[FFmpeg-cvslog] lavfi: add helper functions and macros for activate.
Nicolas George
git at videolan.org
Tue Sep 12 12:07:33 EEST 2017
ffmpeg | branch: master | Nicolas George <george at nsup.org> | Thu Aug 31 17:05:04 2017 +0200| [76613618d978f9dbee0f391a85a732f77fac75cd] | committer: Nicolas George
lavfi: add helper functions and macros for activate.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=76613618d978f9dbee0f391a85a732f77fac75cd
---
libavfilter/avfilter.c | 20 +++++++++++++
libavfilter/filters.h | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 98 insertions(+)
diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index e5c1238182..58917ed445 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -1668,6 +1668,26 @@ void ff_inlink_request_frame(AVFilterLink *link)
ff_filter_set_ready(link->src, 100);
}
+void ff_inlink_set_status(AVFilterLink *link, int status)
+{
+ if (link->status_out)
+ return;
+ link->frame_wanted_out = 0;
+ link->frame_blocked_in = 0;
+ ff_avfilter_link_set_out_status(link, status, AV_NOPTS_VALUE);
+ while (ff_framequeue_queued_frames(&link->fifo)) {
+ AVFrame *frame = ff_framequeue_take(&link->fifo);
+ av_frame_free(&frame);
+ }
+ if (!link->status_in)
+ link->status_in = status;
+}
+
+int ff_outlink_get_status(AVFilterLink *link)
+{
+ return link->status_in;
+}
+
const AVClass *avfilter_get_class(void)
{
return &avfilter_class;
diff --git a/libavfilter/filters.h b/libavfilter/filters.h
index 1cbc18158f..4e2652ebe5 100644
--- a/libavfilter/filters.h
+++ b/libavfilter/filters.h
@@ -141,6 +141,12 @@ int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts
void ff_inlink_request_frame(AVFilterLink *link);
/**
+ * Set the status on an input link.
+ * Also discard all frames in the link's FIFO.
+ */
+void ff_inlink_set_status(AVFilterLink *link, int status);
+
+/**
* Test if a frame is wanted on an output link.
*/
static inline int ff_outlink_frame_wanted(AVFilterLink *link)
@@ -149,6 +155,11 @@ static inline int ff_outlink_frame_wanted(AVFilterLink *link)
}
/**
+ * Get the status on an output link.
+ */
+int ff_outlink_get_status(AVFilterLink *link);
+
+/**
* Set the status field of a link from the source filter.
* The pts should reflect the timestamp of the status change,
* in link time base and relative to the frames timeline.
@@ -160,4 +171,71 @@ static inline void ff_outlink_set_status(AVFilterLink *link, int status, int64_t
ff_avfilter_link_set_in_status(link, status, pts);
}
+/**
+ * Forward the status on an output link to an input link.
+ * If the status is set, it will discard all queued frames and this macro
+ * will return immediately.
+ */
+#define FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink) do { \
+ int ret = ff_outlink_get_status(outlink); \
+ if (ret) { \
+ ff_inlink_set_status(inlink, ret); \
+ return 0; \
+ } \
+} while (0)
+
+/**
+ * Forward the status on an output link to all input links.
+ * If the status is set, it will discard all queued frames and this macro
+ * will return immediately.
+ */
+#define FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, filter) do { \
+ int ret = ff_outlink_get_status(outlink); \
+ if (ret) { \
+ unsigned i; \
+ for (i = 0; i < filter->nb_inputs; i++) \
+ ff_inlink_set_status(filter->inputs[i], ret); \
+ return 0; \
+ } \
+} while (0)
+
+/**
+ * Acknowledge the status on an input link and forward it to an output link.
+ * If the status is set, this macro will return immediately.
+ */
+#define FF_FILTER_FORWARD_STATUS(inlink, outlink) do { \
+ int status; \
+ int64_t pts; \
+ if (ff_inlink_acknowledge_status(inlink, &status, &pts)) { \
+ ff_outlink_set_status(outlink, status, pts); \
+ return 0; \
+ } \
+} while (0)
+
+/**
+ * Acknowledge the status on an input link and forward it to an output link.
+ * If the status is set, this macro will return immediately.
+ */
+#define FF_FILTER_FORWARD_STATUS_ALL(inlink, filter) do { \
+ int status; \
+ int64_t pts; \
+ if (ff_inlink_acknowledge_status(inlink, &status, &pts)) { \
+ unsigned i; \
+ for (i = 0; i < filter->nb_outputs; i++) \
+ ff_outlink_set_status(filter->outputs[i], status, pts); \
+ return 0; \
+ } \
+} while (0)
+
+/**
+ * Forward the frame_wanted_out flag from an output link to an input link.
+ * If the flag is set, this macro will return immediately.
+ */
+#define FF_FILTER_FORWARD_WANTED(outlink, inlink) do { \
+ if (ff_outlink_frame_wanted(outlink)) { \
+ ff_inlink_request_frame(inlink); \
+ return 0; \
+ } \
+} while (0)
+
#endif /* AVFILTER_FILTERS_H */
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