[vlc-devel] [PATCH 1/2] aout: send the preferred period delay to modules

Thomas Guillem thomas at gllm.fr
Mon Feb 11 16:59:53 CET 2019


On Mon, Feb 11, 2019, at 16:57, Rémi Denis-Courmont wrote:
> 	Hi,
> 
> The period is a feature of (most) hardware, and I'm not clear why the core 
> should know about it or even what would be the definition of "period hint". I 
> am also not clear what "period delay" means.

What about the jitter (or buffering) value  of the output clock ? It should be calculted from the period, no ? (2 times the period we agreed).

> 
> As far as I know, the core should know and tell:
> - the use case: demand vs live, interactive filtering or not...
> - the packetization time, if known and fixed,
> - the maximum allowed buffer, if any (only live and/or interactive use cases).
> 
> Le perjantaina 8. helmikuuta 2019, 9.09.14 EET Thomas Guillem a écrit :
> > ---
> >  include/vlc_aout.h                      | 10 +++++++++-
> >  modules/audio_output/adummy.c           |  5 +++--
> >  modules/audio_output/alsa.c             |  4 +++-
> >  modules/audio_output/amem.c             |  4 +++-
> >  modules/audio_output/audiotrack.c       |  6 ++++--
> >  modules/audio_output/audiounit_ios.m    |  4 +++-
> >  modules/audio_output/auhal.c            |  4 +++-
> >  modules/audio_output/directsound.c      |  3 ++-
> >  modules/audio_output/file.c             |  4 +++-
> >  modules/audio_output/jack.c             |  4 +++-
> >  modules/audio_output/kai.c              |  3 ++-
> >  modules/audio_output/mmdevice.c         |  4 +++-
> >  modules/audio_output/opensles_android.c |  4 +++-
> >  modules/audio_output/oss.c              |  4 +++-
> >  modules/audio_output/pulse.c            |  4 +++-
> >  modules/audio_output/sndio.c            |  3 ++-
> >  modules/audio_output/tizen_audio.c      |  4 +++-
> >  modules/audio_output/waveout.c          |  4 +++-
> >  modules/audio_output/winstore.c         |  4 +++-
> >  modules/video_output/decklink.cpp       |  4 +++-
> >  src/audio_output/output.c               |  3 ++-
> >  21 files changed, 66 insertions(+), 23 deletions(-)
> > 
> > diff --git a/include/vlc_aout.h b/include/vlc_aout.h
> > index 11209ee0ce..59f930221f 100644
> > --- a/include/vlc_aout.h
> > +++ b/include/vlc_aout.h
> > @@ -140,7 +140,8 @@ struct audio_output
> > 
> >      void *sys; /**< Private data for callbacks */
> > 
> > -    int (*start)(audio_output_t *, audio_sample_format_t *fmt);
> > +    int (*start)(audio_output_t *, audio_sample_format_t *fmt,
> > +                 vlc_tick_t *period_hint);
> >      /**< Starts a new stream (mandatory, cannot be NULL).
