ijglwrap.cpp

linux下的一款播放器

                                               m_ulChromaKeyTol,
                                               m_ulChromaKeyOpacity);
                }
            }
            if (m_cDecompress.output_scanline >= m_cDecompress.output_height)
            {
                m_ulState = kStateReadingCompleted;
            }
        }
        else if (m_ulState == kStateReadingCompleted)
        {
            /* Finish the decompression */
            bRet = jpeg_finish_decompress(&m_cDecompress);
            if (bRet == TRUE)
            {
                /* We had enough data */
                m_bSuspended = FALSE;
                /* Set the new state */
                m_ulState = kStateFinished;
            }
            else
            {
                /* We suspended */
                m_bSuspended = TRUE;
            }
        }
    }
    while (m_bSuspended == FALSE && m_ulState != kStateFinished);

    return HXR_OK;
}

void /*_cdecl*/ CIJGLibraryWrapper::ErrorExit(j_common_ptr cinfo)
{
    /* Check for input error conditions */
    if (cinfo->err == NULL)
    {
        return;
    }
    if (cinfo->err->output_message == NULL)
    {
        return;
    }

    /* Call our output message function */
    (*cinfo->err->output_message)(cinfo);

    /* Get a pointer to a WrapperErrorMgr */
    WrapperErrorMgr *pMgr = (WrapperErrorMgr *) cinfo->err;

    /* Return control to the setjmp point */
    longjmp(pMgr->m_cSetJmpBuf, 1);
};

void /*_cdecl*/ CIJGLibraryWrapper::OutputMessage(j_common_ptr cinfo)
{
    /* Check for input error conditions */
    if (cinfo->err == NULL)
    {
        return;
    }
    if (cinfo->err->format_message == NULL)
    {
        return;
    }

    /* Get a pointer to a WrapperErrorMgr */
    WrapperErrorMgr *pMgr = (WrapperErrorMgr *) cinfo->err;

    /* Create the message */
    (*cinfo->err->format_message)(cinfo, (char *) pMgr->m_cErrStr.c_str());
}

UINT32 CIJGLibraryWrapper::GetMemorySum()
{
    /* Run through our current buffer list and add up the sizes */
    UINT32 ulSum = 0;
    for (GListIterator itr  = m_cSrcMgr.m_cBufferList.Begin();
                       itr != m_cSrcMgr.m_cBufferList.End(); itr++)
    {
        /* Get the pointer from the iterator */
        IHXBuffer *pBuffer = (IHXBuffer *) *itr;

        /* Add the buffer size */
        ulSum += pBuffer->GetSize();
    }

    return ulSum;
}

void /*_cdecl*/ CIJGLibraryWrapper::InitSource(j_decompress_ptr cinfo)
{
    /* No work to do here */
}

boolean /*_cdecl*/ CIJGLibraryWrapper::FillInputBuffer(j_decompress_ptr cinfo)
{
    /* Check for input error conditions */
    if (cinfo->src == NULL)
    {
        ERREXIT(cinfo, JERR_INPUT_EMPTY);
    }

    /* Get a pointer to a BufferListSrcMgr */
    BufferListSrcMgr *pMgr = (BufferListSrcMgr *) cinfo->src;

    /* Check to see if there are more buffers in the list */
    if (pMgr->m_lCurrentIndex + 1 >= (INT32) pMgr->m_cBufferList.Size())
    {
        /* We don't have any more buffers in our list, so suspend. */
        return FALSE;
    }

    /* We do have more buffers, so increment the index and get the MyBuffer pointer */
    pMgr->m_lCurrentIndex++;
    IHXBuffer *pBuffer = (IHXBuffer *) pMgr->m_cBufferList[pMgr->m_lCurrentIndex];
    if (pBuffer == NULL)
    {
        ERREXIT(cinfo, JERR_INPUT_EMPTY);
    }

