workbench/devs/AHI/Examples/Low-level/BestAudioID/BestAudioID.c

   1 /* Simple AHI_BestAudioID() example */
   2
   3 #include <devices/ahi.h>
   4 #include <proto/exec.h>
   5 #include <proto/dos.h>
   6 #include <proto/ahi.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9
  10 struct Library    *AHIBase;
  11 struct MsgPort    *AHImp=NULL;
  12 struct AHIRequest *AHIio=NULL;
  13 BYTE               AHIDevice=-1;
  14
  15 void cleanup(LONG rc)
  16 {
  17   if(!AHIDevice)
  18     CloseDevice((struct IORequest *)AHIio);
  19   DeleteIORequest((struct IORequest *)AHIio);
  20   DeleteMsgPort(AHImp);
  21   exit(rc);
  22 }
  23
  24 void printmode(ULONG id) {
  25   char name[40];
  26
  27   if(id != AHI_INVALID_ID) {
  28     name[0] = '\0';
  29     AHI_GetAudioAttrs(id, NULL,
  30         AHIDB_BufferLen, 40,
  31         AHIDB_Name, (IPTR) name,
  32         TAG_DONE);
  33   }
  34   else {
  35     strncpy(name, "Non-existing mode!", 40);
  36   }
  37
  38   Printf("\nMode 0x%08lx (%s):\n",  id, name);
  39 }
  40
  41
  42 void main(void)
  43 {
  44   ULONG mainid, id;
  45
  46   if(AHImp=CreateMsgPort())
  47     if(AHIio=(struct AHIRequest *)CreateIORequest(AHImp,sizeof(struct AHIRequest))) {
  48       AHIio->ahir_Version = 4;
  49       AHIDevice=OpenDevice(AHINAME,AHI_NO_UNIT,(struct IORequest *)AHIio,NULL);
  50       }
  51
  52   if(AHIDevice) {
  53     Printf("Unable to open %s version 4\n",AHINAME);
  54     cleanup(RETURN_FAIL);
  55   }
  56   AHIBase=(struct Library *)AHIio->ahir_Std.io_Device;
  57
  58   mainid = AHI_BestAudioID(AHIDB_Stereo,TRUE,
  59                      AHIDB_Volume,TRUE,
  60                      AHIDB_Bits,8,
  61                      AHIDB_MaxChannels,4,
  62                      TAG_DONE);
  63   printmode(mainid);
  64   Printf("Stereo, Volume, >= 8 bits and >= 4 channels.\n");
  65
  66   {
  67     struct TagItem tags[] = {
  68       AHIDB_Bits, 12,
  69       AHIDB_Panning, TRUE,
  70       AHIDB_HiFi, TRUE,
  71       TAG_DONE
  72     };
  73     id = AHI_BestAudioID(AHIDB_Stereo,TRUE,
  74                        AHIDB_Volume,TRUE,
  75                        AHIDB_Bits,8,
  76                        AHIDB_MaxChannels,4,
  77                        AHIB_Dizzy, (IPTR) &tags,
  78                        TAG_DONE);
  79     printmode(id);
  80     Printf("Same as 0x%08lx but also, if possible, "
  81            ">= 12 bits, free stereo panning and HiFi mixing.\n", mainid);
  82   }
  83
  84   {
  85     struct TagItem tags[] = {
  86       AHIDB_Bits, 16,
  87       AHIDB_Stereo, FALSE,
  88       TAG_DONE
  89     };
  90
  91     id = AHI_BestAudioID(AHIDB_AudioID,id,
  92                        AHIB_Dizzy, (IPTR) &tags,
  93                        TAG_DONE);
  94
  95     printmode(id);
  96     Printf("Using the same audio hardware at last mode, "
  97            "this modes may have >= 16 bit resolution and be mono. But "
  98            "I'm not sure.\n");
  99   }
 100
 101   id = AHI_BestAudioID(AHIDB_Realtime, FALSE,
 102                      AHIDB_MaxChannels, 4,
 103                     TAG_DONE);
 104   printmode(id);
 105   Printf("A non-realtime mode with 4 channels.\n");
 106
 107   cleanup(0);
 108 }