yading@10: /*
yading@10:  * filter graph parser
yading@10:  * Copyright (c) 2008 Vitor Sessak
yading@10:  * Copyright (c) 2007 Bobby Bingham
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include <string.h>
yading@10: #include <stdio.h>
yading@10: 
yading@10: #include "libavutil/avstring.h"
yading@10: #include "libavutil/mem.h"
yading@10: #include "avfilter.h"
yading@10: 
yading@10: #define WHITESPACES " \n\t"
yading@10: 
yading@10: /**
yading@10:  * Link two filters together.
yading@10:  *
yading@10:  * @see avfilter_link()
yading@10:  */
yading@10: static int link_filter(AVFilterContext *src, int srcpad,
yading@10:                        AVFilterContext *dst, int dstpad,
yading@10:                        void *log_ctx)
yading@10: {
yading@10:     int ret;
yading@10:     if ((ret = avfilter_link(src, srcpad, dst, dstpad))) {
yading@10:         av_log(log_ctx, AV_LOG_ERROR,
yading@10:                "Cannot create the link %s:%d -> %s:%d\n",
yading@10:                src->filter->name, srcpad, dst->filter->name, dstpad);
yading@10:         return ret;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Parse the name of a link, which has the format "[linkname]".
yading@10:  *
yading@10:  * @return a pointer (that need to be freed after use) to the name
yading@10:  * between parenthesis
yading@10:  */
yading@10: static char *parse_link_name(const char **buf, void *log_ctx)
yading@10: {
yading@10:     const char *start = *buf;
yading@10:     char *name;
yading@10:     (*buf)++;
yading@10: 
yading@10:     name = av_get_token(buf, "]");
yading@10: 
yading@10:     if (!name[0]) {
yading@10:         av_log(log_ctx, AV_LOG_ERROR,
yading@10:                "Bad (empty?) label found in the following: \"%s\".\n", start);
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     if (*(*buf)++ != ']') {
yading@10:         av_log(log_ctx, AV_LOG_ERROR,
yading@10:                "Mismatched '[' found in the following: \"%s\".\n", start);
yading@10:     fail:
yading@10:         av_freep(&name);
yading@10:     }
yading@10: 
yading@10:     return name;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Create an instance of a filter, initialize and insert it in the
yading@10:  * filtergraph in *ctx.
yading@10:  *
yading@10:  * @param filt_ctx put here a filter context in case of successful creation and configuration, NULL otherwise.
yading@10:  * @param ctx the filtergraph context
yading@10:  * @param index an index which is supposed to be unique for each filter instance added to the filtergraph
yading@10:  * @param filt_name the name of the filter to create
yading@10:  * @param args the arguments provided to the filter during its initialization
yading@10:  * @param log_ctx the log context to use
yading@10:  * @return 0 in case of success, a negative AVERROR code otherwise
yading@10:  */
yading@10: static int create_filter(AVFilterContext **filt_ctx, AVFilterGraph *ctx, int index,
yading@10:                          const char *filt_name, const char *args, void *log_ctx)
yading@10: {
yading@10:     AVFilter *filt;
yading@10:     char inst_name[30];
yading@10:     char tmp_args[256];
yading@10:     int ret;
yading@10: 
yading@10:     snprintf(inst_name, sizeof(inst_name), "Parsed_%s_%d", filt_name, index);
yading@10: 
yading@10:     filt = avfilter_get_by_name(filt_name);
yading@10: 
yading@10:     if (!filt) {
yading@10:         av_log(log_ctx, AV_LOG_ERROR,
yading@10:                "No such filter: '%s'\n", filt_name);
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     *filt_ctx = avfilter_graph_alloc_filter(ctx, filt, inst_name);
yading@10:     if (!*filt_ctx) {
yading@10:         av_log(log_ctx, AV_LOG_ERROR,
yading@10:                "Error creating filter '%s'\n", filt_name);
yading@10:         return AVERROR(ENOMEM);
yading@10:     }
yading@10: 
yading@10:     if (!strcmp(filt_name, "scale") && args && !strstr(args, "flags") &&
yading@10:         ctx->scale_sws_opts) {
yading@10:         snprintf(tmp_args, sizeof(tmp_args), "%s:%s",
yading@10:                  args, ctx->scale_sws_opts);
yading@10:         args = tmp_args;
yading@10:     }
yading@10: 
yading@10:     ret = avfilter_init_str(*filt_ctx, args);
yading@10:     if (ret < 0) {
yading@10:         av_log(log_ctx, AV_LOG_ERROR,
yading@10:                "Error initializing filter '%s' with args '%s'\n", filt_name, args);
yading@10:         return ret;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Parse a string of the form FILTER_NAME[=PARAMS], and create a
yading@10:  * corresponding filter instance which is added to graph with
yading@10:  * create_filter().
