106 lines
3.8 KiB
C
106 lines
3.8 KiB
C
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/**
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* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0.
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*/
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#pragma once
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#include <aws/text-to-speech/TextToSpeech_EXPORTS.h>
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#include <aws/core/utils/Array.h>
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#include <aws/core/utils/memory/stl/AWSString.h>
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#include <aws/core/utils/memory/stl/AWSVector.h>
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namespace Aws
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{
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namespace TextToSpeech
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{
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static const unsigned BIT_WIDTH_16 = 16;
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static const unsigned MONO = 1;
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static const size_t KHZ_22_5 = 22050;
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static const size_t KHZ_16 = 16000;
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static const size_t KHZ_8 = 8000;
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struct CapabilityInfo
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{
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CapabilityInfo() : channels(MONO), sampleRate(KHZ_16), sampleWidthBits(BIT_WIDTH_16) {}
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unsigned channels;
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size_t sampleRate;
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unsigned sampleWidthBits;
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};
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struct DeviceInfo
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{
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Aws::String deviceName;
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Aws::String deviceId;
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Aws::Vector<CapabilityInfo> capabilities;
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};
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/**
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* Abstract class for configuring and sending linear pcm data to a sound card.
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*/
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class AWS_TEXT_TO_SPEECH_API PCMOutputDriver
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{
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public:
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virtual ~PCMOutputDriver();
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/**
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* Write a buffer of audio data to a device. The format of this data will be set in the SetActiveDevice function.
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* returns true if audio was successfully written to the device, false otherwise.
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*/
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virtual bool WriteBufferToDevice(const unsigned char*, size_t) = 0;
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/**
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* Enumerate all devices and their capabilities. The device id and the capability will be returned to you
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* when a user calls SetActiveDevice();
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*/
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virtual Aws::Vector<DeviceInfo> EnumerateDevices() const = 0;
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/**
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* Set the device and format that this driver should use. After this call, you should expect all calls to WriteBufferToDevice()
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* to be for the specified device and format.
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*/
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virtual void SetActiveDevice(const DeviceInfo&, const CapabilityInfo&) = 0;
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/**
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* Get a friendly name for this driver.
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*/
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virtual const char* GetName() const = 0;
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/**
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* Not used for most implementations. Some operating systems however, expect a constant stream of data to the device.
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* Since playing will be batchy, Prime() will be called before each new batch of audio data. This is the chance to reset
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* the device so it can play the audio.
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*/
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virtual void Prime() {};
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/**
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* Not used for most implementations. Some operating systems however, expect a constant stream of data to the device.
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* Since playing will be batchy, Flush will be called after each batch of audio so that you can pause or reset the audio device.
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*/
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virtual void Flush() {};
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};
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/**
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* Abstract factory for returning implementations of output drivers to the application. Provide an implementation of this
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* if you want to override operating system defaults.
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*/
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class AWS_TEXT_TO_SPEECH_API PCMOutputDriverFactory
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{
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public:
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virtual ~PCMOutputDriverFactory() = default;
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/**
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* Return a list of drivers that you want supported for the application.
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*/
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virtual Aws::Vector<std::shared_ptr<PCMOutputDriver>> LoadDrivers() const = 0;
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};
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/**
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* Returns a default factory. This factory handles operating system defaults:
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* Windows - WaveOut
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* Linux - PulseAudio
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* Apple - CoreAudio
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*/
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AWS_TEXT_TO_SPEECH_API std::shared_ptr<PCMOutputDriverFactory> DefaultPCMOutputDriverFactoryInitFn();
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}
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}
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