2 * Copyright (c) 2010 Stefano Sabatini
4 * This file is part of FFmpeg.
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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[] = {
41 "AVTB", /* default timebase 1/AV_TIME_BASE */
42 "intb", /* input timebase */
43 "sr", /* sample rate */
54 typedef struct SetTBContext {
57 double var_values[VAR_VARS_NB];
60 #define OFFSET(x) offsetof(SetTBContext, x)
61 #define DEFINE_OPTIONS(filt_name, filt_type) \
62 static const AVOption filt_name##_options[] = { \
63 { "expr", "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \
64 .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM }, \
65 { "tb", "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \
66 .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM }, \
70 static int config_output_props(AVFilterLink *outlink)
72 AVFilterContext *ctx = outlink->src;
73 SetTBContext *settb = ctx->priv;
74 AVFilterLink *inlink = ctx->inputs[0];
79 settb->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q);
80 settb->var_values[VAR_INTB] = av_q2d(inlink->time_base);
81 settb->var_values[VAR_SR] = inlink->sample_rate;
83 outlink->w = inlink->w;
84 outlink->h = inlink->h;
86 if ((ret = av_expr_parse_and_eval(&res, settb->tb_expr, var_names, settb->var_values,
87 NULL, NULL, NULL, NULL, NULL, 0, NULL)) < 0) {
88 av_log(ctx, AV_LOG_ERROR, "Invalid expression '%s' for timebase.\n", settb->tb_expr);
91 time_base = av_d2q(res, INT_MAX);
92 if (time_base.num <= 0 || time_base.den <= 0) {
93 av_log(ctx, AV_LOG_ERROR,
94 "Invalid non-positive values for the timebase num:%d or den:%d.\n",
95 time_base.num, time_base.den);
96 return AVERROR(EINVAL);
99 outlink->time_base = time_base;
100 av_log(outlink->src, AV_LOG_VERBOSE, "tb:%d/%d -> tb:%d/%d\n",
101 inlink ->time_base.num, inlink ->time_base.den,
102 outlink->time_base.num, outlink->time_base.den);
107 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
109 AVFilterContext *ctx = inlink->dst;
110 AVFilterLink *outlink = ctx->outputs[0];
112 if (av_cmp_q(inlink->time_base, outlink->time_base)) {
113 int64_t orig_pts = frame->pts;
114 frame->pts = av_rescale_q(frame->pts, inlink->time_base, outlink->time_base);
115 av_log(ctx, AV_LOG_DEBUG, "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n",
116 inlink ->time_base.num, inlink ->time_base.den, orig_pts,
117 outlink->time_base.num, outlink->time_base.den, frame->pts);
120 return ff_filter_frame(outlink, frame);
123 #if CONFIG_SETTB_FILTER
125 DEFINE_OPTIONS(settb, VIDEO);
126 AVFILTER_DEFINE_CLASS(settb);
128 static const AVFilterPad avfilter_vf_settb_inputs[] = {
131 .type = AVMEDIA_TYPE_VIDEO,
132 .filter_frame = filter_frame,
137 static const AVFilterPad avfilter_vf_settb_outputs[] = {
140 .type = AVMEDIA_TYPE_VIDEO,
141 .config_props = config_output_props,
146 AVFilter ff_vf_settb = {
148 .description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."),
149 .priv_size = sizeof(SetTBContext),
150 .priv_class = &settb_class,
151 .inputs = avfilter_vf_settb_inputs,
152 .outputs = avfilter_vf_settb_outputs,
154 #endif /* CONFIG_SETTB_FILTER */
156 #if CONFIG_ASETTB_FILTER
158 DEFINE_OPTIONS(asettb, AUDIO);
159 AVFILTER_DEFINE_CLASS(asettb);
161 static const AVFilterPad avfilter_af_asettb_inputs[] = {
164 .type = AVMEDIA_TYPE_AUDIO,
165 .filter_frame = filter_frame,
170 static const AVFilterPad avfilter_af_asettb_outputs[] = {
173 .type = AVMEDIA_TYPE_AUDIO,
174 .config_props = config_output_props,
179 AVFilter ff_af_asettb = {
181 .description = NULL_IF_CONFIG_SMALL("Set timebase for the audio output link."),
182 .priv_size = sizeof(SetTBContext),
183 .inputs = avfilter_af_asettb_inputs,
184 .outputs = avfilter_af_asettb_outputs,
185 .priv_class = &asettb_class,
187 #endif /* CONFIG_ASETTB_FILTER */