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mpv/stream/dvb_tune.c

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/* dvbtune - tune.c
Copyright (C) Dave Chapman 2001,2002
Copyright (C) Rozhuk Ivan <rozhuk.im@gmail.com> 2016 - 2017
Modified for use with MPlayer, for details see the changelog at
http://svn.mplayerhq.hu/mplayer/trunk/
$Id$
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Or, point your browser to http://www.gnu.org/copyleft/gpl.html
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <poll.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <errno.h>
#include <linux/dvb/dmx.h>
#include <linux/dvb/frontend.h>
#include "osdep/io.h"
#include "dvbin.h"
#include "dvb_tune.h"
#include "common/msg.h"
/* Keep in sync with enum fe_delivery_system. */
static const char *dvb_delsys_str[] = {
"UNDEFINED",
"DVB-C ANNEX A",
"DVB-C ANNEX B",
"DVB-T",
"DSS",
"DVB-S",
"DVB-S2",
"DVB-H",
"ISDBT",
"ISDBS",
"ISDBC",
"ATSC",
"ATSCMH",
"DTMB",
"CMMB",
"DAB",
"DVB-T2",
"TURBO",
"DVB-C ANNEX C",
NULL
};
const char *get_dvb_delsys(unsigned int delsys)
{
if (SYS_DVB__COUNT__ <= delsys)
return dvb_delsys_str[0];
return dvb_delsys_str[delsys];
}
unsigned int dvb_get_tuner_delsys_mask(int fe_fd, struct mp_log *log)
{
unsigned int ret_mask = 0, delsys;
struct dtv_property prop[1];
struct dtv_properties cmdseq = {.num = 1, .props = prop};
mp_verbose(log, "Querying tuner frontend type via DVBv5 API for frontend FD %d\n",
fe_fd);
prop[0].cmd = DTV_ENUM_DELSYS;
if (ioctl(fe_fd, FE_GET_PROPERTY, &cmdseq) < 0) {
mp_err(log, "DVBv5: FE_GET_PROPERTY(DTV_ENUM_DELSYS) error: %d, FD: %d\n\n", errno, fe_fd);
return ret_mask;
}
unsigned int i, delsys_count = prop[0].u.buffer.len;
mp_verbose(log, "DVBv5: Number of supported delivery systems: %d\n", delsys_count);
if (delsys_count == 0) {
mp_err(log, "DVBv5: Frontend FD %d returned no delivery systems!\n", fe_fd);
return ret_mask;
}
for (i = 0; i < delsys_count; i++) {
delsys = (unsigned int)prop[0].u.buffer.data[i];
DELSYS_SET(ret_mask, delsys);
mp_verbose(log, "DVBv5: Tuner frontend type seems to be %s\n", get_dvb_delsys(delsys));
}
return ret_mask;
}
int dvb_open_devices(dvb_priv_t *priv, unsigned int adapter,
unsigned int frontend, unsigned int demux_cnt)
{
unsigned int i;
char frontend_dev[PATH_MAX], dvr_dev[PATH_MAX], demux_dev[PATH_MAX];
dvb_state_t* state = priv->state;
snprintf(frontend_dev, sizeof(frontend_dev), "/dev/dvb/adapter%u/frontend%u", adapter, frontend);
snprintf(dvr_dev, sizeof(dvr_dev), "/dev/dvb/adapter%u/dvr0", adapter);
snprintf(demux_dev, sizeof(demux_dev), "/dev/dvb/adapter%u/demux0", adapter);
MP_VERBOSE(priv, "DVB_OPEN_DEVICES: frontend: %s\n", frontend_dev);
state->fe_fd = open(frontend_dev, O_RDWR | O_NONBLOCK | O_CLOEXEC);
if (state->fe_fd < 0) {
