X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavfilter%2Favfiltergraph.c;h=8c43251c4cc11ce32fc1ef3a41fe0961351513ec;hb=42de665db90f0f08e6f1215cd47cf27fd23e8e03;hp=d3c4ad9c09d0e2c06c6b664850d7fde5cf2e10ae;hpb=4160400d049a170c1647fa55b141dde7863cf28e;p=ffmpeg

diff --git a/libavfilter/avfiltergraph.c b/libavfilter/avfiltergraph.c
index d3c4ad9c09d..8c43251c4cc 100644
--- a/libavfilter/avfiltergraph.c
+++ b/libavfilter/avfiltergraph.c
@@ -1,189 +1,185 @@
 /*
  * filter graphs
- * 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
  */
 
+#include <ctype.h>
+#include <string.h>
+
 #include "avfilter.h"
 #include "avfiltergraph.h"
+#include "internal.h"
 
-typedef struct AVFilterGraph {
-    unsigned filter_count;
-    AVFilterContext **filters;
-
-    /** fake filters to handle links to internal filters */
-    AVFilterContext *link_filter_in;
-    AVFilterContext *link_filter_out;
-} GraphContext;
-
-typedef struct {
-    AVFilterContext *graph;
-} GraphLinkContext;
-
-static int link_init(AVFilterContext *ctx, const char *args, void *opaque)
+AVFilterGraph *avfilter_graph_alloc(void)
 {
-    GraphLinkContext *linkctx = ctx->priv;
-    linkctx->graph = opaque;
-    return !opaque;
+    return av_mallocz(sizeof(AVFilterGraph));
 }
 
-/**
- * Given the link between the dummy filter and an internal filter whose input
- * is being exported outside the graph, this returns the externally visible
- * link.
- */
-static inline AVFilterLink *get_extern_input_link(AVFilterLink *link)
+void avfilter_graph_free(AVFilterGraph **graph)
 {
-    GraphLinkContext *lctx = link->src->priv;
-    return lctx->graph->inputs[link->srcpad];
+    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);
 }
 
-/**
- * Given the link between the dummy filter and an internal filter whose output
- * is being exported outside the graph, this returns the externally visible
- * link.
- */
-static inline AVFilterLink *get_extern_output_link(AVFilterLink *link)
+int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
 {
-    GraphLinkContext *lctx = link->dst->priv;
-    return lctx->graph->outputs[link->dstpad];
-}
+    AVFilterContext **filters = av_realloc(graph->filters,
+                                           sizeof(AVFilterContext*) * (graph->filter_count+1));
+    if (!filters)
+        return AVERROR(ENOMEM);
 
+    graph->filters = filters;
+    graph->filters[graph->filter_count++] = filter;
 
-/** dummy filter used to help export filters pads outside the graph */
-static AVFilter vf_graph_dummy =
-{
-    .name      = "graph_dummy",
+    return 0;
+}
 
-    .priv_size = sizeof(GraphLinkContext),
+int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
+                                 const char *name, const char *args, void *opaque,
+                                 AVFilterGraph *graph_ctx)
+{
+    int ret;
 
-    .init      = link_init,
+    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;
 
-    .inputs    = (AVFilterPad[]) {{ .name = NULL, }},
-    .outputs   = (AVFilterPad[]) {{ .name = NULL, }},
-};
+fail:
+    if (*filt_ctx)
+        avfilter_free(*filt_ctx);
+    *filt_ctx = NULL;
+    return ret;
+}
 
-static void uninit(AVFilterContext *ctx)
+int ff_avfilter_graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
 {
-    GraphContext *graph = ctx->priv;
+    AVFilterContext *filt;
+    int i, j;
 
-    if(graph->link_filter_in) {
-        avfilter_destroy(graph->link_filter_in);
-        graph->link_filter_in = NULL;
-    }
-    if(graph->link_filter_out) {
-        avfilter_destroy(graph->link_filter_out);
-        graph->link_filter_out = NULL;
+    for (i = 0; i < graph->filter_count; i++) {
+        filt = graph->filters[i];
+
+        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);
+            }
+        }
     }
-    for(; graph->filter_count > 0; graph->filter_count --)
-        avfilter_destroy(graph->filters[graph->filter_count - 1]);
-    av_freep(&graph->filters);
+
+    return 0;
 }
 
-/* TODO: insert in sorted order */
-void avfilter_graph_add_filter(AVFilterContext *graphctx, AVFilterContext *filter)
+int ff_avfilter_graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
 {
-    GraphContext *graph = graphctx->priv;
+    AVFilterContext *filt;
+    int i, ret;
 
-    graph->filters = av_realloc(graph->filters,
-                                sizeof(AVFilterContext*) * ++graph->filter_count);
-    graph->filters[graph->filter_count - 1] = filter;
+    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(AVFilterContext *ctx, char *name)
+AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
 {
-    GraphContext *graph = ctx->priv;
     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(AVFilterContext *graphctx)
+static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
 {
-    GraphContext *graph = graphctx->priv;
-    AVFilterContext *linkfiltin  = graph->link_filter_in;
-    AVFilterContext *linkfiltout = graph->link_filter_out;
-    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]);
     }
 
