/* * Filter graphs to bad ASCII-art * Copyright (c) 2012 Nicolas George * * 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 <string.h> #include "libavutil/channel_layout.h"#include "libavutil/bprint.h"#include "libavutil/pixdesc.h"#include "avfilter.h"#include "avfiltergraph.h" static int print_link_prop(AVBPrint *buf, AVFilterLink *link){    char *format;    char layout[64];     if (!buf)        buf = &(AVBPrint){ 0 }; /* dummy buffer */    switch (link->type) {        case AVMEDIA_TYPE_VIDEO:            format = av_x_if_null(av_get_pix_fmt_name(link->format), "?");            av_bprintf(buf, "[%dx%d %d:%d %s]", link->w, link->h,                    link->sample_aspect_ratio.num,                    link->sample_aspect_ratio.den,                    format);            break;         case AVMEDIA_TYPE_AUDIO:            av_get_channel_layout_string(layout, sizeof(layout),                                         link->channels, link->channel_layout);            format = av_x_if_null(av_get_sample_fmt_name(link->format), "?");            av_bprintf(buf, "[%dHz %s:%s]",                       (int)link->sample_rate, format, layout);            break;         default:            av_bprintf(buf, "?");            break;    }    return buf->len;} static void avfilter_graph_dump_to_buf(AVBPrint *buf, AVFilterGraph *graph){    unsigned i, j, x, e;     for (i = 0; i < graph->nb_filters; i++) {        AVFilterContext *filter = graph->filters[i];        unsigned max_src_name = 0, max_dst_name = 0;        unsigned max_in_name  = 0, max_out_name = 0;        unsigned max_in_fmt   = 0, max_out_fmt  = 0;        unsigned width, height, in_indent;        unsigned lname = strlen(filter->name);        unsigned ltype = strlen(filter->filter->name);         for (j = 0; j < filter->input_count; j++) {            AVFilterLink *l = filter->inputs[j];            unsigned ln = strlen(l->src->name) + 1 + strlen(l->srcpad->name);            max_src_name = FFMAX(max_src_name, ln);            max_in_name = FFMAX(max_in_name, strlen(l->dstpad->name));            max_in_fmt = FFMAX(max_in_fmt, print_link_prop(NULL, l));        }        for (j = 0; j < filter->output_count; j++) {            AVFilterLink *l = filter->outputs[j];            unsigned ln = strlen(l->dst->name) + 1 + strlen(l->dstpad->name);            max_dst_name = FFMAX(max_dst_name, ln);            max_out_name = FFMAX(max_out_name, strlen(l->srcpad->name));            max_out_fmt = FFMAX(max_out_fmt, print_link_prop(NULL, l));        }        in_indent = max_src_name + max_in_name + max_in_fmt;        in_indent += in_indent ? 4 : 0;        width = FFMAX(lname + 2, ltype + 4);        height = FFMAX3(2, filter->input_count, filter->output_count);        av_bprint_chars(buf, ' ', in_indent);        av_bprintf(buf, "+");        av_bprint_chars(buf, '-', width);        av_bprintf(buf, "+\n");        for (j = 0; j < height; j++) {            unsigned in_no  = j - (height - filter->input_count ) / 2;            unsigned out_no = j - (height - filter->output_count) / 2;             /* Input link */            if (in_no < filter->input_count) {                AVFilterLink *l = filter->inputs[in_no];                e = buf->len + max_src_name + 2;                av_bprintf(buf, "%s:%s", l->src->name, l->srcpad->name);                av_bprint_chars(buf, '-', e - buf->len);                e = buf->len + max_in_fmt + 2 +                    max_in_name - strlen(l->dstpad->name);                print_link_prop(buf, l);                av_bprint_chars(buf, '-', e - buf->len);                av_bprintf(buf, "%s", l->dstpad->name);            } else {                av_bprint_chars(buf, ' ', in_indent);            }             /* Filter */            av_bprintf(buf, "|");            if (j == (height - 2) / 2) {                x = (width - lname) / 2;                av_bprintf(buf, "%*s%-*s", x, "", width - x, filter->name);            } else if (j == (height - 2) / 2 + 1) {                x = (width - ltype - 2) / 2;                av_bprintf(buf, "%*s(%s)%*s", x, "", filter->filter->name,                        width - ltype - 2 - x, "");            } else {                av_bprint_chars(buf, ' ', width);            }            av_bprintf(buf, "|");             /* Output link */            if (out_no < filter->output_count) {                AVFilterLink *l = filter->outputs[out_no];                unsigned ln = strlen(l->dst->name) + 1 +                              strlen(l->dstpad->name);                e = buf->len + max_out_name + 2;                av_bprintf(buf, "%s", l->srcpad->name);                av_bprint_chars(buf, '-', e - buf->len);                e = buf->len + max_out_fmt + 2 +                    max_dst_name - ln;                print_link_prop(buf, l);                av_bprint_chars(buf, '-', e - buf->len);                av_bprintf(buf, "%s:%s", l->dst->name, l->dstpad->name);            }            av_bprintf(buf, "\n");        }        av_bprint_chars(buf, ' ', in_indent);        av_bprintf(buf, "+");        av_bprint_chars(buf, '-', width);        av_bprintf(buf, "+\n");        av_bprintf(buf, "\n");    }} char *avfilter_graph_dump(AVFilterGraph *graph, const char *options){    AVBPrint buf;    char *dump;     av_bprint_init(&buf, 0, 0);    avfilter_graph_dump_to_buf(&buf, graph);    av_bprint_init(&buf, buf.len + 1, buf.len + 1);    avfilter_graph_dump_to_buf(&buf, graph);    av_bprint_finalize(&buf, &dump);    return dump;}