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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2023 Laurent Gomila (laurent@sfml-dev.org)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Audio/SoundRecorder.hpp>
#include <SFML/Audio/AudioDevice.hpp>
#include <SFML/Audio/ALCheck.hpp>
#include <SFML/System/Sleep.hpp>
#include <SFML/System/Err.hpp>
#include <cstring>
#include <cassert>
#ifdef _MSC_VER
#pragma warning(disable: 4355) // 'this' used in base member initializer list
#endif
#if defined(__APPLE__)
#if defined(__clang__)
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
#elif defined(__GNUC__)
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif
#endif
namespace
{
ALCdevice* captureDevice = NULL;
}
namespace sf
{
////////////////////////////////////////////////////////////
SoundRecorder::SoundRecorder() :
m_thread (&SoundRecorder::record, this),
m_sampleRate (0),
m_processingInterval(milliseconds(100)),
m_isCapturing (false),
m_deviceName (getDefaultDevice()),
m_channelCount (1)
{
}
////////////////////////////////////////////////////////////
SoundRecorder::~SoundRecorder()
{
// This assertion is triggered if the recording is still running while
// the object is destroyed. It ensures that stop() is called in the
// destructor of the derived class, which makes sure that the recording
// thread finishes before the derived object is destroyed. Otherwise a
// "pure virtual method called" exception is triggered.
assert(!m_isCapturing && "You must call stop() in the destructor of your derived class, so that the recording thread finishes before your object is destroyed.");
}
////////////////////////////////////////////////////////////
bool SoundRecorder::start(unsigned int sampleRate)
{
// Check if the device can do audio capture
if (!isAvailable())
{
err() << "Failed to start capture: your system cannot capture audio data (call SoundRecorder::isAvailable to check it)" << std::endl;
return false;
}
// Check that another capture is not already running
if (captureDevice)
{
err() << "Trying to start audio capture, but another capture is already running" << std::endl;
return false;
}
// Determine the recording format
ALCenum format = (m_channelCount == 1) ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16;
// Open the capture device for capturing 16 bits samples
captureDevice = alcCaptureOpenDevice(m_deviceName.c_str(), sampleRate, format, static_cast<ALCsizei>(sampleRate));
if (!captureDevice)
{
err() << "Failed to open the audio capture device with the name: " << m_deviceName << std::endl;
return false;
}
// Clear the array of samples
m_samples.clear();
// Store the sample rate
m_sampleRate = sampleRate;
// Notify derived class
if (onStart())
{
// Start the capture
alcCaptureStart(captureDevice);
// Start the capture in a new thread, to avoid blocking the main thread
m_isCapturing = true;
m_thread.launch();
return true;
}
return false;
}
////////////////////////////////////////////////////////////
void SoundRecorder::stop()
{
// Stop the capturing thread if there is one
if (m_isCapturing)
{
m_isCapturing = false;
m_thread.wait();
// Notify derived class
onStop();
}
}
////////////////////////////////////////////////////////////
unsigned int SoundRecorder::getSampleRate() const
{
return m_sampleRate;
}
////////////////////////////////////////////////////////////
std::vector<std::string> SoundRecorder::getAvailableDevices()
{
std::vector<std::string> deviceNameList;
const ALchar* deviceList = alcGetString(NULL, ALC_CAPTURE_DEVICE_SPECIFIER);
if (deviceList)
{
while (*deviceList)
{
deviceNameList.push_back(deviceList);
deviceList += std::strlen(deviceList) + 1;
}
}
return deviceNameList;
}
////////////////////////////////////////////////////////////
std::string SoundRecorder::getDefaultDevice()
{
return alcGetString(NULL, ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER);
}
////////////////////////////////////////////////////////////
bool SoundRecorder::setDevice(const std::string& name)
{
// Store the device name
if (name.empty())
m_deviceName = getDefaultDevice();
else
m_deviceName = name;
if (m_isCapturing)
{
// Stop the capturing thread
m_isCapturing = false;
m_thread.wait();
// Determine the recording format
ALCenum format = (m_channelCount == 1) ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16;
// Open the requested capture device for capturing 16 bits samples
captureDevice = alcCaptureOpenDevice(m_deviceName.c_str(), m_sampleRate, format, static_cast<ALCsizei>(m_sampleRate));
if (!captureDevice)
{
// Notify derived class
onStop();
err() << "Failed to open the audio capture device with the name: " << m_deviceName << std::endl;
return false;
}
// Start the capture
alcCaptureStart(captureDevice);
// Start the capture in a new thread, to avoid blocking the main thread
m_isCapturing = true;
m_thread.launch();
}
return true;
}
////////////////////////////////////////////////////////////
const std::string& SoundRecorder::getDevice() const
{
return m_deviceName;
}
////////////////////////////////////////////////////////////
void SoundRecorder::setChannelCount(unsigned int channelCount)
{
if (m_isCapturing)
{
err() << "It's not possible to change the channels while recording." << std::endl;
return;
}
if (channelCount < 1 || channelCount > 2)
{
err() << "Unsupported channel count: " << channelCount << " Currently only mono (1) and stereo (2) recording is supported." << std::endl;
return;
}
m_channelCount = channelCount;
}
////////////////////////////////////////////////////////////
unsigned int SoundRecorder::getChannelCount() const
{
return m_channelCount;
}
////////////////////////////////////////////////////////////
bool SoundRecorder::isAvailable()
{
return (priv::AudioDevice::isExtensionSupported("ALC_EXT_CAPTURE") != AL_FALSE) ||
(priv::AudioDevice::isExtensionSupported("ALC_EXT_capture") != AL_FALSE); // "bug" in Mac OS X 10.5 and 10.6
}
////////////////////////////////////////////////////////////
void SoundRecorder::setProcessingInterval(Time interval)
{
m_processingInterval = interval;
}
////////////////////////////////////////////////////////////
bool SoundRecorder::onStart()
{
// Nothing to do
return true;
}
////////////////////////////////////////////////////////////
void SoundRecorder::onStop()
{
// Nothing to do
}
////////////////////////////////////////////////////////////
void SoundRecorder::record()
{
while (m_isCapturing)
{
// Process available samples
processCapturedSamples();
// Don't bother the CPU while waiting for more captured data
sleep(m_processingInterval);
}
// Capture is finished: clean up everything
cleanup();
}
////////////////////////////////////////////////////////////
void SoundRecorder::processCapturedSamples()
{
// Get the number of samples available
ALCint samplesAvailable;
alcGetIntegerv(captureDevice, ALC_CAPTURE_SAMPLES, 1, &samplesAvailable);
if (samplesAvailable > 0)
{
// Get the recorded samples
m_samples.resize(static_cast<unsigned int>(samplesAvailable) * getChannelCount());
alcCaptureSamples(captureDevice, &m_samples[0], samplesAvailable);
// Forward them to the derived class
if (!onProcessSamples(&m_samples[0], m_samples.size()))
{
// The user wants to stop the capture
m_isCapturing = false;
}
}
}
////////////////////////////////////////////////////////////
void SoundRecorder::cleanup()
{
// Stop the capture
alcCaptureStop(captureDevice);
// Get the samples left in the buffer
processCapturedSamples();
// Close the device
alcCaptureCloseDevice(captureDevice);
captureDevice = NULL;
}
} // namespace sf
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