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 #define LIBASOUND_SOFILE "libasound.so.2"
  13
  14 static const char *alsa_func_names[] =
  15 {
  16     "snd_pcm_open",
  17     "snd_pcm_close",
  18     "snd_pcm_hw_params_malloc",
  19     "snd_pcm_hw_params_free",
  20     "snd_pcm_hw_params_any",
  21     "snd_pcm_hw_params_set_access",
  22     "snd_pcm_hw_params_set_format",
  23     "snd_pcm_hw_params_set_rate_near",
  24     "snd_pcm_hw_params_set_channels",
  25     "snd_pcm_hw_params",
  26     "snd_pcm_prepare",
  27     "snd_pcm_writei",
  28     "snd_pcm_avail_update",
  29     "snd_pcm_hw_params_get_buffer_size",
  30     "snd_pcm_hw_params_set_buffer_size",
  31     "snd_pcm_drop",
  32 };
  33
  34 #define ALSA_NUM_FUNCS (sizeof(alsa_func_names) / sizeof(alsa_func_names[0]))
  35
  36 APTR HostLibBase;
  37 struct alsa_func alsa_func;
  38 static void * libasoundhandle;
  39
  40 static void *hostlib_load_so(const char *sofile, const char **names, int nfuncs,
  41         void **funcptr)
  42 {
  43     void *handle;
  44     char *err;
  45     int i;
  46
  47     if ((handle = HostLib_Open(sofile, &err)) == NULL) {
  48         D(bug("[ALSA] failed to open '%s': %s\n", sofile, err));
  49         return NULL;
  50     }
  51
  52     for (i = 0; i < nfuncs; i++) {
  53         funcptr[i] = HostLib_GetPointer(handle, names[i], &err);
  54         if (err != NULL) {
  55             bug("[ALSA] failed to get symbol '%s' (%s)\n", names[i], err);
  56             HostLib_Close(handle, NULL);
  57             return NULL;
  58         }
  59     }
  60
  61     return handle;
  62 }
  63
  64 BOOL ALSA_HostLib_Init()
  65 {
  66     HostLibBase = OpenResource("hostlib.resource");
  67
  68     if (!HostLibBase)
  69         return FALSE;
  70
  71     libasoundhandle = hostlib_load_so(LIBASOUND_SOFILE, alsa_func_names,
  72             ALSA_NUM_FUNCS, (void **)&alsa_func);
  73
  74     if (!libasoundhandle)
  75         return FALSE;
  76
  77     return TRUE;
  78 }
  79
  80 VOID ALSA_HostLib_Cleanup()
  81 {
  82     HostLib_Close(libasoundhandle, NULL);
  83 }