From b33c64e4c2e0fd2484352c5eef3c667ad094ca27 Mon Sep 17 00:00:00 2001 From: Katerina Barone-Adesi Date: Tue, 1 Apr 2014 16:51:40 +0200 Subject: vf_settb: rename to settb An audio version of settb (asettb) will be added to this file. Signed-off-by: Diego Biurrun --- libavfilter/settb.c | 161 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 161 insertions(+) create mode 100644 libavfilter/settb.c (limited to 'libavfilter/settb.c') diff --git a/libavfilter/settb.c b/libavfilter/settb.c new file mode 100644 index 0000000000..87b60a7405 --- /dev/null +++ b/libavfilter/settb.c @@ -0,0 +1,161 @@ +/* + * Copyright (c) 2010 Stefano Sabatini + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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 "video.h" + +static const char *const var_names[] = { + "E", + "PHI", + "PI", + "AVTB", /* default timebase 1/AV_TIME_BASE */ + "intb", /* input timebase */ + NULL +}; + +enum var_name { + VAR_E, + VAR_PHI, + VAR_PI, + VAR_AVTB, + VAR_INTB, + VAR_VARS_NB +}; + +typedef struct { + const AVClass *class; + char *tb_expr; + double var_values[VAR_VARS_NB]; +} SetTBContext; + +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_E] = M_E; + settb->var_values[VAR_PHI] = M_PHI; + settb->var_values[VAR_PI] = M_PI; + settb->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q); + settb->var_values[VAR_INTB] = av_q2d(inlink->time_base); + + 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); +} + +#define OFFSET(x) offsetof(SetTBContext, x) +#define FLAGS AV_OPT_FLAG_VIDEO_PARAM +static const AVOption options[] = { + { "expr", "Expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, { .str = "intb" }, .flags = FLAGS }, + { NULL }, +}; + +static const AVClass settb_class = { + .class_name = "settb", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +static const AVFilterPad avfilter_vf_settb_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .get_video_buffer = ff_null_get_video_buffer, + .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 output link."), + + .priv_size = sizeof(SetTBContext), + .priv_class = &settb_class, + + .inputs = avfilter_vf_settb_inputs, + + .outputs = avfilter_vf_settb_outputs, +}; -- cgit v1.2.3