chasing indexing error

1 files changed, 0 insertions, 1326 deletions

diff --git a/ffmpeg/libavfilter/avfiltergraph.c b/ffmpeg/libavfilter/avfiltergraph.c
deleted file mode 100644
index 1fb83c4..0000000
--- a/ffmpeg/libavfilter/avfiltergraph.c
+++ /dev/null
@@ -1,1326 +0,0 @@
-/*
- * filter graphs
- * Copyright (c) 2008 Vitor Sessak
- * Copyright (c) 2007 Bobby Bingham
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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,
- * 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
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "config.h"
-
-#include <string.h>
-
-#include "libavutil/avassert.h"
-#include "libavutil/avstring.h"
-#include "libavutil/bprint.h"
-#include "libavutil/channel_layout.h"
-#include "libavutil/internal.h"
-#include "libavutil/opt.h"
-#include "libavutil/pixdesc.h"
-#include "libavcodec/avcodec.h" // avcodec_find_best_pix_fmt_of_2()
-
-#include "avfilter.h"
-#include "formats.h"
-#include "internal.h"
-#include "thread.h"
-
-#define OFFSET(x) offsetof(AVFilterGraph, x)
-#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
-static const AVOption filtergraph_options[] = {
-    { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
-        { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
-        { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags = FLAGS, .unit = "thread_type" },
-    { "threads",     "Maximum number of threads", OFFSET(nb_threads),
-        AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, FLAGS },
-    {"scale_sws_opts"       , "default scale filter options"        , OFFSET(scale_sws_opts)        ,
-        AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
-    {"aresample_swr_opts"   , "default aresample filter options"    , OFFSET(aresample_swr_opts)    ,
-        AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
-    { NULL },
-};
-
-static const AVClass filtergraph_class = {
-    .class_name = "AVFilterGraph",
-    .item_name  = av_default_item_name,
-    .version    = LIBAVUTIL_VERSION_INT,
-    .option     = filtergraph_options,
-    .category   = AV_CLASS_CATEGORY_FILTER,
-};
-
-#if !HAVE_THREADS
-void ff_graph_thread_free(AVFilterGraph *graph)
-{
-}
-
-int ff_graph_thread_init(AVFilterGraph *graph)
-{
-    graph->thread_type = 0;
-    graph->nb_threads  = 1;
-    return 0;
-}
-#endif
-
-AVFilterGraph *avfilter_graph_alloc(void)
-{
-    AVFilterGraph *ret = av_mallocz(sizeof(*ret));
-    if (!ret)
-        return NULL;
-
-    ret->internal = av_mallocz(sizeof(*ret->internal));
-    if (!ret->internal) {
-        av_freep(&ret);
-        return NULL;
-    }
-
-    ret->av_class = &filtergraph_class;
-    av_opt_set_defaults(ret);
-
-    return ret;
-}
-
-void ff_filter_graph_remove_filter(AVFilterGraph *graph, AVFilterContext *filter)
-{
-    int i;
-    for (i = 0; i < graph->nb_filters; i++) {
-        if (graph->filters[i] == filter) {
-            FFSWAP(AVFilterContext*, graph->filters[i],
-                   graph->filters[graph->nb_filters - 1]);
-            graph->nb_filters--;
-            return;
-        }
-    }
-}
-
-void avfilter_graph_free(AVFilterGraph **graph)
-{
-    if (!*graph)
-        return;
-
-    while ((*graph)->nb_filters)
-        avfilter_free((*graph)->filters[0]);
-
-    ff_graph_thread_free(*graph);
-
-    av_freep(&(*graph)->sink_links);
-
-    av_freep(&(*graph)->scale_sws_opts);
-    av_freep(&(*graph)->aresample_swr_opts);
-    av_freep(&(*graph)->resample_lavr_opts);
-    av_freep(&(*graph)->filters);
-    av_freep(&(*graph)->internal);
-    av_freep(graph);
-}
-
-#if FF_API_AVFILTER_OPEN
-int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
-{
-    AVFilterContext **filters = av_realloc(graph->filters,
-                                           sizeof(*filters) * (graph->nb_filters + 1));
-    if (!filters)
-        return AVERROR(ENOMEM);
-
-    graph->filters = filters;
-    graph->filters[graph->nb_filters++] = filter;
-
-#if FF_API_FOO_COUNT
-FF_DISABLE_DEPRECATION_WARNINGS
-    graph->filter_count_unused = graph->nb_filters;
-FF_ENABLE_DEPRECATION_WARNINGS
-#endif
-
-    filter->graph = graph;
-
-    return 0;
-}
-#endif
-
-int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt,
-                                 const char *name, const char *args, void *opaque,
-                                 AVFilterGraph *graph_ctx)
-{
-    int ret;
-
-    *filt_ctx = avfilter_graph_alloc_filter(graph_ctx, filt, name);
-    if (!*filt_ctx)
-        return AVERROR(ENOMEM);
-
-    ret = avfilter_init_str(*filt_ctx, args);
-    if (ret < 0)
-        goto fail;
-
-    return 0;
-
-fail:
-    if (*filt_ctx)
-        avfilter_free(*filt_ctx);
-    *filt_ctx = NULL;
-    return ret;
-}
-
-void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
-{
-    graph->disable_auto_convert = flags;
-}
-
-AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
-                                             const AVFilter *filter,
-                                             const char *name)
-{
-    AVFilterContext **filters, *s;
-
-    if (graph->thread_type && !graph->internal->thread_execute) {
-        if (graph->execute) {
-            graph->internal->thread_execute = graph->execute;
-        } else {
-            int ret = ff_graph_thread_init(graph);
-            if (ret < 0) {
-                av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
-                return NULL;
-            }
-        }
-    }
-
-    s = ff_filter_alloc(filter, name);
-    if (!s)
-        return NULL;
-
-    filters = av_realloc(graph->filters, sizeof(*filters) * (graph->nb_filters + 1));
-    if (!filters) {
-        avfilter_free(s);
-        return NULL;
-    }
-
-    graph->filters = filters;
-    graph->filters[graph->nb_filters++] = s;
-
-#if FF_API_FOO_COUNT
-FF_DISABLE_DEPRECATION_WARNINGS
-    graph->filter_count_unused = graph->nb_filters;
-FF_ENABLE_DEPRECATION_WARNINGS
-#endif
-
-    s->graph = graph;
-
-    return s;
-}
-
-/**
- * Check for the validity of graph.
