mpv/stream/stream_dvb.c

/*

dvbstream
(C) Dave Chapman <dave@dchapman.com> 2001, 2002.

Original authors: Nico, probably Arpi

Some code based on dvbstream, 0.4.3-pre3 (CVS checkout),
http://sourceforge.net/projects/dvbtools/

Modified for use with MPlayer, for details see the changelog at
http://svn.mplayerhq.hu/mplayer/trunk/
$Id$

Copyright notice:

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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

*/

#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <poll.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

#include <libavutil/avstring.h>

#include "osdep/io.h"
#include "misc/ctype.h"

#include "stream.h"
#include "options/m_config.h"
#include "options/m_option.h"
#include "options/options.h"
#include "options/path.h"

#include "dvbin.h"
#include "dvb_tune.h"


#define MAX_CHANNELS 8
#define CHANNEL_LINE_LEN 256
#define min(a, b) ((a) <= (b) ? (a) : (b))


//TODO: CAMBIARE list_ptr e da globale a per_priv

#define OPT_BASE_STRUCT struct dvb_params

/// URL definition
static const m_option_t stream_params[] = {
    OPT_STRING("prog", cfg_prog, 0),
    OPT_INTRANGE("card", cfg_card, 0, 1, 4),
    {0}
};

const struct m_sub_options stream_dvb_conf = {
    .opts = (const m_option_t[]) {
        OPT_STRING("prog", cfg_prog, 0),
        OPT_INTRANGE("card", cfg_card, 0, 1, 4),
        OPT_INTRANGE("timeout",  cfg_timeout, 0, 1, 30),
        OPT_STRING("file", cfg_file, 0),
        {0}
    },
    .size = sizeof(struct dvb_params),
    .defaults = &(const struct dvb_params){
        .cfg_prog = "",
        .cfg_card = 1,
        .cfg_timeout = 30,
    },
};

static void parse_vdr_par_string(const char* vdr_par_str, dvb_channel_t* ptr) {
  //FIXME: There is more information in this parameter string, especially related
  // to non-DVB-S reception. 
  if (vdr_par_str[0]) {
    const char* vdr_par = &vdr_par_str[0];
    while (vdr_par && *vdr_par) {
      switch (mp_toupper(*vdr_par)) {
      case 'H':
        ptr->pol = 'H';
        vdr_par++;
        break;
      case 'V':
        ptr->pol = 'V';
        vdr_par++;
        break;
      case 'S':
        vdr_par++;
        if (*vdr_par == '1') {
          ptr->is_dvb_s2 = true;
        } else {
          ptr->is_dvb_s2 = false;
        }
        vdr_par++;
        break;
      case 'P':
        vdr_par++;
        char *endptr = NULL;
        errno = 0;
        int n = strtol(vdr_par, &endptr, 10);
        if (!errno && endptr != vdr_par) {
          ptr->stream_id = n;
          vdr_par = endptr;
        }
        break;
      case 'I':
        vdr_par++;
        if (*vdr_par == '1') {
          ptr->inv = INVERSION_ON;
        } else {
          ptr->inv = INVERSION_OFF;
        }
        vdr_par++;
        break;
      default:
        vdr_par++;
      }
    }
  }
}

static char* dvb_strtok_r(char* s, const char* sep, char** p) {
  if (!s && !(s = *p)) {
    return NULL;
  }
  
  /* Skip leading separators. */
  s += strspn(s, sep);

  /* s points at first non-separator, or end of string. */
  if (!*s) {
    return (*p = 0);
  }

  /* Move *p to next separator. */
  *p = s + strcspn(s, sep);
  if (**p) {
    *(*p)++ = 0;
  } else {
    *p = 0;
  }
  return s;
}

static bool parse_pid_string(struct mp_log *log, char* pid_string, dvb_channel_t* ptr) {
  if (pid_string[0]) {
    int pcnt = 0;
    /** These tokens also catch vdr-style PID lists.
     * They can contain 123=deu@3,124=eng+jap@4;125
     * 3 and 4 are codes for codec type, =langLeft+langRight is allowed,
     * and ; may separate a dolby channel. 
     * With the numChars-test and the full token-list, all is handled gracefully. 
     */
    const char* tokens = "+,;";
    char* pidPart;
    char* savePtr;
    pidPart = dvb_strtok_r(pid_string, tokens, &savePtr);
    while (pidPart != NULL) {
      if (ptr->pids_cnt >= DMX_FILTER_SIZE-1) {
        mp_verbose(log, "Maximum number of PIDs for one channel reached, ignoring further ones!\n");
        return (pcnt > 0);
      }
      int numChars = 0;
      int pid = 0;
      pcnt += sscanf(pidPart, "%d%n", &pid, &numChars);
      if (numChars > 0) {
        ptr->pids[ptr->pids_cnt] = pid;
        ptr->pids_cnt++;
      }
      pidPart = dvb_strtok_r(NULL, tokens, &savePtr);
    }
    if (pcnt > 0) {
      return true;
    }
  }
  return false;
}

