1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
/*
* Copyright (C) 2003-2009 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h" /* must be first for large file support */
#include "decoder_api.h"
#include "audio_check.h"
#include <glib.h>
#include <mpg123.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "mpg123"
static bool
mpd_mpg123_init(G_GNUC_UNUSED const struct config_param *param)
{
mpg123_init();
return true;
}
static void
mpd_mpg123_finish(void)
{
mpg123_exit();
}
/**
* Opens a file with an existing #mpg123_handle.
*
* @param handle a handle which was created before; on error, this
* function will not free it
* @param audio_format this parameter is filled after successful
* return
* @return true on success
*/
static bool
mpd_mpg123_open(mpg123_handle *handle, const char *path_fs,
struct audio_format *audio_format)
{
GError *gerror = NULL;
char *path_dup;
int error;
int channels, encoding;
long rate;
/* mpg123_open() wants a writable string :-( */
path_dup = g_strdup(path_fs);
error = mpg123_open(handle, path_dup);
g_free(path_dup);
if (error != MPG123_OK) {
g_warning("libmpg123 failed to open %s: %s",
path_fs, mpg123_plain_strerror(error));
return false;
}
/* obtain the audio format */
error = mpg123_getformat(handle, &rate, &channels, &encoding);
if (error != MPG123_OK) {
g_warning("mpg123_getformat() failed: %s",
mpg123_plain_strerror(error));
return false;
}
if (encoding != MPG123_ENC_SIGNED_16) {
/* other formats not yet implemented */
g_warning("expected MPG123_ENC_SIGNED_16, got %d", encoding);
return false;
}
if (!audio_format_init_checked(audio_format, rate, SAMPLE_FORMAT_S16,
channels, &gerror)) {
g_warning("%s", gerror->message);
g_error_free(gerror);
return false;
}
return true;
}
static void
mpd_mpg123_file_decode(struct decoder *decoder, const char *path_fs)
{
struct audio_format audio_format;
mpg123_handle *handle;
int error;
off_t num_samples, position;
enum decoder_command cmd;
/* open the file */
handle = mpg123_new(NULL, &error);
if (handle == NULL) {
g_warning("mpg123_new() failed: %s",
mpg123_plain_strerror(error));
return;
}
if (!mpd_mpg123_open(handle, path_fs, &audio_format)) {
mpg123_delete(handle);
return;
}
num_samples = mpg123_length(handle);
/* tell MPD core we're ready */
decoder_initialized(decoder, &audio_format, false,
(float)num_samples /
(float)audio_format.sample_rate);
/* the decoder main loop */
do {
unsigned char buffer[8192];
size_t nbytes;
position = mpg123_tell(handle);
/* decode */
error = mpg123_read(handle, buffer, sizeof(buffer), &nbytes);
if (error != MPG123_OK) {
if (error != MPG123_DONE)
g_warning("mpg123_read() failed: %s",
mpg123_plain_strerror(error));
break;
}
/* send to MPD */
cmd = decoder_data(decoder, NULL, buffer, nbytes,
(float)position /
(float)audio_format.sample_rate,
0, NULL);
/* seeking not yet implemented */
} while (cmd == DECODE_COMMAND_NONE);
/* cleanup */
mpg123_delete(handle);
}
static struct tag *
mpd_mpg123_tag_dup(const char *path_fs)
{
struct audio_format audio_format;
mpg123_handle *handle;
int error;
off_t num_samples;
struct tag *tag;
handle = mpg123_new(NULL, &error);
if (handle == NULL) {
g_warning("mpg123_new() failed: %s",
mpg123_plain_strerror(error));
return NULL;
}
if (!mpd_mpg123_open(handle, path_fs, &audio_format)) {
mpg123_delete(handle);
return NULL;
}
num_samples = mpg123_length(handle);
if (num_samples <= 0) {
mpg123_delete(handle);
return NULL;
}
tag = tag_new();
tag->time = num_samples / audio_format.sample_rate;
/* ID3 tag support not yet implemented */
mpg123_delete(handle);
return tag;
}
static const char *const mpg123_suffixes[] = {
"mp3",
NULL
};
const struct decoder_plugin mpg123_decoder_plugin = {
.name = "mpg123",
.init = mpd_mpg123_init,
.finish = mpd_mpg123_finish,
.file_decode = mpd_mpg123_file_decode,
/* streaming not yet implemented */
.tag_dup = mpd_mpg123_tag_dup,
.suffixes = mpg123_suffixes,
};
|
