mirror of https://git.ffmpeg.org/ffmpeg.git
155 lines
5.0 KiB
C
155 lines
5.0 KiB
C
/*
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* Copyright (c) 2010 Stefano Sabatini
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* Copyright (c) 2008 Victor Paesa
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*
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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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* video presentation timestamp (PTS) modification filter
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*/
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/* #define DEBUG */
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#include "libavutil/eval.h"
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#include "libavutil/mathematics.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "video.h"
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static const char *const var_names[] = {
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"INTERLACED", ///< tell if the current frame is interlaced
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"N", ///< frame number (starting at zero)
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"POS", ///< original position in the file of the frame
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"PREV_INPTS", ///< previous input PTS
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"PREV_OUTPTS", ///< previous output PTS
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"PTS", ///< original pts in the file of the frame
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"STARTPTS", ///< PTS at start of movie
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"TB", ///< timebase
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NULL
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};
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enum var_name {
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VAR_INTERLACED,
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VAR_N,
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VAR_POS,
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VAR_PREV_INPTS,
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VAR_PREV_OUTPTS,
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VAR_PTS,
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VAR_STARTPTS,
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VAR_TB,
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VAR_VARS_NB
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};
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typedef struct {
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AVExpr *expr;
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double var_values[VAR_VARS_NB];
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} SetPTSContext;
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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SetPTSContext *setpts = ctx->priv;
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int ret;
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if ((ret = av_expr_parse(&setpts->expr, args ? args : "PTS",
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var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", args);
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return ret;
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}
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setpts->var_values[VAR_N ] = 0.0;
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setpts->var_values[VAR_PREV_INPTS ] = NAN;
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setpts->var_values[VAR_PREV_OUTPTS] = NAN;
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setpts->var_values[VAR_STARTPTS ] = NAN;
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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SetPTSContext *setpts = inlink->dst->priv;
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setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
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av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f\n", setpts->var_values[VAR_TB]);
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return 0;
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}
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#define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
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#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
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static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
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{
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SetPTSContext *setpts = inlink->dst->priv;
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double d;
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AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
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if (!outpicref)
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return AVERROR(ENOMEM);
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if (isnan(setpts->var_values[VAR_STARTPTS]))
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setpts->var_values[VAR_STARTPTS] = TS2D(inpicref->pts);
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setpts->var_values[VAR_INTERLACED] = inpicref->video->interlaced;
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setpts->var_values[VAR_PTS ] = TS2D(inpicref->pts);
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setpts->var_values[VAR_POS ] = inpicref->pos == -1 ? NAN : inpicref->pos;
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d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
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outpicref->pts = D2TS(d);
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#ifdef DEBUG
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av_log(inlink->dst, AV_LOG_DEBUG,
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"n:%"PRId64" interlaced:%d pos:%"PRId64" pts:%"PRId64" t:%f -> pts:%"PRId64" t:%f\n",
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(int64_t)setpts->var_values[VAR_N],
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(int)setpts->var_values[VAR_INTERLACED],
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inpicref ->pos,
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inpicref ->pts, inpicref ->pts * av_q2d(inlink->time_base),
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outpicref->pts, outpicref->pts * av_q2d(inlink->time_base));
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#endif
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setpts->var_values[VAR_N] += 1.0;
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setpts->var_values[VAR_PREV_INPTS ] = TS2D(inpicref ->pts);
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setpts->var_values[VAR_PREV_OUTPTS] = TS2D(outpicref->pts);
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return ff_start_frame(inlink->dst->outputs[0], outpicref);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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SetPTSContext *setpts = ctx->priv;
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av_expr_free(setpts->expr);
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setpts->expr = NULL;
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}
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AVFilter avfilter_vf_setpts = {
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.name = "setpts",
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.description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
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.init = init,
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.uninit = uninit,
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.priv_size = sizeof(SetPTSContext),
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.inputs = (const AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = ff_null_get_video_buffer,
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.config_props = config_input,
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.start_frame = start_frame, },
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{ .name = NULL }},
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.outputs = (const AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO, },
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{ .name = NULL}},
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};
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