Signed-off-by: Nicolas George <geo...@nsup.org>
---
libavfilter/avfilter.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++
libavfilter/filters.h | 42 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 94 insertions(+)
Changes in this commit: rename ff_link -> ff_inlink and move to filters.h,
remove the _sure variants and document practice.
diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index d31c9f738b..2183a84395 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -1498,6 +1498,58 @@ int ff_inlink_acknowledge_status(AVFilterLink *link, int
*rstatus)
return 1;
}
+int ff_inlink_check_available_frame(AVFilterLink *link)
+{
+ return ff_framequeue_queued_frames(&link->fifo) > 0;
+}
+
+int ff_inlink_check_available_samples(AVFilterLink *link, unsigned min)
+{
+ uint64_t samples = ff_framequeue_queued_samples(&link->fifo);
+ av_assert1(min);
+ return samples >= min || (link->status_in && samples);
+}
+
+static void consume_update(AVFilterLink *link, const AVFrame *frame)
+{
+ ff_inlink_process_commands(link, frame);
+ ff_inlink_process_timeline(link, frame);
+ link->frame_count_out++;
+}
+
+int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe)
+{
+ AVFrame *frame;
+
+ *rframe = NULL;
+ if (!ff_inlink_check_available_frame(link))
+ return 0;
+ frame = ff_framequeue_take(&link->fifo);
+ consume_update(link, frame);
+ *rframe = frame;
+ return 1;
+}
+
+int ff_inlink_consume_samples(AVFilterLink *link, unsigned min, unsigned max,
+ AVFrame **rframe)
+{
+ AVFrame *frame;
+ int ret;
+
+ av_assert1(min);
+ *rframe = NULL;
+ if (!ff_inlink_check_available_samples(link, min))
+ return 0;
+ if (link->status_in)
+ min = FFMIN(min, ff_framequeue_queued_samples(&link->fifo));
+ ret = take_samples(link, min, link->max_samples, &frame);
+ if (ret < 0)
+ return ret;
+ consume_update(link, frame);
+ *rframe = frame;
+ return 1;
+}
+
int ff_inlink_make_frame_writable(AVFilterLink *link, AVFrame **rframe)
{
AVFrame *frame = *rframe;
diff --git a/libavfilter/filters.h b/libavfilter/filters.h
index 69a29c640f..95df86c911 100644
--- a/libavfilter/filters.h
+++ b/libavfilter/filters.h
@@ -45,6 +45,48 @@ void ff_inlink_process_commands(AVFilterLink *link, const
AVFrame *frame);
void ff_inlink_process_timeline(AVFilterLink *link, const AVFrame *frame);
/**
+ * Test if a frame is available on the link.
+ * @return >0 if a frame is available
+ */
+int ff_inlink_check_available_frame(AVFilterLink *link);
+
+/**
+ * Test if enough samples are available on the link.
+ * @return >0 if enough samples are available
+ * @note on EOF and error, min becomes 1
+ */
+int ff_inlink_check_available_samples(AVFilterLink *link, unsigned min);
+
+/**
+ * Take a frame from the link's FIFO and update the link's stats.
+ *
+ * If ff_inlink_check_available_frame() was previously called, the
+ * preferred way of expressing it is "av_assert1(ret);" immediately after
+ * ff_inlink_consume_frame(). Negative error codes must still be checked.
+ *
+ * @note May trigger process_command() and/or update is_disabled.
+ * @return >0 if a frame is available,
+ * 0 and set rframe to NULL if no frame available,
+ * or AVERROR code
+ */
+int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe);
+
+/**
+ * Take samples from the link's FIFO and update the link's stats.
+ *
+ * If ff_inlink_check_available_samples() was previously called, the
+ * preferred way of expressing it is "av_assert1(ret);" immediately after
+ * ff_inlink_consume_samples(). Negative error codes must still be checked.
+ *
+ * @note May trigger process_command() and/or update is_disabled.
+ * @return >0 if a frame is available,
+ * 0 and set rframe to NULL if no frame available,
+ * or AVERROR code
+ */
+int ff_inlink_consume_samples(AVFilterLink *link, unsigned min, unsigned max,
+ AVFrame **rframe);
+
+/**
* Make sure a frame is writable.
* This is similar to av_frame_make_writable() except it uses the link's
* buffer allocation callback, and therefore allows direct rendering.
--
2.11.0
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
