FFmpeg
stereo3d.c
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1 /*
2  * Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.com>
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 #include <string.h>
22 
23 #include "avstring.h"
24 #include "common.h"
25 #include "mem.h"
26 #include "stereo3d.h"
27 
28 AVStereo3D *av_stereo3d_alloc(void)
29 {
30  return av_mallocz(sizeof(AVStereo3D));
31 }
32 
33 AVStereo3D *av_stereo3d_create_side_data(AVFrame *frame)
34 {
35  AVFrameSideData *side_data = av_frame_new_side_data(frame,
36  AV_FRAME_DATA_STEREO3D,
37  sizeof(AVStereo3D));
38  if (!side_data)
39  return NULL;
40 
41  memset(side_data->data, 0, sizeof(AVStereo3D));
42 
43  return (AVStereo3D *)side_data->data;
44 }
45 
46 static const char * const stereo3d_type_names[] = {
47  [AV_STEREO3D_2D] = "2D",
48  [AV_STEREO3D_SIDEBYSIDE] = "side by side",
49  [AV_STEREO3D_TOPBOTTOM] = "top and bottom",
50  [AV_STEREO3D_FRAMESEQUENCE] = "frame alternate",
51  [AV_STEREO3D_CHECKERBOARD] = "checkerboard",
52  [AV_STEREO3D_SIDEBYSIDE_QUINCUNX] = "side by side (quincunx subsampling)",
53  [AV_STEREO3D_LINES] = "interleaved lines",
54  [AV_STEREO3D_COLUMNS] = "interleaved columns",
55 };
56 
57 const char *av_stereo3d_type_name(unsigned int type)
58 {
59  if (type >= FF_ARRAY_ELEMS(stereo3d_type_names))
60  return "unknown";
61 
62  return stereo3d_type_names[type];
63 }
64 
65 int av_stereo3d_from_name(const char *name)
66 {
67  int i;
68 
69  for (i = 0; i < FF_ARRAY_ELEMS(stereo3d_type_names); i++) {
70  if (av_strstart(name, stereo3d_type_names[i], NULL))
71  return i;
72  }
73 
74  return -1;
75 }
name
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option name
Definition: writing_filters.txt:88
AV_STEREO3D_SIDEBYSIDE_QUINCUNX
@ AV_STEREO3D_SIDEBYSIDE_QUINCUNX
Views are next to each other, but when upscaling apply a checkerboard pattern.
Definition: stereo3d.h:117
av_frame_new_side_data
AVFrameSideData * av_frame_new_side_data(AVFrame *frame, enum AVFrameSideDataType type, size_t size)
Add a new side data to a frame.
Definition: frame.c:605
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:317
AV_STEREO3D_SIDEBYSIDE
@ AV_STEREO3D_SIDEBYSIDE
Views are next to each other.
Definition: stereo3d.h:67
AV_STEREO3D_2D
@ AV_STEREO3D_2D
Video is not stereoscopic (and metadata has to be there).
Definition: stereo3d.h:55
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
AV_STEREO3D_FRAMESEQUENCE
@ AV_STEREO3D_FRAMESEQUENCE
Views are alternated temporally.
Definition: stereo3d.h:92
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
AV_STEREO3D_LINES
@ AV_STEREO3D_LINES
Views are packed per line, as if interlaced.
Definition: stereo3d.h:129
stereo3d.h
NULL
#define NULL
Definition: coverity.c:32
AV_STEREO3D_CHECKERBOARD
@ AV_STEREO3D_CHECKERBOARD
Views are packed in a checkerboard-like structure per pixel.
Definition: stereo3d.h:104
AVFrameSideData::data
uint8_t * data
Definition: frame.h:225
av_strstart
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
Definition: avstring.c:34
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
AV_STEREO3D_TOPBOTTOM
@ AV_STEREO3D_TOPBOTTOM
Views are on top of each other.
Definition: stereo3d.h:79
common.h
AV_FRAME_DATA_STEREO3D
@ AV_FRAME_DATA_STEREO3D
Stereoscopic 3d metadata.
Definition: frame.h:63
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:263
stereo3d_type_names
static const char *const stereo3d_type_names[]
Definition: stereo3d.c:46
av_stereo3d_alloc
AVStereo3D * av_stereo3d_alloc(void)
Allocate an AVStereo3D structure and set its fields to default values.
Definition: stereo3d.c:28
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
AV_STEREO3D_COLUMNS
@ AV_STEREO3D_COLUMNS
Views are packed per column.
Definition: stereo3d.h:141
mem.h
av_stereo3d_create_side_data
AVStereo3D * av_stereo3d_create_side_data(AVFrame *frame)
Allocate a complete AVFrameSideData and add it to the frame.
Definition: stereo3d.c:33
AVFrameSideData
Structure to hold side data for an AVFrame.
Definition: frame.h:223
av_stereo3d_type_name
const char * av_stereo3d_type_name(unsigned int type)
Provide a human-readable name of a given stereo3d type.
Definition: stereo3d.c:57
AVStereo3D
Stereo 3D type: this structure describes how two videos are packed within a single video surface,...
Definition: stereo3d.h:176
avstring.h
av_stereo3d_from_name
int av_stereo3d_from_name(const char *name)
Get the AVStereo3DType form a human-readable name.
Definition: stereo3d.c:65
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