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204 lines
5.8 KiB
204 lines
5.8 KiB
/* |
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* Copyright (c) 2010 Stefano Sabatini |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 "internal.h" |
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#include "video.h" |
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static const char *const var_names[] = { |
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"E", |
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"PHI", |
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"PI", |
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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_E, |
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VAR_PHI, |
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VAR_PI, |
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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 { |
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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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static int config_output_props(AVFilterLink *outlink) |
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{ |
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AVFilterContext *ctx = outlink->src; |
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SetTBContext *settb = ctx->priv; |
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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_E] = M_E; |
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settb->var_values[VAR_PHI] = M_PHI; |
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settb->var_values[VAR_PI] = M_PI; |
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settb->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q); |
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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 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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if (av_cmp_q(inlink->time_base, outlink->time_base)) { |
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int64_t orig_pts = frame->pts; |
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frame->pts = av_rescale_q(frame->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, frame->pts); |
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} |
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return ff_filter_frame(outlink, frame); |
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} |
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#define OFFSET(x) offsetof(SetTBContext, x) |
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM |
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static const AVOption options[] = { |
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{ "expr", "Expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, { .str = "intb" }, .flags = FLAGS }, |
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{ NULL }, |
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}; |
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#if CONFIG_SETTB_FILTER |
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static const AVClass settb_class = { |
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.class_name = "settb", |
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.item_name = av_default_item_name, |
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.option = options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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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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.get_video_buffer = ff_null_get_video_buffer, |
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.filter_frame = filter_frame, |
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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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}; |
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#endif /* CONFIG_SETTB_FILTER */ |
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#if CONFIG_ASETTB_FILTER |
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static const AVClass asettb_class = { |
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.class_name = "asettb", |
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.item_name = av_default_item_name, |
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.option = options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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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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.get_audio_buffer = ff_null_get_audio_buffer, |
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.filter_frame = filter_frame, |
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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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}; |
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#endif /* CONFIG_ASETTB_FILTER */
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