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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2008 Laurent Gomila (laurent.gom@gmail.com)
//
// 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/OpenAL.hpp>
#include <SFML/System/Sleep.hpp>
#include <iostream>
////////////////////////////////////////////////////////////
// Private data
////////////////////////////////////////////////////////////
namespace
{
ALCdevice* CaptureDevice = NULL;
}
namespace sf
{
////////////////////////////////////////////////////////////
/// Default constructor
////////////////////////////////////////////////////////////
SoundRecorder::SoundRecorder() :
mySampleRate (0),
myIsCapturing(false)
{
}
////////////////////////////////////////////////////////////
/// Virtual destructor
////////////////////////////////////////////////////////////
SoundRecorder::~SoundRecorder()
{
// Nothing to do
}
////////////////////////////////////////////////////////////
/// Start the capture.
/// Warning : only one capture can happen at the same time
////////////////////////////////////////////////////////////
void SoundRecorder::Start(unsigned int SampleRate)
{
// Check if the device can do audio capture
if (!CanCapture())
{
std::cerr << "Failed to start capture : your system cannot capture audio data (call SoundRecorder::CanCapture to check it)" << std::endl;
return;
}
// Check that another capture is not already running
if (CaptureDevice)
{
std::cerr << "Trying to start audio capture, but another capture is already running" << std::endl;
return;
}
// Open the capture device for capturing 16 bits mono samples
CaptureDevice = alcCaptureOpenDevice(NULL, SampleRate, AL_FORMAT_MONO16, SampleRate);
if (!CaptureDevice)
{
std::cerr << "Failed to open the audio capture device" << std::endl;
return;
}
// Clear the sample array
mySamples.clear();
// Store the sample rate
mySampleRate = SampleRate;
// Notify derived class
if (OnStart())
{
// Start the capture
alcCaptureStart(CaptureDevice);
// Start the capture in a new thread, to avoid blocking the main thread
myIsCapturing = true;
Launch();
}
}
////////////////////////////////////////////////////////////
/// Stop the capture
////////////////////////////////////////////////////////////
void SoundRecorder::Stop()
{
// Stop the capturing thread
myIsCapturing = false;
Wait();
}
////////////////////////////////////////////////////////////
/// Get the sample rate
////////////////////////////////////////////////////////////
unsigned int SoundRecorder::GetSampleRate() const
{
return mySampleRate;
}
////////////////////////////////////////////////////////////
/// Tell if the system supports sound capture.
/// If not, this class won't be usable
////////////////////////////////////////////////////////////
bool SoundRecorder::CanCapture()
{
ALCdevice* Device = priv::AudioDevice::GetInstance().GetDevice();
return alcIsExtensionPresent(Device, "ALC_EXT_CAPTURE") != AL_FALSE;
}
////////////////////////////////////////////////////////////
/// Start recording audio data
////////////////////////////////////////////////////////////
bool SoundRecorder::OnStart()
{
// Nothing to do
return true;
}
////////////////////////////////////////////////////////////
/// Stop recording audio data
////////////////////////////////////////////////////////////
void SoundRecorder::OnStop()
{
// Nothing to do
}
////////////////////////////////////////////////////////////
/// /see Thread::Run
////////////////////////////////////////////////////////////
void SoundRecorder::Run()
{
while (myIsCapturing)
{
// Process available samples
ProcessCapturedSamples();
// Don't bother the CPU while waiting for more captured data
Sleep(0.1f);
}
// Capture is finished : clean up everything
CleanUp();
// Notify derived class
OnStop();
}
////////////////////////////////////////////////////////////
/// Get available captured samples and process them
////////////////////////////////////////////////////////////
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
mySamples.resize(SamplesAvailable);
alcCaptureSamples(CaptureDevice, &mySamples[0], SamplesAvailable);
// Forward them to the derived class
if (!OnProcessSamples(&mySamples[0], mySamples.size()))
{
// The user wants to stop the capture
myIsCapturing = false;
}
}
}
////////////////////////////////////////////////////////////
/// Clean up recorder internal resources
////////////////////////////////////////////////////////////
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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