MP_ERR(priv, "ERROR OPENING FRONTEND DEVICE %s: ERRNO %d\n",
frontend_dev, errno);
return 0;
}
state->demux_fds_cnt = 0;
MP_VERBOSE(priv, "DVB_OPEN_DEVICES(%d)\n", demux_cnt);
for (i = 0; i < demux_cnt; i++) {
state->demux_fds[i] = open(demux_dev, O_RDWR | O_NONBLOCK | O_CLOEXEC);
if (state->demux_fds[i] < 0) {
MP_ERR(priv, "ERROR OPENING DEMUX 0: %d\n", errno);
return 0;
} else {
MP_VERBOSE(priv, "OPEN(%d), file %s: FD=%d, CNT=%d\n", i, demux_dev,
state->demux_fds[i], state->demux_fds_cnt);
state->demux_fds_cnt++;
}
}
state->dvr_fd = open(dvr_dev, O_RDONLY | O_NONBLOCK | O_CLOEXEC);
if (state->dvr_fd < 0) {
MP_ERR(priv, "ERROR OPENING DVR DEVICE %s: %d\n", dvr_dev, errno);
return 0;
}
return 1;
}
int dvb_fix_demuxes(dvb_priv_t *priv, unsigned int cnt)
{
int i;
char demux_dev[PATH_MAX];
dvb_state_t* state = priv->state;
snprintf(demux_dev, sizeof(demux_dev), "/dev/dvb/adapter%d/demux0",
state->adapters[state->cur_adapter].devno);
MP_VERBOSE(priv, "FIX %d -> %d\n", state->demux_fds_cnt, cnt);
if (state->demux_fds_cnt >= cnt) {
for (i = state->demux_fds_cnt - 1; i >= (int)cnt; i--) {
MP_VERBOSE(priv, "FIX, CLOSE fd(%d): %d\n", i, state->demux_fds[i]);
close(state->demux_fds[i]);
}
state->demux_fds_cnt = cnt;
} else {
for (i = state->demux_fds_cnt; i < cnt; i++) {
state->demux_fds[i] = open(demux_dev,
O_RDWR | O_NONBLOCK | O_CLOEXEC);
MP_VERBOSE(priv, "FIX, OPEN fd(%d): %d\n", i, state->demux_fds[i]);
if (state->demux_fds[i] < 0) {
MP_ERR(priv, "ERROR OPENING DEMUX 0: %d\n", errno);
return 0;
} else
state->demux_fds_cnt++;
}
}
return 1;
}
int dvb_set_ts_filt(dvb_priv_t *priv, int fd, uint16_t pid,
dmx_pes_type_t pestype)
{
int i;
struct dmx_pes_filter_params pesFilterParams;
pesFilterParams.pid = pid;
pesFilterParams.input = DMX_IN_FRONTEND;
pesFilterParams.output = DMX_OUT_TS_TAP;
pesFilterParams.pes_type = pestype;
pesFilterParams.flags = DMX_IMMEDIATE_START;
{
int buffersize = 256 * 1024;
if (ioctl(fd, DMX_SET_BUFFER_SIZE, buffersize) < 0)
MP_ERR(priv, "ERROR IN DMX_SET_BUFFER_SIZE %i for fd %d: ERRNO: %d\n",
pid, fd, errno);
}
errno = 0;
if ((i = ioctl(fd, DMX_SET_PES_FILTER, &pesFilterParams)) < 0) {
MP_ERR(priv, "ERROR IN SETTING DMX_FILTER %i for fd %d: ERRNO: %d\n",
pid, fd, errno);
return 0;
}
MP_VERBOSE(priv, "SET PES FILTER ON PID %d to fd %d, RESULT: %d, ERRNO: %d\n",
pid, fd, i, errno);
return 1;
}
int dvb_get_pmt_pid(dvb_priv_t *priv, int devno, int service_id)
{
/* We need special filters on the demux,
so open one locally, and close also here. */
char demux_dev[PATH_MAX];
snprintf(demux_dev, sizeof(demux_dev), "/dev/dvb/adapter%d/demux0", devno);
struct dmx_sct_filter_params fparams;
memset(&fparams, 0x00, sizeof(fparams));
fparams.pid = 0;
fparams.filter.filter[0] = 0x00;
fparams.filter.mask[0] = 0xff;
fparams.timeout = 0;
fparams.flags = DMX_IMMEDIATE_START | DMX_CHECK_CRC;
