Linjie Fu:
> From: Linjie Fu <linjie.justin...@gmail.com>
>
> To pass the swscale options for the inserted scalers.
>
> ffmpeg -i input.mp4 -filter_complex \
> "scale_sws_opts=alphablend=checkerboard;format=nv12" \
> -t 0.5 output.mp4
>
> Update docs.
>
> Signed-off-by: Linjie Fu <linjie.justin...@gmail.com>
> ---
> doc/filters.texi | 7 ++++---
> libavfilter/graphparser.c | 27 +++++++++++++++++++++++++++
> 2 files changed, 31 insertions(+), 3 deletions(-)
>
> diff --git a/doc/filters.texi b/doc/filters.texi
> index 790d165433..dbbb3a6940 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -204,9 +204,9 @@ pads must be connected. A filtergraph is considered valid
> if all the
> filter input and output pads of all the filterchains are connected.
>
> Libavfilter will automatically insert @ref{scale} filters where format
> -conversion is required. It is possible to specify swscale flags
> -for those automatically inserted scalers by prepending
> -@code{sws_flags=@var{flags};}
> +conversion is required. It is possible to specify swscale flags or
> +scale_sws_opts for those automatically inserted scalers by prepending
> +@code{sws_flags=@var{flags};} or @code{scale_sws_opts=@var{scale_sws_opts};}
> to the filtergraph description.
>
> Here is a BNF description of the filtergraph syntax:
> @@ -219,6 +219,7 @@ Here is a BNF description of the filtergraph syntax:
> @var{FILTER} ::= [@var{LINKLABELS}] @var{FILTER_NAME} ["="
> @var{FILTER_ARGUMENTS}] [@var{LINKLABELS}]
> @var{FILTERCHAIN} ::= @var{FILTER} [,@var{FILTERCHAIN}]
> @var{FILTERGRAPH} ::= [sws_flags=@var{flags};] @var{FILTERCHAIN}
> [;@var{FILTERGRAPH}]
> +@var{FILTERGRAPH} ::= [scale_sws_opts=@var{opts};] @var{FILTERCHAIN}
> [;@var{FILTERGRAPH}]
> @end example
>
> @anchor{filtergraph escaping}
> diff --git a/libavfilter/graphparser.c b/libavfilter/graphparser.c
> index 1385c3ae71..8c63d6454e 100644
> --- a/libavfilter/graphparser.c
> +++ b/libavfilter/graphparser.c
> @@ -415,6 +415,30 @@ static int parse_sws_flags(const char **buf,
> AVFilterGraph *graph)
> return 0;
> }
>
> +static int parse_scale_sws_opts(const char **buf, AVFilterGraph *graph)
> +{
> + char *p = strchr(*buf, ';');
> +
> + if (strncmp(*buf, "scale_sws_opts=", 15)) {
av_strstart()
> + return 0;
> + }
> +
> + if (!p) {
> + av_log(graph, AV_LOG_ERROR, "scale_sws_opts not terminated with
> ';'.\n");
> + return AVERROR(EINVAL);
> + }
> +
> + *buf += 15;
> +
> + av_freep(&graph->scale_sws_opts);
> + if (!(graph->scale_sws_opts = av_mallocz(p - *buf + 1)))
> + return AVERROR(ENOMEM);
> + av_strlcpy(graph->scale_sws_opts, *buf, p - *buf + 1);
av_strndup()
> +
> + *buf = p + 1;
> + return 0;
> +}
> +
> int avfilter_graph_parse2(AVFilterGraph *graph, const char *filters,
> AVFilterInOut **inputs,
> AVFilterInOut **outputs)
> @@ -429,6 +453,9 @@ int avfilter_graph_parse2(AVFilterGraph *graph, const
> char *filters,
> if ((ret = parse_sws_flags(&filters, graph)) < 0)
> goto fail;
>
> + if ((ret = parse_scale_sws_opts(&filters, graph)) < 0)
> + goto fail;
> +
> do {
> AVFilterContext *filter;
> filters += strspn(filters, WHITESPACES);
>
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