Libav
setpts.c
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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 
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",
44  "INTERLACED",
45  "N",
46  "PHI",
47  "PI",
48  "PREV_INPTS",
49  "PREV_OUTPTS",
50  "PTS",
51  "STARTPTS",
52  "TB",
53  "RTCTIME",
54  "RTCSTART",
55  "S", // Number of samples in the current frame
56  "SR", // Audio sample rate
57  NULL
58 };
59 
60 enum var_name {
76 };
77 
78 typedef struct SetPTSContext {
79  const AVClass *class;
80  char *expr_str;
84 
85 static av_cold int init(AVFilterContext *ctx)
86 {
87  SetPTSContext *setpts = ctx->priv;
88  int ret;
89 
90  if ((ret = av_expr_parse(&setpts->expr, setpts->expr_str,
91  var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
92  av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", setpts->expr_str);
93  return ret;
94  }
95 
96  setpts->var_values[VAR_E] = M_E;
97  setpts->var_values[VAR_N] = 0.0;
98  setpts->var_values[VAR_S] = 0.0;
99  setpts->var_values[VAR_PHI] = M_PHI;
100  setpts->var_values[VAR_PI] = M_PI;
101  setpts->var_values[VAR_PREV_INPTS] = NAN;
102  setpts->var_values[VAR_PREV_OUTPTS] = NAN;
103  setpts->var_values[VAR_STARTPTS] = NAN;
104  return 0;
105 }
106 
107 static int config_input(AVFilterLink *inlink)
108 {
109  SetPTSContext *setpts = inlink->dst->priv;
110 
111  setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
112  setpts->var_values[VAR_RTCSTART] = av_gettime();
113 
114  if (inlink->type == AVMEDIA_TYPE_AUDIO) {
115  setpts->var_values[VAR_SR] = inlink->sample_rate;
116  }
117 
118  av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f\n", setpts->var_values[VAR_TB]);
119  return 0;
120 }
121 
122 #define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
123 #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
124 
125 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
126 {
127  SetPTSContext *setpts = inlink->dst->priv;
128  int64_t in_pts = frame->pts;
129  double d;
130 
131  if (isnan(setpts->var_values[VAR_STARTPTS]))
132  setpts->var_values[VAR_STARTPTS] = TS2D(frame->pts);
133 
134  setpts->var_values[VAR_PTS ] = TS2D(frame->pts);
135  setpts->var_values[VAR_RTCTIME ] = av_gettime();
136 
137  if (inlink->type == AVMEDIA_TYPE_VIDEO) {
138  setpts->var_values[VAR_INTERLACED] = frame->interlaced_frame;
139  } else {
140  setpts->var_values[VAR_S] = frame->nb_samples;
141  }
142 
143  d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
144  frame->pts = D2TS(d);
145 
146  av_dlog(inlink->dst,
147  "n:%"PRId64" interlaced:%d pts:%"PRId64" t:%f -> pts:%"PRId64" t:%f\n",
148  (int64_t)setpts->var_values[VAR_N],
149  (int)setpts->var_values[VAR_INTERLACED],
150  in_pts, in_pts * av_q2d(inlink->time_base),
151  frame->pts, frame->pts * av_q2d(inlink->time_base));
152 
153  if (inlink->type == AVMEDIA_TYPE_VIDEO) {
154  setpts->var_values[VAR_N] += 1.0;
155  } else {
156  setpts->var_values[VAR_N] += frame->nb_samples;
157  }
158 
159  setpts->var_values[VAR_PREV_INPTS ] = TS2D(in_pts);
160  setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
161  return ff_filter_frame(inlink->dst->outputs[0], frame);
162 }
163 
164 static av_cold void uninit(AVFilterContext *ctx)
165 {
166  SetPTSContext *setpts = ctx->priv;
167  av_expr_free(setpts->expr);
168  setpts->expr = NULL;
169 }
170 
171 #define OFFSET(x) offsetof(SetPTSContext, x)
172 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM
173 static const AVOption options[] = {
174  { "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = FLAGS },
175  { NULL },
176 };
177 
178 #if CONFIG_SETPTS_FILTER
179 static const AVClass setpts_class = {
180  .class_name = "setpts",
181  .item_name = av_default_item_name,
182  .option = options,
183  .version = LIBAVUTIL_VERSION_INT,
184 };
185 
186 static const AVFilterPad avfilter_vf_setpts_inputs[] = {
187  {
188  .name = "default",
189  .type = AVMEDIA_TYPE_VIDEO,
190  .get_video_buffer = ff_null_get_video_buffer,
191  .config_props = config_input,
192  .filter_frame = filter_frame,
193  },
194  { NULL }
195 };
196 
197 static const AVFilterPad avfilter_vf_setpts_outputs[] = {
198  {
199  .name = "default",
200  .type = AVMEDIA_TYPE_VIDEO,
201  },
202  { NULL }
203 };
204 
205 AVFilter ff_vf_setpts = {
206  .name = "setpts",
207  .description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
208  .init = init,
209  .uninit = uninit,
210 
211  .priv_size = sizeof(SetPTSContext),
212  .priv_class = &setpts_class,
213 
