source/use_case/noise_reduction/src/UseCaseHandler.cc - ml/ethos-u/ml-embedded-evaluation-kit - Gitiles

 /*
  * SPDX-FileCopyrightText: Copyright 2021-2022 Arm Limited and/or its affiliates <open-source-office@arm.com>
  * SPDX-License-Identifier: Apache-2.0
  *
  * 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 "hal.h"
 #include "UseCaseHandler.hpp"
 #include "UseCaseCommonUtils.hpp"
 #include "AudioUtils.hpp"
 #include "ImageUtils.hpp"
 #include "InputFiles.hpp"
 #include "RNNoiseModel.hpp"
 #include "RNNoiseFeatureProcessor.hpp"
 #include "RNNoiseProcessing.hpp"
 #include "log_macros.h"

 namespace arm {
 namespace app {

     /**
     * @brief            Helper function to increment current audio clip features index.
     * @param[in,out]    ctx   Pointer to the application context object.
     **/
     static void IncrementAppCtxClipIdx(ApplicationContext& ctx);

     /* Noise reduction inference handler. */
     bool NoiseReductionHandler(ApplicationContext& ctx, bool runAll)
     {
         constexpr uint32_t dataPsnTxtInfStartX = 20;
         constexpr uint32_t dataPsnTxtInfStartY = 40;

         /* Variables used for memory dumping. */
         size_t memDumpMaxLen = 0;
         uint8_t* memDumpBaseAddr = nullptr;
         size_t undefMemDumpBytesWritten = 0;
         size_t* pMemDumpBytesWritten = &undefMemDumpBytesWritten;
         if (ctx.Has("MEM_DUMP_LEN") && ctx.Has("MEM_DUMP_BASE_ADDR") && ctx.Has("MEM_DUMP_BYTE_WRITTEN")) {
             memDumpMaxLen = ctx.Get<size_t>("MEM_DUMP_LEN");
             memDumpBaseAddr = ctx.Get<uint8_t*>("MEM_DUMP_BASE_ADDR");
             pMemDumpBytesWritten = ctx.Get<size_t*>("MEM_DUMP_BYTE_WRITTEN");
         }
         std::reference_wrapper<size_t> memDumpBytesWritten = std::ref(*pMemDumpBytesWritten);
         auto& profiler = ctx.Get<Profiler&>("profiler");

         /* Get model reference. */
         auto& model = ctx.Get<RNNoiseModel&>("model");
         if (!model.IsInited()) {
             printf_err("Model is not initialised! Terminating processing.\n");
             return false;
         }

         /* Populate Pre-Processing related parameters. */
         auto audioFrameLen = ctx.Get<uint32_t>("frameLength");
         auto audioFrameStride = ctx.Get<uint32_t>("frameStride");
         auto nrNumInputFeatures = ctx.Get<uint32_t>("numInputFeatures");

         TfLiteTensor* inputTensor = model.GetInputTensor(0);
         if (nrNumInputFeatures != inputTensor->bytes) {
             printf_err("Input features size must be equal to input tensor size."
                        " Feature size = %" PRIu32 ", Tensor size = %zu.\n",
                        nrNumInputFeatures, inputTensor->bytes);
             return false;
         }

         TfLiteTensor* outputTensor = model.GetOutputTensor(model.m_indexForModelOutput);

         /* Initial choice of index for WAV file. */
         auto startClipIdx = ctx.Get<uint32_t>("clipIndex");

         std::function<const int16_t* (const uint32_t)> audioAccessorFunc = get_audio_array;
         if (ctx.Has("features")) {
             audioAccessorFunc = ctx.Get<std::function<const int16_t* (const uint32_t)>>("features");
         }
         std::function<uint32_t (const uint32_t)> audioSizeAccessorFunc = get_audio_array_size;
         if (ctx.Has("featureSizes")) {
             audioSizeAccessorFunc = ctx.Get<std::function<uint32_t (const uint32_t)>>("featureSizes");
         }
         std::function<const char*(const uint32_t)> audioFileAccessorFunc = get_filename;
         if (ctx.Has("featureFileNames")) {
             audioFileAccessorFunc = ctx.Get<std::function<const char*(const uint32_t)>>("featureFileNames");
         }
         do {
             hal_lcd_clear(COLOR_BLACK);

             auto startDumpAddress = memDumpBaseAddr + memDumpBytesWritten;
             auto currentIndex = ctx.Get<uint32_t>("clipIndex");

