pxpngdec.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: pxpngdec.cpp,v 1.2.24.1 2004/07/09 01:52:12 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
 * 
 * The contents of this file, and the files included with this file,
 * are subject to the current version of the RealNetworks Public
 * Source License (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
 * http://www.helixcommunity.org/content/rcsl, in which case the RCSL
 * will apply. You may also obtain the license terms directly from
 * RealNetworks.  You may not use this file except in compliance with
 * the RPSL or, if you have a valid RCSL with RealNetworks applicable
 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
 * the rights, obligations and limitations governing use of the
 * contents of the file.
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
 * instead of those above. If you wish to allow use of your version of
 * this file only under the terms of the GPL, and not to allow others
 * to use your version of this file under the terms of either the RPSL
 * or RCSL, indicate your decision by deleting the provisions above
 * and replace them with the notice and other provisions required by
 * the GPL. If you do not delete the provisions above, a recipient may
 * use your version of this file under the terms of any one of the
 * RPSL, the RCSL or the GPL.
 * 
 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
 * portions it created.
 * 
 * This file, and the files included with this file, is distributed
 * and made available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY
 * KIND, EITHER EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS
 * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET
 * ENJOYMENT OR NON-INFRINGEMENT.
 * 
 * Technology Compatibility Kit Test Suite(s) Location:
 *    http://www.helixcommunity.org/content/tck
 * 
 * Contributor(s):
 * 
 * ***** END LICENSE BLOCK ***** */

// include
#include "hxtypes.h"
#include "hxwintyp.h"
#include "hxresult.h"
#include "hxcom.h"
#include "hxcomm.h"
#include "ihxpckts.h"
#include "hxvsurf.h"

// pnmisc
#include "baseobj.h"
#include "netbyte.h"

// pxcomlib

// libpng
#include "png.h"

// pxpnglib
#include "pxpngdec.h"

// pndebug
#include "hxheap.h"
#ifdef _DEBUG
#undef HX_THIS_FILE     
static char HX_THIS_FILE[] = __FILE__;
#endif
#include "errdbg.h"
#include "hxperf.h"

PXPNGDecode::PXPNGDecode()
{
    m_lRefCount = 0;
    Reset();
}

PXPNGDecode::~PXPNGDecode()
{
    Deallocate();
}

void PXPNGDecode::Reset()
{
    m_pPNGStruct          = NULL;
    m_pPNGInfo            = NULL;
    m_pPNGEndInfo         = NULL;
    m_pOutputBuffer       = NULL;
    m_ppImageRow          = NULL;
    m_bSingleBufferIO     = FALSE;
    m_bDupFirstBuffer     = FALSE;
    m_bFirstDecompress    = TRUE;
    m_bDeferFirstBuffer   = FALSE;
    m_pFirstBuffer        = NULL;
    m_ulFirstBufferOffset = 0;
    m_bFinished           = FALSE;
    m_ulLastSeqNum        = 0;
    m_bValid              = TRUE;
}

void PXPNGDecode::Deallocate()
{
    DeallocateErrorHandling(m_pPNGStruct);
    DeallocateIOHandling(m_pPNGStruct);
    if (m_pPNGStruct)
    {
        png_destroy_read_struct(&m_pPNGStruct, &m_pPNGInfo, &m_pPNGEndInfo);
    }
    HX_RELEASE(m_pOutputBuffer);
    HX_VECTOR_DELETE(m_ppImageRow);
    Reset();
}

STDMETHODIMP PXPNGDecode::QueryInterface(REFIID riid, void** ppvObj)
{
    HX_RESULT retVal = HXR_OK;

    if (IsEqualIID(riid, IID_IUnknown))
    {
        AddRef();
        *ppvObj = (IUnknown*) this;
    }
    else
    {
        *ppvObj = NULL;
        retVal  = HXR_NOINTERFACE;
    }

    return retVal;
}

STDMETHODIMP_(UINT32) PXPNGDecode::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}

STDMETHODIMP_(UINT32) PXPNGDecode::Release()
{
    
    if (InterlockedDecrement(&m_lRefCount) > 0)
        return m_lRefCount;

    delete this;

    return 0;
}

BOOL PXPNGDecode::ValidInputData(IHXBuffer* pBuffer)
{
    BOOL bRet = FALSE;

    if (pBuffer)
    {
        if (pBuffer->GetSize() >= 8)
        {
            BYTE* pBuf = pBuffer->GetBuffer();
            if (pBuf)
            {
                UINT32 ulSig0 = (pBuf[0] << 24) |
                                (pBuf[1] << 16) |
                                (pBuf[2] <<  8) |
                                (pBuf[3]);
                UINT32 ulSig1 = (pBuf[4] << 24) |
                                (pBuf[5] << 16) |
                                (pBuf[6] <<  8) |
                                (pBuf[7]);
                if (ulSig0 == kSig0 && ulSig1 == kSig1)
                {
                    bRet = TRUE;
                }
            }
        }
    }

    return bRet;
}

HX_RESULT PXPNGDecode::Init(IUnknown*   pContext,
                            IHXBuffer* pBuffer,
                            BOOL        bDupFirstBuffer)
{
    HX_LOG_BLOCK( "PXPNGDecode::Init" );

