media/libstagefright/codecs/aacdec/sbr_reset_dec.cpp - third_party/android/platform/frameworks/av - Git at Google

 /* ------------------------------------------------------------------
  * Copyright (C) 1998-2009 PacketVideo
  *
  * 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.
  * -------------------------------------------------------------------
  */
 /*

  Filename: sbr_reset_dec.c

 ------------------------------------------------------------------------------
  REVISION HISTORY


  Who:                                   Date: MM/DD/YYYY
  Description:

 ------------------------------------------------------------------------------
  INPUT AND OUTPUT DEFINITIONS


 ------------------------------------------------------------------------------
  FUNCTION DESCRIPTION

     resets sbr decoder structure
 ------------------------------------------------------------------------------
  REQUIREMENTS


 ------------------------------------------------------------------------------
  REFERENCES

 SC 29 Software Copyright Licencing Disclaimer:

 This software module was originally developed by
   Coding Technologies

 and edited by
   -

 in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3
 standards for reference purposes and its performance may not have been
 optimized. This software module is an implementation of one or more tools as
 specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards.
 ISO/IEC gives users free license to this software module or modifications
 thereof for use in products claiming conformance to audiovisual and
 image-coding related ITU Recommendations and/or ISO/IEC International
 Standards. ISO/IEC gives users the same free license to this software module or
 modifications thereof for research purposes and further ISO/IEC standardisation.
 Those intending to use this software module in products are advised that its
 use may infringe existing patents. ISO/IEC have no liability for use of this
 software module or modifications thereof. Copyright is not released for
 products that do not conform to audiovisual and image-coding related ITU
 Recommendations and/or ISO/IEC International Standards.
 The original developer retains full right to modify and use the code for its
 own purpose, assign or donate the code to a third party and to inhibit third
 parties from using the code for products that do not conform to audiovisual and
 image-coding related ITU Recommendations and/or ISO/IEC International Standards.
 This copyright notice must be included in all copies or derivative works.
 Copyright (c) ISO/IEC 2002.

 ------------------------------------------------------------------------------
  PSEUDO-CODE

 ------------------------------------------------------------------------------
 */


 /*----------------------------------------------------------------------------
 ; INCLUDES
 ----------------------------------------------------------------------------*/
 #ifdef AAC_PLUS

 #include    "sbr_dec.h"

 #include    "pv_log2.h"
 #include    "fxp_mul32.h"


 #include    "sbr_reset_dec.h"
 #include    "sbr_find_start_andstop_band.h"
 #include    "sbr_update_freq_scale.h"
 #include    "sbr_downsample_lo_res.h"

 /*----------------------------------------------------------------------------
 ; MACROS
 ; Define module specific macros here
 ----------------------------------------------------------------------------*/


 /*----------------------------------------------------------------------------
 ; DEFINES
 ; Include all pre-processor statements here. Include conditional
 ; compile variables also.
 ----------------------------------------------------------------------------*/

 /*----------------------------------------------------------------------------
 ; LOCAL FUNCTION DEFINITIONS
 ; Function Prototype declaration
 ----------------------------------------------------------------------------*/

 /*----------------------------------------------------------------------------
 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS
 ; Variable declaration - defined here and used outside this module
 ----------------------------------------------------------------------------*/

 /*----------------------------------------------------------------------------
 ; EXTERNAL FUNCTION REFERENCES
 ; Declare functions defined elsewhere and referenced in this module
 ----------------------------------------------------------------------------*/

 /*----------------------------------------------------------------------------
 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
 ; Declare variables used in this module but defined elsewhere
 ----------------------------------------------------------------------------*/

 /*----------------------------------------------------------------------------
 ; FUNCTION CODE
 ----------------------------------------------------------------------------*/

 SBR_ERROR sbr_reset_dec(SBR_FRAME_DATA * hFrameData,
                         SBR_DEC * sbrDec,
                         Int32 upsampleFac)
 {

     SBR_ERROR err = SBRDEC_OK;
     Int lsbM;
     Int lsb;
     Int usb;
     Int32 i;
     Int32 tmp_q1;

     SBR_HEADER_DATA *headerData  = &(hFrameData->sbr_header);
     Int32           samplingFreq = sbrDec->outSampleRate;

     hFrameData->reset_flag = 1;

