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28e9141a RK |
1 | /* |
2 | * This file is part of DisOrder. | |
3 | * Copyright (C) 2004, 2005, 2007 Richard Kettlewell | |
4 | * | |
5 | * This program is free software: you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation, either version 3 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | /** @file plugins/tracklength-flac.c | |
19 | * @brief Compute track lengths for FLAC files | |
20 | */ | |
21 | #include "tracklength.h" | |
22 | #include <FLAC/stream_decoder.h> | |
23 | ||
24 | /* libFLAC's "simplified" interface is rather heavyweight... */ | |
25 | ||
26 | struct flac_state { | |
27 | long duration; | |
28 | const char *path; | |
29 | }; | |
30 | ||
31 | static void flac_metadata(const FLAC__StreamDecoder attribute((unused)) *decoder, | |
32 | const FLAC__StreamMetadata *metadata, | |
33 | void *client_data) { | |
34 | struct flac_state *const state = client_data; | |
35 | const FLAC__StreamMetadata_StreamInfo *const stream_info | |
36 | = &metadata->data.stream_info; | |
37 | ||
38 | if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) | |
39 | /* FLAC uses 0 to mean unknown and conveniently so do we */ | |
40 | state->duration = (stream_info->total_samples | |
41 | + stream_info->sample_rate - 1) | |
42 | / stream_info->sample_rate; | |
43 | } | |
44 | ||
45 | static void flac_error(const FLAC__StreamDecoder attribute((unused)) *decoder, | |
46 | FLAC__StreamDecoderErrorStatus status, | |
47 | void *client_data) { | |
48 | const struct flac_state *const state = client_data; | |
49 | ||
50 | disorder_error(0, "error decoding %s: %s", state->path, | |
51 | FLAC__StreamDecoderErrorStatusString[status]); | |
52 | } | |
53 | ||
54 | static FLAC__StreamDecoderWriteStatus flac_write | |
55 | (const FLAC__StreamDecoder attribute((unused)) *decoder, | |
56 | const FLAC__Frame attribute((unused)) *frame, | |
57 | const FLAC__int32 attribute((unused)) *const buffer_[], | |
58 | void attribute((unused)) *client_data) { | |
59 | const struct flac_state *const state = client_data; | |
60 | ||
61 | if(state->duration >= 0) | |
62 | return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; | |
63 | else | |
64 | return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; | |
65 | } | |
66 | ||
67 | long tl_flac(const char *path) { | |
68 | FLAC__StreamDecoder *sd = 0; | |
69 | FLAC__StreamDecoderInitStatus is; | |
70 | struct flac_state state[1]; | |
71 | ||
72 | state->duration = -1; /* error */ | |
73 | state->path = path; | |
74 | if(!(sd = FLAC__stream_decoder_new())) { | |
75 | disorder_error(0, "FLAC__stream_decoder_new failed"); | |
76 | goto fail; | |
77 | } | |
78 | if((is = FLAC__stream_decoder_init_file(sd, path, flac_write, flac_metadata, | |
79 | flac_error, state))) { | |
80 | disorder_error(0, "FLAC__stream_decoder_init_file %s: %s", | |
81 | path, FLAC__StreamDecoderInitStatusString[is]); | |
82 | goto fail; | |
83 | } | |
84 | FLAC__stream_decoder_process_until_end_of_metadata(sd); | |
85 | fail: | |
86 | if(sd) | |
87 | FLAC__stream_decoder_delete(sd); | |
88 | return state->duration; | |
89 | } | |
90 | ||
91 | /* | |
92 | Local Variables: | |
93 | c-basic-offset:2 | |
94 | comment-column:40 | |
95 | fill-column:79 | |
96 | End: | |
97 | */ |