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Code Pull requests 5 Wiki Activity

ALSA: hda - hdmi: Fix reported channel map on common default layouts

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hdmi_setup_fake_chmap() is supposed to set the reported channel map when
the channel map is not specified by the user.

However, the function indexes channel_allocations[] with a wrong value
and extracts the wrong nibble from hdmi_channel_mapping[], causing wrong
channel maps to be shown.

Fix those issues.

Tested on Intel HDMI to correctly generate various channel maps, for
example 3,4,14,15,7,8,5,6 (instead of incorrect 3,4,8,7,5,6,14,0) for
standard 7.1 channel audio. (Note that the side and rear channels are
reported as RL/RR and RLC/RRC, respectively, as per the CEA-861
standard, instead of the more traditional SL/SR and RL/RR.)

Note that this only fixes the layouts that only contain traditional 7.1
speakers (2.0, 2.1, 4.0, 5.1, 7.1, etc.). E.g. the rear center of 6.1
is still being shown wrongly due to an issue with from_cea_slot()
which will be fixed in a later patch.

Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Anssi Hannula 2013-10-05 02:25:38 +03:00 committed by Takashi Iwai
parent 05c79b772f
commit 56cac413dd
1 changed files with 3 additions and 2 deletions
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5
sound/pci/hda/patch_hdmi.c
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@ -740,9 +740,10 @@ static int hdmi_manual_setup_channel_mapping(struct hda_codec *codec,
static void hdmi_setup_fake_chmap(unsigned char *map, int ca)
{
int i;
int ordered_ca = get_channel_allocation_order(ca);
for (i = 0; i < 8; i++) {
if (i < channel_allocations[ca].channels)
map[i] = from_cea_slot((hdmi_channel_mapping[ca][i] >> 4) & 0x0f);
if (i < channel_allocations[ordered_ca].channels)
map[i] = from_cea_slot(hdmi_channel_mapping[ca][i] & 0x0f);
else
map[i] = 0;
}