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/opt.h"
32 
33 #include "avfilter.h"
34 #include "audio.h"
35 #include "filters.h"
36 #include "internal.h"
37 #include "video.h"
38 
39 typedef struct SplitContext {
40  const AVClass *class;
42 } SplitContext;
43 
45 {
46  SplitContext *s = ctx->priv;
47  int i, ret;
48 
49  for (i = 0; i < s->nb_outputs; i++) {
50  AVFilterPad pad = { 0 };
51 
52  pad.type = ctx->filter->inputs[0].type;
53  pad.name = av_asprintf("output%d", i);
54  if (!pad.name)
55  return AVERROR(ENOMEM);
56 
57  if ((ret = ff_append_outpad_free_name(ctx, &pad)) < 0)
58  return ret;
59  }
60 
61  return 0;
62 }
63 
65 {
66  AVFilterLink *inlink = ctx->inputs[0];
67  AVFrame *in;
68  int status, ret, nb_eofs = 0;
69  int64_t pts;
70 
71  for (int i = 0; i < ctx->nb_outputs; i++)
72  nb_eofs += ff_outlink_get_status(ctx->outputs[i]) == AVERROR_EOF;
73 
74  if (nb_eofs == ctx->nb_outputs) {
76  return 0;
77  }
78 
80  if (ret < 0)
81  return ret;
82  if (ret > 0) {
83  for (int i = 0; i < ctx->nb_outputs; i++) {
84  AVFrame *buf_out;
85 
86  if (ff_outlink_get_status(ctx->outputs[i]))
87  continue;
88  buf_out = av_frame_clone(in);
89  if (!buf_out) {
90  ret = AVERROR(ENOMEM);
91  break;
92  }
93 
94  ret = ff_filter_frame(ctx->outputs[i], buf_out);
95  if (ret < 0)
96  break;
97  }
98 
99  av_frame_free(&in);
100  if (ret < 0)
101  return ret;
102  }
103 
105  for (int i = 0; i < ctx->nb_outputs; i++) {
106  if (ff_outlink_get_status(ctx->outputs[i]))
107  continue;
108  ff_outlink_set_status(ctx->outputs[i], status, pts);
109  }
110  return 0;
111  }
112 
113  for (int i = 0; i < ctx->nb_outputs; i++) {
114  if (ff_outlink_get_status(ctx->outputs[i]))
115  continue;
116 
117  if (ff_outlink_frame_wanted(ctx->outputs[i])) {
119  return 0;
120  }
121  }
122 
123  return FFERROR_NOT_READY;
124 }
125 
126 #define OFFSET(x) offsetof(SplitContext, x)
127 #define FLAGS (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM)
128 static const AVOption options[] = {
129  { "outputs", "set number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, FLAGS },
130  { NULL }
131 };
132 
134 
136  .name = "split",
137  .description = NULL_IF_CONFIG_SMALL("Pass on the input to N video outputs."),
138  .priv_size = sizeof(SplitContext),
139  .priv_class = &split_class,
140  .init = split_init,
141  .activate = activate,
143  .outputs = NULL,
145 };
146 
148  .name = "asplit",
149  .description = NULL_IF_CONFIG_SMALL("Pass on the audio input to N audio outputs."),
150  .priv_class = &split_class,
151  .priv_size = sizeof(SplitContext),
152  .init = split_init,
153  .activate = activate,
155  .outputs = NULL,
157 };
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:1015
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
FFERROR_NOT_READY
return FFERROR_NOT_READY
Definition: filter_design.txt:204
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:115
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:160
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
OFFSET
#define OFFSET(x)
Definition: split.c:126
AVOption
AVOption.
Definition: opt.h:357
options
static const AVOption options[]
Definition: split.c:128
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
AVFILTER_DEFINE_CLASS_EXT
AVFILTER_DEFINE_CLASS_EXT(split, "(a)split", options)
SplitContext::nb_outputs
int nb_outputs
Definition: split.c:41
video.h
ff_inlink_consume_frame
int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe)
Take a frame from the link's FIFO and update the link's stats.
Definition: avfilter.c:1442
split_init
static av_cold int split_init(AVFilterContext *ctx)
Definition: split.c:44
pts
static int64_t pts
Definition: transcode_aac.c:644
FLAGS
#define FLAGS
Definition: split.c:127
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:33
ff_vf_split
const AVFilter ff_vf_split
Definition: split.c:135
av_cold
#define av_cold
Definition: attributes.h:90
ff_video_default_filterpad
const AVFilterPad ff_video_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_VIDEO.
Definition: video.c:37
ff_outlink_set_status
static void ff_outlink_set_status(AVFilterLink *link, int status, int64_t pts)
Set the status field of a link from the source filter.
Definition: filters.h:189
ff_inlink_request_frame
void ff_inlink_request_frame(AVFilterLink *link)
Mark that a frame is wanted on the link.
Definition: avfilter.c:1568
s
#define s(width, name)
Definition: cbs_vp9.c:198
filters.h
ctx
AVFormatContext * ctx
Definition: movenc.c:49
av_frame_clone
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:593
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:182
SplitContext
Definition: split.c:39
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:147
ff_audio_default_filterpad
const AVFilterPad ff_audio_default_filterpad[1]
An AVFilterPad array whose only entry has name "default" and is of type AVMEDIA_TYPE_AUDIO.
Definition: audio.c:33
ff_inlink_acknowledge_status
int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts)
Test and acknowledge the change of status on the link.
Definition: avfilter.c:1389
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:112
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
ff_inlink_set_status
void ff_inlink_set_status(AVFilterLink *link, int status)
Set the status on an input link.
Definition: avfilter.c:1577
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:94
split
static char * split(char *message, char delim)
Definition: af_channelmap.c:81
attributes.h
internal.h
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
internal.h
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:39
AVFilter
Filter definition.
Definition: avfilter.h:166
ret
ret
Definition: filter_design.txt:187
AVFilterPad::type
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:44
status
ov_status_e status
Definition: dnn_backend_openvino.c:101
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:245
avfilter.h
AVFILTER_FLAG_METADATA_ONLY
#define AVFILTER_FLAG_METADATA_ONLY
The filter is a "metadata" filter - it does not modify the frame data in any way.
Definition: avfilter.h:133
ff_outlink_get_status
int ff_outlink_get_status(AVFilterLink *link)
Get the status on an output link.
Definition: avfilter.c:1593
AVFilterContext
An instance of a filter.
Definition: avfilter.h:407
audio.h
ff_append_outpad_free_name
int ff_append_outpad_free_name(AVFilterContext *f, AVFilterPad *p)
Definition: avfilter.c:143
ff_outlink_frame_wanted
the definition of that something depends on the semantic of the filter The callback must examine the status of the filter s links and proceed accordingly The status of output links is stored in the status_in and status_out fields and tested by the ff_outlink_frame_wanted() function. If this function returns true
avstring.h
activate
static int activate(AVFilterContext *ctx)
Definition: split.c:64