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

   1 /*
   2     Copyright © 2015, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include "alsa_hostlib.h"
   7 #include "alsa.h"
   8
   9 #define CARDNAME    "default"
  10 #define VOLUMENAME  "Master"
  11
  12 BOOL ALSA_Init()
  13 {
  14     return ALSA_HostLib_Init();
  15 }
  16
  17 VOID ALSA_Cleanup()
  18 {
  19     ALSA_HostLib_Cleanup();
  20 }
  21
  22 VOID ALSA_MixerInit(APTR * handle, APTR * elem, LONG * min, LONG * max)
  23 {
  24     snd_mixer_t * _handle;
  25     snd_mixer_selem_id_t * _sid;
  26     snd_mixer_elem_t * _elem;
  27
  28     *handle = NULL;
  29     *elem = NULL;
  30
  31     ALSACALL(snd_mixer_open,&_handle, 0);
  32     ALSACALL(snd_mixer_attach,_handle, CARDNAME);
  33     ALSACALL(snd_mixer_selem_register,_handle, NULL, NULL);
  34     ALSACALL(snd_mixer_load,_handle);
  35
  36     ALSACALL(snd_mixer_selem_id_malloc,&_sid);
  37     ALSACALL(snd_mixer_selem_id_set_index,_sid, 0);
  38     ALSACALL(snd_mixer_selem_id_set_name,_sid, VOLUMENAME);
  39     _elem = ALSACALL(snd_mixer_find_selem,_handle, _sid);
  40
  41     if (_elem != NULL)
  42     {
  43         long a,b;
  44         ALSACALL(snd_mixer_selem_get_playback_volume_range,_elem, &a, &b);
  45
  46         *handle = _handle;
  47         *elem   = _elem;
  48         *min = (LONG)a;
  49         *max = (LONG)b;
  50     }
  51
  52     ALSACALL(snd_mixer_selem_id_free,_sid);
  53 }
  54
  55 VOID ALSA_MixerCleanup(APTR handle)
  56 {
  57     ALSACALL(snd_mixer_close,handle);
  58 }
  59
  60 LONG ALSA_MixerGetVolume(APTR elem)
  61 {
  62     long _ret = 0;
  63
  64     ALSACALL(snd_mixer_selem_get_playback_volume, elem,
  65             SND_MIXER_SCHN_FRONT_LEFT, &_ret);
  66     return (LONG)_ret;
  67 }
  68
  69 VOID ALSA_MixerSetVolume(APTR elem, LONG volume)
  70 {
  71     ALSACALL(snd_mixer_selem_set_playback_volume_all, elem, volume);
  72 }
  73
  74 APTR ALSA_Open()
  75 {
  76     snd_pcm_t * handle = NULL;
  77
  78
  79     if (ALSACALL(snd_pcm_open, &handle, CARDNAME,
  80             SND_PCM_STREAM_PLAYBACK, 0) < 0)
  81         return NULL;
  82
  83     return handle;
  84 }
  85
  86 VOID ALSA_DropAndClose(APTR handle)
  87 {
  88     if (handle)
  89     {
  90         ALSACALL(snd_pcm_drop, handle);
  91         ALSACALL(snd_pcm_close, handle);
  92     }
  93 }
  94
  95 BOOL ALSA_SetHWParams(APTR handle, ULONG * rate)
  96 {
  97     snd_pcm_hw_params_t * hw_params;
  98     LONG dir = 0; int r = 0;
  99
 100     ALSACALL(snd_pcm_hw_params_malloc, &hw_params);
 101     ALSACALL(snd_pcm_hw_params_any, handle, hw_params);
 102     ALSACALL(snd_pcm_hw_params_set_access, handle, hw_params,
 103             SND_PCM_ACCESS_RW_INTERLEAVED);
 104     ALSACALL(snd_pcm_hw_params_set_format, handle, hw_params,
 105             SND_PCM_FORMAT_S16_LE);
 106     ALSACALL(snd_pcm_hw_params_set_channels, handle, hw_params, 2);
 107     r = ALSACALL(snd_pcm_hw_params_set_rate_near, handle, hw_params, rate, &dir);
 108     ALSACALL(snd_pcm_hw_params_set_buffer_size, handle, hw_params, 2048);
 109
 110     ALSACALL(snd_pcm_hw_params, handle, hw_params);
 111     ALSACALL(snd_pcm_hw_params_free, hw_params);
 112
 113     return (r >= 0);
 114 }
 115
 116 LONG ALSA_Write(APTR handle, APTR buffer, ULONG size)
 117 {
 118     LONG rc = ALSACALL(snd_pcm_writei, handle, buffer, (snd_pcm_uframes_t)size);
 119
 120     if (rc == -EPIPE)
 121         rc = ALSA_XRUN;
 122
 123     return rc;
 124 }
 125
 126 VOID ALSA_Prepare(APTR handle)
 127 {
 128     ALSACALL(snd_pcm_prepare, handle);
 129 }
 130
 131 LONG ALSA_Avail(APTR handle)
 132 {
 133     LONG rc = ALSACALL(snd_pcm_avail_update, handle);
 134     if (rc == -EPIPE)
 135         rc = ALSA_XRUN;
 136
 137     return rc;
 138 }