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control: decode HDMI device name from ELD
The HDMI drivers set an uniform PCM names. Use ELD (EDID) to obtain the HDMI device name and send this string to applications for a better user experience. Example (aplay -l): card 1: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2] Subdevices: 1/1 vs improved: card 1: PCH [HDA Intel PCH], device 8: HDMI 2 [Philips 272P4] Subdevices: 1/1 Fixes: #209 Signed-off-by: Jaroslav Kysela <[email protected]>
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/** | ||
* \file control/eld.c | ||
* \brief ELD decoder | ||
* \author Jaroslav Kysela <perex@perex> | ||
* \date 2022 | ||
*/ | ||
/* | ||
* Control Interface - Decode ELD | ||
* | ||
* Copyright (c) 2022 Jaroslav Kysela <[email protected]> | ||
* | ||
* | ||
* This library is free software; you can redistribute it and/or modify | ||
* it under the terms of the GNU Lesser General Public License as | ||
* published by the Free Software Foundation; either version 2.1 of | ||
* the License, or (at your option) any later version. | ||
* | ||
* This program is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU Lesser General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU Lesser General Public | ||
* License along with this library; if not, write to the Free Software | ||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
* | ||
*/ | ||
|
||
#include <stdio.h> | ||
#include <stdlib.h> | ||
#include <unistd.h> | ||
#include <string.h> | ||
#include "control_local.h" | ||
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static void __fill_eld_ctl_id(snd_ctl_elem_id_t *id, int dev, int subdev) | ||
{ | ||
snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_PCM); | ||
snd_ctl_elem_id_set_name(id, "ELD"); | ||
snd_ctl_elem_id_set_device(id, dev); | ||
snd_ctl_elem_id_set_index(id, subdev); | ||
} | ||
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int __snd_pcm_info_eld_fixup(snd_pcm_info_t * info) | ||
{ | ||
snd_ctl_t *ctl; | ||
snd_ctl_elem_info_t cinfo = {0}; | ||
snd_ctl_elem_value_t value = {0}; | ||
unsigned char *eld; | ||
unsigned int l; | ||
char *s, c; | ||
int ret, valid; | ||
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ret = snd_ctl_hw_open(&ctl, NULL, info->card, 0); | ||
if (ret < 0) { | ||
SYSMSG("Cannot open the associated CTL\n"); | ||
return ret; | ||
} | ||
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__fill_eld_ctl_id(&cinfo.id, info->device, info->subdevice); | ||
value.id = cinfo.id; | ||
ret = snd_ctl_elem_info(ctl, &cinfo); | ||
if (ret >= 0 && cinfo.type == SND_CTL_ELEM_TYPE_BYTES) | ||
ret = snd_ctl_elem_read(ctl, &value); | ||
snd_ctl_close(ctl); | ||
if (ret == -ENOENT || cinfo.type != SND_CTL_ELEM_TYPE_BYTES || cinfo.count == 0) | ||
return 0; | ||
if (ret < 0) { | ||
SYSMSG("Cannot read ELD\n"); | ||
return ret; | ||
} | ||
/* decode connected HDMI device name */ | ||
eld = value.value.bytes.data; | ||
if (cinfo.count < 20 || cinfo.count > 256) | ||
return -EIO; | ||
l = eld[4] & 0x1f; | ||
if (l == 0 || l > 16 || 20 + l > cinfo.count) | ||
return -EIO; | ||
s = alloca(l + 1); | ||
s[l] = '\0'; | ||
/* sanitize */ | ||
valid = 0; | ||
while (l > 0) { | ||
l--; | ||
c = eld[20 + l]; | ||
if (c < ' ' || c >= 0x7f) { | ||
s[l] = ' '; | ||
} else { | ||
valid += !!isalnum(c); | ||
s[l] = c; | ||
} | ||
} | ||
if (valid > 3) | ||
snd_strlcpy((char *)info->name, s, sizeof(info->name)); | ||
return 0; | ||
} |
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