X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavfilter%2Fvideo.h;h=c677f300470b0ede83ca02095919e5c87dfd077d;hb=7a72695c05f12f21a62dc99fa64d1726fc11b236;hp=e24dd9a38ea02ee71e819d43955e2773dcb1a301;hpb=ca7fa3a5167dc480917491bca4a1bc873d24125a;p=ffmpeg

diff --git a/libavfilter/video.h b/libavfilter/video.h
index e24dd9a38ea..c677f300470 100644
--- a/libavfilter/video.h
+++ b/libavfilter/video.h
@@ -28,9 +28,70 @@ AVFilterBufferRef *ff_default_get_video_buffer(AVFilterLink *link,
                                                int perms, int w, int h);
 AVFilterBufferRef *ff_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h);
 
+/**
+ * Request a picture buffer with a specific set of permissions.
+ *
+ * @param link  the output link to the filter from which the buffer will
+ *              be requested
+ * @param perms the required access permissions
+ * @param w     the minimum width of the buffer to allocate
+ * @param h     the minimum height of the buffer to allocate
+ * @return      A reference to the buffer. This must be unreferenced with
+ *              avfilter_unref_buffer when you are finished with it.
+ */
+AVFilterBufferRef *ff_get_video_buffer(AVFilterLink *link, int perms,
+                                       int w, int h);
+
+int ff_inplace_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
+int ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
+int ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
+int ff_null_end_frame(AVFilterLink *link);
+
+/**
+ * Notify the next filter of the start of a frame.
+ *
+ * @param link   the output link the frame will be sent over
+ * @param picref A reference to the frame about to be sent. The data for this
+ *               frame need only be valid once draw_slice() is called for that
+ *               portion. The receiving filter will free this reference when
+ *               it no longer needs it.
+ *
+ * @return >= 0 on success, a negative AVERROR on error. This function will
+ * unreference picref in case of error.
+ */
+int ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
+
+/**
+ * Pass video frame along and keep an internal reference for later use.
+ */
+int ff_null_start_frame_keep_ref(AVFilterLink *inlink, AVFilterBufferRef *picref);
 
-void ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
-void ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
-void ff_null_end_frame(AVFilterLink *link);
+/**
+ * Notify the next filter that the current frame has finished.
+ *
+ * @param link the output link the frame was sent over
+ *
+ * @return >= 0 on success, a negative AVERROR on error
+ */
+int ff_end_frame(AVFilterLink *link);
+
+/**
+ * Send a slice to the next filter.
+ *
+ * Slices have to be provided in sequential order, either in
+ * top-bottom or bottom-top order. If slices are provided in
+ * non-sequential order the behavior of the function is undefined.
+ *
+ * @param link the output link over which the frame is being sent
+ * @param y    offset in pixels from the top of the image for this slice
+ * @param h    height of this slice in pixels
+ * @param slice_dir the assumed direction for sending slices,
+ *             from the top slice to the bottom slice if the value is 1,
+ *             from the bottom slice to the top slice if the value is -1,
+ *             for other values the behavior of the function is undefined.
+ *
+ * @return >= 0 on success, a negative AVERROR on error.
+ */
+int ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
 
 #endif /* AVFILTER_VIDEO_H */