mpv/stream/stream_pvr.c

/*
 * stream layer for hardware MPEG 1/2/4 encoders a.k.a PVR
 *  (such as WinTV PVR-150/250/350/500 (a.k.a IVTV), pvrusb2 and cx88)
 * See http://ivtvdriver.org/index.php/Main_Page for more details on the
 *  cards supported by the ivtv driver.
 *
 * Copyright (C) 2006 Benjamin Zores
 * Copyright (C) 2007 Sven Gothel (channel navigation)
 *
 * This file is part of MPlayer.
 *
 * MPlayer 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.
 *
 * MPlayer 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 MPlayer; 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 <unistd.h>
#include <string.h>
#include <sys/time.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <inttypes.h>
#include <poll.h>
#include <linux/videodev2.h>

#include <libavutil/common.h>
#include <libavutil/avstring.h>

#include "osdep/io.h"

#include "common/msg.h"
#include "options/options.h"

#include "stream.h"
#include "tv.h"
#include "frequencies.h"

#define PVR_DEFAULT_DEVICE "/dev/video0"
#define PVR_MAX_CONTROLS 10

/* logging mechanisms */
#define LOG_LEVEL_PVR  "[pvr]"
#define LOG_LEVEL_V4L2 "[v4l2]"
#define LOG_LEVEL_ENCODER "[encoder]"

/* audio codec mode */
#define PVR_AUDIO_MODE_ARG_STEREO                              "stereo"
#define PVR_AUDIO_MODE_ARG_JOINT_STEREO                        "joint_stereo"
#define PVR_AUDIO_MODE_ARG_DUAL                                "dual"
#define PVR_AUDIO_MODE_ARG_MONO                                "mono"

/* video codec bitrate mode */
#define PVR_VIDEO_BITRATE_MODE_ARG_VBR                         "vbr"
#define PVR_VIDEO_BITRATE_MODE_ARG_CBR                         "cbr"

/* video codec stream type */
#define PVR_VIDEO_STREAM_TYPE_PS                               "ps"
#define PVR_VIDEO_STREAM_TYPE_TS                               "ts"
#define PVR_VIDEO_STREAM_TYPE_MPEG1                            "mpeg1"
#define PVR_VIDEO_STREAM_TYPE_DVD                              "dvd"
#define PVR_VIDEO_STREAM_TYPE_VCD                              "vcd"
#define PVR_VIDEO_STREAM_TYPE_SVCD                             "svcd"

#define PVR_STATION_NAME_SIZE 256

/* command line arguments */
struct pvr_params {
    int aspect_ratio;
    int sample_rate;
    int audio_layer;
    int audio_bitrate;
    char *audio_mode;
    int bitrate;
    char *bitrate_mode;
    int bitrate_peak;
    char *stream_type;
};

#define OPT_BASE_STRUCT struct pvr_params
const struct m_sub_options stream_pvr_conf = {
    .opts = (const m_option_t[]) {
        OPT_INT("aspect", aspect_ratio, 0),
        OPT_INT("arate", sample_rate, 0),
        OPT_INT("alayer", audio_layer, 0),
        OPT_INT("abitrate", audio_bitrate, 0),
        OPT_STRING("amode", audio_mode, 0),
        OPT_INT("vbitrate", bitrate, 0),
        OPT_STRING("vmode", bitrate_mode, 0),
        OPT_INT("vpeak", bitrate_peak, 0),
        OPT_STRING("fmt", stream_type, 0),
        {0}
    },
    .size = sizeof(struct pvr_params),
};

#define BUFSTRCPY(d, s) av_strlcpy(d, s, sizeof(d))
#define BUFPRINTF(d, ...) snprintf(d, sizeof(d), __VA_ARGS__)

typedef struct station_elem_s {
  char name[PVR_STATION_NAME_SIZE];
  int freq;
  char station[PVR_STATION_NAME_SIZE];
  int enabled;
} station_elem_t;

typedef struct stationlist_s {
  char name[PVR_STATION_NAME_SIZE];
  station_elem_t *list;
  int total; /* total number */
  int used; /* used number */
  int enabled; /* enabled number */
} stationlist_t;

struct pvr_t {
  struct mp_log *log;
  tv_param_t *tv_params;
  struct pvr_params *params;
  int dev_fd;
  char *video_dev;
  int chantab;

  /* v4l2 params */
  int mute;
  int input;
  int normid;
  int brightness;
  int contrast;
  int hue;
  int saturation;
  int width;
  int height;
  int freq;
  int chan_idx;
  int chan_idx_last;
  stationlist_t stationlist;
  /* dups the tv_param_channel, or the url's channel param */
  char *param_channel;

  /* encoder params */
  int aspect;
  int samplerate;
  int layer;
  int audio_rate;
  int audio_mode;
  int bitrate;
  int bitrate_mode;
  int bitrate_peak;
  int stream_type;
};

static int pvr_stream_control(struct stream *s, int cmd, void *arg);

static struct pvr_t *
pvr_init (void)
{
  struct pvr_t *pvr = NULL;

  pvr = calloc (1, sizeof (struct pvr_t));
  pvr->dev_fd = -1;
  pvr->video_dev = strdup (PVR_DEFAULT_DEVICE);
  pvr->chantab = 5;

  /* v4l2 params */
  pvr->mute = 0;
  pvr->input = 0;
  pvr->normid = -1;
  pvr->brightness = 0;
  pvr->contrast = 0;
  pvr->hue = 0;
  pvr->saturation = 0;
  pvr->width = -1;
  pvr->height = -1;
  pvr->freq = -1;
  pvr->chan_idx = -1;
  pvr->chan_idx_last = -1;

  /* set default encoding settings
   * may be overlapped by user parameters
   * Use VBR MPEG_PS encoding at 6 Mbps (peak at 9.6 Mbps)
   * with 48 KHz L2 384 kbps audio.
   */
  pvr->aspect = V4L2_MPEG_VIDEO_ASPECT_4x3;
  pvr->samplerate = V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000;
  pvr->layer = V4L2_MPEG_AUDIO_ENCODING_LAYER_2;
  pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_384K;
  pvr->audio_mode = V4L2_MPEG_AUDIO_MODE_STEREO;
  pvr->bitrate = 6000000;
  pvr->bitrate_mode = V4L2_MPEG_VIDEO_BITRATE_MODE_VBR;
  pvr->bitrate_peak = 9600000;
  pvr->stream_type = V4L2_MPEG_STREAM_TYPE_MPEG2_PS;

  return pvr;
}

static void
pvr_uninit (struct pvr_t *pvr)
{
  if (!pvr)
    return;

