FFmpeg  4.4.6
split.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2007 Bobby Bingham
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 /**
22  * @file
23  * audio and video splitter
24  */
25 
26 #include <stdio.h>
27 
28 #include "libavutil/attributes.h"
29 #include "libavutil/avstring.h"
30 #include "libavutil/internal.h"
31 #include "libavutil/mem.h"
32 #include "libavutil/opt.h"
33 
34 #include "avfilter.h"
35 #include "audio.h"
36 #include "filters.h"
37 #include "formats.h"
38 #include "internal.h"
39 #include "video.h"
40 
41 typedef struct SplitContext {
42  const AVClass *class;
44 } SplitContext;
45 
47 {
48  SplitContext *s = ctx->priv;
49  int i, ret;
50 
51  for (i = 0; i < s->nb_outputs; i++) {
52  AVFilterPad pad = { 0 };
53 
54  pad.type = ctx->filter->inputs[0].type;
55  pad.name = av_asprintf("output%d", i);
56  if (!pad.name)
57  return AVERROR(ENOMEM);
58 
59  if ((ret = ff_insert_outpad(ctx, i, &pad)) < 0) {
60  av_freep(&pad.name);
61  return ret;
62  }
63  }
64 
65  return 0;
66 }
67 
69 {
70  int i;
71 
72  for (i = 0; i < ctx->nb_outputs; i++)
73  av_freep(&ctx->output_pads[i].name);
74 }
75 
76 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
77 {
78  AVFilterContext *ctx = inlink->dst;
79  int i, ret = AVERROR_EOF;
80 
81  for (i = 0; i < ctx->nb_outputs; i++) {
82  AVFrame *buf_out;
83 
84  if (ff_outlink_get_status(ctx->outputs[i]))
85  continue;
86  buf_out = av_frame_clone(frame);
87  if (!buf_out) {
88  ret = AVERROR(ENOMEM);
89  break;
90  }
91 
92  ret = ff_filter_frame(ctx->outputs[i], buf_out);
93  if (ret < 0)
94  break;
95  }
97  return ret;
98 }
99 
100 #define OFFSET(x) offsetof(SplitContext, x)
101 #define FLAGS (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM)
102 static const AVOption options[] = {
103  { "outputs", "set number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, FLAGS },
104  { NULL }
105 };
106 
107 #define split_options options
109 
110 #define asplit_options options
112 
114  {
115  .name = "default",
116  .type = AVMEDIA_TYPE_VIDEO,
117  .filter_frame = filter_frame,
118  },
119  { NULL }
120 };
121 
123  .name = "split",
124  .description = NULL_IF_CONFIG_SMALL("Pass on the input to N video outputs."),
125  .priv_size = sizeof(SplitContext),
126  .priv_class = &split_class,
127  .init = split_init,
128  .uninit = split_uninit,
130  .outputs = NULL,
132 };
133 
135  {
136  .name = "default",
137  .type = AVMEDIA_TYPE_AUDIO,
138  .filter_frame = filter_frame,
139  },
140  { NULL }
141 };
142 
144  .name = "asplit",
145  .description = NULL_IF_CONFIG_SMALL("Pass on the audio input to N audio outputs."),
146  .priv_size = sizeof(SplitContext),
147  .priv_class = &asplit_class,
148  .init = split_init,
149  .uninit = split_uninit,
151  .outputs = NULL,
153 };
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
static char * split(char *message, char delim)
Definition: af_channelmap.c:81
Macro definitions for various function/variable attributes.
#define av_cold
Definition: attributes.h:88
int ff_outlink_get_status(AVFilterLink *link)
Get the status on an output link.
Definition: avfilter.c:1643
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1096
Main libavfilter public API header.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:113
#define flags(name, subs,...)
Definition: cbs_av1.c:572
#define s(width, name)
Definition: cbs_vp9.c:257
#define NULL
Definition: coverity.c:32
static av_cold int uninit(AVCodecContext *avctx)
Definition: crystalhd.c:279
static AVFrame * frame
@ AV_OPT_TYPE_INT
Definition: opt.h:225
#define AVFILTER_FLAG_DYNAMIC_OUTPUTS
The number of the filter outputs is not determined just by AVFilter.outputs.
Definition: avfilter.h:112
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:540
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
int i
Definition: input.c:407
static int ff_insert_outpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new output pad for the filter.
Definition: internal.h:248
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
Memory handling functions.
AVOptions.
AVFilter ff_vf_split
Definition: split.c:122
static const AVOption options[]
Definition: split.c:102
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: split.c:76
#define FLAGS
Definition: split.c:101
static av_cold int split_init(AVFilterContext *ctx)
Definition: split.c:46
static const AVFilterPad avfilter_af_asplit_inputs[]
Definition: split.c:134
AVFilter ff_af_asplit
Definition: split.c:143
#define OFFSET(x)
Definition: split.c:100
static const AVFilterPad avfilter_vf_split_inputs[]
Definition: split.c:113
static av_cold void split_uninit(AVFilterContext *ctx)
Definition: split.c:68
AVFILTER_DEFINE_CLASS(split)
Describe the class of an AVClass context structure.
Definition: log.h:67
An instance of a filter.
Definition: avfilter.h:341
A filter pad used for either input or output.
Definition: internal.h:54
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:65
const char * name
Pad name.
Definition: internal.h:60
Filter definition.
Definition: avfilter.h:145
const char * name
Filter name.
Definition: avfilter.h:149
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
AVOption.
Definition: opt.h:248
int nb_outputs
Definition: split.c:43
#define av_freep(p)
AVFormatContext * ctx
Definition: movenc.c:48