             /* Creating a sliding window through the audio. */
             auto audioDataSlider = audio::SlidingWindow<const int16_t>(
                     audioAccessorFunc(currentIndex),
                     audioSizeAccessorFunc(currentIndex), audioFrameLen,
                     audioFrameStride);

             info("Running inference on input feature map %" PRIu32 " => %s\n", currentIndex,
                  audioFileAccessorFunc(currentIndex));

             memDumpBytesWritten += DumpDenoisedAudioHeader(audioFileAccessorFunc(currentIndex),
                                                            (audioDataSlider.TotalStrides() + 1) * audioFrameLen,
                  memDumpBaseAddr + memDumpBytesWritten,
                  memDumpMaxLen - memDumpBytesWritten);

             /* Set up pre and post-processing. */
             std::shared_ptr<rnn::RNNoiseFeatureProcessor> featureProcessor =
                     std::make_shared<rnn::RNNoiseFeatureProcessor>();
             std::shared_ptr<rnn::FrameFeatures> frameFeatures =
                     std::make_shared<rnn::FrameFeatures>();

             RNNoisePreProcess preProcess = RNNoisePreProcess(inputTensor, featureProcessor, frameFeatures);

             std::vector<int16_t> denoisedAudioFrame(audioFrameLen);
             RNNoisePostProcess postProcess = RNNoisePostProcess(outputTensor, denoisedAudioFrame,
                     featureProcessor, frameFeatures);

             bool resetGRU = true;

             while (audioDataSlider.HasNext()) {
                 const int16_t* inferenceWindow = audioDataSlider.Next();

                 if (!preProcess.DoPreProcess(inferenceWindow, audioFrameLen)) {
                     printf_err("Pre-processing failed.");
                     return false;
                 }

                 /* Reset or copy over GRU states first to avoid TFLu memory overlap issues. */
                 if (resetGRU){
                     model.ResetGruState();
                 } else {
                     /* Copying gru state outputs to gru state inputs.
                      * Call ResetGruState in between the sequence of inferences on unrelated input data. */
                     model.CopyGruStates();
                 }

                 /* Strings for presentation/logging. */
                 std::string str_inf{"Running inference... "};

                 /* Display message on the LCD - inference running. */
                 hal_lcd_display_text(str_inf.c_str(), str_inf.size(),
                         dataPsnTxtInfStartX, dataPsnTxtInfStartY, false);

                 info("Inference %zu/%zu\n", audioDataSlider.Index() + 1, audioDataSlider.TotalStrides() + 1);

                 /* Run inference over this feature sliding window. */
                 if (!RunInference(model, profiler)) {
                     printf_err("Inference failed.");
                     return false;
                 }
                 resetGRU = false;

                 /* Carry out post-processing. */
                 if (!postProcess.DoPostProcess()) {
                     printf_err("Post-processing failed.");
                     return false;
                 }

                 /* Erase. */
                 str_inf = std::string(str_inf.size(), ' ');
                 hal_lcd_display_text(str_inf.c_str(), str_inf.size(),
                         dataPsnTxtInfStartX, dataPsnTxtInfStartY, false);

                 if (memDumpMaxLen > 0) {
                     /* Dump final post processed output to memory. */
                     memDumpBytesWritten += DumpOutputDenoisedAudioFrame(
                             denoisedAudioFrame,
                             memDumpBaseAddr + memDumpBytesWritten,
                             memDumpMaxLen - memDumpBytesWritten);
                 }
             }

             if (memDumpMaxLen > 0) {
                 /* Needed to not let the compiler complain about type mismatch. */
                 size_t valMemDumpBytesWritten = memDumpBytesWritten;
                 info("Output memory dump of %zu bytes written at address 0x%p\n",
                      valMemDumpBytesWritten, startDumpAddress);
             }

