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Very WIP PCM sound support

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stevenhowes
2021-05-16 20:04:09 +01:00
parent 3d69e6d38e
commit bcc7a72ae1
10 changed files with 123 additions and 2 deletions
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!TheEsc/c/Sound
+35
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@@ -13,6 +13,8 @@ int composition_startcent = -1;
struct CompositionElement composition[COMPOSITION_MAX];
unsigned char audiobuffer[20000];
char *notes[] = {"AX","A#","BX","CX","C#","DX","D#","EX","FX","F#","GX","G#"};
void sound_on()
@@ -195,3 +197,36 @@ int sound_composition_incomplete()
else
return 1;
}
void sound_pcm_loadsample(char* filename)
{
int length;
memset(audiobuffer,0x00,20000);
// Attempt to get file info
inreg.r[0] = 5;
inreg.r[1] = (int) filename;
_kernel_swi(OS_File,&inreg,&outreg);
// Length will be in R4 if it exists
length = outreg.r[4];
if(length > sizeof(audiobuffer))
{
screen_nobuffer();
while (1)
printf("Sample exceeds %d bytes (%d bytes) object type is %d\n",sizeof(audiobuffer),length,outreg.r[0]);
}
// Attempt to get file info
inreg.r[0] = 16;
inreg.r[1] = (int) filename;
inreg.r[2] = (int) audiobuffer;
inreg.r[3] = 0;
_kernel_swi(OS_File,&inreg,&outreg);
// Fill remainder of array with final byte
memset(audiobuffer + length,audiobuffer[length-1],sizeof(audiobuffer)-length);
}