make OSS detect blocking, adjust audio API

git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@898 be3aeb3a-fb24-0410-a615-afba39da0efa

common/emu.c

@@ -1350,6 +1350,26 @@ static void mkdir_path(char *path_with_reserve, int pos, const char *name)
 		lprintf("failed to create: %s\n", path_with_reserve);
 }
 
+void emu_cmn_forced_frame(int no_scale, int do_emu)
+{
+	int po_old = PicoOpt;
+
+	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);
+
+	PicoOpt |= POPT_ACC_SPRITES;
+	if (!no_scale)
+		PicoOpt |= POPT_EN_SOFTSCALE;
+
+	PicoDrawSetOutFormat(PDF_RGB555, 1);
+	Pico.m.dirtyPal = 1;
+	if (do_emu)
+		PicoFrame();
+	else
+		PicoFrameDrawOnly();
+
+	PicoOpt = po_old;
+}
+
 void emu_init(void)
 {
 	char path[512];

common/emu.h

@@ -146,6 +146,9 @@ void  emu_get_game_name(char *str150);
 void  emu_set_fastforward(int set_on);
 void  emu_status_msg(const char *format, ...);
 
+/* used by some (but not all) platforms */
+void  emu_cmn_forced_frame(int no_scale, int do_emu);
+
 #ifdef __cplusplus
 } // extern "C"
 #endif

gp2x/emu.c

@@ -710,18 +710,13 @@ void plat_update_volume(int has_changed, int is_up)
 	}
 }
 
-static void updateSound(int len)
+static void oss_write_nonblocking(int len)
 {
-	len <<= 1;
+	// sndout_oss_can_write() is not reliable, only use with no_frmlimit
-	if (PicoOpt & POPT_EN_STEREO)
-		len <<= 1;
-
 	if ((currentConfig.EmuOpt & EOPT_NO_FRMLIMIT) && !sndout_oss_can_write(len))
 		return;
 
-	/* avoid writing audio when lagging behind to prevent audio lag */
+	sndout_oss_write_nb(PsndOut, len);
-	if (PicoSkipFrame != 2)
-		sndout_oss_write(PsndOut, len);
 }
 
 void pemu_sound_start(void)
@@ -739,7 +734,7 @@ void pemu_sound_start(void)
 
 		memset(sndBuffer, 0, sizeof(sndBuffer));
 		PsndOut = sndBuffer;
-		PicoWriteSound = updateSound;
+		PicoWriteSound = oss_write_nonblocking;
 		plat_update_volume(0, 0);
 
 		printf("starting audio: %i len: %i stereo: %i, pal: %i\n",
@@ -786,30 +781,16 @@ void pemu_sound_wait(void)
 
 void pemu_forced_frame(int no_scale, int do_emu)
 {
-	int po_old = PicoOpt;
+	doing_bg_frame = 1;
-
-	PicoOpt &= ~POPT_ALT_RENDERER;
-	PicoOpt |= POPT_ACC_SPRITES;
-	if (!no_scale)
-		PicoOpt |= POPT_EN_SOFTSCALE;
-
-	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);
-
-	PicoDrawSetOutFormat(PDF_RGB555, 1);
 	PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);
 	PicoDraw32xSetFrameMode(0, 0);
 	PicoDrawSetCallbacks(NULL, NULL);
 	Pico.m.dirtyPal = 1;
 
-	doing_bg_frame = 1;
+	emu_cmn_forced_frame(no_scale, do_emu);
-	if (do_emu)
-		PicoFrame();
-	else
-		PicoFrameDrawOnly();
-	doing_bg_frame = 0;
 
 	g_menubg_src_ptr = g_screen_ptr;
-	PicoOpt = po_old;
+	doing_bg_frame = 0;
 }
 
 void plat_debug_cat(char *str)

linux/emu.c

@@ -210,47 +210,27 @@ void plat_update_volume(int has_changed, int is_up)
 
 void pemu_forced_frame(int no_scale, int do_emu)
 {
-	int po_old = PicoOpt;
-
-	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);
-
-	PicoOpt &= ~POPT_ALT_RENDERER;
-	PicoOpt |= POPT_ACC_SPRITES;
-	if (!no_scale)
-		PicoOpt |= POPT_EN_SOFTSCALE;
-
-	PicoDrawSetOutFormat(PDF_RGB555, 1);
 	PicoDrawSetOutBuf(g_screen_ptr, g_screen_width * 2);
 	PicoDraw32xSetFrameMode(0, 0);
-
+	PicoDrawSetCallbacks(NULL, NULL);
 	Pico.m.dirtyPal = 1;
-	if (do_emu)
+
-		PicoFrame();
+	emu_cmn_forced_frame(no_scale, do_emu);
-	else
-		PicoFrameDrawOnly();
 
 	g_menubg_src_ptr = g_screen_ptr;
-	PicoOpt = po_old;
 }
 
-static void updateSound(int len)
+static void oss_write_nonblocking(int len)
 {
-	len <<= 1;
+	// sndout_oss_can_write() is not reliable, only use with no_frmlimit
-	if (PicoOpt & POPT_EN_STEREO)
-		len <<= 1;
-
 	if ((currentConfig.EmuOpt & EOPT_NO_FRMLIMIT) && !sndout_oss_can_write(len))
 		return;
 
