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Diffstat (limited to 'libavfilter/avfilter.h')
| -rw-r--r-- | libavfilter/avfilter.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h index f7208754a7..b105dc3159 100644 --- a/libavfilter/avfilter.h +++ b/libavfilter/avfilter.h @@ -120,6 +120,22 @@ enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx); */ #define AVFILTER_FLAG_SLICE_THREADS (1 << 2) /** + * The filter is a "metadata" filter - it does not modify the frame data in any + * way. It may only affect the metadata (i.e. those fields copied by + * av_frame_copy_props()). + * + * More precisely, this means: + * - video: the data of any frame output by the filter must be exactly equal to + * some frame that is received on one of its inputs. Furthermore, all frames + * produced on a given output must correspond to frames received on the same + * input and their order must be unchanged. Note that the filter may still + * drop or duplicate the frames. + * - audio: the data produced by the filter on any of its outputs (viewed e.g. + * as an array of interleaved samples) must be exactly equal to the data + * received by the filter on one of its inputs. + */ +#define AVFILTER_FLAG_METADATA_ONLY (1 << 3) +/** * Some filters support a generic "enable" expression option that can be used * to enable or disable a filter in the timeline. Filters supporting this * option have this flag set. When the enable expression is false, the default |