/*! \brief The avmd session data initialization function
* @author Eric des Courtis
* @param avmd_session A reference to a avmd session
* @param fs_session A reference to a FreeSWITCH session
*/
static void init_avmd_session_data(avmd_session_t *avmd_session, switch_core_session_t *fs_session)
{
/*! This is a worst case sample rate estimate */
avmd_session->rate = 48000;
INIT_CIRC_BUFFER(&avmd_session->b, BEEP_LEN(avmd_session->rate), FRAME_LEN(avmd_session->rate), fs_session);
avmd_session->session = fs_session;
avmd_session->pos = 0;
avmd_session->state.last_beep = 0;
avmd_session->state.beep_state = BEEP_NOTDETECTED;
INIT_SMA_BUFFER(
&avmd_session->sma_b,
BEEP_LEN(avmd_session->rate) / SINE_LEN(avmd_session->rate),
fs_session
);
}
int8_t frame_get_stream(struct frames_buffer *f_buf, void *dest_buf, uint16_t len, uint8_t *data_len)
{
struct frame *frame_rec = &f_buf->frame_record[f_buf->tail];
uint8_t fr_type;
int8_t ret, f_ret = FRAME_OK;
if (f_buf->cnt == 0 && f_buf->tail == f_buf->head) {
return FRAME_BUF_EMPTY; // Buffer is EMPTY
}
if (len < FRAME_LEN(frame_rec))
return -FRAME_ERR_NOMEM;
ret = frame_decode(frame_rec, dest_buf,
data_len, &fr_type);
if (ret) {
f_ret = ret;
} else {
if (fr_type == FRAME_START) {
if (f_buf->start_found == 1) {
f_buf->start_found = 0;
return -FRAME_BRK_STREAM;
} else {
f_buf->start_found = 1;
}
} else if (fr_type == FRAME_END) {
f_buf->start_found = 0;
f_ret = FRAME_OK_END;
} else if (fr_type == FRAME_SIMPLE) {
if (f_buf->start_found == 1) {
f_buf->start_found = 0;
return -FRAME_BRK_STREAM;
}
f_ret = FRAME_OK_SIMPLE;
}
}
FRAME_BUF_PTR_INC(f_buf->tail);
f_buf->cnt--;
return f_ret;
}
int8_t frame_decode(struct frame *fr, void *data, uint8_t *data_len,
uint8_t *type)
{
uint8_t data_crc = 0xff, i;
*data_len = FRAME_LEN(fr);
*type = FRAME_TYPE(fr);
data_crc = frame_crc_calc(data_crc, fr->header);
for (i = 0; i < *data_len; i++) {
data_crc = frame_crc_calc(data_crc, fr->payload[i]);
}
if (data_crc == fr->checksum) {
memcpy(data, fr->payload, *data_len);
} else {
return -FRAME_ERR_CRC;
}
return FRAME_OK;
}