    /* Save the current public source manager state variables */
    UINT32 ulOldBytesInBuffer = pMgr->m_cPubSrcMgr.bytes_in_buffer;
    BYTE  *pOldNextInputByte  = (BYTE *) pMgr->m_cPubSrcMgr.next_input_byte;

    // There might be some header bytes at the beginning of each buffer,
    // so we must offset by this amount
    pMgr->m_cPubSrcMgr.bytes_in_buffer = pBuffer->GetSize()   - pMgr->m_ulBufferOffset;
    pMgr->m_cPubSrcMgr.next_input_byte = pBuffer->GetBuffer() + pMgr->m_ulBufferOffset;

    /*
     * If this is the first successful fill we've done, then
     * don't try to remove any buffers from the list.
     */
    if (pMgr->m_bFirstFill == TRUE)
    {
        pMgr->m_bFirstFill = FALSE;
        return TRUE;
    }
    
    /*
     * Determine which buffers we can release. The restart point is
     * defined by the next_input_byte pointer. All buffers which are
     * before the buffer which contains the restart point can be deleted.
     */
    while (pMgr->m_cBufferList.Size() > 0)
    {
        /* Get the buffer at the front of the list */
        IHXBuffer *pListBuffer = (IHXBuffer *) pMgr->m_cBufferList.First();

        /* Check to see if the old restart point is within this buffer */
        if (pOldNextInputByte >= pListBuffer->GetBuffer() &&
            pOldNextInputByte <= pListBuffer->GetBuffer() + pListBuffer->GetSize())
        {
            /*
             * The old restart marker is within this buffer, so
             * we can't delete it. This is because the jpeg library
             * may have to back up into this buffer
             */
            break;
        }

        /* Remove this buffer from the front of the list */
        pMgr->m_cBufferList.PopFront();

        /*
         * Decrement the current index since there's now one
         * less buffer at the beginning of the list
         */
        pMgr->m_lCurrentIndex--;

        /* Release the IHXBuffer object */
        HX_RELEASE(pListBuffer);
    }

    return TRUE;
}

void /*_cdecl*/ CIJGLibraryWrapper::SkipInputData(j_decompress_ptr cinfo, long num_bytes)
{
    /* Check for input error conditions */
    if (cinfo->src == NULL)
    {
        ERREXIT(cinfo, JERR_INPUT_EMPTY);
    }

    /* Get a pointer to a BufferListSrcMgr */
    BufferListSrcMgr *pMgr = (BufferListSrcMgr *) cinfo->src;

    /* If we don't currently have any data, then we're finished */
    if (pMgr->m_cBufferList.Size() == 0)
    {
        return;
    }

    /*
     * All we're going to do for now is skip if we can within the
     * data we have in the current buffer.
     */
    INT32 lLeftOverBytes = pMgr->m_cPubSrcMgr.bytes_in_buffer - num_bytes;
    if (lLeftOverBytes >= 0)
    {
        /* We've got enough in the current buffer */
        pMgr->m_cPubSrcMgr.bytes_in_buffer -= num_bytes;
        pMgr->m_cPubSrcMgr.next_input_byte += num_bytes;
    }
}

void /*_cdecl*/ CIJGLibraryWrapper::TermSource(j_decompress_ptr cinfo)
{
    /* No work to do here */
}

HX_RESULT CIJGLibraryWrapper::TranscodeToRestartInterval(IHXBuffer *      pInputImage,
                                                         UINT32            ulRestartInterval,
                                                         REF(IHXBuffer *) rpOutputImage)
{
    // Initialize the decompression error manager
    WrapperErrorMgr               cErrMgr;
    struct jpeg_decompress_struct cSrcInfo;
    cSrcInfo.err = (struct jpeg_error_mgr *) &cErrMgr;

    // Set up the default methods we won't override
    jpeg_std_error(&cErrMgr.m_cPubErrMgr);

    // Set the fields in the public manager we want to override
    cErrMgr.m_cPubErrMgr.error_exit     = ErrorExit;
    cErrMgr.m_cPubErrMgr.output_message = OutputMessage;