- *
- * A graph is considered valid if all its input and output pads are
- * connected.
- *
- * @return >= 0 in case of success, a negative value otherwise
- */
-static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
-{
-    AVFilterContext *filt;
-    int i, j;
-
-    for (i = 0; i < graph->nb_filters; i++) {
-        const AVFilterPad *pad;
-        filt = graph->filters[i];
-
-        for (j = 0; j < filt->nb_inputs; j++) {
-            if (!filt->inputs[j] || !filt->inputs[j]->src) {
-                pad = &filt->input_pads[j];
-                av_log(log_ctx, AV_LOG_ERROR,
-                       "Input pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any source\n",
-                       pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
-                return AVERROR(EINVAL);
-            }
-        }
-
-        for (j = 0; j < filt->nb_outputs; j++) {
-            if (!filt->outputs[j] || !filt->outputs[j]->dst) {
-                pad = &filt->output_pads[j];
-                av_log(log_ctx, AV_LOG_ERROR,
-                       "Output pad \"%s\" with type %s of the filter instance \"%s\" of %s not connected to any destination\n",
-                       pad->name, av_get_media_type_string(pad->type), filt->name, filt->filter->name);
-                return AVERROR(EINVAL);
-            }
-        }
-    }
-
-    return 0;
-}
-
-/**
- * Configure all the links of graphctx.
- *
- * @return >= 0 in case of success, a negative value otherwise
- */
-static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
-{
-    AVFilterContext *filt;
-    int i, ret;
-
-    for (i = 0; i < graph->nb_filters; i++) {
-        filt = graph->filters[i];
-
-        if (!filt->nb_outputs) {
-            if ((ret = avfilter_config_links(filt)))
-                return ret;
-        }
-    }
-
-    return 0;
-}
-
-AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
-{
-    int i;
-
-    for (i = 0; i < graph->nb_filters; i++)
-        if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
-            return graph->filters[i];
-
-    return NULL;
-}
-
-static void sanitize_channel_layouts(void *log, AVFilterChannelLayouts *l)
-{
-    if (!l)
-        return;
-    if (l->nb_channel_layouts) {
-        if (l->all_layouts || l->all_counts)
-            av_log(log, AV_LOG_WARNING, "All layouts set on non-empty list\n");
-        l->all_layouts = l->all_counts = 0;
-    } else {
-        if (l->all_counts && !l->all_layouts)
-            av_log(log, AV_LOG_WARNING, "All counts without all layouts\n");
-        l->all_layouts = 1;
-    }
-}
-
-static int filter_query_formats(AVFilterContext *ctx)
-{
-    int ret, i;
-    AVFilterFormats *formats;
-    AVFilterChannelLayouts *chlayouts;
-    AVFilterFormats *samplerates;
-    enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
-                            ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
-                            AVMEDIA_TYPE_VIDEO;
-
-    if ((ret = ctx->filter->query_formats(ctx)) < 0) {
-        if (ret != AVERROR(EAGAIN))
-            av_log(ctx, AV_LOG_ERROR, "Query format failed for '%s': %s\n",
-                   ctx->name, av_err2str(ret));
-        return ret;
-    }
-
-    for (i = 0; i < ctx->nb_inputs; i++)
-        sanitize_channel_layouts(ctx, ctx->inputs[i]->out_channel_layouts);
-    for (i = 0; i < ctx->nb_outputs; i++)
-        sanitize_channel_layouts(ctx, ctx->outputs[i]->in_channel_layouts);
-
-    formats = ff_all_formats(type);
-    if (!formats)
-        return AVERROR(ENOMEM);
-    ff_set_common_formats(ctx, formats);
-    if (type == AVMEDIA_TYPE_AUDIO) {
-        samplerates = ff_all_samplerates();
-        if (!samplerates)
-            return AVERROR(ENOMEM);
-        ff_set_common_samplerates(ctx, samplerates);
-        chlayouts = ff_all_channel_layouts();
-        if (!chlayouts)
-            return AVERROR(ENOMEM);
-        ff_set_common_channel_layouts(ctx, chlayouts);
-    }
-    return 0;
-}
-
-static int formats_declared(AVFilterContext *f)
-{
-    int i;
-
-    for (i = 0; i < f->nb_inputs; i++) {
-        if (!f->inputs[i]->out_formats)
-            return 0;
-        if (f->inputs[i]->type == AVMEDIA_TYPE_AUDIO &&
-            !(f->inputs[i]->out_samplerates &&
-              f->inputs[i]->out_channel_layouts))
-            return 0;
-    }
-    for (i = 0; i < f->nb_outputs; i++) {
-        if (!f->outputs[i]->in_formats)
-            return 0;
-        if (f->outputs[i]->type == AVMEDIA_TYPE_AUDIO &&
-            !(f->outputs[i]->in_samplerates &&
-              f->outputs[i]->in_channel_layouts))
-            return 0;
-    }
-    return 1;
-}
-
-static AVFilterFormats *clone_filter_formats(AVFilterFormats *arg)
-{
-    AVFilterFormats *a = av_memdup(arg, sizeof(*arg));
-    if (a) {
-        a->refcount = 0;
-        a->refs     = NULL;
-        a->formats  = av_memdup(a->formats, sizeof(*a->formats) * a->nb_formats);
-        if (!a->formats && arg->formats)
-            av_freep(&a);
-    }
-    return a;
-}
-
-static int can_merge_formats(AVFilterFormats *a_arg,
-                             AVFilterFormats *b_arg,
-                             enum AVMediaType type,
-                             int is_sample_rate)
-{
-    AVFilterFormats *a, *b, *ret;
-    if (a_arg == b_arg)
-        return 1;
-    a = clone_filter_formats(a_arg);
-    b = clone_filter_formats(b_arg);
-
-    if (!a || !b) {
-        if (a)
-            av_freep(&a->formats);
-        if (b)
-            av_freep(&b->formats);
-
-        av_freep(&a);
-        av_freep(&b);
-
-        return 0;
-    }
-
-    if (is_sample_rate) {
-        ret = ff_merge_samplerates(a, b);
-    } else {
-        ret = ff_merge_formats(a, b, type);
-    }
-    if (ret) {
-        av_freep(&ret->formats);
-        av_freep(&ret->refs);
-        av_freep(&ret);
-        return 1;
