chasing indexing error

1 files changed, 0 insertions, 1154 deletions

diff --git a/ffmpeg/libavfilter/avfilter.c b/ffmpeg/libavfilter/avfilter.c
deleted file mode 100644
index 2567ce9..0000000
--- a/ffmpeg/libavfilter/avfilter.c
+++ /dev/null
@@ -1,1154 +0,0 @@
-/*
- * filter layer
- * 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 "libavutil/atomic.h"
-#include "libavutil/avassert.h"
-#include "libavutil/avstring.h"
-#include "libavutil/channel_layout.h"
-#include "libavutil/common.h"
-#include "libavutil/eval.h"
-#include "libavutil/imgutils.h"
-#include "libavutil/internal.h"
-#include "libavutil/opt.h"
-#include "libavutil/pixdesc.h"
-#include "libavutil/rational.h"
-#include "libavutil/samplefmt.h"
-
-#include "audio.h"
-#include "avfilter.h"
-#include "formats.h"
-#include "internal.h"
-
-static int ff_filter_frame_framed(AVFilterLink *link, AVFrame *frame);
-
-void ff_tlog_ref(void *ctx, AVFrame *ref, int end)
-{
-    av_unused char buf[16];
-    ff_tlog(ctx,
-            "ref[%p buf:%p data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
-            ref, ref->buf, ref->data[0],
-            ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
-            ref->pts, av_frame_get_pkt_pos(ref));
-
-    if (ref->width) {
-        ff_tlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",
-                ref->sample_aspect_ratio.num, ref->sample_aspect_ratio.den,
-                ref->width, ref->height,
-                !ref->interlaced_frame     ? 'P' :         /* Progressive  */
-                ref->top_field_first ? 'T' : 'B',    /* Top / Bottom */
-                ref->key_frame,
-                av_get_picture_type_char(ref->pict_type));
-    }
-    if (ref->nb_samples) {
-        ff_tlog(ctx, " cl:%"PRId64"d n:%d r:%d",
-                ref->channel_layout,
-                ref->nb_samples,
-                ref->sample_rate);
-    }
-
-    ff_tlog(ctx, "]%s", end ? "\n" : "");
-}
-
-unsigned avfilter_version(void)
-{
-    av_assert0(LIBAVFILTER_VERSION_MICRO >= 100);
-    return LIBAVFILTER_VERSION_INT;
-}
-
-const char *avfilter_configuration(void)
-{
-    return FFMPEG_CONFIGURATION;
-}
-
-const char *avfilter_license(void)
-{
-#define LICENSE_PREFIX "libavfilter license: "
-    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
-}
-
-void ff_command_queue_pop(AVFilterContext *filter)
-{
-    AVFilterCommand *c= filter->command_queue;
-    av_freep(&c->arg);
-    av_freep(&c->command);
-    filter->command_queue= c->next;
-    av_free(c);
-}
-
-int ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
-                   AVFilterPad **pads, AVFilterLink ***links,
-                   AVFilterPad *newpad)
-{
-    AVFilterLink **newlinks;
-    AVFilterPad *newpads;
-    unsigned i;
-
-    idx = FFMIN(idx, *count);
-
-    newpads  = av_realloc_array(*pads,  *count + 1, sizeof(AVFilterPad));
-    newlinks = av_realloc_array(*links, *count + 1, sizeof(AVFilterLink*));
-    if (newpads)
-        *pads  = newpads;
-    if (newlinks)
-        *links = newlinks;
-    if (!newpads || !newlinks)
-        return AVERROR(ENOMEM);
-
-    memmove(*pads  + idx + 1, *pads  + idx, sizeof(AVFilterPad)   * (*count - idx));
-    memmove(*links + idx + 1, *links + idx, sizeof(AVFilterLink*) * (*count - idx));
-    memcpy(*pads + idx, newpad, sizeof(AVFilterPad));
-    (*links)[idx] = NULL;
-
-    (*count)++;
-    for (i = idx + 1; i < *count; i++)
-        if ((*links)[i])
-            (*(unsigned *)((uint8_t *) (*links)[i] + padidx_off))++;
-
-    return 0;
-}
-
-int avfilter_link(AVFilterContext *src, unsigned srcpad,
-                  AVFilterContext *dst, unsigned dstpad)
-{
-    AVFilterLink *link;
-
-    if (src->nb_outputs <= srcpad || dst->nb_inputs <= dstpad ||
-        src->outputs[srcpad]      || dst->inputs[dstpad])
-        return -1;
-
-    if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
-        av_log(src, AV_LOG_ERROR,
-               "Media type mismatch between the '%s' filter output pad %d (%s) and the '%s' filter input pad %d (%s)\n",
-               src->name, srcpad, (char *)av_x_if_null(av_get_media_type_string(src->output_pads[srcpad].type), "?"),
-               dst->name, dstpad, (char *)av_x_if_null(av_get_media_type_string(dst-> input_pads[dstpad].type), "?"));