  /* close device */
  if (pvr->dev_fd != -1)
    close (pvr->dev_fd);

  free (pvr->video_dev);
  free (pvr->stationlist.list);
  free (pvr->param_channel);
  free (pvr);
}

/**
 * @brief Copy Constructor for stationlist
 *
 * @see parse_setup_stationlist
 */
static int
copycreate_stationlist (struct pvr_t *pvr, stationlist_t *stationlist, int num)
{
  int i;

  if (pvr->chantab < 0 || !stationlist)
    return -1;

  num = FFMAX (num, chanlists[pvr->chantab].count);

  free (stationlist->list);
  stationlist->list = NULL;

  stationlist->total = 0;
  stationlist->enabled = 0;
  stationlist->used = 0;
  stationlist->list = calloc (num, sizeof (station_elem_t));

  if (!stationlist->list)
  {
    MP_ERR(pvr, "%s No memory allocated for station list, giving up\n",
            LOG_LEVEL_V4L2);
    return -1;
  }

  /* transport the channel list data to our extented struct */
  stationlist->total = num;
  BUFSTRCPY(stationlist->name, chanlists[pvr->chantab].name);

  for (i = 0; i < chanlists[pvr->chantab].count; i++)
  {
    stationlist->list[i].station[0]= '\0'; /* no station name yet */
    BUFSTRCPY(stationlist->list[i].name, chanlists[pvr->chantab].list[i].name);
    stationlist->list[i].freq = chanlists[pvr->chantab].list[i].freq;
    stationlist->list[i].enabled = 1; /* default enabled */
    stationlist->enabled++;
    stationlist->used++;
  }

  return 0;
}

static int
print_all_stations (struct pvr_t *pvr)
{
  int i;

  if (!pvr || !pvr->stationlist.list)
    return -1;

  for (i = 0; i < pvr->stationlist.total; i++)
  {
    MP_VERBOSE(pvr, "%s %3d: [%c] channel: %8s - freq: %8d - station: %s\n",
            LOG_LEVEL_V4L2, i, (pvr->stationlist.list[i].enabled) ? 'X' : ' ',
            pvr->stationlist.list[i].name, pvr->stationlist.list[i].freq,
            pvr->stationlist.list[i].station);
  }

  return 0;
}

/**
 * Disables all stations
 *
 * @see parse_setup_stationlist
 */
static void
disable_all_stations (struct pvr_t *pvr)
{
  int i;

  for (i = 0; i < pvr->stationlist.total; i++)
    pvr->stationlist.list[i].enabled = 0;
  pvr->stationlist.enabled = 0;
}

/**
 * Update or add a station
 *
 * @see parse_setup_stationlist
 */
static int
set_station (struct pvr_t *pvr, const char *station,
             const char *channel, int freq)
{
  int i;

  if (!pvr || !pvr->stationlist.list)
    return -1;

  if (0 >= pvr->stationlist.total || (!channel && !freq))
    return -1;

  /* select channel */
  for (i = 0; i < pvr->stationlist.used; i++)
  {
    if (channel && !strcasecmp (pvr->stationlist.list[i].name, channel))
      break; /* found existing channel entry */

    if (freq > 0 && pvr->stationlist.list[i].freq == freq)
      break; /* found existing frequency entry */
  }

  if (i < pvr->stationlist.used)
  {
    /**
     * found an existing entry,
     * which is about to change with the user data.
     * it is also enabled ..
     */
    if (!pvr->stationlist.list[i].enabled)
    {
      pvr->stationlist.list[i].enabled = 1;
      pvr->stationlist.enabled++;
    }

    if (station)
      BUFSTRCPY(pvr->stationlist.list[i].station, station);
    else if (channel)
      BUFSTRCPY(pvr->stationlist.list[i].station, channel);
    else
      BUFPRINTF(pvr->stationlist.list[i].station, "F %d", freq);

    MP_DBG(pvr, "%s Set user station channel: %8s - freq: %8d - station: %s\n",
            LOG_LEVEL_V4L2, pvr->stationlist.list[i].name,
            pvr->stationlist.list[i].freq,
            pvr->stationlist.list[i].station);
    return 0;
  }

  /* from here on, we have to create a new entry, frequency is mandatory */
  if (freq < 0)
  {
    MP_ERR(pvr, "%s Cannot add new station/channel without frequency\n",
            LOG_LEVEL_V4L2);
    return -1;
  }

  if (pvr->stationlist.total < i)
  {
    /**
     * we have to extend the stationlist about
     * an arbitrary size, even though this path is not performance critical
     */
    pvr->stationlist.total += 10;
    pvr->stationlist.list =
      realloc (pvr->stationlist.list,
               pvr->stationlist.total * sizeof (station_elem_t));

    if (!pvr->stationlist.list)
    {
      MP_ERR(pvr, "%s No memory allocated for station list, giving up\n",
              LOG_LEVEL_V4L2);
      return -1;
    }

    /* clear the new space ..*/
    memset (&(pvr->stationlist.list[pvr->stationlist.used]), 0,
            (pvr->stationlist.total - pvr->stationlist.used)
            * sizeof (station_elem_t));
  }

  /* here we go, our actual new entry */
  pvr->stationlist.used++;
  pvr->stationlist.list[i].enabled = 1;
  pvr->stationlist.enabled++;

  if (station)
    BUFSTRCPY(pvr->stationlist.list[i].station, station);
  if (channel)
    BUFSTRCPY(pvr->stationlist.list[i].name, channel);
  else
    BUFPRINTF(pvr->stationlist.list[i].name, "F %d", freq);

  pvr->stationlist.list[i].freq = freq;

  MP_DBG(pvr, "%s Add user station channel: %8s - freq: %8d - station: %s\n",
          LOG_LEVEL_V4L2, pvr->stationlist.list[i].name,
          pvr->stationlist.list[i].freq,
          pvr->stationlist.list[i].station);

  return 0;
}

/**
 * Here we set our stationlist, as follow
 *  - choose the frequency channel table, e.g. ntsc-cable
 *  - create our stationlist, same element size as the channellist
 *  - copy the channellist content to our stationlist
 *  - IF the user provides his channel-mapping, THEN:
 *    - disable all stations
 *    - update and/or create entries in the stationlist and enable them
 */
static int
parse_setup_stationlist (struct pvr_t *pvr)
{
  int i;

  if (!pvr)
    return -1;

