On Sat, 5 Aug 2017 23:53:07 +0100
Mark Thompson <s...@jkqxz.net> wrote:
> AVFilterContext.extra_hw_frames functions identically to the field of
> the same name in AVCodecContext.
> ---
> Implemented in such a way that an init_hw_frames callback could be added here
> as well, if anyone had a use-case for it.
>
>
> doc/APIchanges | 3 +++
> libavfilter/avfilter.c | 23 +++++++++++++++++++++++
> libavfilter/avfilter.h | 13 +++++++++++++
> libavfilter/internal.h | 16 ++++++++++++++++
> 4 files changed, 55 insertions(+)
>
> diff --git a/doc/APIchanges b/doc/APIchanges
> index c111d08ad..5b8143561 100644
> --- a/doc/APIchanges
> +++ b/doc/APIchanges
> @@ -13,6 +13,9 @@ libavutil: 2017-03-23
>
> API changes, most recent first:
>
> +2017-xx-xx - xxxxxxx - lavfi 7.x+1.0 - avfilter.h
> + Add AVFilterContext.extra_hw_frames.
> +
> 2017-xx-xx - xxxxxxx - lavc 58.x+1.0 - avcodec.h
> Add AVCodecContext.init_hw_frames and AVCodecContext.extra_hw_frames.
>
> diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
> index 83c1a7c20..1161f4771 100644
> --- a/libavfilter/avfilter.c
> +++ b/libavfilter/avfilter.c
> @@ -368,6 +368,8 @@ static const AVOption avfilter_options[] = {
> { "thread_type", "Allowed thread types", OFFSET(thread_type),
> AV_OPT_TYPE_FLAGS,
> { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
> { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 =
> AVFILTER_THREAD_SLICE }, .unit = "thread_type" },
> + { "extra_hw_frames", "Number of extra hardware frames to allocate for
> the user",
> + OFFSET(extra_hw_frames), AV_OPT_TYPE_INT, { .i64 = -1 }, -1,
> INT_MAX, FLAGS },
> { NULL },
> };
>
> @@ -707,3 +709,24 @@ const AVClass *avfilter_get_class(void)
> {
> return &avfilter_class;
> }
> +
> +int ff_filter_init_hw_frames(AVFilterContext *avctx, AVFilterLink *link,
> + int default_pool_size)
> +{
> + AVHWFramesContext *frames;
> +
> + // Must already be set by caller.
> + av_assert0(link->hw_frames_ctx);
> +
> + frames = (AVHWFramesContext*)link->hw_frames_ctx->data;
> +
> + if (frames->initial_pool_size == 0) {
> + // Dynamically allocation is necessarily supported.
> + } else if (avctx->extra_hw_frames >= 0) {
> + frames->initial_pool_size += avctx->extra_hw_frames;
> + } else {
> + frames->initial_pool_size = default_pool_size;
> + }
> +
> + return 0;
> +}
> diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
> index 6df69dbbb..c8f861076 100644
> --- a/libavfilter/avfilter.h
> +++ b/libavfilter/avfilter.h
> @@ -311,6 +311,19 @@ struct AVFilterContext {
> * hardware context information.
> */
> AVBufferRef *hw_device_ctx;
> +
> + /**
> + * Sets the number of extra hardware frames which the filter will
> + * allocate on its output links for use in following filters or by
> + * the caller.
> + *
> + * Some hardware filters require all frames that they will use for
> + * output to be defined in advance before filtering starts. For such
> + * filters, any hardware frame pools used for output must therefore be
> + * of fixed size. The extra frames set here are on top of any number
> + * that the filter needs internally in order to operate normally.
> + */
> + int extra_hw_frames;
> };
>
> /**
> diff --git a/libavfilter/internal.h b/libavfilter/internal.h
> index a377f9b2b..d17f917c6 100644
> --- a/libavfilter/internal.h
> +++ b/libavfilter/internal.h
> @@ -226,4 +226,20 @@ void ff_filter_graph_remove_filter(AVFilterGraph *graph,
> AVFilterContext *filter
> */
> #define FF_FILTER_FLAG_HWFRAME_AWARE (1 << 0)
>
> +/**
> + * Perform any additional setup required for hardware frames.
> + *
> + * link->hw_frames_ctx must be set before calling this function.
> + * Inside link->hw_frames_ctx, the fields format, sw_format, width and
> + * height must be set. If dynamically allocated pools are not supported,
> + * then initial_pool_size must also be set, to the minimum hardware frame
> + * pool size necessary for decode (taking into account reference frames
> + * and delay as appropriate). If default_pool_size is nonzero, then it
> + * will be used as the pool size if no other modification takes place
> + * (this can be used to preserve compatibility).
> + */
> +int ff_filter_init_hw_frames(AVFilterContext *avctx, AVFilterLink *link,
> + int default_pool_size);
> +
> +
> #endif /* AVFILTER_INTERNAL_H */
Seems good.
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