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avfilter: Add command passing support

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
2011-08-28 20:46:31 +02:00
parent 4becc86139
commit 1e5014c7c7
4 changed files with 83 additions and 1 deletions
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17
libavfilter/avfiltergraph.h
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@@ -136,4 +136,21 @@ int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
AVFilterInOut **inputs, AVFilterInOut **outputs,
void *log_ctx);
/**
* Send a command to one or more filter instances.
*
* @param graph the filter graph
* @param target the filter(s) to which the command should be sent
* "all" sends to all filters
* otherwise it can be a filter or filter instance name
* which will send the command to all matching filters.
* @param cmd the command to sent, for handling simplicity all commands must be alphanumeric only
* @param arg the argument for the command
* @param res a buffer with size res_size where the filter(s) can return a response.
*
* @returns >=0 on success otherwise an error code.
* AVERROR(ENOSYS) on unsupported commands
*/
int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags);
#endif /* AVFILTER_AVFILTERGRAPH_H */