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https://github.com/FFmpeg/FFmpeg.git
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976a8b2179
* qatar/master: (40 commits) H.264: template left MB handling H.264: faster fill_decode_caches H.264: faster write_back_* H.264: faster fill_filter_caches H.264: make filter_mb_fast support the case of unavailable top mb Do not include log.h in avutil.h Do not include pixfmt.h in avutil.h Do not include rational.h in avutil.h Do not include mathematics.h in avutil.h Do not include intfloat_readwrite.h in avutil.h Remove return statements following infinite loops without break RTSP: Doxygen comment cleanup doxygen: Escape '\' in Doxygen documentation. md5: cosmetics md5: use AV_WL32 to write result md5: add fate test md5: include correct headers md5: fix test program doxygen: Drop array size declarations from Doxygen parameter names. doxygen: Fix parameter names to match the function prototypes. ... Conflicts: libavcodec/x86/dsputil_mmx.c libavformat/flvenc.c libavformat/oggenc.c libavformat/wtv.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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static const char *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, void *opaque)
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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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