ALSA: pcm: Fix the silence data for DSD formats

Right now we set 0 as the silence data for DSD_U8 and DSD_U16 formats,
but this is actually wrong.  0 is rather the most negative value.
Alternatively, we may take the repeating 0x69 pattern like ffmpeg
deploys.

Reference: https://ffmpeg.org/pipermail/ffmpeg-cvslog/2014-April/076427.html
Suggested-by: Alexander E. Patrakov <patrakov@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/pcm_misc.c b/sound/core/pcm_misc.c
index 4560ca0e5651ac6c515c589efa18fc8d308b1910..2c6fd80e0bd1fd0042848bdc3e68bd2734c4a0c5 100644 (file)
--- a/sound/core/pcm_misc.c
+++ b/sound/core/pcm_misc.c
@@ -142,11 +142,11 @@ static struct pcm_format_data pcm_formats[(INT)SNDRV_PCM_FORMAT_LAST+1] = {
        },
        [SNDRV_PCM_FORMAT_DSD_U8] = {
                .width = 8, .phys = 8, .le = 1, .signd = 0,
-               .silence = {},
+               .silence = { 0x69 },
        },
        [SNDRV_PCM_FORMAT_DSD_U16_LE] = {
                .width = 16, .phys = 16, .le = 1, .signd = 0,
-               .silence = {},
+               .silence = { 0x69, 0x69 },
        },
        /* FIXME: the following three formats are not defined properly yet */
        [SNDRV_PCM_FORMAT_MPEG] = {