X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavfilter%2Favfiltergraph.c;h=8c43251c4cc11ce32fc1ef3a41fe0961351513ec;hb=70749c483c53312faa83ff3890fa4e2f7135453d;hp=a2dc93fafcbba141160a0a3884ffdd6de7c04eb5;hpb=c4913b812ddac9b85fb0b213fc5433c75bf81fa8;p=ffmpeg

diff --git a/libavfilter/avfiltergraph.c b/libavfilter/avfiltergraph.c
index a2dc93fafcb..8c43251c4cc 100644
--- a/libavfilter/avfiltergraph.c
+++ b/libavfilter/avfiltergraph.c
@@ -1,22 +1,22 @@
 /*
  * filter graphs
- * copyright (c) 2008 Vitor Sessak
- * copyright (c) 2007 Bobby Bingham
+ * Copyright (c) 2008 Vitor Sessak
+ * Copyright (c) 2007 Bobby Bingham
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
@@ -25,137 +25,161 @@
 
 #include "avfilter.h"
 #include "avfiltergraph.h"
+#include "internal.h"
 
+AVFilterGraph *avfilter_graph_alloc(void)
+{
+    return av_mallocz(sizeof(AVFilterGraph));
+}
 
-/** Linked-list of filters to create for an AVFilterGraphDesc */
-typedef struct AVFilterGraphDescFilter
+void avfilter_graph_free(AVFilterGraph **graph)
 {
-    int index;              ///< filter instance index
-    char *filter;           ///< name of filter type
-    char *args;             ///< filter parameters
-    struct AVFilterGraphDescFilter *next;
-} AVFilterGraphDescFilter;
-
-/** Linked-list of links between filters */
-typedef struct AVFilterGraphDescLink
+    if (!*graph)
+        return;
+    for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
+        avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
+    av_freep(&(*graph)->scale_sws_opts);
+    av_freep(&(*graph)->filters);
+    av_freep(graph);
+}
+
+int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
 {
-    /* TODO: allow referencing pads by name, not just by index */
-    int src;                ///< index of the source filter
-    unsigned srcpad;        ///< index of the output pad on the source filter
+    AVFilterContext **filters = av_realloc(graph->filters,
+                                           sizeof(AVFilterContext*) * (graph->filter_count+1));
+    if (!filters)
+        return AVERROR(ENOMEM);
 
-    int dst;                ///< index of the dest filter
-    unsigned dstpad;        ///< index of the input pad on the dest filter
+    graph->filters = filters;
+    graph->filters[graph->filter_count++] = filter;
 
-    struct AVFilterGraphDescLink *next;
-} AVFilterGraphDescLink;
+    return 0;
+}
 
-/** Linked-list of filter pads to be exported from the graph */
-typedef struct AVFilterGraphDescExport
+int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
+                                 const char *name, const char *args, void *opaque,
+                                 AVFilterGraph *graph_ctx)
 {
-    /* TODO: allow referencing pads by name, not just by index */
-    char *name;             ///< name of the exported pad
-    int filter;             ///< index of the filter
-    unsigned pad;           ///< index of the pad to be exported
+    int ret;
 
-    struct AVFilterGraphDescExport *next;
-} AVFilterGraphDescExport;
+    if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
+        goto fail;
+    if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
+        goto fail;
+    if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
+        goto fail;
+    return 0;
 
-/** Description of a graph to be loaded from a file, etc */
-typedef struct
-{
-    AVFilterGraphDescFilter *filters;   ///< filters in the graph
-    AVFilterGraphDescLink   *links;     ///< links between the filters
-    AVFilterGraphDescExport *inputs;    ///< inputs to export
-    AVFilterGraphDescExport *outputs;   ///< outputs to export
-} AVFilterGraphDesc;
-
-/**
- * For use in av_log
- */
-static const char *log_name(void *p)
-{
-    return "Filter parser";
+fail:
+    if (*filt_ctx)
+        avfilter_free(*filt_ctx);
+    *filt_ctx = NULL;
+    return ret;
 }
 