  /* Create our station/channel list */
  if (pvr->tv_params->chanlist)
  {
    /* select channel list */
    for (i = 0; chanlists[i].name != NULL; i++)
    {
      if (!strcasecmp (chanlists[i].name, pvr->tv_params->chanlist))
      {
        pvr->chantab = i;
        break;
      }
    }
    if (!chanlists[i].name)
    {
      MP_ERR(pvr, "%s unable to find channel list %s, using default %s\n",
              LOG_LEVEL_V4L2, pvr->tv_params->chanlist, chanlists[pvr->chantab].name);
    }
    else
    {
      MP_INFO(pvr, "%s select channel list %s, entries %d\n", LOG_LEVEL_V4L2,
              chanlists[pvr->chantab].name, chanlists[pvr->chantab].count);
    }
  }

  if (0 > pvr->chantab)
  {
    MP_FATAL(pvr, "%s No channel list selected, giving up\n", LOG_LEVEL_V4L2);
    return -1;
  }

  if (copycreate_stationlist (pvr,&(pvr->stationlist), -1) < 0)
  {
    MP_FATAL(pvr, "%s No memory allocated for station list, giving up\n",
            LOG_LEVEL_V4L2);
    return -1;
  }

  /* Handle user channel mappings */
  if (pvr->tv_params->channels)
  {
    char channel[PVR_STATION_NAME_SIZE];
    char station[PVR_STATION_NAME_SIZE];
    char **channels = pvr->tv_params->channels;

    disable_all_stations (pvr);

    while (*channels)
    {
      char *tmp = *(channels++);
      char *sep = strchr (tmp, '-');
      int freq=-1;

      if (!sep)
        continue; /* Wrong syntax, but mplayer should not crash */

      BUFSTRCPY(station, sep + 1);

      sep[0] = '\0';
      BUFSTRCPY(channel, tmp);

      while ((sep = strchr (station, '_')))
        sep[0] = ' ';

      /* if channel number is a number and larger than 1000 treat it as
       * frequency tmp still contain pointer to null-terminated string with
       * channel number here
       */
      if ((freq = atoi (channel)) <= 1000)
        freq = -1;

      if (set_station (pvr, station, (freq <= 0) ? channel : NULL, freq) < 0)
      {
        MP_ERR(pvr, "%s Unable to set user station channel: %8s - freq: %8d - station: %s\n", LOG_LEVEL_V4L2,
                channel, freq, station);
      }
    }
  }

  return print_all_stations (pvr);
}

static int
get_v4l2_freq (struct pvr_t *pvr)
{
  int freq;
  struct v4l2_frequency vf;
  struct v4l2_tuner vt;

  if (!pvr)
    return -1;

  if (pvr->dev_fd < 0)
    return -1;

  memset (&vt, 0, sizeof (vt));
  memset (&vf, 0, sizeof (vf));

  if (ioctl (pvr->dev_fd, VIDIOC_G_TUNER, &vt) < 0)
  {
    MP_ERR(pvr, "%s can't set tuner (%s).\n",
            LOG_LEVEL_V4L2, strerror (errno));
    return -1;
  }

  if (ioctl (pvr->dev_fd, VIDIOC_G_FREQUENCY, &vf) < 0)
  {
    MP_ERR(pvr, "%s can't get frequency %d.\n",
            LOG_LEVEL_V4L2, errno);
    return -1;
  }
  freq = vf.frequency;
  if (!(vt.capability & V4L2_TUNER_CAP_LOW))
    freq *= 1000;
  freq /= 16;

  return freq;
}

static int
set_v4l2_freq (struct pvr_t *pvr)
{
  struct v4l2_frequency vf;
  struct v4l2_tuner vt;

  if (!pvr)
    return -1;

  if (0 >= pvr->freq)
  {
    MP_ERR(pvr, "%s Frequency invalid %d !!!\n", LOG_LEVEL_V4L2, pvr->freq);
    return -1;
  }

  /* don't set the frequency, if it's already set.
   * setting it here would interrupt the stream.
   */
  if (get_v4l2_freq (pvr) == pvr->freq)
  {
    MP_INFO(pvr, "%s Frequency %d already set.\n", LOG_LEVEL_V4L2, pvr->freq);
    return 0;
  }

  if (pvr->dev_fd < 0)
    return -1;

  memset (&vf, 0, sizeof (vf));
  memset (&vt, 0, sizeof (vt));

  if (ioctl (pvr->dev_fd, VIDIOC_G_TUNER, &vt) < 0)
  {
    MP_ERR(pvr, "%s can't get tuner (%s).\n",
            LOG_LEVEL_V4L2, strerror (errno));
    return -1;
  }

  vf.type = vt.type;
  vf.frequency = pvr->freq * 16;

  if (!(vt.capability & V4L2_TUNER_CAP_LOW))
    vf.frequency /= 1000;

  if (ioctl (pvr->dev_fd, VIDIOC_S_FREQUENCY, &vf) < 0)
  {
    MP_ERR(pvr, "%s can't set frequency (%s).\n",
            LOG_LEVEL_V4L2, strerror (errno));
    return -1;
  }

  memset (&vt, 0, sizeof(vt));
  if (ioctl (pvr->dev_fd, VIDIOC_G_TUNER, &vt) < 0)
  {
    MP_ERR(pvr, "%s can't set tuner (%s).\n",
            LOG_LEVEL_V4L2, strerror (errno));
    return -1;
  }

  /* just a notification */
  if (!vt.signal)
    MP_ERR(pvr, "%s NO SIGNAL at frequency %d (%d)\n",
            LOG_LEVEL_V4L2, pvr->freq, vf.frequency);
  else
    MP_INFO(pvr, "%s Got signal at frequency %d (%d)\n",
            LOG_LEVEL_V4L2, pvr->freq, vf.frequency);

  return 0;
}

static int
set_station_by_step (struct pvr_t *pvr, int step, int v4lAction)
{
  if (!pvr || !pvr->stationlist.list)
    return -1;

  if (pvr->stationlist.enabled >= abs (step))
  {
    int gotcha = 0;
    int chidx = pvr->chan_idx + step;

    while (!gotcha)
    {
      chidx = (chidx + pvr->stationlist.used) % pvr->stationlist.used;

      MP_DBG(pvr, "%s Offset switch: current %d, enabled %d, step %d -> %d\n",
              LOG_LEVEL_V4L2, pvr->chan_idx,
              pvr->stationlist.enabled, step, chidx);

      if (!pvr->stationlist.list[chidx].enabled)
      {
        MP_DBG(pvr, "%s Switch disabled to user station channel: %8s - freq: %8d - station: %s\n", LOG_LEVEL_V4L2,
                pvr->stationlist.list[chidx].name,
                pvr->stationlist.list[chidx].freq,
                pvr->stationlist.list[chidx].station);
        chidx += FFSIGN (step);
      }
      else
        gotcha = 1;
    }

    pvr->freq = pvr->stationlist.list[chidx].freq;
    pvr->chan_idx_last = pvr->chan_idx;
    pvr->chan_idx = chidx;

