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lavfi: add helpers to consume frames from link FIFOs.

This commit is contained in:
Nicolas George 2016-12-20 14:58:37 +01:00
parent 2e5af443c3
commit d360ddf03b
2 changed files with 94 additions and 0 deletions
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52
libavfilter/avfilter.c
View File

@ -1501,6 +1501,58 @@ int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts
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);
link->dst->is_disabled = !ff_inlink_evaluate_timeline_at_frame(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;

42
libavfilter/filters.h
View File

@ -54,6 +54,48 @@ int ff_inlink_process_commands(AVFilterLink *link, const AVFrame *frame);
*/
int ff_inlink_evaluate_timeline_at_frame(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