-        return AVERROR(EINVAL);
-    }
-
-    link = av_mallocz(sizeof(*link));
-    if (!link)
-        return AVERROR(ENOMEM);
-
-    src->outputs[srcpad] = dst->inputs[dstpad] = link;
-
-    link->src     = src;
-    link->dst     = dst;
-    link->srcpad  = &src->output_pads[srcpad];
-    link->dstpad  = &dst->input_pads[dstpad];
-    link->type    = src->output_pads[srcpad].type;
-    av_assert0(AV_PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
-    link->format  = -1;
-
-    return 0;
-}
-
-void avfilter_link_free(AVFilterLink **link)
-{
-    if (!*link)
-        return;
-
-    av_frame_free(&(*link)->partial_buf);
-
-    av_freep(link);
-}
-
-int avfilter_link_get_channels(AVFilterLink *link)
-{
-    return link->channels;
-}
-
-void avfilter_link_set_closed(AVFilterLink *link, int closed)
-{
-    link->closed = closed;
-}
-
-int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
-                           unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
-{
-    int ret;
-    unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
-
-    av_log(link->dst, AV_LOG_VERBOSE, "auto-inserting filter '%s' "
-           "between the filter '%s' and the filter '%s'\n",
-           filt->name, link->src->name, link->dst->name);
-
-    link->dst->inputs[dstpad_idx] = NULL;
-    if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
-        /* failed to link output filter to new filter */
-        link->dst->inputs[dstpad_idx] = link;
-        return ret;
-    }
-
-    /* re-hookup the link to the new destination filter we inserted */
-    link->dst                     = filt;
-    link->dstpad                  = &filt->input_pads[filt_srcpad_idx];
-    filt->inputs[filt_srcpad_idx] = link;
-
-    /* if any information on supported media formats already exists on the
-     * link, we need to preserve that */
-    if (link->out_formats)
-        ff_formats_changeref(&link->out_formats,
-                             &filt->outputs[filt_dstpad_idx]->out_formats);
-    if (link->out_samplerates)
-        ff_formats_changeref(&link->out_samplerates,
-                             &filt->outputs[filt_dstpad_idx]->out_samplerates);
-    if (link->out_channel_layouts)
-        ff_channel_layouts_changeref(&link->out_channel_layouts,
-                                     &filt->outputs[filt_dstpad_idx]->out_channel_layouts);
-
-    return 0;
-}
-
-int avfilter_config_links(AVFilterContext *filter)
-{
-    int (*config_link)(AVFilterLink *);
-    unsigned i;
-    int ret;
-
-    for (i = 0; i < filter->nb_inputs; i ++) {
-        AVFilterLink *link = filter->inputs[i];
-        AVFilterLink *inlink;
-
-        if (!link) continue;
-
-        inlink = link->src->nb_inputs ? link->src->inputs[0] : NULL;
-        link->current_pts = AV_NOPTS_VALUE;
-
-        switch (link->init_state) {
-        case AVLINK_INIT:
-            continue;
-        case AVLINK_STARTINIT:
-            av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
-            return 0;
-        case AVLINK_UNINIT:
-            link->init_state = AVLINK_STARTINIT;
-
-            if ((ret = avfilter_config_links(link->src)) < 0)
-                return ret;
-
-            if (!(config_link = link->srcpad->config_props)) {
-                if (link->src->nb_inputs != 1) {
-                    av_log(link->src, AV_LOG_ERROR, "Source filters and filters "
-                                                    "with more than one input "
-                                                    "must set config_props() "
-                                                    "callbacks on all outputs\n");
-                    return AVERROR(EINVAL);
-                }
-            } else if ((ret = config_link(link)) < 0) {
-                av_log(link->src, AV_LOG_ERROR,
-                       "Failed to configure output pad on %s\n",
-                       link->src->name);
-                return ret;
-            }
-
-            switch (link->type) {
-            case AVMEDIA_TYPE_VIDEO:
-                if (!link->time_base.num && !link->time_base.den)
-                    link->time_base = inlink ? inlink->time_base : AV_TIME_BASE_Q;
-
-                if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den)
-                    link->sample_aspect_ratio = inlink ?