int pat_fd;
if ((pat_fd = open(demux_dev, O_RDWR)) < 0) {
MP_ERR(priv, "Opening PAT DEMUX failed, error: %d", errno);
return -1;
}
if (ioctl(pat_fd, DMX_SET_FILTER, &fparams) < 0) {
MP_ERR(priv, "ioctl DMX_SET_FILTER failed, error: %d", errno);
close(pat_fd);
return -1;
}
int bytes_read;
int section_length;
unsigned char buft[4096];
unsigned char *bufptr = buft;
int pmt_pid = -1;
bool pat_read = false;
while (!pat_read) {
if (((bytes_read =
read(pat_fd, bufptr,
sizeof(buft))) < 0) && errno == EOVERFLOW)
bytes_read = read(pat_fd, bufptr, sizeof(buft));
if (bytes_read < 0) {
MP_ERR(priv, "PAT: read_sections: read error: %d", errno);
close(pat_fd);
return -1;
}
section_length = ((bufptr[1] & 0x0f) << 8) | bufptr[2];
if (bytes_read != section_length + 3)
continue;
bufptr += 8;
section_length -= 8;
/* assumes one section contains the whole pat */
pat_read = true;
while (section_length > 0) {
int this_service_id = (bufptr[0] << 8) | bufptr[1];
if (this_service_id == service_id) {
pmt_pid = ((bufptr[2] & 0x1f) << 8) | bufptr[3];
section_length = 0;
}
bufptr += 4;
section_length -= 4;
}
}
close(pat_fd);
return pmt_pid;
}
static void print_status(dvb_priv_t *priv, fe_status_t festatus)
{
MP_VERBOSE(priv, "FE_STATUS:");
if (festatus & FE_HAS_SIGNAL)
MP_VERBOSE(priv, " FE_HAS_SIGNAL");
if (festatus & FE_TIMEDOUT)
MP_VERBOSE(priv, " FE_TIMEDOUT");
if (festatus & FE_HAS_LOCK)
MP_VERBOSE(priv, " FE_HAS_LOCK");
if (festatus & FE_HAS_CARRIER)
MP_VERBOSE(priv, " FE_HAS_CARRIER");
if (festatus & FE_HAS_VITERBI)
MP_VERBOSE(priv, " FE_HAS_VITERBI");
if (festatus & FE_HAS_SYNC)
MP_VERBOSE(priv, " FE_HAS_SYNC");
MP_VERBOSE(priv, "\n");
}
static int check_status(dvb_priv_t *priv, int fd_frontend, int tmout)
{
int32_t strength;
fe_status_t festatus;
struct pollfd pfd[1];
int ok = 0, locks = 0;
time_t tm1, tm2;
pfd[0].fd = fd_frontend;
pfd[0].events = POLLPRI;
MP_VERBOSE(priv, "Getting frontend status\n");
tm1 = tm2 = time((time_t *) NULL);
while (!ok) {
festatus = 0;
if (poll(pfd, 1, tmout * 1000) > 0) {
if (pfd[0].revents & POLLPRI) {
if (ioctl(fd_frontend, FE_READ_STATUS, &festatus) >= 0) {
if (festatus & FE_HAS_LOCK)
locks++;
}
}
}
usleep(10000);
tm2 = time((time_t *) NULL);
if ((festatus & FE_TIMEDOUT) || (locks >= 2) || (tm2 - tm1 >= tmout))
ok = 1;
}
if (festatus & FE_HAS_LOCK) {
strength = 0;
if (ioctl(fd_frontend, FE_READ_BER, &strength) >= 0)
MP_VERBOSE(priv, "Bit error rate: %d\n", strength);
strength = 0;
if (ioctl(fd_frontend, FE_READ_SIGNAL_STRENGTH, &strength) >= 0)
MP_VERBOSE(priv, "Signal strength: %d\n", strength);
strength = 0;
if (ioctl(fd_frontend, FE_READ_SNR, &strength) >= 0)
MP_VERBOSE(priv, "SNR: %d\n", strength);
strength = 0;
if (ioctl(fd_frontend, FE_READ_UNCORRECTED_BLOCKS, &strength) >= 0)
MP_VERBOSE(priv, "UNC: %d\n", strength);