-    } else {
-        av_freep(&a->formats);
-        av_freep(&b->formats);
-        av_freep(&a);
-        av_freep(&b);
-        return 0;
-    }
-}
-
-/**
- * Perform one round of query_formats() and merging formats lists on the
- * filter graph.
- * @return  >=0 if all links formats lists could be queried and merged;
- *          AVERROR(EAGAIN) some progress was made in the queries or merging
- *          and a later call may succeed;
- *          AVERROR(EIO) (may be changed) plus a log message if no progress
- *          was made and the negotiation is stuck;
- *          a negative error code if some other error happened
- */
-static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
-{
-    int i, j, ret;
-    int scaler_count = 0, resampler_count = 0;
-    int count_queried = 0;        /* successful calls to query_formats() */
-    int count_merged = 0;         /* successful merge of formats lists */
-    int count_already_merged = 0; /* lists already merged */
-    int count_delayed = 0;        /* lists that need to be merged later */
-
-    for (i = 0; i < graph->nb_filters; i++) {
-        AVFilterContext *f = graph->filters[i];
-        if (formats_declared(f))
-            continue;
-        if (f->filter->query_formats)
-            ret = filter_query_formats(f);
-        else
-            ret = ff_default_query_formats(f);
-        if (ret < 0 && ret != AVERROR(EAGAIN))
-            return ret;
-        /* note: EAGAIN could indicate a partial success, not counted yet */
-        count_queried += ret >= 0;
-    }
-
-    /* go through and merge as many format lists as possible */
-    for (i = 0; i < graph->nb_filters; i++) {
-        AVFilterContext *filter = graph->filters[i];
-
-        for (j = 0; j < filter->nb_inputs; j++) {
-            AVFilterLink *link = filter->inputs[j];
-            int convert_needed = 0;
-
-            if (!link)
-                continue;
-
-            if (link->in_formats != link->out_formats
-                && link->in_formats && link->out_formats)
-                if (!can_merge_formats(link->in_formats, link->out_formats,
-                                      link->type, 0))
-                    convert_needed = 1;
-            if (link->type == AVMEDIA_TYPE_AUDIO) {
-                if (link->in_samplerates != link->out_samplerates
-                    && link->in_samplerates && link->out_samplerates)
-                    if (!can_merge_formats(link->in_samplerates,
-                                           link->out_samplerates,
-                                           0, 1))
-                        convert_needed = 1;
-            }
-
-#define MERGE_DISPATCH(field, statement)                                     \
-            if (!(link->in_ ## field && link->out_ ## field)) {              \
-                count_delayed++;                                             \
-            } else if (link->in_ ## field == link->out_ ## field) {          \
-                count_already_merged++;                                      \
-            } else if (!convert_needed) {                                    \
-                count_merged++;                                              \
-                statement                                                    \
-            }
-
-            if (link->type == AVMEDIA_TYPE_AUDIO) {
-                MERGE_DISPATCH(channel_layouts,
-                    if (!ff_merge_channel_layouts(link->in_channel_layouts,
-                                                  link->out_channel_layouts))
-                        convert_needed = 1;
-                )
-                MERGE_DISPATCH(samplerates,
-                    if (!ff_merge_samplerates(link->in_samplerates,
-                                              link->out_samplerates))
-                        convert_needed = 1;
-                )
-            }
-            MERGE_DISPATCH(formats,
-                if (!ff_merge_formats(link->in_formats, link->out_formats,
-                                      link->type))
-                    convert_needed = 1;
-            )
-#undef MERGE_DISPATCH
-
-            if (convert_needed) {
-                AVFilterContext *convert;
-                AVFilter *filter;
-                AVFilterLink *inlink, *outlink;
-                char scale_args[256];
-                char inst_name[30];
-
-                /* couldn't merge format lists. auto-insert conversion filter */
-                switch (link->type) {
-                case AVMEDIA_TYPE_VIDEO:
-                    if (!(filter = avfilter_get_by_name("scale"))) {
-                        av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
-                               "not present, cannot convert pixel formats.\n");
-                        return AVERROR(EINVAL);
-                    }
-
-                    snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
-                             scaler_count++);
-
-                    if ((ret = avfilter_graph_create_filter(&convert, filter,
-                                                            inst_name, graph->scale_sws_opts, NULL,
-                                                            graph)) < 0)
-                        return ret;
-                    break;
-                case AVMEDIA_TYPE_AUDIO:
-                    if (!(filter = avfilter_get_by_name("aresample"))) {
-                        av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
-                               "not present, cannot convert audio formats.\n");
-                        return AVERROR(EINVAL);
-                    }
-
-                    snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
-                             resampler_count++);
-                    scale_args[0] = '\0';
-                    if (graph->aresample_swr_opts)
