Initial commit

engines/mediastation/audio.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 "audio/decoders/adpcm.h"
+#include "audio/decoders/raw.h"
+
+#include "mediastation/audio.h"
+#include "mediastation/debugchannels.h"
+#include "mediastation/mediastation.h"
+
+namespace MediaStation {
+
+AudioSequence::~AudioSequence() {
+	g_engine->_mixer->stopHandle(_handle);
+
+	for (Audio::SeekableAudioStream *stream : _streams) {
+		delete stream;
+	}
+	_streams.clear();
+}
+
+void AudioSequence::play() {
+	_handle = Audio::SoundHandle();
+	if (!_streams.empty()) {
+		Audio::QueuingAudioStream *audio = Audio::makeQueuingAudioStream(22050, false);
+		for (Audio::SeekableAudioStream *stream : _streams) {
+			stream->rewind();
+			audio->queueAudioStream(stream, DisposeAfterUse::NO);
+		}
+		g_engine->_mixer->playStream(Audio::Mixer::kPlainSoundType, &_handle, audio, -1, Audio::Mixer::kMaxChannelVolume, DisposeAfterUse::YES);
+		audio->finish();
+	}
+}
+
+void AudioSequence::stop() {
+	g_engine->_mixer->stopHandle(_handle);
+	_handle = Audio::SoundHandle();
+}
+
+void AudioSequence::readParameters(Chunk &chunk) {
+	_chunkCount = chunk.readTypedUint16();
+	_rate = chunk.readTypedUint32();
+	_channelCount = chunk.readTypedUint16();
+	_bitsPerSample = chunk.readTypedUint16();
+}
+
+void AudioSequence::readChunk(Chunk &chunk) {
+	Common::SeekableReadStream *buffer = chunk.readStream(chunk._length);
+	Audio::SeekableAudioStream *stream = nullptr;
+	switch (_bitsPerSample) {
+	case 16:
+		stream = Audio::makeRawStream(buffer, _rate, Audio::FLAG_16BITS | Audio::FLAG_LITTLE_ENDIAN);
+		break;
+
+	case 4: // IMA ADPCM-encoded, raw nibbles (no headers).
+		stream = Audio::makeADPCMStream(buffer, DisposeAfterUse::YES, 0, Audio::kADPCMDVI, _rate, 1, 8);
+		break;
+
+	default:
+		error("%s: Unknown audio encoding 0x%x", __func__, static_cast<uint>(_bitsPerSample));
+	}
+	_streams.push_back(stream);
+	debugC(5, kDebugLoading, "Finished reading audio chunk (@0x%llx)", static_cast<long long int>(chunk.pos()));
+}
+
+bool AudioSequence::isActive() {
+	return g_engine->_mixer->isSoundHandleActive(_handle);
+}
+
+} // End of namespace MediaStation