diff mbox series

[1/2] ALSA: emu10k1: fix synthesizer sample playback position and caching

Message ID 20230518140339.3722308-1-oswald.buddenhagen@gmx.de (mailing list archive)
State New, archived
Headers show
Series [1/2] ALSA: emu10k1: fix synthesizer sample playback position and caching | expand

Commit Message

Oswald Buddenhagen May 18, 2023, 2:03 p.m. UTC
Compensate for the cache delay, and actually populate the cache.
Without these, the playback would start with garbage (which would be
(mostly?) masqueraded by the attack phase).

Unlike for the PCM voices, this doesn't try to compensate for the
interpolator read-ahead, because it's pointless to be super-exact here.

Note that this code is probably still broken for particularly short
samples, because we ignore the loop-related parts of CCR. But I'm not
going to reverse-engineer that now ...

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
---
 sound/pci/emu10k1/emu10k1_callback.c | 36 ++++------------------------
 1 file changed, 5 insertions(+), 31 deletions(-)

Comments

Takashi Iwai May 18, 2023, 2:57 p.m. UTC | #1
On Thu, 18 May 2023 16:03:38 +0200,
Oswald Buddenhagen wrote:
> 
> Compensate for the cache delay, and actually populate the cache.
> Without these, the playback would start with garbage (which would be
> (mostly?) masqueraded by the attack phase).
> 
> Unlike for the PCM voices, this doesn't try to compensate for the
> interpolator read-ahead, because it's pointless to be super-exact here.
> 
> Note that this code is probably still broken for particularly short
> samples, because we ignore the loop-related parts of CCR. But I'm not
> going to reverse-engineer that now ...
> 
> Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>

Applied both patches now.  Thanks.


Takashi
diff mbox series

Patch

diff --git a/sound/pci/emu10k1/emu10k1_callback.c b/sound/pci/emu10k1/emu10k1_callback.c
index 06440b97b5d7..aab8d64fd708 100644
--- a/sound/pci/emu10k1/emu10k1_callback.c
+++ b/sound/pci/emu10k1/emu10k1_callback.c
@@ -253,7 +253,7 @@  lookup_voices(struct snd_emux *emu, struct snd_emu10k1 *hw,
 		/* check if sample is finished playing (non-looping only) */
 		if (bp != best + V_OFF && bp != best + V_FREE &&
 		    (vp->reg.sample_mode & SNDRV_SFNT_SAMPLE_SINGLESHOT)) {
-			val = snd_emu10k1_ptr_read(hw, CCCA_CURRADDR, vp->ch);
+			val = snd_emu10k1_ptr_read(hw, CCCA_CURRADDR, vp->ch) - 64;
 			if (val >= vp->reg.loopstart)
 				bp = best + V_OFF;
 		}
@@ -360,7 +360,7 @@  start_voice(struct snd_emux_voice *vp)
 
 	map = (hw->silent_page.addr << hw->address_mode) | (hw->address_mode ? MAP_PTI_MASK1 : MAP_PTI_MASK0);
 
-	addr = vp->reg.start;
+	addr = vp->reg.start + 64;
 	temp = vp->reg.parm.filterQ;
 	ccca = (temp << 28) | addr;
 	if (vp->apitch < 0xe400)
@@ -428,40 +428,14 @@  start_voice(struct snd_emux_voice *vp)
 		/* Q & current address (Q 4bit value, MSB) */
 		CCCA, ccca,
 
+		/* cache */
+		CCR, REG_VAL_PUT(CCR_CACHEINVALIDSIZE, 64),
+
 		/* reset volume */
 		VTFT, vtarget | vp->ftarget,
 		CVCF, vtarget | CVCF_CURRENTFILTER_MASK,
 
 		REGLIST_END);
-#if 0
-	/* cache */
-	{
-		unsigned int val, sample;
-		val = 32;
-		if (vp->reg.sample_mode & SNDRV_SFNT_SAMPLE_8BITS)
-			sample = 0x80808080;
-		else {
-			sample = 0;
-			val *= 2;
-		}
-
-		/* cache */
-		snd_emu10k1_ptr_write(hw, CCR, ch, 0x1c << 16);
-		snd_emu10k1_ptr_write(hw, CDE, ch, sample);
-		snd_emu10k1_ptr_write(hw, CDF, ch, sample);
-
-		/* invalidate maps */
-		temp = ((unsigned int)hw->silent_page.addr << hw_address_mode) | (hw->address_mode ? MAP_PTI_MASK1 : MAP_PTI_MASK0);
-		snd_emu10k1_ptr_write(hw, MAPA, ch, temp);
-		snd_emu10k1_ptr_write(hw, MAPB, ch, temp);
-		
-		/* fill cache */
-		val -= 4;
-		val <<= 25;
-		val |= 0x1c << 16;
-		snd_emu10k1_ptr_write(hw, CCR, ch, val);
-	}
-#endif
 
 	return 0;
 }