1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 #include <dlfcn.h>
17 #include <stdio.h>
18 #include <alsa/asoundlib.h>
19
20 #define D(...) fprintf(stderr,__VA_ARGS__)
21 #define STRINGIFY(x) _STRINGIFY(x)
22 #define _STRINGIFY(x) #x
23
24 #define DYN_SYMBOLS \
25 DYN_FUNCTION(size_t,snd_pcm_sw_params_sizeof,(void)) \
26 DYN_FUNCTION(int,snd_pcm_hw_params_current,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)) \
27 DYN_FUNCTION(int,snd_pcm_sw_params_set_start_threshold,(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val)) \
28 DYN_FUNCTION(int,snd_pcm_sw_params,(snd_pcm_t *pcm, snd_pcm_sw_params_t *params)) \
29 DYN_FUNCTION(int,snd_pcm_sw_params_current,(snd_pcm_t *pcm, snd_pcm_sw_params_t *params)) \
30 DYN_FUNCTION(size_t,snd_pcm_hw_params_sizeof,(void)) \
31 DYN_FUNCTION(int,snd_pcm_hw_params_any,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)) \
32 DYN_FUNCTION(int,snd_pcm_hw_params_set_access,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t _access)) \
33 DYN_FUNCTION(int,snd_pcm_hw_params_set_format,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val)) \
34 DYN_FUNCTION(int,snd_pcm_hw_params_set_rate_near,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)) \
35 DYN_FUNCTION(int,snd_pcm_hw_params_set_channels_near,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val)) \
36 DYN_FUNCTION(int,snd_pcm_hw_params_set_buffer_time_near,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)) \
37 DYN_FUNCTION(int,snd_pcm_hw_params,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)) \
38 DYN_FUNCTION(int,snd_pcm_hw_params_get_buffer_size,(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)) \
39 DYN_FUNCTION(int,snd_pcm_prepare,(snd_pcm_t *pcm)) \
40 DYN_FUNCTION(int,snd_pcm_hw_params_get_period_size,(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir)) \
41 DYN_FUNCTION(int,snd_pcm_hw_params_get_period_size_min,(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir)) \
42 DYN_FUNCTION(int,snd_pcm_hw_params_set_period_size,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val, int dir)) \
43 DYN_FUNCTION(int,snd_pcm_hw_params_get_buffer_size_min,(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)) \
44 DYN_FUNCTION(int,snd_pcm_hw_params_set_buffer_size,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val)) \
45 DYN_FUNCTION(int,snd_pcm_hw_params_set_period_time_near,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)) \
46 DYN_FUNCTION(snd_pcm_sframes_t,snd_pcm_avail_update,(snd_pcm_t *pcm)) \
47 DYN_FUNCTION(int,snd_pcm_drop,(snd_pcm_t *pcm)) \
48 DYN_FUNCTION(snd_pcm_sframes_t,snd_pcm_writei,(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size)) \
49 DYN_FUNCTION(snd_pcm_sframes_t,snd_pcm_readi,(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size)) \
50 DYN_FUNCTION(snd_pcm_state_t,snd_pcm_state,(snd_pcm_t *pcm)) \
51 DYN_FUNCTION(const char*,snd_strerror,(int errnum)) \
52 DYN_FUNCTION(int,snd_pcm_open,(snd_pcm_t **pcm, const char *name,snd_pcm_stream_t stream, int mode)) \
53 DYN_FUNCTION(int,snd_pcm_close,(snd_pcm_t *pcm)) \
54
55
56
57 /* define pointers to library functions we're going to use */
58 #define DYN_FUNCTION(ret,name,sig) \
59 static ret (*func_ ## name)sig;
60
61 DYN_SYMBOLS
62
63 #undef DYN_FUNCTION
64
65 #define func_snd_pcm_hw_params_alloca(ptr) \
66 do { assert(ptr); *ptr = (snd_pcm_hw_params_t *) alloca(func_snd_pcm_hw_params_sizeof()); memset(*ptr, 0, func_snd_pcm_hw_params_sizeof()); } while (0)
67
68 #define func_snd_pcm_sw_params_alloca(ptr) \
69 do { assert(ptr); *ptr = (snd_pcm_sw_params_t *) alloca(func_snd_pcm_sw_params_sizeof()); memset(*ptr, 0, func_snd_pcm_sw_params_sizeof()); } while (0)
70
71 static void* alsa_lib;
72
main(void)73 int main(void)
74 {
75 int result = 1;
76
77 alsa_lib = dlopen( "libasound.so", RTLD_NOW );
78 if (alsa_lib == NULL)
79 alsa_lib = dlopen( "libasound.so.2", RTLD_NOW );
80
81 if (alsa_lib == NULL) {
82 D("could not find libasound on this system\n");
83 return 1;
84 }
85
86 #undef DYN_FUNCTION
87 #define DYN_FUNCTION(ret,name,sig) \
88 do { \
89 (func_ ##name) = dlsym( alsa_lib, STRINGIFY(name) ); \
90 if ((func_##name) == NULL) { \
91 D("could not find %s in libasound\n", STRINGIFY(name)); \
92 goto Fail; \
93 } \
94 } while (0);
95
96 DYN_SYMBOLS
97
98 result = 0;
99 goto Exit;
100
101 Fail:
102 D("failed to open library\n");
103
104 Exit:
105 dlclose(alsa_lib);
106 return result;
107 }
108