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Diffstat (limited to 'media/libeffects/lvm/lib/Bass/src/LVDBE_Process.c')
-rwxr-xr-xmedia/libeffects/lvm/lib/Bass/src/LVDBE_Process.c205
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diff --git a/media/libeffects/lvm/lib/Bass/src/LVDBE_Process.c b/media/libeffects/lvm/lib/Bass/src/LVDBE_Process.c
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+++ b/media/libeffects/lvm/lib/Bass/src/LVDBE_Process.c
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+/*
+ * Copyright (C) 2004-2010 NXP Software
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/****************************************************************************************
+
+ $Author: nxp007753 $
+ $Revision: 1081 $
+ $Date: 2010-07-05 11:48:44 +0200 (Mon, 05 Jul 2010) $
+
+*****************************************************************************************/
+
+/****************************************************************************************/
+/* */
+/* Includes */
+/* */
+/****************************************************************************************/
+
+#include "LVDBE.h"
+#include "LVDBE_Private.h"
+#include "VectorArithmetic.h"
+#include "AGC.h"
+#include "LVDBE_Coeffs.h" /* Filter coefficients */
+
+
+/********************************************************************************************/
+/* */
+/* FUNCTION: LVDBE_Process */
+/* */
+/* DESCRIPTION: */
+/* Process function for the Bass Enhancement module. */
+/* */
+/* Data can be processed in two formats, stereo or mono-in-stereo. Data in mono */
+/* format is not supported, the calling routine must convert the mono stream to */
+/* mono-in-stereo. */
+/* ___________ */
+/* ________ | | ________ */
+/* | | _____ |------------------------->| | | | */
+/* | 16-bit | | | | ________ | | | 32-bit | */
+/* -+-->| to |-->| HPF |--| | | _____ | AGC Mixer |-->| to |--| */
+/* | | 32-bit | |_____| | | Stereo | | | | | | 16-bit | | */
+/* | |________| |-->| to |-->| BPF |-->| | |________| 0 */
+/* | | Mono | |_____| |___________| \--> */
+/* | |________| */
+/* | _________ 0 */
+/* | | | | */
+/* |----------------------------------------------------| Volume |-----------------| */
+/* | Control | */
+/* |_________| */
+/* */
+/* PARAMETERS: */
+/* hInstance Instance handle */
+/* pInData Pointer to the input data */
+/* pOutData Pointer to the output data */
+/* NumSamples Number of samples in the input buffer */
+/* */
+/* RETURNS: */
+/* LVDBE_SUCCESS Succeeded */
+/* LVDBE_TOOMANYSAMPLES NumSamples was larger than the maximum block size */
+/* */
+/* NOTES: */
+/* 1. The input and output data must be 32-bit format. The input is scaled by a shift */
+/* when converting from 16-bit format, this scaling allows for internal headroom in the */
+/* bass enhancement algorithm. */
+/* 2. For a 16-bit implementation the converstion to 32-bit is removed and replaced with */
+/* the headroom loss. This headroom loss is compensated in the volume control so the */
+/* overall end to end gain is odB. */
+/* */
+/********************************************************************************************/
+
+LVDBE_ReturnStatus_en LVDBE_Process(LVDBE_Handle_t hInstance,
+ const LVM_INT16 *pInData,
+ LVM_INT16 *pOutData,
+ LVM_UINT16 NumSamples)
+{
+
+ LVDBE_Instance_t *pInstance =(LVDBE_Instance_t *)hInstance;
+ LVM_INT32 *pScratch = (LVM_INT32 *)pInstance->MemoryTable.Region[LVDBE_MEMREGION_SCRATCH].pBaseAddress;
+ LVM_INT32 *pMono = (LVM_INT32 *)pOutData;
+ LVM_INT16 *pInput = (LVM_INT16 *)pInData;
+
+
+ /*
+ * Check the number of samples is not too large
+ */
+ if (NumSamples > pInstance->Capabilities.MaxBlockSize)
+ {
+ return(LVDBE_TOOMANYSAMPLES);
+ }
+
+ /*
+ * Check if the algorithm is enabled
+ */
+ if ((pInstance->Params.OperatingMode != LVDBE_OFF) ||
+ (pInstance->bTransitionOnToOff == LVM_TRUE))
+ {
+
+ /*
+ * Convert 16-bit samples to 32-bit and scale
+ * (For a 16-bit implementation apply headroom loss here)
+ */
+ Int16LShiftToInt32_16x32(pInput, /* Source 16-bit data */
+ pScratch, /* Destination 32-bit data */
+ (LVM_INT16)(2*NumSamples), /* Left and right */
+ LVDBE_SCALESHIFT); /* Shift scale */
+
+
+ /*
+ * Apply the high pass filter if selected
+ */
+ if (pInstance->Params.HPFSelect == LVDBE_HPF_ON)
+ {
+ BQ_2I_D32F32C30_TRC_WRA_01(&pInstance->pCoef->HPFInstance, /* Filter instance */
+ (LVM_INT32 *)pScratch, /* Source */
+ (LVM_INT32 *)pScratch, /* Destination */
+ (LVM_INT16)NumSamples); /* Number of samples */
+ }
+
+
+ /*
+ * Create the mono stream
+ */
+ From2iToMono_32(pScratch, /* Stereo source */
+ pMono, /* Mono destination */
+ (LVM_INT16)NumSamples); /* Number of samples */
+
+
+ /*
+ * Apply the band pass filter
+ */
+ BP_1I_D32F32C30_TRC_WRA_02(&pInstance->pCoef->BPFInstance, /* Filter instance */
+ (LVM_INT32 *)pMono, /* Source */
+ (LVM_INT32 *)pMono, /* Destination */
+ (LVM_INT16)NumSamples); /* Number of samples */
+
+
+ /*
+ * Apply the AGC and mix
+ */
+ AGC_MIX_VOL_2St1Mon_D32_WRA(&pInstance->pData->AGCInstance, /* Instance pointer */
+ pScratch, /* Stereo source */
+ pMono, /* Mono band pass source */
+ pScratch, /* Stereo destination */
+ NumSamples); /* Number of samples */
+
+ if(pInstance->bTransitionOnToOff == LVM_TRUE)
+ {
+ if ((pInstance->pData->AGCInstance.AGC_Gain == pInstance->pData->AGCInstance.AGC_Target)&&
+ (pInstance->pData->AGCInstance.AGC_Gain == 0))
+ {
+ pInstance->bTransitionOnToOff = LVM_FALSE;
+ }
+ }
+
+
+
+ /*
+ * Convert 32-bit samples to 16-bit and saturate
+ * (Not required for 16-bit implemenations)
+ */
+ Int32RShiftToInt16_Sat_32x16(pScratch, /* Source 32-bit data */
+ pOutData, /* Destination 16-bit data */
+ (LVM_INT16)(2*NumSamples), /* Left and right */
+ LVDBE_SCALESHIFT); /* Shift scale */
+
+ }
+ else
+ {
+
+ /*
+ * The algorithm is disabled but volume management is required to compensate for
+ * headroom and volume (if enabled)
+ */
+ LVC_MixSoft_1St_D16C31_SAT(&pInstance->pData->BypassVolume,
+ pInData,
+ pOutData,
+ (LVM_INT16)(2*NumSamples)); /* Left and right */
+
+ }
+
+ return(LVDBE_SUCCESS);
+}
+
+
+
+
+
+
+
+
+
+
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