static dvb_channels_list *dvb_get_channels(struct mp_log *log, char *filename, int type)
{
        dvb_channels_list  *list;
        FILE *f;
        char line[CHANNEL_LINE_LEN], *colon;

        if (!filename)
            return NULL;

        int fields, cnt, k;
        int has8192, has0;
        dvb_channel_t *ptr, *tmp, chn;
        char tmp_lcr[256], tmp_hier[256], inv[256], bw[256], cr[256], mod[256], transm[256], gi[256], vpid_str[256], apid_str[256], tpid_str[256],
          vdr_par_str[256], vdr_loc_str[256];
        const char *cbl_conf = "%d:%255[^:]:%d:%255[^:]:%255[^:]:%255[^:]:%255[^:]\n";
        const char *sat_conf = "%d:%c:%d:%d:%255[^:]:%255[^:]\n";
        const char *ter_conf = "%d:%255[^:]:%255[^:]:%255[^:]:%255[^:]:%255[^:]:%255[^:]:%255[^:]:%255[^:]:%255[^:]:%255[^:]\n";
        const char *atsc_conf = "%d:%255[^:]:%255[^:]:%255[^:]\n";

        const char *vdr_conf = "%d:%255[^:]:%255[^:]:%d:%255[^:]:%255[^:]:%255[^:]:%*255[^:]:%d:%*d:%*d:%*d\n%n";

        mp_verbose(log, "CONFIG_READ FILE: %s, type: %d\n", filename, type);
        if((f=fopen(filename, "r"))==NULL)
        {
                mp_fatal(log, "CAN'T READ CONFIG FILE %s\n", filename);
                return NULL;
        }

        list = malloc(sizeof(dvb_channels_list));
        if(list == NULL)
        {
                fclose(f);
                mp_verbose(log, "DVB_GET_CHANNELS: couldn't malloc enough memory\n");
                return NULL;
        }

        ptr = &chn;
        list->NUM_CHANNELS = 0;
        list->channels = NULL;
        while(! feof(f))
        {
                if( fgets(line, CHANNEL_LINE_LEN, f) == NULL )
                        continue;

                if((line[0] == '#') || (strlen(line) == 0))
                        continue;

                colon = strchr(line, ':');
                if (colon) {
                  k = colon - line;
                  if(!k)
                    continue;
                  // In some modern VDR-style configs, channel name also has bouquet after ;.
                  // Parse that off, we ignore it.
                  char* bouquet_sep = strchr(line, ';');
                  int channel_name_length = k;
                  if (bouquet_sep && bouquet_sep < colon) {
                    channel_name_length = bouquet_sep - line;
                  }
                  ptr->name = malloc(channel_name_length+1);
                  if(! ptr->name)
                    continue;
                  av_strlcpy(ptr->name, line, channel_name_length+1);
                } else {
                  continue;
                }
                k++;
                vpid_str[0] = apid_str[0] = tpid_str[0] = 0;
                vdr_loc_str[0] = vdr_par_str[0] = 0;
                ptr->pids_cnt = 0;
                ptr->freq = 0;
                ptr->is_dvb_s2 = false;
                ptr->service_id = -1;
                ptr->stream_id = NO_STREAM_ID_FILTER;
                ptr->inv = INVERSION_AUTO;

                // Check if VDR-type channels.conf-line - then full line is consumed by the scan. 
                int num_chars = 0;
                fields = sscanf(&line[k], vdr_conf,
                                &ptr->freq, vdr_par_str, vdr_loc_str, &ptr->srate, vpid_str, apid_str, tpid_str, &ptr->service_id, &num_chars);
                
                if (num_chars == strlen(&line[k])) {
                  // It's a VDR-style config line.
                  parse_vdr_par_string(vdr_par_str, ptr);
                  // We still need the special SAT-handling here.
                  if (type != TUNER_TER && type != TUNER_CBL && type != TUNER_ATSC) {
                    ptr->freq *=  1000UL;
                    ptr->srate *=  1000UL;
                    ptr->tone = -1;
                    ptr->inv = INVERSION_AUTO;
                    ptr->cr = FEC_AUTO;
                    
