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/*

 * Copyright (c) 2010 Stefano Sabatini

 *

 * 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

 * Set timebase for the output link.

 */

#include 

#include 

#include "libavutil/avstring.h"

#include "libavutil/eval.h"

#include "libavutil/internal.h"

#include "libavutil/mathematics.h"

#include "libavutil/opt.h"

#include "libavutil/rational.h"

#include "avfilter.h"

#include "internal.h"

#include "audio.h"

#include "video.h"

static const char *const var_names[] = {

    "AVTB",   /* default timebase 1/AV_TIME_BASE */

    "intb",   /* input timebase */

    "sr",     /* sample rate */

    NULL

};

enum var_name {

    VAR_AVTB,

    VAR_INTB,

    VAR_SR,

    VAR_VARS_NB

};

typedef struct {

    const AVClass *class;

    char *tb_expr;

    double var_values[VAR_VARS_NB];

} SetTBContext;

#define OFFSET(x) offsetof(SetTBContext, x)

#define DEFINE_OPTIONS(filt_name, filt_type)                                               \

static const AVOption filt_name##_options[] = {                                            \

    { "expr", "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \

           .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM },           \

    { "tb",   "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \

           .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM },           \

    { NULL }                                                                               \

}

static int config_output_props(AVFilterLink *outlink)

{

    AVFilterContext *ctx = outlink->src;

    SetTBContext *settb = ctx->priv;

    AVFilterLink *inlink = ctx->inputs[0];

    AVRational time_base;

    int ret;

    double res;

    settb->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q);

    settb->var_values[VAR_INTB] = av_q2d(inlink->time_base);

    settb->var_values[VAR_SR]   = inlink->sample_rate;

    outlink->w = inlink->w;

    outlink->h = inlink->h;

    if ((ret = av_expr_parse_and_eval(&res, settb->tb_expr, var_names, settb->var_values,

                                      NULL, NULL, NULL, NULL, NULL, 0, NULL)) < 0) {

        av_log(ctx, AV_LOG_ERROR, "Invalid expression '%s' for timebase.\n", settb->tb_expr);

        return ret;

    }

    time_base = av_d2q(res, INT_MAX);

    if (time_base.num <= 0 || time_base.den <= 0) {

        av_log(ctx, AV_LOG_ERROR,

               "Invalid non-positive values for the timebase num:%d or den:%d.\n",

               time_base.num, time_base.den);

        return AVERROR(EINVAL);

    }

    outlink->time_base = time_base;

    av_log(outlink->src, AV_LOG_VERBOSE, "tb:%d/%d -> tb:%d/%d\n",

           inlink ->time_base.num, inlink ->time_base.den,

           outlink->time_base.num, outlink->time_base.den);

    return 0;

}

static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

{

    AVFilterContext *ctx = inlink->dst;

    AVFilterLink *outlink = ctx->outputs[0];

    if (av_cmp_q(inlink->time_base, outlink->time_base)) {

        int64_t orig_pts = frame->pts;

        frame->pts = av_rescale_q(frame->pts, inlink->time_base, outlink->time_base);

        av_log(ctx, AV_LOG_DEBUG, "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n",

               inlink ->time_base.num, inlink ->time_base.den, orig_pts,

               outlink->time_base.num, outlink->time_base.den, frame->pts);

    }

    return ff_filter_frame(outlink, frame);

}

#if CONFIG_SETTB_FILTER

DEFINE_OPTIONS(settb, VIDEO);

AVFILTER_DEFINE_CLASS(settb);

static const AVFilterPad avfilter_vf_settb_inputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_VIDEO,

        .filter_frame = filter_frame,

    },

    { NULL }

};

static const AVFilterPad avfilter_vf_settb_outputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_VIDEO,

        .config_props = config_output_props,

    },

    { NULL }

};

AVFilter avfilter_vf_settb = {

    .name        = "settb",

    .description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."),

    .priv_size   = sizeof(SetTBContext),

    .priv_class  = &settb_class,

    .inputs      = avfilter_vf_settb_inputs,

    .outputs     = avfilter_vf_settb_outputs,

};

#endif

#if CONFIG_ASETTB_FILTER

DEFINE_OPTIONS(asettb, AUDIO);

AVFILTER_DEFINE_CLASS(asettb);

static const AVFilterPad avfilter_af_asettb_inputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_AUDIO,

        .filter_frame = filter_frame,

    },

    { NULL }

};

static const AVFilterPad avfilter_af_asettb_outputs[] = {

    {

        .name         = "default",

        .type         = AVMEDIA_TYPE_AUDIO,

        .config_props = config_output_props,

    },

    { NULL }

};

AVFilter avfilter_af_asettb = {

    .name        = "asettb",

    .description = NULL_IF_CONFIG_SMALL("Set timebase for the audio output link."),

    .priv_size   = sizeof(SetTBContext),

    .inputs      = avfilter_af_asettb_inputs,

    .outputs     = avfilter_af_asettb_outputs,

    .priv_class  = &asettb_class,

};

#endif