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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <linux/dvb/frontend.h>
#include <linux/dvb/dmx.h>
static char FRONTEND_DEV [80];
static char DEMUX_DEV [80];
static int exit_after_tuning;
#define CHANNEL_FILE "channels.conf"
#define ERROR(x...) \
do { \
fprintf(stderr, "ERROR: "); \
fprintf(stderr, x); \
fprintf (stderr, "\n"); \
} while (0)
#define PERROR(x...) \
do { \
fprintf(stderr, "ERROR: "); \
fprintf(stderr, x); \
fprintf (stderr, " (%s)\n", strerror(errno)); \
} while (0)
typedef struct {
char *name;
int value;
} Param;
static const Param inversion_list[] = {
{ "INVERSION_OFF", INVERSION_OFF },
{ "INVERSION_ON", INVERSION_ON },
{ "INVERSION_AUTO", INVERSION_AUTO }
};
static const Param fec_list[] = {
{ "FEC_1_2", FEC_1_2 },
{ "FEC_2_3", FEC_2_3 },
{ "FEC_3_4", FEC_3_4 },
{ "FEC_4_5", FEC_4_5 },
{ "FEC_5_6", FEC_5_6 },
{ "FEC_6_7", FEC_6_7 },
{ "FEC_7_8", FEC_7_8 },
{ "FEC_8_9", FEC_8_9 },
{ "FEC_AUTO", FEC_AUTO },
{ "FEC_NONE", FEC_NONE }
};
static const Param modulation_list[] = {
{ "QAM_16", QAM_16 },
{ "QAM_32", QAM_32 },
{ "QAM_64", QAM_64 },
{ "QAM_128", QAM_128 },
{ "QAM_256", QAM_256 },
{ "QAM_AUTO", QAM_AUTO }
};
#define LIST_SIZE(x) sizeof(x)/sizeof(Param)
static
int parse_param(const char *val, const Param * plist, int list_size, int *ok)
{
int i;
for (i = 0; i < list_size; i++) {
if (strcasecmp(plist[i].name, val) == 0) {
*ok = 1;
return plist[i].value;
}
}
*ok = 0;
return -1;
}
static char line_buf[256];
static
char *find_channel(FILE *f, int list_channels, int *chan_no, const char *channel)
{
size_t l;
int lno = 0;
l = channel ? strlen(channel) : 0;
while (!feof(f)) {
if (!fgets(line_buf, sizeof(line_buf), f))
return NULL;
lno++;
if (list_channels) {
printf("%3d %s", lno, line_buf);
}
else if (*chan_no) {
if (*chan_no == lno)
return line_buf;
}
else if ((strncasecmp(channel, line_buf, l) == 0)
&& (line_buf[l] == ':')) {
*chan_no = lno;
return line_buf;
}
};
return NULL;
}
int parse(const char *fname, int list_channels, int chan_no, const char *channel,
struct dvb_frontend_parameters *frontend, int *vpid, int *apid)
{
FILE *f;
char *chan;
char *name, *inv, *fec, *mod;
int ok;
if ((f = fopen(fname, "r")) == NULL) {
PERROR("could not open file '%s'", fname);
return -1;
}
chan = find_channel(f, list_channels, &chan_no, channel);
fclose(f);
if (list_channels)
return 0;
if (!chan) {
ERROR("could not find channel '%s' in channel list",
channel);
return -2;
}
printf("%3d %s", chan_no, chan);
if ((sscanf(chan, "%a[^:]:%d:%a[^:]:%d:%a[^:]:%a[^:]:%d:%d\n",
&name, &frontend->frequency,
&inv, &frontend->u.qam.symbol_rate,
&fec, &mod, vpid, apid) != 8)
|| !name || !inv || !fec | !mod) {
ERROR("cannot parse service data");
return -3;
}
frontend->inversion = parse_param(inv, inversion_list, LIST_SIZE(inversion_list), &ok);
if (!ok) {
ERROR("inversion field syntax '%s'", inv);
return -4;
}
frontend->u.qam.fec_inner = parse_param(fec, fec_list, LIST_SIZE(fec_list), &ok);
if (!ok) {
ERROR("FEC field syntax '%s'", fec);
return -5;
}
frontend->u.qam.modulation = parse_param(mod, modulation_list,
LIST_SIZE(modulation_list), &ok);
if (!ok) {
ERROR("modulation field syntax '%s'", mod);
return -6;
}
printf("%3d %s: f %d, s %d, i %d, fec %d, qam %d, v %#x, a %#x\n",
chan_no, name, frontend->frequency, frontend->u.qam.symbol_rate,
frontend->inversion, frontend->u.qam.fec_inner,
frontend->u.qam.modulation, *vpid, *apid);
free(name);
free(inv);
free(fec);
free(mod);
return 0;
}
static
int set_pesfilter (int fd, int pid, dmx_pes_type_t type, int dvr)
{
struct dmx_pes_filter_params pesfilter;
if (pid <= 0 || pid >= 0x1fff)
return 0;
pesfilter.pid = pid;
pesfilter.input = DMX_IN_FRONTEND;
pesfilter.output = dvr ? DMX_OUT_TS_TAP : DMX_OUT_DECODER;
pesfilter.pes_type = type;
pesfilter.flags = DMX_IMMEDIATE_START;
if (ioctl(fd, DMX_SET_PES_FILTER, &pesfilter) < 0) {
PERROR ("ioctl(DMX_SET_PES_FILTER) for %s PID failed",
type == DMX_PES_AUDIO ? "Audio" :
type == DMX_PES_VIDEO ? "Video" : "??");