-                        snprintf(scale_args, sizeof(scale_args), "%s",
-                                 graph->aresample_swr_opts);
-                    if ((ret = avfilter_graph_create_filter(&convert, filter,
-                                                            inst_name, graph->aresample_swr_opts,
-                                                            NULL, graph)) < 0)
-                        return ret;
-                    break;
-                default:
-                    return AVERROR(EINVAL);
-                }
-
-                if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
-                    return ret;
-
-                filter_query_formats(convert);
-                inlink  = convert->inputs[0];
-                outlink = convert->outputs[0];
-                if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats,  inlink->type) ||
-                    !ff_merge_formats(outlink->in_formats, outlink->out_formats, outlink->type))
-                    ret |= AVERROR(ENOSYS);
-                if (inlink->type == AVMEDIA_TYPE_AUDIO &&
-                    (!ff_merge_samplerates(inlink->in_samplerates,
-                                           inlink->out_samplerates) ||
-                     !ff_merge_channel_layouts(inlink->in_channel_layouts,
-                                               inlink->out_channel_layouts)))
-                    ret |= AVERROR(ENOSYS);
-                if (outlink->type == AVMEDIA_TYPE_AUDIO &&
-                    (!ff_merge_samplerates(outlink->in_samplerates,
-                                           outlink->out_samplerates) ||
-                     !ff_merge_channel_layouts(outlink->in_channel_layouts,
-                                               outlink->out_channel_layouts)))
-                    ret |= AVERROR(ENOSYS);
-
-                if (ret < 0) {
-                    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 ret;
-                }
-            }
-        }
-    }
-
-    av_log(graph, AV_LOG_DEBUG, "query_formats: "
-           "%d queried, %d merged, %d already done, %d delayed\n",
-           count_queried, count_merged, count_already_merged, count_delayed);
-    if (count_delayed) {
-        AVBPrint bp;
-
-        /* if count_queried > 0, one filter at least did set its formats,
-           that will give additional information to its neighbour;
-           if count_merged > 0, one pair of formats lists at least was merged,
-           that will give additional information to all connected filters;
-           in both cases, progress was made and a new round must be done */
-        if (count_queried || count_merged)
-            return AVERROR(EAGAIN);
-        av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
-        for (i = 0; i < graph->nb_filters; i++)
-            if (!formats_declared(graph->filters[i]))
-                av_bprintf(&bp, "%s%s", bp.len ? ", " : "",
-                          graph->filters[i]->name);
-        av_log(graph, AV_LOG_ERROR,
-               "The following filters could not choose their formats: %s\n"
-               "Consider inserting the (a)format filter near their input or "
-               "output.\n", bp.str);
-        return AVERROR(EIO);
-    }
-    return 0;
-}
-
-static int pick_format(AVFilterLink *link, AVFilterLink *ref)
-{
-    if (!link || !link->in_formats)
-        return 0;
-
-    if (link->type == AVMEDIA_TYPE_VIDEO) {
-        if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
-            int has_alpha= av_pix_fmt_desc_get(ref->format)->nb_components % 2 == 0;
-            enum AVPixelFormat best= AV_PIX_FMT_NONE;
-            int i;
-            for (i=0; i<link->in_formats->nb_formats; i++) {
-                enum AVPixelFormat p = link->in_formats->formats[i];
-                best= avcodec_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
-            }
-            av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
-                   av_get_pix_fmt_name(best), link->in_formats->nb_formats,
-                   av_get_pix_fmt_name(ref->format), has_alpha);
-            link->in_formats->formats[0] = best;
-        }
-    }
-
-    link->in_formats->nb_formats = 1;
-    link->format = link->in_formats->formats[0];
-
-    if (link->type == AVMEDIA_TYPE_AUDIO) {
-        if (!link->in_samplerates->nb_formats) {
-            av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
-                   " the link between filters %s and %s.\n", link->src->name,
-                   link->dst->name);
-            return AVERROR(EINVAL);
-        }
-        link->in_samplerates->nb_formats = 1;
-        link->sample_rate = link->in_samplerates->formats[0];
-
-        if (link->in_channel_layouts->all_layouts) {
-            av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
-                   " the link between filters %s and %s.\n", link->src->name,
-                   link->dst->name);
-            if (!link->in_channel_layouts->all_counts)
-                av_log(link->src, AV_LOG_ERROR, "Unknown channel layouts not "
-                       "supported, try specifying a channel layout using "
-                       "'aformat=channel_layouts=something'.\n");
-            return AVERROR(EINVAL);
-        }
-        link->in_channel_layouts->nb_channel_layouts = 1;
-        link->channel_layout = link->in_channel_layouts->channel_layouts[0];
-        if ((link->channels = FF_LAYOUT2COUNT(link->channel_layout)))
-            link->channel_layout = 0;
-        else
-            link->channels = av_get_channel_layout_nb_channels(link->channel_layout);
-    }
-
-    ff_formats_unref(&link->in_formats);
-    ff_formats_unref(&link->out_formats);
-    ff_formats_unref(&link->in_samplerates);
-    ff_formats_unref(&link->out_samplerates);
