output.cpp

SBC2410 WinCE 5.0 BSP.绝大多数驱动已经调通。

            CurrSamp0 = (CurrSamp0 - OUT_SCALE) << 8;
            CurrSamp1 = (LONG)pSampleSrc->s8.sample_right;
            CurrSamp1 = (CurrSamp1 - OUT_SCALE) << 8;
            pCurrData+=2;
        }

        OutSamp0 = PrevSamp0 + (((CurrSamp0 - PrevSamp0) * CurrT) >> 16);
        OutSamp0 = (OutSamp0 * fxpGain) >> VOLSHIFT;

        OutSamp1 = PrevSamp1 + (((CurrSamp1 - PrevSamp1) * CurrT) >> 16);
        OutSamp1 = (OutSamp1 * fxpGain) >> VOLSHIFT;
        CurrT += DeltaT;
        // DEBUGMSG(1, (TEXT("PrevSamp0=0x%x, CurrSamp0=0x%x, CurrT=0x%x, OutSamp0=0x%x\r\n"), PrevSamp0,CurrSamp0,CurrT,OutSamp0));

        if (pBuffer < pBufferLast)
        {
            OutSamp0 += ((HWSAMPLE *)pBuffer)[0];
            OutSamp1 += ((HWSAMPLE *)pBuffer)[1];
#if USE_MIX_SATURATE
            // Handle saturation
            if (OutSamp0>AUDIO_SAMPLE_MAX)
            {
                OutSamp0=AUDIO_SAMPLE_MAX;
            }
            else if (OutSamp0<AUDIO_SAMPLE_MIN)
            {
                OutSamp0=AUDIO_SAMPLE_MIN;
            }
            if (OutSamp1>AUDIO_SAMPLE_MAX)
            {
                OutSamp1=AUDIO_SAMPLE_MAX;
            }
            else if (OutSamp1<AUDIO_SAMPLE_MIN)
            {
                OutSamp1=AUDIO_SAMPLE_MIN;
            }
#endif
        }
        ((HWSAMPLE *)pBuffer)[0] = (HWSAMPLE)OutSamp0;
        ((HWSAMPLE *)pBuffer)[1] = (HWSAMPLE)OutSamp1;

        pBuffer += 2*sizeof(HWSAMPLE);

    }

    Exit:
    m_dwByteCount += (pCurrData - m_lpCurrData);
    m_lpCurrData = pCurrData;
    m_CurrT = CurrT;
    m_PrevSamp[0] = PrevSamp0;
    m_PrevSamp[1] = PrevSamp1;
    m_CurrSamp[0] = CurrSamp0;
    m_CurrSamp[1] = CurrSamp1;
    return pBuffer;
}

PBYTE OutputStreamContextS16::Render2(PBYTE pBuffer, PBYTE pBufferEnd, PBYTE pBufferLast)
{
    LONG CurrT = m_CurrT;
    LONG DeltaT = m_DeltaT;
    LONG CurrSamp0 = m_CurrSamp[0];
    LONG CurrSamp1 = m_CurrSamp[1];
    LONG PrevSamp0 = m_PrevSamp[0];
    LONG PrevSamp1 = m_PrevSamp[1];
    PBYTE pCurrData = m_lpCurrData;
    PBYTE pCurrDataEnd = m_lpCurrDataEnd;
    LONG fxpGain = m_fxpGain;
    LONG OutSamp0;
    LONG OutSamp1;

    while (pBuffer < pBufferEnd)
    {
        while (CurrT >= 0x10000)
        {
            if (pCurrData>=pCurrDataEnd)
            {
                goto Exit;
            }

            CurrT -= 0x10000;

            PrevSamp0 = CurrSamp0;
            PrevSamp1 = CurrSamp1;

            PPCM_SAMPLE pSampleSrc = (PPCM_SAMPLE)pCurrData;
            CurrSamp0 = (LONG)pSampleSrc->s16.sample_left;
            CurrSamp1 = (LONG)pSampleSrc->s16.sample_right;
            pCurrData+=4;
        }

