From 98f45b33dc7ef602656ce7163dfc7f0b2327fde5 Mon Sep 17 00:00:00 2001
From: David Schmenk <dschmenk@gmail.com>
Date: Fri, 24 Oct 2025 16:41:12 -0700
Subject: [PATCH] Take 2 for PCM playback

---
 src/libsrc/apple/sndseq.pla                |  26 +--
 src/makefile                               |  10 +-
 src/mkrel                                  |   6 +-
 src/mockingboard/bells.pcm                 | 202 +++++++++++++++++++++
 src/mockingboard/hello.wav                 | Bin 5068 -> 14982 bytes
 src/mockingboard/wave2rlepcm.c             |  70 +++++++
 src/samplesrc/{playwav.pla => playpcm.pla} |  34 +++-
 7 files changed, 320 insertions(+), 28 deletions(-)
 create mode 100644 src/mockingboard/bells.pcm
 create mode 100644 src/mockingboard/wave2rlepcm.c
 rename src/samplesrc/{playwav.pla => playpcm.pla} (72%)

diff --git a/src/libsrc/apple/sndseq.pla b/src/libsrc/apple/sndseq.pla
index c5b7207..98e53a0 100755
--- a/src/libsrc/apple/sndseq.pla
+++ b/src/libsrc/apple/sndseq.pla
@@ -315,45 +315,47 @@ TONEXIT PLP
         INX
         RTS
 end
-asm a2spkrPCM(samples, pagecnt)#0
-PWM_DIV =       3
-PWM_DLY =       $100/PWM_DIV
+asm a2spkrPCM(rlepcm, pgcnt)#0
         LDA     ESTKL,X
         STA     TMP
         LDA     ESTKL+1,X
         STA     SRCL
         LDA     ESTKH+1,X
         STA     SRCH
+        STX     ESP
         PHP
         SEI
         LDY     #$00
 PWM_OUT LDA     (SRC),Y     ; 5
-        STA     $C030       ; 4
         LSR                 ; 2
         LSR                 ; 2
         LSR                 ; 2
-        ;LSR                 ; 2
-                            ; 17
+        LSR                 ; 2
+        TAX                 ; 2
+PWM_REP BIT     $C030       ; 4
+        LDA     (SRC),Y     ; 5
+        AND     #$0F        ; 2
 end
 asm pwm_on
         STA     ON_BR+1     ; 4
 ON_BR   BNE     OFF_BR      ; 3
-        !FILL   31, $EA     ; 15 * 2 NOPs
-        EOR     #$1F        ; 2
-        STA     $C030       ; 4
-                            ; 43
+        !FILL   15, $EA     ; 15 * 2 NOPs
+        BIT     $C030       ; 4
+        EOR     #$0F        ; 2
 end
 asm pwm_off
         STA     OFF_BR+1    ; 4
 OFF_BR  BNE     ON_BR       ; 3
-        !FILL   31, $EA     ; 15 * 2 NOPs
+        !FILL   15, $EA     ; 15 * 2 NOPs
+        DEX                 ; 2
+        BPL     PWM_REP     ; 3
         INY                 ; 2
         BNE     PWM_OUT     ; 3
-                            ; 12
         INC     SRCH
         DEC     TMP
         BNE     PWM_OUT
 PCMEX   PLP
+        LDX     ESP
         INX
         INX
         RTS
diff --git a/src/makefile b/src/makefile
index 42e33b0..3372213 100755
--- a/src/makefile
+++ b/src/makefile
@@ -48,7 +48,7 @@ FPSTR      = rel/FPSTR\#FE1000
 FPU        = rel/FPU\#FE1000
 SNDSEQ     = rel/apple/SNDSEQ\#FE1000
 PLAYSEQ    = rel/apple/PLAYSEQ\#FE1000
-PLAYWAV    = rel/apple/PLAYWAV\#FE1000
+PLAYPCM    = rel/apple/PLAYPCM\#FE1000
 SANITY     = rel/SANITY\#FE1000
 RPNCALC    = rel/RPNCALC\#FE1000
 LZ4        = rel/LZ4\#FE1000
@@ -129,7 +129,7 @@ $(HTTPD) $(TFTPD) $(ROGUE) $(ROGUEMAP) $(ROGUECOMBAT) $(SFM) $(SFMSPRT) $(GRAFIX
 $(HGRTILE) $(HGRFONT) $(HGRSPRITE) $(HGRLIB) $(TILETEST) $(HGRTEST) $(GRLIB) $(DGRLIB) $(VBLANK) \
 $(GRTEST) $(DGRTEST) $(HGRTEST) $(FILEIO_APL) $(CONIO_APL) $(JOYBUZZ) $(PORTIO) $(SPIPORT) \
 $(SDFAT) $(FATCAT) $(FATGET) $(FATPUT) $(FATWDSK) $(FATRDSK) $(INT32) $(INT32TEST) $(SANE) $(FPSTR) $(FPU) $(SANITY) \
-$(LZ4) $(LZ4CAT) $(RPNCALC) $(SNDSEQ) $(PLAYSEQ) $(PLAYWAV) $(CONIOTEST)
+$(LZ4) $(LZ4CAT) $(RPNCALC) $(SNDSEQ) $(PLAYSEQ) $(PLAYPCM) $(CONIOTEST)
 