-    /* use these formats on our exported links */
-    for(i = 0; i < linkfiltout->input_count; i ++) {
-        avfilter_formats_ref( linkfiltout->inputs[i]->in_formats,
-                             &linkfiltout->inputs[i]->out_formats);
-
-        if(graphctx->outputs[i])
-            avfilter_formats_ref(linkfiltout->inputs[i]->in_formats,
-                                 &graphctx->outputs[i]->in_formats);
-    }
-    for(i = 0; i < linkfiltin->output_count; i ++) {
-        avfilter_formats_ref( linkfiltin->outputs[i]->out_formats,
-                             &linkfiltin->outputs[i]->in_formats);
-
-        if(graphctx->inputs[i])
-            avfilter_formats_ref(linkfiltin->outputs[i]->out_formats,
-                                 &graphctx-> inputs[i]->out_formats);
-    }
-
     /* 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(graphctx, 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);
+                    }
                 }
             }
         }
@@ -194,7 +190,7 @@ static int query_formats(AVFilterContext *graphctx)
 
 static void pick_format(AVFilterLink *link)
 {
-    if(!link || !link->in_formats)
+    if (!link || !link->in_formats)
         return;
 
     link->in_formats->format_count = 1;
@@ -204,166 +200,45 @@ static void pick_format(AVFilterLink *link)
     avfilter_formats_unref(&link->out_formats);
 }
 
-static void pick_formats(GraphContext *graph)
+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];
 
-        if(filter->filter == &avfilter_vf_graph)
-            pick_formats(filter->priv);
-
-        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(AVFilterContext *graphctx)
+int ff_avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
 {
-    GraphContext *graph = graphctx->priv;
+    int ret;
 
     /* find supported formats from sub-filters, and merge along links */
-    if(query_formats(graphctx))
-        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 graph_load_from_desc2(AVFilterContext *ctx, AVFilterGraphDesc *desc)
+int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 {
-    AVFilterGraphDescFilter *curfilt;
-    AVFilterGraphDescLink   *curlink;
-    AVFilterContext *filt, *filtb;
-
-    AVFilter *filterdef;
-    char tmp[20];
-
-    /* create all filters */
-    for(curfilt = desc->filters; curfilt; curfilt = curfilt->next) {
-        snprintf(tmp, 20, "%d", curfilt->index);
-        if(!(filterdef = avfilter_get_by_name(curfilt->filter)) ||
-           !(filt = avfilter_open(filterdef, tmp))) {
-            av_log(ctx, AV_LOG_ERROR,
-               "error creating filter '%s'\n", curfilt->filter);
-            goto fail;
-        }
-        avfilter_graph_add_filter(ctx, filt);
-        if(avfilter_init_filter(filt, curfilt->args, NULL)) {
-            av_log(ctx, AV_LOG_ERROR,
-                "error initializing filter '%s'\n", curfilt->filter);
-            goto fail;
-        }
-    }
+    int ret;
 
-    /* create all links */
-    for(curlink = desc->links; curlink; curlink = curlink->next) {
-        snprintf(tmp, 20, "%d", curlink->src);
-        if(!(filt = avfilter_graph_get_filter(ctx, tmp))) {
-            av_log(ctx, AV_LOG_ERROR, "link source does not exist in graph\n");
-            goto fail;
-        }
-        snprintf(tmp, 20, "%d", curlink->dst);
-        if(!(filtb = avfilter_graph_get_filter(ctx, tmp))) {
-            av_log(ctx, AV_LOG_ERROR, "link destination does not exist in graph\n");
-            goto fail;
-        }
-        if(avfilter_link(filt, curlink->srcpad, filtb, curlink->dstpad)) {
-            av_log(ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
-            goto fail;
-        }
-    }
+    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;
 
     return 0;
-
-fail:
-    uninit(ctx);
-    return -1;
 }
-
-int graph_load_from_desc3(AVFilterContext *ctx, AVFilterGraphDesc *desc, AVFilterContext *in, int inpad, AVFilterContext *out, int outpad)
-{
-    AVFilterGraphDescExport *curpad;
-    char tmp[20];
-    AVFilterContext *filt;
-
-    if (graph_load_from_desc2(ctx, desc) < 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(ctx, tmp))) {
-            av_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(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(ctx, tmp))) {
-            av_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(ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
-            goto fail;
-        }
-    }
-
-    return 0;
-
-fail:
-    uninit(ctx);
-    return -1;
-}
-
-static int init(AVFilterContext *ctx, const char *args, void *opaque)
-{
-    GraphContext *gctx = ctx->priv;
-
-    if(!(gctx->link_filter_in = avfilter_open(&vf_graph_dummy, NULL)))
-        return -1;
-    if(avfilter_init_filter(gctx->link_filter_in, NULL, ctx))
-        goto fail;
-    if(!(gctx->link_filter_out = avfilter_open(&vf_graph_dummy, NULL)))
-        goto fail;
-    if(avfilter_init_filter(gctx->link_filter_out, NULL, ctx))
-        goto fail;
-
-    return 0;
-
-fail:
-    avfilter_destroy(gctx->link_filter_in);
-    if(gctx->link_filter_out)
-        avfilter_destroy(gctx->link_filter_out);
-    return -1;
-}
-
-AVFilter avfilter_vf_graph =
-{
-    .name      = "graph",
-
-    .priv_size = sizeof(GraphContext),
-
-    .init      = init,
-    .uninit    = uninit,
-
-    .query_formats = query_formats,
-
-    .inputs    = (AVFilterPad[]) {{ .name = NULL, }},
-    .outputs   = (AVFilterPad[]) {{ .name = NULL, }},
-};
-