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      1 /******************************************************************************
      2  *
      3  *  Copyright (C) 2014 The Android Open Source Project
      4  *  Copyright 2003 - 2004 Open Interface North America, Inc. All rights
      5  *                        reserved.
      6  *
      7  *  Licensed under the Apache License, Version 2.0 (the "License");
      8  *  you may not use this file except in compliance with the License.
      9  *  You may obtain a copy of the License at:
     10  *
     11  *  http://www.apache.org/licenses/LICENSE-2.0
     12  *
     13  *  Unless required by applicable law or agreed to in writing, software
     14  *  distributed under the License is distributed on an "AS IS" BASIS,
     15  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     16  *  See the License for the specific language governing permissions and
     17  *  limitations under the License.
     18  *
     19  ******************************************************************************/
     20 
     21 #include <stdlib.h>
     22 
     23 #include "oi_codec_sbc_private.h"
     24 
     25 /*******************************************************************************
     26   $Revision: #1 $
     27  ******************************************************************************/
     28 
     29 PRIVATE OI_STATUS OI_CODEC_SBC_Alloc(OI_CODEC_SBC_COMMON_CONTEXT* common,
     30                                      uint32_t* codecDataAligned,
     31                                      uint32_t codecDataBytes,
     32                                      uint8_t maxChannels, uint8_t pcmStride) {
     33   int i;
     34   size_t filterBufferCount;
     35   size_t subdataSize;
     36   OI_BYTE* codecData = (OI_BYTE*)codecDataAligned;
     37 
     38   if (maxChannels < 1 || maxChannels > 2) {
     39     return OI_STATUS_INVALID_PARAMETERS;
     40   }
     41 
     42   if (pcmStride < 1 || pcmStride > maxChannels) {
     43     return OI_STATUS_INVALID_PARAMETERS;
     44   }
     45 
     46   common->maxChannels = maxChannels;
     47   common->pcmStride = pcmStride;
     48 
     49   /* Compute sizes needed for the memory regions, and bail if we don't have
     50    * enough memory for them. */
     51   subdataSize =
     52       maxChannels * sizeof(common->subdata[0]) * SBC_MAX_BANDS * SBC_MAX_BLOCKS;
     53   if (subdataSize > codecDataBytes) {
     54     return OI_STATUS_OUT_OF_MEMORY;
     55   }
     56 
     57   filterBufferCount =
     58       (codecDataBytes - subdataSize) /
     59       (sizeof(common->filterBuffer[0][0]) * SBC_MAX_BANDS * maxChannels);
     60   if (filterBufferCount < SBC_CODEC_MIN_FILTER_BUFFERS) {
     61     return OI_STATUS_OUT_OF_MEMORY;
     62   }
     63   common->filterBufferLen = filterBufferCount * SBC_MAX_BANDS;
     64 
     65   /* Allocate memory for the subband data */
     66   common->subdata = (int32_t*)codecData;
     67   codecData += subdataSize;
     68   OI_ASSERT(codecDataBytes >= subdataSize);
     69   codecDataBytes -= subdataSize;
     70 
     71   /* Allocate memory for the synthesis buffers */
     72   for (i = 0; i < maxChannels; ++i) {
     73     size_t allocSize =
     74         common->filterBufferLen * sizeof(common->filterBuffer[0][0]);
     75     common->filterBuffer[i] = (SBC_BUFFER_T*)codecData;
     76     OI_ASSERT(codecDataBytes >= allocSize);
     77     codecData += allocSize;
     78     codecDataBytes -= allocSize;
     79   }
     80 
     81   return OI_OK;
     82 }
     83