                    if (vdr_loc_str[0]) {
                      // In older vdr config format, this field contained the DISEQc information.
                      // If it is numeric, assume that's it.
                      int diseqc_info = 0;
                      int valid_digits = 0;
                      if (sscanf(vdr_loc_str, "%d%n", &diseqc_info, &valid_digits) == 1) {
                        if (valid_digits == strlen(vdr_loc_str)) {
                          ptr->diseqc = diseqc_info;
                          if((ptr->diseqc > 4) || (ptr->diseqc < 0))
                            continue;
                          if(ptr->diseqc > 0)
                            ptr->diseqc--;
                        }
                      }
                    }
                    
                    mp_verbose(log, "SAT, NUM: %d, NUM_FIELDS: %d, NAME: %s, FREQ: %d, SRATE: %d, POL: %c, DISEQC: %d, S2: %s, StreamID: %d, SID: %d",
                               list->NUM_CHANNELS, fields, ptr->name, ptr->freq, ptr->srate, ptr->pol,  ptr->diseqc,
                               ptr->is_dvb_s2 ? "yes" : "no", ptr->stream_id, ptr->service_id);
                  } else {
                    mp_verbose(log, "VDR, NUM: %d, NUM_FIELDS: %d, NAME: %s, FREQ: %d, SRATE: %d",
                               list->NUM_CHANNELS, fields, ptr->name, ptr->freq, ptr->srate);
                  }
                } else if (type == TUNER_TER) {
                        fields = sscanf(&line[k], ter_conf,
                                &ptr->freq, inv, bw, cr, tmp_lcr, mod,
                                transm, gi, tmp_hier, vpid_str, apid_str);
                        mp_verbose(log, "TER, NUM: %d, NUM_FIELDS: %d, NAME: %s, FREQ: %d",
                                list->NUM_CHANNELS, fields, ptr->name, ptr->freq);
                } else if (type == TUNER_CBL) {
                        fields = sscanf(&line[k], cbl_conf,
                                &ptr->freq, inv, &ptr->srate,
                                cr, mod, vpid_str, apid_str);
                        mp_verbose(log, "CBL, NUM: %d, NUM_FIELDS: %d, NAME: %s, FREQ: %d, SRATE: %d",
                                list->NUM_CHANNELS, fields, ptr->name, ptr->freq, ptr->srate);
                }
#ifdef DVB_ATSC
                else if (type == TUNER_ATSC)
                {
                        fields = sscanf(&line[k], atsc_conf,
                                 &ptr->freq, mod, vpid_str, apid_str);
                        mp_verbose(log, "ATSC, NUM: %d, NUM_FIELDS: %d, NAME: %s, FREQ: %d\n",
                                list->NUM_CHANNELS, fields, ptr->name, ptr->freq);
                }
#endif
                else //SATELLITE
                {
                        fields = sscanf(&line[k], sat_conf,
                                        &ptr->freq, &ptr->pol, &ptr->diseqc, &ptr->srate, vpid_str, apid_str);
                        ptr->pol = mp_toupper(ptr->pol);
                        ptr->freq *=  1000UL;
                        ptr->srate *=  1000UL;
                        ptr->tone = -1;
                        ptr->inv = INVERSION_AUTO;
                        ptr->cr = FEC_AUTO;
                        if((ptr->diseqc > 4) || (ptr->diseqc < 0))
                            continue;
                        if(ptr->diseqc > 0)
                            ptr->diseqc--;
                        mp_verbose(log, "SAT, NUM: %d, NUM_FIELDS: %d, NAME: %s, FREQ: %d, SRATE: %d, POL: %c, DISEQC: %d",
                                list->NUM_CHANNELS, fields, ptr->name, ptr->freq, ptr->srate, ptr->pol, ptr->diseqc);
                }
                
                if (parse_pid_string(log, vpid_str, ptr)) {
                  fields++;
                }
                if (parse_pid_string(log, apid_str, ptr)) {
                  fields++;
                }
                /* If we do not know the service_id, PMT can not be extracted.
                   Teletext decoding will fail without PMT. */
                if (ptr->service_id != -1) {
                  if (parse_pid_string(log, tpid_str, ptr)) {
                    fields++;
                  }
                }
                
                
                if((fields < 2) || (ptr->pids_cnt <= 0) || (ptr->freq == 0) || (strlen(ptr->name) == 0))
                  continue;

                has8192 = has0 = 0;
                for(cnt = 0; cnt < ptr->pids_cnt; cnt++)
                {
                        if(ptr->pids[cnt] == 8192)
                                has8192 = 1;
                        if(ptr->pids[cnt] == 0)
                                has0 = 1;
                }
                if(has8192)
                {
                        ptr->pids[0] = 8192;
                        ptr->pids_cnt = 1;
                }
                else if(! has0)
                {
                        ptr->pids[ptr->pids_cnt] = 0;   //PID 0 is the PAT
                        ptr->pids_cnt++;
                }

