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"
41 static const char *const var_names[] = {
42 "AVTB", /* default timebase 1/AV_TIME_BASE */
43 "intb", /* input timebase */
44 "sr", /* sample rate */
55 typedef struct SetTBContext {
58 double var_values[VAR_VARS_NB];
61 #define OFFSET(x) offsetof(SetTBContext, x)
62 #define DEFINE_OPTIONS(filt_name, filt_type) \
63 static const AVOption filt_name##_options[] = { \
64 { "expr", "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \
65 .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM }, \
66 { "tb", "set expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, {.str="intb"}, \
67 .flags=AV_OPT_FLAG_##filt_type##_PARAM|AV_OPT_FLAG_FILTERING_PARAM }, \
71 static int config_output_props(AVFilterLink *outlink)
73 AVFilterContext *ctx = outlink->src;
74 SetTBContext *settb = ctx->priv;
75 AVFilterLink *inlink = ctx->inputs[0];
80 settb->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q);
81 settb->var_values[VAR_INTB] = av_q2d(inlink->time_base);
82 settb->var_values[VAR_SR] = inlink->sample_rate;
84 outlink->w = inlink->w;
85 outlink->h = inlink->h;
87 if ((ret = av_expr_parse_and_eval(&res, settb->tb_expr, var_names, settb->var_values,
88 NULL, NULL, NULL, NULL, NULL, 0, NULL)) < 0) {
89 av_log(ctx, AV_LOG_ERROR, "Invalid expression '%s' for timebase.\n", settb->tb_expr);
92 time_base = av_d2q(res, INT_MAX);
93 if (time_base.num <= 0 || time_base.den <= 0) {
94 av_log(ctx, AV_LOG_ERROR,
95 "Invalid non-positive values for the timebase num:%d or den:%d.\n",
96 time_base.num, time_base.den);
97 return AVERROR(EINVAL);
100 outlink->time_base = time_base;
101 av_log(outlink->src, AV_LOG_VERBOSE, "tb:%d/%d -> tb:%d/%d\n",
102 inlink ->time_base.num, inlink ->time_base.den,
103 outlink->time_base.num, outlink->time_base.den);
108 static int64_t rescale_pts(AVFilterLink *inlink, AVFilterLink *outlink, int64_t orig_pts)
110 AVFilterContext *ctx = inlink->dst;
111 int64_t new_pts = orig_pts;
113 if (av_cmp_q(inlink->time_base, outlink->time_base)) {
114 new_pts = av_rescale_q(orig_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, new_pts);
123 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
125 AVFilterContext *ctx = inlink->dst;
126 AVFilterLink *outlink = ctx->outputs[0];
128 frame->pts = rescale_pts(inlink, outlink, frame->pts);
130 return ff_filter_frame(outlink, frame);
133 static int activate(AVFilterContext *ctx)
135 AVFilterLink *inlink = ctx->inputs[0];
136 AVFilterLink *outlink = ctx->outputs[0];
142 FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
144 ret = ff_inlink_consume_frame(inlink, &in);
148 return filter_frame(inlink, in);
150 if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
151 ff_outlink_set_status(outlink, status, rescale_pts(inlink, outlink, pts));
155 FF_FILTER_FORWARD_WANTED(outlink, inlink);
157 return FFERROR_NOT_READY;
160 #if CONFIG_SETTB_FILTER
162 DEFINE_OPTIONS(settb, VIDEO);
163 AVFILTER_DEFINE_CLASS(settb);
165 static const AVFilterPad avfilter_vf_settb_inputs[] = {
168 .type = AVMEDIA_TYPE_VIDEO,
173 static const AVFilterPad avfilter_vf_settb_outputs[] = {
176 .type = AVMEDIA_TYPE_VIDEO,
177 .config_props = config_output_props,
182 const AVFilter ff_vf_settb = {
184 .description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."),
185 .priv_size = sizeof(SetTBContext),
186 .priv_class = &settb_class,
187 .inputs = avfilter_vf_settb_inputs,
188 .outputs = avfilter_vf_settb_outputs,
189 .activate = activate,
191 #endif /* CONFIG_SETTB_FILTER */
193 #if CONFIG_ASETTB_FILTER
195 DEFINE_OPTIONS(asettb, AUDIO);
196 AVFILTER_DEFINE_CLASS(asettb);
198 static const AVFilterPad avfilter_af_asettb_inputs[] = {
201 .type = AVMEDIA_TYPE_AUDIO,
206 static const AVFilterPad avfilter_af_asettb_outputs[] = {
209 .type = AVMEDIA_TYPE_AUDIO,
210 .config_props = config_output_props,
215 const AVFilter ff_af_asettb = {
217 .description = NULL_IF_CONFIG_SMALL("Set timebase for the audio output link."),
218 .priv_size = sizeof(SetTBContext),
219 .inputs = avfilter_af_asettb_inputs,
220 .outputs = avfilter_af_asettb_outputs,
221 .priv_class = &asettb_class,
222 .activate = activate,
224 #endif /* CONFIG_ASETTB_FILTER */