2 * Copyright (c) 2010 Stefano Sabatini
4 * This file is part of Libav.
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * Set timebase for the output link.
29 #include "libavutil/avstring.h"
30 #include "libavutil/eval.h"
31 #include "libavutil/internal.h"
32 #include "libavutil/mathematics.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/rational.h"
40 static const char *const var_names[] = {
44 "AVTB", /* default timebase 1/AV_TIME_BASE */
45 "intb", /* input timebase */
46 "sr", /* sample rate */
60 typedef struct SetTBContext {
63 double var_values[VAR_VARS_NB];
66 static int config_output_props(AVFilterLink *outlink)
68 AVFilterContext *ctx = outlink->src;
69 SetTBContext *settb = ctx->priv;
70 AVFilterLink *inlink = ctx->inputs[0];
75 settb->var_values[VAR_E] = M_E;
76 settb->var_values[VAR_PHI] = M_PHI;
77 settb->var_values[VAR_PI] = M_PI;
78 settb->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q);
79 settb->var_values[VAR_INTB] = av_q2d(inlink->time_base);
80 settb->var_values[VAR_SR] = inlink->sample_rate;
82 outlink->w = inlink->w;
83 outlink->h = inlink->h;
85 if ((ret = av_expr_parse_and_eval(&res, settb->tb_expr, var_names, settb->var_values,
86 NULL, NULL, NULL, NULL, NULL, 0, NULL)) < 0) {
87 av_log(ctx, AV_LOG_ERROR, "Invalid expression '%s' for timebase.\n", settb->tb_expr);
90 time_base = av_d2q(res, INT_MAX);
91 if (time_base.num <= 0 || time_base.den <= 0) {
92 av_log(ctx, AV_LOG_ERROR,
93 "Invalid non-positive values for the timebase num:%d or den:%d.\n",
94 time_base.num, time_base.den);
95 return AVERROR(EINVAL);
98 outlink->time_base = time_base;
99 av_log(outlink->src, AV_LOG_VERBOSE, "tb:%d/%d -> tb:%d/%d\n",
100 inlink ->time_base.num, inlink ->time_base.den,
101 outlink->time_base.num, outlink->time_base.den);
106 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
108 AVFilterContext *ctx = inlink->dst;
109 AVFilterLink *outlink = ctx->outputs[0];
111 if (av_cmp_q(inlink->time_base, outlink->time_base)) {
112 int64_t orig_pts = frame->pts;
113 frame->pts = av_rescale_q(frame->pts, inlink->time_base, outlink->time_base);
114 av_log(ctx, AV_LOG_DEBUG, "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n",
115 inlink ->time_base.num, inlink ->time_base.den, orig_pts,
116 outlink->time_base.num, outlink->time_base.den, frame->pts);
119 return ff_filter_frame(outlink, frame);
122 #define OFFSET(x) offsetof(SetTBContext, x)
123 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM
124 static const AVOption options[] = {
125 { "expr", "Expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, { .str = "intb" }, .flags = FLAGS },
129 #if CONFIG_SETTB_FILTER
130 static const AVClass settb_class = {
131 .class_name = "settb",
132 .item_name = av_default_item_name,
134 .version = LIBAVUTIL_VERSION_INT,
137 static const AVFilterPad avfilter_vf_settb_inputs[] = {
140 .type = AVMEDIA_TYPE_VIDEO,
141 .get_video_buffer = ff_null_get_video_buffer,
142 .filter_frame = filter_frame,
147 static const AVFilterPad avfilter_vf_settb_outputs[] = {
150 .type = AVMEDIA_TYPE_VIDEO,
151 .config_props = config_output_props,
156 AVFilter ff_vf_settb = {
158 .description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."),
160 .priv_size = sizeof(SetTBContext),
161 .priv_class = &settb_class,
163 .inputs = avfilter_vf_settb_inputs,
165 .outputs = avfilter_vf_settb_outputs,
167 #endif /* CONFIG_SETTB_FILTER */
169 #if CONFIG_ASETTB_FILTER
170 static const AVClass asettb_class = {
171 .class_name = "asettb",
172 .item_name = av_default_item_name,
174 .version = LIBAVUTIL_VERSION_INT,
177 static const AVFilterPad avfilter_af_asettb_inputs[] = {
180 .type = AVMEDIA_TYPE_AUDIO,
181 .get_audio_buffer = ff_null_get_audio_buffer,
182 .filter_frame = filter_frame,
187 static const AVFilterPad avfilter_af_asettb_outputs[] = {
190 .type = AVMEDIA_TYPE_AUDIO,
191 .config_props = config_output_props,
196 AVFilter ff_af_asettb = {
198 .description = NULL_IF_CONFIG_SMALL("Set timebase for the audio output link."),
199 .priv_size = sizeof(SetTBContext),
200 .inputs = avfilter_af_asettb_inputs,
201 .outputs = avfilter_af_asettb_outputs,
202 .priv_class = &asettb_class,
204 #endif /* CONFIG_ASETTB_FILTER */