FFmpeg
vf_shuffleframes.c
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1 /*
2  * Copyright (c) 2015 Paul B Mahol
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
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  * 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 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 FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/avassert.h"
22 #include "libavutil/avstring.h"
23 #include "libavutil/common.h"
24 #include "libavutil/internal.h"
25 #include "libavutil/opt.h"
26 
27 #include "avfilter.h"
28 #include "internal.h"
29 #include "video.h"
30 
31 typedef struct ShuffleFramesContext {
32  const AVClass *class;
33  char *mapping;
35  int *map;
36  int64_t *pts;
37  int in_frames;
38  int nb_frames;
40 
42 {
43  ShuffleFramesContext *s = ctx->priv;
44  char *mapping, *saveptr = NULL, *p;
45  int n, nb_items;
46 
47  nb_items = 1;
48  for (p = s->mapping; *p; p++) {
49  if (*p == '|' || *p == ' ')
50  nb_items++;
51  }
52 
53  s->frames = av_calloc(nb_items, sizeof(*s->frames));
54  s->map = av_calloc(nb_items, sizeof(*s->map));
55  s->pts = av_calloc(nb_items, sizeof(*s->pts));
56  if (!s->map || !s->frames || !s->pts) {
57  return AVERROR(ENOMEM);
58  }
59 
60  mapping = av_strdup(s->mapping);
61  if (!mapping)
62  return AVERROR(ENOMEM);
63 
64  for (n = 0; n < nb_items; n++) {
65  char *map = av_strtok(n == 0 ? mapping : NULL, " |", &saveptr);
66  if (!map || sscanf(map, "%d", &s->map[n]) != 1) {
67  av_free(mapping);
68  return AVERROR(EINVAL);
69  }
70 
71  if (s->map[n] < -1 || s->map[n] >= nb_items) {
72  av_log(ctx, AV_LOG_ERROR, "Index out of range.\n");
73  av_free(mapping);
74  return AVERROR(EINVAL);
75  }
76  }
77 
78  s->nb_frames = nb_items;
79  av_free(mapping);
80  return 0;
81 }
82 
84 {
85  AVFilterContext *ctx = inlink->dst;
86  ShuffleFramesContext *s = ctx->priv;
87  int ret = 0;
88 
89  if (s->in_frames < s->nb_frames) {
90  s->frames[s->in_frames] = frame;
91  s->pts[s->in_frames] = frame->pts;
92  s->in_frames++;
93  }
94 
95  if (s->in_frames == s->nb_frames) {
96  int n, x;
97 
98  for (n = 0; n < s->nb_frames; n++) {
99  AVFrame *out;
100 
101  x = s->map[n];
102  if (x >= 0) {
103  out = av_frame_clone(s->frames[x]);
104  if (!out)
105  return AVERROR(ENOMEM);
106  out->pts = s->pts[n];
107  ret = ff_filter_frame(ctx->outputs[0], out);
108  }
109  s->in_frames--;
110  }
111 
112  for (n = 0; n < s->nb_frames; n++)
113  av_frame_free(&s->frames[n]);
114  }
115 
116  return ret;
117 }
118 
120 {
121  ShuffleFramesContext *s = ctx->priv;
122 
123  while (s->in_frames > 0) {
124  s->in_frames--;
125  av_frame_free(&s->frames[s->in_frames]);
126  }
127 
128  av_freep(&s->frames);
129  av_freep(&s->map);
130  av_freep(&s->pts);
131 }
132 
133 #define OFFSET(x) offsetof(ShuffleFramesContext, x)
134 #define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
135 static const AVOption shuffleframes_options[] = {
136  { "mapping", "set destination indexes of input frames", OFFSET(mapping), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
137  { NULL },
138 };
139 
140 AVFILTER_DEFINE_CLASS(shuffleframes);
141 
143  {
144  .name = "default",
145  .type = AVMEDIA_TYPE_VIDEO,
146  .filter_frame = filter_frame,
147  },
148  { NULL },
149 };
150 
152  {
153  .name = "default",
154  .type = AVMEDIA_TYPE_VIDEO,
155  },
156  { NULL },
157 };
158 
160  .name = "shuffleframes",
161  .description = NULL_IF_CONFIG_SMALL("Shuffle video frames."),
162  .priv_size = sizeof(ShuffleFramesContext),
163  .priv_class = &shuffleframes_class,
164  .init = init,
165  .uninit = uninit,
166  .inputs = shuffleframes_inputs,
167  .outputs = shuffleframes_outputs,
169 };
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
AVOption.
Definition: opt.h:246
Main libavfilter public API header.
static const AVOption shuffleframes_options[]
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:244
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:125
const char * name
Pad name.
Definition: internal.h:60
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1080
#define av_cold
Definition: attributes.h:82
AVOptions.
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:388
#define av_log(a,...)
A filter pad used for either input or output.
Definition: internal.h:54
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
#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
simple assert() macros that are a bit more flexible than ISO C assert().
common internal API header
static const AVFilterPad shuffleframes_outputs[]
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
int n
Definition: avisynth_c.h:760
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:540
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
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
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static const AVFilterPad shuffleframes_inputs[]
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
char * av_strtok(char *s, const char *delim, char **saveptr)
Split the string into several tokens which can be accessed by successive calls to av_strtok()...
Definition: avstring.c:184
#define OFFSET(x)
common internal and external API header
static av_cold void uninit(AVFilterContext *ctx)
#define av_free(p)
An instance of a filter.
Definition: avfilter.h:338
FILE * out
Definition: movenc.c:54
#define av_freep(p)
#define FLAGS
static av_cold int init(AVFilterContext *ctx)
internal API functions
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
AVFILTER_DEFINE_CLASS(shuffleframes)
AVFilter ff_vf_shuffleframes