h264_metadata: Add option to delete filler data
[libav.git] / libavfilter / settb.c
1 /*
2 * Copyright (c) 2010 Stefano Sabatini
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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.
10 *
11 * Libav 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.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
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
26 #include <inttypes.h>
27 #include <stdio.h>
28
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"
35 #include "audio.h"
36 #include "avfilter.h"
37 #include "internal.h"
38 #include "video.h"
39
40 static const char *const var_names[] = {
41 "E",
42 "PHI",
43 "PI",
44 "AVTB", /* default timebase 1/AV_TIME_BASE */
45 "intb", /* input timebase */
46 "sr", /* sample rate */
47 NULL
48 };
49
50 enum var_name {
51 VAR_E,
52 VAR_PHI,
53 VAR_PI,
54 VAR_AVTB,
55 VAR_INTB,
56 VAR_SR,
57 VAR_VARS_NB
58 };
59
60 typedef struct SetTBContext {
61 const AVClass *class;
62 char *tb_expr;
63 double var_values[VAR_VARS_NB];
64 } SetTBContext;
65
66 static 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);
80 settb->var_values[VAR_SR] = inlink->sample_rate;
81
82 outlink->w = inlink->w;
83 outlink->h = inlink->h;
84
85 if ((ret = av_expr_parse_and_eval(&res, settb->tb_expr, var_names, settb->var_values,
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;
99 av_log(outlink->src, AV_LOG_VERBOSE, "tb:%d/%d -> tb:%d/%d\n",
100 inlink ->time_base.num, inlink ->time_base.den,
101 outlink->time_base.num, outlink->time_base.den);
102
103 return 0;
104 }
105
106 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
107 {
108 AVFilterContext *ctx = inlink->dst;
109 AVFilterLink *outlink = ctx->outputs[0];
110
111 if (av_cmp_q(inlink->time_base, outlink->time_base)) {
112 int64_t orig_pts = frame->pts;
113 frame->pts = av_rescale_q(frame->pts, inlink->time_base, outlink->time_base);
114 av_log(ctx, AV_LOG_DEBUG, "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n",
115 inlink ->time_base.num, inlink ->time_base.den, orig_pts,
116 outlink->time_base.num, outlink->time_base.den, frame->pts);
117 }
118
119 return ff_filter_frame(outlink, frame);
120 }
121
122 #define OFFSET(x) offsetof(SetTBContext, x)
123 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM
124 static 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
129 #if CONFIG_SETTB_FILTER
130 static 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
137 static const AVFilterPad avfilter_vf_settb_inputs[] = {
138 {
139 .name = "default",
140 .type = AVMEDIA_TYPE_VIDEO,
141 .get_video_buffer = ff_null_get_video_buffer,
142 .filter_frame = filter_frame,
143 },
144 { NULL }
145 };
146
147 static 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
156 AVFilter ff_vf_settb = {
157 .name = "settb",
158 .description = NULL_IF_CONFIG_SMALL("Set timebase for the video output link."),
159
160 .priv_size = sizeof(SetTBContext),
161 .priv_class = &settb_class,
162
163 .inputs = avfilter_vf_settb_inputs,
164
165 .outputs = avfilter_vf_settb_outputs,
166 };
167 #endif /* CONFIG_SETTB_FILTER */
168
169 #if CONFIG_ASETTB_FILTER
170 static 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
177 static 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
187 static 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
196 AVFilter 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 */