vcs.maemo.org Git - drnoksnes/blob - platform/sdla.cpp

   1 #include <SDL.h>
   2
   3 #include "platform.h"
   4 #include "snes9x.h"
   5 #include "soundux.h"
   6
   7 #define DIE(format, ...) do { \
   8                 fprintf(stderr, "Died at %s:%d: ", __FILE__, __LINE__ ); \
   9                 fprintf(stderr, format "\n", ## __VA_ARGS__); \
  10                 abort(); \
  11         } while (0);
  12
  13
  14 static SDL_AudioSpec spec;
  15
  16 static void audioCallback(void *userdata, Uint8 *stream, int len)
  17 {
  18         int samplecount = len / 2; // 16 bit audio
  19         S9xMixSamples((short*)stream, samplecount);
  20 }
  21
  22 void S9xInitAudioOutput()
  23 {
  24         if (!Config.enableAudio) goto no_audio;
  25
  26         if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0)
  27                 DIE("SDL_InitSubSystem(AUDIO): %s", SDL_GetError());
  28
  29         SDL_AudioSpec desired;
  30         desired.freq = Settings.SoundPlaybackRate;
  31         desired.format = AUDIO_S16LSB;
  32         desired.channels = Settings.Stereo ? 2 : 1;
  33         desired.samples = Settings.SoundBufferSize;
  34         desired.callback = audioCallback;
  35         desired.userdata = 0;
  36
  37         if (SDL_OpenAudio(&desired, &spec) < 0) {
  38                 fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());
  39                 goto no_audio_free;
  40         }
  41
  42         Settings.APUEnabled = TRUE;
  43         Settings.SoundPlaybackRate = spec.freq;
  44         if (spec.format == AUDIO_S16LSB) {
  45                 Settings.SixteenBitSound = TRUE;
  46         } else if (spec.format == AUDIO_S8) {
  47                 Settings.SixteenBitSound = FALSE;
  48                 fprintf(stderr, "Cannot output 8 bit sound\n");
  49                 goto no_audio_free;
  50         } else {
  51                 fprintf(stderr, "Invalid audio format\n");
  52                 goto no_audio_free;
  53         }
  54         Settings.Stereo = spec.channels == 2 ? TRUE : FALSE;
  55
  56         printf("Audio: %d Hz, %d %s, %s, %u samples in buffer\n", spec.freq,
  57                 spec.channels, Settings.Stereo ? "channels" : "channel",
  58                 Settings.SixteenBitSound ? "16 bits" : "8 bits",
  59                 spec.samples);
  60
  61         return;
  62
  63 no_audio_free:
  64         SDL_QuitSubSystem(SDL_INIT_AUDIO);
  65         /* Fall through */
  66 no_audio:
  67         Config.enableAudio = false;
  68         Settings.APUEnabled = FALSE;
  69         printf("Audio: no audio\n");
  70
  71         return;
  72 }
  73
  74 void S9xDeinitAudioOutput()
  75 {
  76         if (!Config.enableAudio) return;
  77         SDL_CloseAudio();
  78         SDL_QuitSubSystem(SDL_INIT_AUDIO);
  79 }
  80
  81 void S9xAudioOutputEnable(bool enable)
  82 {
  83         if (!Config.enableAudio) return;
  84         if (enable)     {
  85                 CPU.APU_APUExecuting = Settings.APUEnabled = TRUE;
  86                 so.stereo = Settings.Stereo;
  87                 so.playback_rate = Settings.SoundPlaybackRate;
  88                 S9xSetPlaybackRate(so.playback_rate);
  89                 S9xSetSoundMute(FALSE);
  90                 SDL_PauseAudio(FALSE);
  91         } else {
  92                 S9xSetSoundMute(TRUE);
  93                 SDL_PauseAudio(TRUE);
  94         }
  95 }
  96