/* * 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 <ctype.h>#include <string.h> #include "libavutil/audioconvert.h"#include "avfilter.h"#include "avfiltergraph.h"#include "internal.h" AVFilterGraph *avfilter_graph_alloc(void){    return av_mallocz(sizeof(AVFilterGraph));} void avfilter_graph_free(AVFilterGraph **graph){    if (!*graph)        return;    for (; (*graph)->filter_count > 0; (*graph)->filter_count--)        avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);    av_freep(&(*graph)->scale_sws_opts);    av_freep(&(*graph)->filters);    av_freep(graph);} int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter){    AVFilterContext **filters = av_realloc(graph->filters,                                           sizeof(AVFilterContext*) * (graph->filter_count+1));    if (!filters)        return AVERROR(ENOMEM);     graph->filters = filters;    graph->filters[graph->filter_count++] = filter;     return 0;} int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,                                 const char *name, const char *args, void *opaque,                                 AVFilterGraph *graph_ctx){    int ret;     if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)        goto fail;    if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)        goto fail;    if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)        goto fail;    return 0; fail:    if (*filt_ctx)        avfilter_free(*filt_ctx);    *filt_ctx = NULL;    return ret;} int ff_avfilter_graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx){    AVFilterContext *filt;    int i, j;     for (i = 0; i < graph->filter_count; i++) {        filt = graph->filters[i];         for (j = 0; j < filt->input_count; j++) {            if (!filt->inputs[j] || !filt->inputs[j]->src) {                av_log(log_ctx, AV_LOG_ERROR,                       "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",                       filt->input_pads[j].name, filt->name, filt->filter->name);                return AVERROR(EINVAL);            }        }         for (j = 0; j < filt->output_count; j++) {            if (!filt->outputs[j] || !filt->outputs[j]->dst) {                av_log(log_ctx, AV_LOG_ERROR,                       "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",                       filt->output_pads[j].name, filt->name, filt->filter->name);                return AVERROR(EINVAL);            }        }    }     return 0;} int ff_avfilter_graph_config_links(AVFilterGraph *graph, AVClass *log_ctx){    AVFilterContext *filt;    int i, ret;     for (i=0; i < graph->filter_count; i++) {        filt = graph->filters[i];         if (!filt->output_count) {            if ((ret = avfilter_config_links(filt)))                return ret;        }    }     return 0;} AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name){    int i;     for (i = 0; i < graph->filter_count; i++)        if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))            return graph->filters[i];     return NULL;} static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,                              const char *filt_name, const char *filt_args){    static int auto_count = 0, ret;    char inst_name[32];    AVFilterContext *filt_ctx;     snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",            filt_name, auto_count++);     if ((ret = avfilter_graph_create_filter(&filt_ctx,                                            avfilter_get_by_name(filt_name),                                            inst_name, filt_args, NULL, graph)) < 0)        return ret;    if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)        return ret;     filt_ctx->filter->query_formats(filt_ctx);     if ( ((link = filt_ctx-> inputs[0]) &&           !avfilter_merge_formats(link->in_formats, link->out_formats)) ||         ((link = filt_ctx->outputs[0]) &&           !avfilter_merge_formats(link->in_formats, link->out_formats))       ) {        av_log(NULL, AV_LOG_ERROR,               "Impossible to convert between the formats supported by the filter "               "'%s' and the filter '%s'\n", link->src->name, link->dst->name);        return AVERROR(EINVAL);    }     if (link->type == AVMEDIA_TYPE_AUDIO &&         (((link = filt_ctx-> inputs[0]) &&           (!avfilter_merge_formats(link->in_chlayouts, link->out_chlayouts) ||            !avfilter_merge_formats(link->in_packing,   link->out_packing))) ||         ((link = filt_ctx->outputs[0]) &&           (!avfilter_merge_formats(link->in_chlayouts, link->out_chlayouts) ||            !avfilter_merge_formats(link->in_packing,   link->out_packing))))       ) {        av_log(NULL, AV_LOG_ERROR,               "Impossible to convert between the channel layouts/packing formats supported by the filter "               "'%s' and the filter '%s'\n", link->src->name, link->dst->name);        