-static const AVClass filter_parser_class = {
-    "Filter parser",
-    log_name
-};
+int ff_avfilter_graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
+{
+    AVFilterContext *filt;
+    int i, j;
 
-static const AVClass *log_ctx = &filter_parser_class;
+    for (i = 0; i < graph->filter_count; i++) {
+        filt = graph->filters[i];
 
-void avfilter_destroy_graph(AVFilterGraph *graph)
-{
-    for(; graph->filter_count > 0; graph->filter_count --)
-        avfilter_destroy(graph->filters[graph->filter_count - 1]);
-    av_freep(&graph->filters);
+        for (j = 0; j < filt->input_count; j++) {
+            if (!filt->inputs[j] || !filt->inputs[j]->src) {
+                av_log(log_ctx, AV_LOG_ERROR,
+                       "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
+                       filt->input_pads[j].name, filt->name, filt->filter->name);
+                return AVERROR(EINVAL);
+            }
+        }
+
+        for (j = 0; j < filt->output_count; j++) {
+            if (!filt->outputs[j] || !filt->outputs[j]->dst) {
+                av_log(log_ctx, AV_LOG_ERROR,
+                       "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
+                       filt->output_pads[j].name, filt->name, filt->filter->name);
+                return AVERROR(EINVAL);
+            }
+        }
+    }
+
+    return 0;
 }
 
-/* TODO: insert in sorted order */
-void avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
+int ff_avfilter_graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 {
-    graph->filters = av_realloc(graph->filters,
-                                sizeof(AVFilterContext*) * ++graph->filter_count);
-    graph->filters[graph->filter_count - 1] = filter;
+    AVFilterContext *filt;
+    int i, ret;
+
+    for (i=0; i < graph->filter_count; i++) {
+        filt = graph->filters[i];
+
+        if (!filt->output_count) {
+            if ((ret = avfilter_config_links(filt)))
+                return ret;
+        }
+    }
+
+    return 0;
 }
 
-/* search intelligently, once we insert in order */
 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 {
     int i;
 
-    if(!name)
-        return NULL;
-
-    for(i = 0; i < graph->filter_count; i ++)
-        if(graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
+    for (i = 0; i < graph->filter_count; i++)
+        if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
             return graph->filters[i];
 
     return NULL;
 }
 
-static int query_formats(AVFilterGraph *graph)
+static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 {
-    int i, j;
+    int i, j, ret;
+    int scaler_count = 0;
+    char inst_name[30];
 
-    /* ask all the sub-filters for their supported colorspaces */
-    for(i = 0; i < graph->filter_count; i ++) {
-        if(graph->filters[i]->filter->query_formats)
+    /* ask all the sub-filters for their supported media formats */
+    for (i = 0; i < graph->filter_count; i++) {
+        if (graph->filters[i]->filter->query_formats)
             graph->filters[i]->filter->query_formats(graph->filters[i]);
         else
             avfilter_default_query_formats(graph->filters[i]);
     }
 
     /* go through and merge as many format lists as possible */
-    for(i = 0; i < graph->filter_count; i ++) {
+    for (i = 0; i < graph->filter_count; i++) {
         AVFilterContext *filter = graph->filters[i];
 
-        for(j = 0; j < filter->input_count; j ++) {
-            AVFilterLink *link;
-            if(!(link = filter->inputs[j]))
-                continue;
-            if(link->in_formats != link->out_formats) {
-                if(!avfilter_merge_formats(link->in_formats,
-                                           link->out_formats)) {
-                    /* couldn't merge format lists. auto-insert scale filter */
+        for (j = 0; j < filter->input_count; j++) {
+            AVFilterLink *link = filter->inputs[j];
+            if (link && link->in_formats != link->out_formats) {
+                if (!avfilter_merge_formats(link->in_formats,
+                                            link->out_formats)) {
                     AVFilterContext *scale;
+                    char scale_args[256];
+                    /* couldn't merge format lists. auto-insert scale filter */
+                    snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
+                             scaler_count++);
+                    snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
+                    if ((ret = avfilter_graph_create_filter(&scale, avfilter_get_by_name("scale"),
+                                                            inst_name, scale_args, NULL, graph)) < 0)
+                        return ret;
+                    if ((ret = avfilter_insert_filter(link, scale, 0, 0)) < 0)
+                        return ret;
 
