[vlc-devel] [PATCH] Remove libvlc equalizer implementation from the audio output core.

[Rémi Denis-Courmont]

Le vendredi 21 septembre 2012 12:21:04, Mark Lee a écrit :
> Rather than using callbacks in the core, the audio equalizer is simply
> directly applied (when enabled) to the aout:
> 
>  1. each time an aout is created;
>  2. each time the equalizer is set on the media player.
> ---
>  lib/media_player.c        |   34 ++++++++++++++++++++++++++++++----
>  src/audio_output/common.c |   15 ---------------
>  2 files changed, 30 insertions(+), 19 deletions(-)
> 
> diff --git a/lib/media_player.c b/lib/media_player.c
> index b9b2a11..e4950b1 100644
> --- a/lib/media_player.c
> +++ b/lib/media_player.c
> @@ -32,6 +32,7 @@
> 
>  #include <vlc_demux.h>
>  #include <vlc_input.h>
> +#include <vlc_aout.h>
>  #include <vlc_vout.h>
>  #include <vlc_keys.h>
>  #include <vlc_aout_intf.h>
> @@ -191,6 +192,24 @@ static void set_state( libvlc_media_player_t *p_mi,
> libvlc_state_t state, }
>  }
> 
> +static void apply_equalizer( input_thread_t *p_input,
> libvlc_media_player_t *p_mi ) +{
> +    audio_output_t *p_aout;
> +    if( input_Control( p_input, INPUT_GET_AOUT, &p_aout ) == VLC_SUCCESS )
> +    {
> +        char *psz_bands = var_GetString( p_mi, "equalizer-bands" );
> +        if( psz_bands && *psz_bands )
> +        {
> +            var_SetString( p_aout, "equalizer-bands", psz_bands );
> +            var_SetFloat( p_aout, "equalizer-preamp", var_GetFloat( p_mi,
> "equalizer-preamp" ) ); +            aout_EnableFilter( p_mi, "equalizer",
> true );
> +        }
> +        free( psz_bands );
> +
> +        vlc_object_release( p_aout );
> +    }
> +}

This cannot be right. Variable inheritance deals with this automatically if 
the rest is done correctly.

> +
>  static int
>  input_seekable_changed( vlc_object_t * p_this, char const * psz_cmd,
>                          vlc_value_t oldval, vlc_value_t newval,
> @@ -335,6 +354,8 @@ input_event_changed( vlc_object_t * p_this, char const
> * psz_cmd, event.u.media_player_vout.new_count = i_vout;
>          libvlc_event_send( p_mi->p_event_manager, &event );
>      }
> +    else if( newval.i_int == INPUT_EVENT_AOUT )
> +        apply_equalizer( p_input, p_mi );
> 
>      return VLC_SUCCESS;
>  }
> @@ -751,9 +772,6 @@ int libvlc_media_player_play( libvlc_media_player_t
> *p_mi ) p_mi->input.p_thread = p_input_thread;
>      unlock_input(p_mi);
> 
> -    if( strlen( var_GetString( p_mi, "equalizer-bands" ) ) > 0 )
> -        aout_EnableFilter( p_mi, "equalizer", true );
> -
>      return 0;
>  }
> 
> @@ -1420,6 +1438,8 @@ void libvlc_media_player_next_frame(
> libvlc_media_player_t *p_mi )
> 
>  int libvlc_media_player_set_equalizer( libvlc_media_player_t *p_mi,
> libvlc_equalizer_t *p_equalizer ) {
> +    input_thread_t *p_input_thread;
> +
>      if ( !p_equalizer )
>      {
>          aout_EnableFilter( p_mi, "equalizer", false );
> @@ -1444,6 +1464,12 @@ int libvlc_media_player_set_equalizer(
> libvlc_media_player_t *p_mi, libvlc_equal var_SetString( p_mi,
> "equalizer-bands", psz_bands );
>      free( psz_bands );
> 
> -    aout_EnableFilter( p_mi, "equalizer", true );
> +    p_input_thread = libvlc_get_input_thread( p_mi );
> +    if ( !p_input_thread )
> +        return 0;
> +
> +    apply_equalizer( p_input_thread, p_mi );
> +
> +    vlc_object_release( p_input_thread );
>      return 0;
>  }
> diff --git a/src/audio_output/common.c b/src/audio_output/common.c
> index 949d3b5..f839d02 100644
> --- a/src/audio_output/common.c
> +++ b/src/audio_output/common.c
> @@ -177,15 +177,6 @@ audio_output_t *aout_New( vlc_object_t * p_parent )
>                              &val, &text);
>          }
> 
> -    if (var_Type (p_parent, "equalizer-bands"))
> -    {
> -        var_Create (aout, "equalizer-preamp", VLC_VAR_FLOAT |
> VLC_VAR_DOINHERIT); -        var_Create (aout, "equalizer-bands",
> VLC_VAR_STRING | VLC_VAR_DOINHERIT); -
> -        var_AddCallback (p_parent, "equalizer-preamp", var_Copy, aout);
> -        var_AddCallback (p_parent, "equalizer-bands", var_Copy, aout);
> -    }
> -
>      return aout;
>  }
> 
> @@ -200,12 +191,6 @@ void aout_Destroy (audio_output_t *aout)
>      var_SetFloat (aout, "volume", -1.f);
>      var_DelCallback (aout, "volume", var_Copy, aout->p_parent);
> 
> -    if (var_Type (aout->p_parent, "equalizer-bands"))
> -    {
> -        var_DelCallback (aout->p_parent, "equalizer-preamp", var_Copy,
> aout); -        var_DelCallback (aout->p_parent, "equalizer-bands",
> var_Copy, aout); -    }
> -
>      vlc_object_release (aout);
>  }

-- 
Rémi Denis-Courmont
http://www.remlab.net/