mpegvideo: operate with pointers to AVFrames instead of whole structs
[libav.git] / libavfilter / settb.c
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214c0d42 1/*
3fa77bde 2 * Copyright (c) 2010 Stefano Sabatini
214c0d42 3 *
2912e87a 4 * This file is part of Libav.
214c0d42 5 *
2912e87a 6 * Libav is free software; you can redistribute it and/or
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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.
10 *
2912e87a 11 * Libav is distributed in the hope that it will be useful,
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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.
15 *
16 * You should have received a copy of the GNU Lesser General Public
2912e87a 17 * License along with Libav; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
22 * @file
23 * Set timebase for the output link.
24 */
25
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26#include <inttypes.h>
27#include <stdio.h>
28
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29#include "libavutil/avstring.h"
30#include "libavutil/eval.h"
1d9c2dc8 31#include "libavutil/internal.h"
0ebcdf5c 32#include "libavutil/mathematics.h"
ffea3b00 33#include "libavutil/opt.h"
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34#include "libavutil/rational.h"
35#include "avfilter.h"
36#include "internal.h"
c04c533f 37#include "video.h"
214c0d42 38
b0f29db5 39static const char *const var_names[] = {
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40 "E",
41 "PHI",
42 "PI",
43 "AVTB", /* default timebase 1/AV_TIME_BASE */
44 "intb", /* input timebase */
45 NULL
46};
47
48enum var_name {
49 VAR_E,
50 VAR_PHI,
51 VAR_PI,
52 VAR_AVTB,
53 VAR_INTB,
54 VAR_VARS_NB
55};
56
57typedef struct {
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58 const AVClass *class;
59 char *tb_expr;
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60 double var_values[VAR_VARS_NB];
61} SetTBContext;
62
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63static int config_output_props(AVFilterLink *outlink)
64{
65 AVFilterContext *ctx = outlink->src;
66 SetTBContext *settb = ctx->priv;
67 AVFilterLink *inlink = ctx->inputs[0];
68 AVRational time_base;
69 int ret;
70 double res;
71
72 settb->var_values[VAR_E] = M_E;
73 settb->var_values[VAR_PHI] = M_PHI;
74 settb->var_values[VAR_PI] = M_PI;
75 settb->var_values[VAR_AVTB] = av_q2d(AV_TIME_BASE_Q);
76 settb->var_values[VAR_INTB] = av_q2d(inlink->time_base);
77
78 outlink->w = inlink->w;
79 outlink->h = inlink->h;
80
d2af7205 81 if ((ret = av_expr_parse_and_eval(&res, settb->tb_expr, var_names, settb->var_values,
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82 NULL, NULL, NULL, NULL, NULL, 0, NULL)) < 0) {
83 av_log(ctx, AV_LOG_ERROR, "Invalid expression '%s' for timebase.\n", settb->tb_expr);
84 return ret;
85 }
86 time_base = av_d2q(res, INT_MAX);
87 if (time_base.num <= 0 || time_base.den <= 0) {
88 av_log(ctx, AV_LOG_ERROR,
89 "Invalid non-positive values for the timebase num:%d or den:%d.\n",
90 time_base.num, time_base.den);
91 return AVERROR(EINVAL);
92 }
93
94 outlink->time_base = time_base;
1a49a169 95 av_log(outlink->src, AV_LOG_VERBOSE, "tb:%d/%d -> tb:%d/%d\n",
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96 inlink ->time_base.num, inlink ->time_base.den,
97 outlink->time_base.num, outlink->time_base.den);
98
99 return 0;
100}
101
7e350379 102static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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103{
104 AVFilterContext *ctx = inlink->dst;
105 AVFilterLink *outlink = ctx->outputs[0];
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106
107 if (av_cmp_q(inlink->time_base, outlink->time_base)) {
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108 int64_t orig_pts = frame->pts;
109 frame->pts = av_rescale_q(frame->pts, inlink->time_base, outlink->time_base);
214c0d42 110 av_log(ctx, AV_LOG_DEBUG, "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n",
0393af4f 111 inlink ->time_base.num, inlink ->time_base.den, orig_pts,
565e4993 112 outlink->time_base.num, outlink->time_base.den, frame->pts);
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113 }
114
565e4993 115 return ff_filter_frame(outlink, frame);
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116}
117
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118#define OFFSET(x) offsetof(SetTBContext, x)
119#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
120static const AVOption options[] = {
121 { "expr", "Expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, { .str = "intb" }, .flags = FLAGS },
122 { NULL },
123};
124
125static const AVClass settb_class = {
126 .class_name = "settb",
127 .item_name = av_default_item_name,
128 .option = options,
129 .version = LIBAVUTIL_VERSION_INT,
130};
131
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132static const AVFilterPad avfilter_vf_settb_inputs[] = {
133 {
134 .name = "default",
135 .type = AVMEDIA_TYPE_VIDEO,
136 .get_video_buffer = ff_null_get_video_buffer,
565e4993 137 .filter_frame = filter_frame,
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138 },
139 { NULL }
140};
141
142static const AVFilterPad avfilter_vf_settb_outputs[] = {
143 {
144 .name = "default",
145 .type = AVMEDIA_TYPE_VIDEO,
146 .config_props = config_output_props,
147 },
148 { NULL }
149};
150
cd43ca04 151AVFilter ff_vf_settb = {
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152 .name = "settb",
153 .description = NULL_IF_CONFIG_SMALL("Set timebase for the output link."),
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154
155 .priv_size = sizeof(SetTBContext),
ffea3b00 156 .priv_class = &settb_class,
214c0d42 157
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158 .inputs = avfilter_vf_settb_inputs,
159
160 .outputs = avfilter_vf_settb_outputs,
214c0d42 161};