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Control API - add TLV support

Browse source 
snd_ctl_elem_tlv_read
snd_ctl_elem_tlv_write
snd_ctl_elem_tlv_command
snd_ctl_elem_info_is_tlv_readable
snd_ctl_elem_info_is_tlv_writable
snd_ctl_elem_info_is_tlv_commandable
snd_hctl_elem_tlv_read
snd_hctl_elem_tlv_write
snd_hctl_elem_tlv_command
This commit is contained in:
Jaroslav Kysela 2006-07-05 17:42:16 +02:00
parent 408697bfe2
commit c7a0708a23
7 changed files with 248 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

34
src/control/control_hw.c
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@ -200,6 +200,39 @@ static int snd_ctl_hw_elem_unlock(snd_ctl_t *handle, snd_ctl_elem_id_t *id)
return 0;
}
static int snd_ctl_hw_elem_tlv(snd_ctl_t *handle, int op_flag,
unsigned int numid,
unsigned int *tlv, unsigned int tlv_size)
{
int inum;
snd_ctl_hw_t *hw = handle->private_data;
struct sndrv_ctl_tlv *xtlv;
switch (op_flag) {
case -1: inum = SNDRV_CTL_IOCTL_TLV_COMMAND; break;
case 0: inum = SNDRV_CTL_IOCTL_TLV_READ; break;
case 1: inum = SNDRV_CTL_IOCTL_TLV_WRITE; break;
default: return -EINVAL;
}
xtlv = malloc(sizeof(struct sndrv_ctl_tlv) + tlv_size);
if (xtlv == NULL)
return -ENOMEM;
xtlv->numid = numid;
xtlv->length = tlv_size;
memcpy(xtlv->tlv, tlv, tlv_size);
if (ioctl(hw->fd, inum, xtlv) < 0) {
free(xtlv);
return -errno;
}
if (op_flag == 0) {
if (xtlv->tlv[1] + 2 * sizeof(unsigned int) > tlv_size)
return -EFAULT;
memcpy(tlv, xtlv->tlv, xtlv->tlv[1] + 2 * sizeof(unsigned int));
}
free(xtlv);
return 0;
}
static int snd_ctl_hw_hwdep_next_device(snd_ctl_t *handle, int * device)
{
snd_ctl_hw_t *hw = handle->private_data;
@ -305,6 +338,7 @@ snd_ctl_ops_t snd_ctl_hw_ops = {
.element_write = snd_ctl_hw_elem_write,
.element_lock = snd_ctl_hw_elem_lock,
.element_unlock = snd_ctl_hw_elem_unlock,
.element_tlv = snd_ctl_hw_elem_tlv,
.hwdep_next_device = snd_ctl_hw_hwdep_next_device,
.hwdep_info = snd_ctl_hw_hwdep_info,
.pcm_next_device = snd_ctl_hw_pcm_next_device,