    MP_INFO(pvr, "%s Switch to user station channel: %8s - freq: %8d - station: %s\n", LOG_LEVEL_V4L2,
            pvr->stationlist.list[chidx].name,
            pvr->stationlist.list[chidx].freq,
            pvr->stationlist.list[chidx].station);

    if (v4lAction)
      return set_v4l2_freq (pvr);

    return (pvr->freq > 0) ? 0 : -1;
  }

  MP_ERR(pvr, "%s Ooops couldn't set freq by channel entry step %d to current %d, enabled %d\n", LOG_LEVEL_V4L2,
          step, pvr->chan_idx, pvr->stationlist.enabled);

  return -1;
}

static int
set_station_by_channelname_or_freq (struct pvr_t *pvr, const char *channel,
                                    int freq, int v4lAction)
{
  int i = 0;

  if (!pvr || !pvr->stationlist.list)
    return -1;

  if (0 >= pvr->stationlist.enabled)
  {
    MP_WARN(pvr, "%s No enabled station, cannot switch channel/frequency\n",
            LOG_LEVEL_V4L2);
    return -1;
  }

  if (channel)
  {
    /* select by channel */
    for (i = 0; i < pvr->stationlist.used ; i++)
    {
      if (!strcasecmp (pvr->stationlist.list[i].name, channel))
      {
        if (!pvr->stationlist.list[i].enabled)
        {
          MP_WARN(pvr, "%s Switch disabled to user station channel: %8s - freq: %8d - station: %s\n", LOG_LEVEL_V4L2,
                  pvr->stationlist.list[i].name,
                  pvr->stationlist.list[i].freq,
                  pvr->stationlist.list[i].station);

          return -1;
        }

        pvr->freq = pvr->stationlist.list[i].freq;
        pvr->chan_idx_last = pvr->chan_idx;
        pvr->chan_idx = i;
        break;
      }
    }
  }
  else if (freq >= 0)
  {
    /* select by freq */
    for (i = 0; i < pvr->stationlist.used; i++)
    {
      if (pvr->stationlist.list[i].freq == freq)
      {
        if (!pvr->stationlist.list[i].enabled)
        {
          MP_WARN(pvr, "%s Switch disabled to user station channel: %8s - freq: %8d - station: %s\n", LOG_LEVEL_V4L2,
                  pvr->stationlist.list[i].name,
                  pvr->stationlist.list[i].freq,
                  pvr->stationlist.list[i].station);

          return -1;
        }

        pvr->freq = pvr->stationlist.list[i].freq;
        pvr->chan_idx_last = pvr->chan_idx;
        pvr->chan_idx = i;
        break;
      }
    }
  }

  if (i >= pvr->stationlist.used)
  {
    if (channel)
      MP_WARN(pvr, "%s unable to find channel %s\n", LOG_LEVEL_V4L2, channel);
    else
      MP_WARN(pvr, "%s unable to find frequency %d\n", LOG_LEVEL_V4L2, freq);
    return -1;
  }

  MP_INFO(pvr, "%s Switch to user station channel: %8s - freq: %8d - station: %s\n", LOG_LEVEL_V4L2,
          pvr->stationlist.list[i].name,
          pvr->stationlist.list[i].freq,
          pvr->stationlist.list[i].station);

  if (v4lAction)
    return set_v4l2_freq (pvr);

  return (pvr->freq > 0) ? 0 : -1;
}

static void
parse_encoder_options (struct pvr_t *pvr)
{
  if (!pvr)
    return;

  /* -pvr aspect=digit */
  if (pvr->params->aspect_ratio >= 0 && pvr->params->aspect_ratio <= 3)
    pvr->aspect = pvr->params->aspect_ratio;

  /* -pvr arate=x */
  if (pvr->params->sample_rate != 0)
  {
    switch (pvr->params->sample_rate)
    {
    case 32000:
      pvr->samplerate = V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000;
      break;
    case 44100:
      pvr->samplerate = V4L2_MPEG_AUDIO_SAMPLING_FREQ_44100;
      break;
    case 48000:
      pvr->samplerate = V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000;
      break;
    default:
      break;
    }
  }

  /* -pvr alayer=x */
  if (pvr->params->audio_layer == 1)
    pvr->layer = V4L2_MPEG_AUDIO_ENCODING_LAYER_1;
  else if (pvr->params->audio_layer == 2)
    pvr->layer = V4L2_MPEG_AUDIO_ENCODING_LAYER_2;
  else if (pvr->params->audio_layer == 3)
    pvr->layer = V4L2_MPEG_AUDIO_ENCODING_LAYER_3;

  /* -pvr abitrate=x */
  if (pvr->params->audio_bitrate != 0)
  {
    if (pvr->layer == V4L2_MPEG_AUDIO_ENCODING_LAYER_1)
    {
      switch (pvr->params->audio_bitrate)
      {
      case 32:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_32K;
        break;
      case 64:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_64K;
        break;
      case 96:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_96K;
        break;
      case 128:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_128K;
        break;
      case 160:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_160K;
        break;
      case 192:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_192K;
        break;
      case 224:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_224K;
        break;
      case 256:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_256K;
        break;
      case 288:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_288K;
        break;
      case 320:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_320K;
        break;
      case 352:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_352K;
        break;
      case 384:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_384K;
        break;
      case 416:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_416K;
        break;
      case 448:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L1_BITRATE_448K;
        break;
      default:
        break;
      }
    }

    else if (pvr->layer == V4L2_MPEG_AUDIO_ENCODING_LAYER_2)
    {
      switch (pvr->params->audio_bitrate)
      {
      case 32:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_32K;
        break;
      case 48:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_48K;
        break;
      case 56:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_56K;
        break;
      case 64:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_64K;
        break;
      case 80:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_80K;
        break;
      case 96:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_96K;
        break;
      case 112:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_112K;
        break;
      case 128:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_128K;
        break;
      case 160:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_160K;
        break;
      case 192:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_192K;
        break;
      case 224:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_224K;
        break;
      case 256:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_256K;
        break;
      case 320:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_320K;
        break;
      case 384:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L2_BITRATE_384K;
        break;
      default:
        break;
      }
    }

    else if (pvr->layer == V4L2_MPEG_AUDIO_ENCODING_LAYER_3)
    {
      switch (pvr->params->audio_bitrate)
      {
      case 32:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_32K;
        break;
      case 40:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_40K;
        break;
      case 48:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_48K;
        break;
      case 56:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_56K;
        break;
      case 64:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_64K;
        break;
      case 80:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_80K;
        break;
      case 96:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_96K;
        break;
      case 112:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_112K;
        break;
      case 128:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_128K;
        break;
      case 160:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_160K;
        break;
      case 192:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_192K;
        break;
      case 224:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_224K;
        break;
      case 256:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_256K;
        break;
      case 320:
        pvr->audio_rate = V4L2_MPEG_AUDIO_L3_BITRATE_320K;
        break;
      default:
        break;
      }
    }
  }

