a5e8c41c28
It is not used in any filters currently and is inherently evil. If passing binary data to filters is required in the future, it should be done with some AVOptions-based system.
133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* null video source
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/eval.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/parseutils.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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static const char *const var_names[] = {
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"E",
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"PHI",
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"PI",
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"AVTB", /* default timebase 1/AV_TIME_BASE */
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NULL
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};
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enum var_name {
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VAR_E,
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VAR_PHI,
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VAR_PI,
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VAR_AVTB,
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VAR_VARS_NB
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};
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typedef struct {
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int w, h;
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char tb_expr[256];
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double var_values[VAR_VARS_NB];
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} NullContext;
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static int init(AVFilterContext *ctx, const char *args)
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{
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NullContext *priv = ctx->priv;
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priv->w = 352;
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priv->h = 288;
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av_strlcpy(priv->tb_expr, "AVTB", sizeof(priv->tb_expr));
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if (args)
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sscanf(args, "%d:%d:%255[^:]", &priv->w, &priv->h, priv->tb_expr);
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if (priv->w <= 0 || priv->h <= 0) {
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av_log(ctx, AV_LOG_ERROR, "Non-positive size values are not acceptable.\n");
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return AVERROR(EINVAL);
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}
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return 0;
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}
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static int config_props(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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NullContext *priv = ctx->priv;
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AVRational tb;
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int ret;
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double res;
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priv->var_values[VAR_E] = M_E;
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priv->var_values[VAR_PHI] = M_PHI;
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priv->var_values[VAR_PI] = M_PI;
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priv->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q);
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if ((ret = av_expr_parse_and_eval(&res, priv->tb_expr, var_names, priv->var_values,
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NULL, NULL, NULL, NULL, NULL, 0, NULL)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid expression '%s' for timebase.\n", priv->tb_expr);
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return ret;
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}
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tb = av_d2q(res, INT_MAX);
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if (tb.num <= 0 || tb.den <= 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid non-positive value for the timebase %d/%d.\n",
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tb.num, tb.den);
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return AVERROR(EINVAL);
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}
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outlink->w = priv->w;
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outlink->h = priv->h;
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outlink->time_base = tb;
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av_log(outlink->src, AV_LOG_INFO, "w:%d h:%d tb:%d/%d\n", priv->w, priv->h,
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tb.num, tb.den);
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return 0;
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}
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static int request_frame(AVFilterLink *link)
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{
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return -1;
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}
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AVFilter avfilter_vsrc_nullsrc = {
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.name = "nullsrc",
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.description = NULL_IF_CONFIG_SMALL("Null video source, never return images."),
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.init = init,
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.priv_size = sizeof(NullContext),
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.inputs = (AVFilterPad[]) {{ .name = NULL}},
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.outputs = (AVFilterPad[]) {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_props,
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.request_frame = request_frame,
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},
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{ .name = NULL}
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},
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};
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