X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=platform%2Fgp2x%2Fcode940%2F940.c;h=90087a3e2fae583e21f485f8ffc5b450abec3713;hb=16b0afd0294a8acde173e2973f9a35eafe0bd185;hp=b242603ba52dae21bf1e4d1ff6a05d786a04d0fc;hpb=abe0ea43b561e2def84cf921b1d6d8c82819ea69;p=picodrive.git

diff --git a/platform/gp2x/code940/940.c b/platform/gp2x/code940/940.c
index b242603..90087a3 100644
--- a/platform/gp2x/code940/940.c
+++ b/platform/gp2x/code940/940.c
@@ -1,8 +1,11 @@
+// The top-level functions for the ARM940
+// (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas
+
 #include "940shared.h"
 
 static _940_data_t *shared_data = (_940_data_t *)   0x00100000;
 static _940_ctl_t  *shared_ctl  = (_940_ctl_t *)    0x00200000;
-static unsigned char *mp3_data  = (unsigned char *) 0x01000000;
+static unsigned char *mp3_data  = (unsigned char *) 0x00400000;
 YM2612 *ym2612_940;
 
 // from init.s
@@ -15,22 +18,51 @@ void drain_wb(void);
 // is changed by other core just before we update it
 void set_if_not_changed(int *val, int oldval, int newval);
 
+void _memcpy(void *dst, const void *src, int count);
+
 //	asm volatile ("mov r0, #0" ::: "r0");
 //	asm volatile ("mcr p15, 0, r0, c7, c6,  0" ::: "r0"); /* flush dcache */
 //	asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */
 
 
+static int find_sync_word(unsigned char *buf, int nBytes)
+{
+	unsigned char *p, *pe;
+
+	/* find byte-aligned syncword - need 12 (MPEG 1,2) or 11 (MPEG 2.5) matching bits */
+	for (p = buf, pe = buf + nBytes - 4; p < pe; p++)
+	{
+		int pn;
+		if (p[0] != 0xff) continue;
+		pn = p[1];
+		if ((pn & 0xf8) != 0xf8 || // currently must be MPEG1
+		    (pn & 6) == 0) {       // invalid layer
+			p++; continue;
+		}
+		pn = p[2];
+		if ((pn & 0xf0) < 0x20 || (pn & 0xf0) == 0xf0 || // bitrates
+		    (pn & 0x0c) != 0) { // not 44kHz
+			continue;
+		}
+
+		return p - buf;
+	}
+
+	return -1;
+}
+
 static void mp3_decode(void)
 {
 	int mp3_offs = shared_ctl->mp3_offs;
 	unsigned char *readPtr = mp3_data + mp3_offs;
 	int bytesLeft = shared_ctl->mp3_len - mp3_offs;
 	int offset; // frame offset from readPtr
-	int err;
+	int retries = 0, err;
 
 	if (bytesLeft <= 0) return; // EOF, nothing to do
 
-	offset = MP3FindSyncWord(readPtr, bytesLeft);
+retry:
+	offset = find_sync_word(readPtr, bytesLeft);
 	if (offset < 0) {
 		set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);
 		return; // EOF
@@ -48,6 +80,8 @@ static void mp3_decode(void)
 			// ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*
 			// just try to skip the offending frame..
 			readPtr++;
+			bytesLeft--;
+			if (retries++ < 2) goto retry;
 		}
 		shared_ctl->mp3_errors++;
 		shared_ctl->mp3_lasterr = err;
@@ -55,6 +89,77 @@ static void mp3_decode(void)
 	set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, readPtr - mp3_data);
 }
 
