FFmpeg
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/internal.h"
30 #include "libavutil/mem.h"
31 #include "libavutil/opt.h"
32 
33 #include "avfilter.h"
34 #include "audio.h"
35 #include "filters.h"
36 #include "formats.h"
37 #include "internal.h"
38 #include "video.h"
39 
40 typedef struct SplitContext {
41  const AVClass *class;
43 } SplitContext;
44 
46 {
47  SplitContext *s = ctx->priv;
48  int i, ret;
49 
50  for (i = 0; i < s->nb_outputs; i++) {
51  char name[32];
52  AVFilterPad pad = { 0 };
53 
54  snprintf(name, sizeof(name), "output%d", i);
55  pad.type = ctx->filter->inputs[0].type;
56  pad.name = av_strdup(name);
57  if (!pad.name)
58  return AVERROR(ENOMEM);
59 
60  if ((ret = ff_insert_outpad(ctx, i, &pad)) < 0) {
61  av_freep(&pad.name);
62  return ret;
63  }
64  }
65 
66  return 0;
67 }
68 
70 {
71  int i;
72 
73  for (i = 0; i < ctx->nb_outputs; i++)
74  av_freep(&ctx->output_pads[i].name);
75 }
76 
78 {
79  AVFilterContext *ctx = inlink->dst;
80  int i, ret = AVERROR_EOF;
81 
82  for (i = 0; i < ctx->nb_outputs; i++) {
83  AVFrame *buf_out;
84 
85  if (ff_outlink_get_status(ctx->outputs[i]))
86  continue;
87  buf_out = av_frame_clone(frame);
88  if (!buf_out) {
89  ret = AVERROR(ENOMEM);
90  break;
91  }
92 
93  ret = ff_filter_frame(ctx->outputs[i], buf_out);
94  if (ret < 0)
95  break;
96  }
97  av_frame_free(&frame);
98  return ret;
99 }
100 
101 #define OFFSET(x) offsetof(SplitContext, x)
102 #define FLAGS (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM)
103 static const AVOption options[] = {
104  { "outputs", "set number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, FLAGS },
105  { NULL }
106 };
107 
108 #define split_options options
110 
111 #define asplit_options options
112 AVFILTER_DEFINE_CLASS(asplit);
113 
115  {
116  .name = "default",
117  .type = AVMEDIA_TYPE_VIDEO,
118  .filter_frame = filter_frame,
119  },
120  { NULL }
121 };
122 
124  .name = "split",
125  .description = NULL_IF_CONFIG_SMALL("Pass on the input to N video outputs."),
126  .priv_size = sizeof(SplitContext),
127  .priv_class = &split_class,
128  .init = split_init,
129  .uninit = split_uninit,
130  .inputs = avfilter_vf_split_inputs,
131  .outputs = NULL,
133 };
134 
136  {
137  .name = "default",
138  .type = AVMEDIA_TYPE_AUDIO,
139  .filter_frame = filter_frame,
140  },
141  { NULL }
142 };
143 
145  .name = "asplit",
146  .description = NULL_IF_CONFIG_SMALL("Pass on the audio input to N audio outputs."),
147  .priv_size = sizeof(SplitContext),
148  .priv_class = &asplit_class,
149  .init = split_init,
150  .uninit = split_uninit,
151  .inputs = avfilter_af_asplit_inputs,
152  .outputs = NULL,
154 };
#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.
Memory handling functions.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: split.c:77
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:65
static av_cold void split_uninit(AVFilterContext *ctx)
Definition: split.c:69
Macro definitions for various function/variable attributes.
static av_cold int split_init(AVFilterContext *ctx)
Definition: split.c:45
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
AVFilterPad * output_pads
array of output pads
Definition: avfilter.h:349
#define av_cold
Definition: attributes.h:82
static av_cold int uninit(AVCodecContext *avctx)
Definition: crystalhd.c:279
AVOptions.
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVFILTER_FLAG_DYNAMIC_OUTPUTS
The number of the filter outputs is not determined just by AVFilter.outputs.
Definition: avfilter.h:111
AVFilter ff_vf_split
Definition: split.c:123
A filter pad used for either input or output.
Definition: internal.h:54
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define FLAGS
Definition: split.c:102
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
unsigned nb_outputs
number of output pads
Definition: avfilter.h:351
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
#define OFFSET(x)
Definition: split.c:101
void * priv
private data for use by the filter
Definition: avfilter.h:353
static const AVFilterPad avfilter_af_asplit_inputs[]
Definition: split.c:135
static char * split(char *message, char delim)
Definition: af_channelmap.c:81
common internal API header
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 * 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
const AVFilterPad * inputs
List of inputs, terminated by a zeroed element.
Definition: avfilter.h:164
static const AVFilterPad avfilter_vf_split_inputs[]
Definition: split.c:114
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
AVFilter ff_af_asplit
Definition: split.c:144
AVFILTER_DEFINE_CLASS(split)
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
int ff_outlink_get_status(AVFilterLink *link)
Get the status on an output link.
Definition: avfilter.c:1630
const char * name
Filter name.
Definition: avfilter.h:148
#define snprintf
Definition: snprintf.h:34
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
#define flags(name, subs,...)
Definition: cbs_av1.c:561
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
static const AVOption options[]
Definition: split.c:103
int nb_outputs
Definition: split.c:42
An instance of a filter.
Definition: avfilter.h:338
#define av_freep(p)
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
static int ff_insert_outpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new output pad for the filter.
Definition: internal.h:285
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:341
const char * name
Definition: opengl_enc.c:102