 	-rm vmsrc/plvmzp.inc
 
@@ -443,9 +443,9 @@ $(PLAYSEQ): samplesrc/playseq.pla $(PLVM02) $(PLASM)
 	./$(PLASM) -AMOW samplesrc/playseq.pla
 	acme --setpc 4094 -o $(PLAYSEQ) samplesrc/playseq.a
 
-$(PLAYWAV): samplesrc/playwav.pla $(PLVM02) $(PLASM)
-	./$(PLASM) -AMOW samplesrc/playwav.pla
-	acme --setpc 4094 -o $(PLAYWAV) samplesrc/playwav.a
+$(PLAYPCM): samplesrc/playpcm.pla $(PLVM02) $(PLASM)
+	./$(PLASM) -AMOW samplesrc/playpcm.pla
+	acme --setpc 4094 -o $(PLAYPCM) samplesrc/playpcm.a
 
 $(GRAFIX): libsrc/apple/grafix.pla $(PLVM02) $(PLASM)
 	./$(PLASM) -AMOW libsrc/apple/grafix.pla
diff --git a/src/mkrel b/src/mkrel
index 1cd39c5..76a4a02 100755
--- a/src/mkrel
+++ b/src/mkrel
@@ -93,10 +93,10 @@ cp samplesrc/LEVEL1#040000 prodos/demos/rogue/LEVEL1.TXT
 
 mkdir prodos/demos/music
 cp rel/apple/PLAYSEQ#FE1000 prodos/demos/music/PLAYSEQ.REL
-cp rel/apple/PLAYWAV#FE1000 prodos/demos/music/PLAYWAV.REL
+cp rel/apple/PLAYPCM#FE1000 prodos/demos/music/PLAYPCM.REL
 cp mockingboard/ultima3.seq prodos/demos/music/ULTIMA3.SEQ.BIN
 cp mockingboard/startrek.seq prodos/demos/music/STARTREK.SEQ.BIN
-cp mockingboard/hello.wav prodos/demos/music/HELLO.WAV.BIN
+cp mockingboard/bells.pcm prodos/demos/music/BELLS.PCM.BIN
 
 mkdir prodos/demos/net
 cp rel/HTTPD#FE1000 prodos/demos/net/HTTPD.REL
@@ -153,7 +153,7 @@ cp samplesrc/sieve.pla prodos/bld/samples/SIEVE.PLA.TXT
 cp samplesrc/test.pla prodos/bld/samples/TEST.PLA.TXT
 cp samplesrc/testlib.pla prodos/bld/samples/TESTLIB.PLA.TXT
 cp samplesrc/playseq.pla prodos/bld/samples/PLAYSEQ.PLA.TXT
-cp samplesrc/playwav.pla prodos/bld/samples/PLAYWAV.PLA.TXT
+cp samplesrc/playpcm.pla prodos/bld/samples/PLAYPCM.PLA.TXT
 cp samplesrc/rpncalc.pla prodos/bld/samples/RPNCALC.PLA.TXT
 cp samplesrc/fatcat.pla prodos/bld/samples/FATCAT.PLA.TXT
 cp samplesrc/gfxdemo.pla prodos/bld/samples/GFXDEMO.PLA.TXT
diff --git a/src/mockingboard/bells.pcm b/src/mockingboard/bells.pcm
new file mode 100644
index 0000000..530f89f
--- /dev/null
+++ b/src/mockingboard/bells.pcm
@@ -0,0 +1,202 @@
+����G���h��������X����W���(��	H�8iJ[:)(gVw(;
+C$*:)(KG()
+
.
+#*K;L;	Ey�)J	3Z	*	T�G(	
+lYE�():$	
+
/

+	67hUiD(I:)X�
+9�9JGVG&$	l	F	
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+5y7
+

