[alsa-devel] [PATCH - alsa-lib 1/1] Patch for two bugs in snd_pcm_area_silence().

[alsa2 at bushytails.net]

From: furrywolf <alsa2 at bushytails.net>

First, after silencing the buffer 64 bits at a time, any remaining samples
need to be silenced by the following width-specific code.  However, instead
of silencing the end of the buffer, the code instead re-silences the start
of the buffer, leaving the end unsilenced.  To fix this, update the pointer
used by the width-specific code to point to the end of the area just
silenced, instead of leaving it pointing to the start of the buffer.

Second, the code for 24 bit samples can only silence a single sample, as
there's no loop for multiple samples as with other formats.  To fix this,
add a loop similar to the ones used for every other width.

The symptoms of these bugs are random data at the end of every supposedly
silenced buffer with certain format/buffer size combinations, resulting in
pops and noise.

Signed-off-by: furrywolf <alsa2 at bushytails.net>

diff --git a/src/pcm/pcm.c b/src/pcm/pcm.c
index 69d7d66..1753cda 100644
--- a/src/pcm/pcm.c
+++ b/src/pcm/pcm.c
@@ -2955,6 +2955,7 @@ int snd_pcm_area_silence(const snd_pcm_channel_area_t *dst_area, snd_pcm_uframes
 			*dstp++ = silence;
 		if (samples == 0)
 			return 0;
+		dst = (char *)dstp;
 	}
 	dst_step = dst_area->step / 8;
 	switch (width) {
@@ -2996,16 +2997,20 @@ int snd_pcm_area_silence(const snd_pcm_channel_area_t *dst_area, snd_pcm_uframes
 		}
 		break;
 	}
-	case 24:
+	case 24: {
+		while (samples-- > 0) {
 #ifdef SNDRV_LITTLE_ENDIAN
-		*(dst + 0) = silence >> 0;
-		*(dst + 1) = silence >> 8;
-		*(dst + 2) = silence >> 16;
+			*(dst + 0) = silence >> 0;
+			*(dst + 1) = silence >> 8;
+			*(dst + 2) = silence >> 16;
 #else
-		*(dst + 2) = silence >> 0;
-		*(dst + 1) = silence >> 8;
-		*(dst + 0) = silence >> 16;
+			*(dst + 2) = silence >> 0;
+			*(dst + 1) = silence >> 8;
+			*(dst + 0) = silence >> 16;
 #endif
+			dst += dst_step;
+		}
+	}
 		break;
 	case 32: {
 		uint32_t sil = silence;
-- 
1.7.10.4