     /*Calculate master frequency function */
     err = sbr_find_start_andstop_band(samplingFreq,
                                       headerData->startFreq,
                                       headerData->stopFreq,
                                       &lsbM,
                                       &usb);

     if (err != SBRDEC_OK)
     {
         return err;
     }

     /* Calculate new v_k_master if needed */
     if (headerData->masterStatus == MASTER_RESET)
     {
         sbr_update_freq_scale(sbrDec->V_k_master,
                               &(sbrDec->Num_Master),
                               lsbM,
                               usb,
                               headerData->freqScale,
                               headerData->alterScale,
                               0);

     }

     /*Derive Hiresolution from master frequency function*/

     sbrDec->NSfb[HI] = sbrDec->Num_Master - headerData->xover_band;

     for (i = headerData->xover_band; i <= sbrDec->Num_Master; i++)
     {
         sbrDec->FreqBandTable[HI][i-headerData->xover_band] = (Int)sbrDec->V_k_master[i];
     }


     if ((sbrDec->NSfb[HI] & 0x01) == 0) /* if even number of hires bands */
     {

         sbrDec->NSfb[LO] = sbrDec->NSfb[HI] >> 1;
         /* Use every second lo-res=hi-res[0,2,4...] */
         for (i = 0; i <= sbrDec->NSfb[LO]; i++)
         {
             sbrDec->FreqBandTable[LO][i] = sbrDec->FreqBandTable[HI][(i<<1)];
         }
     }
     else
     {            /* odd number of hi-res which means xover is odd */

         sbrDec->NSfb[LO] = (sbrDec->NSfb[HI] + 1) >> 1;
         /* Use lo-res=hi-res[0,1,3,5 ...] */
         sbrDec->FreqBandTable[LO][0] = sbrDec->FreqBandTable[HI][0];
         for (i = 1; i <= sbrDec->NSfb[LO]; i++)
         {
             sbrDec->FreqBandTable[LO][i] = sbrDec->FreqBandTable[HI][(i<<1)-1];
         }

     }

     lsb = sbrDec->FreqBandTable[LOW_RES][0];
     usb = sbrDec->FreqBandTable[LOW_RES][sbrDec->NSfb[LOW_RES]];

     sbrDec->lowSubband  = lsb;
     sbrDec->highSubband = usb;
     sbrDec->noSubbands  = usb - lsb;

     if ((lsb > 32) || (sbrDec->noSubbands <= 0))
     {
         return SBRDEC_ILLEGAL_SCFACTORS;   /* invalid bands */
     }

     /* Calculate number of noise bands */
     if (headerData->noise_bands == 0)
     {
         sbrDec->NoNoiseBands = 1;
     }
     else /* Calculate number of noise bands 1,2 or 3 bands/octave */
     {

         if (! lsb)
         {
             return SBRDEC_ILLEGAL_SCFACTORS;   /* avoid div by 0 */
         }

         tmp_q1 = pv_log2((usb << 20) / lsb);

         tmp_q1 = fxp_mul32_Q15(headerData->noise_bands, tmp_q1);

         sbrDec->NoNoiseBands = (tmp_q1 + 16) >> 5;

         if (sbrDec->NoNoiseBands == 0)
         {
             sbrDec->NoNoiseBands = 1;
         }
     }

     headerData->noNoiseBands = sbrDec->NoNoiseBands;

     /* Get noise bands */
     sbr_downsample_lo_res(sbrDec->FreqBandTableNoise,
                           sbrDec->NoNoiseBands,
                           sbrDec->FreqBandTable[LO],
                           sbrDec->NSfb[LO]);

     sbrDec->sbStopCodec = sbrDec->lowSubband;

     if (sbrDec->sbStopCodec > (upsampleFac << 5))
     {
         sbrDec->sbStopCodec = (upsampleFac << 5);
     }

     hFrameData->nSfb[LO] = sbrDec->NSfb[LO];
     hFrameData->nSfb[HI] = sbrDec->NSfb[HI];
     hFrameData->nNfb     = hFrameData->sbr_header.noNoiseBands;
     hFrameData->offset   = ((hFrameData->nSfb[LO]) << 1) - hFrameData->nSfb[HI];

     return (SBRDEC_OK);
 }

 #endif
	/* ------------------------------------------------------------------
	* Copyright (C) 1998-2009 PacketVideo
	*
	* 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.
	* -------------------------------------------------------------------
	*/
	/*

