h264_metadata: Add option to delete filler data
[libav.git] / libavfilter / settb.c
CommitLineData
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"
214c0d42 34#include "libavutil/rational.h"
ad8159e0 35#include "audio.h"
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36#include "avfilter.h"
37#include "internal.h"
c04c533f 38#include "video.h"
214c0d42 39
b0f29db5 40static const char *const var_names[] = {
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41 "E",
42 "PHI",
43 "PI",
44 "AVTB", /* default timebase 1/AV_TIME_BASE */
45 "intb", /* input timebase */
ad8159e0 46 "sr", /* sample rate */
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47 NULL
48};
49
50enum var_name {
51 VAR_E,
52 VAR_PHI,
53 VAR_PI,
54 VAR_AVTB,
55 VAR_INTB,
ad8159e0 56 VAR_SR,
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57 VAR_VARS_NB
58};
59
58400ac1 60typedef struct SetTBContext {
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61 const AVClass *class;
62 char *tb_expr;
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63 double var_values[VAR_VARS_NB];
64} SetTBContext;
65
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66static int config_output_props(AVFilterLink *outlink)
67{
68 AVFilterContext *ctx = outlink->src;
69 SetTBContext *settb = ctx->priv;
70 AVFilterLink *inlink = ctx->inputs[0];
71 AVRational time_base;
72 int ret;
73 double res;
74
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);
ad8159e0 80 settb->var_values[VAR_SR] = inlink->sample_rate;
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81
82 outlink->w = inlink->w;
83 outlink->h = inlink->h;
84
d2af7205 85 if ((ret = av_expr_parse_and_eval(&res, settb->tb_expr, var_names, settb->var_values,
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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);
88 return ret;
89 }
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);
96 }
97
98 outlink->time_base = time_base;
1a49a169 99 av_log(outlink->src, AV_LOG_VERBOSE, "tb:%d/%d -> tb:%d/%d\n",
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100 inlink ->time_base.num, inlink ->time_base.den,
101 outlink->time_base.num, outlink->time_base.den);
102
103 return 0;
104}
105
7e350379 106static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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107{
108 AVFilterContext *ctx = inlink->dst;
109 AVFilterLink *outlink = ctx->outputs[0];
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110
111 if (av_cmp_q(inlink->time_base, outlink->time_base)) {
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112 int64_t orig_pts = frame->pts;
113 frame->pts = av_rescale_q(frame->pts, inlink->time_base, outlink->time_base);
214c0d42 114 av_log(ctx, AV_LOG_DEBUG, "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n",
0393af4f 115 inlink ->time_base.num, inlink ->time_base.den, orig_pts,
565e4993 116 outlink->time_base.num, outlink->time_base.den, frame->pts);
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117 }
118
565e4993 119 return ff_filter_frame(outlink, frame);
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120}
121
ffea3b00 122#define OFFSET(x) offsetof(SetTBContext, x)
ad8159e0 123#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM
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124static const AVOption options[] = {
125 { "expr", "Expression determining the output timebase", OFFSET(tb_expr), AV_OPT_TYPE_STRING, { .str = "intb" }, .flags = FLAGS },
126 { NULL },
127};
128
ad8159e0 129#if CONFIG_SETTB_FILTER
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130static const AVClass settb_class = {
131 .class_name = "settb",
132 .item_name = av_default_item_name,
133 .option = options,
134 .version = LIBAVUTIL_VERSION_INT,
135};
136
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137static const AVFilterPad avfilter_vf_settb_inputs[] = {
138 {
139 .name = "default",
140 .type = AVMEDIA_TYPE_VIDEO,
141 .get_video_buffer = ff_null_get_video_buffer,
565e4993 142 .filter_frame = filter_frame,
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143 },
144 { NULL }
145};
146
147static const AVFilterPad avfilter_vf_settb_outputs[] = {
148 {
149 .name = "default",
150 .type = AVMEDIA_TYPE_VIDEO,
151 .config_props = config_output_props,
152 },
153 { NULL }
154};
155
cd43ca04 156AVFilter ff_vf_settb = {
214c0d42 157 .name = "settb",
ad8159e0 158 .description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."),
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159
160 .priv_size = sizeof(SetTBContext),
ffea3b00 161 .priv_class = &settb_class,
214c0d42 162
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163 .inputs = avfilter_vf_settb_inputs,
164
165 .outputs = avfilter_vf_settb_outputs,
214c0d42 166};
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167#endif /* CONFIG_SETTB_FILTER */
168
169#if CONFIG_ASETTB_FILTER
170static const AVClass asettb_class = {
171 .class_name = "asettb",
172 .item_name = av_default_item_name,
173 .option = options,
174 .version = LIBAVUTIL_VERSION_INT,
175};
176
177static const AVFilterPad avfilter_af_asettb_inputs[] = {
178 {
179 .name = "default",
180 .type = AVMEDIA_TYPE_AUDIO,
181 .get_audio_buffer = ff_null_get_audio_buffer,
182 .filter_frame = filter_frame,
183 },
184 { NULL }
185};
186
187static const AVFilterPad avfilter_af_asettb_outputs[] = {
188 {
189 .name = "default",
190 .type = AVMEDIA_TYPE_AUDIO,
191 .config_props = config_output_props,
192 },
193 { NULL }
194};
195
196AVFilter ff_af_asettb = {
197 .name = "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,
203};
204#endif /* CONFIG_ASETTB_FILTER */