check-alsa.rar_Only

/* * * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include <dlfcn.h> #include <stdio.h> #include <alsa/asoundlib.h> #define D(...) fprintf(stderr,__VA_ARGS__) #define STRINGIFY(x) _STRINGIFY(x) #define _STRINGIFY(x) #x #define DYN_SYMBOLS \ DYN_FUNCTION(size_t,snd_pcm_sw_params_sizeof,(void)) \ DYN_FUNCTION(int,snd_pcm_hw_params_current,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)) \ 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)) \ DYN_FUNCTION(int,snd_pcm_sw_params,(snd_pcm_t *pcm, snd_pcm_sw_params_t *params)) \ DYN_FUNCTION(int,snd_pcm_sw_params_current,(snd_pcm_t *pcm, snd_pcm_sw_params_t *params)) \ DYN_FUNCTION(size_t,snd_pcm_hw_params_sizeof,(void)) \ DYN_FUNCTION(int,snd_pcm_hw_params_any,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)) \ DYN_FUNCTION(int,snd_pcm_hw_params_set_access,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t _access)) \ DYN_FUNCTION(int,snd_pcm_hw_params_set_format,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val)) \ 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)) \ DYN_FUNCTION(int,snd_pcm_hw_params_set_channels_near,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val)) \ 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)) \ DYN_FUNCTION(int,snd_pcm_hw_params,(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)) \ DYN_FUNCTION(int,snd_pcm_hw_params_get_buffer_size,(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)) \ DYN_FUNCTION(int,snd_pcm_prepare,(snd_pcm_t *pcm)) \ DYN_FUNCTION(int,snd_pcm_hw_params_get_period_size,(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir)) \ 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)) \ 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)) \ DYN_FUNCTION(int,snd_pcm_hw_params_get_buffer_size_min,(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)) \ 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)) \ 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)) \ DYN_FUNCTION(snd_pcm_sframes_t,snd_pcm_avail_update,(snd_pcm_t *pcm)) \ DYN_FUNCTION(int,snd_pcm_drop,(snd_pcm_t *pcm)) \ DYN_FUNCTION(snd_pcm_sframes_t,snd_pcm_writei,(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size)) \ DYN_FUNCTION(snd_pcm_sframes_t,snd_pcm_readi,(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size)) \ DYN_FUNCTION(snd_pcm_state_t,snd_pcm_state,(snd_pcm_t *pcm)) \ DYN_FUNCTION(const char*,snd_strerror,(int errnum)) \ DYN_FUNCTION(int,snd_pcm_open,(snd_pcm_t **pcm, const char *name,snd_pcm_stream_t stream, int mode)) \ DYN_FUNCTION(int,snd_pcm_close,(snd_pcm_t *pcm)) \ /* define pointers to library functions we're going to use */ #define DYN_FUNCTION(ret,name,sig) \ static ret (*func_ ## name)sig; DYN_SYMBOLS #undef DYN_FUNCTION #define func_snd_pcm_hw_params_alloca(ptr) \ 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) #define func_snd_pcm_sw_params_alloca(ptr) \ 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) static void* alsa_lib; int main(void) { int result = 1; alsa_lib = dlopen( "libasound.so", RTLD_NOW ); if (alsa_lib == NULL) alsa_lib = dlopen( "libasound.so.2", RTLD_NOW ); if (alsa_lib == NULL) { D("could not find libasound on this system\n"); return 1; } #undef DYN_FUNCTION #define DYN_FUNCTION(ret,name,sig) \ do { \ (func_ ##name) = dlsym( alsa_lib, STRINGIFY(name) ); \ if ((func_##name) == NULL) { \ D("could not find %s in libasound\n", STRINGIFY(name)); \ goto Fail; \ } \ } while (0); DYN_SYMBOLS result = 0; goto Exit; Fail: D("failed to open library\n"); Exit: dlclose(alsa_lib); return result; }