> >        *
> >        * This callback changes the audio output from stopped to playing
> > state @@ -149,6 +150,13 @@ struct audio_output
> >        *
> >        * \param fmt input stream sample format upon entry,
> >        *            output stream sample format upon return [IN/OUT]
> > +      *
> > +      * \param period_hint wanted period by the core. This value can be
> > +      * overwritten by the implementation if it's not possible to configure
> > +      * such period. A period corresponds to the amount of time the audio
> > +      * server will wait until the buffer is free enough to request more
> > data +      * [IN/OUT]
> > +      *
> >        * \return VLC_SUCCESS on success, non-zero on failure
> >        *
> >        * \note This callback can only be called while the audio output is in
> > diff --git a/modules/audio_output/adummy.c b/modules/audio_output/adummy.c
> > index d0889b8c08..64fce9a1b0 100644
> > --- a/modules/audio_output/adummy.c
> > +++ b/modules/audio_output/adummy.c
> > @@ -57,9 +57,10 @@ static void Flush(audio_output_t *aout, bool wait)
> >      (void) aout; (void) wait;
> >  }
> > 
> > -static int Start(audio_output_t *aout, audio_sample_format_t *restrict fmt)
> > +static int Start(audio_output_t *aout, audio_sample_format_t *restrict
> > fmt, +                 vlc_tick_t *period_hint)
> >  {
> > -    (void) aout;
> > +    (void) aout; (void) period;
> > 
> >      switch (fmt->i_format)
> >      {
> > diff --git a/modules/audio_output/alsa.c b/modules/audio_output/alsa.c
> > index 08067c1338..23b4e8d03a 100644
> > --- a/modules/audio_output/alsa.c
> > +++ b/modules/audio_output/alsa.c
> > @@ -297,7 +297,8 @@ static void PauseDummy (audio_output_t *, bool,
> > vlc_tick_t); static void Flush (audio_output_t *, bool);
> > 
> >  /** Initializes an ALSA playback stream */
> > -static int Start (audio_output_t *aout, audio_sample_format_t *restrict
> > fmt) +static int Start (audio_output_t *aout, audio_sample_format_t
> > *restrict fmt, +                  vlc_tick_t *period_hint)
> >  {
> >      aout_sys_t *sys = aout->sys;
> >      snd_pcm_format_t pcm_format; /* ALSA sample format */
> > @@ -627,6 +628,7 @@ static int Start (audio_output_t *aout,
> > audio_sample_format_t *restrict fmt) error:
> >      snd_pcm_close (pcm);
> >      return VLC_EGENERIC;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  static int TimeGet (audio_output_t *aout, vlc_tick_t *restrict delay)
> > diff --git a/modules/audio_output/amem.c b/modules/audio_output/amem.c
> > index dcba84c32d..c4106d7b82 100644
> > --- a/modules/audio_output/amem.c
> > +++ b/modules/audio_output/amem.c
> > @@ -184,7 +184,8 @@ static void Stop (audio_output_t *aout)
> >      vlc_mutex_unlock(&sys->lock);
> >  }
> > 
> > -static int Start (audio_output_t *aout, audio_sample_format_t *fmt)
> > +static int Start (audio_output_t *aout, audio_sample_format_t *fmt,
> > +                  vlc_tick_t *period_hint)
> >  {
> >      aout_sys_t *sys = aout->sys;
> >      char format[5] = "S16N";
> > @@ -265,6 +266,7 @@ static int Start (audio_output_t *aout,
> > audio_sample_format_t *fmt) fmt->i_format = VLC_CODEC_S16N;
> >      fmt->channel_type = AUDIO_CHANNEL_TYPE_BITMAP;
> >      return VLC_SUCCESS;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  static int Open (vlc_object_t *obj)
> > diff --git a/modules/audio_output/audiotrack.c
> > b/modules/audio_output/audiotrack.c index 8aef4aecfe..d0ddbda33d 100644
> > --- a/modules/audio_output/audiotrack.c
> > +++ b/modules/audio_output/audiotrack.c
> > @@ -43,7 +43,7 @@
> >  static int  Open( vlc_object_t * );
> >  static void Close( vlc_object_t * );
> >  static void Stop( audio_output_t * );
