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audio/decoders/aac.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/aac.h"
+
+#ifdef USE_FAAD
+
+#include "common/debug.h"
+#include "common/memstream.h"
+#include "common/stream.h"
+#include "common/textconsole.h"
+#include "common/util.h"
+
+#include "audio/audiostream.h"
+#include "audio/decoders/codec.h"
+#include "audio/decoders/raw.h"
+
+#include <neaacdec.h>
+
+namespace Audio {
+
+class AACDecoder : public Codec {
+public:
+	AACDecoder(Common::SeekableReadStream *extraData,
+	          DisposeAfterUse::Flag disposeExtraData);
+	~AACDecoder();
+
+	AudioStream *decodeFrame(Common::SeekableReadStream &stream) override;
+
+private:
+	NeAACDecHandle _handle;
+	byte _channels;
+	unsigned long _rate;
+};
+
+AACDecoder::AACDecoder(Common::SeekableReadStream *extraData, DisposeAfterUse::Flag disposeExtraData) {
+	// Open the library
+	_handle = NeAACDecOpen();
+
+	// Configure the library to our needs
+	NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(_handle);
+	conf->outputFormat = FAAD_FMT_16BIT; // We only support 16bit audio
+	conf->downMatrix = 1;                // Convert from 5.1 to stereo if required
+	NeAACDecSetConfiguration(_handle, conf);
+
+	// Copy the extra data to a buffer
+	extraData->seek(0);
+	byte *extraDataBuf = new byte[extraData->size()];
+	extraData->read(extraDataBuf, extraData->size());
+
+	// Initialize with our extra data
+	// NOTE: This code assumes the extra data is coming from an MPEG-4 file!
+	int err = NeAACDecInit2(_handle, extraDataBuf, extraData->size(), &_rate, &_channels);
+	delete[] extraDataBuf;
+
+	if (err < 0)
+		error("Could not initialize AAC decoder: %s", NeAACDecGetErrorMessage(err));
+
+	if (disposeExtraData == DisposeAfterUse::YES)
+		delete extraData;
+}
+
+AACDecoder::~AACDecoder() {
+	NeAACDecClose(_handle);
+}
+
+AudioStream *AACDecoder::decodeFrame(Common::SeekableReadStream &stream) {
+	// read everything into a buffer
+	uint32 inBufferPos = 0;
+	uint32 inBufferSize = stream.size();
+	byte *inBuffer = new byte[inBufferSize];
+	stream.read(inBuffer, inBufferSize);
+
+	QueuingAudioStream *audioStream = makeQueuingAudioStream(_rate, _channels == 2);
+
+	// Decode until we have enough samples (or there's no more left)
+	while (inBufferPos < inBufferSize) {
+		NeAACDecFrameInfo frameInfo;
+		void *decodedSamples = NeAACDecDecode(_handle, &frameInfo, inBuffer + inBufferPos, inBufferSize - inBufferPos);
+
+		if (frameInfo.error != 0)
+			error("Failed to decode AAC frame: %s", NeAACDecGetErrorMessage(frameInfo.error));
+
+		byte *buffer = (byte *)malloc(frameInfo.samples * 2);
+		memcpy(buffer, decodedSamples, frameInfo.samples * 2);
+
+		byte flags = FLAG_16BITS;
+
+		if (_channels == 2)
+			flags |= FLAG_STEREO;
+
+#ifdef SCUMM_LITTLE_ENDIAN
+		flags |= FLAG_LITTLE_ENDIAN;
+#endif
+
+		audioStream->queueBuffer(buffer, frameInfo.samples * 2, DisposeAfterUse::YES, flags);
+
+		inBufferPos += frameInfo.bytesconsumed;
+	}
+
+	audioStream->finish();
+	return audioStream;
+}
+
+// Factory function
+Codec *makeAACDecoder(Common::SeekableReadStream *extraData, DisposeAfterUse::Flag disposeExtraData) {
+	return new AACDecoder(extraData, disposeExtraData);
+}
+
+} // End of namespace Audio
+
+#endif // #ifdef USE_FAAD