    // Give the string enough to hold the biggest error string
    if (cErrMgr.m_cErrStr.reserve(JMSG_LENGTH_MAX))
    {
        return HXR_OUTOFMEMORY;
    }

    // Forward declare some local variables
    struct jpeg_compress_struct cDstInfo;
    BYTE *                      pDstBuf = NULL;

    // Here's the error return point
    if (setjmp(cErrMgr.m_cSetJmpBuf))
    {
        // If we get here, the JPEG library has signaled a fatal error.
        jpeg_destroy_compress(&cDstInfo);
        jpeg_destroy_decompress(&cSrcInfo);
        HX_VECTOR_DELETE(pDstBuf);
        return HXR_FAIL;
    }

    // Initialize the JPEG decompression object with our error handling
    jpeg_create_decompress(&cSrcInfo);

    // Specify data source for decompression
    jpeg_buffer_src(&cSrcInfo, pInputImage->GetBuffer(), pInputImage->GetSize());

    // Read input file header
    (void) jpeg_read_header(&cSrcInfo, TRUE);

    // Read the DCT coefficients out of the input file
    jvirt_barray_ptr *src_coef_arrays = jpeg_read_coefficients(&cSrcInfo);

    // Create an output buffer the size of the uncompressed image - that
    // will surely be enough
    UINT32 ulDstBufSize = cSrcInfo.image_width * cSrcInfo.image_height * cSrcInfo.num_components;
    pDstBuf             = new BYTE [ulDstBufSize];
    if (!pDstBuf)
    {
        jpeg_destroy_compress(&cDstInfo);
        jpeg_destroy_decompress(&cSrcInfo);
        HX_VECTOR_DELETE(pDstBuf);
        return HXR_OUTOFMEMORY;
    }

    // Initialize the compression error manager
    cDstInfo.err = (struct jpeg_error_mgr *) &cErrMgr;

    // Initialize the JPEG compression object with our error handling.
    jpeg_create_compress(&cDstInfo);

    // Initialize destination compression parameters from source values
    jpeg_copy_critical_parameters(&cSrcInfo, &cDstInfo);

    // Output DCT arrays will be same as input DCT arrays
    jvirt_barray_ptr *dst_coef_arrays = src_coef_arrays;

    // Specify data destination for compression
    jpeg_buffer_dst(&cDstInfo, pDstBuf, ulDstBufSize);

    // Set restart interval
    cDstInfo.restart_interval = ulRestartInterval;
    cDstInfo.restart_in_rows  = 0;

    // Start compressor (note no image data is actually written here)
    jpeg_write_coefficients(&cDstInfo, dst_coef_arrays);

    // Finish compression
    jpeg_finish_compress(&cDstInfo);

    // Compute the output file size
    UINT32 ulOutSize = ulDstBufSize - cDstInfo.dest->free_in_buffer;

    // Destroy the compression object
    jpeg_destroy_compress(&cDstInfo);

    // Finish decompression
    (void) jpeg_finish_decompress(&cSrcInfo);

    // Destroy the decompression object
    jpeg_destroy_decompress(&cSrcInfo);

    // Create an output IHXBuffer
    IHXBuffer *pBuffer = new CHXBuffer();
    if (!pBuffer)
    {
        HX_VECTOR_DELETE(pDstBuf);
        return HXR_OUTOFMEMORY;
    }
    pBuffer->AddRef();

    // Set the output IHXBuffer to the output data
    HX_RESULT retVal = pBuffer->Set(pDstBuf, ulOutSize);
    if (retVal != HXR_OK)
    {
        HX_VECTOR_DELETE(pDstBuf);
        HX_RELEASE(pBuffer);
        return retVal;
    }

    // Now we're done with the intermediate buffer
    HX_VECTOR_DELETE(pDstBuf);

