mirror of https://git.ffmpeg.org/ffmpeg.git
307 lines
9.8 KiB
C
307 lines
9.8 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 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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#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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static const char *const var_names[] = {
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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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"NB_CONSUMED_SAMPLES", ///< number of samples consumed by the filter (only audio)
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"NB_SAMPLES", ///< number of samples in the current frame (only audio)
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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_INT", ///< previous input time in seconds
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"PREV_OUTPTS", ///< previous output PTS
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"PREV_OUTT", ///< previous output time in seconds
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"PTS", ///< original pts in the file of the frame
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"SAMPLE_RATE", ///< sample rate (only audio)
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"STARTPTS", ///< PTS at start of movie
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"STARTT", ///< time at start of movie
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"T", ///< original time in the file of the frame
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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_FRAME_RATE,
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VAR_INTERLACED,
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VAR_N,
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VAR_NB_CONSUMED_SAMPLES,
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VAR_NB_SAMPLES,
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VAR_POS,
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VAR_PREV_INPTS,
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VAR_PREV_INT,
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VAR_PREV_OUTPTS,
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VAR_PREV_OUTT,
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VAR_PTS,
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VAR_SAMPLE_RATE,
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VAR_STARTPTS,
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VAR_STARTT,
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VAR_T,
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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 {
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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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enum AVMediaType type;
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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_N] = 0.0;
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setpts->var_values[VAR_S] = 0.0;
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setpts->var_values[VAR_PREV_INPTS] = NAN;
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setpts->var_values[VAR_PREV_INT] = NAN;
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setpts->var_values[VAR_PREV_OUTPTS] = NAN;
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setpts->var_values[VAR_PREV_OUTT] = NAN;
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setpts->var_values[VAR_STARTPTS] = NAN;
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setpts->var_values[VAR_STARTT] = 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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AVFilterContext *ctx = inlink->dst;
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SetPTSContext *setpts = ctx->priv;
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setpts->type = inlink->type;
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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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setpts->var_values[VAR_SR] =
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setpts->var_values[VAR_SAMPLE_RATE] =
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setpts->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
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setpts->var_values[VAR_FRAME_RATE] = inlink->frame_rate.num && inlink->frame_rate.den ?
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av_q2d(inlink->frame_rate) : NAN;
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av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f FRAME_RATE:%f SAMPLE_RATE:%f\n",
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setpts->var_values[VAR_TB],
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setpts->var_values[VAR_FRAME_RATE],
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setpts->var_values[VAR_SAMPLE_RATE]);
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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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#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb))
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#define BUF_SIZE 64
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static inline char *double2int64str(char *buf, double v)
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{
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if (isnan(v)) snprintf(buf, BUF_SIZE, "nan");
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else snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)v);
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return buf;
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}
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#define d2istr(v) double2int64str((char[BUF_SIZE]){0}, v)
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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_STARTT ] = TS2T(frame->pts, inlink->time_base);
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}
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setpts->var_values[VAR_PTS ] = TS2D(frame->pts);
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setpts->var_values[VAR_T ] = TS2T(frame->pts, inlink->time_base);
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setpts->var_values[VAR_POS ] = av_frame_get_pkt_pos(frame) == -1 ? NAN : av_frame_get_pkt_pos(frame);
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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 if (inlink->type == AVMEDIA_TYPE_AUDIO) {
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setpts->var_values[VAR_S] = frame->nb_samples;
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setpts->var_values[VAR_NB_SAMPLES] = 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_DEBUG,
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"N:%"PRId64" PTS:%s T:%f POS:%s",
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(int64_t)setpts->var_values[VAR_N],
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d2istr(setpts->var_values[VAR_PTS]),
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setpts->var_values[VAR_T],
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d2istr(setpts->var_values[VAR_POS]));
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switch (inlink->type) {
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case AVMEDIA_TYPE_VIDEO:
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av_log(inlink->dst, AV_LOG_DEBUG, " INTERLACED:%"PRId64,
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(int64_t)setpts->var_values[VAR_INTERLACED]);
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break;
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case AVMEDIA_TYPE_AUDIO:
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av_log(inlink->dst, AV_LOG_DEBUG, " NB_SAMPLES:%"PRId64" NB_CONSUMED_SAMPLES:%"PRId64,
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(int64_t)setpts->var_values[VAR_NB_SAMPLES],
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(int64_t)setpts->var_values[VAR_NB_CONSUMED_SAMPLES]);
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break;
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}
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av_log(inlink->dst, AV_LOG_DEBUG, " -> PTS:%s T:%f\n", d2istr(d), TS2T(d, 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_INT ] = TS2T(in_pts, inlink->time_base);
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setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
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setpts->var_values[VAR_PREV_OUTT] = TS2T(frame->pts, inlink->time_base);
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if (setpts->type == AVMEDIA_TYPE_AUDIO) {
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setpts->var_values[VAR_NB_CONSUMED_SAMPLES] += frame->nb_samples;
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}
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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 | AV_OPT_FLAG_FILTERING_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 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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.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 /* CONFIG_SETPTS_FILTER */
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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 avfilter_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 /* CONFIG_ASETPTS_FILTER */
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