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ffmpeg/libavfilter/setpts.c
Andreas Rheinhardt 2f62a433f2 avfilter: Deduplicate default video inputs/outputs 
Lots of video filters use a very simple input or output:
An array with a single AVFilterPad whose name is "default"
and whose type is AVMEDIA_TYPE_VIDEO; everything else is unset.

Given that we never use pointer equality for inputs or outputs*,
we can simply use a single AVFilterPad instead of dozens; this
even saves .data.rel.ro (8312B here) as well as relocations.

*: In fact, several filters (like the filters in vf_lut.c)
already use the same outputs; furthermore, ff_filter_alloc()
duplicates the input and output pads so that we do not even
work with the pads directly.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2023-08-07 09:21:13 +02:00

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/*
* 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
*/
#include "config_components.h"
#include <inttypes.h>
#include "libavutil/eval.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "internal.h"
#include "video.h"
static const char *const var_names[] = {
"FRAME_RATE", ///< defined only for constant frame-rate video
"INTERLACED", ///< tell if the current frame is interlaced
"N", ///< frame / sample number (starting at zero)
"NB_CONSUMED_SAMPLES", ///< number of samples consumed by the filter (only audio)
"NB_SAMPLES", ///< number of samples in the current frame (only audio)
#if FF_API_FRAME_PKT
"POS", ///< original position in the file of the frame
#endif
"PREV_INPTS", ///< previous input PTS
"PREV_INT", ///< previous input time in seconds
"PREV_OUTPTS", ///< previous output PTS
"PREV_OUTT", ///< previous output time in seconds
"PTS", ///< original pts in the file of the frame
"SAMPLE_RATE", ///< sample rate (only audio)
"STARTPTS", ///< PTS at start of movie
"STARTT", ///< time at start of movie
"T", ///< original time in the file of the frame
"TB", ///< timebase
"RTCTIME", ///< wallclock (RTC) time in micro seconds
"RTCSTART", ///< wallclock (RTC) time at the start of the movie in micro seconds
"S", // Number of samples in the current frame
"SR", // Audio sample rate
"FR", ///< defined only for constant frame-rate video
"T_CHANGE", ///< time of first frame after latest command was applied
NULL
};
enum var_name {
VAR_FRAME_RATE,
VAR_INTERLACED,
VAR_N,
VAR_NB_CONSUMED_SAMPLES,
VAR_NB_SAMPLES,
#if FF_API_FRAME_PKT
VAR_POS,
#endif
VAR_PREV_INPTS,
VAR_PREV_INT,
VAR_PREV_OUTPTS,
VAR_PREV_OUTT,
VAR_PTS,
VAR_SAMPLE_RATE,
VAR_STARTPTS,
VAR_STARTT,
VAR_T,
VAR_TB,
VAR_RTCTIME,
VAR_RTCSTART,
VAR_S,
VAR_SR,
VAR_FR,
VAR_T_CHANGE,
VAR_VARS_NB,
};
typedef struct SetPTSContext {
const AVClass *class;
char *expr_str;
AVExpr *expr;
double var_values[VAR_VARS_NB];
enum AVMediaType type;
} SetPTSContext;
static av_cold int init(AVFilterContext *ctx)
{
SetPTSContext *setpts = ctx->priv;
int ret;
if ((ret = av_expr_parse(&setpts->expr, setpts->expr_str,
var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", setpts->expr_str);
return ret;
}
setpts->var_values[VAR_N] = 0.0;
setpts->var_values[VAR_S] = 0.0;
setpts->var_values[VAR_PREV_INPTS] = NAN;
setpts->var_values[VAR_PREV_INT] = NAN;
setpts->var_values[VAR_PREV_OUTPTS] = NAN;
setpts->var_values[VAR_PREV_OUTT] = NAN;
setpts->var_values[VAR_STARTPTS] = NAN;
setpts->var_values[VAR_STARTT] = NAN;
setpts->var_values[VAR_T_CHANGE] = NAN;
return 0;
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
SetPTSContext *setpts = ctx->priv;
setpts->type = inlink->type;
setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
setpts->var_values[VAR_RTCSTART] = av_gettime();
setpts->var_values[VAR_SR] =
setpts->var_values[VAR_SAMPLE_RATE] =
setpts->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
setpts->var_values[VAR_FRAME_RATE] =
setpts->var_values[VAR_FR] = inlink->frame_rate.num &&
inlink->frame_rate.den ?