-                    if(!(scale =
-                         avfilter_open(avfilter_get_by_name("scale"), NULL)))
-                        return -1;
-                    if(scale->filter->init(scale, NULL, NULL) ||
-                       avfilter_insert_filter(link, scale, 0, 0)) {
-                        avfilter_destroy(scale);
-                        return -1;
-                    }
-
-                    avfilter_graph_add_filter(graph, scale);
                     scale->filter->query_formats(scale);
-                    if(!avfilter_merge_formats(scale-> inputs[0]->in_formats,
-                                              scale-> inputs[0]->out_formats) ||
-                       !avfilter_merge_formats(scale->outputs[0]->in_formats,
-                                              scale->outputs[0]->out_formats))
-                        return -1;
+                    if (((link = scale-> inputs[0]) &&
+                         !avfilter_merge_formats(link->in_formats, link->out_formats)) ||
+                        ((link = scale->outputs[0]) &&
+                         !avfilter_merge_formats(link->in_formats, link->out_formats))) {
+                        av_log(log_ctx, AV_LOG_ERROR,
+                               "Impossible to convert between the formats supported by the filter "
+                               "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
+                        return AVERROR(EINVAL);
+                    }
                 }
             }
         }
@@ -166,7 +190,7 @@ static int query_formats(AVFilterGraph *graph)
 
 static void pick_format(AVFilterLink *link)
 {
-    if(!link || !link->in_formats)
+    if (!link || !link->in_formats)
         return;
 
     link->in_formats->format_count = 1;
@@ -180,474 +204,41 @@ static void pick_formats(AVFilterGraph *graph)
 {
     int i, j;
 
-    for(i = 0; i < graph->filter_count; i ++) {
+    for (i = 0; i < graph->filter_count; i++) {
         AVFilterContext *filter = graph->filters[i];
 
-        for(j = 0; j < filter->input_count; j ++)
+        for (j = 0; j < filter->input_count; j++)
             pick_format(filter->inputs[j]);
-        for(j = 0; j < filter->output_count; j ++)
+        for (j = 0; j < filter->output_count; j++)
             pick_format(filter->outputs[j]);
     }
 }
 
-int avfilter_graph_config_formats(AVFilterGraph *graph)
+int ff_avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 {
+    int ret;
+
     /* find supported formats from sub-filters, and merge along links */
-    if(query_formats(graph))
-        return -1;
+    if ((ret = query_formats(graph, log_ctx)) < 0)
+        return ret;
 
     /* Once everything is merged, it's possible that we'll still have
-     * multiple valid colorspace choices. We pick the first one. */
+     * multiple valid media format choices. We pick the first one. */
     pick_formats(graph);
 