-	/* avoid writing audio when lagging behind to prevent audio lag */
+	sndout_oss_write_nb(PsndOut, len);
-	if (PicoSkipFrame != 2)
-		sndout_oss_write(PsndOut, len);
 }
 
 void pemu_sound_start(void)
 {
-	int target_fps = Pico.m.pal ? 50 : 60;
-
 	PsndOut = NULL;
 
 	if (currentConfig.EmuOpt & EOPT_EN_SOUND)
@@ -263,7 +243,7 @@ void pemu_sound_start(void)
 			PsndRate, PsndLen, is_stereo, Pico.m.pal);
 		sndout_oss_start(PsndRate, is_stereo, 1);
 		sndout_oss_setvol(currentConfig.volume, currentConfig.volume);
-		PicoWriteSound = updateSound;
+		PicoWriteSound = oss_write_nonblocking;
 		plat_update_volume(0, 0);
 		memset(sndBuffer, 0, sizeof(sndBuffer));
 		PsndOut = sndBuffer;

linux/sndout_oss.c

@@ -98,6 +98,42 @@ int sndout_oss_write(const void *buff, int len)
 	return write(sounddev, buff, len);
 }
 
+#include "../common/plat.h"
+
+/* not really non-blocking, just detects if blocking occurs
+ * and starts skipping writes in case it does. */
+int sndout_oss_write_nb(const void *buff, int len)
+{
+	static int lag_counter, skip_counter;
+	unsigned int t;
+	int ret;
+
+	if (lag_counter > 2) {
+		// skip writes if audio starts blocking
+		lag_counter = 0;
+		skip_counter = FRAG_COUNT;
+	}
+
+	if (skip_counter > 0) {
+		skip_counter--;
+		return len;
+	}
+
+	t = plat_get_ticks_ms();
+	ret = sndout_oss_write(buff, len);
+	t = plat_get_ticks_ms() - t;
+	if (t > 1) {
+		// this shouldn't really happen, most likely audio is out of sync
+		lag_counter++;
+		if (lag_counter > 2)
+			printf("audio lag %u\n", t);
+	}
+	else
+		lag_counter = 0;
+
+	return ret;
+}
+
 int sndout_oss_can_write(int bytes)
 {
 	audio_buf_info bi;

linux/sndout_oss.h

@@ -2,6 +2,7 @@ int  sndout_oss_init(void);
 int  sndout_oss_start(int rate, int stereo, int frames_in_frag);
 void sndout_oss_stop(void);
 int  sndout_oss_write(const void *buff, int len);
+int  sndout_oss_write_nb(const void *buff, int len);
 int  sndout_oss_can_write(int bytes);
 void sndout_oss_sync(void);
 void sndout_oss_setvol(int l, int r);

pandora/plat.c

@@ -240,51 +240,22 @@ static void make_bg(int no_scale)
 
 void pemu_forced_frame(int no_scale, int do_emu)
 {
-	int po_old = PicoOpt;
-
-	memset32(g_screen_ptr, 0, g_screen_width * g_screen_height * 2 / 4);
-
-	PicoOpt |= POPT_ACC_SPRITES;
-	if (!no_scale)
-		PicoOpt |= POPT_EN_SOFTSCALE;
-
-	PicoDrawSetOutFormat(PDF_RGB555, 1);
-	Pico.m.dirtyPal = 1;
 	doing_bg_frame = 1;
-	if (do_emu)
+	emu_cmn_forced_frame(no_scale, do_emu);
-		PicoFrame();
-	else
-		PicoFrameDrawOnly();
 	doing_bg_frame = 0;
 
 	// making a copy because enabling the layer clears it's mem
 	memcpy32((void *)fb_copy, g_screen_ptr, sizeof(fb_copy) / 4);
 	make_bg(no_scale);
-
-	PicoOpt = po_old;
 }
 
-static void updateSound(int len)
+static void oss_write_nonblocking(int len)
 {
-	unsigned int t;
+	// sndout_oss_can_write() is not reliable, only use with no_frmlimit
-
-	len <<= 1;
-	if (PicoOpt & POPT_EN_STEREO)
-		len <<= 1;
-
-	// sndout_oss_can_write() not reliable..
 	if ((currentConfig.EmuOpt & EOPT_NO_FRMLIMIT) && !sndout_oss_can_write(len))
 		return;
 
-	/* avoid writing audio when lagging behind to prevent audio lag */
+	sndout_oss_write_nb(PsndOut, len);
-	if (PicoSkipFrame == 2)
-		return;
-
-	t = plat_get_ticks_ms();
-	sndout_oss_write(PsndOut, len);
-	t = plat_get_ticks_ms() - t;
-	if (t > 1)
-		printf("audio lag %u\n", t);
 }
 
 void pemu_sound_start(void)
@@ -308,7 +279,7 @@ void pemu_sound_start(void)
 			PsndRate, PsndLen, is_stereo, Pico.m.pal);
 		sndout_oss_start(PsndRate, is_stereo, 2);
 		//sndout_oss_setvol(currentConfig.volume, currentConfig.volume);
-		PicoWriteSound = updateSound;
+		PicoWriteSound = oss_write_nonblocking;
 		plat_update_volume(0, 0);
 		memset(sndBuffer, 0, sizeof(sndBuffer));
 		PsndOut = sndBuffer;

psp/emu.c

@@ -637,9 +637,8 @@ static void sound_deinit(void)
 static void writeSound(int len)
 {
 	int ret;
-	if (PicoOpt&8) len<<=1;
 
-	PsndOut += len;
+	PsndOut += len / 2;
 	/*if (PsndOut > sndBuffer_endptr) {
 		memcpy32((int *)(void *)sndBuffer, (int *)endptr, (PsndOut - endptr + 1) / 2);
 		PsndOut = &sndBuffer[PsndOut - endptr];
@@ -651,7 +650,7 @@ static void writeSound(int len)
 		PsndOut = sndBuffer;
 
 	// signal the snd thread
-	samples_made += len;
+	samples_made += len / 2;
 	if (samples_made - samples_done > samples_block*2) {
 		// lprintf("signal, %i/%i\n", samples_done, samples_made);
 		ret = sceKernelSignalSema(sound_sem, 1);