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

   1 /*
   2     Copyright © 2015-2018, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include "alsa_hostlib.h"
   7 #include <proto/hostlib.h>
   8
   9 #include <aros/debug.h>
  10
  11 #define LIBASOUND_SOFILE "libasound.so.2"
  12
  13 static const char *alsa_func_names[] =
  14 {
  15     "snd_pcm_open",
  16     "snd_pcm_close",
  17     "snd_pcm_hw_params_malloc",
  18     "snd_pcm_hw_params_free",
  19     "snd_pcm_hw_params_any",
  20     "snd_pcm_hw_params_set_access",
  21     "snd_pcm_hw_params_set_format",
  22     "snd_pcm_hw_params_set_rate_near",
  23     "snd_pcm_hw_params_set_channels",
  24     "snd_pcm_hw_params",
  25     "snd_pcm_prepare",
  26     "snd_pcm_writei",
  27     "snd_pcm_avail_update",
  28     "snd_pcm_hw_params_get_buffer_size",
  29     "snd_pcm_hw_params_set_buffer_size",
  30     "snd_pcm_drop",
  31
  32     "snd_mixer_open",
  33     "snd_mixer_close",
  34     "snd_mixer_load",
  35     "snd_mixer_attach",
  36     "snd_mixer_find_selem",
  37     "snd_mixer_selem_register",
  38     "snd_mixer_selem_id_malloc",
  39     "snd_mixer_selem_id_free",
  40     "snd_mixer_selem_id_set_index",
  41     "snd_mixer_selem_id_set_name",
  42     "snd_mixer_selem_get_playback_volume_range",
  43     "snd_mixer_selem_get_playback_volume",
  44     "snd_mixer_selem_set_playback_volume_all",
  45 };
  46
  47 #define ALSA_NUM_FUNCS (sizeof(alsa_func_names) / sizeof(alsa_func_names[0]))
  48
  49 APTR HostLibBase;
  50 struct alsa_func alsa_func;
  51 static void *libasoundhandle;
  52
  53 static void *hostlib_load_so(const char *sofile, const char **names, int nfuncs,
  54         void **funcptr)
  55 {
  56     void *handle;
  57     char *err;
  58     int i;
  59
  60     if ((handle = HostLib_Open(sofile, &err)) == NULL) {
  61         D(bug("[ALSA] failed to open '%s': %s\n", sofile, err));
  62         return NULL;
  63     }
  64
  65     for (i = 0; i < nfuncs; i++) {
  66         funcptr[i] = HostLib_GetPointer(handle, names[i], &err);
  67         if (err != NULL) {
  68             bug("[ALSA] failed to get symbol '%s' (%s)\n", names[i], err);
  69             HostLib_Close(handle, NULL);
  70             return NULL;
  71         }
  72     }
  73
  74     return handle;
  75 }
  76
  77 BOOL ALSA_HostLib_Init()
  78 {
  79     HostLibBase = OpenResource("hostlib.resource");
  80
  81     if (!HostLibBase)
  82     {
  83         D(bug("[ALSA] failed to open hostlib.resource\n"));
  84         return FALSE;
  85     }
  86
  87     libasoundhandle = hostlib_load_so(LIBASOUND_SOFILE, alsa_func_names,
  88             ALSA_NUM_FUNCS, (void **)&alsa_func);
  89
  90     if (!libasoundhandle)
  91     {
  92         bug("[ALSA] failed to open "LIBASOUND_SOFILE"\n");
  93         return FALSE;
  94     }
  95
  96     return TRUE;
  97 }
  98
  99 VOID ALSA_HostLib_Cleanup()
 100 {
 101     if (libasoundhandle != NULL)
 102         HostLib_Close(libasoundhandle, NULL);
 103 }