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# AsyncReader.h

    00001 /*
    00002  *      Copyright (C) 2003-2005 Gabest
    00003  *      http://www.gabest.org
    00004  *
    00005  *  This Program is free software; you can redistribute it and/or modify
    00006  *  it under the terms of the GNU General Public License as published by
    00007  *  the Free Software Foundation; either version 2, or (at your option)
    00008  *  any later version.
    00009  *
    00010  *  This Program is distributed in the hope that it will be useful,
    00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    00013  *  GNU General Public License for more details.
    00014  *
    00015  *  You should have received a copy of the GNU General Public License
    00016  *  along with GNU Make; see the file COPYING.  If not, write to
    00017  *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
    00018  *  http://www.gnu.org/copyleft/gpl.html
    00019  *
    00020  */
    00021
    00022 #pragma once
    00023
    00024 [uuid("6DDB4EE7-45A0-4459-A508-BD77B32C91B2")]
    00025 interface ISyncReader : public IUnknown
    00026 {
    00027         STDMETHOD_(void, SetBreakEvent) (HANDLE hBreakEvent) = 0;
    00028         STDMETHOD_(bool, HasErrors) () = 0;
    00029         STDMETHOD_(void, ClearErrors) () = 0;
    00030 };
    00031
    00032 [uuid("7D55F67A-826E-40B9-8A7D-3DF0CBBD272D")]
    00033 interface IFileHandle : public IUnknown
    00034 {
    00035         STDMETHOD_(HANDLE, GetFileHandle)() = 0;
    00036 };
    00037
    00038 class CAsyncFileReader : public CUnknown, public CFile, public IAsyncReader, public ISyncReader, public IFileHandle
    00039 {
    00040 protected:
    00041         ULONGLONG m_len;
    00042         HANDLE m_hBreakEvent;
    00043         LONG m_lOsError; // CFileException::m_lOsError
    00044
    00045 public:
    00046         CAsyncFileReader(CString fn, HRESULT& hr);
    00047
    00048         DECLARE_IUNKNOWN;
    00049         STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, void** ppv);
    00050
    00051         // IAsyncReader
    00052
    00053         STDMETHODIMP RequestAllocator(IMemAllocator* pPreferred, ALLOCATOR_PROPERTIES* pProps, IMemAllocator** ppActual) {return E_NOTIMPL;}
    00054     STDMETHODIMP Request(IMediaSample* pSample, DWORD_PTR dwUser) {return E_NOTIMPL;}
    00055     STDMETHODIMP WaitForNext(DWORD dwTimeout, IMediaSample** ppSample, DWORD_PTR* pdwUser) {return E_NOTIMPL;}
    00056         STDMETHODIMP SyncReadAligned(IMediaSample* pSample) {return E_NOTIMPL;}
    00057         STDMETHODIMP SyncRead(LONGLONG llPosition, LONG lLength, BYTE* pBuffer);
    00058         STDMETHODIMP Length(LONGLONG* pTotal, LONGLONG* pAvailable);
    00059         STDMETHODIMP BeginFlush() {return E_NOTIMPL;}
    00060         STDMETHODIMP EndFlush() {return E_NOTIMPL;}
    00061
    00062         // ISyncReader
    00063
    00064         STDMETHODIMP_(void) SetBreakEvent(HANDLE hBreakEvent) {m_hBreakEvent = hBreakEvent;}
    00065         STDMETHODIMP_(bool) HasErrors() {return m_lOsError != 0;}
    00066         STDMETHODIMP_(void) ClearErrors() {m_lOsError = 0;}
    00067
    00068         // IFileHandle
    00069
    00070         STDMETHODIMP_(HANDLE) GetFileHandle();
    00071
    00072 };
    00073
    00074 class CAsyncUrlReader : public CAsyncFileReader, protected CAMThread
    00075 {
    00076         CString m_url, m_fn;
    00077
    00078 protected:
    00079         enum {CMD_EXIT, CMD_INIT};
    00080     DWORD ThreadProc();
    00081
    00082 public:
    00083         CAsyncUrlReader(CString url, HRESULT& hr);
    00084         virtual ~CAsyncUrlReader();
    00085
    00086         // IAsyncReader
    00087
    00088         STDMETHODIMP Length(LONGLONG* pTotal, LONGLONG* pAvailable);
    00089 };