 | #if CONFIG_CODEC==SWCODEC | ||
108 | case 0: | ||
109 | entry->codectype=AFMT_MPA_L1; | ||
110 | break; | ||
111 | #endif | ||
112 | case 1: | ||
113 | entry->codectype=AFMT_MPA_L2; | ||
114 | break; | ||
115 | case 2: | ||
116 | entry->codectype=AFMT_MPA_L3; | ||
117 | break; | ||
118 | } | ||
119 | |||
120 | /* If the file time hasn't been established, this may be a fixed | ||
121 | rate MP3, so just use the default formula */ | ||
122 | |||
123 | filetime = info.file_time; | ||
124 | |||
125 | if(filetime == 0) | ||
126 | { | ||
127 | /* Prevent a division by zero */ | ||
128 | if (info.bitrate < 8) | ||
129 | filetime = 0; | ||
130 | else | ||
131 | filetime = (entry->filesize - bytecount) / (info.bitrate / 8); | ||
132 | /* bitrate is in kbps so this delivers milliseconds. Doing bitrate / 8 | ||
133 | * instead of filesize * 8 is exact, because mpeg audio bitrates are | ||
134 | * always multiples of 8, and it avoids overflows. */ | ||
135 | } | ||
136 | |||
137 | entry->frame_count = info.frame_count; | ||
138 | |||
139 | entry->vbr = info.is_vbr; | ||
140 | entry->has_toc = info.has_toc; | ||
141 | |||
142 | #if CONFIG_CODEC==SWCODEC | ||
143 | if (!entry->lead_trim) | ||
144 | entry->lead_trim = info.enc_delay; | ||
145 | if (!entry->tail_trim) | ||
146 | entry->tail_trim = info.enc_padding; | ||
147 | #endif | ||
148 | |||
149 | memcpy(entry->toc, info.toc, sizeof(info.toc)); | ||
150 | |||
151 | /* Update the seek point for the first playable frame */ | ||
152 | entry->first_frame_offset = bytecount; | ||
153 | logf("First frame is at %lx", entry->first_frame_offset); | ||
154 | |||
155 | return filetime; | ||
156 | } | ||
157 | |||
158 | /* | ||
159 | * Checks all relevant information (such as ID3v1 tag, ID3v2 tag, length etc) | ||
160 | * about an MP3 file and updates it's entry accordingly. | ||
161 | * | ||
162 | Note, that this returns true for successful, false for error! */ | ||
163 | bool get_mp3_metadata(int fd, struct mp3entry *entry) | ||
164 | { | ||
165 | entry->title = NULL; | ||
166 | entry->filesize = filesize(fd); | ||
167 | entry->id3v2len = getid3v2len(fd); | ||
168 | entry->tracknum = 0; | ||
169 | entry->discnum = 0; | ||
170 | |||
171 | if (entry->id3v2len) | ||
172 | setid3v2title(fd, entry); | ||
173 | int len = getsonglength(fd, entry); | ||
174 | if (len < 0) | ||
175 | return false; | ||
176 | entry->length = len; | ||
177 | |||
178 | /* Subtract the meta information from the file size to get | ||
179 | the true size of the MP3 stream */ | ||
180 | entry->filesize -= entry->first_frame_offset; | ||
181 | |||
182 | /* only seek to end of file if no id3v2 tags were found */ | ||
183 | if (!entry->id3v2len) { | ||
184 | setid3v1title(fd, entry); | ||
185 | } | ||
186 | |||
187 | if(!entry->length || (entry->filesize < 8 )) | ||
188 | /* no song length or less than 8 bytes is hereby considered to be an | ||
189 | invalid mp3 and won't be played by us! */ | ||
190 | return false; | ||
191 | |||
192 | return true; | ||
193 | } | ||