-                        inlink->sample_aspect_ratio : (AVRational){1,1};
-
-                if (inlink && !link->frame_rate.num && !link->frame_rate.den)
-                    link->frame_rate = inlink->frame_rate;
-
-                if (inlink) {
-                    if (!link->w)
-                        link->w = inlink->w;
-                    if (!link->h)
-                        link->h = inlink->h;
-                } else if (!link->w || !link->h) {
-                    av_log(link->src, AV_LOG_ERROR,
-                           "Video source filters must set their output link's "
-                           "width and height\n");
-                    return AVERROR(EINVAL);
-                }
-                break;
-
-            case AVMEDIA_TYPE_AUDIO:
-                if (inlink) {
-                    if (!link->time_base.num && !link->time_base.den)
-                        link->time_base = inlink->time_base;
-                }
-
-                if (!link->time_base.num && !link->time_base.den)
-                    link->time_base = (AVRational) {1, link->sample_rate};
-            }
-
-            if ((config_link = link->dstpad->config_props))
-                if ((ret = config_link(link)) < 0) {
-                    av_log(link->src, AV_LOG_ERROR,
-                           "Failed to configure input pad on %s\n",
-                           link->dst->name);
-                    return ret;
-                }
-
-            link->init_state = AVLINK_INIT;
-        }
-    }
-
-    return 0;
-}
-
-void ff_tlog_link(void *ctx, AVFilterLink *link, int end)
-{
-    if (link->type == AVMEDIA_TYPE_VIDEO) {
-        ff_tlog(ctx,
-                "link[%p s:%dx%d fmt:%s %s->%s]%s",
-                link, link->w, link->h,
-                av_get_pix_fmt_name(link->format),
-                link->src ? link->src->filter->name : "",
-                link->dst ? link->dst->filter->name : "",
-                end ? "\n" : "");
-    } else {
-        char buf[128];
-        av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
-
-        ff_tlog(ctx,
-                "link[%p r:%d cl:%s fmt:%s %s->%s]%s",
-                link, (int)link->sample_rate, buf,
-                av_get_sample_fmt_name(link->format),
-                link->src ? link->src->filter->name : "",
-                link->dst ? link->dst->filter->name : "",
-                end ? "\n" : "");
-    }
-}
-
-int ff_request_frame(AVFilterLink *link)
-{
-    int ret = -1;
-    FF_TPRINTF_START(NULL, request_frame); ff_tlog_link(NULL, link, 1);
-
-    if (link->closed)
-        return AVERROR_EOF;
-    av_assert0(!link->frame_requested);
-    link->frame_requested = 1;
-    while (link->frame_requested) {
-        if (link->srcpad->request_frame)
-            ret = link->srcpad->request_frame(link);
-        else if (link->src->inputs[0])
-            ret = ff_request_frame(link->src->inputs[0]);
-        if (ret == AVERROR_EOF && link->partial_buf) {
-            AVFrame *pbuf = link->partial_buf;
-            link->partial_buf = NULL;
-            ret = ff_filter_frame_framed(link, pbuf);
-        }
-        if (ret < 0) {
-            link->frame_requested = 0;
-            if (ret == AVERROR_EOF)
-                link->closed = 1;
-        } else {
-            av_assert0(!link->frame_requested ||
-                       link->flags & FF_LINK_FLAG_REQUEST_LOOP);
-        }
-    }
-    return ret;
-}
-
-int ff_poll_frame(AVFilterLink *link)
-{
-    int i, min = INT_MAX;
-
-    if (link->srcpad->poll_frame)
-        return link->srcpad->poll_frame(link);
-
-    for (i = 0; i < link->src->nb_inputs; i++) {
-        int val;
-        if (!link->src->inputs[i])
-            return -1;
-        val = ff_poll_frame(link->src->inputs[i]);
-        min = FFMIN(min, val);
-    }
-
-    return min;
-}
-
-static const char *const var_names[] = {   "t",   "n",   "pos",        NULL };
-enum                                   { VAR_T, VAR_N, VAR_POS, VAR_VARS_NB };
-
-static int set_enable_expr(AVFilterContext *ctx, const char *expr)
-{
-    int ret;
-    char *expr_dup;
-    AVExpr *old = ctx->enable;
-
-    if (!(ctx->filter->flags & AVFILTER_FLAG_SUPPORT_TIMELINE)) {
-        av_log(ctx, AV_LOG_ERROR, "Timeline ('enable' option) not supported "
-               "with filter '%s'\n", ctx->filter->name);
-        return AVERROR_PATCHWELCOME;
-    }
-
-    expr_dup = av_strdup(expr);
-    if (!expr_dup)
-        return AVERROR(ENOMEM);
-
-    if (!ctx->var_values) {
-        ctx->var_values = av_calloc(VAR_VARS_NB, sizeof(*ctx->var_values));
-        if (!ctx->var_values) {
-            av_free(expr_dup);
