FFmpeg
dshow_enummediatypes.c
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1 /*
2  * DirectShow capture interface
3  * Copyright (c) 2010 Ramiro Polla
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/mem.h"
23 #include "dshow_capture.h"
24 
26  { {&IID_IUnknown,0}, {&IID_IEnumMediaTypes,0} })
27 DECLARE_ADDREF(enummediatypes, DShowEnumMediaTypes)
28 DECLARE_RELEASE(enummediatypes, DShowEnumMediaTypes)
29 
30 long WINAPI ff_dshow_enummediatypes_Next(DShowEnumMediaTypes *this, unsigned long n,
31  AM_MEDIA_TYPE **types, unsigned long *fetched)
32 {
33  int count = 0;
34  dshowdebug("ff_dshow_enummediatypes_Next(%p)\n", this);
35  if (!types)
36  return E_POINTER;
37  if (!this->pos && n == 1) {
38  if (!IsEqualGUID(&this->type.majortype, &GUID_NULL)) {
39  AM_MEDIA_TYPE *type = av_malloc(sizeof(AM_MEDIA_TYPE));
40  if (!type)
41  return E_OUTOFMEMORY;
42  ff_copy_dshow_media_type(type, &this->type);
43  *types = type;
44  count = 1;
45  }
46  this->pos = 1;
47  }
48  if (fetched)
49  *fetched = count;
50  if (!count)
51  return S_FALSE;
52  return S_OK;
53 }
54 long WINAPI ff_dshow_enummediatypes_Skip(DShowEnumMediaTypes *this, unsigned long n)
55 {
56  dshowdebug("ff_dshow_enummediatypes_Skip(%p)\n", this);
57  if (n) /* Any skip will always fall outside of the only valid type. */
58  return S_FALSE;
59  return S_OK;
60 }
62 {
63  dshowdebug("ff_dshow_enummediatypes_Reset(%p)\n", this);
64  this->pos = 0;
65  return S_OK;
66 }
68 {
70  dshowdebug("ff_dshow_enummediatypes_Clone(%p)\n", this);
71  if (!enums)
72  return E_POINTER;
73  new = ff_dshow_enummediatypes_Create(&this->type);
74  if (!new)
75  return E_OUTOFMEMORY;
76  new->pos = this->pos;
77  *enums = new;
78  return S_OK;
79 }
80 
81 static int ff_dshow_enummediatypes_Setup(DShowEnumMediaTypes *this, const AM_MEDIA_TYPE *type)
82 {
83  IEnumMediaTypesVtbl *vtbl = this->vtbl;
84  SETVTBL(vtbl, enummediatypes, QueryInterface);
85  SETVTBL(vtbl, enummediatypes, AddRef);
86  SETVTBL(vtbl, enummediatypes, Release);
87  SETVTBL(vtbl, enummediatypes, Next);
88  SETVTBL(vtbl, enummediatypes, Skip);
89  SETVTBL(vtbl, enummediatypes, Reset);
90  SETVTBL(vtbl, enummediatypes, Clone);
91 
92  if (!type) {
93  this->type.majortype = GUID_NULL;
94  } else {
95  ff_copy_dshow_media_type(&this->type, type);
96  }
97 
98  return 1;
99 }
100 DECLARE_CREATE(enummediatypes, DShowEnumMediaTypes, ff_dshow_enummediatypes_Setup(this, type), const AM_MEDIA_TYPE *type)
DECLARE_CREATE
#define DECLARE_CREATE(prefix, class, setup,...)
Definition: dshow_capture.h:123
nothing
static void nothing(void *foo)
Definition: dshow_capture.h:52
dshow_capture.h
DECLARE_QUERYINTERFACE
DECLARE_QUERYINTERFACE(enummediatypes, DShowEnumMediaTypes, { {&IID_IUnknown, 0}, {&IID_IEnumMediaTypes, 0} })
Definition: dshow_enummediatypes.c:25
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
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
DECLARE_ADDREF
#define DECLARE_ADDREF(prefix, class)
Definition: dshow_capture.h:94
dshowdebug
#define dshowdebug(...)
Definition: dshow_capture.h:50
ff_dshow_enummediatypes_Next
long WINAPI ff_dshow_enummediatypes_Next(DShowEnumMediaTypes *, unsigned long, AM_MEDIA_TYPE **, unsigned long *)
ff_copy_dshow_media_type
long ff_copy_dshow_media_type(AM_MEDIA_TYPE *dst, const AM_MEDIA_TYPE *src)
Definition: dshow_common.c:24
SETVTBL
#define SETVTBL(vtbl, prefix, fn)
Definition: dshow_capture.h:146
DShowEnumMediaTypes
Definition: dshow_capture.h:229
ff_dshow_enummediatypes_Create
DShowEnumMediaTypes * ff_dshow_enummediatypes_Create(const AM_MEDIA_TYPE *type)
ff_dshow_enummediatypes_Skip
long WINAPI ff_dshow_enummediatypes_Skip(DShowEnumMediaTypes *this, unsigned long n)
Definition: dshow_enummediatypes.c:54
ff_dshow_enummediatypes_Setup
static int ff_dshow_enummediatypes_Setup(DShowEnumMediaTypes *this, const AM_MEDIA_TYPE *type)
Definition: dshow_enummediatypes.c:81
DECLARE_DESTROY
#define DECLARE_DESTROY(prefix, class, func)
Definition: dshow_capture.h:112
DECLARE_RELEASE
#define DECLARE_RELEASE(prefix, class)
Definition: dshow_capture.h:101
ff_dshow_enummediatypes_Clone
long WINAPI ff_dshow_enummediatypes_Clone(DShowEnumMediaTypes *this, DShowEnumMediaTypes **enums)
Definition: dshow_enummediatypes.c:67
pos
unsigned int pos
Definition: spdifenc.c:414
ff_dshow_enummediatypes_Reset
long WINAPI ff_dshow_enummediatypes_Reset(DShowEnumMediaTypes *this)
Definition: dshow_enummediatypes.c:61
mem.h