h264_metadata: Add option to delete filler data
[libav.git] / libavfilter / setpts.c
1 /*
2 * Copyright (c) 2010 Stefano Sabatini
3 * Copyright (c) 2008 Victor Paesa
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * video presentation timestamp (PTS) modification filter
25 */
26
27 #include <inttypes.h>
28
29 #include "libavutil/eval.h"
30 #include "libavutil/internal.h"
31 #include "libavutil/mathematics.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/time.h"
34
35 #include "audio.h"
36 #include "avfilter.h"
37 #include "internal.h"
38 #include "video.h"
39
40 #include "config.h"
41
42 static const char *const var_names[] = {
43 "E", ///< Euler number
44 "FRAME_RATE", ///< defined only for constant frame-rate video
45 "INTERLACED", ///< tell if the current frame is interlaced
46 "N", ///< frame / sample number (starting at zero)
47 "PHI", ///< golden ratio
48 "PI", ///< Greek pi
49 "PREV_INPTS", ///< previous input PTS
50 "PREV_OUTPTS", ///< previous output PTS
51 "PTS", ///< original pts in the file of the frame
52 "STARTPTS", ///< PTS at start of movie
53 "TB", ///< timebase
54 "RTCTIME", ///< wallclock (RTC) time in micro seconds
55 "RTCSTART", ///< wallclock (RTC) time at the start of the movie in micro seconds
56 "S", // Number of samples in the current frame
57 "SR", // Audio sample rate
58 NULL
59 };
60
61 enum var_name {
62 VAR_E,
63 VAR_FRAME_RATE,
64 VAR_INTERLACED,
65 VAR_N,
66 VAR_PHI,
67 VAR_PI,
68 VAR_PREV_INPTS,
69 VAR_PREV_OUTPTS,
70 VAR_PTS,
71 VAR_STARTPTS,
72 VAR_TB,
73 VAR_RTCTIME,
74 VAR_RTCSTART,
75 VAR_S,
76 VAR_SR,
77 VAR_VARS_NB
78 };
79
80 typedef struct SetPTSContext {
81 const AVClass *class;
82 char *expr_str;
83 AVExpr *expr;
84 double var_values[VAR_VARS_NB];
85 } SetPTSContext;
86
87 static av_cold int init(AVFilterContext *ctx)
88 {
89 SetPTSContext *setpts = ctx->priv;
90 int ret;
91
92 if ((ret = av_expr_parse(&setpts->expr, setpts->expr_str,
93 var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
94 av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", setpts->expr_str);
95 return ret;
96 }
97
98 setpts->var_values[VAR_E] = M_E;
99 setpts->var_values[VAR_N] = 0.0;
100 setpts->var_values[VAR_S] = 0.0;
101 setpts->var_values[VAR_PHI] = M_PHI;
102 setpts->var_values[VAR_PI] = M_PI;
103 setpts->var_values[VAR_PREV_INPTS] = NAN;
104 setpts->var_values[VAR_PREV_OUTPTS] = NAN;
105 setpts->var_values[VAR_STARTPTS] = NAN;
106 return 0;
107 }
108
109 static int config_input(AVFilterLink *inlink)
110 {
111 SetPTSContext *setpts = inlink->dst->priv;
112
113 setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
114 setpts->var_values[VAR_RTCSTART] = av_gettime();
115
116 if (inlink->type == AVMEDIA_TYPE_AUDIO) {
117 setpts->var_values[VAR_SR] = inlink->sample_rate;
118 }
119
120 setpts->var_values[VAR_FRAME_RATE] = inlink->frame_rate.num &&
121 inlink->frame_rate.den ?
122 av_q2d(inlink->frame_rate) : NAN;
123
124 // Indicate the output can be variable framerate.
