szap.c

linux TV 源码

/* szap -- simple zapping tool for the Linux DVB API
 *
 * szap operates on VDR (http://www.cadsoft.de/people/kls/vdr/index.htm)
 * satellite channel lists (e.g. from http://www.dxandy.de/cgi-bin/dvbchan.pl).
 * szap assumes you have a "Universal LNB" (i.e. with LOFs 9750/10600 MHz).
 *
 * Compilation: `gcc -Wall -I../../ost/include -O2 szap.c -o szap`
 *  or, if your DVB driver is in the kernel source tree:
 *              `gcc -Wall -DDVB_IN_KERNEL -O2 szap.c -o szap`
 *
 * Copyright (C) 2001 Johannes Stezenbach ([e-mail])
 * for convergence integrated media
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/poll.h>
#include <fcntl.h>
#include <time.h>
#include <unistd.h>

#include <stdint.h>
#include <sys/time.h>

#include <linux/dvb/frontend.h>
#include <linux/dvb/dmx.h>

#ifndef TRUE
#define TRUE (1==1)
#endif
#ifndef FALSE
#define FALSE (1==0)
#endif

/* location of channel list file */
#define CHANNEL_FILE "channels.conf"

/* one line of the VDR channel file has the following format:
 * ^name:frequency_MHz:polarization:sat_no:symbolrate:vpid:apid:?:service_id$
 */


#define FRONTENDDEVICE "/dev/dvb/adapter%d/frontend%d"
#define DEMUXDEVICE "/dev/dvb/adapter%d/demux%d"


/* LNB hi/lo band switch frequency in kHz */
#define SWITCHFREQ 11700000
/* LNB hi/lo band local oscillator frequencies in kHz */
#define LOF_HI 10600000
#define LOF_LO 9750000

static int exit_after_tuning;

static char *usage_str =
    "\nusage: szap -l\n"
    "         list known channels\n"
    "       szap [options] {-n channel-number|channel_name}\n"
    "         zap to channel via number or full name (case insensitive)\n"
    "     -a number : use given adapter (default 0)\n"
    "     -f number : use given frontend (default 0)\n"
    "     -d number : use given demux (default 0)\n"
    "     -c file   : read channels list from 'file'\n"
    "     -x        : exit after tuning\n"
    "     -r        : set up /dev/dvb/adapterX/dvr0 for TS recording\n\n";


static void usage(void)
{
   fprintf(stderr, usage_str);
   exit(1);
}


static int set_demux(int dmxfd, int pid, int audio, int dvr)
{
   struct dmx_pes_filter_params pesfilter;

   if (pid <= 0 || pid >= 0x1fff) /* ignore this pid to allow radio services */
	   return TRUE;

   if (dvr) {
      int buffersize = 64 * 1024;
      if (ioctl(dmxfd, DMX_SET_BUFFER_SIZE, buffersize) == -1)
        perror("DMX_SET_BUFFER_SIZE failed");
   }

   pesfilter.pid = pid;
   pesfilter.input = DMX_IN_FRONTEND;
   pesfilter.output = dvr ? DMX_OUT_TS_TAP : DMX_OUT_DECODER;
   pesfilter.pes_type = audio ? DMX_PES_AUDIO : DMX_PES_VIDEO;
   pesfilter.flags = DMX_IMMEDIATE_START;

   if (ioctl(dmxfd, DMX_SET_PES_FILTER, &pesfilter) == -1) {
      fprintf(stderr, "DMX_SET_PES_FILTER failed "
	      "(PID = 0x%04x): %d %m\n", pid, errno);
      return FALSE;
   }

   return TRUE;
}


struct diseqc_cmd {
   struct dvb_diseqc_master_cmd cmd;
   uint32_t wait;
};

void 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) == -1)
      perror("FE_SET_TONE failed");
   if (ioctl(fd, FE_SET_VOLTAGE, v) == -1)
      perror("FE_SET_VOLTAGE failed");
   usleep(15 * 1000);
   if (ioctl(fd, FE_DISEQC_SEND_MASTER_CMD, &cmd->cmd) == -1)
      perror("FE_DISEQC_SEND_MASTER_CMD failed");
   usleep(cmd->wait * 1000);
   usleep(15 * 1000);
   if (ioctl(fd, FE_DISEQC_SEND_BURST, b) == -1)
      perror("FE_DISEQC_SEND_BURST failed");
   usleep(15 * 1000);
   if (ioctl(fd, FE_SET_TONE, t) == -1)
      perror("FE_SET_TONE failed");
}




