yading@10: /*
yading@10:  * Copyright (c) 2010 Stefano Sabatini
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Set timebase for the output link.
yading@10:  */
yading@10: 
yading@10: #include <inttypes.h>
yading@10: #include <stdio.h>
yading@10: 
yading@10: #include "libavutil/avstring.h"
yading@10: #include "libavutil/eval.h"
yading@10: #include "libavutil/internal.h"
yading@10: #include "libavutil/mathematics.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/rational.h"
yading@10: #include "avfilter.h"
yading@10: #include "internal.h"
yading@10: #include "audio.h"
yading@10: #include "video.h"
yading@10: 
yading@10: static const char *const var_names[] = {
yading@10:     "AVTB",   /* default timebase 1/AV_TIME_BASE */
yading@10:     "intb",   /* input timebase */
yading@10:     "sr",     /* sample rate */
yading@10:     NULL
yading@10: };
yading@10: 
yading@10: enum var_name {
yading@10:     VAR_AVTB,
yading@10:     VAR_INTB,
yading@10:     VAR_SR,
yading@10:     VAR_VARS_NB
yading@10: };
yading@10: 
yading@10: typedef struct {
yading@10:     const AVClass *class;
yading@10:     char *tb_expr;
yading@10:     double var_values[VAR_VARS_NB];
yading@10: } SetTBContext;
yading@10: 
yading@10: #define OFFSET(x) offsetof(SetTBContext, x)
yading@10: #define DEFINE_OPTIONS(filt_name, filt_type)                                               \
yading@10: static const AVOption filt_name##_options[] = {                                            \
yading@10:     { "expr", "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \
yading@10:            .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM },           \
yading@10:     { "tb",   "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \
yading@10:            .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM },           \
yading@10:     { NULL }                                                                               \
yading@10: }
yading@10: 
yading@10: static int config_output_props(AVFilterLink *outlink)
yading@10: {
yading@10:     AVFilterContext *ctx = outlink->src;
yading@10:     SetTBContext *settb = ctx->priv;
yading@10:     AVFilterLink *inlink = ctx->inputs[0];
yading@10:     AVRational time_base;
yading@10:     int ret;
yading@10:     double res;
yading@10: 
yading@10:     settb->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q);
yading@10:     settb->var_values[VAR_INTB] = av_q2d(inlink->time_base);
yading@10:     settb->var_values[VAR_SR]   = inlink->sample_rate;
yading@10: 
yading@10:     outlink->w = inlink->w;
yading@10:     outlink->h = inlink->h;
yading@10: 
yading@10:     if ((ret = av_expr_parse_and_eval(&res, settb->tb_expr, var_names, settb->var_values,
yading@10:                                       NULL, NULL, NULL, NULL, NULL, 0, NULL)) < 0) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Invalid expression '%s' for timebase.\n", settb->tb_expr);
yading@10:         return ret;
yading@10:     }
yading@10:     time_base = av_d2q(res, INT_MAX);
yading@10:     if (time_base.num <= 0 || time_base.den <= 0) {
yading@10:         av_log(ctx, AV_LOG_ERROR,
yading@10:                "Invalid non-positive values for the timebase num:%d or den:%d.\n",
yading@10:                time_base.num, time_base.den);
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     outlink->time_base = time_base;
yading@10:     av_log(outlink->src, AV_LOG_VERBOSE, "tb:%d/%d -> tb:%d/%d\n",
yading@10:            inlink ->time_base.num, inlink ->time_base.den,
yading@10:            outlink->time_base.num, outlink->time_base.den);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
yading@10: {
yading@10:     AVFilterContext *ctx = inlink->dst;
yading@10:     AVFilterLink *outlink = ctx->outputs[0];
yading@10: 
yading@10:     if (av_cmp_q(inlink->time_base, outlink->time_base)) {
yading@10:         int64_t orig_pts = frame->pts;
yading@10:         frame->pts = av_rescale_q(frame->pts, inlink->time_base, outlink->time_base);
yading@10:         av_log(ctx, AV_LOG_DEBUG, "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n",
yading@10:                inlink ->time_base.num, inlink ->time_base.den, orig_pts,
yading@10:                outlink->time_base.num, outlink->time_base.den, frame->pts);
yading@10:     }
yading@10: 
yading@10:     return ff_filter_frame(outlink, frame);
yading@10: }
yading@10: 
yading@10: #if CONFIG_SETTB_FILTER
yading@10: 
yading@10: DEFINE_OPTIONS(settb, VIDEO);
yading@10: AVFILTER_DEFINE_CLASS(settb);
yading@10: 
yading@10: static const AVFilterPad avfilter_vf_settb_inputs[] = {
yading@10:     {
yading@10:         .name             = "default",
yading@10:         .type             = AVMEDIA_TYPE_VIDEO,
yading@10:         .get_video_buffer = ff_null_get_video_buffer,
yading@10:         .filter_frame     = filter_frame,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVFilterPad avfilter_vf_settb_outputs[] = {
yading@10:     {
yading@10:         .name         = "default",
yading@10:         .type         = AVMEDIA_TYPE_VIDEO,
yading@10:         .config_props = config_output_props,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVFilter avfilter_vf_settb = {
yading@10:     .name      = "settb",
yading@10:     .description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."),
yading@10: 
yading@10:     .priv_size = sizeof(SetTBContext),
yading@10:     .priv_class = &settb_class,
yading@10: 
yading@10:     .inputs    = avfilter_vf_settb_inputs,
yading@10:     .outputs   = avfilter_vf_settb_outputs,
yading@10: };
yading@10: #endif
yading@10: 
yading@10: #if CONFIG_ASETTB_FILTER
yading@10: 
yading@10: DEFINE_OPTIONS(asettb, AUDIO);
yading@10: AVFILTER_DEFINE_CLASS(asettb);
yading@10: 
yading@10: static const AVFilterPad avfilter_af_asettb_inputs[] = {
yading@10:     {
yading@10:         .name             = "default",
yading@10:         .type             = AVMEDIA_TYPE_AUDIO,
yading@10:         .get_audio_buffer = ff_null_get_audio_buffer,
yading@10:         .filter_frame     = filter_frame,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVFilterPad avfilter_af_asettb_outputs[] = {
yading@10:     {
yading@10:         .name         = "default",
yading@10:         .type         = AVMEDIA_TYPE_AUDIO,
yading@10:         .config_props = config_output_props,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVFilter avfilter_af_asettb = {
yading@10:     .name      = "asettb",
yading@10:     .description = NULL_IF_CONFIG_SMALL("Set timebase for the audio output link."),
yading@10: 
yading@10:     .priv_size = sizeof(SetTBContext),
yading@10:     .inputs    = avfilter_af_asettb_inputs,
yading@10:     .outputs   = avfilter_af_asettb_outputs,
yading@10:     .priv_class = &asettb_class,
yading@10: };
yading@10: #endif