             /* Finish by dumping the footer. */
             DumpDenoisedAudioFooter(memDumpBaseAddr + memDumpBytesWritten, memDumpMaxLen - memDumpBytesWritten);

             info("All inferences for audio clip complete.\n");
             profiler.PrintProfilingResult();
             IncrementAppCtxClipIdx(ctx);

             std::string clearString{' '};
             hal_lcd_display_text(clearString.c_str(), clearString.size(),
                     dataPsnTxtInfStartX, dataPsnTxtInfStartY, false);

             std::string completeMsg{"Inference complete!"};

             /* Display message on the LCD - inference complete. */
             hal_lcd_display_text(completeMsg.c_str(), completeMsg.size(),
                     dataPsnTxtInfStartX, dataPsnTxtInfStartY, false);

         } while (runAll && ctx.Get<uint32_t>("clipIndex") != startClipIdx);

         return true;
     }

     size_t DumpDenoisedAudioHeader(const char* filename, size_t dumpSize,
                                    uint8_t* memAddress, size_t memSize){

         if (memAddress == nullptr){
             return 0;
         }

         int32_t filenameLength = strlen(filename);
         size_t numBytesWritten = 0;
         size_t numBytesToWrite = 0;
         int32_t dumpSizeByte = dumpSize * sizeof(int16_t);
         bool overflow = false;

         /* Write the filename length */
         numBytesToWrite = sizeof(filenameLength);
         if (memSize - numBytesToWrite > 0) {
             std::memcpy(memAddress, &filenameLength, numBytesToWrite);
             numBytesWritten += numBytesToWrite;
             memSize -= numBytesWritten;
         } else {
             overflow = true;
         }

         /* Write file name */
         numBytesToWrite = filenameLength;
         if(memSize - numBytesToWrite > 0) {
             std::memcpy(memAddress + numBytesWritten, filename, numBytesToWrite);
             numBytesWritten += numBytesToWrite;
             memSize -= numBytesWritten;
         } else {
             overflow = true;
         }

         /* Write dumpSize in byte */
         numBytesToWrite = sizeof(dumpSizeByte);
         if(memSize  - numBytesToWrite > 0) {
             std::memcpy(memAddress + numBytesWritten, &(dumpSizeByte), numBytesToWrite);
             numBytesWritten += numBytesToWrite;
             memSize -= numBytesWritten;
         } else {
             overflow = true;
         }

         if(false == overflow) {
             info("Audio Clip dump header info (%zu bytes) written to %p\n", numBytesWritten,  memAddress);
         } else {
             printf_err("Not enough memory to dump Audio Clip header.\n");
         }

         return numBytesWritten;
     }

     size_t DumpDenoisedAudioFooter(uint8_t* memAddress, size_t memSize){
         if ((memAddress == nullptr) || (memSize < 4)) {
             return 0;
         }
         const int32_t eofMarker = -1;
         std::memcpy(memAddress, &eofMarker, sizeof(int32_t));

         return sizeof(int32_t);
      }

     size_t DumpOutputDenoisedAudioFrame(const std::vector<int16_t>& audioFrame,
                                         uint8_t* memAddress, size_t memSize)
     {
         if (memAddress == nullptr) {
             return 0;
         }

         size_t numByteToBeWritten = audioFrame.size() * sizeof(int16_t);
         if( numByteToBeWritten > memSize) {
             printf_err("Overflow error: Writing %zu of %zu bytes to memory @ 0x%p.\n", memSize, numByteToBeWritten, memAddress);
             numByteToBeWritten = memSize;
         }

         std::memcpy(memAddress, audioFrame.data(), numByteToBeWritten);
         info("Copied %zu bytes to %p\n", numByteToBeWritten,  memAddress);

         return numByteToBeWritten;
     }

     size_t DumpOutputTensorsToMemory(Model& model, uint8_t* memAddress, const size_t memSize)
     {
         const size_t numOutputs = model.GetNumOutputs();
         size_t numBytesWritten = 0;
         uint8_t* ptr = memAddress;

