/* * 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 <inttypes.h>#include <stdio.h> #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 "audio.h"#include "avfilter.h"#include "internal.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 SetTBContext {    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 ff_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 /* CONFIG_SETTB_FILTER */ #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 ff_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 /* CONFIG_ASETTB_FILTER */