-    ff_channel_layouts_unref(&link->in_channel_layouts);
-    ff_channel_layouts_unref(&link->out_channel_layouts);
-
-    return 0;
-}
-
-#define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
-do {                                                                   \
-    for (i = 0; i < filter->nb_inputs; i++) {                          \
-        AVFilterLink *link = filter->inputs[i];                        \
-        fmt_type fmt;                                                  \
-                                                                       \
-        if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
-            continue;                                                  \
-        fmt = link->out_ ## list->var[0];                              \
-                                                                       \
-        for (j = 0; j < filter->nb_outputs; j++) {                     \
-            AVFilterLink *out_link = filter->outputs[j];               \
-            list_type *fmts;                                           \
-                                                                       \
-            if (link->type != out_link->type ||                        \
-                out_link->in_ ## list->nb == 1)                        \
-                continue;                                              \
-            fmts = out_link->in_ ## list;                              \
-                                                                       \
-            if (!out_link->in_ ## list->nb) {                          \
-                add_format(&out_link->in_ ##list, fmt);                \
-                ret = 1;                                               \
-                break;                                                 \
-            }                                                          \
-                                                                       \
-            for (k = 0; k < out_link->in_ ## list->nb; k++)            \
-                if (fmts->var[k] == fmt) {                             \
-                    fmts->var[0]  = fmt;                               \
-                    fmts->nb = 1;                                      \
-                    ret = 1;                                           \
-                    break;                                             \
-                }                                                      \
-        }                                                              \
-    }                                                                  \
-} while (0)
-
-static int reduce_formats_on_filter(AVFilterContext *filter)
-{
-    int i, j, k, ret = 0;
-
-    REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
-                   nb_formats, ff_add_format);
-    REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
-                   nb_formats, ff_add_format);
-
-    /* reduce channel layouts */
-    for (i = 0; i < filter->nb_inputs; i++) {
-        AVFilterLink *inlink = filter->inputs[i];
-        uint64_t fmt;
-
-        if (!inlink->out_channel_layouts ||
-            inlink->out_channel_layouts->nb_channel_layouts != 1)
-            continue;
-        fmt = inlink->out_channel_layouts->channel_layouts[0];
-
-        for (j = 0; j < filter->nb_outputs; j++) {
-            AVFilterLink *outlink = filter->outputs[j];
-            AVFilterChannelLayouts *fmts;
-
-            fmts = outlink->in_channel_layouts;
-            if (inlink->type != outlink->type || fmts->nb_channel_layouts == 1)
-                continue;
-
-            if (fmts->all_layouts &&
-                (!FF_LAYOUT2COUNT(fmt) || fmts->all_counts)) {
-                /* Turn the infinite list into a singleton */
-                fmts->all_layouts = fmts->all_counts  = 0;
-                ff_add_channel_layout(&outlink->in_channel_layouts, fmt);
-                break;
-            }
-
-            for (k = 0; k < outlink->in_channel_layouts->nb_channel_layouts; k++) {
-                if (fmts->channel_layouts[k] == fmt) {
-                    fmts->channel_layouts[0]  = fmt;
-                    fmts->nb_channel_layouts = 1;
-                    ret = 1;
-                    break;
-                }
-            }
-        }
-    }
-
-    return ret;
-}
-
-static void reduce_formats(AVFilterGraph *graph)
-{
-    int i, reduced;
-
-    do {
-        reduced = 0;
-
-        for (i = 0; i < graph->nb_filters; i++)
-            reduced |= reduce_formats_on_filter(graph->filters[i]);
-    } while (reduced);
-}
-
-static void swap_samplerates_on_filter(AVFilterContext *filter)
-{
-    AVFilterLink *link = NULL;
-    int sample_rate;
-    int i, j;
-
-    for (i = 0; i < filter->nb_inputs; i++) {
-        link = filter->inputs[i];
-
-        if (link->type == AVMEDIA_TYPE_AUDIO &&
-            link->out_samplerates->nb_formats== 1)
-            break;
-    }
-    if (i == filter->nb_inputs)
-        return;
-
-    sample_rate = link->out_samplerates->formats[0];
-
-    for (i = 0; i < filter->nb_outputs; i++) {
-        AVFilterLink *outlink = filter->outputs[i];
-        int best_idx, best_diff = INT_MAX;
-
-        if (outlink->type != AVMEDIA_TYPE_AUDIO ||
-            outlink->in_samplerates->nb_formats < 2)
-            continue;
-
-        for (j = 0; j < outlink->in_samplerates->nb_formats; j++) {
-            int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
-
-            if (diff < best_diff) {
-                best_diff = diff;
-                best_idx  = j;
-            }
-        }
-        FFSWAP(int, outlink->in_samplerates->formats[0],
-               outlink->in_samplerates->formats[best_idx]);
-    }
-}
-
-static void swap_samplerates(AVFilterGraph *graph)
-{
-    int i;
-
-    for (i = 0; i < graph->nb_filters; i++)