> > -static int Start( audio_output_t *, audio_sample_format_t * );
> > +static int Start( audio_output_t *, audio_sample_format_t *, vlc_tick_t *
> > ); static void *AudioTrack_Thread( void * );
> > 
> >  /* There is an undefined behavior when configuring AudioTrack with SPDIF or
> > @@ -1292,7 +1292,8 @@ StartPCM( JNIEnv *env, audio_output_t *p_aout,
> > unsigned i_max_channels ) }
> > 
> >  static int
> > -Start( audio_output_t *p_aout, audio_sample_format_t *restrict p_fmt )
> > +Start( audio_output_t *p_aout, audio_sample_format_t *restrict p_fmt,
> > +       vlc_tick_t *period_hint )
> >  {
> >      aout_sys_t *p_sys = p_aout->sys;
> >      JNIEnv *env;
> > @@ -1494,6 +1495,7 @@ Start( audio_output_t *p_aout, audio_sample_format_t
> > *restrict p_fmt ) error:
> >      Stop( p_aout );
> >      return VLC_EGENERIC;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  static void
> > diff --git a/modules/audio_output/audiounit_ios.m
> > b/modules/audio_output/audiounit_ios.m index e449f6e2eb..9f621564a2 100644
> > --- a/modules/audio_output/audiounit_ios.m
> > +++ b/modules/audio_output/audiounit_ios.m
> > @@ -477,7 +477,8 @@ Stop(audio_output_t *p_aout)
> >  }
> > 
> >  static int
> > -Start(audio_output_t *p_aout, audio_sample_format_t *restrict fmt)
> > +Start(audio_output_t *p_aout, audio_sample_format_t *restrict fmt,
> > +      vlc_tick_t *period_hint)
> >  {
> >      aout_sys_t *p_sys = p_aout->sys;
> >      OSStatus err;
> > @@ -580,6 +581,7 @@ error:
> >      [[NSNotificationCenter defaultCenter]
> > removeObserver:p_sys->aoutWrapper]; msg_Err(p_aout, "opening AudioUnit
> > output failed");
> >      return VLC_EGENERIC;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  static int DeviceSelect(audio_output_t *p_aout, const char *psz_id)
> > diff --git a/modules/audio_output/auhal.c b/modules/audio_output/auhal.c
> > index 8005e27954..8e4fdb7098 100644
> > --- a/modules/audio_output/auhal.c
> > +++ b/modules/audio_output/auhal.c
> > @@ -1496,7 +1496,8 @@ Stop(audio_output_t *p_aout)
> >  }
> > 
> >  static int
> > -Start(audio_output_t *p_aout, audio_sample_format_t *restrict fmt)
> > +Start(audio_output_t *p_aout, audio_sample_format_t *restrict fmt,
> > +      vlc_tick_t *period_hint)
> >  {
> >      UInt32                  i_param_size = 0;
> >      aout_sys_t              *p_sys = NULL;
> > @@ -1627,6 +1628,7 @@ Start(audio_output_t *p_aout, audio_sample_format_t
> > *restrict fmt) kAudioDevicePropertyDeviceIsAlive,
> >                        kAudioObjectPropertyScopeGlobal);
> >      return VLC_EGENERIC;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  static void Close(vlc_object_t *obj)
> > diff --git a/modules/audio_output/directsound.c
> > b/modules/audio_output/directsound.c index b3f3b130c5..103fb008a9 100644
> > --- a/modules/audio_output/directsound.c
> > +++ b/modules/audio_output/directsound.c
> > @@ -963,7 +963,7 @@ static int MuteSet( audio_output_t *p_aout, bool mute )
> >  }
> > 
> >  static int OutputStart( audio_output_t *p_aout,
> > -                        audio_sample_format_t *restrict fmt )
> > +                        audio_sample_format_t *restrict fmt, vlc_tick_t
> > *period_hint ) {
> >      msg_Dbg( p_aout, "Opening DirectSound Audio Output" );
> > 
> > @@ -990,6 +990,7 @@ static int OutputStart( audio_output_t *p_aout,
> >      p_aout->flush = OutputFlush;
> > 
> >      return 0;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  typedef struct
> > diff --git a/modules/audio_output/file.c b/modules/audio_output/file.c
> > index fbdf35fcb1..274b6a6f15 100644
> > --- a/modules/audio_output/file.c
> > +++ b/modules/audio_output/file.c
> > @@ -128,7 +128,8 @@ vlc_module_begin ()
> >      set_callbacks( Open, NULL )
