ffmpeg/libavdevice/dshow_enumpins.c

   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 "dshow_capture.h"
  23
  24 DECLARE_QUERYINTERFACE(libAVEnumPins,
  25     { {&IID_IUnknown,0}, {&IID_IEnumPins,0} })
  26 DECLARE_ADDREF(libAVEnumPins)
  27 DECLARE_RELEASE(libAVEnumPins)
  28
  29 long WINAPI
  30 libAVEnumPins_Next(libAVEnumPins *this, unsigned long n, IPin **pins,
  31                    unsigned long *fetched)
  32 {
  33     int count = 0;
  34     dshowdebug("libAVEnumPins_Next(%p)\n", this);
  35     if (!pins)
  36         return E_POINTER;
  37     if (!this->pos && n == 1) {
  38         libAVPin_AddRef(this->pin);
  39         *pins = (IPin *) this->pin;
  40         count = 1;
  41         this->pos = 1;
  42     }
  43     if (fetched)
  44         *fetched = count;
  45     if (!count)
  46         return S_FALSE;
  47     return S_OK;
  48 }
  49 long WINAPI
  50 libAVEnumPins_Skip(libAVEnumPins *this, unsigned long n)
  51 {
  52     dshowdebug("libAVEnumPins_Skip(%p)\n", this);
  53     if (n) /* Any skip will always fall outside of the only valid pin. */
  54         return S_FALSE;
  55     return S_OK;
  56 }
  57 long WINAPI
  58 libAVEnumPins_Reset(libAVEnumPins *this)
  59 {
  60     dshowdebug("libAVEnumPins_Reset(%p)\n", this);
  61     this->pos = 0;
  62     return S_OK;
  63 }
  64 long WINAPI
  65 libAVEnumPins_Clone(libAVEnumPins *this, libAVEnumPins **pins)
  66 {
  67     libAVEnumPins *new;
  68     dshowdebug("libAVEnumPins_Clone(%p)\n", this);
  69     if (!pins)
  70         return E_POINTER;
  71     new = libAVEnumPins_Create(this->pin, this->filter);
  72     if (!new)
  73         return E_OUTOFMEMORY;
  74     new->pos = this->pos;
  75     *pins = new;
  76     return S_OK;
  77 }
  78
  79 static int
  80 libAVEnumPins_Setup(libAVEnumPins *this, libAVPin *pin, libAVFilter *filter)
  81 {
  82     IEnumPinsVtbl *vtbl = this->vtbl;
  83     SETVTBL(vtbl, libAVEnumPins, QueryInterface);
  84     SETVTBL(vtbl, libAVEnumPins, AddRef);
  85     SETVTBL(vtbl, libAVEnumPins, Release);
  86     SETVTBL(vtbl, libAVEnumPins, Next);
  87     SETVTBL(vtbl, libAVEnumPins, Skip);
  88     SETVTBL(vtbl, libAVEnumPins, Reset);
  89     SETVTBL(vtbl, libAVEnumPins, Clone);
  90
  91     this->pin = pin;
  92     this->filter = filter;
  93     libAVFilter_AddRef(this->filter);
  94
  95     return 1;
  96 }
  97 static int
  98 libAVEnumPins_Cleanup(libAVEnumPins *this)
  99 {
 100     libAVFilter_Release(this->filter);
 101     return 1;
 102 }
 103 DECLARE_CREATE(libAVEnumPins, libAVEnumPins_Setup(this, pin, filter),
 104                libAVPin *pin, libAVFilter *filter)
 105 DECLARE_DESTROY(libAVEnumPins, libAVEnumPins_Cleanup)