print_status(priv, festatus);
} else {
MP_ERR(priv, "Not able to lock to the signal on the given frequency, "
"timeout: %d\n", tmout);
return -1;
}
return 0;
}
struct diseqc_cmd {
struct dvb_diseqc_master_cmd cmd;
uint32_t wait;
};
static int diseqc_send_msg(int fd, fe_sec_voltage_t v, struct diseqc_cmd *cmd,
fe_sec_tone_mode_t t, fe_sec_mini_cmd_t b)
{
if (ioctl(fd, FE_SET_TONE, SEC_TONE_OFF) < 0)
return -1;
if (ioctl(fd, FE_SET_VOLTAGE, v) < 0)
return -1;
usleep(15 * 1000);
if (ioctl(fd, FE_DISEQC_SEND_MASTER_CMD, &cmd->cmd) < 0)
return -1;
usleep(cmd->wait * 1000);
usleep(15 * 1000);
if (ioctl(fd, FE_DISEQC_SEND_BURST, b) < 0)
return -1;
usleep(15 * 1000);
if (ioctl(fd, FE_SET_TONE, t) < 0)
return -1;
usleep(100000);
return 0;
}
/* digital satellite equipment control,
* specification is available from http://www.eutelsat.com/
*/
static int do_diseqc(int secfd, int sat_no, int polv, int hi_lo)
{
struct diseqc_cmd cmd = { {{0xe0, 0x10, 0x38, 0xf0, 0x00, 0x00}, 4}, 0 };
/* param: high nibble: reset bits, low nibble set bits,
* bits are: option, position, polarizaion, band
*/
cmd.cmd.msg[3] = 0xf0 | (((sat_no * 4) & 0x0f) | (hi_lo ? 1 : 0) | (polv ? 0 : 2));
return diseqc_send_msg(secfd, polv ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18,
&cmd, hi_lo ? SEC_TONE_ON : SEC_TONE_OFF,
((sat_no / 4) % 2) ? SEC_MINI_B : SEC_MINI_A);
}
static int dvbv5_tune(dvb_priv_t *priv, int fd_frontend,
unsigned int delsys, struct dtv_properties* cmdseq)
{
MP_VERBOSE(priv, "Tuning via S2API, channel is %s.\n",
get_dvb_delsys(delsys));
MP_VERBOSE(priv, "Dumping raw tuning commands and values:\n");
for (int i = 0; i < cmdseq->num; ++i) {
MP_VERBOSE(priv, "%02d: 0x%x(%d) => 0x%x(%d)\n",
i, cmdseq->props[i].cmd, cmdseq->props[i].cmd,
cmdseq->props[i].u.data, cmdseq->props[i].u.data);
}
if (ioctl(fd_frontend, FE_SET_PROPERTY, cmdseq) < 0) {
MP_ERR(priv, "ERROR tuning channel\n");
return -1;
}
return 0;
}
static int tune_it(dvb_priv_t *priv, int fd_frontend, unsigned int delsys,
unsigned int freq, unsigned int srate, char pol,
int stream_id,
fe_spectral_inversion_t specInv, unsigned int diseqc,
fe_modulation_t modulation,
fe_code_rate_t HP_CodeRate,
fe_transmit_mode_t TransmissionMode,
fe_guard_interval_t guardInterval,
fe_bandwidth_t bandwidth,
fe_code_rate_t LP_CodeRate, fe_hierarchy_t hier,
int timeout)
{
int hi_lo = 0, bandwidth_hz = 0;
dvb_state_t* state = priv->state;
MP_VERBOSE(priv, "TUNE_IT, fd_frontend %d, %s freq %lu, srate %lu, "
"pol %c, diseqc %u\n", fd_frontend,
get_dvb_delsys(delsys),
(long unsigned int)freq, (long unsigned int)srate,
(pol > ' ' ? pol : '-'), diseqc);
MP_VERBOSE(priv, "Using %s adapter %d\n",
get_dvb_delsys(delsys),
state->adapters[state->cur_adapter].devno);
{
/* discard stale QPSK events */