125 inlink->frame_rate = (AVRational){1, 0};
126
127 av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f\n", setpts->var_values[VAR_TB]);
128 return 0;
129 }
130
131 #define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
132 #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
133
134 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
135 {
136 SetPTSContext *setpts = inlink->dst->priv;
137 int64_t in_pts = frame->pts;
138 double d;
139
140 if (isnan(setpts->var_values[VAR_STARTPTS]))
141 setpts->var_values[VAR_STARTPTS] = TS2D(frame->pts);
142
143 setpts->var_values[VAR_PTS ] = TS2D(frame->pts);
144 setpts->var_values[VAR_RTCTIME ] = av_gettime();
145
146 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
147 setpts->var_values[VAR_INTERLACED] = frame->interlaced_frame;
148 } else {
149 setpts->var_values[VAR_S] = frame->nb_samples;
150 }
151
152 d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
153 frame->pts = D2TS(d);
154
155 av_log(inlink->dst, AV_LOG_TRACE,
156 "n:%"PRId64" interlaced:%d pts:%"PRId64" t:%f -> pts:%"PRId64" t:%f\n",
157 (int64_t)setpts->var_values[VAR_N],
158 (int)setpts->var_values[VAR_INTERLACED],
159 in_pts, in_pts * av_q2d(inlink->time_base),
160 frame->pts, frame->pts * av_q2d(inlink->time_base));
161
162 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
163 setpts->var_values[VAR_N] += 1.0;
164 } else {
165 setpts->var_values[VAR_N] += frame->nb_samples;
166 }
167
168 setpts->var_values[VAR_PREV_INPTS ] = TS2D(in_pts);
169 setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
170 return ff_filter_frame(inlink->dst->outputs[0], frame);
171 }
172
173 static av_cold void uninit(AVFilterContext *ctx)
174 {
175 SetPTSContext *setpts = ctx->priv;
176 av_expr_free(setpts->expr);
177 setpts->expr = NULL;
178 }
179
180 #define OFFSET(x) offsetof(SetPTSContext, x)
181 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM
182 static const AVOption options[] = {
183 { "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = FLAGS },
184 { NULL },
185 };
186
187 #if CONFIG_SETPTS_FILTER
188 static const AVClass setpts_class = {
189 .class_name = "setpts",
190 .item_name = av_default_item_name,
191 .option = options,
192 .version = LIBAVUTIL_VERSION_INT,
193 };
194
195 static const AVFilterPad avfilter_vf_setpts_inputs[] = {
196 {
197 .name = "default",
198 .type = AVMEDIA_TYPE_VIDEO,
199 .get_video_buffer = ff_null_get_video_buffer,
200 .config_props = config_input,
201 .filter_frame = filter_frame,
202 },
203 { NULL }
204 };
205
206 static const AVFilterPad avfilter_vf_setpts_outputs[] = {
207 {
208 .name = "default",
209 .type = AVMEDIA_TYPE_VIDEO,
210 },
211 { NULL }
212 };
213
214 AVFilter ff_vf_setpts = {
215 .name = "setpts",
216 .description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
217 .init = init,
218 .uninit = uninit,
219
220 .priv_size = sizeof(SetPTSContext),
221 .priv_class = &setpts_class,
222
223 .inputs = avfilter_vf_setpts_inputs,
224 .outputs = avfilter_vf_setpts_outputs,
225 };
226 #endif
227
228 #if CONFIG_ASETPTS_FILTER
229 static const AVClass asetpts_class = {
230 .class_name = "asetpts",
231 .item_name = av_default_item_name,
232 .option = options,
233 .version = LIBAVUTIL_VERSION_INT,
234 };
235
236 static const AVFilterPad asetpts_inputs[] = {
237 {
238 .name = "default",
239 .type = AVMEDIA_TYPE_AUDIO,
240 .get_audio_buffer = ff_null_get_audio_buffer,
241 .config_props = config_input,
242 .filter_frame = filter_frame,
243 },
244 { NULL }
245 };
246
247 static const AVFilterPad asetpts_outputs[] = {
248 {
249 .name = "default",
250 .type = AVMEDIA_TYPE_AUDIO,
251 },
252 { NULL }
253 };
254
255 AVFilter ff_af_asetpts = {
256 .name = "asetpts",
257 .description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),
258 .init = init,
259 .uninit = uninit,
260
261 .priv_size = sizeof(SetPTSContext),
262 .priv_class = &asetpts_class,
263
264 .inputs = asetpts_inputs,
265 .outputs = asetpts_outputs,
266 };
267 #endif