                /* Add some PIDs which are mandatory in DVB, 
                 * and contain human-readable helpful data. */
                
                /* This is the STD, the service description table. 
                 * It contains service names and such, ffmpeg decodes it. */
                ptr->pids[ptr->pids_cnt] = 0x0011;
                ptr->pids_cnt++;

                /* This is the EIT, which contains EPG data. 
                 * ffmpeg can not decode it (yet), but e.g. VLC 
                 * shows what was recorded. */
                ptr->pids[ptr->pids_cnt] = 0x0012;
                ptr->pids_cnt++;

                if (ptr->service_id != -1) {
                  /* We have the PMT-PID in addition. 
                     This will be found later, when we tune to the channel.
                     Push back here to create the additional demux. */
                  ptr->pids[ptr->pids_cnt] = -1; // Placeholder. 
                  ptr->pids_cnt++;
                }
                
                mp_verbose(log, " PIDS: ");
                for(cnt = 0; cnt < ptr->pids_cnt; cnt++)
                        mp_verbose(log, " %d ", ptr->pids[cnt]);
                mp_verbose(log, "\n");

                if((type == TUNER_TER) || (type == TUNER_CBL))
                {
                        if(! strcmp(inv, "INVERSION_ON"))
                                ptr->inv = INVERSION_ON;
                        else if(! strcmp(inv, "INVERSION_OFF"))
                                ptr->inv = INVERSION_OFF;
                        else
                                ptr->inv = INVERSION_AUTO;


                        if(! strcmp(cr, "FEC_1_2"))
                                ptr->cr =FEC_1_2;
                        else if(! strcmp(cr, "FEC_2_3"))
                                ptr->cr =FEC_2_3;
                        else if(! strcmp(cr, "FEC_3_4"))
                                ptr->cr =FEC_3_4;
                        else if(! strcmp(cr, "FEC_4_5"))
                                ptr->cr =FEC_4_5;
                        else if(! strcmp(cr, "FEC_6_7"))
                                ptr->cr =FEC_6_7;
                        else if(! strcmp(cr, "FEC_8_9"))
                                ptr->cr =FEC_8_9;
                        else if(! strcmp(cr, "FEC_5_6"))
                                ptr->cr =FEC_5_6;
                        else if(! strcmp(cr, "FEC_7_8"))
                                ptr->cr =FEC_7_8;
                        else if(! strcmp(cr, "FEC_NONE"))
                                ptr->cr =FEC_NONE;
                        else ptr->cr =FEC_AUTO;
                }


                if((type == TUNER_TER) || (type == TUNER_CBL) || (type == TUNER_ATSC))
                {
                        if(! strcmp(mod, "QAM_128"))
                                ptr->mod = QAM_128;
                        else if(! strcmp(mod, "QAM_256"))
                                ptr->mod = QAM_256;
                        else if(! strcmp(mod, "QAM_64"))
                                ptr->mod = QAM_64;
                        else if(! strcmp(mod, "QAM_32"))
                                ptr->mod = QAM_32;
                        else if(! strcmp(mod, "QAM_16"))
                                ptr->mod = QAM_16;
#ifdef DVB_ATSC
                        else if(! strcmp(mod, "VSB_8") || ! strcmp(mod, "8VSB"))
                                ptr->mod = VSB_8;
                        else if(! strcmp(mod, "VSB_16") || !strcmp(mod, "16VSB"))
                                ptr->mod = VSB_16;
                        else if(! strcmp(mod, "QAM_AUTO"))
                                ptr->mod = QAM_AUTO;

#endif
                }

                if(type == TUNER_TER)
                {
                        if(! strcmp(bw, "BANDWIDTH_6_MHZ"))
                                ptr->bw = BANDWIDTH_6_MHZ;
                        else if(! strcmp(bw, "BANDWIDTH_7_MHZ"))
                                ptr->bw = BANDWIDTH_7_MHZ;
                        else if(! strcmp(bw, "BANDWIDTH_8_MHZ"))
                                ptr->bw = BANDWIDTH_8_MHZ;


                        if(! strcmp(transm, "TRANSMISSION_MODE_2K"))
                                ptr->trans = TRANSMISSION_MODE_2K;
                        else if(! strcmp(transm, "TRANSMISSION_MODE_8K"))
                                ptr->trans = TRANSMISSION_MODE_8K;
                        else if(! strcmp(transm, "TRANSMISSION_MODE_AUTO"))
                                ptr->trans = TRANSMISSION_MODE_AUTO;

