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lavfi: add helper functions and macros for activate.

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This commit is contained in:
Nicolas George 2017-08-31 17:05:04 +02:00
parent e952d4b7ac
commit 76613618d9
2 changed files with 98 additions and 0 deletions
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20
libavfilter/avfilter.c
View File

@ -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;

78
libavfilter/filters.h
View File

@ -140,6 +140,12 @@ 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.
*/
@ -148,6 +154,11 @@ static inline int ff_outlink_frame_wanted(AVFilterLink *link)
return link->frame_wanted_out;
}
/**
* 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,
@ -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 */