yading@10:  *
yading@10:  * @param filt_ctx Pointer that is set to the created and configured filter
yading@10:  *                 context on success, set to NULL on failure.
yading@10:  * @param filt_ctx put here a pointer to the created filter context on
yading@10:  * success, NULL otherwise
yading@10:  * @param buf pointer to the buffer to parse, *buf will be updated to
yading@10:  * point to the char next after the parsed string
yading@10:  * @param index an index which is assigned to the created filter
yading@10:  * instance, and which is supposed to be unique for each filter
yading@10:  * instance added to the filtergraph
yading@10:  * @return 0 in case of success, a negative AVERROR code otherwise
yading@10:  */
yading@10: static int parse_filter(AVFilterContext **filt_ctx, const char **buf, AVFilterGraph *graph,
yading@10:                         int index, void *log_ctx)
yading@10: {
yading@10:     char *opts = NULL;
yading@10:     char *name = av_get_token(buf, "=,;[\n");
yading@10:     int ret;
yading@10: 
yading@10:     if (**buf == '=') {
yading@10:         (*buf)++;
yading@10:         opts = av_get_token(buf, "[],;\n");
yading@10:     }
yading@10: 
yading@10:     ret = create_filter(filt_ctx, graph, index, name, opts, log_ctx);
yading@10:     av_free(name);
yading@10:     av_free(opts);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: AVFilterInOut *avfilter_inout_alloc(void)
yading@10: {
yading@10:     return av_mallocz(sizeof(AVFilterInOut));
yading@10: }
yading@10: 
yading@10: void avfilter_inout_free(AVFilterInOut **inout)
yading@10: {
yading@10:     while (*inout) {
yading@10:         AVFilterInOut *next = (*inout)->next;
yading@10:         av_freep(&(*inout)->name);
yading@10:         av_freep(inout);
yading@10:         *inout = next;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static AVFilterInOut *extract_inout(const char *label, AVFilterInOut **links)
yading@10: {
yading@10:     AVFilterInOut *ret;
yading@10: 
yading@10:     while (*links && (!(*links)->name || strcmp((*links)->name, label)))
yading@10:         links = &((*links)->next);
yading@10: 
yading@10:     ret = *links;
yading@10: 
yading@10:     if (ret) {
yading@10:         *links = ret->next;
yading@10:         ret->next = NULL;
yading@10:     }
yading@10: 
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static void insert_inout(AVFilterInOut **inouts, AVFilterInOut *element)
yading@10: {
yading@10:     element->next = *inouts;
yading@10:     *inouts = element;
yading@10: }
yading@10: 
yading@10: static void append_inout(AVFilterInOut **inouts, AVFilterInOut **element)
yading@10: {
yading@10:     while (*inouts && (*inouts)->next)
yading@10:         inouts = &((*inouts)->next);
yading@10: 
yading@10:     if (!*inouts)
yading@10:         *inouts = *element;
yading@10:     else
yading@10:         (*inouts)->next = *element;
yading@10:     *element = NULL;
yading@10: }
yading@10: 
yading@10: static int link_filter_inouts(AVFilterContext *filt_ctx,
yading@10:                               AVFilterInOut **curr_inputs,
yading@10:                               AVFilterInOut **open_inputs, void *log_ctx)
yading@10: {
yading@10:     int pad, ret;
yading@10: 
yading@10:     for (pad = 0; pad < filt_ctx->nb_inputs; pad++) {
yading@10:         AVFilterInOut *p = *curr_inputs;
yading@10: 
yading@10:         if (p) {
yading@10:             *curr_inputs = (*curr_inputs)->next;
yading@10:             p->next = NULL;
yading@10:         } else if (!(p = av_mallocz(sizeof(*p))))
yading@10:             return AVERROR(ENOMEM);
yading@10: 
yading@10:         if (p->filter_ctx) {
