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