  /* -pvr amode=x */
  if (pvr->params->audio_mode)
  {
    if (!strcmp (pvr->params->audio_mode, PVR_AUDIO_MODE_ARG_STEREO))
      pvr->audio_mode = V4L2_MPEG_AUDIO_MODE_STEREO;
    else if (!strcmp (pvr->params->audio_mode, PVR_AUDIO_MODE_ARG_JOINT_STEREO))
      pvr->audio_mode = V4L2_MPEG_AUDIO_MODE_JOINT_STEREO;
    else if (!strcmp (pvr->params->audio_mode, PVR_AUDIO_MODE_ARG_DUAL))
      pvr->audio_mode = V4L2_MPEG_AUDIO_MODE_DUAL;
    else if (!strcmp (pvr->params->audio_mode, PVR_AUDIO_MODE_ARG_MONO))
      pvr->audio_mode = V4L2_MPEG_AUDIO_MODE_MONO;
  }

  /* -pvr vbitrate=x */
  if (pvr->params->bitrate)
    pvr->bitrate = pvr->params->bitrate;

  /* -pvr vmode=x */
  if (pvr->params->bitrate_mode)
  {
    if (!strcmp (pvr->params->bitrate_mode, PVR_VIDEO_BITRATE_MODE_ARG_VBR))
      pvr->bitrate_mode = V4L2_MPEG_VIDEO_BITRATE_MODE_VBR;
    else if (!strcmp (pvr->params->bitrate_mode, PVR_VIDEO_BITRATE_MODE_ARG_CBR))
      pvr->bitrate_mode = V4L2_MPEG_VIDEO_BITRATE_MODE_CBR;
  }

  /* -pvr vpeak=x */
  if (pvr->params->bitrate_peak)
    pvr->bitrate_peak = pvr->params->bitrate_peak;

  /* -pvr fmt=x */
  if (pvr->params->stream_type)
  {
    if (!strcmp (pvr->params->stream_type, PVR_VIDEO_STREAM_TYPE_PS))
      pvr->stream_type = V4L2_MPEG_STREAM_TYPE_MPEG2_PS;
    else if (!strcmp (pvr->params->stream_type, PVR_VIDEO_STREAM_TYPE_TS))
      pvr->stream_type = V4L2_MPEG_STREAM_TYPE_MPEG2_TS;
    else if (!strcmp (pvr->params->stream_type, PVR_VIDEO_STREAM_TYPE_MPEG1))
      pvr->stream_type = V4L2_MPEG_STREAM_TYPE_MPEG1_SS;
    else if (!strcmp (pvr->params->stream_type, PVR_VIDEO_STREAM_TYPE_DVD))
      pvr->stream_type = V4L2_MPEG_STREAM_TYPE_MPEG2_DVD;
    else if (!strcmp (pvr->params->stream_type, PVR_VIDEO_STREAM_TYPE_VCD))
      pvr->stream_type = V4L2_MPEG_STREAM_TYPE_MPEG1_VCD;
    else if (!strcmp (pvr->params->stream_type, PVR_VIDEO_STREAM_TYPE_SVCD))
      pvr->stream_type = V4L2_MPEG_STREAM_TYPE_MPEG2_SVCD;
  }
}

static void
add_v4l2_ext_control (struct v4l2_ext_control *ctrl,
                      uint32_t id, int32_t value)
{
  ctrl->id = id;
  ctrl->value = value;
}

static int
set_encoder_settings (struct pvr_t *pvr)
{
  struct v4l2_ext_control *ext_ctrl = NULL;
  struct v4l2_ext_controls ctrls;
  uint32_t count = 0;

  if (!pvr)
    return -1;

  if (pvr->dev_fd < 0)
    return -1;

  ext_ctrl = (struct v4l2_ext_control *)
    malloc (PVR_MAX_CONTROLS * sizeof (struct v4l2_ext_control));

  add_v4l2_ext_control (&ext_ctrl[count++], V4L2_CID_MPEG_VIDEO_ASPECT,
                        pvr->aspect);

  add_v4l2_ext_control (&ext_ctrl[count++], V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ,
                        pvr->samplerate);

  add_v4l2_ext_control (&ext_ctrl[count++], V4L2_CID_MPEG_AUDIO_ENCODING,
                        pvr->layer);

  switch (pvr->layer)
  {
  case V4L2_MPEG_AUDIO_ENCODING_LAYER_1:
    add_v4l2_ext_control (&ext_ctrl[count++], V4L2_CID_MPEG_AUDIO_L1_BITRATE,
                          pvr->audio_rate);
    break;
  case V4L2_MPEG_AUDIO_ENCODING_LAYER_2:
    add_v4l2_ext_control (&ext_ctrl[count++], V4L2_CID_MPEG_AUDIO_L2_BITRATE,
                          pvr->audio_rate);
    break;
  case V4L2_MPEG_AUDIO_ENCODING_LAYER_3:
    add_v4l2_ext_control (&ext_ctrl[count++], V4L2_CID_MPEG_AUDIO_L3_BITRATE,
                          pvr->audio_rate);
    break;
  default:
    break;
  }

  add_v4l2_ext_control (&ext_ctrl[count++], V4L2_CID_MPEG_AUDIO_MODE,
                        pvr->audio_mode);

  add_v4l2_ext_control (&ext_ctrl[count++], V4L2_CID_MPEG_VIDEO_BITRATE,
                        pvr->bitrate);

  add_v4l2_ext_control (&ext_ctrl[count++], V4L2_CID_MPEG_VIDEO_BITRATE_PEAK,
                        pvr->bitrate_peak);

  add_v4l2_ext_control (&ext_ctrl[count++], V4L2_CID_MPEG_VIDEO_BITRATE_MODE,
                        pvr->bitrate_mode);

  add_v4l2_ext_control (&ext_ctrl[count++], V4L2_CID_MPEG_STREAM_TYPE,
                        pvr->stream_type);

  /* set new encoding settings */
  ctrls.ctrl_class = V4L2_CTRL_CLASS_MPEG;
  ctrls.count = count;
  ctrls.controls = ext_ctrl;

  if (ioctl (pvr->dev_fd, VIDIOC_S_EXT_CTRLS, &ctrls) < 0)
  {
    MP_ERR(pvr, "%s Error setting MPEG controls (%s).\n",
            LOG_LEVEL_ENCODER, strerror (errno));
    free (ext_ctrl);
    return -1;
  }

  free (ext_ctrl);

  return 0;
}

static void
parse_v4l2_tv_options (struct pvr_t *pvr)
{
  if (!pvr)
    return;