av_q2d(inlink->frame_rate) : NAN;
av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f FRAME_RATE:%f SAMPLE_RATE:%f\n",
setpts->var_values[VAR_TB],
setpts->var_values[VAR_FRAME_RATE],
setpts->var_values[VAR_SAMPLE_RATE]);
return 0;
}
#define BUF_SIZE 64
static inline char *double2int64str(char *buf, double v)
{
if (isnan(v)) snprintf(buf, BUF_SIZE, "nan");
else snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)v);
return buf;
}
static double eval_pts(SetPTSContext *setpts, AVFilterLink *inlink, AVFrame *frame, int64_t pts)
{
if (isnan(setpts->var_values[VAR_STARTPTS])) {
setpts->var_values[VAR_STARTPTS] = TS2D(pts);
setpts->var_values[VAR_STARTT ] = TS2T(pts, inlink->time_base);
}
if (isnan(setpts->var_values[VAR_T_CHANGE])) {
setpts->var_values[VAR_T_CHANGE] = TS2T(pts, inlink->time_base);
}
setpts->var_values[VAR_PTS ] = TS2D(pts);
setpts->var_values[VAR_T ] = TS2T(pts, inlink->time_base);
#if FF_API_FRAME_PKT
FF_DISABLE_DEPRECATION_WARNINGS
setpts->var_values[VAR_POS ] = !frame || frame->pkt_pos == -1 ? NAN : frame->pkt_pos;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
setpts->var_values[VAR_RTCTIME ] = av_gettime();
if (frame) {
if (inlink->type == AVMEDIA_TYPE_VIDEO) {
setpts->var_values[VAR_INTERLACED] = !!(frame->flags & AV_FRAME_FLAG_INTERLACED);
} else if (inlink->type == AVMEDIA_TYPE_AUDIO) {
setpts->var_values[VAR_S] = frame->nb_samples;
setpts->var_values[VAR_NB_SAMPLES] = frame->nb_samples;
}
}
return av_expr_eval(setpts->expr, setpts->var_values, NULL);
}
#define d2istr(v) double2int64str((char[BUF_SIZE]){0}, v)
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
SetPTSContext *setpts = inlink->dst->priv;
int64_t in_pts = frame->pts;
double d;
d = eval_pts(setpts, inlink, frame, frame->pts);
frame->pts = D2TS(d);
av_log(inlink->dst, AV_LOG_TRACE,
"N:%"PRId64" PTS:%s T:%f",
(int64_t)setpts->var_values[VAR_N],
d2istr(setpts->var_values[VAR_PTS]),
setpts->var_values[VAR_T]);
switch (inlink->type) {
case AVMEDIA_TYPE_VIDEO:
av_log(inlink->dst, AV_LOG_TRACE, " INTERLACED:%"PRId64,
(int64_t)setpts->var_values[VAR_INTERLACED]);
break;
case AVMEDIA_TYPE_AUDIO:
av_log(inlink->dst, AV_LOG_TRACE, " NB_SAMPLES:%"PRId64" NB_CONSUMED_SAMPLES:%"PRId64,
(int64_t)setpts->var_values[VAR_NB_SAMPLES],
(int64_t)setpts->var_values[VAR_NB_CONSUMED_SAMPLES]);
break;
}
av_log(inlink->dst, AV_LOG_TRACE, " -> PTS:%s T:%f\n", d2istr(d), TS2T(d, inlink->time_base));
if (inlink->type == AVMEDIA_TYPE_VIDEO) {
setpts->var_values[VAR_N] += 1.0;
} else {
setpts->var_values[VAR_N] += frame->nb_samples;
}
setpts->var_values[VAR_PREV_INPTS ] = TS2D(in_pts);
setpts->var_values[VAR_PREV_INT ] = TS2T(in_pts, inlink->time_base);
setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
setpts->var_values[VAR_PREV_OUTT] = TS2T(frame->pts, inlink->time_base);
if (setpts->type == AVMEDIA_TYPE_AUDIO) {
setpts->var_values[VAR_NB_CONSUMED_SAMPLES] += frame->nb_samples;
}
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
static int activate(AVFilterContext *ctx)
{
SetPTSContext *setpts = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *in;
int status;