-        swap_samplerates_on_filter(graph->filters[i]);
-}
-
-#define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
-#define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
-#define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
-#define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
-#define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
-#define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
-#define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
-
-/* allowable substitutions for channel pairs when comparing layouts,
- * ordered by priority for both values */
-static const uint64_t ch_subst[][2] = {
-    { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
-    { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
-    { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
-    { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
-    { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
-    { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
-    { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
-    { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
-    { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
-    { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
-    { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
-    { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
-    { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
-    { CH_SIDE_PAIR,       CH_BACK_PAIR       },
-    { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
-    { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
-    { CH_BACK_PAIR,       CH_SIDE_PAIR       },
-    { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
-    { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
-    { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
-    { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
-};
-
-static void swap_channel_layouts_on_filter(AVFilterContext *filter)
-{
-    AVFilterLink *link = NULL;
-    int i, j, k;
-
-    for (i = 0; i < filter->nb_inputs; i++) {
-        link = filter->inputs[i];
-
-        if (link->type == AVMEDIA_TYPE_AUDIO &&
-            link->out_channel_layouts->nb_channel_layouts == 1)
-            break;
-    }
-    if (i == filter->nb_inputs)
-        return;
-
-    for (i = 0; i < filter->nb_outputs; i++) {
-        AVFilterLink *outlink = filter->outputs[i];
-        int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
-
-        if (outlink->type != AVMEDIA_TYPE_AUDIO ||
-            outlink->in_channel_layouts->nb_channel_layouts < 2)
-            continue;
-
-        for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
-            uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
-            uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
-            int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
-            int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
-            int count_diff        = out_channels - in_channels;
-            int matched_channels, extra_channels;
-            int score = 100000;
-
-            if (FF_LAYOUT2COUNT(in_chlayout) || FF_LAYOUT2COUNT(out_chlayout)) {
-                /* Compute score in case the input or output layout encodes
-                   a channel count; in this case the score is not altered by
-                   the computation afterwards, as in_chlayout and
-                   out_chlayout have both been set to 0 */
-                if (FF_LAYOUT2COUNT(in_chlayout))
-                    in_channels = FF_LAYOUT2COUNT(in_chlayout);
-                if (FF_LAYOUT2COUNT(out_chlayout))
-                    out_channels = FF_LAYOUT2COUNT(out_chlayout);
-                score -= 10000 + FFABS(out_channels - in_channels) +
-                         (in_channels > out_channels ? 10000 : 0);
-                in_chlayout = out_chlayout = 0;
-                /* Let the remaining computation run, even if the score
-                   value is not altered */
-            }
-
-            /* channel substitution */
-            for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
-                uint64_t cmp0 = ch_subst[k][0];
-                uint64_t cmp1 = ch_subst[k][1];
-                if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
-                    (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
-                    in_chlayout  &= ~cmp0;
-                    out_chlayout &= ~cmp1;
-                    /* add score for channel match, minus a deduction for
-                       having to do the substitution */
-                    score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
-                }
-            }
-
-            /* no penalty for LFE channel mismatch */
-            if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
-                (out_chlayout & AV_CH_LOW_FREQUENCY))
-                score += 10;
-            in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
-            out_chlayout &= ~AV_CH_LOW_FREQUENCY;
-
-            matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
-                                                                 out_chlayout);
-            extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
-                                                                 (~in_chlayout));
-            score += 10 * matched_channels - 5 * extra_channels;
-
-            if (score > best_score ||
-                (count_diff < best_count_diff && score == best_score)) {
-                best_score = score;
-                best_idx   = j;
-                best_count_diff = count_diff;
-            }
-        }
-        av_assert0(best_idx >= 0);
-        FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
-               outlink->in_channel_layouts->channel_layouts[best_idx]);
-    }
-
-}
-