                        if(! strcmp(gi, "GUARD_INTERVAL_1_32"))
                                ptr->gi = GUARD_INTERVAL_1_32;
                        else if(! strcmp(gi, "GUARD_INTERVAL_1_16"))
                                ptr->gi = GUARD_INTERVAL_1_16;
                        else if(! strcmp(gi, "GUARD_INTERVAL_1_8"))
                                ptr->gi = GUARD_INTERVAL_1_8;
                        else if(! strcmp(gi, "GUARD_INTERVAL_1_4"))
                                ptr->gi = GUARD_INTERVAL_1_4;
                        else ptr->gi = GUARD_INTERVAL_AUTO;

                        if(! strcmp(tmp_lcr, "FEC_1_2"))
                                ptr->cr_lp =FEC_1_2;
                        else if(! strcmp(tmp_lcr, "FEC_2_3"))
                                ptr->cr_lp =FEC_2_3;
                        else if(! strcmp(tmp_lcr, "FEC_3_4"))
                                ptr->cr_lp =FEC_3_4;
                        else if(! strcmp(tmp_lcr, "FEC_4_5"))
                                ptr->cr_lp =FEC_4_5;
                        else if(! strcmp(tmp_lcr, "FEC_6_7"))
                                ptr->cr_lp =FEC_6_7;
                        else if(! strcmp(tmp_lcr, "FEC_8_9"))
                                ptr->cr_lp =FEC_8_9;
                        else if(! strcmp(tmp_lcr, "FEC_5_6"))
                                ptr->cr_lp =FEC_5_6;
                        else if(! strcmp(tmp_lcr, "FEC_7_8"))
                                ptr->cr_lp =FEC_7_8;
                        else if(! strcmp(tmp_lcr, "FEC_NONE"))
                                ptr->cr_lp =FEC_NONE;
                        else ptr->cr_lp =FEC_AUTO;


                        if(! strcmp(tmp_hier, "HIERARCHY_1"))
                                ptr->hier = HIERARCHY_1;
                        else if(! strcmp(tmp_hier, "HIERARCHY_2"))
                                ptr->hier = HIERARCHY_2;
                        else if(! strcmp(tmp_hier, "HIERARCHY_4"))
                                ptr->hier = HIERARCHY_4;
                        else if(! strcmp(tmp_hier, "HIERARCHY_AUTO"))
                                ptr->hier = HIERARCHY_AUTO;
                        else    ptr->hier = HIERARCHY_NONE;
                }

                tmp = realloc(list->channels, sizeof(dvb_channel_t) * (list->NUM_CHANNELS + 1));
                if(tmp == NULL)
                        break;

                list->channels = tmp;
                memcpy(&(list->channels[list->NUM_CHANNELS]), ptr, sizeof(dvb_channel_t));
                list->NUM_CHANNELS++;
                if(sizeof(dvb_channel_t) * list->NUM_CHANNELS >= 1024*1024)
                {
                        mp_verbose(log, "dvbin.c, > 1MB allocated for channels struct, dropping the rest of the file\r\n");
                        break;
                }
        }

        fclose(f);
        if(list->NUM_CHANNELS == 0)
        {
                free(list->channels);
                free(list);
                return NULL;
        }

        list->current = 0;
        return list;
}

void dvb_free_config(dvb_config_t *config)
{
        int i, j;

        for(i=0; i<config->count; i++)
        {
                free(config->cards[i].name);
                if(!config->cards[i].list)
                        continue;
                if(config->cards[i].list->channels)
                {
                        for(j=0; j<config->cards[i].list->NUM_CHANNELS; j++)
                                free(config->cards[i].list->channels[j].name);
                        free(config->cards[i].list->channels);
                }
                free(config->cards[i].list);
        }
        free(config);
}

static int dvb_streaming_read(stream_t *stream, char *buffer, int size)
{
        struct pollfd pfds[1];
        int pos=0, tries, rk, fd;
        dvb_priv_t *priv  = (dvb_priv_t *) stream->priv;

        MP_TRACE(stream, "dvb_streaming_read(%d)\n", size);

        tries = priv->retry + 1;

        fd = priv->fd;
        while(pos < size)
        {
                pfds[0].fd = fd;
                pfds[0].events = POLLIN | POLLPRI;

                rk = size - pos;
                if(poll(pfds, 1, 500) <= 0)
                {
                        MP_ERR(stream, "dvb_streaming_read, attempt N. %d failed with errno %d when reading %d bytes\n", tries, errno, size-pos);
                        errno = 0;
                        if(--tries > 0)
                                continue;
                        else
                                break;
                }
                if((rk = read(fd, &buffer[pos], rk)) > 0)
                {
                        pos += rk;
                        MP_TRACE(stream, "ret (%d) bytes\n", pos);
                }
        }