return -1;
}
return 0;
}
static
int setup_frontend(int fe_fd, struct dvb_frontend_parameters *frontend)
{
struct dvb_frontend_info fe_info;
if (ioctl(fe_fd, FE_GET_INFO, &fe_info) < 0) {
PERROR ("ioctl FE_GET_INFO failed");
return -1;
}
if (fe_info.type != FE_QAM) {
ERROR ("frontend device is not a QAM (DVB-C) device");
return -1;
}
if (ioctl(fe_fd, FE_SET_FRONTEND, frontend) < 0) {
PERROR ("ioctl FE_SET_FRONTEND failed");
return -1;
}
return 0;
}
static
int check_frontend (int fe_fd, int human_readable)
{
fe_status_t status;
uint16_t snr, signal;
uint32_t ber, uncorrected_blocks;
do {
ioctl(fe_fd, FE_READ_STATUS, &status);
ioctl(fe_fd, FE_READ_SIGNAL_STRENGTH, &signal);
ioctl(fe_fd, FE_READ_SNR, &snr);
ioctl(fe_fd, FE_READ_BER, &ber);
ioctl(fe_fd, FE_READ_UNCORRECTED_BLOCKS, &uncorrected_blocks);
if (human_readable) {
printf ("status %02x | signal %3u%% | snr %3u%% | ber %d | unc %d | ",
status, (signal * 100) / 0xffff, (snr * 100) / 0xffff, ber, uncorrected_blocks);
} else {
printf ("status %02x | signal %04x | snr %04x | ber %08x | unc %08x | ",
status, signal, snr, ber, uncorrected_blocks);
}
if (status & FE_HAS_LOCK)
printf("FE_HAS_LOCK");
usleep(1000000);
printf("\n");
if (exit_after_tuning && (status & FE_HAS_LOCK))
break;
} while (1);
return 0;
}
static const char *usage = "\nusage: %s [-a adapter_num] [-f frontend_id] [-d demux_id] [-c conf_file] [ -H ] {<channel name>| -n channel_num} [-x]\n"
" or: %s [-c conf_file] -l\n\n";
int main(int argc, char **argv)
{
struct dvb_frontend_parameters frontend_param;
char *homedir = getenv("HOME");
char *confname = NULL;
char *channel = NULL;
int adapter = 0, frontend = 0, demux = 0, dvr = 0;
int vpid, apid;
int frontend_fd, video_fd, audio_fd;
int opt, list_channels = 0, chan_no = 0;
int human_readable = 0;
while ((opt = getopt(argc, argv, "Hln:hrn:a:f:d:c:x")) != -1) {
switch (opt) {
case 'a':
adapter = strtoul(optarg, NULL, 0);
break;
case 'f':
frontend = strtoul(optarg, NULL, 0);
break;
case 'd':
demux = strtoul(optarg, NULL, 0);
break;
case 'r':
dvr = 1;
break;
case 'l':
list_channels = 1;
break;
case 'n':
chan_no = strtoul(optarg, NULL, 0);
break;
case 'x':
exit_after_tuning = 1;
break;
case 'H':
human_readable = 1;
break;
case 'c':
confname = optarg;
break;
case '?':
case 'h':
default:
fprintf (stderr, usage, argv[0], argv[0]);
return -1;
};
}
if (optind < argc)
channel = argv[optind];
if (!channel && chan_no <= 0 && !list_channels) {
fprintf (stderr, usage, argv[0], argv[0]);
return -1;
}
if (!homedir)
ERROR("$HOME not set");
snprintf (FRONTEND_DEV, sizeof(FRONTEND_DEV),
"/dev/dvb/adapter%i/frontend%i", adapter, frontend);
snprintf (DEMUX_DEV, sizeof(DEMUX_DEV),
"/dev/dvb/adapter%i/demux%i", adapter, demux);
printf ("using '%s' and '%s'\n", FRONTEND_DEV, DEMUX_DEV);
if (!confname)
{
int len = strlen(homedir) + strlen(CHANNEL_FILE) + 18;
if (!homedir)
ERROR("$HOME not set");
confname = malloc(len);
snprintf(confname, len, "%s/.czap/%i/%s",
homedir, adapter, CHANNEL_FILE);
if (access(confname, R_OK))
snprintf(confname, len, "%s/.czap/%s",
homedir, CHANNEL_FILE);
}
printf("reading channels from file '%s'\n", confname);
memset(&frontend_param, 0, sizeof(struct dvb_frontend_parameters));
if (parse(confname, list_channels, chan_no, channel, &frontend_param, &vpid, &apid))
return -1;
if (list_channels)
return 0;
if ((frontend_fd = open(FRONTEND_DEV, O_RDWR)) < 0) {
PERROR("failed opening '%s'", FRONTEND_DEV);
return -1;
}
if (setup_frontend(frontend_fd, &frontend_param) < 0)
return -1;
if ((video_fd = open(DEMUX_DEV, O_RDWR)) < 0) {
PERROR("failed opening '%s'", DEMUX_DEV);
return -1;
}
if (set_pesfilter (video_fd, vpid, DMX_PES_VIDEO, dvr) < 0)
return -1;
if ((audio_fd = open(DEMUX_DEV, O_RDWR)) < 0) {
PERROR("failed opening '%s'", DEMUX_DEV);
return -1;
}
if (set_pesfilter (audio_fd, apid, DMX_PES_AUDIO, dvr) < 0)
return -1;
check_frontend (frontend_fd, human_readable);
close (audio_fd);
close (video_fd);
close (frontend_fd);
return 0;
}
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