-            return AVERROR(ENOMEM);
-        }
-    }
-
-    ret = av_expr_parse((AVExpr**)&ctx->enable, expr_dup, var_names,
-                        NULL, NULL, NULL, NULL, 0, ctx->priv);
-    if (ret < 0) {
-        av_log(ctx->priv, AV_LOG_ERROR,
-               "Error when evaluating the expression '%s' for enable\n",
-               expr_dup);
-        av_free(expr_dup);
-        return ret;
-    }
-
-    av_expr_free(old);
-    av_free(ctx->enable_str);
-    ctx->enable_str = expr_dup;
-    return 0;
-}
-
-void ff_update_link_current_pts(AVFilterLink *link, int64_t pts)
-{
-    if (pts == AV_NOPTS_VALUE)
-        return;
-    link->current_pts = av_rescale_q(pts, link->time_base, AV_TIME_BASE_Q);
-    /* TODO use duration */
-    if (link->graph && link->age_index >= 0)
-        ff_avfilter_graph_update_heap(link->graph, link);
-}
-
-int avfilter_process_command(AVFilterContext *filter, const char *cmd, const char *arg, char *res, int res_len, int flags)
-{
-    if(!strcmp(cmd, "ping")){
-        char local_res[256] = {0};
-
-        if (!res) {
-            res = local_res;
-            res_len = sizeof(local_res);
-        }
-        av_strlcatf(res, res_len, "pong from:%s %s\n", filter->filter->name, filter->name);
-        if (res == local_res)
-            av_log(filter, AV_LOG_INFO, "%s", res);
-        return 0;
-    }else if(!strcmp(cmd, "enable")) {
-        return set_enable_expr(filter, arg);
-    }else if(filter->filter->process_command) {
-        return filter->filter->process_command(filter, cmd, arg, res, res_len, flags);
-    }
-    return AVERROR(ENOSYS);
-}
-
-static AVFilter *first_filter;
-
-#if !FF_API_NOCONST_GET_NAME
-const
-#endif
-AVFilter *avfilter_get_by_name(const char *name)
-{
-    const AVFilter *f = NULL;
-
-    if (!name)
-        return NULL;
-
-    while ((f = avfilter_next(f)))
-        if (!strcmp(f->name, name))
-            return (AVFilter *)f;
-
-    return NULL;
-}
-
-int avfilter_register(AVFilter *filter)
-{
-    AVFilter **f = &first_filter;
-    int i;
-
-    /* the filter must select generic or internal exclusively */
-    av_assert0((filter->flags & AVFILTER_FLAG_SUPPORT_TIMELINE) != AVFILTER_FLAG_SUPPORT_TIMELINE);
-
-    for(i=0; filter->inputs && filter->inputs[i].name; i++) {
-        const AVFilterPad *input = &filter->inputs[i];
-        av_assert0(     !input->filter_frame
-                    || (!input->start_frame && !input->end_frame));
-    }
-
-    filter->next = NULL;
-
-    while(*f || avpriv_atomic_ptr_cas((void * volatile *)f, NULL, filter))
-        f = &(*f)->next;
-
-    return 0;
-}
-
-const AVFilter *avfilter_next(const AVFilter *prev)
-{
-    return prev ? prev->next : first_filter;
-}
-
-#if FF_API_OLD_FILTER_REGISTER
-AVFilter **av_filter_next(AVFilter **filter)
-{
-    return filter ? &(*filter)->next : &first_filter;
-}
-
-void avfilter_uninit(void)
-{
-}
-#endif
-
-int avfilter_pad_count(const AVFilterPad *pads)
-{
-    int count;
-
-    if (!pads)
-        return 0;
-
-    for (count = 0; pads->name; count++)
-        pads++;
-    return count;
-}
-
-static const char *default_filter_name(void *filter_ctx)
-{
-    AVFilterContext *ctx = filter_ctx;
-    return ctx->name ? ctx->name : ctx->filter->name;
-}
-
-static void *filter_child_next(void *obj, void *prev)
-{
-    AVFilterContext *ctx = obj;
-    if (!prev && ctx->filter && ctx->filter->priv_class && ctx->priv)
-        return ctx->priv;
-    return NULL;
-}
-
-static const AVClass *filter_child_class_next(const AVClass *prev)
-{
-    const AVFilter *f = NULL;
-
-    /* find the filter that corresponds to prev */
-    while (prev && (f = avfilter_next(f)))
-        if (f->priv_class == prev)
-            break;
-
-    /* could not find filter corresponding to prev */
-    if (prev && !f)
-        return NULL;
-
-    /* find next filter with specific options */
-    while ((f = avfilter_next(f)))
-        if (f->priv_class)
-            return f->priv_class;
-
-    return NULL;
-}
-
-#define OFFSET(x) offsetof(AVFilterContext, x)
-#define FLAGS AV_OPT_FLAG_FILTERING_PARAM
-static const AVOption avfilter_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 }, .unit = "thread_type" },
-    { "enable", "set enable expression", OFFSET(enable_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
-    { NULL },
-};
-
-static const AVClass avfilter_class = {
-    .class_name = "AVFilter",
-    .item_name  = default_filter_name,
-    .version    = LIBAVUTIL_VERSION_INT,
-    .category   = AV_CLASS_CATEGORY_FILTER,
-    .child_next = filter_child_next,
-    .child_class_next = filter_child_class_next,