-static void swap_channel_layouts(AVFilterGraph *graph)
-{
-    int i;
-
-    for (i = 0; i < graph->nb_filters; i++)
-        swap_channel_layouts_on_filter(graph->filters[i]);
-}
-
-static void swap_sample_fmts_on_filter(AVFilterContext *filter)
-{
-    AVFilterLink *link = NULL;
-    int format, bps;
-    int i, j;
-
-    for (i = 0; i < filter->nb_inputs; i++) {
-        link = filter->inputs[i];
-
-        if (link->type == AVMEDIA_TYPE_AUDIO &&
-            link->out_formats->nb_formats == 1)
-            break;
-    }
-    if (i == filter->nb_inputs)
-        return;
-
-    format = link->out_formats->formats[0];
-    bps    = av_get_bytes_per_sample(format);
-
-    for (i = 0; i < filter->nb_outputs; i++) {
-        AVFilterLink *outlink = filter->outputs[i];
-        int best_idx = -1, best_score = INT_MIN;
-
-        if (outlink->type != AVMEDIA_TYPE_AUDIO ||
-            outlink->in_formats->nb_formats < 2)
-            continue;
-
-        for (j = 0; j < outlink->in_formats->nb_formats; j++) {
-            int out_format = outlink->in_formats->formats[j];
-            int out_bps    = av_get_bytes_per_sample(out_format);
-            int score;
-
-            if (av_get_packed_sample_fmt(out_format) == format ||
-                av_get_planar_sample_fmt(out_format) == format) {
-                best_idx   = j;
-                break;
-            }
-
-            /* for s32 and float prefer double to prevent loss of information */
-            if (bps == 4 && out_bps == 8) {
-                best_idx = j;
-                break;
-            }
-
-            /* prefer closest higher or equal bps */
-            score = -abs(out_bps - bps);
-            if (out_bps >= bps)
-                score += INT_MAX/2;
-
-            if (score > best_score) {
-                best_score = score;
-                best_idx   = j;
-            }
-        }
-        av_assert0(best_idx >= 0);
-        FFSWAP(int, outlink->in_formats->formats[0],
-               outlink->in_formats->formats[best_idx]);
-    }
-}
-
-static void swap_sample_fmts(AVFilterGraph *graph)
-{
-    int i;
-
-    for (i = 0; i < graph->nb_filters; i++)
-        swap_sample_fmts_on_filter(graph->filters[i]);
-
-}
-
-static int pick_formats(AVFilterGraph *graph)
-{
-    int i, j, ret;
-    int change;
-
-    do{
-        change = 0;
-        for (i = 0; i < graph->nb_filters; i++) {
-            AVFilterContext *filter = graph->filters[i];
-            if (filter->nb_inputs){
-                for (j = 0; j < filter->nb_inputs; j++){
-                    if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->nb_formats == 1) {
-                        if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
-                            return ret;
-                        change = 1;
-                    }
-                }
-            }
-            if (filter->nb_outputs){
-                for (j = 0; j < filter->nb_outputs; j++){
-                    if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->nb_formats == 1) {
-                        if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
-                            return ret;
-                        change = 1;
-                    }
-                }
-            }
-            if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
-                for (j = 0; j < filter->nb_outputs; j++) {
-                    if(filter->outputs[j]->format<0) {
-                        if ((ret = pick_format(filter->outputs[j], filter->inputs[0])) < 0)
-                            return ret;
-                        change = 1;
-                    }
-                }
-            }
-        }
-    }while(change);
-
-    for (i = 0; i < graph->nb_filters; i++) {
-        AVFilterContext *filter = graph->filters[i];
-
-        for (j = 0; j < filter->nb_inputs; j++)
-            if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
-                return ret;
-        for (j = 0; j < filter->nb_outputs; j++)
-            if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
-                return ret;
-    }
-    return 0;
-}
-
-/**
- * Configure the formats of all the links in the graph.
- */
-static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
-{
-    int ret;
-
-    /* find supported formats from sub-filters, and merge along links */
-    while ((ret = query_formats(graph, log_ctx)) == AVERROR(EAGAIN))
-        av_log(graph, AV_LOG_DEBUG, "query_formats not finished\n");
-    if (ret < 0)
-        return ret;
-
-    /* Once everything is merged, it's possible that we'll still have
-     * multiple valid media format choices. We try to minimize the amount
-     * of format conversion inside filters */
-    reduce_formats(graph);
-
-    /* for audio filters, ensure the best format, sample rate and channel layout
-     * is selected */
-    swap_sample_fmts(graph);
-    swap_samplerates(graph);
-    swap_channel_layouts(graph);
-
-    if ((ret = pick_formats(graph)) < 0)
-        return ret;
-
-    return 0;
-}
-
-static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
-                                             AVClass *log_ctx)
-{
-    unsigned i, j;
-    int sink_links_count = 0, n = 0;
-    AVFilterContext *f;
-    AVFilterLink **sinks;
-
-    for (i = 0; i < graph->nb_filters; i++) {
-        f = graph->filters[i];
-        for (j = 0; j < f->nb_inputs; j++) {
-            f->inputs[j]->graph     = graph;
-            f->inputs[j]->age_index = -1;
-        }
-        for (j = 0; j < f->nb_outputs; j++) {
-            f->outputs[j]->graph    = graph;
-            f->outputs[j]->age_index= -1;
-        }
-        if (!f->nb_outputs) {
-            if (f->nb_inputs > INT_MAX - sink_links_count)
-                return AVERROR(EINVAL);
-            sink_links_count += f->nb_inputs;
-        }
-    }
