/* * 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 <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 "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)    "POS",         ///< original position in the file of the frame    "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    NULL}; enum var_name {    VAR_FRAME_RATE,    VAR_INTERLACED,    VAR_N,    VAR_NB_CONSUMED_SAMPLES,    VAR_NB_SAMPLES,    VAR_POS,    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_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;    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] = 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 D2TS(d)  (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb)) #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;} #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;     if (isnan(setpts->var_values[VAR_STARTPTS])) {        setpts->var_values[VAR_STARTPTS] = TS2D(frame->pts);        setpts->var_values[VAR_STARTT  ] = TS2T(frame->pts, inlink->time_base);    }    setpts->var_values[VAR_PTS       ] = TS2D(frame->pts);    setpts->var_values[VAR_T         ] = TS2T(frame->pts, inlink->time_base);    setpts->var_values[VAR_POS       ] = av_frame_get_pkt_pos(frame) == -1 ? NAN : av_frame_get_pkt_pos(frame);    setpts->var_values[VAR_RTCTIME   ] = av_gettime();     if (inlink->type == AVMEDIA_TYPE_VIDEO) {        setpts->var_values[VAR_INTERLACED] = frame->interlaced_frame;    } else if (inlink->type == AVMEDIA_TYPE_AUDIO) {        setpts->var_values[VAR_S] = frame->nb_samples;        setpts->var_values[VAR_NB_SAMPLES] = frame->nb_samples;    }     d = av_expr_eval(setpts->expr, setpts->var_values, NULL);    frame->pts = D2TS(d);     av_log(inlink->dst, AV_LOG_TRACE,            "N:%"PRId64" PTS:%s T:%f POS:%s",            (int64_t)setpts->var_values[VAR_N],            d2istr(setpts->var_values[VAR_PTS]),            setpts->var_values[VAR_T],            d2istr(setpts->var_values[VAR_POS]));    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 av_cold void uninit(AVFilterContext *ctx){    SetPTSContext *setpts = ctx->priv;    av_expr_free(setpts->expr);    setpts->expr = NULL;} #define OFFSET(x) offsetof(SetPTSContext, x)#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAMstatic const AVOption options[] = {    { "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = FLAGS },    { NULL }}; #if CONFIG_SETPTS_FILTER#define setpts_options optionsAVFILTER_DEFINE_CLASS(setpts); static const AVFilterPad avfilter_vf_setpts_inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_VIDEO,        .config_props = config_input,        .filter_frame = filter_frame,    },    { NULL }}; static const AVFilterPad avfilter_vf_setpts_outputs[] = {    {        .name = "default",        .type = AVMEDIA_TYPE_VIDEO,    },    { NULL }}; AVFilter ff_vf_setpts = {    .name      = "setpts",    .description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),    .init      = init,    .uninit    = uninit,     .priv_size = sizeof(SetPTSContext),    .priv_class = &setpts_class,     .inputs    = avfilter_vf_setpts_inputs,    .outputs   = avfilter_vf_setpts_outputs,};#endif /* CONFIG_SETPTS_FILTER */ #if CONFIG_ASETPTS_FILTER #define asetpts_options optionsAVFILTER_DEFINE_CLASS(asetpts); static const AVFilterPad asetpts_inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_AUDIO,        .config_props = config_input,        .filter_frame = filter_frame,    },    { NULL }}; static const AVFilterPad asetpts_outputs[] = {    {        .name = "default",        .type = AVMEDIA_TYPE_AUDIO,    },    { NULL }}; AVFilter ff_af_asetpts = {    .name        = "asetpts",    .description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),    .init        = init,    .uninit      = uninit,    .priv_size   = sizeof(SetPTSContext),    .priv_class  = &asetpts_class,    .inputs      = asetpts_inputs,    .outputs     = asetpts_outputs,};#endif /* CONFIG_ASETPTS_FILTER */