Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/plugins/openal/OpenALReader.cpp

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+/*******************************************************************************
+ * Copyright 2009-2016 Jörg Müller
+ *
+ * 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 "OpenALReader.h"
+#include "respec/ConverterFunctions.h"
+#include "Exception.h"
+
+#include <algorithm>
+#include <al.h>
+#include <cstdint>
+#include <cstring>
+#include <vector>
+
+AUD_NAMESPACE_BEGIN
+
+OpenALReader::OpenALReader(Specs specs, int buffersize, const std::string& name) :
+	m_specs(specs),
+	m_position(0),
+	m_device(nullptr)
+{
+	if((specs.channels != CHANNELS_MONO) && (specs.channels != CHANNELS_STEREO))
+		specs.channels = CHANNELS_MONO;
+	m_specs.channels = specs.channels;
+
+	const char* device_name = name.empty() ? nullptr : name.c_str();
+	m_device = alcCaptureOpenDevice(device_name, specs.rate,
+									specs.channels == CHANNELS_MONO ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16,
+									buffersize * specs.channels * 2);
+
+	if(!m_device)
+		AUD_THROW(DeviceException, "The capture device couldn't be opened with OpenAL.");
+
+	alcCaptureStart(m_device);
+}
+
+OpenALReader::~OpenALReader()
+{
+	if(m_device)
+	{
+		alcCaptureStop(m_device);
+		alcCaptureCloseDevice(m_device);
+	}
+}
+
+std::vector<std::string> OpenALReader::getDeviceNames()
+{
+	std::vector<std::string> names;
+
+	/* ALC_CAPTURE_DEVICE_SPECIFIER requires ALC_ENUMERATION_EXT.
+	* Without it alcGetString may return garbage on some drivers. */
+	if(!alcIsExtensionPresent(nullptr, "ALC_ENUMERATION_EXT"))
+		return names;
+
+	const ALCchar* devices = alcGetString(nullptr, ALC_CAPTURE_DEVICE_SPECIFIER);
+	if(devices != nullptr)
+	{
+		const ALCchar* cursor = devices;
+		while(*cursor != '\0')
+		{
+			names.push_back(cursor);
+			cursor += std::strlen(cursor) + 1;
+		}
+	}
+
+	const ALCchar* default_device = alcGetString(nullptr, ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER);
+	if(default_device != nullptr && default_device[0] != '\0')
+	{
+		const std::string default_name(default_device);
+		auto it = std::find(names.begin(), names.end(), default_name);
+		if(it == names.end())
+			names.insert(names.begin(), default_name);
+		else if(it != names.begin())
+		{
+			names.erase(it);
+			names.insert(names.begin(), default_name);
+		}
+	}
+
+	return names;
+}
+
+bool OpenALReader::isSeekable() const
+{
+	return false;
+}
+
+void OpenALReader::seek(int position)
+{
+	m_position = position;
+}
+
+int OpenALReader::getLength() const
+{
+	int length;
+	alcGetIntegerv(m_device, ALC_CAPTURE_SAMPLES, 1, &length);
+	return length;
+}
+
+int OpenALReader::getPosition() const
+{
+	return m_position;
+}
+
+Specs OpenALReader::getSpecs() const
+{
+	return m_specs;
+}
+
+void OpenALReader::read(int & length, bool& eos, sample_t* buffer)
+{
+	int len = getLength();
+	length = std::min(length, len);
+
+	if(length > 0)
+	{
+		alcCaptureSamples(m_device, buffer, length);
+		convert_s16_float((data_t*)buffer, (data_t*)buffer, length * m_specs.channels);
+	}
+
+	eos = false;
+
+	m_position += length;
+}
+
+AUD_NAMESPACE_END