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/*

 * 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;

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(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(©);

            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);