-    .option           = avfilter_options,
-};
-
-static int default_execute(AVFilterContext *ctx, avfilter_action_func *func, void *arg,
-                           int *ret, int nb_jobs)
-{
-    int i;
-
-    for (i = 0; i < nb_jobs; i++) {
-        int r = func(ctx, arg, i, nb_jobs);
-        if (ret)
-            ret[i] = r;
-    }
-    return 0;
-}
-
-AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name)
-{
-    AVFilterContext *ret;
-
-    if (!filter)
-        return NULL;
-
-    ret = av_mallocz(sizeof(AVFilterContext));
-    if (!ret)
-        return NULL;
-
-    ret->av_class = &avfilter_class;
-    ret->filter   = filter;
-    ret->name     = inst_name ? av_strdup(inst_name) : NULL;
-    if (filter->priv_size) {
-        ret->priv     = av_mallocz(filter->priv_size);
-        if (!ret->priv)
-            goto err;
-    }
-
-    av_opt_set_defaults(ret);
-    if (filter->priv_class) {
-        *(const AVClass**)ret->priv = filter->priv_class;
-        av_opt_set_defaults(ret->priv);
-    }
-
-    ret->internal = av_mallocz(sizeof(*ret->internal));
-    if (!ret->internal)
-        goto err;
-    ret->internal->execute = default_execute;
-
-    ret->nb_inputs = avfilter_pad_count(filter->inputs);
-    if (ret->nb_inputs ) {
-        ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->nb_inputs);
-        if (!ret->input_pads)
-            goto err;
-        memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->nb_inputs);
-        ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->nb_inputs);
-        if (!ret->inputs)
-            goto err;
-    }
-
-    ret->nb_outputs = avfilter_pad_count(filter->outputs);
-    if (ret->nb_outputs) {
-        ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->nb_outputs);
-        if (!ret->output_pads)
-            goto err;
-        memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->nb_outputs);
-        ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->nb_outputs);
-        if (!ret->outputs)
-            goto err;
-    }
-#if FF_API_FOO_COUNT
-FF_DISABLE_DEPRECATION_WARNINGS
-    ret->output_count = ret->nb_outputs;
-    ret->input_count  = ret->nb_inputs;
-FF_ENABLE_DEPRECATION_WARNINGS
-#endif
-
-    return ret;
-
-err:
-    av_freep(&ret->inputs);
-    av_freep(&ret->input_pads);
-    ret->nb_inputs = 0;
-    av_freep(&ret->outputs);
-    av_freep(&ret->output_pads);
-    ret->nb_outputs = 0;
-    av_freep(&ret->priv);
-    av_freep(&ret->internal);
-    av_free(ret);
-    return NULL;
-}
-
-#if FF_API_AVFILTER_OPEN
-int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
-{
-    *filter_ctx = ff_filter_alloc(filter, inst_name);
-    return *filter_ctx ? 0 : AVERROR(ENOMEM);
-}
-#endif
-
-static void free_link(AVFilterLink *link)
-{
-    if (!link)
-        return;
-
-    if (link->src)
-        link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
-    if (link->dst)
-        link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
-
-    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);
-    avfilter_link_free(&link);
-}
-
-void avfilter_free(AVFilterContext *filter)
-{
-    int i;
-
-    if (!filter)
-        return;
-
-    if (filter->graph)
-        ff_filter_graph_remove_filter(filter->graph, filter);
-
-    if (filter->filter->uninit)
-        filter->filter->uninit(filter);
-
-    for (i = 0; i < filter->nb_inputs; i++) {
-        free_link(filter->inputs[i]);
-    }
-    for (i = 0; i < filter->nb_outputs; i++) {
-        free_link(filter->outputs[i]);
-    }
-
-    if (filter->filter->priv_class)
-        av_opt_free(filter->priv);
-
-    av_freep(&filter->name);
-    av_freep(&filter->input_pads);
-    av_freep(&filter->output_pads);
-    av_freep(&filter->inputs);
-    av_freep(&filter->outputs);
-    av_freep(&filter->priv);
-    while(filter->command_queue){
-        ff_command_queue_pop(filter);
-    }
-    av_opt_free(filter);
-    av_expr_free(filter->enable);
-    filter->enable = NULL;
-    av_freep(&filter->var_values);
-    av_freep(&filter->internal);
-    av_free(filter);
-}
-
-static int process_options(AVFilterContext *ctx, AVDictionary **options,
-                           const char *args)
-{
-    const AVOption *o = NULL;
-    int ret, count = 0;
-    char *av_uninit(parsed_key), *av_uninit(value);
-    const char *key;
-    int offset= -1;
-
-    if (!args)
-        return 0;
-
-    while (*args) {
-        const char *shorthand = NULL;
-
-        o = av_opt_next(ctx->priv, o);
-        if (o) {
-            if (o->type == AV_OPT_TYPE_CONST || o->offset == offset)
-                continue;
-            offset = o->offset;
