buffer.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:4k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * buffer.c : DirectMedia Object decoder module for vlc
- *****************************************************************************
- * Copyright (C) 2002, 2003 the VideoLAN team
- * $Id: 321709df219adb552a9ec4c0ce392b698c022a55 $
- *
- * Author: Gildas Bazin <gbazin@videolan.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_codec.h>
- #include <vlc_vout.h>
- #ifndef WIN32
- # define LOADER
- #else
- # include <objbase.h>
- #endif
- #ifdef LOADER
- # include <wine/winerror.h>
- # include <wine/windef.h>
- #endif
- #include <vlc_codecs.h>
- #include "dmo.h"
- static long STDCALL QueryInterface( IUnknown *This,
- const GUID *riid, void **ppv )
- {
- CMediaBuffer *p_mb = (CMediaBuffer *)This;
- if( !memcmp( riid, &IID_IUnknown, sizeof(GUID) ) ||
- !memcmp( riid, &IID_IMediaBuffer, sizeof(GUID) ) )
- {
- p_mb->i_ref++;
- *ppv = (void *)This;
- return NOERROR;
- }
- else
- {
- *ppv = NULL;
- return E_NOINTERFACE;
- }
- }
- static long STDCALL AddRef( IUnknown *This )
- {
- CMediaBuffer *p_mb = (CMediaBuffer *)This;
- return p_mb->i_ref++;
- }
- static long STDCALL Release( IUnknown *This )
- {
- CMediaBuffer *p_mb = (CMediaBuffer *)This;
- p_mb->i_ref--;
- if( p_mb->i_ref == 0 )
- {
- if( p_mb->b_own ) block_Release( p_mb->p_block );
- free( p_mb->vt );
- free( p_mb );
- }
- return 0;
- }
- static long STDCALL SetLength( IMediaBuffer *This, uint32_t cbLength )
- {
- CMediaBuffer *p_mb = (CMediaBuffer *)This;
- if( cbLength > (uint32_t)p_mb->i_max_size ) return E_INVALIDARG;
- p_mb->p_block->i_buffer = cbLength;
- return S_OK;
- }
- static long STDCALL GetMaxLength( IMediaBuffer *This, uint32_t *pcbMaxLength )
- {
- CMediaBuffer *p_mb = (CMediaBuffer *)This;
- if( !pcbMaxLength ) return E_POINTER;
- *pcbMaxLength = p_mb->i_max_size;
- return S_OK;
- }
- static long STDCALL GetBufferAndLength( IMediaBuffer *This,
- char **ppBuffer, uint32_t *pcbLength )
- {
- CMediaBuffer *p_mb = (CMediaBuffer *)This;
- if( !ppBuffer && !pcbLength ) return E_POINTER;
- if( ppBuffer ) *ppBuffer = (char*)p_mb->p_block->p_buffer;
- if( pcbLength ) *pcbLength = p_mb->p_block->i_buffer;
- return S_OK;
- }
- CMediaBuffer *CMediaBufferCreate( block_t *p_block, int i_max_size,
- bool b_own )
- {
- CMediaBuffer *p_mb = (CMediaBuffer *)malloc( sizeof(CMediaBuffer) );
- if( !p_mb ) return NULL;
- p_mb->vt = (IMediaBuffer_vt *)malloc( sizeof(IMediaBuffer_vt) );
- if( !p_mb->vt )
- {
- free( p_mb );
- return NULL;
- }
- p_mb->i_ref = 1;
- p_mb->p_block = p_block;
- p_mb->i_max_size = i_max_size;
- p_mb->b_own = b_own;
- p_mb->vt->QueryInterface = QueryInterface;
- p_mb->vt->AddRef = AddRef;
- p_mb->vt->Release = Release;
- p_mb->vt->SetLength = SetLength;
- p_mb->vt->GetMaxLength = GetMaxLength;
- p_mb->vt->GetBufferAndLength = GetBufferAndLength;
- return p_mb;
- }