yading@10:             ret = link_filter(p->filter_ctx, p->pad_idx, filt_ctx, pad, log_ctx);
yading@10:             av_free(p->name);
yading@10:             av_free(p);
yading@10:             if (ret < 0)
yading@10:                 return ret;
yading@10:         } else {
yading@10:             p->filter_ctx = filt_ctx;
yading@10:             p->pad_idx = pad;
yading@10:             append_inout(open_inputs, &p);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (*curr_inputs) {
yading@10:         av_log(log_ctx, AV_LOG_ERROR,
yading@10:                "Too many inputs specified for the \"%s\" filter.\n",
yading@10:                filt_ctx->filter->name);
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     pad = filt_ctx->nb_outputs;
yading@10:     while (pad--) {
yading@10:         AVFilterInOut *currlinkn = av_mallocz(sizeof(AVFilterInOut));
yading@10:         if (!currlinkn)
yading@10:             return AVERROR(ENOMEM);
yading@10:         currlinkn->filter_ctx  = filt_ctx;
yading@10:         currlinkn->pad_idx = pad;
yading@10:         insert_inout(curr_inputs, currlinkn);
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int parse_inputs(const char **buf, AVFilterInOut **curr_inputs,
yading@10:                         AVFilterInOut **open_outputs, void *log_ctx)
yading@10: {
yading@10:     AVFilterInOut *parsed_inputs = NULL;
yading@10:     int pad = 0;
yading@10: 
yading@10:     while (**buf == '[') {
yading@10:         char *name = parse_link_name(buf, log_ctx);
yading@10:         AVFilterInOut *match;
yading@10: 
yading@10:         if (!name)
yading@10:             return AVERROR(EINVAL);
yading@10: 
yading@10:         /* First check if the label is not in the open_outputs list */
yading@10:         match = extract_inout(name, open_outputs);
yading@10: 
yading@10:         if (match) {
yading@10:             av_free(name);
yading@10:         } else {
yading@10:             /* Not in the list, so add it as an input */
yading@10:             if (!(match = av_mallocz(sizeof(AVFilterInOut)))) {
yading@10:                 av_free(name);
yading@10:                 return AVERROR(ENOMEM);
yading@10:             }
yading@10:             match->name    = name;
yading@10:             match->pad_idx = pad;
yading@10:         }
yading@10: 
yading@10:         append_inout(&parsed_inputs, &match);
yading@10: 
yading@10:         *buf += strspn(*buf, WHITESPACES);
yading@10:         pad++;
yading@10:     }
yading@10: 
yading@10:     append_inout(&parsed_inputs, curr_inputs);
yading@10:     *curr_inputs = parsed_inputs;
yading@10: 
yading@10:     return pad;
yading@10: }
yading@10: 
yading@10: static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs,
yading@10:                          AVFilterInOut **open_inputs,
yading@10:                          AVFilterInOut **open_outputs, void *log_ctx)
yading@10: {
yading@10:     int ret, pad = 0;
yading@10: 
yading@10:     while (**buf == '[') {
yading@10:         char *name = parse_link_name(buf, log_ctx);
yading@10:         AVFilterInOut *match;
yading@10: 
yading@10:         AVFilterInOut *input = *curr_inputs;
yading@10: 
yading@10:         if (!name)
yading@10:             return AVERROR(EINVAL);
yading@10: 
yading@10:         if (!input) {
yading@10:             av_log(log_ctx, AV_LOG_ERROR,
yading@10:                    "No output pad can be associated to link label '%s'.\n", name);
yading@10:             av_free(name);
yading@10:             return AVERROR(EINVAL);
yading@10:         }
yading@10:         *curr_inputs = (*curr_inputs)->next;
yading@10: 
yading@10:         /* First check if the label is not in the open_inputs list */