         /* Iterate over all output tensors. */
         for (size_t i = 0; i < numOutputs; ++i) {
             const TfLiteTensor* tensor = model.GetOutputTensor(i);
             const auto* tData = tflite::GetTensorData<uint8_t>(tensor);
 #if VERIFY_TEST_OUTPUT
             DumpTensor(tensor);
 #endif /* VERIFY_TEST_OUTPUT */
             /* Ensure that we don't overflow the allowed limit. */
             if (numBytesWritten + tensor->bytes <= memSize) {
                 if (tensor->bytes > 0) {
                     std::memcpy(ptr, tData, tensor->bytes);

                     info("Copied %zu bytes for tensor %zu to 0x%p\n",
                         tensor->bytes, i, ptr);

                     numBytesWritten += tensor->bytes;
                     ptr += tensor->bytes;
                 }
             } else {
                 printf_err("Error writing tensor %zu to memory @ 0x%p\n",
                     i, memAddress);
                 break;
             }
         }

         info("%zu bytes written to memory @ 0x%p\n", numBytesWritten, memAddress);

         return numBytesWritten;
     }

     static void IncrementAppCtxClipIdx(ApplicationContext& ctx)
     {
         auto curClipIdx = ctx.Get<uint32_t>("clipIndex");
         if (curClipIdx + 1 >= NUMBER_OF_FILES) {
             ctx.Set<uint32_t>("clipIndex", 0);
             return;
         }
         ++curClipIdx;
         ctx.Set<uint32_t>("clipIndex", curClipIdx);
     }

 } /* namespace app */
 } /* namespace arm */
	/*
	* SPDX-FileCopyrightText: Copyright 2021-2022 Arm Limited and/or its affiliates <open-source-office@arm.com>
	* SPDX-License-Identifier: Apache-2.0
	*
	* 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 "hal.h"
	#include "UseCaseHandler.hpp"
	#include "UseCaseCommonUtils.hpp"
	#include "AudioUtils.hpp"
	#include "ImageUtils.hpp"
	#include "InputFiles.hpp"
	#include "RNNoiseModel.hpp"
	#include "RNNoiseFeatureProcessor.hpp"
	#include "RNNoiseProcessing.hpp"
	#include "log_macros.h"

	namespace arm {
	namespace app {

	/**
	* @brief Helper function to increment current audio clip features index.
	* @param[in,out] ctx Pointer to the application context object.
	**/
	static void IncrementAppCtxClipIdx(ApplicationContext& ctx);

	/* Noise reduction inference handler. */
	bool NoiseReductionHandler(ApplicationContext& ctx, bool runAll)
	{
	constexpr uint32_t dataPsnTxtInfStartX = 20;
	constexpr uint32_t dataPsnTxtInfStartY = 40;

	/* Variables used for memory dumping. */
	size_t memDumpMaxLen = 0;
	uint8_t* memDumpBaseAddr = nullptr;
	size_t undefMemDumpBytesWritten = 0;
	size_t* pMemDumpBytesWritten = &undefMemDumpBytesWritten;
	if (ctx.Has("MEM_DUMP_LEN") && ctx.Has("MEM_DUMP_BASE_ADDR") && ctx.Has("MEM_DUMP_BYTE_WRITTEN")) {
	memDumpMaxLen = ctx.Get<size_t>("MEM_DUMP_LEN");
	memDumpBaseAddr = ctx.Get<uint8_t*>("MEM_DUMP_BASE_ADDR");
	pMemDumpBytesWritten = ctx.Get<size_t*>("MEM_DUMP_BYTE_WRITTEN");
	}
	std::reference_wrapper<size_t> memDumpBytesWritten = std::ref(*pMemDumpBytesWritten);
	auto& profiler = ctx.Get<Profiler&>("profiler");