        OutSamp0 = PrevSamp0 + (((CurrSamp0 - PrevSamp0) * CurrT) >> 16);
        OutSamp0 = (OutSamp0 * fxpGain) >> VOLSHIFT;
        OutSamp1 = PrevSamp1 + (((CurrSamp1 - PrevSamp1) * CurrT) >> 16);
        OutSamp1 = (OutSamp1 * fxpGain) >> VOLSHIFT;
        CurrT += DeltaT;
        // DEBUGMSG(1, (TEXT("PrevSamp0=0x%x, CurrSamp0=0x%x, CurrT=0x%x, OutSamp0=0x%x\r\n"), PrevSamp0,CurrSamp0,CurrT,OutSamp0));

        if (pBuffer < pBufferLast)
        {
            OutSamp0 += ((HWSAMPLE *)pBuffer)[0];
            OutSamp1 += ((HWSAMPLE *)pBuffer)[1];
#if USE_MIX_SATURATE
            // Handle saturation
            if (OutSamp0>AUDIO_SAMPLE_MAX)
            {
                OutSamp0=AUDIO_SAMPLE_MAX;
            }
            else if (OutSamp0<AUDIO_SAMPLE_MIN)
            {
                OutSamp0=AUDIO_SAMPLE_MIN;
            }
            if (OutSamp1>AUDIO_SAMPLE_MAX)
            {
                OutSamp1=AUDIO_SAMPLE_MAX;
            }
            else if (OutSamp1<AUDIO_SAMPLE_MIN)
            {
                OutSamp1=AUDIO_SAMPLE_MIN;
            }
#endif
        }
        ((HWSAMPLE *)pBuffer)[0] = (HWSAMPLE)OutSamp0;
        ((HWSAMPLE *)pBuffer)[1] = (HWSAMPLE)OutSamp1;

        pBuffer += 2*sizeof(HWSAMPLE);
    }

    Exit:
    m_dwByteCount += (pCurrData - m_lpCurrData);
    m_lpCurrData = pCurrData;
    m_CurrT = CurrT;
    m_PrevSamp[0] = PrevSamp0;
    m_PrevSamp[1] = PrevSamp1;
    m_CurrSamp[0] = CurrSamp0;
    m_CurrSamp[1] = CurrSamp1;
    return pBuffer;
}

#else

PBYTE OutputStreamContextS8::Render2(PBYTE pBuffer, PBYTE pBufferEnd, PBYTE pBufferLast)
{
    LONG CurrT = m_CurrT;
    LONG DeltaT = m_DeltaT;
    LONG CurrSamp0 = m_CurrSamp[0];
    LONG PrevSamp0 = m_PrevSamp[0];
    PBYTE pCurrData = m_lpCurrData;
    PBYTE pCurrDataEnd = m_lpCurrDataEnd;
    LONG fxpGain = m_fxpGain;
    LONG OutSamp0;

    while (pBuffer < pBufferEnd)
    {
        while (CurrT >= 0x10000)
        {
            if (pCurrData>=pCurrDataEnd)
            {
                goto Exit;
            }

            CurrT -= 0x10000;

            PrevSamp0 = CurrSamp0;

            PPCM_SAMPLE pSampleSrc = (PPCM_SAMPLE)pCurrData;
            CurrSamp0 =  (LONG)pSampleSrc->s8.sample_left;
            CurrSamp0 += (LONG)pSampleSrc->s8.sample_right;
            CurrSamp0 = (CurrSamp0 - 256) << 7;
            pCurrData+=2;
        }