int64_t pts;
int ret;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
ret = ff_inlink_consume_frame(inlink, &in);
if (ret < 0)
return ret;
if (ret > 0)
return filter_frame(inlink, in);
if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
double d = eval_pts(setpts, inlink, NULL, pts);
av_log(ctx, AV_LOG_TRACE, "N:EOF PTS:%s T:%f -> PTS:%s T:%f\n",
d2istr(setpts->var_values[VAR_PTS]),
setpts->var_values[VAR_T],
d2istr(d), TS2T(d, inlink->time_base));
ff_outlink_set_status(outlink, status, D2TS(d));
return 0;
}
FF_FILTER_FORWARD_WANTED(outlink, inlink);
return FFERROR_NOT_READY;
}
static av_cold void uninit(AVFilterContext *ctx)
{
SetPTSContext *setpts = ctx->priv;
av_expr_free(setpts->expr);
setpts->expr = NULL;
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *arg,
char *res, int res_len, int flags)
{
SetPTSContext *setpts = ctx->priv;
AVExpr *new_expr;
int ret;
ret = ff_filter_process_command(ctx, cmd, arg, res, res_len, flags);
if (ret < 0)
return ret;
if (!strcmp(cmd, "expr")) {
ret = av_expr_parse(&new_expr, arg, var_names, NULL, NULL, NULL, NULL, 0, ctx);
// Only free and replace previous expression if new one succeeds,
// otherwise defensively keep everything intact even if reporting an error.
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", arg);
} else {
av_expr_free(setpts->expr);
setpts->expr = new_expr;
setpts->var_values[VAR_T_CHANGE] = NAN;
}
} else {
ret = AVERROR(EINVAL);
}
return ret;
}
#define OFFSET(x) offsetof(SetPTSContext, x)
#define V AV_OPT_FLAG_VIDEO_PARAM
#define A AV_OPT_FLAG_AUDIO_PARAM
#define R AV_OPT_FLAG_RUNTIME_PARAM
#define F AV_OPT_FLAG_FILTERING_PARAM
#if CONFIG_SETPTS_FILTER
static const AVOption setpts_options[] = {
{ "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = V|F|R },
{ NULL }
};
AVFILTER_DEFINE_CLASS(setpts);
static const AVFilterPad avfilter_vf_setpts_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
},
};
const AVFilter ff_vf_setpts = {
.name = "setpts",
.description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
.init = init,
.activate = activate,
.uninit = uninit,
.process_command = process_command,
.flags = AVFILTER_FLAG_METADATA_ONLY,
.priv_size = sizeof(SetPTSContext),
.priv_class = &setpts_class,
FILTER_INPUTS(avfilter_vf_setpts_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
};
#endif /* CONFIG_SETPTS_FILTER */
#if CONFIG_ASETPTS_FILTER
static const AVOption asetpts_options[] = {
{ "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = A|F|R },
{ NULL }
};
AVFILTER_DEFINE_CLASS(asetpts);
static const AVFilterPad asetpts_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_input,
},
};
const AVFilter ff_af_asetpts = {
.name = "asetpts",
.description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),
.init = init,
.activate = activate,
.uninit = uninit,
.process_command = process_command,
.priv_size = sizeof(SetPTSContext),
.priv_class = &asetpts_class,
.flags = AVFILTER_FLAG_METADATA_ONLY,
FILTER_INPUTS(asetpts_inputs),
FILTER_OUTPUTS(ff_audio_default_filterpad),
};
#endif /* CONFIG_ASETPTS_FILTER */
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