     return 0;
 }
 
-static int create_filter(AVFilterGraph *ctx, int index, char *name,
-                         char *args)
-{
-    AVFilterContext *filt;
-
-    AVFilter *filterdef;
-    char tmp[20];
-
-    snprintf(tmp, 20, "%d", index);
-    if(!(filterdef = avfilter_get_by_name(name)) ||
-       !(filt = avfilter_open(filterdef, tmp))) {
-        av_log(&log_ctx, AV_LOG_ERROR,
-               "error creating filter '%s'\n", name);
-        return -1;
-    }
-    avfilter_graph_add_filter(ctx, filt);
-    if(avfilter_init_filter(filt, args, NULL)) {
-        av_log(&log_ctx, AV_LOG_ERROR,
-               "error initializing filter '%s'\n", name);
-        return -1;
-    }
-
-    return 0;
-}
-
-static int link_filter(AVFilterGraph *ctx, int src, int srcpad,
-                       int dst, int dstpad)
-{
-    AVFilterContext *filt, *filtb;
-
-    char tmp[20];
-
-    snprintf(tmp, 20, "%d", src);
-    if(!(filt = avfilter_graph_get_filter(ctx, tmp))) {
-        av_log(&log_ctx, AV_LOG_ERROR, "link source does not exist in graph\n");
-        return -1;
-    }
-    snprintf(tmp, 20, "%d", dst);
-    if(!(filtb = avfilter_graph_get_filter(ctx, tmp))) {
-        av_log(&log_ctx, AV_LOG_ERROR, "link destination does not exist in graph\n");
-        return -1;
-    }
-    if(avfilter_link(filt, srcpad, filtb, dstpad)) {
-        av_log(&log_ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
-        return -1;
-    }
-
-    return 0;
-}
-
-static int load_from_desc(AVFilterGraph *graph, AVFilterGraphDesc *desc, AVFilterContext *in, int inpad, AVFilterContext *out, int outpad)
-{
-    AVFilterGraphDescExport *curpad;
-    char tmp[20];
-    AVFilterContext *filt;
-    AVFilterGraphDescFilter *curfilt;
-    AVFilterGraphDescLink   *curlink;
-
-
-    /* create all filters */
-    for(curfilt = desc->filters; curfilt; curfilt = curfilt->next) {
-        if (create_filter(graph, curfilt->index, curfilt->filter,
-                          curfilt->args) < 0)
-            goto fail;
-    }
-
-    /* create all links */
-    for(curlink = desc->links; curlink; curlink = curlink->next) {
-        if (link_filter(graph, curlink->src, curlink->srcpad,
-                          curlink->dst, curlink->dstpad) < 0)
-            goto fail;
-    }
-
-    /* export all input pads */
-    for(curpad = desc->inputs; curpad; curpad = curpad->next) {
-        snprintf(tmp, 20, "%d", curpad->filter);
-        if(!(filt = avfilter_graph_get_filter(graph, tmp))) {
-            av_log(&log_ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
-            goto fail;
-        }
-        if(avfilter_link(in, inpad, filt, curpad->pad)) {
-            av_log(&log_ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
-            goto fail;
-        }
-    }
-
-    /* export all output pads */
-    for(curpad = desc->outputs; curpad; curpad = curpad->next) {
-        snprintf(tmp, 20, "%d", curpad->filter);
-        if(!(filt = avfilter_graph_get_filter(graph, tmp))) {
-            av_log(&log_ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
-            goto fail;
-        }
-
-        if(avfilter_link(filt, curpad->pad, out, outpad)) {
-            av_log(&log_ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
-            goto fail;
-        }
-    }
-
-    return 0;
-
-fail:
-    avfilter_destroy_graph(graph);
-    return -1;
-}
-
-
-static void consume_whitespace(const char **buf)
+int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 {
-    *buf += strspn(*buf, " \n\t");
-}
-
-/**
- * get the next non-whitespace char
- */
-static char consume_char(const char **buf)
-{
-    char out;
-    consume_whitespace(buf);
-
-    out = **buf;
-
-    if (out)
-        (*buf)++;
+    int ret;
 
