workbench/devs/AHI/Drivers/Alsa/alsa-bridge/alsa_hostlib.c

   1 /*
   2     Copyright © 2015, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <proto/exec.h>
   7 #include <proto/hostlib.h>
   8 #include "alsa_hostlib.h"
   9
  10 #include <aros/debug.h>
  11
  12 static const char *alsa_func_names[] =
  13 {
  14     "snd_pcm_open",
  15     "snd_pcm_close",
  16     "snd_pcm_hw_params_malloc",
  17     "snd_pcm_hw_params_free",
  18     "snd_pcm_hw_params_any",
  19     "snd_pcm_hw_params_set_access",
  20     "snd_pcm_hw_params_set_format",
  21     "snd_pcm_hw_params_set_rate_near",
  22     "snd_pcm_hw_params_set_channels",
  23     "snd_pcm_hw_params",
  24     "snd_pcm_prepare",
  25     "snd_pcm_writei",
  26     "snd_pcm_avail_update",
  27     "snd_pcm_hw_params_get_buffer_size",
  28     "snd_pcm_hw_params_set_buffer_size"
  29 };
  30
  31 #define ALSA_NUM_FUNCS (sizeof(alsa_func_names) / sizeof(alsa_func_names[0]))
  32
  33 APTR HostLibBase;
  34 struct alsa_func alsa_func;
  35 static void * libasoundhandle;
  36
  37 static void *hostlib_load_so(const char *sofile, const char **names, int nfuncs,
  38         void **funcptr)
  39 {
  40     void *handle;
  41     char *err;
  42     int i;
  43
  44     if ((handle = HostLib_Open(sofile, &err)) == NULL) {
  45         D(bug("[ALSA] failed to open '%s': %s\n", sofile, err));
  46         return NULL;
  47     }
  48
  49     for (i = 0; i < nfuncs; i++) {
  50         funcptr[i] = HostLib_GetPointer(handle, names[i], &err);
  51         if (err != NULL) {
  52             bug("[ALSA] failed to get symbol '%s' (%s)\n", names[i], err);
  53             HostLib_Close(handle, NULL);
  54             return NULL;
  55         }
  56     }
  57
  58     return handle;
  59 }
  60
  61 BOOL ALSA_HostLib_Init()
  62 {
  63     HostLibBase = OpenResource("hostlib.resource");
  64
  65     if (!HostLibBase)
  66         return FALSE;
  67
  68     libasoundhandle = hostlib_load_so("libasound.so", alsa_func_names,
  69             ALSA_NUM_FUNCS, (void **)&alsa_func);
  70
  71     if (!libasoundhandle)
  72         return FALSE;
  73
  74     return TRUE;
  75 }
  76
  77 VOID ALSA_HostLib_Cleanup()
  78 {
  79     HostLib_Close(libasoundhandle, NULL);
  80 }