> >  vlc_module_end ()
> > 
> > -static int Start( audio_output_t *p_aout, audio_sample_format_t *restrict
> > fmt ) +static int Start( audio_output_t *p_aout, audio_sample_format_t
> > *restrict fmt, +                  vlc_tick_t *period_hint )
> >  {
> >      char * psz_name, * psz_format;
> >      const char * const * ppsz_compare = format_list;
> > @@ -272,6 +273,7 @@ static int Start( audio_output_t *p_aout,
> > audio_sample_format_t *restrict fmt ) }
> > 
> >      return 0;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  /**************************************************************************
> > *** diff --git a/modules/audio_output/jack.c b/modules/audio_output/jack.c
> > index 59ad013b2f..0b0b772f8e 100644
> > --- a/modules/audio_output/jack.c
> > +++ b/modules/audio_output/jack.c
> > @@ -112,7 +112,8 @@ vlc_module_begin ()
> >  vlc_module_end ()
> > 
> > 
> > -static int Start( audio_output_t *p_aout, audio_sample_format_t *restrict
> > fmt ) +static int Start( audio_output_t *p_aout, audio_sample_format_t
> > *restrict fmt, +                  vlc_tick_t *period_hint )
> >  {
> >      char *psz_name;
> >      aout_sys_t *p_sys = p_aout->sys;
> > @@ -280,6 +281,7 @@ error_out:
> >      }
> >      free( psz_name );
> >      return status;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  static void Play(audio_output_t * p_aout, block_t * p_block, vlc_tick_t
> > date) diff --git a/modules/audio_output/kai.c b/modules/audio_output/kai.c
> > index 98a2182394..2afcc7f18b 100644
> > --- a/modules/audio_output/kai.c
> > +++ b/modules/audio_output/kai.c
> > @@ -124,7 +124,7 @@ vlc_module_end ()
> >  /**************************************************************************
> > *** * Open: open the audio device
> >  
> > ***************************************************************************
> > **/ -static int Start ( audio_output_t *p_aout, audio_sample_format_t *fmt )
> > +static int Start ( audio_output_t *p_aout, audio_sample_format_t *fmt,
> > vlc_tick_t *period_hint ) {
> >      aout_sys_t *p_sys = p_aout->sys;
> >      char *psz_mode;
> > @@ -228,6 +228,7 @@ exit_kai_done :
> >      kaiDone();
> > 
> >      return VLC_EGENERIC;
> > +    VLC_UNUSED( period );
> >  }
> > 
> >  /**************************************************************************
> > *** diff --git a/modules/audio_output/mmdevice.c
> > b/modules/audio_output/mmdevice.c index 3aded2b9d3..ad00606639 100644
> > --- a/modules/audio_output/mmdevice.c
> > +++ b/modules/audio_output/mmdevice.c
> > @@ -1117,7 +1117,8 @@ static void aout_stream_Stop(void *func, va_list ap)
> >      stop(s);
> >  }
> > 
> > -static int Start(audio_output_t *aout, audio_sample_format_t *restrict fmt)
> > +static int Start(audio_output_t *aout, audio_sample_format_t *restrict
> > fmt, +                 vlc_tick_t *period_hint)
> >  {
> >      aout_sys_t *sys = aout->sys;
> > 
> > @@ -1232,6 +1233,7 @@ static int Start(audio_output_t *aout,
> > audio_sample_format_t *restrict fmt) sys->stream = s;
> >      aout_GainRequest(aout, sys->gain);
> >      return 0;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  static void Stop(audio_output_t *aout)
> > diff --git a/modules/audio_output/opensles_android.c
> > b/modules/audio_output/opensles_android.c index f0d7360397..dd0d67f0fe
> > 100644
> > --- a/modules/audio_output/opensles_android.c
> > +++ b/modules/audio_output/opensles_android.c
> > @@ -380,7 +380,8 @@ static int aout_get_native_sample_rate(audio_output_t
> > *aout)
> > /**************************************************************************
> > *** *
> >  
> > ***************************************************************************
> > **/ -static int Start(audio_output_t *aout, audio_sample_format_t *restrict
