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lavfi: add query_func2()

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It differs from query_func() in accepting arrays of input/output format
configurations to be filled as callback parameters. This allows to mark
the filter context as const, ensuring it is not modified by this
function, as it is not supposed to have any side effects beyond
returning the supported formats.
This commit is contained in:
Anton Khirnov
2024-08-29 08:23:19 +02:00
parent 01f2d95fbf
commit eddffbedb3
6 changed files with 347 additions and 36 deletions
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libavfilter/avfilter.h
+50 -35
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@@ -98,6 +98,41 @@ const char *avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx);
*/
enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx);
/**
* Lists of formats / etc. supported by an end of a link.
*
* This structure is directly part of AVFilterLink, in two copies:
* one for the source filter, one for the destination filter.
* These lists are used for negotiating the format to actually be used,
* which will be loaded into the format and channel_layout members of
* AVFilterLink, when chosen.
*/
typedef struct AVFilterFormatsConfig {
/**
* List of supported formats (pixel or sample).
*/
AVFilterFormats *formats;
/**
* Lists of supported sample rates, only for audio.
*/
AVFilterFormats *samplerates;
/**
* Lists of supported channel layouts, only for audio.
*/
AVFilterChannelLayouts *channel_layouts;
/**
* Lists of supported YUV color metadata, only for YUV video.
*/
AVFilterFormats *color_spaces; ///< AVColorSpace
AVFilterFormats *color_ranges; ///< AVColorRange
} AVFilterFormatsConfig;
/**
* The number of the filter inputs is not determined just by AVFilter.inputs.
* The filter might add additional inputs during initialization depending on the
@@ -324,6 +359,21 @@ typedef struct AVFilter {
* AVERROR code otherwise
*/
int (*query_func)(AVFilterContext *);
/**
* Same as query_func(), except this function writes the results into
* provided arrays.
*
* @param cfg_in array of input format configurations with as many
* members as the filters has inputs (NULL when there are
* no inputs);
* @param cfg_out array of output format configurations with as many
* members as the filters has outputs (NULL when there
* are no outputs);
*/
int (*query_func2)(const AVFilterContext *,
struct AVFilterFormatsConfig **cfg_in,
struct AVFilterFormatsConfig **cfg_out);
/**
* A pointer to an array of admissible pixel formats delimited
* by AV_PIX_FMT_NONE. The generic code will use this list
@@ -492,41 +542,6 @@ struct AVFilterContext {
int extra_hw_frames;
};
/**
* Lists of formats / etc. supported by an end of a link.
*
* This structure is directly part of AVFilterLink, in two copies:
* one for the source filter, one for the destination filter.
* These lists are used for negotiating the format to actually be used,
* which will be loaded into the format and channel_layout members of
* AVFilterLink, when chosen.
*/
typedef struct AVFilterFormatsConfig {
/**
* List of supported formats (pixel or sample).
*/
AVFilterFormats *formats;
/**
* Lists of supported sample rates, only for audio.
*/
AVFilterFormats *samplerates;
/**
* Lists of supported channel layouts, only for audio.
*/
AVFilterChannelLayouts *channel_layouts;
/**
* Lists of supported YUV color metadata, only for YUV video.
*/
AVFilterFormats *color_spaces; ///< AVColorSpace
AVFilterFormats *color_ranges; ///< AVColorRange
} AVFilterFormatsConfig;
/**
* A link between two filters. This contains pointers to the source and
* destination filters between which this link exists, and the indexes of