/* digital satellite equipment control,
 * specification is available from http://www.eutelsat.com/
 */
static int diseqc(int secfd, int sat_no, int pol_vert, int hi_band)
{
   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_band ? 1 : 0) | (pol_vert ? 0 : 2));

   diseqc_send_msg(secfd, pol_vert ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18,
		   &cmd, hi_band ? SEC_TONE_ON : SEC_TONE_OFF,
		   (sat_no / 4) % 2 ? SEC_MINI_B : SEC_MINI_A);

   return TRUE;
}

static int do_tune(int fefd, unsigned int ifreq, unsigned int sr)
{
   struct dvb_frontend_parameters tuneto;
   struct dvb_frontend_event ev;

   /* discard stale QPSK events */
   while (1) {
      if (ioctl(fefd, FE_GET_EVENT, &ev) == -1)
	 break;
   }

   tuneto.frequency = ifreq;
   tuneto.inversion = INVERSION_AUTO;
   tuneto.u.qpsk.symbol_rate = sr;
   tuneto.u.qpsk.fec_inner = FEC_AUTO;

   if (ioctl(fefd, FE_SET_FRONTEND, &tuneto) == -1) {
      perror("FE_SET_FRONTEND failed");
      return FALSE;
   }

   return TRUE;
}


static
int check_frontend (int fe_fd, int dvr)
{
   fe_status_t status;
   uint16_t snr, signal;
   uint32_t ber, uncorrected_blocks;
   int timeout = 0;

   do {
      if (ioctl(fe_fd, FE_READ_STATUS, &status) == -1)
         perror("FE_READ_STATUS failed");
      /* some frontends might not support all these ioctls, thus we
       * avoid printing errors */
      if (ioctl(fe_fd, FE_READ_SIGNAL_STRENGTH, &signal) == -1)
         signal = -2;
      if (ioctl(fe_fd, FE_READ_SNR, &snr) == -1)
         snr = -2;
      if (ioctl(fe_fd, FE_READ_BER, &ber) == -1)
         ber = -2;
      if (ioctl(fe_fd, FE_READ_UNCORRECTED_BLOCKS, &uncorrected_blocks) == -1)
         uncorrected_blocks = -2;

      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");
      printf("\n");

      if (exit_after_tuning && ((status & FE_HAS_LOCK) || (++timeout >= 10)))
         break;

      usleep(1000000);
   } while (1);

   return 0;
}


static
int zap_to(unsigned int adapter, unsigned int frontend, unsigned int demux,
      unsigned int sat_no, unsigned int freq, unsigned int pol,
      unsigned int sr, unsigned int vpid, unsigned int apid, int dvr)
{
   char fedev[128], dmxdev[128];
   int fefd, videofd, audiofd;
   uint32_t ifreq;
   int hiband, result;
   struct dvb_frontend_info fe_info;

   snprintf(fedev, sizeof(fedev), FRONTENDDEVICE, adapter, frontend);
   snprintf(dmxdev, sizeof(dmxdev), DEMUXDEVICE, adapter, demux);
   printf("using '%s' and '%s'\n", fedev, dmxdev);

   if ((fefd = open(fedev, O_RDWR | O_NONBLOCK)) < 0) {
      perror("opening frontend failed");
      return FALSE;
   }

   result = ioctl(fefd, FE_GET_INFO, &fe_info);

   if (result < 0) {
      perror("ioctl FE_GET_INFO failed");
      close(fefd);
      return FALSE;
   }

   if (fe_info.type != FE_QPSK) {
      fprintf(stderr, "frontend device is not a QPSK (DVB-S) device!\n");
      close(fefd);
      return FALSE;
   }

   if ((videofd = open(dmxdev, O_RDWR)) < 0) {
      perror("opening video demux failed");
      close(fefd);
      return FALSE;
   }

   if ((audiofd = open(dmxdev, O_RDWR)) < 0) {
      perror("opening audio demux failed");
      close(videofd);
      close(fefd);
      return FALSE;
   }

   hiband = (freq >= SWITCHFREQ);
   if (hiband)
      ifreq = freq - LOF_HI;
   else
      ifreq = freq - LOF_LO;

   result = FALSE;

   if (diseqc(fefd, sat_no, pol, hiband))
      if (do_tune(fefd, ifreq, sr))
	 if (set_demux(videofd, vpid, 0, dvr))
	    if (set_demux(audiofd, apid, 1, dvr))
	       result = TRUE;

   check_frontend (fefd, dvr);
   
   close(audiofd);
   close(videofd);
   close(fefd);