	/* Get model reference. */
	auto& model = ctx.Get<RNNoiseModel&>("model");
	if (!model.IsInited()) {
	printf_err("Model is not initialised! Terminating processing.\n");
	return false;
	}

	/* Populate Pre-Processing related parameters. */
	auto audioFrameLen = ctx.Get<uint32_t>("frameLength");
	auto audioFrameStride = ctx.Get<uint32_t>("frameStride");
	auto nrNumInputFeatures = ctx.Get<uint32_t>("numInputFeatures");

	TfLiteTensor* inputTensor = model.GetInputTensor(0);
	if (nrNumInputFeatures != inputTensor->bytes) {
	printf_err("Input features size must be equal to input tensor size."
	" Feature size = %" PRIu32 ", Tensor size = %zu.\n",
	nrNumInputFeatures, inputTensor->bytes);
	return false;
	}

	TfLiteTensor* outputTensor = model.GetOutputTensor(model.m_indexForModelOutput);

	/* Initial choice of index for WAV file. */
	auto startClipIdx = ctx.Get<uint32_t>("clipIndex");

	std::function<const int16_t* (const uint32_t)> audioAccessorFunc = get_audio_array;
	if (ctx.Has("features")) {
	audioAccessorFunc = ctx.Get<std::function<const int16_t* (const uint32_t)>>("features");
	}
	std::function<uint32_t (const uint32_t)> audioSizeAccessorFunc = get_audio_array_size;
	if (ctx.Has("featureSizes")) {
	audioSizeAccessorFunc = ctx.Get<std::function<uint32_t (const uint32_t)>>("featureSizes");
	}
	std::function<const char*(const uint32_t)> audioFileAccessorFunc = get_filename;
	if (ctx.Has("featureFileNames")) {
	audioFileAccessorFunc = ctx.Get<std::function<const char*(const uint32_t)>>("featureFileNames");
	}
	do {
	hal_lcd_clear(COLOR_BLACK);

	auto startDumpAddress = memDumpBaseAddr + memDumpBytesWritten;
	auto currentIndex = ctx.Get<uint32_t>("clipIndex");

	/* Creating a sliding window through the audio. */
	auto audioDataSlider = audio::SlidingWindow<const int16_t>(
	audioAccessorFunc(currentIndex),
	audioSizeAccessorFunc(currentIndex), audioFrameLen,
	audioFrameStride);

	info("Running inference on input feature map %" PRIu32 " => %s\n", currentIndex,
	audioFileAccessorFunc(currentIndex));

	memDumpBytesWritten += DumpDenoisedAudioHeader(audioFileAccessorFunc(currentIndex),
	(audioDataSlider.TotalStrides() + 1) * audioFrameLen,
	memDumpBaseAddr + memDumpBytesWritten,
	memDumpMaxLen - memDumpBytesWritten);

	/* Set up pre and post-processing. */
	std::shared_ptr<rnn::RNNoiseFeatureProcessor> featureProcessor =
	std::make_shared<rnn::RNNoiseFeatureProcessor>();
	std::shared_ptr<rnn::FrameFeatures> frameFeatures =
	std::make_shared<rnn::FrameFeatures>();

	RNNoisePreProcess preProcess = RNNoisePreProcess(inputTensor, featureProcessor, frameFeatures);

	std::vector<int16_t> denoisedAudioFrame(audioFrameLen);
	RNNoisePostProcess postProcess = RNNoisePostProcess(outputTensor, denoisedAudioFrame,
	featureProcessor, frameFeatures);

	bool resetGRU = true;

	while (audioDataSlider.HasNext()) {
	const int16_t* inferenceWindow = audioDataSlider.Next();

	if (!preProcess.DoPreProcess(inferenceWindow, audioFrameLen)) {
	printf_err("Pre-processing failed.");
	return false;
	}