	Filename: sbr_reset_dec.c

	------------------------------------------------------------------------------
	REVISION HISTORY


	Who: Date: MM/DD/YYYY
	Description:

	------------------------------------------------------------------------------
	INPUT AND OUTPUT DEFINITIONS



	------------------------------------------------------------------------------
	FUNCTION DESCRIPTION

	resets sbr decoder structure
	------------------------------------------------------------------------------
	REQUIREMENTS


	------------------------------------------------------------------------------
	REFERENCES

	SC 29 Software Copyright Licencing Disclaimer:

	This software module was originally developed by
	Coding Technologies

	and edited by
	-

	in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3
	standards for reference purposes and its performance may not have been
	optimized. This software module is an implementation of one or more tools as
	specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards.
	ISO/IEC gives users free license to this software module or modifications
	thereof for use in products claiming conformance to audiovisual and
	image-coding related ITU Recommendations and/or ISO/IEC International
	Standards. ISO/IEC gives users the same free license to this software module or
	modifications thereof for research purposes and further ISO/IEC standardisation.
	Those intending to use this software module in products are advised that its
	use may infringe existing patents. ISO/IEC have no liability for use of this
	software module or modifications thereof. Copyright is not released for
	products that do not conform to audiovisual and image-coding related ITU
	Recommendations and/or ISO/IEC International Standards.
	The original developer retains full right to modify and use the code for its
	own purpose, assign or donate the code to a third party and to inhibit third
	parties from using the code for products that do not conform to audiovisual and
	image-coding related ITU Recommendations and/or ISO/IEC International Standards.
	This copyright notice must be included in all copies or derivative works.
	Copyright (c) ISO/IEC 2002.

	------------------------------------------------------------------------------
	PSEUDO-CODE

	------------------------------------------------------------------------------
	*/


	/*----------------------------------------------------------------------------
	; INCLUDES
	----------------------------------------------------------------------------*/
	#ifdef AAC_PLUS

	#include "sbr_dec.h"

	#include "pv_log2.h"
	#include "fxp_mul32.h"


	#include "sbr_reset_dec.h"
	#include "sbr_find_start_andstop_band.h"
	#include "sbr_update_freq_scale.h"
	#include "sbr_downsample_lo_res.h"

	/*----------------------------------------------------------------------------
	; MACROS
	; Define module specific macros here
	----------------------------------------------------------------------------*/


	/*----------------------------------------------------------------------------
	; DEFINES
	; Include all pre-processor statements here. Include conditional
	; compile variables also.
	----------------------------------------------------------------------------*/

	/*----------------------------------------------------------------------------
	; LOCAL FUNCTION DEFINITIONS
	; Function Prototype declaration
	----------------------------------------------------------------------------*/

	/*----------------------------------------------------------------------------
	; LOCAL STORE/BUFFER/POINTER DEFINITIONS
	; Variable declaration - defined here and used outside this module
	----------------------------------------------------------------------------*/

	/*----------------------------------------------------------------------------
	; EXTERNAL FUNCTION REFERENCES
	; Declare functions defined elsewhere and referenced in this module
	----------------------------------------------------------------------------*/

	/*----------------------------------------------------------------------------
	; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
	; Declare variables used in this module but defined elsewhere
	----------------------------------------------------------------------------*/

	/*----------------------------------------------------------------------------
	; FUNCTION CODE
	----------------------------------------------------------------------------*/

	SBR_ERROR sbr_reset_dec(SBR_FRAME_DATA * hFrameData,
	SBR_DEC * sbrDec,
	Int32 upsampleFac)
	{

	SBR_ERROR err = SBRDEC_OK;
	Int lsbM;
	Int lsb;
	Int usb;
	Int32 i;
	Int32 tmp_q1;

	SBR_HEADER_DATA *headerData = &(hFrameData->sbr_header);
	Int32 samplingFreq = sbrDec->outSampleRate;

	hFrameData->reset_flag = 1;