-            shorthand = o->name;
-        }
-
-        ret = av_opt_get_key_value(&args, "=", ":",
-                                   shorthand ? AV_OPT_FLAG_IMPLICIT_KEY : 0,
-                                   &parsed_key, &value);
-        if (ret < 0) {
-            if (ret == AVERROR(EINVAL))
-                av_log(ctx, AV_LOG_ERROR, "No option name near '%s'\n", args);
-            else
-                av_log(ctx, AV_LOG_ERROR, "Unable to parse '%s': %s\n", args,
-                       av_err2str(ret));
-            return ret;
-        }
-        if (*args)
-            args++;
-        if (parsed_key) {
-            key = parsed_key;
-            while ((o = av_opt_next(ctx->priv, o))); /* discard all remaining shorthand */
-        } else {
-            key = shorthand;
-        }
-
-        av_log(ctx, AV_LOG_DEBUG, "Setting '%s' to value '%s'\n", key, value);
-
-        if (av_opt_find(ctx, key, NULL, 0, 0)) {
-            ret = av_opt_set(ctx, key, value, 0);
-            if (ret < 0) {
-                av_free(value);
-                av_free(parsed_key);
-                return ret;
-            }
-        } else {
-        av_dict_set(options, key, value, 0);
-        if ((ret = av_opt_set(ctx->priv, key, value, 0)) < 0) {
-            if (!av_opt_find(ctx->priv, key, NULL, 0, AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)) {
-            if (ret == AVERROR_OPTION_NOT_FOUND)
-                av_log(ctx, AV_LOG_ERROR, "Option '%s' not found\n", key);
-            av_free(value);
-            av_free(parsed_key);
-            return ret;
-            }
-        }
-        }
-
-        av_free(value);
-        av_free(parsed_key);
-        count++;
-    }
-
-    if (ctx->enable_str) {
-        ret = set_enable_expr(ctx, ctx->enable_str);
-        if (ret < 0)
-            return ret;
-    }
-    return count;
-}
-
-#if FF_API_AVFILTER_INIT_FILTER
-int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
-{
-    return avfilter_init_str(filter, args);
-}
-#endif
-
-int avfilter_init_dict(AVFilterContext *ctx, AVDictionary **options)
-{
-    int ret = 0;
-
-    ret = av_opt_set_dict(ctx, options);
-    if (ret < 0) {
-        av_log(ctx, AV_LOG_ERROR, "Error applying generic filter options.\n");
-        return ret;
-    }
-
-    if (ctx->filter->flags & AVFILTER_FLAG_SLICE_THREADS &&
-        ctx->thread_type & ctx->graph->thread_type & AVFILTER_THREAD_SLICE &&
-        ctx->graph->internal->thread_execute) {
-        ctx->thread_type       = AVFILTER_THREAD_SLICE;
-        ctx->internal->execute = ctx->graph->internal->thread_execute;
-    } else {
-        ctx->thread_type = 0;
-    }
-
-    if (ctx->filter->priv_class) {
-        ret = av_opt_set_dict(ctx->priv, options);
-        if (ret < 0) {
-            av_log(ctx, AV_LOG_ERROR, "Error applying options to the filter.\n");
-            return ret;
-        }
-    }
-
-    if (ctx->filter->init_opaque)
-        ret = ctx->filter->init_opaque(ctx, NULL);
-    else if (ctx->filter->init)
-        ret = ctx->filter->init(ctx);
-    else if (ctx->filter->init_dict)
-        ret = ctx->filter->init_dict(ctx, options);
-
-    return ret;
-}
-
-int avfilter_init_str(AVFilterContext *filter, const char *args)
-{
-    AVDictionary *options = NULL;
-    AVDictionaryEntry *e;
-    int ret = 0;
-
-    if (args && *args) {
-        if (!filter->filter->priv_class) {
-            av_log(filter, AV_LOG_ERROR, "This filter does not take any "
-                   "options, but options were provided: %s.\n", args);
-            return AVERROR(EINVAL);
-        }
-
-#if FF_API_OLD_FILTER_OPTS
-            if (   !strcmp(filter->filter->name, "format")     ||
-                   !strcmp(filter->filter->name, "noformat")   ||
-                   !strcmp(filter->filter->name, "frei0r")     ||
-                   !strcmp(filter->filter->name, "frei0r_src") ||
-                   !strcmp(filter->filter->name, "ocv")        ||
-                   !strcmp(filter->filter->name, "pan")        ||
-                   !strcmp(filter->filter->name, "pp")         ||
-                   !strcmp(filter->filter->name, "aevalsrc")) {
-            /* a hack for compatibility with the old syntax
-             * replace colons with |s */
-            char *copy = av_strdup(args);
-            char *p    = copy;
-            int nb_leading = 0; // number of leading colons to skip
-            int deprecated = 0;
-
-            if (!copy) {
-                ret = AVERROR(ENOMEM);
-                goto fail;
-            }
-
-            if (!strcmp(filter->filter->name, "frei0r") ||
-                !strcmp(filter->filter->name, "ocv"))
