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  AVFilterLink *inlink = ctx->inputs[0];
69  AVFrame *in;
70  int status, ret;
71  int64_t pts;
72 
73  for (int i = 0; i < ctx->nb_outputs; i++) {
75  }
76 
78  if (ret < 0)
79  return ret;
80  if (ret > 0) {
81  for (int 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(in);
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  }
96 
97  av_frame_free(&in);
98  if (ret < 0)
99  return ret;
100  }
101 
103  for (int i = 0; i < ctx->nb_outputs; i++) {
104  if (ff_outlink_get_status(ctx->outputs[i]))
105  continue;
106  ff_outlink_set_status(ctx->outputs[i], status, pts);
107  }
108  return 0;
109  }
110 
111  for (int i = 0; i < ctx->nb_outputs; i++) {
112  if (ff_outlink_get_status(ctx->outputs[i]))
113  continue;
114 
115  if (ff_outlink_frame_wanted(ctx->outputs[i])) {
117  return 0;
118  }
119  }
120 
121  return FFERROR_NOT_READY;
122 }
123 
124 #define OFFSET(x) offsetof(SplitContext, x)
125 #define FLAGS (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM)
126 static const AVOption options[] = {
127  { "outputs", "set number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, INT_MAX, FLAGS },
128  { NULL }
129 };
130 
132 
134  {
135  .name = "default",
136  .type = AVMEDIA_TYPE_VIDEO,
137  },
138 };
139 
141  .name = "split",
142  .description = NULL_IF_CONFIG_SMALL("Pass on the input to N video outputs."),
143  .priv_size = sizeof(SplitContext),
144  .priv_class = &split_class,
145  .init = split_init,
146  .activate = activate,
148  .outputs = NULL,
150 };
151 
153  {
154  .name = "default",
155  .type = AVMEDIA_TYPE_AUDIO,
156  },
157 };
158 
160  .name = "asplit",
161  .description = NULL_IF_CONFIG_SMALL("Pass on the audio input to N audio outputs."),
162  .priv_class = &split_class,
163  .priv_size = sizeof(SplitContext),
164  .init = split_init,
165  .activate = activate,
167  .outputs = NULL,
169 };
status
they must not be accessed directly The fifo field contains the frames that are queued in the input for processing by the filter The status_in and status_out fields contains the queued status(EOF or error) of the link
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:1009
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:116
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:116
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
OFFSET
#define OFFSET(x)
Definition: split.c:124
AVOption
AVOption.
Definition: opt.h:251
options
static const AVOption options[]
Definition: split.c:126
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:175
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
init
static int init
Definition: av_tx.c:47
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:1404
FF_FILTER_FORWARD_STATUS_BACK_ALL
#define FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, filter)
Forward the status on an output link to all input links.
Definition: filters.h:212
split_init
static av_cold int split_init(AVFilterContext *ctx)
Definition: split.c:46
pts
static int64_t pts
Definition: transcode_aac.c:654
FLAGS
#define FLAGS
Definition: split.c:125
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:49
ff_vf_split
const AVFilter ff_vf_split
Definition: split.c:140
av_cold
#define av_cold
Definition: attributes.h:90
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:1521
s
#define s(width, name)
Definition: cbs_vp9.c:256
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:474
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:190
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:159
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:1358
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:122
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:115
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:269
internal.h
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:55
AVFilter
Filter definition.
Definition: avfilter.h:171
ret
ret
Definition: filter_design.txt:187
AVFilterPad::type
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:60
avfilter_af_asplit_inputs
static const AVFilterPad avfilter_af_asplit_inputs[]
Definition: split.c:152
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
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:143
ff_outlink_get_status
int ff_outlink_get_status(AVFilterLink *link)
Get the status on an output link.
Definition: avfilter.c:1544
AVFilterContext
An instance of a filter.
Definition: avfilter.h:408
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:142
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
avfilter_vf_split_inputs
static const AVFilterPad avfilter_vf_split_inputs[]
Definition: split.c:133
activate
static int activate(AVFilterContext *ctx)
Definition: split.c:66