mp3decoder.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 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 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (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.  
 *  
 * 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 "hxtypes.h"
#include "hxcom.h"
#include "hxacodec.h"
#include "mpadecobj.h"
#include "mp3decoder.h"

CMP3AudioDecoder::CMP3AudioDecoder()
{
    m_lRefCount       = 0;
    m_pMpaDecObj      = NULL;
    m_bInitialized    = FALSE;
    m_ulMaxSamplesOut = DEFAULT_MP3_MAXSAMPLESOUT;
    m_ulNumChannels   = DEFAULT_MP3_NUMCHANNELS;
    m_ulSampleRate    = DEFAULT_MP3_SAMPLERATE;
    m_ulDelay         = DEFAULT_MP3_DELAY;
    m_bUseSize        = FALSE;
}

CMP3AudioDecoder::~CMP3AudioDecoder()
{
    HX_DELETE(m_pMpaDecObj);
}

STDMETHODIMP CMP3AudioDecoder::QueryInterface(REFIID riid, void** ppvObj)
{
    HX_RESULT retVal = HXR_NOINTERFACE;

    if (ppvObj)
    {
        // Set default
        *ppvObj = NULL;
        // Switch based on IID
        if (IsEqualIID(riid, IID_IUnknown))
        {
            AddRef();
            *ppvObj = this;
            retVal  = HXR_OK;
        }
        else if (IsEqualIID(riid, IID_IHXAudioDecoder))
        {
            AddRef();
            *ppvObj = (IHXAudioDecoder*) this;
            retVal  = HXR_OK;
        }
    }

    return retVal;
}

STDMETHODIMP_(ULONG32) CMP3AudioDecoder::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}

STDMETHODIMP_(ULONG32) CMP3AudioDecoder::Release()
{
    if (InterlockedDecrement(&m_lRefCount) > 0)
    {
        return m_lRefCount;
    }

    delete this;
    return 0;
}

STDMETHODIMP CMP3AudioDecoder::OpenDecoder(UINT32 cfgType, const void* config, UINT32 nBytes)
{
    HX_RESULT retVal = HXR_FAIL;

    HX_DELETE(m_pMpaDecObj);
    m_pMpaDecObj = new CMpaDecObj();
    if (m_pMpaDecObj)
    {
        // See if we have config data
        if (config && nBytes)
        {
            if (nBytes >= 4)
            {
                // Get the version
                BYTE* pBuf = (BYTE*) config;
                UINT32 ulVersion = (pBuf[0] << 24) | (pBuf[1] << 16) | (pBuf[2] << 8) | pBuf[3];
                // Can we support this version?
                if (ulVersion <= MAX_BITSTREAM_VERSION)
                {
                    // Parse version 0
                    if (ulVersion == 0 && nBytes >= 16)
                    {
                        // Parse the values
                        UINT32 ulNumChannels = (pBuf[4]  << 24) | (pBuf[5]  << 16) | (pBuf[6]  << 8) | pBuf[7];
                        UINT32 ulSampleRate  = (pBuf[8]  << 24) | (pBuf[9]  << 16) | (pBuf[10] << 8) | pBuf[11];
                        UINT32 ulDelay       = (pBuf[12] << 24) | (pBuf[13] << 16) | (pBuf[14] << 8) | pBuf[15];
			UINT32 ulUseSize      = (pBuf[16] << 24) | (pBuf[17] << 16) | (pBuf[18] << 8) | pBuf[19];

                        // Assign the number of channels if non-NULL
                        if (ulNumChannels) m_ulNumChannels = ulNumChannels;
                        // Assign the sample rate if non-NULL
                        if (ulSampleRate)  m_ulSampleRate  = ulSampleRate;
                        // Assign the delay
                        m_ulDelay = ulDelay;
			m_bUseSize = ulUseSize;
                    }
                }
            }
        }
        // Clear the return value
        retVal = HXR_OK;
    }

    return retVal;
}

STDMETHODIMP CMP3AudioDecoder::Reset()
{
    HX_RESULT retVal = HXR_OK;

    return retVal;
}

STDMETHODIMP CMP3AudioDecoder::Conceal(UINT32 nSamples)
{
    return HXR_OK;
}

STDMETHODIMP CMP3AudioDecoder::Decode(const UCHAR* data, UINT32 nBytes,
                                      UINT32 &nBytesConsumed, INT16 *samplesOut, 
                                      UINT32& nSamplesOut, BOOL eof)
{
    HX_RESULT retVal = HXR_FAIL;

    // Set defaults
    nBytesConsumed = 0;
    // Do we have a decoder
    if (m_pMpaDecObj)
    {
        if (!m_bInitialized)
        {
            INT32 lRet = m_pMpaDecObj->Init_n((unsigned char*) data, nBytes, 
					      m_bUseSize);
            if (lRet)
            {
                int lNumChannels   = 0;
                int lBitsPerSample = 0;
                m_pMpaDecObj->GetPCMInfo_v(m_ulSampleRate, lNumChannels, lBitsPerSample);
                m_ulNumChannels   = (UINT32) lNumChannels;
                UINT32 ulMaxSamplesPerChannel = (UINT32) m_pMpaDecObj->GetSamplesPerFrame_n();
                m_ulMaxSamplesOut             = ulMaxSamplesPerChannel * m_ulNumChannels;
                m_bInitialized                = TRUE;
            }
        }
        if (m_bInitialized)
        {
            UINT32 ulSizeIn  = nBytes;
            UINT32 ulSizeOut = nSamplesOut << 1; // want bytes not samples
            m_pMpaDecObj->DecodeFrame_v((unsigned char*) data,
                                        &ulSizeIn,
                                        (unsigned char*) samplesOut,
                                        &ulSizeOut);
            nBytesConsumed = (ulSizeIn <= nBytes) ? ulSizeIn : nBytes;
            nSamplesOut    = ulSizeOut >> 1; // want samples not bytes
            retVal         = (nSamplesOut) ? HXR_OK : HXR_NO_DATA;
        }
    }

    return retVal;
}

STDMETHODIMP CMP3AudioDecoder::GetMaxSamplesOut(UINT32& nSamples) CONSTMETHOD
{
    nSamples = m_ulMaxSamplesOut;
    return HXR_OK;
}

STDMETHODIMP CMP3AudioDecoder::GetNChannels(UINT32& nChannels) CONSTMETHOD
{
    nChannels = m_ulNumChannels;
    return HXR_OK;
}

STDMETHODIMP CMP3AudioDecoder::GetSampleRate(UINT32& sampleRate) CONSTMETHOD
{
    sampleRate = m_ulSampleRate;
    return HXR_OK;
}

STDMETHODIMP CMP3AudioDecoder::GetDelay(UINT32& nSamples) CONSTMETHOD
{
    nSamples = m_ulDelay;
    return HXR_OK;
}