FFmpeg
f_cue.c
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1 /*
2  * Copyright (c) 2018 Marton Balint
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public License
8  * as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg 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
14  * GNU Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public License
17  * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/opt.h"
22 #include "libavutil/time.h"
23 #include "avfilter.h"
24 #include "filters.h"
25 #include "internal.h"
26 
27 typedef struct CueContext {
28  const AVClass *class;
29  int64_t first_pts;
30  int64_t cue;
31  int64_t preroll;
32  int64_t buffer;
33  int status;
34 } CueContext;
35 
37 {
38  AVFilterLink *inlink = ctx->inputs[0];
39  AVFilterLink *outlink = ctx->outputs[0];
40  CueContext *s = ctx->priv;
41 
42  FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
43 
44  if (ff_inlink_queued_frames(inlink)) {
45  AVFrame *frame = ff_inlink_peek_frame(inlink, 0);
46  int64_t pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q);
47 
48  if (!s->status) {
49  s->first_pts = pts;
50  s->status++;
51  }
52  if (s->status == 1) {
53  if (pts - s->first_pts < s->preroll) {
54  int ret = ff_inlink_consume_frame(inlink, &frame);
55  if (ret < 0)
56  return ret;
57  return ff_filter_frame(outlink, frame);
58  }
59  s->first_pts = pts;
60  s->status++;
61  }
62  if (s->status == 2) {
63  frame = ff_inlink_peek_frame(inlink, ff_inlink_queued_frames(inlink) - 1);
64  pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q);
65  if (!(pts - s->first_pts < s->buffer && (av_gettime() - s->cue) < 0))
66  s->status++;
67  }
68  if (s->status == 3) {
69  int64_t diff;
70  while ((diff = (av_gettime() - s->cue)) < 0)
71  av_usleep(av_clip(-diff / 2, 100, 1000000));
72  s->status++;
73  }
74  if (s->status == 4) {
75  int ret = ff_inlink_consume_frame(inlink, &frame);
76  if (ret < 0)
77  return ret;
78  return ff_filter_frame(outlink, frame);
79  }
80  }
81 
82  FF_FILTER_FORWARD_STATUS(inlink, outlink);
83  FF_FILTER_FORWARD_WANTED(outlink, inlink);
84 
85  return FFERROR_NOT_READY;
86 }
87 
88 #define OFFSET(x) offsetof(CueContext, x)
89 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
90 static const AVOption options[] = {
91  { "cue", "cue unix timestamp in microseconds", OFFSET(cue), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
92  { "preroll", "preroll duration in seconds", OFFSET(preroll), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
93  { "buffer", "buffer duration in seconds", OFFSET(buffer), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
94  { NULL }
95 };
96 
97 #if CONFIG_CUE_FILTER
98 #define cue_options options
100 
101 static const AVFilterPad cue_inputs[] = {
102  {
103  .name = "default",
104  .type = AVMEDIA_TYPE_VIDEO,
105  },
106  { NULL }
107 };
108 
109 static const AVFilterPad cue_outputs[] = {
110  {
111  .name = "default",
112  .type = AVMEDIA_TYPE_VIDEO,
113  },
114  { NULL }
115 };
116 
118  .name = "cue",
119  .description = NULL_IF_CONFIG_SMALL("Delay filtering to match a cue."),
120  .priv_size = sizeof(CueContext),
121  .priv_class = &cue_class,
122  .inputs = cue_inputs,
123  .outputs = cue_outputs,
124  .activate = activate,
125 };
126 #endif /* CONFIG_CUE_FILTER */
127 
128 #if CONFIG_ACUE_FILTER
129 #define acue_options options
131 
132 static const AVFilterPad acue_inputs[] = {
133  {
134  .name = "default",
135  .type = AVMEDIA_TYPE_AUDIO,
136  },
137  { NULL }
138 };
139 
140 static const AVFilterPad acue_outputs[] = {
141  {
142  .name = "default",
143  .type = AVMEDIA_TYPE_AUDIO,
144  },
145  { NULL }
146 };
147 
149  .name = "acue",
150  .description = NULL_IF_CONFIG_SMALL("Delay filtering to match a cue."),
151  .priv_size = sizeof(CueContext),
152  .priv_class = &acue_class,
153  .inputs = acue_inputs,
154  .outputs = acue_outputs,
155  .activate = activate,
156 };
157 #endif /* CONFIG_ACUE_FILTER */
int64_t cue
Definition: f_cue.c:30
int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe)
Take a frame from the link&#39;s FIFO and update the link&#39;s stats.
Definition: avfilter.c:1494
#define NULL
Definition: coverity.c:32
#define OFFSET(x)
Definition: f_cue.c:88
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
AVOption.
Definition: opt.h:246
Main libavfilter public API header.
AVFilter ff_af_acue
FF_FILTER_FORWARD_STATUS(inlink, outlink)
int av_usleep(unsigned usec)
Sleep for a period of time.
Definition: time.c:84
return FFERROR_NOT_READY
const char * name
Pad name.
Definition: internal.h:60
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:346
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1093
AVOptions.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:388
AVFilter ff_vf_cue
#define FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink)
Forward the status on an output link to an input link.
Definition: filters.h:199
A filter pad used for either input or output.
Definition: internal.h:54
#define FLAGS
Definition: f_cue.c:89
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
void * priv
private data for use by the filter
Definition: avfilter.h:353
int64_t first_pts
Definition: f_cue.c:29
static const AVOption options[]
Definition: f_cue.c:90
static int activate(AVFilterContext *ctx)
Definition: f_cue.c:36
AVFormatContext * ctx
Definition: movenc.c:48
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
#define s(width, name)
Definition: cbs_vp9.c:257
AVFrame * ff_inlink_peek_frame(AVFilterLink *link, size_t idx)
Access a frame in the link fifo without consuming it.
Definition: avfilter.c:1533
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
int64_t av_gettime(void)
Get the current time in microseconds.
Definition: time.c:39
int64_t buffer
Definition: f_cue.c:32
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
int64_t preroll
Definition: f_cue.c:31
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
const char * name
Filter name.
Definition: avfilter.h:148
size_t ff_inlink_queued_frames(AVFilterLink *link)
Get the number of frames available on the link.
Definition: avfilter.c:1464
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
int status
Definition: f_cue.c:33
static int64_t pts
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
FF_FILTER_FORWARD_WANTED(outlink, inlink)
static av_always_inline int diff(const uint32_t a, const uint32_t b)
#define AVFILTER_DEFINE_CLASS(fname)
Definition: internal.h:334
An instance of a filter.
Definition: avfilter.h:338
internal API functions
GLuint buffer
Definition: opengl_enc.c:101