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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 "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 {

    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_DEBUG,

           "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_DEBUG, " INTERLACED:%"PRId64,

               (int64_t)setpts->var_values[VAR_INTERLACED]);

        break;

    case AVMEDIA_TYPE_AUDIO:

        av_log(inlink->dst, AV_LOG_DEBUG, " 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_DEBUG, " -> 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_PARAM

static 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 options

AVFILTER_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 avfilter_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 options

AVFILTER_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 avfilter_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 */