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https://github.com/libretro/scummvm.git
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131 lines
3.9 KiB
C++
131 lines
3.9 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "audio/decoders/aac.h"
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#ifdef USE_FAAD
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#include "common/debug.h"
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#include "common/memstream.h"
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#include "common/stream.h"
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#include "common/textconsole.h"
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#include "common/util.h"
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#include "audio/audiostream.h"
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#include "audio/decoders/codec.h"
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#include "audio/decoders/raw.h"
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#include <neaacdec.h>
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namespace Audio {
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class AACDecoder : public Codec {
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public:
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AACDecoder(Common::SeekableReadStream *extraData,
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DisposeAfterUse::Flag disposeExtraData);
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~AACDecoder();
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AudioStream *decodeFrame(Common::SeekableReadStream &stream);
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private:
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NeAACDecHandle _handle;
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byte _channels;
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unsigned long _rate;
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};
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AACDecoder::AACDecoder(Common::SeekableReadStream *extraData, DisposeAfterUse::Flag disposeExtraData) {
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// Open the library
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_handle = NeAACDecOpen();
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// Configure the library to our needs
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NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(_handle);
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conf->outputFormat = FAAD_FMT_16BIT; // We only support 16bit audio
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conf->downMatrix = 1; // Convert from 5.1 to stereo if required
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NeAACDecSetConfiguration(_handle, conf);
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// Copy the extra data to a buffer
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extraData->seek(0);
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byte *extraDataBuf = new byte[extraData->size()];
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extraData->read(extraDataBuf, extraData->size());
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// Initialize with our extra data
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// NOTE: This code assumes the extra data is coming from an MPEG-4 file!
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int err = NeAACDecInit2(_handle, extraDataBuf, extraData->size(), &_rate, &_channels);
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delete[] extraDataBuf;
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if (err < 0)
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error("Could not initialize AAC decoder: %s", NeAACDecGetErrorMessage(err));
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if (disposeExtraData == DisposeAfterUse::YES)
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delete extraData;
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}
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AACDecoder::~AACDecoder() {
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NeAACDecClose(_handle);
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}
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AudioStream *AACDecoder::decodeFrame(Common::SeekableReadStream &stream) {
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// read everything into a buffer
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uint32 inBufferPos = 0;
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uint32 inBufferSize = stream.size();
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byte *inBuffer = new byte[inBufferSize];
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stream.read(inBuffer, inBufferSize);
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QueuingAudioStream *audioStream = makeQueuingAudioStream(_rate, _channels == 2);
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// Decode until we have enough samples (or there's no more left)
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while (inBufferPos < inBufferSize) {
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NeAACDecFrameInfo frameInfo;
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void *decodedSamples = NeAACDecDecode(_handle, &frameInfo, inBuffer + inBufferPos, inBufferSize - inBufferPos);
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if (frameInfo.error != 0)
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error("Failed to decode AAC frame: %s", NeAACDecGetErrorMessage(frameInfo.error));
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byte *buffer = (byte *)malloc(frameInfo.samples * 2);
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memcpy(buffer, decodedSamples, frameInfo.samples * 2);
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byte flags = FLAG_16BITS;
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if (_channels == 2)
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flags |= FLAG_STEREO;
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#ifdef SCUMM_LITTLE_ENDIAN
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flags |= FLAG_LITTLE_ENDIAN;
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#endif
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audioStream->queueBuffer(buffer, frameInfo.samples * 2, DisposeAfterUse::YES, flags);
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inBufferPos += frameInfo.bytesconsumed;
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}
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return audioStream;
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}
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// Factory function
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Codec *makeAACDecoder(Common::SeekableReadStream *extraData, DisposeAfterUse::Flag disposeExtraData) {
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return new AACDecoder(extraData, disposeExtraData);
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}
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} // End of namespace Audio
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#endif // #ifdef USE_FAAD
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