    // Set the outgoing buffer
    rpOutputImage = pBuffer;

    return HXR_OK;
}

HX_RESULT CIJGLibraryWrapper::GetLastOpaqueBuffer(REF(IHXBuffer*) rpOpaque)
{
    HX_RESULT retVal = HXR_FAIL;

    if (m_pLastOpaque)
    {
        HX_RELEASE(rpOpaque);
        rpOpaque = m_pLastOpaque;
        rpOpaque->AddRef();
        retVal   = HXR_OK;
    }

    return retVal;
}

void CIJGLibraryWrapper::SetLastOpaqueBuffer(IHXBuffer* pOpaque)
{
    if (pOpaque)
    {
        HX_RELEASE(m_pLastOpaque);
        m_pLastOpaque = pOpaque;
        m_pLastOpaque->AddRef();
    }
}

void CIJGLibraryWrapper::SetChromaKeyInfo(UINT32 ulKey, UINT32 ulTol, UINT32 ulOp)
{
    m_ulChromaKey         = ulKey;
    m_ulChromaKeyTol      = ulTol;
    m_ulChromaKeyOpacity  = ulOp;
    m_bChromaKeySpecified = TRUE;
}

void CIJGLibraryWrapper::ExpandGrayToRGB(BYTE*  pBuf,
                                         UINT32 ulWidth,
                                         BOOL   bBigEndian)
{
    if (pBuf)
    {
        BYTE*   pGray = pBuf + ulWidth - 1;
        UINT32* pRGB  = ((UINT32*) pBuf) + ulWidth - 1;
        while (ulWidth--)
        {
            *pRGB = ((*pGray) << 16) | ((*pGray) << 8) | (*pGray);
            pRGB--;
            pGray--;
        }
    }
}

void CIJGLibraryWrapper::ProcessOpacityAndChromaKey(BYTE*  pBuf,
                                                    UINT32 ulWidth,
                                                    UINT32 ulOpacity,
                                                    BOOL   bChromaKey,
                                                    UINT32 ulChromaKey,
                                                    UINT32 ulChromaKeyTol,
                                                    UINT32 ulChromaKeyOpacity)
{
    if (pBuf)
    {
        // Clip the opacities
        if (ulOpacity > 255) ulOpacity = 255;
        if (ulChromaKeyOpacity > 255) ulChromaKeyOpacity = 255;
        // Compute alphas (go ahead and pre-shift)
        UINT32 ulAlpha       = (255 - ulOpacity) << 24;
        UINT32 ulChromaAlpha = (255 - ulChromaKeyOpacity) << 24;
        // Determine whether we need to process opacity,
        // chroma key, or both
        if (ulOpacity < 255 && !bChromaKey)
        {
            // Process opacity but not chroma key
            UINT32* pPix = (UINT32*) pBuf;
            while (ulWidth--)
            {
                *pPix = (*pPix & 0x00FFFFFF) | ulAlpha;
                pPix++;
            }
        }
        else if (ulOpacity >= 255 && bChromaKey)
        {
            // Process chroma key but not opacity
            UINT32* pPix = (UINT32*) pBuf;
            while (ulWidth--)
            {
                if (DoesChromaKeyMatch(*pPix, ulChromaKey, ulChromaKeyTol))
                {
                    *pPix = (*pPix & 0x00FFFFFF) | ulChromaAlpha;
                }
                pPix++;
            }
        }
        else if (ulOpacity < 255 && bChromaKey)
        {
            // Compute new chroma alpha
            UINT32 ulNewChromaKeyOpacity = ulChromaKeyOpacity * ulOpacity / 255;
            UINT32 ulNewChromaAlpha      = (255 - ulNewChromaKeyOpacity) << 24;
            // Process both opacity and chroma key
            UINT32* pPix = (UINT32*) pBuf;
            while (ulWidth--)
            {
                if (DoesChromaKeyMatch(*pPix, ulChromaKey, ulChromaKeyTol))
                {
                    *pPix = (*pPix & 0x00FFFFFF) | ulNewChromaAlpha;
                }
                else
                {
                    *pPix = (*pPix & 0x00FFFFFF) | ulAlpha;
                }
                pPix++;
            }
        }
    }
}