	/* Reset or copy over GRU states first to avoid TFLu memory overlap issues. */
	if (resetGRU){
	model.ResetGruState();
	} else {
	/* Copying gru state outputs to gru state inputs.
	* Call ResetGruState in between the sequence of inferences on unrelated input data. */
	model.CopyGruStates();
	}

	/* Strings for presentation/logging. */
	std::string str_inf{"Running inference... "};

	/* Display message on the LCD - inference running. */
	hal_lcd_display_text(str_inf.c_str(), str_inf.size(),
	dataPsnTxtInfStartX, dataPsnTxtInfStartY, false);

	info("Inference %zu/%zu\n", audioDataSlider.Index() + 1, audioDataSlider.TotalStrides() + 1);

	/* Run inference over this feature sliding window. */
	if (!RunInference(model, profiler)) {
	printf_err("Inference failed.");
	return false;
	}
	resetGRU = false;

	/* Carry out post-processing. */
	if (!postProcess.DoPostProcess()) {
	printf_err("Post-processing failed.");
	return false;
	}

	/* Erase. */
	str_inf = std::string(str_inf.size(), ' ');
	hal_lcd_display_text(str_inf.c_str(), str_inf.size(),
	dataPsnTxtInfStartX, dataPsnTxtInfStartY, false);

	if (memDumpMaxLen > 0) {
	/* Dump final post processed output to memory. */
	memDumpBytesWritten += DumpOutputDenoisedAudioFrame(
	denoisedAudioFrame,
	memDumpBaseAddr + memDumpBytesWritten,
	memDumpMaxLen - memDumpBytesWritten);
	}
	}

	if (memDumpMaxLen > 0) {
	/* Needed to not let the compiler complain about type mismatch. */
	size_t valMemDumpBytesWritten = memDumpBytesWritten;
	info("Output memory dump of %zu bytes written at address 0x%p\n",
	valMemDumpBytesWritten, startDumpAddress);
	}

	/* Finish by dumping the footer. */
	DumpDenoisedAudioFooter(memDumpBaseAddr + memDumpBytesWritten, memDumpMaxLen - memDumpBytesWritten);

	info("All inferences for audio clip complete.\n");
	profiler.PrintProfilingResult();
	IncrementAppCtxClipIdx(ctx);

	std::string clearString{' '};
	hal_lcd_display_text(clearString.c_str(), clearString.size(),
	dataPsnTxtInfStartX, dataPsnTxtInfStartY, false);

	std::string completeMsg{"Inference complete!"};

	/* Display message on the LCD - inference complete. */
	hal_lcd_display_text(completeMsg.c_str(), completeMsg.size(),
	dataPsnTxtInfStartX, dataPsnTxtInfStartY, false);

	} while (runAll && ctx.Get<uint32_t>("clipIndex") != startClipIdx);

	return true;
	}

	size_t DumpDenoisedAudioHeader(const char* filename, size_t dumpSize,
	uint8_t* memAddress, size_t memSize){

	if (memAddress == nullptr){
	return 0;
	}

	int32_t filenameLength = strlen(filename);
	size_t numBytesWritten = 0;
	size_t numBytesToWrite = 0;
	int32_t dumpSizeByte = dumpSize * sizeof(int16_t);
	bool overflow = false;

	/* Write the filename length */
	numBytesToWrite = sizeof(filenameLength);
	if (memSize - numBytesToWrite > 0) {
	std::memcpy(memAddress, &filenameLength, numBytesToWrite);
	numBytesWritten += numBytesToWrite;
	memSize -= numBytesWritten;
	} else {
	overflow = true;
	}

