From: Jaroslav Kysela <perex@suse.cz>
Date: Tue, 31 May 2005 14:59:39 +0000 (+0200)
Subject: [ALSA] OSS PCM emulation - The 2nd final fix for SNDCTL_DSP_GETOPTR problem
X-Git-Tag: firefly_0821_release~42766^2~184
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5ac0fab95c09497bed24640eb3f09893127d6d65;p=firefly-linux-kernel-4.4.55.git

[ALSA] OSS PCM emulation - The 2nd final fix for SNDCTL_DSP_GETOPTR problem

ALSA<-OSS emulation
The problem was negative/wrong result (info.bytes) in a specific condition at
playback startup.

Signed-off-by: Jaroslav Kysela <perex@suse.cz>
---

diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index 203470df5857..cab30977e7c0 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -1537,13 +1537,13 @@ static int snd_pcm_oss_get_ptr(snd_pcm_oss_file_t *pcm_oss_file, int stream, str
 			snd_pcm_oss_simulate_fill(substream, delay);
 		info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
 	} else {
-		delay = snd_pcm_oss_bytes(substream, delay) + fixup;
-		info.blocks = delay / runtime->oss.period_bytes;
+		delay = snd_pcm_oss_bytes(substream, delay);
 		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
-			if (runtime->oss.bytes == 0)
-				delay = 0;
+			info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
 			info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
 		} else {
+			delay += fixup;
+			info.blocks = delay / runtime->oss.period_bytes;
 			info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
 		}
 	}