+static void ym_flush_writes(void)
+{
+	UINT16 *wbuff;
+	int i;
+
+	if (shared_ctl->writebuffsel == 1) {
+		wbuff = shared_ctl->writebuff1;
+	} else {
+		wbuff = shared_ctl->writebuff0;
+	}
+
+	/* playback all writes */
+	for (i = 2048; i > 0; i--) {
+		UINT16 d = *wbuff++;
+		if (d == 0xffff) break;
+		if (d == 0xfffe) continue;
+		YM2612Write_(d >> 8, d);
+	}
+}
+
+static void ym_update(int *ym_buffer)
+{
+	int i, dw;
+	int two_upds = 0;
+	UINT16 *wbuff;
+
+	if (shared_ctl->writebuffsel == 1) {
+		wbuff = shared_ctl->writebuff1;
+	} else {
+		wbuff = shared_ctl->writebuff0;
+	}
+
+	/* playback all writes */
+	for (i = 2048/2; i > 0; i--) {
+		UINT16 d;
+		dw = *(int *)wbuff;
+		d = dw;
+		wbuff++;
+		if (d == 0xffff) break;
+		if (d == 0xfffe) { two_upds=1; break; }
+		YM2612Write_(d >> 8, d);
+		d = (dw>>16);
+		wbuff++;
+		if (d == 0xffff) break;
+		if (d == 0xfffe) { two_upds=1; break; }
+		YM2612Write_(d >> 8, d);
+	}
+
+	if (two_upds)
+	{
+		int len1 = shared_ctl->length / 2;
+		shared_ctl->ym_active_chs =
+			YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);
+
+		for (i *= 2; i > 0; i--) {
+			UINT16 d = *wbuff++;
+			if (d == 0xffff) break;
+			YM2612Write_(d >> 8, d);
+		}
+
+		ym_buffer += shared_ctl->stereo ? len1*2 : len1;
+		len1 = shared_ctl->length - len1;
+
+		shared_ctl->ym_active_chs =
+			YM2612UpdateOne_(ym_buffer, len1, shared_ctl->stereo, 1);
+	} else {
+		shared_ctl->ym_active_chs =
+			YM2612UpdateOne_(ym_buffer, shared_ctl->length, shared_ctl->stereo, 1);
+	}
+}
+
 
 void Main940(void)
 {
@@ -92,33 +197,32 @@ void Main940(void)
 				YM2612PicoStateLoad_();
 				break;
 
-			case JOB940_YM2612UPDATEONE: {
-				int i, dw, *wbuff;
-				if (shared_ctl->writebuffsel == 1) {
-					wbuff = (int *) shared_ctl->writebuff1;
-				} else {
-					wbuff = (int *) shared_ctl->writebuff0;
-				}
-
-				/* playback all writes */
-				for (i = 2048/2; i > 0; i--) {
-					UINT16 d;
-					dw = *wbuff++;
-					d = dw;
-					if (d == 0xffff) break;
-					YM2612Write_(d >> 8, d);
-					d = (dw>>16);
-					if (d == 0xffff) break;
-					YM2612Write_(d >> 8, d);
-				}
-
-				YM2612UpdateOne_(ym_buffer, shared_ctl->length, shared_ctl->stereo, 1);
+			case JOB940_PICOSTATESAVE2:
+				YM2612PicoStateSave2(0, 0);
+				_memcpy(shared_ctl->writebuff0, ym2612_940->REGS, 0x200);
+				break;
+
+			case JOB940_PICOSTATELOAD2_PREP:
+				ym_flush_writes();
+				break;
+
+			case JOB940_PICOSTATELOAD2:
+				_memcpy(ym2612_940->REGS, shared_ctl->writebuff0, 0x200);
+				YM2612PicoStateLoad2(0, 0);
+				break;
+
+			case JOB940_YM2612UPDATEONE:
+				ym_update(ym_buffer);
 				break;
-			}
 
 			case JOB940_MP3DECODE:
 				mp3_decode();
 				break;
+
+			case JOB940_MP3RESET:
+				if (shared_data->mp3dec) MP3FreeDecoder(shared_data->mp3dec);
+				shared_data->mp3dec = MP3InitDecoder();
+				break;
 		}
 
 		shared_ctl->loopc++;