V1.0

2026-06-09 16:39:17 +08:00
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+/******************************************************************************
+ *
+ *  Copyright (C) 2014 The Android Open Source Project
+ *  Copyright 2003 - 2004 Open Interface North America, Inc. All rights reserved.
+ *
+ *  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.
+ *
+ ******************************************************************************/
+
+#include <stdlib.h>
+#include <oi_codec_sbc_private.h>
+
+/**********************************************************************************
+  $Revision: #1 $
+***********************************************************************************/
+
+PRIVATE OI_STATUS OI_CODEC_SBC_Alloc(OI_CODEC_SBC_COMMON_CONTEXT *common,
+                                     OI_UINT32 *codecDataAligned,
+                                     OI_UINT32 codecDataBytes,
+                                     OI_UINT8 maxChannels,
+                                     OI_UINT8 pcmStride)
+{
+    int i;
+    size_t filterBufferCount;
+    size_t subdataSize;
+    OI_BYTE *codecData = (OI_BYTE*)codecDataAligned;
+
+    if ((maxChannels < 1) || (maxChannels > 2)) {
+        return OI_STATUS_INVALID_PARAMETERS;
+    }
+
+    if ((pcmStride < 1) || (pcmStride > maxChannels)) {
+        return OI_STATUS_INVALID_PARAMETERS;
+    }
+
+    common->maxChannels = maxChannels;
+    common->pcmStride = pcmStride;
+
+    /* Compute sizes needed for the memory regions, and bail if we don't have
+     * enough memory for them. */
+    subdataSize = maxChannels * sizeof(common->subdata[0]) * SBC_MAX_BANDS * SBC_MAX_BLOCKS;
+    if (subdataSize > codecDataBytes) {
+        return OI_STATUS_OUT_OF_MEMORY;
+    }
+
+    filterBufferCount = (codecDataBytes - subdataSize) / (sizeof(common->filterBuffer[0][0]) * SBC_MAX_BANDS * maxChannels);
+    if (filterBufferCount < SBC_CODEC_MIN_FILTER_BUFFERS) {
+        return OI_STATUS_OUT_OF_MEMORY;
+    }
+    common->filterBufferLen = (uint32_t) filterBufferCount * SBC_MAX_BANDS;
+
+    /* Allocate memory for the subband data */
+    common->subdata = (OI_INT32*)codecData;
+    codecData += subdataSize;
+    OI_ASSERT(codecDataBytes >= subdataSize);
+    codecDataBytes -= (uint32_t) subdataSize;
+
+    /* Allocate memory for the synthesis buffers */
+    for (i = 0; i < maxChannels; ++i) {
+        size_t allocSize = common->filterBufferLen * sizeof(common->filterBuffer[0][0]);
+        common->filterBuffer[i] = (SBC_BUFFER_T*)codecData;
+        OI_ASSERT(codecDataBytes >= allocSize);
+        codecData += allocSize;
+        codecDataBytes -= (uint32_t) allocSize;
+    }
+
+    return OI_OK;
+}