-    return out;
-}
-
-/**
- * remove the quotation marks from a string. Ex: "aaa'bb'cc" -> "aaabbcc"
- */
-static void unquote(char *str)
-{
-    char *p1, *p2;
-    p1=p2=str;
-    while (*p1 != 0) {
-        if (*p1 != '\'')
-            *p2++ = *p1;
-        p1++;
-    }
-
-    *p2 = 0;
-}
-
-/**
- * Consumes a string from *buf.
- * @return a copy of the consumed string, which should be free'd after use
- */
-static char *consume_string(const char **buf)
-{
-    const char *start;
-    char *ret;
-    int size;
-
-    consume_whitespace(buf);
-
-    if (!(**buf))
-        return av_mallocz(1);
-
-    start = *buf;
-
-    *buf += strcspn(*buf, " ()=,'");
-
-    if (**buf == '\'') {
-        char *p = strchr(*buf + 1, '\'');
-        if (p)
-            *buf = p + 1;
-        else
-            *buf += strlen(*buf); // Move the pointer to the null end byte
-    }
-
-    size = *buf - start + 1;
-    ret = av_malloc(size);
-    memcpy(ret, start, size - 1);
-    ret[size-1] = 0;
-
-    unquote(ret);
-
-    return ret;
-}
-
-/**
- * Parse "(linkname)"
- * @arg name a pointer (that need to be free'd after use) to the name between
- *           parenthesis
- */
-static void parse_link_name(const char **buf, char **name)
-{
-    consume_char(buf);
-
-    *name = consume_string(buf);
-
-    if (!*name[0])
-        goto fail;
-
-    if (consume_char(buf) != ')')
-        goto fail;
-
-    return;
- fail:
-    av_freep(name);
-    av_log(&log_ctx, AV_LOG_ERROR, "Could not parse link name!\n");
-}
-
-/**
- * Parse "filter=params"
- * @arg name a pointer (that need to be free'd after use) to the name of the
- *           filter
- * @arg ars  a pointer (that need to be free'd after use) to the args of the
- *           filter
- */
-static void parse_filter(const char **buf, char **name, char **opts)
-{
-    *name = consume_string(buf);
-
-    if (**buf == '=') {
-        consume_char(buf);
-        *opts = consume_string(buf);
-    } else {
-        *opts = NULL;
-    }
-
-}
-
-enum LinkType {
-    LinkTypeIn,
-    LinkTypeOut,
-};
-
-/**
- * A linked-list of the inputs/outputs of the filter chain.
- */
-typedef struct AVFilterInOut {
-    enum LinkType type;
-    char *name;
-    int instance;
-    int pad_idx;
-
-    struct AVFilterInOut *next;
-} AVFilterInOut;
-
-static void free_inout(AVFilterInOut *head)
-{
-    while (head) {
-        AVFilterInOut *next;
-        next = head->next;
-        av_free(head);
-        head = next;
-    }
-}
-
-/**
- * Parse "(a1)(link2) ... (etc)"
- */
-static int parse_inouts(const char **buf, AVFilterInOut **inout, int firstpad,
-                        enum LinkType type, int instance)
-{
-    int pad = firstpad;
-    while (**buf == '(') {
-        AVFilterInOut *inoutn = av_malloc(sizeof(AVFilterInOut));
-        parse_link_name(buf, &inoutn->name);
-        inoutn->type = type;
-        inoutn->instance = instance;
-        inoutn->pad_idx = pad++;
-        inoutn->next = *inout;
-        *inout = inoutn;
-    }
-    return pad;
-}
-
-/**
- * Free a graph description.
- */
-static void free_desc(AVFilterGraphDesc *desc)
-{
-    void *next;
-
-    while(desc->filters) {
-        next = desc->filters->next;
-        av_free(desc->filters->filter);
-        av_free(desc->filters->args);
-        av_free(desc->filters);
-        desc->filters = next;
-    }
-
-    while(desc->links) {
-        next = desc->links->next;
-        av_free(desc->links);
-        desc->links = next;
-    }
-
-    while(desc->inputs) {
-        next = desc->inputs->next;
-        av_free(desc->inputs);
-        desc->inputs = next;
-    }
-
-    while(desc->outputs) {
-        next = desc->outputs->next;
-        av_free(desc->outputs);
-        desc->outputs = next;
-    }
-}
-
-static AVFilterGraphDesc *parse_chain(const char *filters, int has_in)
-{
-    AVFilterGraphDesc        *ret;
-    AVFilterGraphDescFilter **filterp, *filtern;
-    AVFilterGraphDescLink   **linkp,   *linkn;
-    AVFilterInOut           *inout=NULL;
-    AVFilterInOut           *head;
-
-    int index = 0;
-    char chr = 0;
-    int pad = 0;
-    int has_out = 0;
-
-    consume_whitespace(&filters);
-
