Exemplo n.º 1
0
void full_demod(struct fm_state *fm)
{
	uint8_t dump[BUFFER_DUMP];
	int i, sr, freq_next, n_read, hop = 0;
	pthread_rwlock_wrlock(&data_rw);
	rotate_90(fm->buf, fm->buf_len);
	if (fm->fir_enable) {
		low_pass_fir(fm, fm->buf, fm->buf_len);
	} else {
		low_pass(fm, fm->buf, fm->buf_len);
	}
	pthread_rwlock_unlock(&data_rw);
	fm->mode_demod(fm);
	if (fm->mode_demod == &raw_demod) {
		fwrite(fm->signal2, 2, fm->signal2_len, fm->file);
		return;
	}
	sr = post_squelch(fm);
	if (!sr && fm->squelch_hits > fm->conseq_squelch) {
		if (fm->terminate_on_squelch) {
			fm->exit_flag = 1;}
		if (fm->freq_len == 1) {  /* mute */
			for (i=0; i<fm->signal_len; i++) {
				fm->signal2[i] = 0;}
		}
		else {
			hop = 1;}
	}
	if (fm->post_downsample > 1) {
		fm->signal2_len = low_pass_simple(fm->signal2, fm->signal2_len, fm->post_downsample);}
	if (fm->output_rate > 0) {
		low_pass_real(fm);
	}
	if (fm->deemph) {
		deemph_filter(fm);}
	if (fm->dc_block) {
		dc_block_filter(fm);}
	/* ignore under runs for now */
	fwrite(fm->signal2, 2, fm->signal2_len, fm->file);
	if (hop) {
		freq_next = (fm->freq_now + 1) % fm->freq_len;
		optimal_settings(fm, freq_next, 1);
		fm->squelch_hits = fm->conseq_squelch + 1;  /* hair trigger */
		/* wait for settling and flush buffer */
		usleep(5000);
		rtlsdr_read_sync(dev, &dump, BUFFER_DUMP, &n_read);
		if (n_read != BUFFER_DUMP) {
			fprintf(stderr, "Error: bad retune.\n");}
	}
}
Exemplo n.º 2
0
void full_demod(unsigned char *buf, uint32_t len, struct fm_state *fm)
{
	int sr, freq_next;
	rotate_90(buf, len);
	if (fm->fir_enable) {
		low_pass_fir(fm, buf, len);
	} else {
		low_pass(fm, buf, len);
	}
	fm_demod(fm);
	sr = post_squelch(fm);
	if (fm->post_downsample > 1) {
		fm->signal_len = low_pass_simple(fm->signal2, fm->signal_len/2, fm->post_downsample)*2;}
	/* ignore under runs for now */
	fwrite(fm->signal2, 2, fm->signal_len/2, fm->file);
	if (fm->freq_len > 1 && !sr && fm->squelch_hits > CONSEQ_SQUELCH) {
		freq_next = (fm->freq_now + 1) % fm->freq_len;
		optimal_settings(fm, freq_next, 1);
		fm->squelch_hits = CONSEQ_SQUELCH + 1;  /* hair trigger */
		/* wait for settling and dump buffer */
		usleep(5000);
		rtlsdr_read_sync(dev, NULL, 4096, NULL);
	}
}