struct dvb_frontend_event ev;
while (true) {
if (ioctl(fd_frontend, FE_GET_EVENT, &ev) < 0)
break;
}
}
/* Prepare params, be verbose. */
switch (delsys) {
case SYS_DVBT2:
case SYS_DVBT:
if (freq < 1000000)
freq *= 1000UL;
switch (bandwidth) {
case BANDWIDTH_5_MHZ:
bandwidth_hz = 5000000;
break;
case BANDWIDTH_6_MHZ:
bandwidth_hz = 6000000;
break;
case BANDWIDTH_7_MHZ:
bandwidth_hz = 7000000;
break;
case BANDWIDTH_8_MHZ:
bandwidth_hz = 8000000;
break;
case BANDWIDTH_10_MHZ:
bandwidth_hz = 10000000;
break;
case BANDWIDTH_AUTO:
if (freq < 474000000) {
bandwidth_hz = 7000000;
} else {
bandwidth_hz = 8000000;
}
break;
default:
bandwidth_hz = 0;
break;
}
MP_VERBOSE(priv, "tuning %s to %d Hz, bandwidth: %d\n",
get_dvb_delsys(delsys), freq, bandwidth_hz);
break;
case SYS_DVBS2:
case SYS_DVBS:
if (freq > 2200000) {
// this must be an absolute frequency
if (freq < SLOF) {
freq -= LOF1;
hi_lo = 0;
} else {
freq -= LOF2;
hi_lo = 1;
}
}
MP_VERBOSE(priv, "tuning %s to Freq: %u, Pol: %c Srate: %d, "
"22kHz: %s, LNB: %d\n", get_dvb_delsys(delsys), freq,
pol, srate, hi_lo ? "on" : "off", diseqc);
if (do_diseqc(fd_frontend, diseqc, (pol == 'V' ? 1 : 0), hi_lo) == 0) {
MP_VERBOSE(priv, "DISEQC setting succeeded\n");
} else {
MP_ERR(priv, "DISEQC setting failed\n");
return -1;
}
break;
case SYS_DVBC_ANNEX_A:
case SYS_DVBC_ANNEX_C:
MP_VERBOSE(priv, "tuning %s to %d, srate=%d\n",
get_dvb_delsys(delsys), freq, srate);
break;
case SYS_ATSC:
case SYS_DVBC_ANNEX_B:
MP_VERBOSE(priv, "tuning %s to %d, modulation=%d\n",
get_dvb_delsys(delsys), freq, modulation);
break;
default:
MP_VERBOSE(priv, "Unknown FE type. Aborting\n");
return 0;
}
/* S2API is the DVB API new since 2.6.28.
* It is needed to tune to new delivery systems, e.g. DVB-S2.
* It takes a struct with a list of pairs of command + parameter.
*/
/* Reset before tune. */
struct dtv_property p_clear[] = {
{ .cmd = DTV_CLEAR },
};
struct dtv_properties cmdseq_clear = {
.num = 1,
.props = p_clear
};
if (ioctl(fd_frontend, FE_SET_PROPERTY, &cmdseq_clear) < 0) {
MP_ERR(priv, "FE_SET_PROPERTY DTV_CLEAR failed\n");
}
/* Tune. */
switch (delsys) {
case SYS_DVBS:
case SYS_DVBS2:
{
struct dtv_property p[] = {
{ .cmd = DTV_DELIVERY_SYSTEM, .u.data = delsys },
{ .cmd = DTV_FREQUENCY, .u.data = freq },
{ .cmd = DTV_MODULATION, .u.data = modulation },
{ .cmd = DTV_SYMBOL_RATE, .u.data = srate },
{ .cmd = DTV_INNER_FEC, .u.data = HP_CodeRate },
{ .cmd = DTV_INVERSION, .u.data = specInv },
{ .cmd = DTV_ROLLOFF, .u.data = ROLLOFF_AUTO },
{ .cmd = DTV_PILOT, .u.data = PILOT_AUTO },
{ .cmd = DTV_TUNE },
};
struct dtv_properties cmdseq = {
.num = sizeof(p) / sizeof(p[0]),
.props = p
};
if (dvbv5_tune(priv, fd_frontend, delsys, &cmdseq) != 0) {
goto error_tune;
}
}
break;
case SYS_DVBT:
case SYS_DVBT2:
{
struct dtv_property p[] = {