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diff --git a/src/mockingboard/hello.wav b/src/mockingboard/hello.wav
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diff --git a/src/mockingboard/wave2rlepcm.c b/src/mockingboard/wave2rlepcm.c
new file mode 100644
index 0000000..1fc1f24
--- /dev/null
+++ b/src/mockingboard/wave2rlepcm.c
@@ -0,0 +1,70 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define PCM4(p) ((p) < 0xF8 ? (((p) + 8) >> 4) : 0x0F)
+
+int main(int argc, char **argv)
+{
+    FILE *fp;
+    char *wavfile = NULL;
+    char *pcmfile = "out.pcm";
+    unsigned char header[44], *samples, *rlepcm;
+    unsigned int wavlen, pcmlen, prevpcm, pcm, run;
+    int i;
+
+    if (argc > 1)
+    {
+        wavfile = argv[1];
+        if (!(fp = fopen(wavfile, "rb")))
+        {
+            fprintf(stderr, "Ubale to open %s.\n", wavfile);
+            exit(-1);
+        }
+        if (argc > 2)
+            pcmfile = argv[2];
+    }
+    else
+    {
+        fp = stdin;
+    }
+    fread(&header, 44, 1, fp);
+    if (header[0] == 'R' && header[12] == 'f' && header[20] == 1 && header[34] == 8)
+    {
+        wavlen  = (header[40] | (header[41] << 8) | (header[42] << 16) | (header[43] << 24));
+        fprintf(stderr, "WAV length: %d\n", wavlen);
+        samples = malloc(wavlen);
+        rlepcm  = malloc(wavlen);
+        fread(samples, wavlen, 1, fp);
+    }
+    else
+    {
+        fprintf(stderr, "Not 8 bit/samples mono WAV header.\n");
+        exit(-1);
+    }
+    if (wavfile)
+        fclose(fp);
+    if (!(fp = fopen(pcmfile, "wb")))
+    {
+        fprintf(stderr, "Unable to open %s for writing.\n", pcmfile);
+        exit(-1);
+    }
+    prevpcm = PCM4(samples[0]);
+    run     = 1;
+    pcmlen  = 0;
+    for (i = 1; i < wavlen; i++)
+    {
+        pcm = PCM4(samples[i]);
+        if (pcm == prevpcm && run < 16)
+            run++;
+        else
+        {
+            rlepcm[pcmlen++] = ((run - 1) << 4) | prevpcm;
+            prevpcm = pcm;
+            run     = 1;
+        }
+    }
+    fprintf(stderr, "RLE PCM length: %d\n", pcmlen);
+    fwrite(rlepcm, pcmlen, 1, fp);
+    fclose(fp);
+    return 0;
+}
\ No newline at end of file
diff --git a/src/samplesrc/playwav.pla b/src/samplesrc/playpcm.pla
similarity index 72%
rename from src/samplesrc/playwav.pla
rename to src/samplesrc/playpcm.pla
index 063f9cd..b5afc17 100755
--- a/src/samplesrc/playwav.pla
+++ b/src/samplesrc/playpcm.pla
@@ -27,6 +27,15 @@ byte = $09, $0A, $0C, $0D, $0F, $10, $12, $13, $15, $17, $19, $1B, $1D, $1F, $21
 byte = $25, $27, $2A, $2C, $2E, $31, $33, $36, $38, $3B, $3E, $40, $43, $46, $49, $4C
 byte = $4F, $51, $54, $57, $5A, $5D, $60, $63, $67, $6A, $6D, $70, $73, $76, $79, $7C
 
+def wavtopcm4(samples, rep, len)#0
+    var i
+
+    rep = (rep - 1) << 4
+    for i = 0 to len-1
+        samples->[i] = rep | (samples->[i] >> 4)
+    next
+end
+
 arg = argNext(argFirst)
 if ^arg
     ref = fileio:open(arg)
@@ -35,23 +44,32 @@ if ^arg
         len = fileio:read(ref, pcm, heapavail)
         fileio:close(ref)
         heapalloc(len)
-        pcm = pcm + 44
-        len = len - 44
+        if pcm[0] == 'R' and pcm[1] == 'I' and pcm[2] == 'F'
+            pcm = pcm + 44
+            len = len - 44
+            wavtopcm4(pcm, 1, len)
+        fin
         pcmPlay(pcm, len / 256)#0
     fin
 else
-    while ^$C000 < 128
-        pcmPlay(@sinewave, 1)#0
+    wavtopcm4(@sinewave, 16, 256)
+    memcpy(heapmark, @sinewave, 256)
+    memcpy(heapmark + 256, @sinewave, 256)
+    memcpy(heapmark + 512, @sinewave, 256)
+    memcpy(heapmark + 768, @sinewave, 256)
+    memcpy(heapmark + 1024, heapmark, 1024)
+     while ^$C000 < 128
+        pcmPlay(heapmark, 8)#0
     loop
     getc
-    memset(@sinewave, $10F0, 256)
+    memset(heapmark, $FFF0, 1024)
     while ^$C000 < 128
-        pcmPlay(@sinewave, 1)#0
+        pcmPlay(heapmark, 4)#0
     loop
     getc
-    memset(@sinewave, $8080, 256)
+    memset(heapmark, $F8F8, 1024)
     while ^$C000 < 128
-        pcmPlay(@sinewave, 1)#0
+        pcmPlay(heapmark, 4)#0
     loop
     getc
 fin