        OutSamp0 = PrevSamp0 + (((CurrSamp0 - PrevSamp0) * CurrT) >> 16);
        OutSamp0 = (OutSamp0 * fxpGain) >> VOLSHIFT;
        CurrT += DeltaT;
        // DEBUGMSG(1, (TEXT("PrevSamp0=0x%x, CurrSamp0=0x%x, CurrT=0x%x, OutSamp0=0x%x\r\n"), PrevSamp0,CurrSamp0,CurrT,OutSamp0));

        if (pBuffer < pBufferLast)
        {
            OutSamp0 += *(HWSAMPLE *)pBuffer;
#if USE_MIX_SATURATE
            // Handle saturation
            if (OutSamp0>AUDIO_SAMPLE_MAX)
            {
                OutSamp0=AUDIO_SAMPLE_MAX;
            }
            else if (OutSamp0<AUDIO_SAMPLE_MIN)
            {
                OutSamp0=AUDIO_SAMPLE_MIN;
            }
#endif
        }
        *(HWSAMPLE *)pBuffer = (HWSAMPLE)OutSamp0;

        pBuffer += sizeof(HWSAMPLE);
    }

    Exit:
    m_dwByteCount += (pCurrData - m_lpCurrData);
    m_lpCurrData = pCurrData;
    m_CurrT = CurrT;
    m_PrevSamp[0] = PrevSamp0;
    m_CurrSamp[0] = CurrSamp0;
    return pBuffer;
}

PBYTE OutputStreamContextS16::Render2(PBYTE pBuffer, PBYTE pBufferEnd, PBYTE pBufferLast)
{
    LONG CurrT = m_CurrT;
    LONG DeltaT = m_DeltaT;
    LONG CurrSamp0 = m_CurrSamp[0];
    LONG PrevSamp0 = m_PrevSamp[0];
    PBYTE pCurrData = m_lpCurrData;
    PBYTE pCurrDataEnd = m_lpCurrDataEnd;
    LONG fxpGain = m_fxpGain;
    LONG OutSamp0;

    while (pBuffer < pBufferEnd)
    {
        while (CurrT >= 0x10000)
        {
            if (pCurrData>=pCurrDataEnd)
            {
                goto Exit;
            }

            CurrT -= 0x10000;

            PrevSamp0 = CurrSamp0;

            PPCM_SAMPLE pSampleSrc = (PPCM_SAMPLE)pCurrData;
            CurrSamp0 =  (LONG)pSampleSrc->s16.sample_left;
            CurrSamp0 += (LONG)pSampleSrc->s16.sample_right;
            CurrSamp0 = CurrSamp0>>1;
            pCurrData+=4;
        }

        OutSamp0 = PrevSamp0 + (((CurrSamp0 - PrevSamp0) * CurrT) >> 16);
        OutSamp0 = (OutSamp0 * fxpGain) >> VOLSHIFT;
        CurrT += DeltaT;
        // DEBUGMSG(1, (TEXT("PrevSamp0=0x%x, CurrSamp0=0x%x, CurrT=0x%x, OutSamp0=0x%x\r\n"), PrevSamp0,CurrSamp0,CurrT,OutSamp0));

        if (pBuffer < pBufferLast)
        {
            OutSamp0 += *(HWSAMPLE *)pBuffer;
#if USE_MIX_SATURATE
            // Handle saturation
            if (OutSamp0>AUDIO_SAMPLE_MAX)
            {
                OutSamp0=AUDIO_SAMPLE_MAX;
            }
            else if (OutSamp0<AUDIO_SAMPLE_MIN)
            {
                OutSamp0=AUDIO_SAMPLE_MIN;
            }
#endif
        }
        *(HWSAMPLE *)pBuffer = (HWSAMPLE)OutSamp0;

        pBuffer += sizeof(HWSAMPLE);

    }

    Exit:
    m_dwByteCount += (pCurrData - m_lpCurrData);
    m_lpCurrData = pCurrData;
    m_CurrT = CurrT;
    m_PrevSamp[0] = PrevSamp0;
    m_CurrSamp[0] = CurrSamp0;
    return pBuffer;
}
#endif