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PCM sound, refactored code940

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@27 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-02-04 17:15:31 +00:00
parent 98c9d8d9e7
commit 49fe50f04c
10 changed files with 150 additions and 168 deletions
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60
linux/940ctl_ym2612.c
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@ -20,8 +20,6 @@
static YM2612 ym2612;
YM2612 *ym2612_940 = &ym2612;
int mix_buffer_[44100/50*2]; /* this is where the YM2612 samples will be mixed to */
int *mix_buffer = mix_buffer_;
// static _940_data_t shared_data_;
static _940_ctl_t shared_ctl_;
@ -96,58 +94,6 @@ void YM2612ResetChip_940(void)
}
static void mix_samples(short *dest_buf, int *ym_buf, short *mp3_buf, int len, int stereo)
{
if (mp3_buf)
{
if (stereo)
{
for (; len > 0; len--)
{
int l, r;
l = r = *dest_buf;
l += *ym_buf++; r += *ym_buf++;
l += *mp3_buf++; r += *mp3_buf++;
Limit( l, MAXOUT, MINOUT );
Limit( r, MAXOUT, MINOUT );
*dest_buf++ = l; *dest_buf++ = r;
}
} else {
for (; len > 0; len--)
{
int l = *ym_buf++;
l += *dest_buf;
l += *mp3_buf++;
Limit( l, MAXOUT, MINOUT );
*dest_buf++ = l;
}
}
}
else
{
if (stereo)
{
for (; len > 0; len--)
{
int l, r;
l = r = *dest_buf;
l += *ym_buf++, r += *ym_buf++;
Limit( l, MAXOUT, MINOUT );
Limit( r, MAXOUT, MINOUT );
*dest_buf++ = l; *dest_buf++ = r;
}
} else {
for (; len > 0; len--)
{
int l = *ym_buf++;
l += *dest_buf;
Limit( l, MAXOUT, MINOUT );
*dest_buf++ = l;
}
}
}
}
#if 0
static void local_decode(void)
{
@ -190,7 +136,7 @@ static void local_decode(void)
static FILE *loaded_mp3 = 0;
void YM2612UpdateOne_940(short *buffer, int length, int stereo)
int YM2612UpdateOne_940(int *buffer, int length, int stereo, int is_buf_empty)
{
#if 0
int cdda_on, *ym_buffer = mix_buffer;
@ -233,9 +179,7 @@ void YM2612UpdateOne_940(short *buffer, int length, int stereo)
mp3_samples_ready += 1152;
}
#else
YM2612UpdateOne_(buffer, length, stereo); // really writes to mix_buffer
mix_samples(buffer, mix_buffer, 0, length, stereo);
return YM2612UpdateOne_(buffer, length, stereo, is_buf_empty);
#endif
}