  /* Create our station/channel list */
  parse_setup_stationlist (pvr);

  if (pvr->param_channel)
  {
    if (set_station_by_channelname_or_freq (pvr, pvr->param_channel,
                                            -1, 0) >= 0)
    {
      if (pvr->tv_params->freq)
      {
        MP_INFO(pvr, "%s tv param freq %s is overwritten by channel setting freq %d\n", LOG_LEVEL_V4L2,
                pvr->tv_params->freq, pvr->freq);
      }
    }
  }

  if (pvr->freq < 0 && pvr->tv_params->freq)
  {
    MP_INFO(pvr, "%s tv param freq %s is used directly\n",
            LOG_LEVEL_V4L2, pvr->tv_params->freq);

    if (set_station_by_channelname_or_freq (pvr, NULL,
                                            atoi (pvr->tv_params->freq), 0)<0)
      {
        MP_WARN(pvr, "%s tv param freq %s invalid to set station\n",
                LOG_LEVEL_V4L2, pvr->tv_params->freq);
      }
  }

  if (pvr->tv_params->device)
  {
    free (pvr->video_dev);
    pvr->video_dev = strdup (pvr->tv_params->device);
  }

  if (!pvr->tv_params->audio)
    pvr->mute = !pvr->tv_params->audio;

  if (pvr->tv_params->input)
    pvr->input = pvr->tv_params->input;

  if (pvr->tv_params->normid)
    pvr->normid = pvr->tv_params->normid;

  if (pvr->tv_params->brightness)
    pvr->brightness = pvr->tv_params->brightness;

  if (pvr->tv_params->contrast)
    pvr->contrast = pvr->tv_params->contrast;

  if (pvr->tv_params->hue)
    pvr->hue = pvr->tv_params->hue;

  if (pvr->tv_params->saturation)
    pvr->saturation = pvr->tv_params->saturation;

  if (pvr->tv_params->width)
    pvr->width = pvr->tv_params->width;

  if (pvr->tv_params->height)
    pvr->height = pvr->tv_params->height;
}

static int
set_v4l2_settings (struct pvr_t *pvr)
{
  if (!pvr)
    return -1;

  if (pvr->dev_fd < 0)
    return -1;

  /* -tv noaudio */
  if (pvr->mute)
  {
    struct v4l2_control ctrl;
    ctrl.id = V4L2_CID_AUDIO_MUTE;
    ctrl.value = 1;
    if (ioctl (pvr->dev_fd, VIDIOC_S_CTRL, &ctrl) < 0)
    {
      MP_ERR(pvr, "%s can't mute (%s).\n", LOG_LEVEL_V4L2, strerror (errno));
      return -1;
    }
  }

  /* -tv input=x */
  if (pvr->input != 0)
  {
    if (ioctl (pvr->dev_fd, VIDIOC_S_INPUT, &pvr->input) < 0)
    {
      MP_ERR(pvr, "%s can't set input (%s)\n", LOG_LEVEL_V4L2, strerror (errno));
      return -1;
    }
  }

  /* -tv normid=x */
  if (pvr->normid != -1)
  {
    struct v4l2_standard std;
    std.index = pvr->normid;

    if (ioctl (pvr->dev_fd, VIDIOC_ENUMSTD, &std) < 0)
    {
      MP_ERR(pvr, "%s can't set norm (%s)\n", LOG_LEVEL_V4L2, strerror (errno));
      return -1;
    }

    MP_VERBOSE(pvr, "%s set norm to %s\n", LOG_LEVEL_V4L2, std.name);

    if (ioctl (pvr->dev_fd, VIDIOC_S_STD, &std.id) < 0)
    {
      MP_ERR(pvr, "%s can't set norm (%s)\n", LOG_LEVEL_V4L2, strerror (errno));
      return -1;
    }
  }

  /* -tv brightness=x */
  if (pvr->brightness != 0)
  {
    struct v4l2_control ctrl;
    ctrl.id = V4L2_CID_BRIGHTNESS;
    ctrl.value = pvr->brightness;

    if (ctrl.value < 0)
      ctrl.value = 0;
    if (ctrl.value > 255)
      ctrl.value = 255;

    if (ioctl (pvr->dev_fd, VIDIOC_S_CTRL, &ctrl) < 0)
    {
      MP_ERR(pvr, "%s can't set brightness to %d (%s).\n",
              LOG_LEVEL_V4L2, ctrl.value, strerror (errno));
      return -1;
    }
  }

  /* -tv contrast=x */
  if (pvr->contrast != 0)
  {
    struct v4l2_control ctrl;
    ctrl.id = V4L2_CID_CONTRAST;
    ctrl.value = pvr->contrast;

    if (ctrl.value < 0)
      ctrl.value = 0;
    if (ctrl.value > 127)
      ctrl.value = 127;

    if (ioctl (pvr->dev_fd, VIDIOC_S_CTRL, &ctrl) < 0)
    {
      MP_ERR(pvr, "%s can't set contrast to %d (%s).\n",
              LOG_LEVEL_V4L2, ctrl.value, strerror (errno));
      return -1;
    }
  }

  /* -tv hue=x */
  if (pvr->hue != 0)
  {
    struct v4l2_control ctrl;
    ctrl.id = V4L2_CID_HUE;
    ctrl.value = pvr->hue;

    if (ctrl.value < -128)
      ctrl.value = -128;
    if (ctrl.value > 127)
      ctrl.value = 127;

    if (ioctl (pvr->dev_fd, VIDIOC_S_CTRL, &ctrl) < 0)
    {
      MP_ERR(pvr, "%s can't set hue to %d (%s).\n",
              LOG_LEVEL_V4L2, ctrl.value, strerror (errno));
      return -1;
    }
  }

  /* -tv saturation=x */
  if (pvr->saturation != 0)
  {
    struct v4l2_control ctrl;
    ctrl.id = V4L2_CID_SATURATION;
    ctrl.value = pvr->saturation;

    if (ctrl.value < 0)
      ctrl.value = 0;
    if (ctrl.value > 127)
      ctrl.value = 127;

    if (ioctl (pvr->dev_fd, VIDIOC_S_CTRL, &ctrl) < 0)
    {
      MP_ERR(pvr, "%s can't set saturation to %d (%s).\n",
              LOG_LEVEL_V4L2, ctrl.value, strerror (errno));
      return -1;
    }
  }