   return result;
}


static int read_channels(const char *filename, int list_channels,
			 uint32_t chan_no, const char *chan_name,
			 unsigned int adapter, unsigned int frontend,
			 unsigned int demux, int dvr)
{
   FILE *cfp;
   char buf[4096];
   char *field, *tmp;
   unsigned int line = 0;
   unsigned int freq, pol, sat_no, sr, vpid, apid;

   if (!(cfp = fopen(filename, "r"))) {
      fprintf(stderr, "error opening channel list '%s': %d %m\n",
	      filename, errno);
      return FALSE;
   }

   while (!feof(cfp)) {
      if (fgets(buf, sizeof(buf), cfp)) {
	 line++;

	 if (chan_no && chan_no != line)
	    continue;

	 tmp = buf;
	 field = strsep(&tmp, ":");

	 if (!field)
	    goto syntax_err;

	 if (list_channels) {
	    printf("%03u %s\n", line, field);
	    continue;
	 }

	 if (chan_name && strcasecmp(chan_name, field) != 0)
	    continue;

	 printf("zapping to '%s':\n", field);

	 if (!(field = strsep(&tmp, ":")))
	    goto syntax_err;

	 freq = strtoul(field, NULL, 0);

	 if (!(field = strsep(&tmp, ":")))
	    goto syntax_err;

	 pol = (field[0] == 'h' ? 0 : 1);

	 if (!(field = strsep(&tmp, ":")))
	    goto syntax_err;

	 sat_no = strtoul(field, NULL, 0);

	 if (!(field = strsep(&tmp, ":")))
	    goto syntax_err;

	 sr = strtoul(field, NULL, 0) * 1000;

	 if (!(field = strsep(&tmp, ":")))
	    goto syntax_err;

	 vpid = strtoul(field, NULL, 0);

	 if (!(field = strsep(&tmp, ":")))
	    goto syntax_err;

	 apid = strtoul(field, NULL, 0);

	 printf("sat %u, frequency = %u MHz %c, symbolrate %u, "
		"vpid = 0x%04x, apid = 0x%04x\n",
		sat_no, freq, pol ? 'V' : 'H', sr, vpid, apid);

	 fclose(cfp);

	 if (zap_to(adapter, frontend, demux,
		  sat_no, freq * 1000, pol, sr, vpid, apid, dvr))
	    return TRUE;

	 return FALSE;

       syntax_err:
	 fprintf(stderr, "syntax error in line %u: '%s'\n", line, buf);
      } else if (ferror(cfp)) {
	 fprintf(stderr, "error reading channel list '%s': %d %m\n",
		 filename, errno);
	 fclose(cfp);
	 return FALSE;
      } else
	 break;
   }

   fclose(cfp);

   if (!list_channels) {
      fprintf(stderr, "channel not found\n");
      return FALSE;
   }

   return TRUE;
}


int main(int argc, char *argv[])
{
   const char *home;
   char chanfile[2 * PATH_MAX];
   int list_channels = 0;
   unsigned int chan_no = 0;
   const char *chan_name = NULL;
   unsigned int adapter = 0, frontend = 0, demux = 0, dvr = 0;
   int opt, copt = 0;

   while ((opt = getopt(argc, argv, "hlrn:a:f:d:c:x")) != -1) {
      switch (opt)
      {
	 case '?':
	 case 'h':
	 default:
	    usage();
	 case 'l':
	    list_channels = 1;
	    break;
	 case 'r':
	    dvr = 1;
	    break;
	 case 'n':
	    chan_no = strtoul(optarg, NULL, 0);
	    break;
	 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 'c':
	    copt = 1;
	    strncpy(chanfile, optarg, sizeof(chanfile));
	    break;
	 case 'x':
	    exit_after_tuning = 1;
      }
   }
   if (optind < argc)
      chan_name = argv[optind];
   if (chan_name && chan_no)
      usage();
   if (list_channels && (chan_name || chan_no))
      usage();
   if (!list_channels && !chan_name && !chan_no)
      usage();

   if (!copt) {
       if (!(home = getenv("HOME"))) {
          fprintf(stderr, "error: $HOME not set\n");
          return TRUE;
       }
       strncpy(chanfile, home, sizeof(chanfile));
       strcat(chanfile, "/.szap/" CHANNEL_FILE);
   }

   printf("reading channels from file '%s'\n", chanfile);

   if (!read_channels(chanfile, list_channels, chan_no, chan_name,
	    adapter, frontend, demux, dvr))
      return TRUE;

   return FALSE;
}