/* input some arbitrary (modulo 4) number of bytes of a 64k E1 channel,
* split it into the 16k subchannels */
int subch_demux_in(struct subch_demux *dmx, u_int8_t *data, int len)
{
int i, c;
/* we avoid partially filled bytes in outbuf */
if (len % 4)
return -EINVAL;
for (i = 0; i < len; i++) {
u_int8_t inbyte = data[i];
for (c = 0; c < NR_SUBCH; c++) {
struct demux_subch *sch = &dmx->subch[c];
u_int8_t inbits;
u_int8_t bit;
/* ignore inactive subchannels */
if (!(dmx->chan_activ & (1 << c)))
continue;
inbits = inbyte >> (c << 1);
/* two bits for each subchannel */
if (inbits & 0x01)
bit = 1;
else
bit = 0;
append_bit(sch, bit);
if (sync_hdr_complete(sch, bit))
resync_to_here(sch);
if (inbits & 0x02)
bit = 1;
else
bit = 0;
append_bit(sch, bit);
if (sync_hdr_complete(sch, bit))
resync_to_here(sch);
/* FIXME: verify the first bit in octet 2, 4, 6, ...
* according to TS 08.60 4.8.1 */
/* once we have reached TRAU_FRAME_BITS, call
* the TRAU frame handler callback function */
if (sch->out_idx >= TRAU_FRAME_BITS) {
if (sch->in_sync) {
dmx->out_cb(dmx, c, sch->out_bitbuf,
sch->out_idx, dmx->data);
sch->in_sync = 0;
}
sch->out_idx = 0;
}
}
}
return i;
}
error_type append(Si::iterator_range<element_type const *> data)
{
for (element_type value : data)
{
error_type error = append_bit(value);
if (error)
{
return error;
}
}
return error_type();
}