-    sinks = av_calloc(sink_links_count, sizeof(*sinks));
-    if (!sinks)
-        return AVERROR(ENOMEM);
-    for (i = 0; i < graph->nb_filters; i++) {
-        f = graph->filters[i];
-        if (!f->nb_outputs) {
-            for (j = 0; j < f->nb_inputs; j++) {
-                sinks[n] = f->inputs[j];
-                f->inputs[j]->age_index = n++;
-            }
-        }
-    }
-    av_assert0(n == sink_links_count);
-    graph->sink_links       = sinks;
-    graph->sink_links_count = sink_links_count;
-    return 0;
-}
-
-static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
-{
-    AVFilterContext *f;
-    int i, j, ret;
-    int fifo_count = 0;
-
-    for (i = 0; i < graph->nb_filters; i++) {
-        f = graph->filters[i];
-
-        for (j = 0; j < f->nb_inputs; j++) {
-            AVFilterLink *link = f->inputs[j];
-            AVFilterContext *fifo_ctx;
-            AVFilter *fifo;
-            char name[32];
-
-            if (!link->dstpad->needs_fifo)
-                continue;
-
-            fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
-                   avfilter_get_by_name("fifo") :
-                   avfilter_get_by_name("afifo");
-
-            snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
-
-            ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
-                                               NULL, graph);
-            if (ret < 0)
-                return ret;
-
-            ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
-            if (ret < 0)
-                return ret;
-        }
-    }
-
-    return 0;
-}
-
-int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
-{
-    int ret;
-
-    if ((ret = graph_check_validity(graphctx, log_ctx)))
-        return ret;
-    if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
-        return ret;
-    if ((ret = graph_config_formats(graphctx, log_ctx)))
-        return ret;
-    if ((ret = graph_config_links(graphctx, log_ctx)))
-        return ret;
-    if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
-        return ret;
-
-    return 0;
-}
-
-int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
-{
-    int i, r = AVERROR(ENOSYS);
-
-    if (!graph)
-        return r;
-
-    if ((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
-        r = avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
-        if (r != AVERROR(ENOSYS))
-            return r;
-    }
-
-    if (res_len && res)
-        res[0] = 0;
-
-    for (i = 0; i < graph->nb_filters; i++) {
-        AVFilterContext *filter = graph->filters[i];
-        if (!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)) {
-            r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
-            if (r != AVERROR(ENOSYS)) {
-                if ((flags & AVFILTER_CMD_FLAG_ONE) || r < 0)
-                    return r;
-            }
-        }
-    }
-
-    return r;
-}
-
-int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
-{
-    int i;
-
-    if(!graph)
-        return 0;
-
-    for (i = 0; i < graph->nb_filters; i++) {
-        AVFilterContext *filter = graph->filters[i];
-        if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
-            AVFilterCommand **queue = &filter->command_queue, *next;
-            while (*queue && (*queue)->time <= ts)
-                queue = &(*queue)->next;
-            next = *queue;
-            *queue = av_mallocz(sizeof(AVFilterCommand));
-            (*queue)->command = av_strdup(command);
-            (*queue)->arg     = av_strdup(arg);
-            (*queue)->time    = ts;
-            (*queue)->flags   = flags;
-            (*queue)->next    = next;
-            if(flags & AVFILTER_CMD_FLAG_ONE)
-                return 0;
-        }
-    }
-
-    return 0;
-}
-
-static void heap_bubble_up(AVFilterGraph *graph,
-                           AVFilterLink *link, int index)
-{
-    AVFilterLink **links = graph->sink_links;
-
-    while (index) {
-        int parent = (index - 1) >> 1;
-        if (links[parent]->current_pts >= link->current_pts)
-            break;
-        links[index] = links[parent];
-        links[index]->age_index = index;
-        index = parent;
-    }
-    links[index] = link;
-    link->age_index = index;
-}
-
-static void heap_bubble_down(AVFilterGraph *graph,
-                             AVFilterLink *link, int index)
-{
-    AVFilterLink **links = graph->sink_links;
-
-    while (1) {
-        int child = 2 * index + 1;
-        if (child >= graph->sink_links_count)
-            break;
-        if (child + 1 < graph->sink_links_count &&
-            links[child + 1]->current_pts < links[child]->current_pts)
-            child++;
-        if (link->current_pts < links[child]->current_pts)
-            break;
-        links[index] = links[child];
-        links[index]->age_index = index;
-        index = child;
-    }
-    links[index] = link;
-    link->age_index = index;
-}
-
-void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
-{
-    heap_bubble_up  (graph, link, link->age_index);
-    heap_bubble_down(graph, link, link->age_index);
-}
-
-
-int avfilter_graph_request_oldest(AVFilterGraph *graph)
-{
-    while (graph->sink_links_count) {
-        AVFilterLink *oldest = graph->sink_links[0];
-        int r = ff_request_frame(oldest);
-        if (r != AVERROR_EOF)
-            return r;
-        av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
-               oldest->dst ? oldest->dst->name : "unknown",
-               oldest->dstpad ? oldest->dstpad->name : "unknown");
-        /* EOF: remove the link from the heap */
-        if (oldest->age_index < --graph->sink_links_count)
-            heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
-                             oldest->age_index);
-        oldest->age_index = -1;
-    }
-    return AVERROR_EOF;
-}