return AVERROR(EINVAL);    }     return 0;} static int query_formats(AVFilterGraph *graph, AVClass *log_ctx){    int i, j, ret;    char filt_args[128];    AVFilterFormats *formats, *chlayouts, *packing;     /* ask all the sub-filters for their supported media formats */    for (i = 0; i < graph->filter_count; i++) {        if (graph->filters[i]->filter->query_formats)            graph->filters[i]->filter->query_formats(graph->filters[i]);        else            avfilter_default_query_formats(graph->filters[i]);    }     /* go through and merge as many format lists as possible */    for (i = 0; i < graph->filter_count; i++) {        AVFilterContext *filter = graph->filters[i];         for (j = 0; j < filter->input_count; j++) {            AVFilterLink *link = filter->inputs[j];            if (!link) continue;             if (!link->in_formats || !link->out_formats)                return AVERROR(EINVAL);             if (link->type == AVMEDIA_TYPE_VIDEO &&                !avfilter_merge_formats(link->in_formats, link->out_formats)) {                 /* couldn't merge format lists, auto-insert scale filter */                snprintf(filt_args, sizeof(filt_args), "0:0:%s",                         graph->scale_sws_opts);                if (ret = insert_conv_filter(graph, link, "scale", filt_args))                    return ret;            }            else if (link->type == AVMEDIA_TYPE_AUDIO) {                if (!link->in_chlayouts || !link->out_chlayouts ||                    !link->in_packing   || !link->out_packing)                    return AVERROR(EINVAL);                 /* Merge all three list before checking: that way, in all                 * three categories, aconvert will use a common format                 * whenever possible. */                formats   = avfilter_merge_formats(link->in_formats,   link->out_formats);                chlayouts = avfilter_merge_formats(link->in_chlayouts, link->out_chlayouts);                packing   = avfilter_merge_formats(link->in_packing,   link->out_packing);                if (!formats || !chlayouts || !packing)                    if (ret = insert_conv_filter(graph, link, "aconvert", NULL))                       return ret;            }        }    }     return 0;} static void pick_format(AVFilterLink *link){    if (!link || !link->in_formats)        return;     link->in_formats->format_count = 1;    link->format = link->in_formats->formats[0];    avfilter_formats_unref(&link->in_formats);    avfilter_formats_unref(&link->out_formats);     if (link->type == AVMEDIA_TYPE_AUDIO) {        link->in_chlayouts->format_count = 1;        link->channel_layout = link->in_chlayouts->formats[0];        avfilter_formats_unref(&link->in_chlayouts);        avfilter_formats_unref(&link->out_chlayouts);         link->in_packing->format_count = 1;        link->planar = link->in_packing->formats[0] == AVFILTER_PLANAR;        avfilter_formats_unref(&link->in_packing);        avfilter_formats_unref(&link->out_packing);    }} static void pick_formats(AVFilterGraph *graph){    int i, j;     for (i = 0; i < graph->filter_count; i++) {        AVFilterContext *filter = graph->filters[i];         for (j = 0; j < filter->input_count; j++)            pick_format(filter->inputs[j]);        for (j = 0; j < filter->output_count; j++)            pick_format(filter->outputs[j]);    }} int ff_avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx){    int ret;     /* find supported formats from sub-filters, and merge along links */    if ((ret = query_formats(graph, log_ctx)) < 0)        return ret;     /* Once everything is merged, it's possible that we'll still have     * multiple valid media format choices. We pick the first one. */    pick_formats(graph);     return 0;} int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx){    int ret;     if ((ret = ff_avfilter_graph_check_validity(graphctx, log_ctx)))        return ret;    if ((ret = ff_avfilter_graph_config_formats(graphctx, log_ctx)))        return ret;    if ((ret = ff_avfilter_graph_config_links(graphctx, log_ctx)))        return ret;     return 0;} 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->filter_count; 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->filter_count; i++) {        AVFilterContext *filter = graph->filters[i];        if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){            AVFilterCommand **que = &filter->command_queue, *next;            while(*que && (*que)->time <= ts)                que = &(*que)->next;            next= *que;            *que= av_mallocz(sizeof(AVFilterCommand));            (*que)->command = av_strdup(command);            (*que)->arg     = av_strdup(arg);            (*que)->time    = ts;            (*que)->flags   = flags;            (*que)->next    = next;            if(flags & AVFILTER_CMD_FLAG_ONE)                return 0;        }    }     return 0;}