  /* -tv width=x:height=y */
  if (pvr->width && pvr->height)
  {
    struct v4l2_format vfmt;
    vfmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    vfmt.fmt.pix.width = pvr->width;
    vfmt.fmt.pix.height = pvr->height;

    if (ioctl (pvr->dev_fd, VIDIOC_S_FMT, &vfmt) < 0)
    {
      MP_ERR(pvr, "%s can't set resolution to %dx%d (%s).\n",
              LOG_LEVEL_V4L2, pvr->width, pvr->height, strerror (errno));
      return -1;
    }
  }

  if (pvr->freq < 0)
  {
    int freq = get_v4l2_freq (pvr);
    MP_INFO(pvr, "%s Using current set frequency %d, to set channel\n",
            LOG_LEVEL_V4L2, freq);

    if (0 < freq)
      return set_station_by_channelname_or_freq (pvr, NULL, freq, 1);
  }

  if (0 < pvr->freq)
    return set_v4l2_freq (pvr) ;

  return 0;
}

static int
v4l2_list_capabilities (struct pvr_t *pvr)
{
  struct v4l2_audio vaudio;
  struct v4l2_standard vs;
  struct v4l2_input vin;
  int err = 0;

  if (!pvr)
    return -1;

  if (pvr->dev_fd < 0)
    return -1;

  /* list available video inputs */
  vin.index = 0;
  err = 1;
  MP_INFO(pvr, "%s Available video inputs: ", LOG_LEVEL_V4L2);
  while (ioctl (pvr->dev_fd, VIDIOC_ENUMINPUT, &vin) >= 0)
  {
    err = 0;
    MP_INFO(pvr, "'#%d, %s' ", vin.index, vin.name);
    vin.index++;
  }
  if (err)
  {
    MP_INFO(pvr, "none\n");
    return -1;
  }
  else
    MP_INFO(pvr, "\n");

  /* list available audio inputs */
  vaudio.index = 0;
  err = 1;
  MP_INFO(pvr, "%s Available audio inputs: ", LOG_LEVEL_V4L2);
  while (ioctl (pvr->dev_fd, VIDIOC_ENUMAUDIO, &vaudio) >= 0)
  {
    err = 0;
    MP_INFO(pvr, "'#%d, %s' ", vaudio.index, vaudio.name);
    vaudio.index++;
  }
  if (err)
  {
    MP_INFO(pvr, "none\n");
    return -1;
  }
  else
    MP_INFO(pvr, "\n");

  /* list available norms */
  vs.index = 0;
  MP_INFO(pvr, "%s Available norms: ", LOG_LEVEL_V4L2);
  while (ioctl (pvr->dev_fd, VIDIOC_ENUMSTD, &vs) >= 0)
  {
    err = 0;
    MP_INFO(pvr, "'#%d, %s' ", vs.index, vs.name);
    vs.index++;
  }
  if (err)
  {
    MP_INFO(pvr, "none\n");
    return -1;
  }
  else
    MP_INFO(pvr, "\n");

  return 0;
}

static int
v4l2_display_settings (struct pvr_t *pvr)
{
  struct v4l2_audio vaudio;
  struct v4l2_standard vs;
  struct v4l2_input vin;
  v4l2_std_id std;
  int input;

  if (!pvr)
    return -1;

  if (pvr->dev_fd < 0)
    return -1;

  /* get current video input */
  if (ioctl (pvr->dev_fd, VIDIOC_G_INPUT, &input) == 0)
  {
    vin.index = input;
    if (ioctl (pvr->dev_fd, VIDIOC_ENUMINPUT, &vin) < 0)
    {
      MP_ERR(pvr, "%s can't get input (%s).\n", LOG_LEVEL_V4L2, strerror (errno));
      return -1;
    }
    else
      MP_INFO(pvr, "%s Video input: %s\n", LOG_LEVEL_V4L2, vin.name);
  }
  else
  {
    MP_ERR(pvr, "%s can't get input (%s).\n", LOG_LEVEL_V4L2, strerror (errno));
    return -1;
  }

  /* get current audio input */
  if (ioctl (pvr->dev_fd, VIDIOC_G_AUDIO, &vaudio) == 0)
  {
    MP_INFO(pvr, "%s Audio input: %s\n", LOG_LEVEL_V4L2, vaudio.name);
  }
  else
  {
    MP_ERR(pvr, "%s can't get input (%s).\n", LOG_LEVEL_V4L2, strerror (errno));
    return -1;
  }

  /* get current video format */
  if (ioctl (pvr->dev_fd, VIDIOC_G_STD, &std) == 0)
  {
    vs.index = 0;

    while (ioctl (pvr->dev_fd, VIDIOC_ENUMSTD, &vs) >= 0)
    {
      if (vs.id == std)
      {
        MP_INFO(pvr, "%s Norm: %s.\n", LOG_LEVEL_V4L2, vs.name);
        break;
      }
      vs.index++;
    }
  }
  else
  {
    MP_ERR(pvr, "%s can't get norm (%s)\n", LOG_LEVEL_V4L2, strerror (errno));
    return -1;
  }

  return 0;
}

/* stream layer */

static void
pvr_stream_close (stream_t *stream)
{
  struct pvr_t *pvr;

  if (!stream)
    return;

  pvr = (struct pvr_t *) stream->priv;
  pvr_uninit (pvr);
}

static int
pvr_stream_read (stream_t *stream, char *buffer, int size)
{
  struct pollfd pfds[1];
  struct pvr_t *pvr;
  int rk, fd, pos;

  if (!stream || !buffer)
    return 0;

  pvr = (struct pvr_t *) stream->priv;
  fd = pvr->dev_fd;
  pos = 0;

  if (fd < 0)
    return 0;

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

    rk = size - pos;

    if (poll (pfds, 1, 500) <= 0)
    {
      MP_ERR(pvr, "%s failed with errno %d when reading %d bytes\n",
              LOG_LEVEL_PVR, errno, size-pos);
      break;
    }

    rk = read (fd, &buffer[pos], rk);
    if (rk > 0)
    {
      pos += rk;
      MP_TRACE(pvr, "%s read (%d) bytes\n", LOG_LEVEL_PVR, pos);
    }
  }

  if (!pos)
    MP_ERR(pvr, "%s read %d bytes\n", LOG_LEVEL_PVR, pos);

  return pos;
}

static int
pvr_stream_open (stream_t *stream)
{
  struct v4l2_capability vcap;
  struct v4l2_ext_controls ctrls;
  struct pvr_t *pvr = NULL;

  pvr = pvr_init ();
  pvr->tv_params = stream->opts->tv_params;
  pvr->log = stream->log;
  pvr->params = stream->opts->stream_pvr_opts;

