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 */