mirror of https://git.ffmpeg.org/ffmpeg.git
268 lines
7.7 KiB
C
268 lines
7.7 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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#include <inttypes.h>
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#include "libavutil/eval.h"
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#include "libavutil/internal.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "libavutil/time.h"
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#include "audio.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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#include "config.h"
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static const char *const var_names[] = {
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"E", ///< Euler number
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"FRAME_RATE", ///< defined only for constant frame-rate video
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"INTERLACED", ///< tell if the current frame is interlaced
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"N", ///< frame / sample number (starting at zero)
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"PHI", ///< golden ratio
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"PI", ///< Greek pi
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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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"RTCTIME", ///< wallclock (RTC) time in micro seconds
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"RTCSTART", ///< wallclock (RTC) time at the start of the movie in micro seconds
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"S", // Number of samples in the current frame
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"SR", // Audio sample rate
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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_FRAME_RATE,
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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_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_RTCTIME,
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VAR_RTCSTART,
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VAR_S,
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VAR_SR,
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VAR_VARS_NB
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};
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typedef struct SetPTSContext {
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const AVClass *class;
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char *expr_str;
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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)
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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, setpts->expr_str,
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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", setpts->expr_str);
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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_S] = 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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setpts->var_values[VAR_RTCSTART] = av_gettime();
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if (inlink->type == AVMEDIA_TYPE_AUDIO) {
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setpts->var_values[VAR_SR] = inlink->sample_rate;
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}
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setpts->var_values[VAR_FRAME_RATE] = inlink->frame_rate.num &&
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inlink->frame_rate.den ?
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av_q2d(inlink->frame_rate) : NAN;
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// Indicate the output can be variable framerate.
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inlink->frame_rate = (AVRational){1, 0};
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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 filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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SetPTSContext *setpts = inlink->dst->priv;
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int64_t in_pts = frame->pts;
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double d;
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if (isnan(setpts->var_values[VAR_STARTPTS]))
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setpts->var_values[VAR_STARTPTS] = TS2D(frame->pts);
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setpts->var_values[VAR_PTS ] = TS2D(frame->pts);
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setpts->var_values[VAR_RTCTIME ] = av_gettime();
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if (inlink->type == AVMEDIA_TYPE_VIDEO) {
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setpts->var_values[VAR_INTERLACED] = frame->interlaced_frame;
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} else {
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setpts->var_values[VAR_S] = frame->nb_samples;
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}
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d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
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frame->pts = D2TS(d);
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av_log(inlink->dst, AV_LOG_TRACE,
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"n:%"PRId64" interlaced:%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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in_pts, in_pts * av_q2d(inlink->time_base),
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frame->pts, frame->pts * av_q2d(inlink->time_base));
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if (inlink->type == AVMEDIA_TYPE_VIDEO) {
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setpts->var_values[VAR_N] += 1.0;
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} else {
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setpts->var_values[VAR_N] += frame->nb_samples;
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}
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setpts->var_values[VAR_PREV_INPTS ] = TS2D(in_pts);
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setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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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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#define OFFSET(x) offsetof(SetPTSContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM
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static const AVOption options[] = {
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{ "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = FLAGS },
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{ NULL },
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};
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#if CONFIG_SETPTS_FILTER
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static const AVClass setpts_class = {
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.class_name = "setpts",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const AVFilterPad avfilter_vf_setpts_inputs[] = {
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{
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.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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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_vf_setpts_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_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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.priv_class = &setpts_class,
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.inputs = avfilter_vf_setpts_inputs,
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.outputs = avfilter_vf_setpts_outputs,
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};
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#endif
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#if CONFIG_ASETPTS_FILTER
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static const AVClass asetpts_class = {
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.class_name = "asetpts",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const AVFilterPad asetpts_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.get_audio_buffer = ff_null_get_audio_buffer,
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.config_props = config_input,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad asetpts_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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},
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{ NULL }
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};
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AVFilter ff_af_asetpts = {
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.name = "asetpts",
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.description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio 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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.priv_class = &asetpts_class,
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.inputs = asetpts_inputs,
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.outputs = asetpts_outputs,
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};
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#endif
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