yading@10:         match = extract_inout(name, open_inputs);
yading@10: 
yading@10:         if (match) {
yading@10:             if ((ret = link_filter(input->filter_ctx, input->pad_idx,
yading@10:                                    match->filter_ctx, match->pad_idx, log_ctx)) < 0) {
yading@10:                 av_free(name);
yading@10:                 return ret;
yading@10:             }
yading@10:             av_free(match->name);
yading@10:             av_free(name);
yading@10:             av_free(match);
yading@10:             av_free(input);
yading@10:         } else {
yading@10:             /* Not in the list, so add the first input as a open_output */
yading@10:             input->name = name;
yading@10:             insert_inout(open_outputs, input);
yading@10:         }
yading@10:         *buf += strspn(*buf, WHITESPACES);
yading@10:         pad++;
yading@10:     }
yading@10: 
yading@10:     return pad;
yading@10: }
yading@10: 
yading@10: static int parse_sws_flags(const char **buf, AVFilterGraph *graph)
yading@10: {
yading@10:     char *p = strchr(*buf, ';');
yading@10: 
yading@10:     if (strncmp(*buf, "sws_flags=", 10))
yading@10:         return 0;
yading@10: 
yading@10:     if (!p) {
yading@10:         av_log(graph, AV_LOG_ERROR, "sws_flags not terminated with ';'.\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     *buf += 4;  // keep the 'flags=' part
yading@10: 
yading@10:     av_freep(&graph->scale_sws_opts);
yading@10:     if (!(graph->scale_sws_opts = av_mallocz(p - *buf + 1)))
yading@10:         return AVERROR(ENOMEM);
yading@10:     av_strlcpy(graph->scale_sws_opts, *buf, p - *buf + 1);
yading@10: 
yading@10:     *buf = p + 1;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int avfilter_graph_parse2(AVFilterGraph *graph, const char *filters,
yading@10:                           AVFilterInOut **inputs,
yading@10:                           AVFilterInOut **outputs)
yading@10: {
yading@10:     int index = 0, ret = 0;
yading@10:     char chr = 0;
yading@10: 
yading@10:     AVFilterInOut *curr_inputs = NULL, *open_inputs = NULL, *open_outputs = NULL;
yading@10: 
yading@10:     filters += strspn(filters, WHITESPACES);
yading@10: 
yading@10:     if ((ret = parse_sws_flags(&filters, graph)) < 0)
yading@10:         goto fail;
yading@10: 
yading@10:     do {
yading@10:         AVFilterContext *filter;
yading@10:         filters += strspn(filters, WHITESPACES);
yading@10: 
yading@10:         if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, graph)) < 0)
yading@10:             goto end;
yading@10:         if ((ret = parse_filter(&filter, &filters, graph, index, graph)) < 0)
yading@10:             goto end;
yading@10: 
yading@10: 
yading@10:         if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, graph)) < 0)
yading@10:             goto end;
yading@10: 
yading@10:         if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
yading@10:                                  graph)) < 0)
yading@10:             goto end;
yading@10: 
yading@10:         filters += strspn(filters, WHITESPACES);
yading@10:         chr = *filters++;
yading@10: 
yading@10:         if (chr == ';' && curr_inputs)
yading@10:             append_inout(&open_outputs, &curr_inputs);
yading@10:         index++;
yading@10:     } while (chr == ',' || chr == ';');
yading@10: 
yading@10:     if (chr) {
yading@10:         av_log(graph, AV_LOG_ERROR,
yading@10:                "Unable to parse graph description substring: \"%s\"\n",
yading@10:                filters - 1);
yading@10:         ret = AVERROR(EINVAL);
yading@10:         goto end;
yading@10:     }
yading@10: 
yading@10:     append_inout(&open_outputs, &curr_inputs);
