1 /*****************************************************************************
2 * buffer.c : DirectMedia Object decoder module for vlc
3 *****************************************************************************
4 * Copyright (C) 2002, 2003 VideoLAN
7 * Author: Gildas Bazin <gbazin@videolan.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
32 #include <vlc/decoder.h>
39 static long STDCALL QueryInterface( IUnknown *This,
40 const GUID *riid, void **ppv )
42 CMediaBuffer *p_mb = (CMediaBuffer *)This;
43 if( !memcmp( riid, &IID_IUnknown, sizeof(GUID) ) ||
44 !memcmp( riid, &IID_IMediaBuffer, sizeof(GUID) ) )
57 static long STDCALL AddRef( IUnknown *This )
59 CMediaBuffer *p_mb = (CMediaBuffer *)This;
63 static long STDCALL Release( IUnknown *This )
65 CMediaBuffer *p_mb = (CMediaBuffer *)This;
68 if( p_mb->i_ref == 0 )
70 if( p_mb->b_own ) block_Release( p_mb->p_block );
78 static long STDCALL SetLength( IMediaBuffer *This, uint32_t cbLength )
80 CMediaBuffer *p_mb = (CMediaBuffer *)This;
81 if( cbLength > p_mb->i_max_size ) return E_INVALIDARG;
82 p_mb->p_block->i_buffer = cbLength;
86 static long STDCALL GetMaxLength( IMediaBuffer *This, uint32_t *pcbMaxLength )
88 CMediaBuffer *p_mb = (CMediaBuffer *)This;
89 if( !pcbMaxLength ) return E_POINTER;
90 *pcbMaxLength = p_mb->i_max_size;
94 static long STDCALL GetBufferAndLength( IMediaBuffer *This,
95 char **ppBuffer, uint32_t *pcbLength )
97 CMediaBuffer *p_mb = (CMediaBuffer *)This;
99 if( !ppBuffer && !pcbLength ) return E_POINTER;
100 if( ppBuffer ) *ppBuffer = p_mb->p_block->p_buffer;
101 if( pcbLength ) *pcbLength = p_mb->p_block->i_buffer;
105 CMediaBuffer *CMediaBufferCreate( block_t *p_block, int i_max_size,
108 CMediaBuffer *p_mb = (CMediaBuffer *)malloc( sizeof(CMediaBuffer) );
109 if( !p_mb ) return NULL;
111 p_mb->vt = (IMediaBuffer_vt *)malloc( sizeof(IMediaBuffer_vt) );
119 p_mb->p_block = p_block;
120 p_mb->i_max_size = i_max_size;
123 p_mb->vt->QueryInterface = QueryInterface;
124 p_mb->vt->AddRef = AddRef;
125 p_mb->vt->Release = Release;
127 p_mb->vt->SetLength = SetLength;
128 p_mb->vt->GetMaxLength = GetMaxLength;
129 p_mb->vt->GetBufferAndLength = GetBufferAndLength;