> > fmt) +static int Start(audio_output_t *aout, audio_sample_format_t
> > *restrict fmt, +                 vlc_tick_t *period_hint)
> >  {
> >      if (aout_FormatNbChannels(fmt) == 0 || !AOUT_FMT_LINEAR(fmt))
> >          return VLC_EGENERIC;
> > @@ -496,6 +497,7 @@ error:
> >      }
> > 
> >      return VLC_EGENERIC;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  static void Stop(audio_output_t *aout)
> > diff --git a/modules/audio_output/oss.c b/modules/audio_output/oss.c
> > index 5e16255798..b905aee239 100644
> > --- a/modules/audio_output/oss.c
> > +++ b/modules/audio_output/oss.c
> > @@ -92,7 +92,8 @@ static void Play(audio_output_t *, block_t *, vlc_tick_t);
> > static void Pause (audio_output_t *, bool, vlc_tick_t);
> >  static void Flush (audio_output_t *, bool);
> > 
> > -static int Start (audio_output_t *aout, audio_sample_format_t *restrict
> > fmt) +static int Start (audio_output_t *aout, audio_sample_format_t
> > *restrict fmt, +                  vlc_tick_t *period_hint)
> >  {
> >      aout_sys_t* sys = aout->sys;
> > 
> > @@ -248,6 +249,7 @@ static int Start (audio_output_t *aout,
> > audio_sample_format_t *restrict fmt) error:
> >      vlc_close (fd);
> >      return VLC_EGENERIC;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  static int TimeGet (audio_output_t *aout, vlc_tick_t *restrict pts)
> > diff --git a/modules/audio_output/pulse.c b/modules/audio_output/pulse.c
> > index 5075dd92ce..eb53a1e2f3 100644
> > --- a/modules/audio_output/pulse.c
> > +++ b/modules/audio_output/pulse.c
> > @@ -696,7 +696,8 @@ static const char *str_map(const char *key, const char
> > *const table[][2], /**
> >   * Create a PulseAudio playback stream, a.k.a. a sink input.
> >   */
> > -static int Start(audio_output_t *aout, audio_sample_format_t *restrict fmt)
> > +static int Start(audio_output_t *aout, audio_sample_format_t *restrict
> > fmt, +                 vlc_tick_t *period_hint)
> >  {
> >      aout_sys_t *sys = aout->sys;
> > 
> > @@ -962,6 +963,7 @@ fail:
> >      pa_threaded_mainloop_unlock(sys->mainloop);
> >      Stop(aout);
> >      return VLC_EGENERIC;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  /**
> > diff --git a/modules/audio_output/sndio.c b/modules/audio_output/sndio.c
> > index 6b28772817..37fbee968e 100644
> > --- a/modules/audio_output/sndio.c
> > +++ b/modules/audio_output/sndio.c
> > @@ -62,7 +62,7 @@ typedef struct
> >  } aout_sys_t;
> > 
> >  /** Initializes an sndio playback stream */
> > -static int Start (audio_output_t *aout, audio_sample_format_t *restrict
> > fmt) +static int Start (audio_output_t *aout, audio_sample_format_t
> > *restrict fmt, vlc_tick_t *period_hint) {
> >      aout_sys_t *sys = aout->sys;
> > 
> > @@ -202,6 +202,7 @@ static int Start (audio_output_t *aout,
> > audio_sample_format_t *restrict fmt) error:
> >      sio_close (sys->hdl);
> >      return VLC_EGENERIC;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  static void Stop (audio_output_t *aout)
> > diff --git a/modules/audio_output/tizen_audio.c
> > b/modules/audio_output/tizen_audio.c index 6ed34ac3d3..1b64afa826 100644
> > --- a/modules/audio_output/tizen_audio.c
> > +++ b/modules/audio_output/tizen_audio.c
> > @@ -193,7 +193,8 @@ AudioIO_Start( audio_output_t *p_aout )
> >  }
> > 
> >  static int
> > -Start( audio_output_t *p_aout, audio_sample_format_t *restrict p_fmt )
> > +Start( audio_output_t *p_aout, audio_sample_format_t *restrict p_fmt,
> > +       vlc_tick_t *period_hint )
> >  {
> >      aout_sys_t *p_sys = p_aout->sys;
> > 
> > @@ -242,6 +243,7 @@ Start( audio_output_t *p_aout, audio_sample_format_t
> > *restrict p_fmt ) aout_FormatPrint( p_aout, "Tizen audio will output:",