yading@10: 
yading@10: 
yading@10:     *inputs  = open_inputs;
yading@10:     *outputs = open_outputs;
yading@10:     return 0;
yading@10: 
yading@10:  fail:end:
yading@10:     while (graph->nb_filters)
yading@10:         avfilter_free(graph->filters[0]);
yading@10:     av_freep(&graph->filters);
yading@10:     avfilter_inout_free(&open_inputs);
yading@10:     avfilter_inout_free(&open_outputs);
yading@10:     avfilter_inout_free(&curr_inputs);
yading@10: 
yading@10:     *inputs  = NULL;
yading@10:     *outputs = NULL;
yading@10: 
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
yading@10:                          AVFilterInOut **open_inputs_ptr, AVFilterInOut **open_outputs_ptr,
yading@10:                          void *log_ctx)
yading@10: {
yading@10: #if 0
yading@10:     int ret;
yading@10:     AVFilterInOut *open_inputs  = open_inputs_ptr  ? *open_inputs_ptr  : NULL;
yading@10:     AVFilterInOut *open_outputs = open_outputs_ptr ? *open_outputs_ptr : NULL;
yading@10:     AVFilterInOut *cur, *match, *inputs = NULL, *outputs = NULL;
yading@10: 
yading@10:     if ((ret = avfilter_graph_parse2(graph, filters, &inputs, &outputs)) < 0)
yading@10:         goto fail;
yading@10: 
yading@10:     /* First input can be omitted if it is "[in]" */
yading@10:     if (inputs && !inputs->name)
yading@10:         inputs->name = av_strdup("in");
yading@10:     for (cur = inputs; cur; cur = cur->next) {
yading@10:         if (!cur->name) {
yading@10:               av_log(log_ctx, AV_LOG_ERROR,
yading@10:                      "Not enough inputs specified for the \"%s\" filter.\n",
yading@10:                      cur->filter_ctx->filter->name);
yading@10:               ret = AVERROR(EINVAL);
yading@10:               goto fail;
yading@10:         }
yading@10:         if (!(match = extract_inout(cur->name, &open_outputs)))
yading@10:             continue;
yading@10:         ret = avfilter_link(match->filter_ctx, match->pad_idx,
yading@10:                             cur->filter_ctx,   cur->pad_idx);
yading@10:         avfilter_inout_free(&match);
yading@10:         if (ret < 0)
yading@10:             goto fail;
yading@10:     }
yading@10: 
yading@10:     /* Last output can be omitted if it is "[out]" */
yading@10:     if (outputs && !outputs->name)
yading@10:         outputs->name = av_strdup("out");
yading@10:     for (cur = outputs; cur; cur = cur->next) {
yading@10:         if (!cur->name) {
yading@10:             av_log(log_ctx, AV_LOG_ERROR,
yading@10:                    "Invalid filterchain containing an unlabelled output pad: \"%s\"\n",
yading@10:                    filters);
yading@10:             ret = AVERROR(EINVAL);
yading@10:             goto fail;
yading@10:         }
yading@10:         if (!(match = extract_inout(cur->name, &open_inputs)))
yading@10:             continue;
yading@10:         ret = avfilter_link(cur->filter_ctx,   cur->pad_idx,
yading@10:                             match->filter_ctx, match->pad_idx);
yading@10:         avfilter_inout_free(&match);
yading@10:         if (ret < 0)
yading@10:             goto fail;
yading@10:     }
yading@10: 
yading@10:  fail:
yading@10:     if (ret < 0) {
yading@10:         while (graph->nb_filters)
yading@10:             avfilter_free(graph->filters[0]);
yading@10:         av_freep(&graph->filters);
yading@10:     }
yading@10:     avfilter_inout_free(&inputs);
yading@10:     avfilter_inout_free(&outputs);
yading@10:     /* clear open_in/outputs only if not passed as parameters */
yading@10:     if (open_inputs_ptr) *open_inputs_ptr = open_inputs;
yading@10:     else avfilter_inout_free(&open_inputs);
