mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-12-05 01:56:41 +00:00
2912e87a6c
Signed-off-by: Mans Rullgard <mans@mansr.com>
158 lines
5.1 KiB
C
158 lines
5.1 KiB
C
/*
|
|
* Copyright (c) 2010 Stefano Sabatini
|
|
* Copyright (c) 2008 Victor Paesa
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* video presentation timestamp (PTS) modification filter
|
|
*/
|
|
|
|
/* #define DEBUG */
|
|
|
|
#include "libavutil/eval.h"
|
|
#include "avfilter.h"
|
|
|
|
static const char *var_names[] = {
|
|
"E", ///< Euler number
|
|
"INTERLACED", ///< tell if the current frame is interlaced
|
|
"N", ///< frame number (starting at zero)
|
|
"PHI", ///< golden ratio
|
|
"PI", ///< greek pi
|
|
"POS", ///< original position in the file of the frame
|
|
"PREV_INPTS", ///< previous input PTS
|
|
"PREV_OUTPTS", ///< previous output PTS
|
|
"PTS", ///< original pts in the file of the frame
|
|
"STARTPTS", ///< PTS at start of movie
|
|
"TB", ///< timebase
|
|
NULL
|
|
};
|
|
|
|
enum var_name {
|
|
VAR_E,
|
|
VAR_INTERLACED,
|
|
VAR_N,
|
|
VAR_PHI,
|
|
VAR_PI,
|
|
VAR_POS,
|
|
VAR_PREV_INPTS,
|
|
VAR_PREV_OUTPTS,
|
|
VAR_PTS,
|
|
VAR_STARTPTS,
|
|
VAR_TB,
|
|
VAR_VARS_NB
|
|
};
|
|
|
|
typedef struct {
|
|
AVExpr *expr;
|
|
double var_values[VAR_VARS_NB];
|
|
} SetPTSContext;
|
|
|
|
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
|
|
{
|
|
SetPTSContext *setpts = ctx->priv;
|
|
int ret;
|
|
|
|
if ((ret = av_expr_parse(&setpts->expr, args ? args : "PTS",
|
|
var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
|
|
av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", args);
|
|
return ret;
|
|
}
|
|
|
|
setpts->var_values[VAR_E ] = M_E;
|
|
setpts->var_values[VAR_N ] = 0.0;
|
|
setpts->var_values[VAR_PHI ] = M_PHI;
|
|
setpts->var_values[VAR_PI ] = M_PI;
|
|
setpts->var_values[VAR_PREV_INPTS ] = NAN;
|
|
setpts->var_values[VAR_PREV_OUTPTS] = NAN;
|
|
setpts->var_values[VAR_STARTPTS ] = NAN;
|
|
return 0;
|
|
}
|
|
|
|
static int config_input(AVFilterLink *inlink)
|
|
{
|
|
SetPTSContext *setpts = inlink->dst->priv;
|
|
|
|
setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
|
|
|
|
av_log(inlink->src, AV_LOG_INFO, "TB:%f\n", setpts->var_values[VAR_TB]);
|
|
return 0;
|
|
}
|
|
|
|
#define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
|
|
#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
|
|
|
|
static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
|
|
{
|
|
SetPTSContext *setpts = inlink->dst->priv;
|
|
double d;
|
|
AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
|
|
|
|
if (isnan(setpts->var_values[VAR_STARTPTS]))
|
|
setpts->var_values[VAR_STARTPTS] = TS2D(inpicref->pts);
|
|
|
|
setpts->var_values[VAR_INTERLACED] = inpicref->video->interlaced;
|
|
setpts->var_values[VAR_PTS ] = TS2D(inpicref->pts);
|
|
setpts->var_values[VAR_POS ] = inpicref->pos == -1 ? NAN : inpicref->pos;
|
|
|
|
d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
|
|
outpicref->pts = D2TS(d);
|
|
|
|
#ifdef DEBUG
|
|
av_log(inlink->dst, AV_LOG_DEBUG,
|
|
"n:%"PRId64" interlaced:%d pos:%"PRId64" pts:%"PRId64" t:%f -> pts:%"PRId64" t:%f\n",
|
|
(int64_t)setpts->var_values[VAR_N],
|
|
(int)setpts->var_values[VAR_INTERLACED],
|
|
inpicref ->pos,
|
|
inpicref ->pts, inpicref ->pts * av_q2d(inlink->time_base),
|
|
outpicref->pts, outpicref->pts * av_q2d(inlink->time_base));
|
|
#endif
|
|
|
|
setpts->var_values[VAR_N] += 1.0;
|
|
setpts->var_values[VAR_PREV_INPTS ] = TS2D(inpicref ->pts);
|
|
setpts->var_values[VAR_PREV_OUTPTS] = TS2D(outpicref->pts);
|
|
avfilter_start_frame(inlink->dst->outputs[0], outpicref);
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
SetPTSContext *setpts = ctx->priv;
|
|
av_expr_free(setpts->expr);
|
|
setpts->expr = NULL;
|
|
}
|
|
|
|
AVFilter avfilter_vf_setpts = {
|
|
.name = "setpts",
|
|
.description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
|
|
.init = init,
|
|
.uninit = uninit,
|
|
|
|
.priv_size = sizeof(SetPTSContext),
|
|
|
|
.inputs = (AVFilterPad[]) {{ .name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.get_video_buffer = avfilter_null_get_video_buffer,
|
|
.config_props = config_input,
|
|
.start_frame = start_frame, },
|
|
{ .name = NULL }},
|
|
.outputs = (AVFilterPad[]) {{ .name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO, },
|
|
{ .name = NULL}},
|
|
};
|