  /**
   * if the url, i.e. 'pvr://8', contains the channel, use it,
   * else use the tv parameter.
   */
  if (stream->url && strlen (stream->url) > 6 && stream->url[6] != '\0')
    pvr->param_channel = strdup (stream->url + 6);
  else if (pvr->tv_params->channel && strlen (pvr->tv_params->channel))
    pvr->param_channel = strdup (pvr->tv_params->channel);

  parse_v4l2_tv_options (pvr);
  parse_encoder_options (pvr);

  /* open device */
  pvr->dev_fd = open (pvr->video_dev, O_RDWR | O_CLOEXEC);
  MP_INFO(pvr, "%s Using device %s\n", LOG_LEVEL_PVR, pvr->video_dev);
  if (pvr->dev_fd == -1)
  {
    MP_ERR(pvr, "%s error opening device %s\n", LOG_LEVEL_PVR, pvr->video_dev);
    pvr_uninit (pvr);
    return STREAM_ERROR;
  }

  /* query capabilities (i.e test V4L2 support) */
  if (ioctl (pvr->dev_fd, VIDIOC_QUERYCAP, &vcap) < 0)
  {
    MP_ERR(pvr, "%s device is not V4L2 compliant (%s).\n",
            LOG_LEVEL_PVR, strerror (errno));
    pvr_uninit (pvr);
    return STREAM_ERROR;
  }
  else
    MP_INFO(pvr, "%s Detected %s\n", LOG_LEVEL_PVR, vcap.card);

  /* check for a valid V4L2 capture device */
  if (!(vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
  {
    MP_ERR(pvr, "%s device is not a valid V4L2 capture device.\n",
            LOG_LEVEL_PVR);
    pvr_uninit (pvr);
    return STREAM_ERROR;
  }

  /* check for device hardware MPEG encoding capability */
  ctrls.ctrl_class = V4L2_CTRL_CLASS_MPEG;
  ctrls.count = 0;
  ctrls.controls = NULL;

  if (ioctl (pvr->dev_fd, VIDIOC_G_EXT_CTRLS, &ctrls) < 0)
  {
    MP_ERR(pvr, "%s device do not support MPEG input.\n", LOG_LEVEL_ENCODER);
    return STREAM_ERROR;
  }

  /* list V4L2 capabilities */
  if (v4l2_list_capabilities (pvr) == -1)
  {
    MP_ERR(pvr, "%s can't get v4l2 capabilities\n", LOG_LEVEL_PVR);
    pvr_uninit (pvr);
    return STREAM_ERROR;
  }

  /* apply V4L2 settings */
  if (set_v4l2_settings (pvr) == -1)
  {
    MP_ERR(pvr, "%s can't set v4l2 settings\n", LOG_LEVEL_PVR);
    pvr_uninit (pvr);
    return STREAM_ERROR;
  }

  /* apply encoder settings */
  if (set_encoder_settings (pvr) == -1)
  {
    MP_ERR(pvr, "%s can't set encoder settings\n", LOG_LEVEL_PVR);
    pvr_uninit (pvr);
    return STREAM_ERROR;
  }

  /* display current V4L2 settings */
  if (v4l2_display_settings (pvr) == -1)
  {
    MP_ERR(pvr, "%s can't get v4l2 settings\n", LOG_LEVEL_PVR);
    pvr_uninit (pvr);
    return STREAM_ERROR;
  }

  stream->priv = pvr;
  stream->fill_buffer = pvr_stream_read;
  stream->close = pvr_stream_close;
  stream->control = pvr_stream_control;

  return STREAM_OK;
}

/* PVR Public API access */

#if 0
static const char *
pvr_get_current_stationname (stream_t *stream)
{
  struct pvr_t *pvr;

  if (!stream || stream->type != STREAMTYPE_PVR)
    return NULL;

  pvr = (struct pvr_t *) stream->priv;

  if (pvr->stationlist.list &&
      pvr->stationlist.used > pvr->chan_idx &&
      pvr->chan_idx >= 0)
    return pvr->stationlist.list[pvr->chan_idx].station;

  return NULL;
}

static const char *
pvr_get_current_channelname (stream_t *stream)
{
  struct pvr_t *pvr = (struct pvr_t *) stream->priv;

  if (pvr->stationlist.list &&
      pvr->stationlist.used > pvr->chan_idx &&
      pvr->chan_idx >= 0)
    return pvr->stationlist.list[pvr->chan_idx].name;

  return NULL;
}
#endif

static int
pvr_get_current_frequency (stream_t *stream)
{
  struct pvr_t *pvr = (struct pvr_t *) stream->priv;

  return pvr->freq;
}

static int
pvr_set_channel (stream_t *stream, const char * channel)
{
  struct pvr_t *pvr = (struct pvr_t *) stream->priv;

  return set_station_by_channelname_or_freq (pvr, channel, -1, 1);
}

static int
pvr_set_lastchannel (stream_t *stream)
{
  struct pvr_t *pvr = (struct pvr_t *) stream->priv;

  if (pvr->stationlist.list &&
      pvr->stationlist.used > pvr->chan_idx_last &&
      pvr->chan_idx_last >= 0)
    return set_station_by_channelname_or_freq (pvr, pvr->stationlist.list[pvr->chan_idx_last].name, -1, 1);

  return -1;
}

static int
pvr_set_freq (stream_t *stream, int freq)
{
  struct pvr_t *pvr = (struct pvr_t *) stream->priv;

  return set_station_by_channelname_or_freq (pvr, NULL, freq, 1);
}

static int
pvr_set_channel_step (stream_t *stream, int step)
{
  struct pvr_t *pvr = (struct pvr_t *) stream->priv;

  return set_station_by_step (pvr, step, 1);
}

static int pvr_stream_control(struct stream *s, int cmd, void *arg)
{
    switch (cmd) {
    case STREAM_CTRL_SET_TV_FREQ:
        pvr_set_freq(s, (int)(*(float *)arg + 0.5f));
        return STREAM_OK;
    case STREAM_CTRL_GET_TV_FREQ:
        *(float *)arg = pvr_get_current_frequency(s);
        return STREAM_OK;
    case STREAM_CTRL_TV_SET_CHAN:
        pvr_set_channel(s, (char *)arg);
        return STREAM_OK;
    case STREAM_CTRL_TV_STEP_CHAN:
        pvr_set_channel_step(s, *(int *)arg);
        return STREAM_OK;
    case STREAM_CTRL_TV_LAST_CHAN:
        pvr_set_lastchannel(s);
        return STREAM_OK;
    }
    return STREAM_UNSUPPORTED;
}

const stream_info_t stream_info_pvr = {
    .name = "pvr",
    .open = pvr_stream_open,
    .protocols = (const char*const[]){ "pvr", NULL },
};