    HX_RESULT retVal = HXR_FAIL;

    if (pContext && pBuffer)
    {
        // Clear out and reset everything
        Deallocate();
        // Save member
        m_bDupFirstBuffer  = bDupFirstBuffer;
        // Init the first decompress flag
        m_bFirstDecompress = TRUE;
        // Init the finished flag
        m_bFinished        = FALSE;
        // Create a PXUserError struct
        PXUserError* pUserError = new PXUserError;
        if (pUserError)
        {
            // Init the members of the struct
            pUserError->m_pContext = pContext;
            pUserError->m_pContext->AddRef();
            pUserError->m_pErrorStr = NULL;
            // Create the read struct
            m_pPNGStruct = png_create_read_struct(PNG_LIBPNG_VER_STRING,
                                                  (png_voidp) pUserError,
                                                  HandleError,
                                                  HandleWarning);
            if (m_pPNGStruct)
            {
                // Set the error return jump
                if (setjmp(m_pPNGStruct->jmpbuf))
                {
                    // If we get here, then libpng threw an error and
                    // we longjmp'd back here.
                    return HXR_FAIL;
                }
                // Create the info struct
                m_pPNGInfo = png_create_info_struct(m_pPNGStruct);
                if (m_pPNGInfo)
                {
                    // Create the end info struct
                    m_pPNGEndInfo = png_create_info_struct(m_pPNGStruct);
                    if (m_pPNGEndInfo)
                    {
                        // If we have a complete IEND chunk, then we have
                        // the entire file. Therefore, we'll process this as a
                        // single buffer read. If we dont' have a complete IEND
                        // chunk, then we will attempt to process it as 
                        // a progressive read.
                        if (IsCompleteChunkPresent(pBuffer, kIEND))
                        {
                            // Set the single-buffer-IO flag
                            m_bSingleBufferIO = TRUE;
                            // First we need to create a single-buffer read struct
                            PXUserIOSingle* pUserIO = new PXUserIOSingle;
                            if (pUserIO)
                            {
                                // Set the members of the struct
                                pUserIO->m_pBuffer   = pBuffer;
                                pUserIO->m_ulOffset  = 0;
                                pUserIO->m_pBuffer->AddRef();
                                // Set up the single-buffer callback
                                png_set_read_fn(m_pPNGStruct,
                                                (png_voidp) pUserIO,
                                                (png_rw_ptr) SingleBufferRead);
                                // Now we can call to read all the way up
                                // to (but not including) the actual image data
                                // After this call, then all the accessor methods
                                // (GetWidth(), GetHeight(), etc.) should be valid
                                png_read_info(m_pPNGStruct, m_pPNGInfo);
                                // Clear the return value
                                retVal = HXR_OK;
                            }
                        }
                        else
                        {
                            // Clear the single-buffer-IO flag
                            m_bSingleBufferIO = FALSE;
                            // We require that at least the first kMinIDATBytes
                            // of the IDAT chunk to be present (just the length and the
                            // IDAT chunk type) in the first buffer. (This forces
                            // libpng to make the info callback after the first
                            // call to png_process_data(), which we need if we are
                            // going to be able to provide width/height info to
                            // the app). If we have more than the first kMinIDATBytes
                            // in the first buffer, that's OK - we will only supply
                            // up to the first 8 bytes to the first call to 
                            // png_process_data() and defer the processing of the rest
                            // of the first buffer.
                            UINT32 ulIDATBytes  = 0;
                            UINT32 ulIDATOffset = 0;
                            BOOL   bComplete    = FALSE;
                            BOOL   bIDATPresent = IsChunkPresent(pBuffer,
                                                                 kIDAT,
                                                                 ulIDATOffset,
                                                                 ulIDATBytes,
                                                                 bComplete);
                            if (bIDATPresent && ulIDATBytes >= kMinIDATBytes)
                            {
                                // Create a progressive read struct
                                PXUserIOProgressive* pUserIO = new PXUserIOProgressive;
                                if (pUserIO)
                                {
                                    // Set the member
                                    pUserIO->m_ulAppState  = kAppStateConstructed;
                                    pUserIO->m_ulDataState = kDataStateConstructed;
                                    pUserIO->m_ulNumRows   = 0;
                                    pUserIO->m_ppImageRow  = NULL;
                                    // Set up the progressive read callbacks
                                    png_set_progressive_read_fn(m_pPNGStruct,
                                                                (png_voidp) pUserIO,
                                                                InfoCallback,
                                                                RowCallback,
                                                                EndCallback);
                                    // Now if we have MORE than kMinIDATBytes in the
                                    // first buffer, then that's OK - we will defer
                                    // the processing of those bytes until later.
                                    // However, we must save the first buffer and
                                    // the offset and set a flag saying we need to
                                    // process the first buffer.
                                    UINT32 ulBytesToProcessNow = 0;
                                    if (ulIDATBytes > kMinIDATBytes)
                                    {
                                        // Save these members so we can process the
                                        // rest of the first buffer later
                                        m_bDeferFirstBuffer   = TRUE;
                                        m_ulFirstBufferOffset = ulIDATOffset + kMinIDATBytes;
                                        HX_RELEASE(m_pFirstBuffer);
                                        m_pFirstBuffer = pBuffer;
                                        m_pFirstBuffer->AddRef();
                                        // Compute the number of bytes to process
                                        // right now
                                        ulBytesToProcessNow = m_ulFirstBufferOffset;
                                    }
                                    else
                                    {
                                        // We had exactly kMinIDATBytes in the first buffer,
                                        // so there's no need to defer processing of
                                        // any part of the buffer
                                        m_bDeferFirstBuffer = FALSE;
                                        ulBytesToProcessNow = pBuffer->GetSize();
                                    }
#ifdef XXXMEH_DEBUG_LOG
                                    DEBUG_OUTF("c:\\pxpnglib.log", (s, "Init(): calling png_process_data()\n"));
#endif
                                    // Process the first buffer
                                    png_process_data(m_pPNGStruct,
                                                     m_pPNGInfo,
                                                     (png_bytep)  pBuffer->GetBuffer(),
                                                     (png_size_t) ulBytesToProcessNow);
                                    // Set the app state
                                    pUserIO->m_ulAppState = kAppStateInit;