Commit a532bb39 authored by Stefano Sabatini's avatar Stefano Sabatini
Browse files

Add setpts filter, ported from the libavfilter soc repo.

Originally committed as revision 25655 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 6f84cd12
......@@ -51,6 +51,7 @@ version <next>:
- ffmpeg -force_key_frames option added
- demuxer for receiving raw rtp:// URLs without an SDP description
- single stream LATM/LOAS decoder
- setpts filter added
version 0.6:
......
......@@ -502,6 +502,66 @@ settb=2*intb
settb=AVTB
@end example
@section setpts
Change the PTS (presentation timestamp) of the input video frames.
Accept in input an expression evaluated through the eval API, which
can contain the following constants:
@table @option
@item PTS
the presentation timestamp in input
@item PI
Greek PI
@item PHI
golden ratio
@item E
Euler number
@item N
the count of the input frame, starting from 0.
@item STARTPTS
the PTS of the first video frame
@item INTERLACED
tell if the current frame is interlaced
@item POS
original position in the file of the frame, or undefined if undefined
for the current frame
@item PREV_INPTS
previous input PTS
@item PREV_OUTPTS
previous output PTS
@end table
Some examples follow:
@example
# start counting PTS from zero
setpts=PTS-STARTPTS
# fast motion
setpts=0.5*PTS
# slow motion
setpts=2.0*PTS
# fixed rate 25 fps
setpts=N/(25*TB)
# fixed rate 25 fps with some jitter
setpts='1/(25*TB) * (N + 0.05 * sin(N*2*PI/25))'
@end example
@section slicify
Pass the images of input video on to next video filter as multiple
......
......@@ -37,6 +37,7 @@ OBJS-$(CONFIG_PIXDESCTEST_FILTER) += vf_pixdesctest.o
OBJS-$(CONFIG_PIXELASPECT_FILTER) += vf_aspect.o
OBJS-$(CONFIG_SCALE_FILTER) += vf_scale.o
OBJS-$(CONFIG_SETTB_FILTER) += vf_settb.o
OBJS-$(CONFIG_SETPTS_FILTER) += vf_setpts.o
OBJS-$(CONFIG_SLICIFY_FILTER) += vf_slicify.o
OBJS-$(CONFIG_TRANSPOSE_FILTER) += vf_transpose.o
OBJS-$(CONFIG_UNSHARP_FILTER) += vf_unsharp.o
......
......@@ -57,6 +57,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (PIXELASPECT, pixelaspect, vf);
REGISTER_FILTER (SCALE, scale, vf);
REGISTER_FILTER (SETTB, settb, vf);
REGISTER_FILTER (SETPTS, setpts, vf);
REGISTER_FILTER (SLICIFY, slicify, vf);
REGISTER_FILTER (TRANSPOSE, transpose, vf);
REGISTER_FILTER (UNSHARP, unsharp, vf);
......
......@@ -25,7 +25,7 @@
#include "libavutil/avutil.h"
#define LIBAVFILTER_VERSION_MAJOR 1
#define LIBAVFILTER_VERSION_MINOR 53
#define LIBAVFILTER_VERSION_MINOR 54
#define LIBAVFILTER_VERSION_MICRO 0
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
......
/*
* 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_parse_expr(&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_eval_expr(setpts->expr, setpts->var_values, NULL);
outpicref->pts = D2TS(d);
#ifdef DEBUG
av_log(inlink->dst, AV_LOG_DEBUG,
"n:%"PRId64" interlaced:%d pos:%d pts:%"PRId64" t:%f -> pts:%"PRId64" t:%f\n",
(int64_t)setpts->var_values[VAR_N],
(int)setpts->var_values[VAR_INTERLACED],
(int)setpts->var_values[VAR_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_free_expr(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}},
};
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