filter_chain.c

VLC Player Source Code

    free( psz_name );

    int ret = filter_chain_AppendFromStringInternal( p_chain, psz_new_string );
    free( psz_new_string );
    if( ret < 0 )
    {
        filter_chain_DeleteFilterInternal( p_chain, p_filter );
        return ret;
    }
    return 1 + ret;
}

int filter_chain_AppendFromString( filter_chain_t *p_chain,
                                   const char *psz_string )
{
    int i_ret = filter_chain_AppendFromStringInternal( p_chain, psz_string );
    if( i_ret < 0 ) return i_ret;
    int i_ret2 = UpdateBufferFunctions( p_chain );
    if( i_ret2 < 0 ) return i_ret2;
    return i_ret;
}

static int filter_chain_DeleteFilterInternal( filter_chain_t *p_chain,
                                              filter_t *p_filter )
{
    int i;
    /* Find the filter in the chain */
    for( i = 0; i < p_chain->filters.i_count; i++ )
        if( (filter_t*)p_chain->filters.pp_elems[i] == p_filter )
            break;

    /* Oops, filter wasn't found */
    if( i == p_chain->filters.i_count )
    {
        msg_Err( p_chain->p_this, "Couldn't find filter '%s' (%p) when trying "
                 "to remove it from chain", p_filter->psz_object_name,
                 p_filter );
        return VLC_EGENERIC;
    }

    /* Remove it from the chain */
    vlc_array_remove( &p_chain->filters, i );
    msg_Dbg( p_chain->p_this, "Filter '%s' (%p) removed from chain",
             p_filter->psz_object_name, p_filter );

    /* Destroy the filter object */
    if( p_chain->pf_buffer_allocation_clear )
        p_chain->pf_buffer_allocation_clear( p_filter );
    vlc_object_detach( p_filter );
    if( p_filter->p_module )
        module_Unneed( p_filter, p_filter->p_module );
    vlc_object_release( p_filter );

    /* FIXME: check fmt_in/fmt_out consitency */
    return VLC_SUCCESS;
}

int filter_chain_DeleteFilter( filter_chain_t *p_chain, filter_t *p_filter )
{
    int i_ret = filter_chain_DeleteFilterInternal( p_chain, p_filter );
    if( i_ret < 0 ) return i_ret;
    return UpdateBufferFunctions( p_chain );
}

/**
 * Reading from the filter chain
 */
filter_t *filter_chain_GetFilter( filter_chain_t *p_chain, int i_position,
                                  const char *psz_name )
{
    int i;
    filter_t **pp_filters = (filter_t **)p_chain->filters.pp_elems;

    if( i_position < 0 )
        return NULL;

    if( !psz_name )
    {
        if( i_position >= p_chain->filters.i_count )
            return NULL;
        return pp_filters[i_position];
    }

    for( i = 0; i < p_chain->filters.i_count; i++ )
    {
        if( !strcmp( psz_name, pp_filters[i]->psz_object_name ) )
            i_position--;
        if( i_position < 0 )
            return pp_filters[i];
   }
   return NULL;
}

int filter_chain_GetLength( filter_chain_t *p_chain )
{
    return p_chain->filters.i_count;
}

const es_format_t *filter_chain_GetFmtOut( filter_chain_t *p_chain )
{

    if( p_chain->b_allow_fmt_out_change )
        return &p_chain->fmt_out;

    /* Unless filter_chain_Reset has been called we are doomed */
    if( p_chain->filters.i_count <= 0 )
        return &p_chain->fmt_out;

    /* */
    filter_t *p_last = (filter_t*)p_chain->filters.pp_elems[p_chain->filters.i_count-1];

    return &p_last->fmt_out;
}

/**
 * Apply the filter chain
 */

/* FIXME This include is needed by the Ugly hack */
#include <vlc_vout.h>

picture_t *filter_chain_VideoFilter( filter_chain_t *p_chain, picture_t *p_pic )
{
    int i;
    filter_t **pp_filter = (filter_t **)p_chain->filters.pp_elems;
    for( i = 0; i < p_chain->filters.i_count; i++ )
    {
        filter_t *p_filter = pp_filter[i];
        picture_t *p_newpic = p_filter->pf_video_filter( p_filter, p_pic );

        if( !p_newpic )
            return NULL;

        p_pic = p_newpic;
    }
    return p_pic;
}

block_t *filter_chain_AudioFilter( filter_chain_t *p_chain, block_t *p_block )
{
    int i;
    filter_t **pp_filter = (filter_t **)p_chain->filters.pp_elems;
    for( i = 0; i < p_chain->filters.i_count; i++ )
    {
        filter_t *p_filter = pp_filter[i];
        p_block = p_filter->pf_audio_filter( p_filter, p_block );
        if( !p_block )
            return NULL;
    }
    return p_block;
}

#include <vlc_osd.h>

void filter_chain_SubFilter( filter_chain_t *p_chain,
                             mtime_t display_date )
{
    int i;
    filter_t **pp_filter = (filter_t **)p_chain->filters.pp_elems;
    for( i = 0; i < p_chain->filters.i_count; i++ )
    {
        filter_t *p_filter = pp_filter[i];
        subpicture_t *p_subpic = p_filter->pf_sub_filter( p_filter,
                                                          display_date );
        if( p_subpic )
            spu_DisplaySubpicture( (spu_t*)p_chain->p_this, p_subpic );
    }
}

/**
 * Internal chain buffer handling
 */

/**
 * This function should be called after every filter chain change
 */
static int UpdateBufferFunctions( filter_chain_t *p_chain )
{
    if( !strcmp( p_chain->psz_capability, "video filter2" ) )
    {
        /**
         * Last filter uses the filter chain's parent buffer allocation
         * functions. All the other filters use internal functions.
         * This makes it possible to have format changes between each
         * filter without having to worry about the parent's picture
         * heap format.
         */
        int i;
        filter_t **pp_filter = (filter_t **)p_chain->filters.pp_elems;
        filter_t *p_filter;
        for( i = 0; i < p_chain->filters.i_count - 1; i++ )
        {
            p_filter = pp_filter[i];
            if( p_filter->pf_vout_buffer_new != VideoBufferNew )
            {
                if( p_chain->pf_buffer_allocation_clear )
                    p_chain->pf_buffer_allocation_clear( p_filter );
                p_filter->pf_vout_buffer_new = VideoBufferNew;
                p_filter->pf_vout_buffer_del = VideoBufferDelete;
            }
        }
        if( p_chain->filters.i_count >= 1 )
        {
            p_filter = pp_filter[i];
            if( p_filter->pf_vout_buffer_new == VideoBufferNew )
            {
                p_filter->pf_vout_buffer_new = NULL;
                p_filter->pf_vout_buffer_del = NULL;
                if( p_chain->pf_buffer_allocation_init( p_filter,
                        p_chain->p_buffer_allocation_data ) != VLC_SUCCESS )
                    return VLC_EGENERIC;
            }
        }
    }
    return VLC_SUCCESS;
}

static picture_t *VideoBufferNew( filter_t *p_filter )
{
    const video_format_t *p_fmt = &p_filter->fmt_out.video;

    picture_t *p_picture = picture_New( p_fmt->i_chroma,
                                        p_fmt->i_width, p_fmt->i_height,
                                        p_fmt->i_aspect );
    if( !p_picture )
        msg_Err( p_filter, "Failed to allocate picture\n" );
    return p_picture;
}
static void VideoBufferDelete( filter_t *p_filter, picture_t *p_picture )
{
    picture_Release( p_picture );
}