214  .inputs = avfilter_vf_setpts_inputs,
215  .outputs = avfilter_vf_setpts_outputs,
216 };
217 #endif
218 
219 #if CONFIG_ASETPTS_FILTER
220 static const AVClass asetpts_class = {
221  .class_name = "asetpts",
222  .item_name = av_default_item_name,
223  .option = options,
224  .version = LIBAVUTIL_VERSION_INT,
225 };
226 
227 static const AVFilterPad asetpts_inputs[] = {
228  {
229  .name = "default",
230  .type = AVMEDIA_TYPE_AUDIO,
231  .get_audio_buffer = ff_null_get_audio_buffer,
232  .config_props = config_input,
233  .filter_frame = filter_frame,
234  },
235  { NULL }
236 };
237 
238 static const AVFilterPad asetpts_outputs[] = {
239  {
240  .name = "default",
241  .type = AVMEDIA_TYPE_AUDIO,
242  },
243  { NULL }
244 };
245 
246 AVFilter ff_af_asetpts = {
247  .name = "asetpts",
248  .description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),
249  .init = init,
250  .uninit = uninit,
251 
252  .priv_size = sizeof(SetPTSContext),
253  .priv_class = &asetpts_class,
254 
255  .inputs = asetpts_inputs,
256  .outputs = asetpts_outputs,
257 };
258 #endif
static const char *const var_names[]
Definition: setpts.c:42
Definition: setpts.c:61
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
AVOption.
Definition: opt.h:234
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:232
Main libavfilter public API header.
static int config_input(AVFilterLink *inlink)
Definition: setpts.c:107
AVFrame * ff_null_get_video_buffer(AVFilterLink *link, int w, int h)
Definition: video.c:30
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
double var_values[VAR_VARS_NB]
Definition: setpts.c:82
int av_expr_parse(AVExpr **expr, const char *s, const char *const *const_names, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), int log_offset, void *log_ctx)
Parse an expression.
Definition: eval.c:492
const char * name
Pad name.
Definition: internal.h:42
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:38
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:728
#define av_cold
Definition: attributes.h:66
AVOptions.
static av_always_inline av_const int isnan(float x)
Definition: libm.h:85
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:211
Definition: eval.c:128
static double av_q2d(AVRational a)
Convert rational to double.
Definition: rational.h:69
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:139
int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:320
Definition: setpts.c:63
A filter pad used for either input or output.
Definition: internal.h:36
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
Definition: setpts.c:70
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
void * priv
private data for use by the filter
Definition: avfilter.h:584
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
common internal API header
static const AVOption options[]
Definition: setpts.c:173
Definition: setpts.c:73
#define M_E
Definition: ratecontrol.c:39
char * expr_str
Definition: setpts.c:80
#define D2TS(d)
Definition: setpts.c:122
AVFrame * ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples)
get_audio_buffer() handler for filters which simply pass audio along
Definition: audio.c:26
LIBAVUTIL_VERSION_INT
Definition: eval.c:55
static av_cold void uninit(AVFilterContext *ctx)
Definition: setpts.c:164
int64_t av_gettime(void)
Get the current time in microseconds.
Definition: time.c:37
NULL
Definition: eval.c:55
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:195
av_default_item_name
Definition: dnxhdenc.c:52
Describe the class of an AVClass context structure.
Definition: log.h:33
Filter definition.
Definition: avfilter.h:421
static const AVFilterPad inputs[]
Definition: af_ashowinfo.c:221
#define TS2D(ts)
Definition: setpts.c:123
#define M_PHI
Definition: mathematics.h:34
const char * name
Filter name.
Definition: avfilter.h:425
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:578
Definition: setpts.c:65
Definition: setpts.c:74
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: setpts.c:125
#define OFFSET(x)
Definition: setpts.c:171
#define NAN
Definition: math.h:28
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:542
An instance of a filter.
Definition: avfilter.h:563
AVExpr * expr
Definition: setpts.c:81
#define FLAGS
Definition: setpts.c:172
Definition: setpts.c:64
internal API functions
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:179
static av_cold int init(AVFilterContext *ctx)
Definition: setpts.c:85
Definition: setpts.c:68
var_name
Definition: setpts.c:60
simple arithmetic expression evaluator