working audio sync?

[picodrive.git] / platform / gizmondo / emu.c

diff --git a/platform/gizmondo/emu.c b/platform/gizmondo/emu.c
index d8a2247..d404d55 100644 (file)
--- a/platform/gizmondo/emu.c
+++ b/platform/gizmondo/emu.c
@@ -557,7 +557,7 @@ void emu_Loop(void)
                snd_excess_add = ((PsndRate - PsndLen*target_fps)<<16) / target_fps;
                snd_cbuf_samples = (PsndRate<<stereo) * 16 / target_fps;
                lprintf("starting audio: %i len: %i (ex: %04x) stereo: %i, pal: %i\n",
-                       PsndRate, PsndLen, snd_excess_add, (PicoOpt&8)>>3, Pico.m.pal);
+                       PsndRate, PsndLen, snd_excess_add, stereo, Pico.m.pal);
                ret = FrameworkAudio_Init(PsndRate, snd_cbuf_samples, stereo);
                if (ret != 0) {
                        lprintf("FrameworkAudio_Init() failed: %i\n", ret);
@@ -632,11 +632,27 @@ void emu_Loop(void)
 
                        if (PsndOut != NULL)
                        {
-                               int audio_skew, adj;
+                               /* some code which tries to sync things to audio clock, the dirty way */
+                               static int audio_skew_prev = 0;
+                               int audio_skew, adj, co = 9, shift = 7;
                                audio_skew = snd_all_samples*2 - FrameworkAudio_BufferPos();
-                               if (audio_skew < 0)
-                                    adj = -((-audio_skew) >> 10);
-                               else adj = audio_skew >> 10;
+                               if (PsndRate == 22050) co = 10;
+                               if (PsndRate  > 22050) co = 11;
+                               if (PicoOpt&8) shift++;
+                               if (audio_skew < 0) {
+                                       adj = -((-audio_skew) >> shift);
+                                       if (audio_skew > -(6<<co)) adj>>=1;
+                                       if (audio_skew > -(4<<co)) adj>>=1;
+                                       if (audio_skew > -(2<<co)) adj>>=1;
+                                       if (audio_skew > audio_skew_prev) adj>>=2; // going up already
+                               } else {
+                                       adj = audio_skew >> shift;
+                                       if (audio_skew < (6<<co)) adj>>=1;
+                                       if (audio_skew < (4<<co)) adj>>=1;
+                                       if (audio_skew < (2<<co)) adj>>=1;
+                                       if (audio_skew < audio_skew_prev) adj>>=2;
+                               }
+                               audio_skew_prev = audio_skew;
                                target_frametime += adj;
                                sec_ms = (target_frametime * target_fps) >> 8;
                                stdbg("%i %i %i", audio_skew, adj, sec_ms);