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lavfi/avfilter: track whether a filter has been initialized

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Refuse to link uninitialized filters or initialize a filter twice.
This commit is contained in:
Anton Khirnov 2023-01-17 10:51:57 +01:00
parent 80cf509e73
commit 4310b66b98
2 changed files with 16 additions and 0 deletions
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12
libavfilter/avfilter.c
View File

@ -158,6 +158,11 @@ int avfilter_link(AVFilterContext *src, unsigned srcpad,
src->outputs[srcpad] || dst->inputs[dstpad])
return AVERROR(EINVAL);
if (!src->internal->initialized || !dst->internal->initialized) {
av_log(src, AV_LOG_ERROR, "Filters must be initialized before linking.\n");
return AVERROR(EINVAL);
}
if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
av_log(src, AV_LOG_ERROR,
"Media type mismatch between the '%s' filter output pad %d (%s) and the '%s' filter input pad %d (%s)\n",
@ -851,6 +856,11 @@ int avfilter_init_dict(AVFilterContext *ctx, AVDictionary **options)
{
int ret = 0;
if (ctx->internal->initialized) {
av_log(ctx, AV_LOG_ERROR, "Filter already initialized\n");
return AVERROR(EINVAL);
}
ret = av_opt_set_dict2(ctx, options, AV_OPT_SEARCH_CHILDREN);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Error applying generic filter options.\n");
@ -877,6 +887,8 @@ int avfilter_init_dict(AVFilterContext *ctx, AVDictionary **options)
return ret;
}
ctx->internal->initialized = 1;
return 0;
}

4
libavfilter/internal.h
View File

@ -137,6 +137,10 @@ struct AVFilterGraphInternal {
struct AVFilterInternal {
avfilter_execute_func *execute;
// 1 when avfilter_init_*() was successfully called on this filter
// 0 otherwise
int initialized;
};
static av_always_inline int ff_filter_execute(AVFilterContext *ctx, avfilter_action_func *func,