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graphparser: add avfilter_graph_parse2().
Unlike avfilter_graph_parse(), it returns unlinked inputs and outputs to the caller, which allows parsing of graphs where inputs/outputs are not known in advance.
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@ -91,11 +91,11 @@ void avfilter_graph_free(AVFilterGraph **graph);
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/**
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* A linked-list of the inputs/outputs of the filter chain.
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*
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* This is mainly useful for avfilter_graph_parse(), since this
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* function may accept a description of a graph with not connected
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* input/output pads. This struct specifies, per each not connected
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* pad contained in the graph, the filter context and the pad index
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* required for establishing a link.
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* This is mainly useful for avfilter_graph_parse() / avfilter_graph_parse2(),
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* where it is used to communicate open (unlinked) inputs and outputs from and
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* to the caller.
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* This struct specifies, per each not connected pad contained in the graph, the
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* filter context and the pad index required for establishing a link.
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*/
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typedef struct AVFilterInOut {
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/** unique name for this input/output in the list */
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@ -124,4 +124,38 @@ int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
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AVFilterInOut *inputs, AVFilterInOut *outputs,
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void *log_ctx);
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/**
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* Add a graph described by a string to a graph.
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*
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* @param[in] graph the filter graph where to link the parsed graph context
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* @param[in] filters string to be parsed
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* @param[out] inputs a linked list of all free (unlinked) inputs of the
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* parsed graph will be returned here. It is to be freed
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* by the caller using avfilter_inout_free().
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* @param[out] outputs a linked list of all free (unlinked) outputs of the
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* parsed graph will be returned here. It is to be freed by the
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* caller using avfilter_inout_free().
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* @return zero on success, a negative AVERROR code on error
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*
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* @note the difference between avfilter_graph_parse2() and
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* avfilter_graph_parse() is that in avfilter_graph_parse(), the caller provides
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* the lists of inputs and outputs, which therefore must be known before calling
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* the function. On the other hand, avfilter_graph_parse2() \em returns the
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* inputs and outputs that are left unlinked after parsing the graph and the
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* caller then deals with them. Another difference is that in
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* avfilter_graph_parse(), the inputs parameter describes inputs of the
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* <em>already existing</em> part of the graph; i.e. from the point of view of
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* the newly created part, they are outputs. Similarly the outputs parameter
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* describes outputs of the already existing filters, which are provided as
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* inputs to the parsed filters.
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* avfilter_graph_parse2() takes the opposite approach -- it makes no reference
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* whatsoever to already existing parts of the graph and the inputs parameter
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* will on return contain inputs of the newly parsed part of the graph.
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* Analogously the outputs parameter will contain outputs of the newly created
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* filters.
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*/
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int avfilter_graph_parse2(AVFilterGraph *graph, const char *filters,
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AVFilterInOut **inputs,
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AVFilterInOut **outputs);
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#endif /* AVFILTER_AVFILTERGRAPH_H */
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@ -184,13 +184,15 @@ static AVFilterInOut *extract_inout(const char *label, AVFilterInOut **links)
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{
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AVFilterInOut *ret;
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while (*links && strcmp((*links)->name, label))
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while (*links && (!(*links)->name || strcmp((*links)->name, label)))
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links = &((*links)->next);
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ret = *links;
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if (ret)
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if (ret) {
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*links = ret->next;
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ret->next = NULL;
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}
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return ret;
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}
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@ -201,6 +203,18 @@ static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
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*inouts = element;
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}
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static void append_inout(AVFilterInOut **inouts, AVFilterInOut **element)
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{
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while (*inouts && (*inouts)->next)
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inouts = &((*inouts)->next);
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if (!*inouts)
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*inouts = *element;
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else
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(*inouts)->next = *element;
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*element = NULL;
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}
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static int link_filter_inouts(AVFilterContext *filt_ctx,
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AVFilterInOut **curr_inputs,
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AVFilterInOut **open_inputs, void *log_ctx)
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@ -209,14 +223,11 @@ static int link_filter_inouts(AVFilterContext *filt_ctx,
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while (pad--) {
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AVFilterInOut *p = *curr_inputs;
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if (!p) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Not enough inputs specified for the \"%s\" filter.\n",
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filt_ctx->filter->name);
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return AVERROR(EINVAL);
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}
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*curr_inputs = (*curr_inputs)->next;
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if (p)
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*curr_inputs = (*curr_inputs)->next;
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else if (!(p = av_mallocz(sizeof(*p))))
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return AVERROR(ENOMEM);
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if (p->filter_ctx) {
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if ((ret = link_filter(p->filter_ctx, p->pad_idx, filt_ctx, pad, log_ctx)) < 0)
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@ -329,18 +340,22 @@ static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs,
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return pad;
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}
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int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
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AVFilterInOut *open_inputs,
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AVFilterInOut *open_outputs, void *log_ctx)