-                nb_leading = 1;
-            else if (!strcmp(filter->filter->name, "frei0r_src"))
-                nb_leading = 3;
-
-            while (nb_leading--) {
-                p = strchr(p, ':');
-                if (!p) {
-                    p = copy + strlen(copy);
-                    break;
-                }
-                p++;
-            }
-
-            deprecated = strchr(p, ':') != NULL;
-
-            if (!strcmp(filter->filter->name, "aevalsrc")) {
-                deprecated = 0;
-                while ((p = strchr(p, ':')) && p[1] != ':') {
-                    const char *epos = strchr(p + 1, '=');
-                    const char *spos = strchr(p + 1, ':');
-                    const int next_token_is_opt = epos && (!spos || epos < spos);
-                    if (next_token_is_opt) {
-                        p++;
-                        break;
-                    }
-                    /* next token does not contain a '=', assume a channel expression */
-                    deprecated = 1;
-                    *p++ = '|';
-                }
-                if (p && *p == ':') { // double sep '::' found
-                    deprecated = 1;
-                    memmove(p, p + 1, strlen(p));
-                }
-            } else
-            while ((p = strchr(p, ':')))
-                *p++ = '|';
-
-            if (deprecated)
-                av_log(filter, AV_LOG_WARNING, "This syntax is deprecated. Use "
-                       "'|' to separate the list items.\n");
-
-            av_log(filter, AV_LOG_DEBUG, "compat: called with args=[%s]\n", copy);
-            ret = process_options(filter, &options, copy);
-            av_freep(&copy);
-
-            if (ret < 0)
-                goto fail;
-#endif
-        } else {
-#if CONFIG_MP_FILTER
-            if (!strcmp(filter->filter->name, "mp")) {
-                char *escaped;
-
-                if (!strncmp(args, "filter=", 7))
-                    args += 7;
-                ret = av_escape(&escaped, args, ":=", AV_ESCAPE_MODE_BACKSLASH, 0);
-                if (ret < 0) {
-                    av_log(filter, AV_LOG_ERROR, "Unable to escape MPlayer filters arg '%s'\n", args);
-                    goto fail;
-                }
-                ret = process_options(filter, &options, escaped);
-                av_free(escaped);
-            } else
-#endif
-            ret = process_options(filter, &options, args);
-            if (ret < 0)
-                goto fail;
-        }
-    }
-
-    ret = avfilter_init_dict(filter, &options);
-    if (ret < 0)
-        goto fail;
-
-    if ((e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
-        av_log(filter, AV_LOG_ERROR, "No such option: %s.\n", e->key);
-        ret = AVERROR_OPTION_NOT_FOUND;
-        goto fail;
-    }
-
-fail:
-    av_dict_free(&options);
-
-    return ret;
-}
-
-const char *avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx)
-{
-    return pads[pad_idx].name;
-}
-
-enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx)
-{
-    return pads[pad_idx].type;
-}
-
-static int default_filter_frame(AVFilterLink *link, AVFrame *frame)
-{
-    return ff_filter_frame(link->dst->outputs[0], frame);
-}
-
-static int ff_filter_frame_framed(AVFilterLink *link, AVFrame *frame)
-{
-    int (*filter_frame)(AVFilterLink *, AVFrame *);
-    AVFilterContext *dstctx = link->dst;
-    AVFilterPad *dst = link->dstpad;
-    AVFrame *out;
-    int ret;
-    AVFilterCommand *cmd= link->dst->command_queue;
-    int64_t pts;
-
-    if (link->closed) {
-        av_frame_free(&frame);
-        return AVERROR_EOF;
-    }
-
-    if (!(filter_frame = dst->filter_frame))
-        filter_frame = default_filter_frame;
-
-    /* copy the frame if needed */
-    if (dst->needs_writable && !av_frame_is_writable(frame)) {
-        av_log(link->dst, AV_LOG_DEBUG, "Copying data in avfilter.\n");
-
-        /* Maybe use ff_copy_buffer_ref instead? */
-        switch (link->type) {
-        case AVMEDIA_TYPE_VIDEO:
-            out = ff_get_video_buffer(link, link->w, link->h);
-            break;
-        case AVMEDIA_TYPE_AUDIO:
-            out = ff_get_audio_buffer(link, frame->nb_samples);
-            break;
-        default: return AVERROR(EINVAL);
-        }
-        if (!out) {
-            av_frame_free(&frame);
-            return AVERROR(ENOMEM);
-        }
-        av_frame_copy_props(out, frame);
-
-        switch (link->type) {
-        case AVMEDIA_TYPE_VIDEO:
-            av_image_copy(out->data, out->linesize, (const uint8_t **)frame->data, frame->linesize,