        if(! pos)
                MP_ERR(stream, "dvb_streaming_read, return %d bytes\n", pos);

        return pos;
}

static void dvbin_close(stream_t *stream);

int dvb_set_channel(stream_t *stream, int card, int n)
{
        dvb_channels_list *new_list;
        dvb_channel_t *channel;
        dvb_priv_t *priv = stream->priv;
        char buf[4096];
        dvb_config_t *conf = (dvb_config_t *) priv->config;
        int devno;
        int i;

        if((card < 0) || (card > conf->count))
        {
                MP_ERR(stream, "dvb_set_channel: INVALID CARD NUMBER: %d vs %d, abort\n", card, conf->count);
                return 0;
        }

        devno = conf->cards[card].devno;
        new_list = conf->cards[card].list;
        if((n > new_list->NUM_CHANNELS) || (n < 0))
        {
                MP_ERR(stream, "dvb_set_channel: INVALID CHANNEL NUMBER: %d, for card %d, abort\n", n, card);
                return 0;
        }
        channel = &(new_list->channels[n]);

        if(priv->is_on) //the fds are already open and we have to stop the demuxers
        {
                for(i = 0; i < priv->demux_fds_cnt; i++)
                        dvb_demux_stop(priv->demux_fds[i]);

                priv->retry = 0;
                while(dvb_streaming_read(stream, buf, 4096) > 0);       //empty both the stream's and driver's buffer
                if(priv->card != card)
                {
                        dvbin_close(stream);
                        if(! dvb_open_devices(priv, devno, channel->pids_cnt))
                        {
                                MP_ERR(stream, "DVB_SET_CHANNEL, COULDN'T OPEN DEVICES OF CARD: %d, EXIT\n", card);
                                return 0;
                        }
                }
                else    //close all demux_fds with pos > pids required for the new channel or open other demux_fds if we have too few
                {
                        if(! dvb_fix_demuxes(priv, channel->pids_cnt))
                                return 0;
                }
        }
        else
        {
                if(! dvb_open_devices(priv, devno, channel->pids_cnt))
                {
                        MP_ERR(stream, "DVB_SET_CHANNEL2, COULDN'T OPEN DEVICES OF CARD: %d, EXIT\n", card);
                        return 0;
                }
        }

        priv->card = card;
        priv->list = new_list;
        priv->retry = 5;
        new_list->current = n;
        priv->fd = priv->dvr_fd;
        MP_VERBOSE(stream, "DVB_SET_CHANNEL: new channel name=%s, card: %d, channel %d\n", channel->name, card, n);

        stream_drop_buffers(stream);

        if(channel->freq != priv->last_freq)
                if (! dvb_tune(priv, channel->freq, channel->pol, channel->srate, channel->diseqc, channel->tone,
                               channel->is_dvb_s2, channel->stream_id, channel->inv, channel->mod, channel->gi,
                               channel->trans, channel->bw, channel->cr, channel->cr_lp, channel->hier, priv->cfg_timeout))
                        return 0;

        priv->last_freq = channel->freq;
        priv->is_on = 1;
        
        if (channel->service_id != -1) {
          /* We need the PMT-PID in addition. 
             If it has not yet beem resolved, do it now. */
          for (i = 0; i < channel->pids_cnt; i++) {
            if (channel->pids[i] == -1) {
              MP_VERBOSE(stream, "DVB_SET_CHANNEL: PMT-PID for service %d not resolved yet, parsing PAT...\n", channel->service_id);
              int pmt_pid = dvb_get_pmt_pid(priv, card, channel->service_id);
              MP_VERBOSE(stream, "DVB_SET_CHANNEL: Found PMT-PID: %d\n", pmt_pid);
              channel->pids[i] = pmt_pid;
            }
          }
        }

        // sets demux filters and restart the stream
        for(i = 0; i < channel->pids_cnt; i++)
        {
          if (channel->pids[i] == -1) {
            // In case PMT was not resolved, skip it here.
            MP_ERR(stream, "DVB_SET_CHANNEL: PMT-PID not found, teletext-decoding may fail.\n");
          } else {
            if (!dvb_set_ts_filt(priv,priv->demux_fds[i], channel->pids[i], DMX_PES_OTHER)) 
              return 0;
          }
        }

        return 1;
}



int dvb_step_channel(stream_t *stream, int dir)
{
        int new_current;
        dvb_channels_list *list;
        dvb_priv_t *priv = stream->priv;

