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
|
/*
* Copyright (C) 2003-2013 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"
#include "AutoConvertFilterPlugin.hxx"
#include "ConvertFilterPlugin.hxx"
#include "FilterPlugin.hxx"
#include "FilterInternal.hxx"
#include "FilterRegistry.hxx"
#include "audio_format.h"
#include <assert.h>
struct AutoConvertFilter {
struct filter base;
/**
* The audio format being fed to the underlying filter. This
* plugin actually doesn't need this variable, we have it here
* just so our open() method doesn't return a stack pointer.
*/
struct audio_format in_audio_format;
/**
* The underlying filter.
*/
struct filter *filter;
/**
* A convert_filter, just in case conversion is needed. nullptr
* if unused.
*/
struct filter *convert;
AutoConvertFilter(const filter_plugin &plugin, struct filter *_filter)
:filter(_filter) {
filter_init(&base, &plugin);
}
~AutoConvertFilter() {
filter_free(filter);
}
};
static void
autoconvert_filter_finish(struct filter *_filter)
{
AutoConvertFilter *filter = (AutoConvertFilter *)_filter;
delete filter;
}
static const struct audio_format *
autoconvert_filter_open(struct filter *_filter,
struct audio_format *in_audio_format,
GError **error_r)
{
AutoConvertFilter *filter = (AutoConvertFilter *)_filter;
const struct audio_format *out_audio_format;
assert(audio_format_valid(in_audio_format));
/* open the "real" filter */
filter->in_audio_format = *in_audio_format;
out_audio_format = filter_open(filter->filter,
&filter->in_audio_format, error_r);
if (out_audio_format == nullptr)
return nullptr;
/* need to convert? */
if (!audio_format_equals(&filter->in_audio_format, in_audio_format)) {
/* yes - create a convert_filter */
struct audio_format audio_format2 = *in_audio_format;
const struct audio_format *audio_format3;
filter->convert = filter_new(&convert_filter_plugin, nullptr,
error_r);
if (filter->convert == nullptr) {
filter_close(filter->filter);
return nullptr;
}
audio_format3 = filter_open(filter->convert, &audio_format2,
error_r);
if (audio_format3 == nullptr) {
filter_free(filter->convert);
filter_close(filter->filter);
return nullptr;
}
assert(audio_format_equals(&audio_format2, in_audio_format));
convert_filter_set(filter->convert, &filter->in_audio_format);
} else
/* no */
filter->convert = nullptr;
return out_audio_format;
}
static void
autoconvert_filter_close(struct filter *_filter)
{
AutoConvertFilter *filter =
(AutoConvertFilter *)_filter;
if (filter->convert != nullptr) {
filter_close(filter->convert);
filter_free(filter->convert);
}
filter_close(filter->filter);
}
static const void *
autoconvert_filter_filter(struct filter *_filter, const void *src,
size_t src_size, size_t *dest_size_r,
GError **error_r)
{
AutoConvertFilter *filter = (AutoConvertFilter *)_filter;
if (filter->convert != nullptr) {
src = filter_filter(filter->convert, src, src_size, &src_size,
error_r);
if (src == nullptr)
return nullptr;
}
return filter_filter(filter->filter, src, src_size, dest_size_r,
error_r);
}
static const struct filter_plugin autoconvert_filter_plugin = {
"convert",
nullptr,
autoconvert_filter_finish,
autoconvert_filter_open,
autoconvert_filter_close,
autoconvert_filter_filter,
};
struct filter *
autoconvert_filter_new(struct filter *_filter)
{
AutoConvertFilter *filter =
new AutoConvertFilter(autoconvert_filter_plugin,
_filter);
return &filter->base;
}
|