-                          frame->format, frame->width, frame->height);
-            break;
-        case AVMEDIA_TYPE_AUDIO:
-            av_samples_copy(out->extended_data, frame->extended_data,
-                            0, 0, frame->nb_samples,
-                            av_get_channel_layout_nb_channels(frame->channel_layout),
-                            frame->format);
-            break;
-        default: return AVERROR(EINVAL);
-        }
-
-        av_frame_free(&frame);
-    } else
-        out = frame;
-
-    while(cmd && cmd->time <= out->pts * av_q2d(link->time_base)){
-        av_log(link->dst, AV_LOG_DEBUG,
-               "Processing command time:%f command:%s arg:%s\n",
-               cmd->time, cmd->command, cmd->arg);
-        avfilter_process_command(link->dst, cmd->command, cmd->arg, 0, 0, cmd->flags);
-        ff_command_queue_pop(link->dst);
-        cmd= link->dst->command_queue;
-    }
-
-    pts = out->pts;
-    if (dstctx->enable_str) {
-        int64_t pos = av_frame_get_pkt_pos(out);
-        dstctx->var_values[VAR_N] = link->frame_count;
-        dstctx->var_values[VAR_T] = pts == AV_NOPTS_VALUE ? NAN : pts * av_q2d(link->time_base);
-        dstctx->var_values[VAR_POS] = pos == -1 ? NAN : pos;
-
-        dstctx->is_disabled = fabs(av_expr_eval(dstctx->enable, dstctx->var_values, NULL)) < 0.5;
-        if (dstctx->is_disabled &&
-            (dstctx->filter->flags & AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC))
-            filter_frame = default_filter_frame;
-    }
-    ret = filter_frame(link, out);
-    link->frame_count++;
-    link->frame_requested = 0;
-    ff_update_link_current_pts(link, pts);
-    return ret;
-}
-
-static int ff_filter_frame_needs_framing(AVFilterLink *link, AVFrame *frame)
-{
-    int insamples = frame->nb_samples, inpos = 0, nb_samples;
-    AVFrame *pbuf = link->partial_buf;
-    int nb_channels = av_frame_get_channels(frame);
-    int ret = 0;
-
-    link->flags |= FF_LINK_FLAG_REQUEST_LOOP;
-    /* Handle framing (min_samples, max_samples) */
-    while (insamples) {
-        if (!pbuf) {
-            AVRational samples_tb = { 1, link->sample_rate };
-            pbuf = ff_get_audio_buffer(link, link->partial_buf_size);
-            if (!pbuf) {
-                av_log(link->dst, AV_LOG_WARNING,
-                       "Samples dropped due to memory allocation failure.\n");
-                return 0;
-            }
-            av_frame_copy_props(pbuf, frame);
-            pbuf->pts = frame->pts;
-            if (pbuf->pts != AV_NOPTS_VALUE)
-                pbuf->pts += av_rescale_q(inpos, samples_tb, link->time_base);
-            pbuf->nb_samples = 0;
-        }
-        nb_samples = FFMIN(insamples,
-                           link->partial_buf_size - pbuf->nb_samples);
-        av_samples_copy(pbuf->extended_data, frame->extended_data,
-                        pbuf->nb_samples, inpos,
-                        nb_samples, nb_channels, link->format);
-        inpos                   += nb_samples;
-        insamples               -= nb_samples;
-        pbuf->nb_samples += nb_samples;
-        if (pbuf->nb_samples >= link->min_samples) {
-            ret = ff_filter_frame_framed(link, pbuf);
-            pbuf = NULL;
-        }
-    }
-    av_frame_free(&frame);
-    link->partial_buf = pbuf;
-    return ret;
-}
-
-int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
-{
-    FF_TPRINTF_START(NULL, filter_frame); ff_tlog_link(NULL, link, 1); ff_tlog(NULL, " "); ff_tlog_ref(NULL, frame, 1);
-
-    /* Consistency checks */
-    if (link->type == AVMEDIA_TYPE_VIDEO) {
-        if (strcmp(link->dst->filter->name, "scale")) {
-            av_assert1(frame->format                 == link->format);
-            av_assert1(frame->width               == link->w);
-            av_assert1(frame->height               == link->h);
-        }
-    } else {
-        av_assert1(frame->format                == link->format);
-        av_assert1(av_frame_get_channels(frame) == link->channels);
-        av_assert1(frame->channel_layout        == link->channel_layout);
-        av_assert1(frame->sample_rate           == link->sample_rate);
-    }
-
-    /* Go directly to actual filtering if possible */
-    if (link->type == AVMEDIA_TYPE_AUDIO &&
-        link->min_samples &&
-        (link->partial_buf ||
-         frame->nb_samples < link->min_samples ||
-         frame->nb_samples > link->max_samples)) {
-        return ff_filter_frame_needs_framing(link, frame);
-    } else {
-        return ff_filter_frame_framed(link, frame);
-    }
-}
-
-const AVClass *avfilter_get_class(void)
-{
-    return &avfilter_class;
-}