        MP_VERBOSE(stream, "DVB_STEP_CHANNEL dir %d\n", dir);

        if(priv == NULL)
        {
                MP_ERR(stream, "dvb_step_channel: NULL priv_ptr, quit\n");
                return 0;
        }

        list = priv->list;
        if(list == NULL)
        {
                MP_ERR(stream, "dvb_step_channel: NULL list_ptr, quit\n");
                return 0;
        }

        new_current = (list->NUM_CHANNELS + list->current + (dir >= 0 ? 1 : -1)) % list->NUM_CHANNELS;

        return dvb_set_channel(stream, priv->card, new_current);
}

static int dvbin_stream_control(struct stream *s, int cmd, void *arg)
{
    int r;
    switch (cmd) {
    case STREAM_CTRL_DVB_SET_CHANNEL: {
        int *iarg = arg;
        r = dvb_set_channel(s, iarg[1], iarg[0]);
        return r ? STREAM_OK : STREAM_ERROR;
    }
    case STREAM_CTRL_DVB_STEP_CHANNEL:
        r = dvb_step_channel(s, *(int *)arg);
        return r ? STREAM_OK : STREAM_ERROR;
    }
    return STREAM_UNSUPPORTED;
}

static void dvbin_close(stream_t *stream)
{
        int i;
        dvb_priv_t *priv  = (dvb_priv_t *) stream->priv;

        for(i = priv->demux_fds_cnt-1; i >= 0; i--)
        {
                priv->demux_fds_cnt--;
                MP_VERBOSE(stream, "DVBIN_CLOSE, close(%d), fd=%d, COUNT=%d\n", i, priv->demux_fds[i], priv->demux_fds_cnt);
                close(priv->demux_fds[i]);
        }
        close(priv->dvr_fd);

        close(priv->fe_fd);
        priv->fe_fd = priv->sec_fd = priv->dvr_fd = -1;

        priv->is_on = 0;
        dvb_free_config(priv->config);
}


static int dvb_streaming_start(stream_t *stream, int tuner_type, char *progname)
{
        int i;
        dvb_channel_t *channel = NULL;
        dvb_priv_t *priv = stream->priv;
        dvb_priv_t *opts = priv;

        MP_VERBOSE(stream, "\r\ndvb_streaming_start(PROG: %s, CARD: %d)\r\n",
            opts->cfg_prog, opts->cfg_card);

        priv->is_on = 0;

        i = 0;
        while((channel == NULL) && i < priv->list->NUM_CHANNELS)
        {
                if(! strcmp(priv->list->channels[i].name, progname))
                        channel = &(priv->list->channels[i]);

                i++;
        }

        if(channel != NULL)
        {
                priv->list->current = i-1;
                MP_VERBOSE(stream, "PROGRAM NUMBER %d: name=%s, freq=%u\n", i-1, channel->name, channel->freq);
        }
        else
        {
                MP_ERR(stream, "\n\nDVBIN: no such channel \"%s\"\n\n", progname);
                return 0;
        }


        if(!dvb_set_channel(stream, priv->card, priv->list->current))
        {
                MP_ERR(stream, "ERROR, COULDN'T SET CHANNEL  %i: ", priv->list->current);
                dvbin_close(stream);
                return 0;
        }

        MP_VERBOSE(stream, "SUCCESSFUL EXIT from dvb_streaming_start\n");

        return 1;
}




static int dvb_open(stream_t *stream)
{
        // I don't force  the file format bacause, although it's almost always TS,
        // there are some providers that stream an IP multicast with M$ Mpeg4 inside
        dvb_priv_t *priv = stream->priv;
        priv->log = stream->log;
        dvb_priv_t *p = priv;
        char *progname;
        int tuner_type = 0, i;

        priv->fe_fd = priv->sec_fd = priv->dvr_fd = -1;
        priv->config = dvb_get_config(stream);
        if(priv->config == NULL)
        {
                MP_ERR(stream, "DVB CONFIGURATION IS EMPTY, exit\n");
                return STREAM_ERROR;
        }

        priv->card = -1;
        for(i=0; i<priv->config->count; i++)
        {
                if(priv->config->cards[i].devno+1 == p->cfg_card)
                {
                        priv->card = i;
                        break;
                }
        }

        if(priv->card == -1)
        {
                MP_ERR(stream, "NO CONFIGURATION FOUND FOR CARD N. %d, exit\n", p->cfg_card);
                return STREAM_ERROR;
        }
        priv->timeout = p->cfg_timeout;

        tuner_type = priv->config->cards[priv->card].type;

        if(tuner_type == 0)
        {
                MP_VERBOSE(stream, "OPEN_DVB: UNKNOWN OR UNDETECTABLE TUNER TYPE, EXIT\n");
                return STREAM_ERROR;
        }


        priv->tuner_type = tuner_type;