	/Calculate master frequency function /
	err = sbr_find_start_andstop_band(samplingFreq,
	headerData->startFreq,
	headerData->stopFreq,
	&lsbM,
	&usb);

	if (err != SBRDEC_OK)
	{
	return err;
	}

	/* Calculate new v_k_master if needed */
	if (headerData->masterStatus == MASTER_RESET)
	{
	sbr_update_freq_scale(sbrDec->V_k_master,
	&(sbrDec->Num_Master),
	lsbM,
	usb,
	headerData->freqScale,
	headerData->alterScale,
	0);

	}

	/Derive Hiresolution from master frequency function/

	sbrDec->NSfb[HI] = sbrDec->Num_Master - headerData->xover_band;

	for (i = headerData->xover_band; i <= sbrDec->Num_Master; i++)
	{
	sbrDec->FreqBandTable[HI][i-headerData->xover_band] = (Int)sbrDec->V_k_master[i];
	}


	if ((sbrDec->NSfb[HI] & 0x01) == 0) /* if even number of hires bands */
	{

	sbrDec->NSfb[LO] = sbrDec->NSfb[HI] >> 1;
	/* Use every second lo-res=hi-res[0,2,4...] */
	for (i = 0; i <= sbrDec->NSfb[LO]; i++)
	{
	sbrDec->FreqBandTable[LO][i] = sbrDec->FreqBandTable[HI][(i<<1)];
	}
	}
	else
	{ /* odd number of hi-res which means xover is odd */

	sbrDec->NSfb[LO] = (sbrDec->NSfb[HI] + 1) >> 1;
	/* Use lo-res=hi-res[0,1,3,5 ...] */
	sbrDec->FreqBandTable[LO][0] = sbrDec->FreqBandTable[HI][0];
	for (i = 1; i <= sbrDec->NSfb[LO]; i++)
	{
	sbrDec->FreqBandTable[LO][i] = sbrDec->FreqBandTable[HI][(i<<1)-1];
	}

	}

	lsb = sbrDec->FreqBandTable[LOW_RES][0];
	usb = sbrDec->FreqBandTable[LOW_RES][sbrDec->NSfb[LOW_RES]];

	sbrDec->lowSubband = lsb;
	sbrDec->highSubband = usb;
	sbrDec->noSubbands = usb - lsb;

	if ((lsb > 32) \|\| (sbrDec->noSubbands <= 0))
	{
	return SBRDEC_ILLEGAL_SCFACTORS; /* invalid bands */
	}

	/* Calculate number of noise bands */
	if (headerData->noise_bands == 0)
	{
	sbrDec->NoNoiseBands = 1;
	}
	else /* Calculate number of noise bands 1,2 or 3 bands/octave */
	{

	if (! lsb)
	{
	return SBRDEC_ILLEGAL_SCFACTORS; /* avoid div by 0 */
	}

	tmp_q1 = pv_log2((usb << 20) / lsb);

	tmp_q1 = fxp_mul32_Q15(headerData->noise_bands, tmp_q1);

	sbrDec->NoNoiseBands = (tmp_q1 + 16) >> 5;

	if (sbrDec->NoNoiseBands == 0)
	{
	sbrDec->NoNoiseBands = 1;
	}
	}

	headerData->noNoiseBands = sbrDec->NoNoiseBands;

	/* Get noise bands */
	sbr_downsample_lo_res(sbrDec->FreqBandTableNoise,
	sbrDec->NoNoiseBands,
	sbrDec->FreqBandTable[LO],
	sbrDec->NSfb[LO]);

	sbrDec->sbStopCodec = sbrDec->lowSubband;

	if (sbrDec->sbStopCodec > (upsampleFac << 5))
	{
	sbrDec->sbStopCodec = (upsampleFac << 5);
	}

	hFrameData->nSfb[LO] = sbrDec->NSfb[LO];
	hFrameData->nSfb[HI] = sbrDec->NSfb[HI];
	hFrameData->nNfb = hFrameData->sbr_header.noNoiseBands;
	hFrameData->offset = ((hFrameData->nSfb[LO]) << 1) - hFrameData->nSfb[HI];

	return (SBRDEC_OK);
	}

	#endif