-    if(!(ret = av_mallocz(sizeof(AVFilterGraphDesc))))
-        return NULL;
-
-    filterp = &ret->filters;
-    linkp   = &ret->links;
-
-    do {
-        if(chr == ',') {
-            linkn = av_mallocz(sizeof(AVFilterGraphDescLink));
-            linkn->src = index-1;
-            linkn->srcpad = pad;
-            linkn->dst = index;
-            linkn->dstpad = 0;
-
-            *linkp = linkn;
-            linkp = &linkn->next;
-        }
-        pad = parse_inouts(&filters, &inout, chr == ',' || (!has_in),
-                           LinkTypeIn, index);
-
-        filtern = av_mallocz(sizeof(AVFilterGraphDescFilter));
-        filtern->index = index;
-        parse_filter(&filters, &filtern->filter, &filtern->args);
-        *filterp = filtern;
-        filterp = &filtern->next;
-
-        pad = parse_inouts(&filters, &inout, 0,
-                           LinkTypeOut, index);
-        chr = consume_char(&filters);
-        index++;
-    } while (chr == ',' || chr == ';');
-
-    head = inout;
-    for (; inout != NULL; inout = inout->next) {
-        if (inout->instance == -1)
-            continue; // Already processed
-
-        if (!strcmp(inout->name, "in")) {
-            if (!has_in)
-                goto fail;
-            ret->inputs = av_mallocz(sizeof(AVFilterGraphDescExport));
-            ret->inputs->filter = inout->instance;
-            ret->inputs->pad = inout->pad_idx;
-        } else if (!strcmp(inout->name, "out")) {
-            has_out = 1;
-            ret->outputs = av_mallocz(sizeof(AVFilterGraphDescExport));
-            ret->outputs->filter = inout->instance;
-            ret->outputs->pad = inout->pad_idx;
-        } else {
-            AVFilterInOut *p, *src, *dst;
-            for (p = inout->next;
-                 p && strcmp(p->name,inout->name); p = p->next);
-
-            if (!p) {
-                av_log(&log_ctx, AV_LOG_ERROR, "Unmatched link: %s.\n",
-                       inout->name);
-                goto fail;
-            }
-
-            if (p->type == LinkTypeIn && inout->type == LinkTypeOut) {
-                src = inout;
-                dst = p;
-            } else if (p->type == LinkTypeOut && inout->type == LinkTypeIn) {
-                src = p;
-                dst = inout;
-            } else {
-                av_log(&log_ctx, AV_LOG_ERROR, "Two links named '%s' are either both input or both output\n",
-                       inout->name);
-                goto fail;
-            }
-            linkn = av_mallocz(sizeof(AVFilterGraphDescLink));
-
-            linkn->src = src->instance;
-            linkn->srcpad = src->pad_idx;
-            linkn->dst = dst->instance;
-            linkn->dstpad = dst->pad_idx;
-
-            *linkp = linkn;
-            linkp = &linkn->next;
-
-            src->instance = -1;
-            dst->instance = -1;
-        }
-    }
-
-    free_inout(head);
-
-    if (!has_in) {
-        ret->inputs = av_mallocz(sizeof(AVFilterGraphDescExport));
-        ret->inputs->filter = 0;
-    }
-    if (!has_out) {
-        ret->outputs = av_mallocz(sizeof(AVFilterGraphDescExport));
-        ret->outputs->filter = index-1;
-    }
-
-    return ret;
-
- fail:
-    free_inout(head);
-
-    free_desc(ret);
-    return NULL;
-}
-
-/**
- * Parse a string describing a filter graph.
- */
-int avfilter_graph_parse_chain(AVFilterGraph *graph, const char *filters, AVFilterContext *in, int inpad, AVFilterContext *out, int outpad)
-{
-    AVFilterGraphDesc *desc;
-
-    /* Try first to parse supposing there is no (in) element */
-    if (!(desc = parse_chain(filters, 0))) {
-        /* If it didn't work, parse supposing there is an (in) element */
-        desc = parse_chain(filters, 1);
-    }
-    if (!desc)
-        return -1;
-
-    if (load_from_desc(graph, desc, in, inpad, out, outpad) < 0) {
-        free_desc(desc);
-        return -1;
-    }
+    if ((ret = ff_avfilter_graph_check_validity(graphctx, log_ctx)))
+        return ret;
+    if ((ret = ff_avfilter_graph_config_formats(graphctx, log_ctx)))
+        return ret;
+    if ((ret = ff_avfilter_graph_config_links(graphctx, log_ctx)))
+        return ret;
 
-    free_desc(desc);
     return 0;
 }