        MP_VERBOSE(stream, "OPEN_DVB: prog=%s, card=%d, type=%d\n",
                p->cfg_prog, priv->card+1, priv->tuner_type);

        priv->list = priv->config->cards[priv->card].list;

        if((! strcmp(p->cfg_prog, "")) && (priv->list != NULL))
                progname = priv->list->channels[0].name;
        else
                progname = p->cfg_prog;


        if(! dvb_streaming_start(stream, tuner_type, progname))
        {
                return STREAM_ERROR;
        }

        stream->type = STREAMTYPE_DVB;
        stream->fill_buffer = dvb_streaming_read;
        stream->close = dvbin_close;
        stream->control = dvbin_stream_control;

        stream->demuxer = "lavf";
        stream->lavf_type = "mpegts";

        return STREAM_OK;
}

#define MAX_CARDS 4
dvb_config_t *dvb_get_config(stream_t *stream)
{
        struct mp_log *log = stream->log;
        struct mpv_global *global = stream->global;
        dvb_priv_t *priv = stream->priv;
        int i, fd, type, size;
        char filename[30], *name;
        dvb_channels_list *list;
        dvb_card_config_t *cards = NULL, *tmp;
        dvb_config_t *conf = NULL;


        conf = malloc(sizeof(dvb_config_t));
        if(conf == NULL)
                return NULL;

        conf->priv = NULL;
        conf->count = 0;
        conf->cards = NULL;
        for(i=0; i<MAX_CARDS; i++)
        {
                snprintf(filename, sizeof(filename), "/dev/dvb/adapter%d/frontend0", i);
                fd = open(filename, O_RDONLY|O_NONBLOCK|O_CLOEXEC);
                if(fd < 0)
                {
                        mp_verbose(log, "DVB_CONFIG, can't open device %s, skipping\n", filename);
                        continue;
                }

                type = dvb_get_tuner_type(fd, log);
                close(fd);
                if(type != TUNER_SAT && type != TUNER_TER && type != TUNER_CBL && type != TUNER_ATSC)
                {
                        mp_verbose(log, "DVB_CONFIG, can't detect tuner type of card %d, skipping\n", i);
                        continue;
                }

        void *talloc_ctx = talloc_new(NULL);
        char *conf_file = NULL;
        if (priv->cfg_file && priv->cfg_file[0]) {
            conf_file = priv->cfg_file;
        } else {
            switch(type) {
            case TUNER_TER:
                conf_file = mp_find_config_file(talloc_ctx, global, "channels.conf.ter");
                break;
            case TUNER_CBL:
                conf_file = mp_find_config_file(talloc_ctx, global, "channels.conf.cbl");
                break;
            case TUNER_SAT:
                conf_file = mp_find_config_file(talloc_ctx, global, "channels.conf.sat");
                break;
            case TUNER_ATSC:
                conf_file = mp_find_config_file(talloc_ctx, global, "channels.conf.atsc");
                break;
            }
            if (conf_file) {
                mp_verbose(log, "Ignoring other channels.conf files.\n");
            } else {
                conf_file = mp_find_config_file(talloc_ctx, global, "channels.conf");
            }
        }

        list = dvb_get_channels(log, conf_file, type);
        talloc_free(talloc_ctx);

                if(list == NULL)
                        continue;

                size = sizeof(dvb_card_config_t) * (conf->count + 1);
                tmp = realloc(conf->cards, size);

                if(tmp == NULL)
                {
                        fprintf(stderr, "DVB_CONFIG, can't realloc %d bytes, skipping\n", size);
                        continue;
                }
                cards = tmp;

                name = malloc(20);
                if(name==NULL)
                {
                        fprintf(stderr, "DVB_CONFIG, can't realloc 20 bytes, skipping\n");
                        continue;
                }

                conf->cards = cards;
                conf->cards[conf->count].devno = i;
                conf->cards[conf->count].list = list;
                conf->cards[conf->count].type = type;
                snprintf(name, 20, "DVB-%c card n. %d", type==TUNER_TER ? 'T' : (type==TUNER_CBL ? 'C' : 'S'), conf->count+1);
                conf->cards[conf->count].name = name;
                conf->count++;
        }

        if(conf->count == 0)
        {
                free(conf);
                conf = NULL;
        }

        return conf;
}

static void *get_defaults(stream_t *st)
{
    return m_sub_options_copy(st, &stream_dvb_conf, st->opts->stream_dvb_opts);
}

const stream_info_t stream_info_dvb = {
    .name = "dvbin",
    .open = dvb_open,
    .protocols = (const char*const[]){ "dvb", NULL },
    .priv_size = sizeof(dvb_priv_t),
    .get_defaults = get_defaults,
    .options = stream_params,
    .url_options = (const char*const[]){
        "hostname=prog",
        "username=card",
        NULL
    },
};