GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/settb.c Lines: 39 45 86.7 %
Date: 2020-08-11 16:46:18 Branches: 11 18 61.1 %

Line Branch Exec Source
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/*
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 * Copyright (c) 2010 Stefano Sabatini
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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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 * Set timebase for the output link.
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 */
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#include <inttypes.h>
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#include <stdio.h>
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#include "libavutil/avstring.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/rational.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "filters.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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    "AVTB",   /* default timebase 1/AV_TIME_BASE */
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    "intb",   /* input timebase */
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    "sr",     /* sample rate */
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    NULL
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};
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enum var_name {
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    VAR_AVTB,
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    VAR_INTB,
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    VAR_SR,
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    VAR_VARS_NB
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};
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typedef struct SetTBContext {
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    const AVClass *class;
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    char *tb_expr;
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    double var_values[VAR_VARS_NB];
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} SetTBContext;
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#define OFFSET(x) offsetof(SetTBContext, x)
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#define DEFINE_OPTIONS(filt_name, filt_type)                                               \
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static const AVOption filt_name##_options[] = {                                            \
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    { "expr", "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \
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           .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM },           \
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    { "tb",   "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \
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           .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM },           \
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    { NULL }                                                                               \
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}
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static int config_output_props(AVFilterLink *outlink)
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{
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    AVFilterContext *ctx = outlink->src;
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1
    SetTBContext *settb = ctx->priv;
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1
    AVFilterLink *inlink = ctx->inputs[0];
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    AVRational time_base;
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    int ret;
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    double res;
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    settb->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q);
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1
    settb->var_values[VAR_INTB] = av_q2d(inlink->time_base);
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    settb->var_values[VAR_SR]   = inlink->sample_rate;
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    outlink->w = inlink->w;
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    outlink->h = inlink->h;
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    if ((ret = av_expr_parse_and_eval(&res, settb->tb_expr, var_names, settb->var_values,
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                                      NULL, NULL, NULL, NULL, NULL, 0, NULL)) < 0) {
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        av_log(ctx, AV_LOG_ERROR, "Invalid expression '%s' for timebase.\n", settb->tb_expr);
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        return ret;
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    }
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    time_base = av_d2q(res, INT_MAX);
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    if (time_base.num <= 0 || time_base.den <= 0) {
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        av_log(ctx, AV_LOG_ERROR,
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               "Invalid non-positive values for the timebase num:%d or den:%d.\n",
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               time_base.num, time_base.den);
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        return AVERROR(EINVAL);
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    }
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    outlink->time_base = time_base;
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    av_log(outlink->src, AV_LOG_VERBOSE, "tb:%d/%d -> tb:%d/%d\n",
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           inlink ->time_base.num, inlink ->time_base.den,
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           outlink->time_base.num, outlink->time_base.den);
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    return 0;
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}
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static int64_t rescale_pts(AVFilterLink *inlink, AVFilterLink *outlink, int64_t orig_pts)
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{
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    AVFilterContext *ctx = inlink->dst;
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    int64_t new_pts = orig_pts;
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    if (av_cmp_q(inlink->time_base, outlink->time_base)) {
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        new_pts = av_rescale_q(orig_pts, inlink->time_base, outlink->time_base);
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        av_log(ctx, AV_LOG_DEBUG, "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n",
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               inlink ->time_base.num, inlink ->time_base.den, orig_pts,
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               outlink->time_base.num, outlink->time_base.den, new_pts);
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    }
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    return new_pts;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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    AVFilterContext *ctx = inlink->dst;
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    AVFilterLink *outlink = ctx->outputs[0];
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    frame->pts = rescale_pts(inlink, outlink, frame->pts);
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    return ff_filter_frame(outlink, frame);
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}
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static int activate(AVFilterContext *ctx)
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{
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    AVFilterLink *inlink = ctx->inputs[0];
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    AVFilterLink *outlink = ctx->outputs[0];
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    AVFrame *in;
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    int status;
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    int64_t pts;
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    int ret;
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    FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
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    ret = ff_inlink_consume_frame(inlink, &in);
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    if (ret < 0)
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        return ret;
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    if (ret > 0)
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        return filter_frame(inlink, in);
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    if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
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        ff_outlink_set_status(outlink, status, rescale_pts(inlink, outlink, pts));
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        return 0;
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    }
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    FF_FILTER_FORWARD_WANTED(outlink, inlink);
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    return FFERROR_NOT_READY;
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}
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#if CONFIG_SETTB_FILTER
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DEFINE_OPTIONS(settb, VIDEO);
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AVFILTER_DEFINE_CLASS(settb);
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static const AVFilterPad avfilter_vf_settb_inputs[] = {
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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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static const AVFilterPad avfilter_vf_settb_outputs[] = {
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    {
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        .name         = "default",
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        .type         = AVMEDIA_TYPE_VIDEO,
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        .config_props = config_output_props,
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    },
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    { NULL }
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};
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AVFilter ff_vf_settb = {
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    .name        = "settb",
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    .description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."),
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    .priv_size   = sizeof(SetTBContext),
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    .priv_class  = &settb_class,
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    .inputs      = avfilter_vf_settb_inputs,
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    .outputs     = avfilter_vf_settb_outputs,
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    .activate    = activate,
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};
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#endif /* CONFIG_SETTB_FILTER */
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#if CONFIG_ASETTB_FILTER
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DEFINE_OPTIONS(asettb, AUDIO);
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AVFILTER_DEFINE_CLASS(asettb);
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static const AVFilterPad avfilter_af_asettb_inputs[] = {
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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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static const AVFilterPad avfilter_af_asettb_outputs[] = {
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    {
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        .name         = "default",
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        .type         = AVMEDIA_TYPE_AUDIO,
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        .config_props = config_output_props,
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    },
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    { NULL }
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};
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AVFilter ff_af_asettb = {
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    .name        = "asettb",
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    .description = NULL_IF_CONFIG_SMALL("Set timebase for the audio output link."),
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    .priv_size   = sizeof(SetTBContext),
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    .inputs      = avfilter_af_asettb_inputs,
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    .outputs     = avfilter_af_asettb_outputs,
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    .priv_class  = &asettb_class,
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    .activate    = activate,
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};
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#endif /* CONFIG_ASETTB_FILTER */