	/* Write file name */
	numBytesToWrite = filenameLength;
	if(memSize - numBytesToWrite > 0) {
	std::memcpy(memAddress + numBytesWritten, filename, numBytesToWrite);
	numBytesWritten += numBytesToWrite;
	memSize -= numBytesWritten;
	} else {
	overflow = true;
	}

	/* Write dumpSize in byte */
	numBytesToWrite = sizeof(dumpSizeByte);
	if(memSize - numBytesToWrite > 0) {
	std::memcpy(memAddress + numBytesWritten, &(dumpSizeByte), numBytesToWrite);
	numBytesWritten += numBytesToWrite;
	memSize -= numBytesWritten;
	} else {
	overflow = true;
	}

	if(false == overflow) {
	info("Audio Clip dump header info (%zu bytes) written to %p\n", numBytesWritten, memAddress);
	} else {
	printf_err("Not enough memory to dump Audio Clip header.\n");
	}

	return numBytesWritten;
	}

	size_t DumpDenoisedAudioFooter(uint8_t* memAddress, size_t memSize){
	if ((memAddress == nullptr) \|\| (memSize < 4)) {
	return 0;
	}
	const int32_t eofMarker = -1;
	std::memcpy(memAddress, &eofMarker, sizeof(int32_t));

	return sizeof(int32_t);
	}

	size_t DumpOutputDenoisedAudioFrame(const std::vector<int16_t>& audioFrame,
	uint8_t* memAddress, size_t memSize)
	{
	if (memAddress == nullptr) {
	return 0;
	}

	size_t numByteToBeWritten = audioFrame.size() * sizeof(int16_t);
	if( numByteToBeWritten > memSize) {
	printf_err("Overflow error: Writing %zu of %zu bytes to memory @ 0x%p.\n", memSize, numByteToBeWritten, memAddress);
	numByteToBeWritten = memSize;
	}

	std::memcpy(memAddress, audioFrame.data(), numByteToBeWritten);
	info("Copied %zu bytes to %p\n", numByteToBeWritten, memAddress);

	return numByteToBeWritten;
	}

	size_t DumpOutputTensorsToMemory(Model& model, uint8_t* memAddress, const size_t memSize)
	{
	const size_t numOutputs = model.GetNumOutputs();
	size_t numBytesWritten = 0;
	uint8_t* ptr = memAddress;

	/* Iterate over all output tensors. */
	for (size_t i = 0; i < numOutputs; ++i) {
	const TfLiteTensor* tensor = model.GetOutputTensor(i);
	const auto* tData = tflite::GetTensorData<uint8_t>(tensor);
	#if VERIFY_TEST_OUTPUT
	DumpTensor(tensor);
	#endif /* VERIFY_TEST_OUTPUT */
	/* Ensure that we don't overflow the allowed limit. */
	if (numBytesWritten + tensor->bytes <= memSize) {
	if (tensor->bytes > 0) {
	std::memcpy(ptr, tData, tensor->bytes);

	info("Copied %zu bytes for tensor %zu to 0x%p\n",
	tensor->bytes, i, ptr);

	numBytesWritten += tensor->bytes;
	ptr += tensor->bytes;
	}
	} else {
	printf_err("Error writing tensor %zu to memory @ 0x%p\n",
	i, memAddress);
	break;
	}
	}

	info("%zu bytes written to memory @ 0x%p\n", numBytesWritten, memAddress);

	return numBytesWritten;
	}

	static void IncrementAppCtxClipIdx(ApplicationContext& ctx)
	{
	auto curClipIdx = ctx.Get<uint32_t>("clipIndex");
	if (curClipIdx + 1 >= NUMBER_OF_FILES) {
	ctx.Set<uint32_t>("clipIndex", 0);
	return;
	}
	++curClipIdx;
	ctx.Set<uint32_t>("clipIndex", curClipIdx);
	}

	} /* namespace app */
	} /* namespace arm */