/* * 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 */