[vlmc-devel] MLTTrack: Implement replaceWithBlank

[Hugo Beauzée-Luyssen]

On 07/28/2016 02:39 PM, Yikai Lu wrote:
> vlmc | branch: master | Yikai Lu <luyikei.qmltu at gmail.com> | Thu Jul 28 20:57:17 2016 +0900| [4e16dae848732a1496673e0c5d66417b25011e2f] | committer: Yikai Lu
>
> MLTTrack: Implement replaceWithBlank
>
>> https://code.videolan.org/videolan/vlmc/commit/4e16dae848732a1496673e0c5d66417b25011e2f
> ---
>
>  src/Backend/ITrack.h         | 1 +
>  src/Backend/MLT/MLTTrack.cpp | 7 +++++++
>  src/Backend/MLT/MLTTrack.h   | 1 +
>  3 files changed, 9 insertions(+)
>
> diff --git a/src/Backend/ITrack.h b/src/Backend/ITrack.h
> index 9e2b836..bf9b9d1 100644
> --- a/src/Backend/ITrack.h
> +++ b/src/Backend/ITrack.h
> @@ -34,6 +34,7 @@ namespace Backend
>          virtual ~ITrack() = default;
>
>          virtual bool        insertAt( IInput& input, int64_t startFrame ) = 0;
> +        virtual void        replaceWithBlank( int index ) = 0;
>          virtual bool        append( IInput& input ) = 0;
>          virtual bool        remove( int index ) = 0;
>          // src and dist are indexes.
> diff --git a/src/Backend/MLT/MLTTrack.cpp b/src/Backend/MLT/MLTTrack.cpp
> index 033e0af..bf546f3 100644
> --- a/src/Backend/MLT/MLTTrack.cpp
> +++ b/src/Backend/MLT/MLTTrack.cpp
> @@ -88,6 +88,13 @@ MLTTrack::insertAt( Backend::IInput& input, int64_t startFrame )
>      return !playlist()->insert_at( (int)startFrame, mltInput->producer(), 1 );
>  }
>
> +void
> +MLTTrack::replaceWithBlank( int index )
> +{
> +    std::unique_ptr<Mlt::Producer> mltProducer( playlist()->replace_with_blank( index ) );
> +    playlist()->consolidate_blanks( 0 );
> +}
> +
>  bool
>  MLTTrack::append( Backend::IInput& input )
>  {
> diff --git a/src/Backend/MLT/MLTTrack.h b/src/Backend/MLT/MLTTrack.h
> index 1e77c7b..dadd543 100644
> --- a/src/Backend/MLT/MLTTrack.h
> +++ b/src/Backend/MLT/MLTTrack.h
> @@ -52,6 +52,7 @@ class MLTTrack : public ITrack, public MLTInput
>          virtual Mlt::Producer*  producer() const override;
>
>          virtual bool        insertAt( IInput& input, int64_t startFrame ) override;
> +        virtual void        replaceWithBlank( int index ) override;
>          virtual bool        append( IInput& input ) override;
>          virtual bool        remove( int index ) override;
>          virtual bool        move( int src, int dist ) override;
>
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>

Out of curiosity, what's this method purpose? Or more specifically, I 
suppose it's replacing a media with a blank area, but what's the 
difference with deleting a media?

Regards,