{ .cmd = DTV_DELIVERY_SYSTEM, .u.data = delsys },
{ .cmd = DTV_FREQUENCY, .u.data = freq },
{ .cmd = DTV_MODULATION, .u.data = modulation },
{ .cmd = DTV_SYMBOL_RATE, .u.data = srate },
{ .cmd = DTV_CODE_RATE_HP, .u.data = HP_CodeRate },
{ .cmd = DTV_CODE_RATE_LP, .u.data = LP_CodeRate },
{ .cmd = DTV_INVERSION, .u.data = specInv },
{ .cmd = DTV_BANDWIDTH_HZ, .u.data = bandwidth_hz },
{ .cmd = DTV_TRANSMISSION_MODE, .u.data = TransmissionMode },
{ .cmd = DTV_GUARD_INTERVAL, .u.data = guardInterval },
{ .cmd = DTV_HIERARCHY, .u.data = hier },
{ .cmd = DTV_STREAM_ID, .u.data = stream_id },
{ .cmd = DTV_TUNE },
};
struct dtv_properties cmdseq = {
.num = sizeof(p) / sizeof(p[0]),
.props = p
};
if (dvbv5_tune(priv, fd_frontend, delsys, &cmdseq) != 0) {
goto error_tune;
}
}
break;
case SYS_DVBC_ANNEX_A:
case SYS_DVBC_ANNEX_C:
{
struct dtv_property p[] = {
{ .cmd = DTV_DELIVERY_SYSTEM, .u.data = delsys },
{ .cmd = DTV_FREQUENCY, .u.data = freq },
{ .cmd = DTV_MODULATION, .u.data = modulation },
{ .cmd = DTV_SYMBOL_RATE, .u.data = srate },
{ .cmd = DTV_INNER_FEC, .u.data = HP_CodeRate },
{ .cmd = DTV_INVERSION, .u.data = specInv },
{ .cmd = DTV_TUNE },
};
struct dtv_properties cmdseq = {
.num = sizeof(p) / sizeof(p[0]),
.props = p
};
if (dvbv5_tune(priv, fd_frontend, delsys, &cmdseq) != 0) {
goto error_tune;
}
}
break;
case SYS_ATSC:
case SYS_DVBC_ANNEX_B:
{
struct dtv_property p[] = {
{ .cmd = DTV_DELIVERY_SYSTEM, .u.data = delsys },
{ .cmd = DTV_FREQUENCY, .u.data = freq },
{ .cmd = DTV_INVERSION, .u.data = specInv },
{ .cmd = DTV_MODULATION, .u.data = modulation },
{ .cmd = DTV_TUNE },
};
struct dtv_properties cmdseq = {
.num = sizeof(p) / sizeof(p[0]),
.props = p
};
if (dvbv5_tune(priv, fd_frontend, delsys, &cmdseq) != 0) {
goto error_tune;
}
}
break;
}
int tune_status = check_status(priv, fd_frontend, timeout);
if (tune_status != 0) {
MP_ERR(priv, "ERROR locking to channel\n");
}
return tune_status;
error_tune:
MP_ERR(priv, "ERROR tuning channel\n");
return -1;
}
int dvb_tune(dvb_priv_t *priv, unsigned int delsys,
int freq, char pol, int srate, int diseqc,
int stream_id, fe_spectral_inversion_t specInv,
fe_modulation_t modulation, fe_guard_interval_t guardInterval,
fe_transmit_mode_t TransmissionMode, fe_bandwidth_t bandWidth,
fe_code_rate_t HP_CodeRate,
fe_code_rate_t LP_CodeRate, fe_hierarchy_t hier,
int timeout)
{
MP_INFO(priv, "dvb_tune %s Freq: %lu\n",
get_dvb_delsys(delsys), (long unsigned int) freq);
dvb_state_t* state = priv->state;
int ris = tune_it(priv, state->fe_fd, delsys, freq, srate, pol,
stream_id, specInv, diseqc, modulation,
HP_CodeRate, TransmissionMode, guardInterval,
bandWidth, LP_CodeRate, hier, timeout);
if (ris != 0)
MP_INFO(priv, "dvb_tune, TUNING FAILED\n");
return ris == 0;
}
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