Libav
split.c
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1 /*
2  * Copyright (c) 2007 Bobby Bingham
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
26 #include <stdio.h>
27 
28 #include "libavutil/attributes.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/mem.h"
31 #include "libavutil/opt.h"
32 
33 #include "avfilter.h"
34 #include "audio.h"
35 #include "internal.h"
36 #include "video.h"
37 
38 typedef struct SplitContext {
39  const AVClass *class;
41 } SplitContext;
42 
44 {
45  SplitContext *s = ctx->priv;
46  int i;
47 
48  for (i = 0; i < s->nb_outputs; i++) {
49  char name[32];
50  AVFilterPad pad = { 0 };
51 
52  snprintf(name, sizeof(name), "output%d", i);
53  pad.type = ctx->filter->inputs[0].type;
54  pad.name = av_strdup(name);
55 
56  ff_insert_outpad(ctx, i, &pad);
57  }
58 
59  return 0;
60 }
61 
63 {
64  int i;
65 
66  for (i = 0; i < ctx->nb_outputs; i++)
67  av_freep(&ctx->output_pads[i].name);
68 }
69 
70 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
71 {
72  AVFilterContext *ctx = inlink->dst;
73  int i, ret = 0;
74 
75  for (i = 0; i < ctx->nb_outputs; i++) {
76  AVFrame *buf_out = av_frame_clone(frame);
77  if (!buf_out) {
78  ret = AVERROR(ENOMEM);
79  break;
80  }
81 
82  ret = ff_filter_frame(ctx->outputs[i], buf_out);
83  if (ret < 0)
84  break;
85  }
86  av_frame_free(&frame);
87  return ret;
88 }
89 
90 #define OFFSET(x) offsetof(SplitContext, x)
91 #define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM
92 static const AVOption options[] = {
93  { "outputs", "Number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, FLAGS },
94  { NULL },
95 };
96 
97 static const AVClass split_class = {
98  .class_name = "split",
99  .item_name = av_default_item_name,
100  .option = options,
101  .version = LIBAVUTIL_VERSION_INT,
102 };
103 
104 static const AVClass asplit_class = {
105  .class_name = "asplit",
106  .item_name = av_default_item_name,
107  .option = options,
108  .version = LIBAVUTIL_VERSION_INT,
109 };
110 
112  {
113  .name = "default",
114  .type = AVMEDIA_TYPE_VIDEO,
115  .get_video_buffer = ff_null_get_video_buffer,
116  .filter_frame = filter_frame,
117  },
118  { NULL }
119 };
120 
122  .name = "split",
123  .description = NULL_IF_CONFIG_SMALL("Pass on the input to N video outputs."),
124 
125  .priv_size = sizeof(SplitContext),
126  .priv_class = &split_class,
127 
128  .init = split_init,
129  .uninit = split_uninit,
130 
132  .outputs = NULL,
133 
135 };
136 
138  {
139  .name = "default",
140  .type = AVMEDIA_TYPE_AUDIO,
141  .get_audio_buffer = ff_null_get_audio_buffer,
142  .filter_frame = filter_frame,
143  },
144  { NULL }
145 };
146 
148  .name = "asplit",
149  .description = NULL_IF_CONFIG_SMALL("Pass on the audio input to N audio outputs."),
150 
151  .priv_size = sizeof(SplitContext),
152  .priv_class = &asplit_class,
153 
154  .init = split_init,
155  .uninit = split_uninit,
156 
158  .outputs = NULL,
159 
161 };
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
static const AVClass asplit_class
Definition: split.c:104
AVOption.
Definition: opt.h:234
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:232
Main libavfilter public API header.
memory handling functions
static av_cold void uninit(AVFilterContext *ctx)
Definition: af_amix.c:514
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: split.c:70
AVFrame * ff_null_get_video_buffer(AVFilterLink *link, int w, int h)
Definition: video.c:30
static av_cold void split_uninit(AVFilterContext *ctx)
Definition: split.c:62
Macro definitions for various function/variable attributes.
static av_cold int split_init(AVFilterContext *ctx)
Definition: split.c:43
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
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:733
AVFilterPad * output_pads
array of output pads
Definition: avfilter.h:577
#define av_cold
Definition: attributes.h:66
static const AVClass split_class
Definition: split.c:97
AVOptions.
const char * name
static int flags
Definition: log.c:44
#define AVFILTER_FLAG_DYNAMIC_OUTPUTS
The number of the filter outputs is not determined just by AVFilter.outputs.
Definition: avfilter.h:410
AVFilter ff_vf_split
Definition: split.c:121
#define FLAGS
Definition: split.c:91
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:69
unsigned nb_outputs
number of output pads
Definition: avfilter.h:582
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
#define OFFSET(x)
Definition: split.c:90
void * priv
private data for use by the filter
Definition: avfilter.h:584
static const AVFilterPad avfilter_af_asplit_inputs[]
Definition: split.c:137
common internal API header
static void ff_insert_outpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new output pad for the filter.
Definition: internal.h:183
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
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:270
const AVFilterPad * inputs
List of inputs, terminated by a zeroed element.
Definition: avfilter.h:441
static const AVFilterPad avfilter_vf_split_inputs[]
Definition: split.c:111
NULL
Definition: eval.c:55
AVFilter ff_af_asplit
Definition: split.c:147
char * av_strdup(const char *s)
Duplicate the string s.
Definition: mem.c:213
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
const char * name
Filter name.
Definition: avfilter.h:425
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:578
static const AVOption options[]
Definition: split.c:92
struct AVFilterPad AVFilterPad
Definition: avfilter.h:67
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
int nb_outputs
Definition: split.c:40
An instance of a filter.
Definition: avfilter.h:563
internal API functions
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:566