/* * filter layer * Copyright (c) 2007 Bobby Bingham * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* #define DEBUG */ #include "libavutil/avstring.h"#include "libavutil/channel_layout.h"#include "libavutil/common.h"#include "libavutil/imgutils.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"#include "video.h" unsigned avfilter_version(void) {    return LIBAVFILTER_VERSION_INT;} const char *avfilter_configuration(void){    return LIBAV_CONFIGURATION;} const char *avfilter_license(void){#define LICENSE_PREFIX "libavfilter license: "    return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;} void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,                   AVFilterPad **pads, AVFilterLink ***links,                   AVFilterPad *newpad){    unsigned i;     idx = FFMIN(idx, *count);     *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));    *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));    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))++;} 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 and the '%s' filter input pad %d\n",               src->name, srcpad, dst->name, dstpad);        return AVERROR(EINVAL);    }     src->outputs[srcpad] =    dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));     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;    assert(AV_PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);    link->format  = -1;     return 0;} 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];         if (!link) continue;         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;            }             if (link->time_base.num == 0 && link->time_base.den == 0)                link->time_base = link->src && link->src->nb_inputs ?                    link->src->inputs[0]->time_base : AV_TIME_BASE_Q;             if (link->type == AVMEDIA_TYPE_VIDEO) {                if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den)                    link->sample_aspect_ratio = link->src->nb_inputs ?                        link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};                 if (link->src->nb_inputs) {                    if (!link->w)                        link->w = link->src->inputs[0]->w;                    if (!link->h)                        link->h = link->src->inputs[0]->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);                }            }             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_dlog_link(void *ctx, AVFilterLink *link, int end){    if (link->type == AVMEDIA_TYPE_VIDEO) {        av_dlog(ctx,                "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%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);         av_dlog(ctx,                "link[%p r:%d cl:%s fmt:%-16s %-16s->%-16s]%s",                link, 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){    FF_DPRINTF_START(NULL, request_frame); ff_dlog_link(NULL, link, 1);     if (link->srcpad->request_frame)        return link->srcpad->request_frame(link);    else if (link->src->inputs[0])        return ff_request_frame(link->src->inputs[0]);    else return -1;} 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 AVFilter *first_filter; AVFilter *avfilter_get_by_name(const char *name){    AVFilter *f = NULL;     if (!name)        return NULL;     while ((f = avfilter_next(f)))        if (!strcmp(f->name, name))            return f;     return NULL;} int avfilter_register(AVFilter *filter){    AVFilter **f = &first_filter;    while (*f)        f = &(*f)->next;    *f = filter;    filter->next = NULL;    return 0;} const AVFilter *avfilter_next(const AVFilter *prev){    return prev ? prev->next : first_filter;} #if FF_API_OLD_FILTER_REGISTERAVFilter **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 *filter_name(void *p){    AVFilterContext *filter = p;    return filter->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){    AVFilter *f = NULL;     while (prev && (f = avfilter_next(f)))        if (f->priv_class == prev)            break;     while ((f = avfilter_next(f)))        if (f->priv_class)            return f->priv_class;     return NULL;} static const AVClass avfilter_class = {    .class_name = "AVFilter",    .item_name  = filter_name,    .version    = LIBAVUTIL_VERSION_INT,    .child_next = filter_child_next,    .child_class_next = filter_child_class_next,}; 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;    }     if (filter->priv_class) {        *(const AVClass**)ret->priv = filter->priv_class;        av_opt_set_defaults(ret->priv);    }     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    ret->output_count = ret->nb_outputs;    ret->input_count  = ret->nb_inputs;#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_free(ret);    return NULL;} #if FF_API_AVFILTER_OPENint 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 void avfilter_free(AVFilterContext *filter){    int i;    AVFilterLink *link;     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++) {        if ((link = filter->inputs[i])) {            if (link->src)                link->src->outputs[link->srcpad - link->src->output_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);        }        av_freep(&link);    }    for (i = 0; i < filter->nb_outputs; i++) {        if ((link = filter->outputs[i])) {            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);        }        av_freep(&link);    }     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);    av_free(filter);} /* process a list of value1:value2:..., each value corresponding * to subsequent AVOption, in the order they are declared */static int process_unnamed_options(AVFilterContext *ctx, AVDictionary **options,                                   const char *args){    const AVOption *o = NULL;    const char *p = args;    char *val;     while (*p) {        o = av_opt_next(ctx->priv, o);        if (!o) {            av_log(ctx, AV_LOG_ERROR, "More options provided than "                   "this filter supports.\n");            return AVERROR(EINVAL);        }        if (o->type == AV_OPT_TYPE_CONST)            continue;

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