yading@10:     if (open_outputs_ptr) *open_outputs_ptr = open_outputs;
yading@10:     else avfilter_inout_free(&open_outputs);
yading@10:     return ret;
yading@10: }
yading@10: #else
yading@10:     int index = 0, ret = 0;
yading@10:     char chr = 0;
yading@10: 
yading@10:     AVFilterInOut *curr_inputs = NULL;
yading@10:     AVFilterInOut *open_inputs  = open_inputs_ptr  ? *open_inputs_ptr  : NULL;
yading@10:     AVFilterInOut *open_outputs = open_outputs_ptr ? *open_outputs_ptr : NULL;
yading@10: 
yading@10:     if ((ret = parse_sws_flags(&filters, graph)) < 0)
yading@10:         goto end;
yading@10: 
yading@10:     do {
yading@10:         AVFilterContext *filter;
yading@10:         const char *filterchain = filters;
yading@10:         filters += strspn(filters, WHITESPACES);
yading@10: 
yading@10:         if ((ret = parse_inputs(&filters, &curr_inputs, &open_outputs, log_ctx)) < 0)
yading@10:             goto end;
yading@10: 
yading@10:         if ((ret = parse_filter(&filter, &filters, graph, index, log_ctx)) < 0)
yading@10:             goto end;
yading@10: 
yading@10:         if (filter->input_count == 1 && !curr_inputs && !index) {
yading@10:             /* First input pad, assume it is "[in]" if not specified */
yading@10:             const char *tmp = "[in]";
yading@10:             if ((ret = parse_inputs(&tmp, &curr_inputs, &open_outputs, log_ctx)) < 0)
yading@10:                 goto end;
yading@10:         }
yading@10: 
yading@10:         if ((ret = link_filter_inouts(filter, &curr_inputs, &open_inputs, log_ctx)) < 0)
yading@10:             goto end;
yading@10: 
yading@10:         if ((ret = parse_outputs(&filters, &curr_inputs, &open_inputs, &open_outputs,
yading@10:                                  log_ctx)) < 0)
yading@10:             goto end;
yading@10: 
yading@10:         filters += strspn(filters, WHITESPACES);
yading@10:         chr = *filters++;
yading@10: 
yading@10:         if (chr == ';' && curr_inputs) {
yading@10:             av_log(log_ctx, AV_LOG_ERROR,
yading@10:                    "Invalid filterchain containing an unlabelled output pad: \"%s\"\n",
yading@10:                    filterchain);
yading@10:             ret = AVERROR(EINVAL);
yading@10:             goto end;
yading@10:         }
yading@10:         index++;
yading@10:     } while (chr == ',' || chr == ';');
yading@10: 
yading@10:     if (chr) {
yading@10:         av_log(log_ctx, AV_LOG_ERROR,
yading@10:                "Unable to parse graph description substring: \"%s\"\n",
yading@10:                filters - 1);
yading@10:         ret = AVERROR(EINVAL);
yading@10:         goto end;
yading@10:     }
yading@10: 
yading@10:     if (curr_inputs) {
yading@10:         /* Last output pad, assume it is "[out]" if not specified */
yading@10:         const char *tmp = "[out]";
yading@10:         if ((ret = parse_outputs(&tmp, &curr_inputs, &open_inputs, &open_outputs,
yading@10:                                  log_ctx)) < 0)
yading@10:             goto end;
yading@10:     }
yading@10: 
yading@10: end:
yading@10:     /* clear open_in/outputs only if not passed as parameters */
yading@10:     if (open_inputs_ptr) *open_inputs_ptr = open_inputs;
yading@10:     else avfilter_inout_free(&open_inputs);
yading@10:     if (open_outputs_ptr) *open_outputs_ptr = open_outputs;
yading@10:     else avfilter_inout_free(&open_outputs);
yading@10:     avfilter_inout_free(&curr_inputs);
yading@10: 
yading@10:     if (ret < 0) {
yading@10:         while (graph->nb_filters)
yading@10:             avfilter_free(graph->filters[0]);
yading@10:         av_freep(&graph->filters);
yading@10:     }
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: #endif