Initial commit

engines/mtropolis/audio_player.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "mtropolis/audio_player.h"
+#include "mtropolis/assets.h"
+
+namespace MTropolis {
+
+AudioPlayer::AudioPlayer(Audio::Mixer *mixer, byte volume, int8 balance, const Common::SharedPtr<AudioMetadata> &metadata, const Common::SharedPtr<CachedAudio> &audio, bool isLooping, size_t currentPos, size_t startPos, size_t endPos)
+	: _metadata(metadata), _audio(audio), _isLooping(isLooping), _currentPos(currentPos), _startPos(startPos), _endPos(endPos), _exhausted(false), _mixer(nullptr) {
+	if (_startPos >= _endPos) {
+		// ???
+		_exhausted = true;
+		_isLooping = false;
+	}
+	if (_currentPos < _startPos)
+		_currentPos = _startPos;
+
+	if (!_exhausted) {
+		_mixer = mixer;
+		mixer->playStream(Audio::Mixer::kPlainSoundType, &_handle, this, -1, volume, balance, DisposeAfterUse::NO);
+	}
+}
+
+AudioPlayer::~AudioPlayer() {
+	stop();
+}
+
+int AudioPlayer::readBuffer(int16 *buffer, const int numSamplesTimesChannelCount) {
+	Common::StackLock lock(_mutex);
+
+	int samplesRead = 0;
+	if (_exhausted)
+		return 0;
+
+	uint8 numChannels = _metadata->channels;
+
+	size_t numSamples = numSamplesTimesChannelCount / numChannels;
+
+	while (numSamples > 0) {
+		size_t samplesAvailable = _endPos - _currentPos;
+		if (samplesAvailable == 0) {
+			if (_isLooping) {
+				_currentPos = _startPos;
+				continue;
+			} else {
+				_exhausted = true;
+				break;
+			}
+		}
+
+		size_t numSamplesThisIteration = numSamples;
+		if (numSamplesThisIteration > samplesAvailable)
+			numSamplesThisIteration = samplesAvailable;
+
+		size_t numSampleValues = numSamplesThisIteration * numChannels;
+		// TODO: Support more formats
+		if (_metadata->bitsPerSample == 8 && _metadata->encoding == AudioMetadata::kEncodingUncompressed) {
+			const uint8 *inSamples = static_cast<const uint8 *>(_audio->getData()) + _currentPos * numChannels;
+			for (size_t i = 0; i < numSampleValues; i++)
+				buffer[i] = (inSamples[i] - 0x80) * 256;
+		} else if (_metadata->bitsPerSample == 16 && _metadata->encoding == AudioMetadata::kEncodingUncompressed) {
+			const int16 *inSamples = static_cast<const int16 *>(_audio->getData()) + _currentPos * numChannels;
+			memcpy(buffer, inSamples, sizeof(int16) * numSampleValues);
+		}
+
+		buffer += numSampleValues;
+		numSamples -= numSamplesThisIteration;
+
+		samplesRead += numSamplesThisIteration * numChannels;
+		_currentPos += numSamplesThisIteration;
+	}
+
+	return samplesRead;
+}
+
+bool AudioPlayer::isStereo() const {
+	return _metadata->channels == 2;
+}
+
+int AudioPlayer::getRate() const {
+	return _metadata->sampleRate;
+}
+
+bool AudioPlayer::endOfData() const {
+	return _exhausted;
+}
+
+void AudioPlayer::sendToMixer(Audio::Mixer *mixer, byte volume, int8 balance) {
+	mixer->playStream(Audio::Mixer::kPlainSoundType, &_handle, this, -1, volume, balance, DisposeAfterUse::NO);
+}
+
+void AudioPlayer::stop() {
+	if (_mixer)
+		_mixer->stopHandle(_handle);
+
+	_exhausted = true;
+	_mixer = nullptr;
+}
+
+} // End of namespace MTropolis