mirrors/alsa-lib
1
0
Fork 0
mirror of https://github.com/alsa-project/alsa-lib.git synced 2025-10-29 05:40:25 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Move dB parser to mixer abstraction

Browse source 
Moved the parser of dB value to mixer abstraction from hcontrol layer.
Also, cleaned up codes.
This commit is contained in:
Takashi Iwai 2006-07-28 14:36:37 +02:00
parent 8f7152b633
commit ae76129999
3 changed files with 126 additions and 126 deletions
Download patch file Download diff file Expand all files Collapse all files

111
src/control/hcontrol.c
View file

@ -239,6 +239,7 @@ static int get_compare_weight(const snd_ctl_elem_id_t *id)
"Tone Control",
"3D Control",
"PCM",
"Front",
"Surround",
"Center",
"LFE",
@ -787,116 +788,6 @@ int snd_hctl_handle_events(snd_hctl_t *hctl)
return count;
}
static int snd_hctl_elem_decode_tlv_db_gain(unsigned int *tlv, unsigned int tlv_size, long volume, long *db_gain)
{
unsigned int type;
unsigned int size;
unsigned int idx = 0;
int err = 0;
type = tlv[idx++];
size = tlv[idx++];
tlv_size -= 2 * sizeof(unsigned int);
if (size > tlv_size) {
err = -EINVAL;
goto __exit_decode_db_gain;
}
switch (type) {
case SND_CTL_TLVT_CONTAINER:
size += sizeof(unsigned int) - 1;
size /= sizeof(unsigned int);
while (idx < size) {
if (tlv[idx+1] > (size - idx) * sizeof(unsigned int)) {
err = -EINVAL;
goto __exit_decode_db_gain;
}
err = snd_hctl_elem_decode_tlv_db_gain(tlv + idx, tlv[idx+1], volume, db_gain);
if (!err)
break; /* db_gain obtained */
idx += 2 + (tlv[1] + sizeof(unsigned int) - 1) / sizeof(unsigned int);
}
break;
case SND_CTL_TLVT_DB_SCALE:
if (size != 2 * sizeof(unsigned int)) {
#if 0
while (size > 0) {
printf("0x%x", tlv[idx++]);
size -= sizeof(unsigned int);
}
printf("\n");
#endif
} else {
int min,step,mute;
min = tlv[2];
step = (tlv[3] & 0xffff);
mute = (tlv[3] >> 16) & 1;
*db_gain = (volume * step) + min;
if (mute && (volume == 0))
*db_gain = -9999999;
}
break;
default:
#if 0
printf("unk-%i-", type);
while (size > 0) {
printf("0x%x", tlv[idx++]);
size -= sizeof(unsigned int);
}
printf("\n");
#endif
break;
}
__exit_decode_db_gain:
return err;
}
/**
* \brief Get db_gain information for an HCTL element
* \param elem HCTL element
* \param volume The current control volume
* \param db_gain The return value in db_gain scale
* \return 0 otherwise a negative error code on failure
*/
int snd_hctl_elem_get_db_gain(snd_hctl_elem_t *elem, long volume, long *db_gain)
{
snd_ctl_elem_info_t *info;
unsigned int *tlv;
unsigned int tlv_size = 4096;
int err;
snd_ctl_elem_info_alloca(&info);
err = snd_hctl_elem_info(elem, info);
if (err < 0)
return err;
if (tlv_size < 2 * sizeof(unsigned int)) {
err = -EINVAL;
goto __exit_db_gain;
}
if (!snd_ctl_elem_info_is_tlv_readable(info)) {
err = -EINVAL;
goto __exit_db_gain;
}
tlv = malloc(tlv_size);
if (tlv == NULL) {
err = -ENOMEM;
goto __exit_db_gain;
}
if ((err = snd_hctl_elem_tlv_read(elem, tlv, tlv_size)) < 0)
goto __free_exit_db_gain;
err = snd_hctl_elem_decode_tlv_db_gain(tlv, tlv_size, volume, db_gain);
__free_exit_db_gain:
free(tlv);
__exit_db_gain:
return err;
}
/**
* \brief Get information for an HCTL element
* \param elem HCTL element