Allocate a context for a given bitstream filter. The caller must fill in the
context parameters as described in the documentation and then call
av_bsf_init() before sending any data to the filter.
@param filter the filter for which to allocate an instance.
@param ctx a pointer into which the pointer to the newly-allocated context
will be written. It must be freed with av_bsf_free() after the
filtering is done.
@return 0 on success, a negative AVERROR code on failure
Allocate a context for a given bitstream filter. The caller must fill in the context parameters as described in the documentation and then call av_bsf_init() before sending any data to the filter.
@param filter the filter for which to allocate an instance. @param ctx a pointer into which the pointer to the newly-allocated context will be written. It must be freed with av_bsf_free() after the filtering is done.
@return 0 on success, a negative AVERROR code on failure