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#if FF_API_GRAPH_AVCLASS
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#define log_ctx graph
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#else
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#define log_ctx NULL
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#endif
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int avfilter_graph_parse2(AVFilterGraph *graph, const char *filters,
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AVFilterInOut **inputs,
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AVFilterInOut **outputs)
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{
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int index = 0, ret;
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char chr = 0;
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AVFilterInOut *curr_inputs = NULL;
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AVFilterInOut *curr_inputs = NULL, *open_inputs = NULL, *open_outputs = NULL;
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do {
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AVFilterContext *filter;
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const char *filterchain = filters;
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filters += strspn(filters, WHITESPACES);
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if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, log_ctx)) < 0)
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@ -349,12 +364,6 @@ int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
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if ((ret = parse_filter(&filter, &filters, graph, index, log_ctx)) < 0)
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goto fail;
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if (filter->input_count == 1 && !curr_inputs && !index) {
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/* First input can be omitted if it is "[in]" */
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const char *tmp = "[in]";
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if ((ret = parse_inputs(&tmp, &curr_inputs, &open_outputs, log_ctx)) < 0)
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goto fail;
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}
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if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, log_ctx)) < 0)
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goto fail;
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@ -366,13 +375,8 @@ int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
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filters += strspn(filters, WHITESPACES);
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chr = *filters++;
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if (chr == ';' && curr_inputs) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Invalid filterchain containing an unlabelled output pad: \"%s\"\n",
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filterchain);
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ret = AVERROR(EINVAL);
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goto fail;
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}
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if (chr == ';' && curr_inputs)
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append_inout(&open_outputs, &curr_inputs);
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index++;
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} while (chr == ',' || chr == ';');
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@ -384,14 +388,10 @@ int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
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goto fail;
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}
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if (open_inputs && !strcmp(open_inputs->name, "out") && curr_inputs) {
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/* Last output can be omitted if it is "[out]" */
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const char *tmp = "[out]";
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if ((ret = parse_outputs(&tmp, &curr_inputs, &open_inputs, &open_outputs,
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log_ctx)) < 0)
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goto fail;
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}
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append_inout(&open_outputs, &curr_inputs);
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*inputs = open_inputs;
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*outputs = open_outputs;
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return 0;
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fail:
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@ -401,5 +401,73 @@ int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
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free_inout(open_inputs);
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free_inout(open_outputs);
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free_inout(curr_inputs);
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*inputs = NULL;
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*outputs = NULL;
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return ret;
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}
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#undef log_ctx
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int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
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AVFilterInOut *open_inputs,
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AVFilterInOut *open_outputs, void *log_ctx)
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{
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int ret;
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AVFilterInOut *cur, *match, *inputs = NULL, *outputs = NULL;
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if ((ret = avfilter_graph_parse2(graph, filters, &inputs, &outputs)) < 0)
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goto fail;
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/* First input can be omitted if it is "[in]" */
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if (inputs && !inputs->name)
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inputs->name = av_strdup("in");
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for (cur = inputs; cur; cur = cur->next) {
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if (!cur->name) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Not enough inputs specified for the \"%s\" filter.\n",
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cur->filter_ctx->filter->name);
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ret = AVERROR(EINVAL);
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goto fail;
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}
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if (!(match = extract_inout(cur->name, &open_outputs)))
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continue;
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ret = avfilter_link(match->filter_ctx, match->pad_idx,
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cur->filter_ctx, cur->pad_idx);
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free_inout(match);
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if (ret < 0)
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goto fail;
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}
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/* Last output can be omitted if it is "[out]" */
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if (outputs && !outputs->name)
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outputs->name = av_strdup("out");
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for (cur = outputs; cur; cur = cur->next) {
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if (!cur->name) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Invalid filterchain containing an unlabelled output pad: \"%s\"\n",
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filters);
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ret = AVERROR(EINVAL);
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goto fail;
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}
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if (!(match = extract_inout(cur->name, &open_inputs)))
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continue;
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ret = avfilter_link(cur->filter_ctx, cur->pad_idx,
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match->filter_ctx, match->pad_idx);
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free_inout(match);
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if (ret < 0)
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goto fail;
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}
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fail:
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if (ret < 0) {
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for (; graph->filter_count > 0; graph->filter_count--)
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avfilter_free(graph->filters[graph->filter_count - 1]);
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av_freep(&graph->filters);
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}
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free_inout(inputs);
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free_inout(outputs);
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free_inout(open_inputs);
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free_inout(open_outputs);
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return ret;
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}
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