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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2019-02-26 13:38:37 +0900 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-02-26 07:11:40 +0100 |
| commit | f97a0944a72b26a2bece72516294e112a890f98a (patch) | |
| tree | ff5aa5f7bd785b85df3c16128320b32af8c8eb63 | |
| parent | 7dc661bd8d3261053b69e4e2d0050cd1ee540fc1 (diff) | |
| download | linux-f97a0944a72b26a2bece72516294e112a890f98a.tar.bz2 | |
ALSA: firewire-motu: fix construction of PCM frame for capture direction
In data blocks of common isochronous packet for MOTU devices, PCM
frames are multiplexed in a shape of '24 bit * 4 Audio Pack', described
in IEC 61883-6. The frames are not aligned to quadlet.
For capture PCM substream, ALSA firewire-motu driver constructs PCM
frames by reading data blocks byte-by-byte. However this operation
includes bug for lower byte of the PCM sample. This brings invalid
content of the PCM samples.
This commit fixes the bug.
Reported-by: Peter Sjöberg <autopeter@gmail.com>
Cc: <stable@vger.kernel.org> # v4.12+
Fixes: 4641c9394010 ("ALSA: firewire-motu: add MOTU specific protocol layer")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | sound/firewire/motu/amdtp-motu.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sound/firewire/motu/amdtp-motu.c b/sound/firewire/motu/amdtp-motu.c index f0555a24d90e..6c9b743ea74b 100644 --- a/sound/firewire/motu/amdtp-motu.c +++ b/sound/firewire/motu/amdtp-motu.c @@ -136,7 +136,9 @@ static void read_pcm_s32(struct amdtp_stream *s, byte = (u8 *)buffer + p->pcm_byte_offset; for (c = 0; c < channels; ++c) { - *dst = (byte[0] << 24) | (byte[1] << 16) | byte[2]; + *dst = (byte[0] << 24) | + (byte[1] << 16) | + (byte[2] << 8); byte += 3; dst++; } |