• Andreas Rheinhardt's avatar
    avfilter: Replace query_formats callback with union of list and callback · b4f52019
    Andreas Rheinhardt authored
    If one looks at the many query_formats callbacks in existence,
    one will immediately recognize that there is one type of default
    callback for video and a slightly different default callback for
    audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);"
    for video with a filter-specific pix_fmts list. For audio, it is
    the same with a filter-specific sample_fmts list together with
    ff_set_common_all_samplerates() and ff_set_common_all_channel_counts().
    
    This commit allows to remove the boilerplate query_formats callbacks
    by replacing said callback with a union consisting the old callback
    and pointers for pixel and sample format arrays. For the not uncommon
    case in which these lists only contain a single entry (besides the
    sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also
    added to the union to store them directly in the AVFilter,
    thereby avoiding a relocation.
    
    The state of said union will be contained in a new, dedicated AVFilter
    field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t
    in order to create a hole for this new field; this is no problem, as
    the maximum of all the nb_inputs is four; for nb_outputs it is only
    two).
    
    The state's default value coincides with the earlier default of
    query_formats being unset, namely that the filter accepts all formats
    (and also sample rates and channel counts/layouts for audio)
    provided that these properties agree coincide for all inputs and
    outputs.
    
    By using different union members for audio and video filters
    the type-unsafety of using the same functions for audio and video
    lists will furthermore be more confined to formats.c than before.
    
    When the new fields are used, they will also avoid allocations:
    Currently something nearly equivalent to ff_default_query_formats()
    is called after every successful call to a query_formats callback;
    yet in the common case that the newly allocated AVFilterFormats
    are not used at all (namely if there are no free links) these newly
    allocated AVFilterFormats are freed again without ever being used.
    Filters no longer using the callback will not exhibit this any more.
    Reviewed-by: 's avatarPaul B Mahol <onemda@gmail.com>
    Reviewed-by: 's avatarNicolas George <george@nsup.org>
    Signed-off-by: 's avatarAndreas Rheinhardt <andreas.rheinhardt@outlook.com>
    b4f52019
af_channelsplit.c 5.45 KB