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Add setpts filter, ported from the libavfilter soc repo.
Originally committed as revision 25655 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini
parent
6f84cd1279
commit
a532bb390f
@ -51,6 +51,7 @@ version <next>:
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- ffmpeg -force_key_frames option added
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- demuxer for receiving raw rtp:// URLs without an SDP description
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- single stream LATM/LOAS decoder
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- setpts filter added
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version 0.6:
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@ -502,6 +502,66 @@ settb=2*intb
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settb=AVTB
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@end example
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@section setpts
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Change the PTS (presentation timestamp) of the input video frames.
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Accept in input an expression evaluated through the eval API, which
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can contain the following constants:
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@table @option
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@item PTS
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the presentation timestamp in input
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@item PI
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Greek PI
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@item PHI
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golden ratio
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@item E
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Euler number
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@item N
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the count of the input frame, starting from 0.
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@item STARTPTS
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the PTS of the first video frame
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@item INTERLACED
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tell if the current frame is interlaced
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@item POS
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original position in the file of the frame, or undefined if undefined
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for the current frame
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@item PREV_INPTS
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previous input PTS
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@item PREV_OUTPTS
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previous output PTS
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@end table
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Some examples follow:
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@example
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# start counting PTS from zero
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setpts=PTS-STARTPTS
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# fast motion
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setpts=0.5*PTS
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# slow motion
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setpts=2.0*PTS
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# fixed rate 25 fps
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setpts=N/(25*TB)
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# fixed rate 25 fps with some jitter
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setpts='1/(25*TB) * (N + 0.05 * sin(N*2*PI/25))'
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@end example
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@section slicify
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Pass the images of input video on to next video filter as multiple
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@ -37,6 +37,7 @@ OBJS-$(CONFIG_PIXDESCTEST_FILTER) += vf_pixdesctest.o
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OBJS-$(CONFIG_PIXELASPECT_FILTER) += vf_aspect.o
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OBJS-$(CONFIG_SCALE_FILTER) += vf_scale.o
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OBJS-$(CONFIG_SETTB_FILTER) += vf_settb.o
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OBJS-$(CONFIG_SETPTS_FILTER) += vf_setpts.o
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OBJS-$(CONFIG_SLICIFY_FILTER) += vf_slicify.o
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OBJS-$(CONFIG_TRANSPOSE_FILTER) += vf_transpose.o
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OBJS-$(CONFIG_UNSHARP_FILTER) += vf_unsharp.o
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@ -57,6 +57,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER (PIXELASPECT, pixelaspect, vf);
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REGISTER_FILTER (SCALE, scale, vf);
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REGISTER_FILTER (SETTB, settb, vf);
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REGISTER_FILTER (SETPTS, setpts, vf);
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REGISTER_FILTER (SLICIFY, slicify, vf);
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REGISTER_FILTER (TRANSPOSE, transpose, vf);
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REGISTER_FILTER (UNSHARP, unsharp, vf);
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@ -25,7 +25,7 @@
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#include "libavutil/avutil.h"
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#define LIBAVFILTER_VERSION_MAJOR 1
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#define LIBAVFILTER_VERSION_MINOR 53
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#define LIBAVFILTER_VERSION_MINOR 54
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#define LIBAVFILTER_VERSION_MICRO 0
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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157
libavfilter/vf_setpts.c
Normal file
157
libavfilter/vf_setpts.c
Normal file
@ -0,0 +1,157 @@
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/*
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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 "avfilter.h"
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static const char *var_names[] = {
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"E", ///< Euler number
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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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"PHI", ///< golden ratio
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"PI", ///< greek pi
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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_E,
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VAR_INTERLACED,
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VAR_N,
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VAR_PHI,
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VAR_PI,
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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, void *opaque)
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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_parse_expr(&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_E ] = M_E;
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setpts->var_values[VAR_N ] = 0.0;
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setpts->var_values[VAR_PHI ] = M_PHI;
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setpts->var_values[VAR_PI ] = M_PI;
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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_INFO, "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 void 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 (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_eval_expr(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:%d 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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(int)setpts->var_values[VAR_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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avfilter_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_free_expr(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 = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = avfilter_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 = (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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