FFmpeg
split.c
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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_append_outpad_free_name(ctx, &pad)) < 0)
60  return ret;
61  }
62 
63  return 0;
64 }
65 
67 {
68  AVFilterContext *ctx = inlink->dst;
69  int i, ret = AVERROR_EOF;
70 
71  for (i = 0; i < ctx->nb_outputs; i++) {
72  AVFrame *buf_out;
73 
74  if (ff_outlink_get_status(ctx->outputs[i]))
75  continue;
76  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  }
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 | AV_OPT_FLAG_FILTERING_PARAM)
92 static const AVOption options[] = {
93  { "outputs", "set number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, FLAGS },
94  { NULL }
95 };
96 
98 
100  {
101  .name = "default",
102  .type = AVMEDIA_TYPE_VIDEO,
103  .filter_frame = filter_frame,
104  },
105 };
106 
108  .name = "split",
109  .description = NULL_IF_CONFIG_SMALL("Pass on the input to N video outputs."),
110  .priv_size = sizeof(SplitContext),
111  .priv_class = &split_class,
112  .init = split_init,
114  .outputs = NULL,
116 };
117 
119  {
120  .name = "default",
121  .type = AVMEDIA_TYPE_AUDIO,
122  .filter_frame = filter_frame,
123  },
124 };
125 
127  .name = "asplit",
128  .description = NULL_IF_CONFIG_SMALL("Pass on the audio input to N audio outputs."),
129  .priv_class = &split_class,
130  .priv_size = sizeof(SplitContext),
131  .init = split_init,
133  .outputs = NULL,
135 };
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: split.c:66
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
AVERROR
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
opt.h
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1019
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
inlink
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
Definition: filter_design.txt:212
av_asprintf
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:113
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:112
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
OFFSET
#define OFFSET(x)
Definition: split.c:90
AVOption
AVOption.
Definition: opt.h:247
options
static const AVOption options[]
Definition: split.c:92
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:153
AVFILTER_DEFINE_CLASS_EXT
AVFILTER_DEFINE_CLASS_EXT(split, "(a)split", options)
SplitContext::nb_outputs
int nb_outputs
Definition: split.c:43
video.h
formats.h
split_init
static av_cold int split_init(AVFilterContext *ctx)
Definition: split.c:46
FLAGS
#define FLAGS
Definition: split.c:91
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:50
ff_vf_split
const AVFilter ff_vf_split
Definition: split.c:107
av_cold
#define av_cold
Definition: attributes.h:90
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
filters.h
ctx
AVFormatContext * ctx
Definition: movenc.c:48
av_frame_clone
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:424
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:152
SplitContext
Definition: split.c:41
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
ff_af_asplit
const AVFilter ff_af_asplit
Definition: split.c:126
AVFILTER_FLAG_DYNAMIC_OUTPUTS
#define AVFILTER_FLAG_DYNAMIC_OUTPUTS
The number of the filter outputs is not determined just by AVFilter.outputs.
Definition: avfilter.h:116
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
split
static char * split(char *message, char delim)
Definition: af_channelmap.c:81
attributes.h
internal.h
i
int i
Definition: input.c:406
internal.h
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:56
AVFilter
Filter definition.
Definition: avfilter.h:149
ret
ret
Definition: filter_design.txt:187
AVFilterPad::type
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:61
frame
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
Definition: filter_design.txt:264
avfilter_af_asplit_inputs
static const AVFilterPad avfilter_af_asplit_inputs[]
Definition: split.c:118
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:224
avfilter.h
ff_outlink_get_status
int ff_outlink_get_status(AVFilterLink *link)
Get the status on an output link.
Definition: avfilter.c:1558
AVFilterContext
An instance of a filter.
Definition: avfilter.h:346
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
audio.h
ff_append_outpad_free_name
int ff_append_outpad_free_name(AVFilterContext *f, AVFilterPad *p)
Definition: avfilter.c:156
avstring.h
avfilter_vf_split_inputs
static const AVFilterPad avfilter_vf_split_inputs[]
Definition: split.c:99