139 lines
3.4 KiB
C++
139 lines
3.4 KiB
C++
/*******************************************************************************
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* Copyright 2009-2016 Jörg Müller
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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******************************************************************************/
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#include "OpenALReader.h"
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#include "respec/ConverterFunctions.h"
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#include "Exception.h"
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#include <algorithm>
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#include <al.h>
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#include <cstdint>
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#include <cstring>
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#include <vector>
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AUD_NAMESPACE_BEGIN
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OpenALReader::OpenALReader(Specs specs, int buffersize, const std::string& name) :
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m_specs(specs),
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m_position(0),
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m_device(nullptr)
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{
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if((specs.channels != CHANNELS_MONO) && (specs.channels != CHANNELS_STEREO))
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specs.channels = CHANNELS_MONO;
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m_specs.channels = specs.channels;
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const char* device_name = name.empty() ? nullptr : name.c_str();
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m_device = alcCaptureOpenDevice(device_name, specs.rate,
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specs.channels == CHANNELS_MONO ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16,
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buffersize * specs.channels * 2);
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if(!m_device)
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AUD_THROW(DeviceException, "The capture device couldn't be opened with OpenAL.");
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alcCaptureStart(m_device);
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}
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OpenALReader::~OpenALReader()
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{
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if(m_device)
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{
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alcCaptureStop(m_device);
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alcCaptureCloseDevice(m_device);
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}
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}
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std::vector<std::string> OpenALReader::getDeviceNames()
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{
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std::vector<std::string> names;
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/* ALC_CAPTURE_DEVICE_SPECIFIER requires ALC_ENUMERATION_EXT.
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* Without it alcGetString may return garbage on some drivers. */
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if(!alcIsExtensionPresent(nullptr, "ALC_ENUMERATION_EXT"))
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return names;
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const ALCchar* devices = alcGetString(nullptr, ALC_CAPTURE_DEVICE_SPECIFIER);
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if(devices != nullptr)
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{
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const ALCchar* cursor = devices;
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while(*cursor != '\0')
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{
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names.push_back(cursor);
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cursor += std::strlen(cursor) + 1;
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}
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}
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const ALCchar* default_device = alcGetString(nullptr, ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER);
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if(default_device != nullptr && default_device[0] != '\0')
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{
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const std::string default_name(default_device);
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auto it = std::find(names.begin(), names.end(), default_name);
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if(it == names.end())
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names.insert(names.begin(), default_name);
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else if(it != names.begin())
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{
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names.erase(it);
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names.insert(names.begin(), default_name);
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}
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}
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return names;
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}
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bool OpenALReader::isSeekable() const
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{
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return false;
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}
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void OpenALReader::seek(int position)
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{
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m_position = position;
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}
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int OpenALReader::getLength() const
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{
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int length;
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alcGetIntegerv(m_device, ALC_CAPTURE_SAMPLES, 1, &length);
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return length;
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}
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int OpenALReader::getPosition() const
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{
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return m_position;
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}
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Specs OpenALReader::getSpecs() const
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{
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return m_specs;
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}
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void OpenALReader::read(int & length, bool& eos, sample_t* buffer)
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{
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int len = getLength();
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length = std::min(length, len);
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if(length > 0)
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{
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alcCaptureSamples(m_device, buffer, length);
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convert_s16_float((data_t*)buffer, (data_t*)buffer, length * m_specs.channels);
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}
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eos = false;
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m_position += length;
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}
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AUD_NAMESPACE_END
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