> > p_fmt );
> > 
> >      return VLC_SUCCESS;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  static void
> > diff --git a/modules/audio_output/waveout.c b/modules/audio_output/waveout.c
> > index b71fe762bb..9c2ab98cf2 100644
> > --- a/modules/audio_output/waveout.c
> > +++ b/modules/audio_output/waveout.c
> > @@ -168,7 +168,8 @@ vlc_module_end ()
> >  
> > ***************************************************************************
> > ** * This function opens and setups Win32 waveOut
> >  
> > ***************************************************************************
> > **/ -static int Start( audio_output_t *p_aout, audio_sample_format_t
> > *restrict fmt ) +static int Start( audio_output_t *p_aout,
> > audio_sample_format_t *restrict fmt, +                  vlc_tick_t
> > *period_hint )
> >  {
> >      if( aout_FormatNbChannels( fmt ) == 0 )
> >          return VLC_EGENERIC;
> > @@ -334,6 +335,7 @@ static int Start( audio_output_t *p_aout,
> > audio_sample_format_t *restrict fmt ) fmt->channel_type =
> > AUDIO_CHANNEL_TYPE_BITMAP;
> > 
> >      return VLC_SUCCESS;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  /**************************************************************************
> > *** diff --git a/modules/audio_output/winstore.c
> > b/modules/audio_output/winstore.c index 5dcad97908..e419b60ae2 100644
> > --- a/modules/audio_output/winstore.c
> > +++ b/modules/audio_output/winstore.c
> > @@ -226,7 +226,8 @@ static void aout_stream_Stop(void *func, va_list ap)
> >      stop(s);
> >  }
> > 
> > -static int Start(audio_output_t *aout, audio_sample_format_t *restrict fmt)
> > +static int Start(audio_output_t *aout, audio_sample_format_t *restrict
> > fmt, +                 vlc_tick_t *period_hint)
> >  {
> >      aout_sys_t *sys = aout->sys;
> >      HRESULT hr;
> > @@ -252,6 +253,7 @@ static int Start(audio_output_t *aout,
> > audio_sample_format_t *restrict fmt) assert (sys->stream == NULL);
> >      sys->stream = s;
> >      return 0;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  static void Stop(audio_output_t *aout)
> > diff --git a/modules/video_output/decklink.cpp
> > b/modules/video_output/decklink.cpp index 597807d163..424dc65bbf 100644
> > --- a/modules/video_output/decklink.cpp
> > +++ b/modules/video_output/decklink.cpp
> > @@ -1099,7 +1099,8 @@ static int TimeGet(audio_output_t *, vlc_tick_t*
> > restrict) return -1;
> >  }
> > 
> > -static int Start(audio_output_t *aout, audio_sample_format_t *restrict fmt)
> > +static int Start(audio_output_t *aout, audio_sample_format_t *restrict
> > fmt, +                 vlc_tick_t *period_hint)
> >  {
> >      decklink_sys_t *sys = (decklink_sys_t *) aout->sys;
> > 
> > @@ -1116,6 +1117,7 @@ static int Start(audio_output_t *aout,
> > audio_sample_format_t *restrict fmt) fmt->i_frame_length  = FRAME_SIZE;
> > 
> >      return VLC_SUCCESS;
> > +    VLC_UNUSED(period_hint);
> >  }
> > 
> >  static void PlayAudio(audio_output_t *aout, block_t *audio, vlc_tick_t
> > systempts) diff --git a/src/audio_output/output.c
> > b/src/audio_output/output.c index 7c1f90b6ba..f7a684c57d 100644
> > --- a/src/audio_output/output.c
> > +++ b/src/audio_output/output.c
> > @@ -570,7 +570,8 @@ int aout_OutputNew (audio_output_t *aout,
> > audio_sample_format_t *restrict fmt, aout->current_sink_info.headphones =
> > false;
> > 
> >      aout_OutputLock(aout);
> > -    int ret = aout->start(aout, fmt);
> > +    vlc_tick_t period_hint = AOUT_MAX_PTS_ADVANCE;
> > +    int ret = aout->start(aout, fmt, &period_hint);
> >      aout_OutputUnlock(aout);
> >      if (ret)
> >      {
> 
> 
> -- 
> レミ・デニ-クールモン
> http://www.remlab.net/
> 
> 
> 
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