107 lines
3.1 KiB
C++
107 lines
3.1 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef FLAC_DECODER_H_
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#define FLAC_DECODER_H_
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#include <media/stagefright/foundation/ABase.h>
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#include <utils/RefBase.h>
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#include <utils/String8.h>
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#include "FLAC/stream_decoder.h"
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namespace android {
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// packet based FLAC decoder, wrapps libFLAC stream decoder.
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class FLACDecoder {
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public:
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enum {
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kMaxChannels = 8,
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};
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static FLACDecoder *Create();
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FLAC__StreamMetadata_StreamInfo getStreamInfo() const {
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return mStreamInfo;
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}
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status_t parseMetadata(const uint8_t *inBuffer, size_t inBufferLen);
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status_t decodeOneFrame(const uint8_t *inBuffer, size_t inBufferLen,
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void *outBuffer, size_t *outBufferLen, bool outputFloat = false);
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void flush();
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virtual ~FLACDecoder();
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protected:
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FLACDecoder();
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private:
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// stream properties
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unsigned getMaxBlockSize() const {
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return mStreamInfo.max_blocksize;
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}
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unsigned getSampleRate() const {
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return mStreamInfo.sample_rate;
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}
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unsigned getChannels() const {
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return mStreamInfo.channels;
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}
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unsigned getBitsPerSample() const {
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return mStreamInfo.bits_per_sample;
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}
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FLAC__uint64 getTotalSamples() const {
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return mStreamInfo.total_samples;
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}
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status_t addDataToBuffer(const uint8_t *inBuffer, size_t inBufferLen);
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FLAC__StreamDecoder *mDecoder;
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uint8_t *mBuffer; // cache input bit stream data
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size_t mBufferLen; // the memory size of |mBuffer|
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size_t mBufferPos; // next byte to read in |mBuffer|
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// size of input data stored in |mBuffer|, always started at offset 0
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size_t mBufferDataSize;
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// cached when the STREAMINFO metadata is parsed by libFLAC
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FLAC__StreamMetadata_StreamInfo mStreamInfo;
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bool mStreamInfoValid;
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// cached when a decoded PCM block is "written" by libFLAC decoder
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bool mWriteRequested;
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bool mWriteCompleted;
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FLAC__FrameHeader mWriteHeader;
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FLAC__int32 const * mWriteBuffer[kMaxChannels];
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// most recent error reported by libFLAC decoder
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FLAC__StreamDecoderErrorStatus mErrorStatus;
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status_t init();
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// FLAC stream decoder callbacks as C++ instance methods
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FLAC__StreamDecoderReadStatus readCallback(FLAC__byte buffer[], size_t *bytes);
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FLAC__StreamDecoderWriteStatus writeCallback(
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const FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
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void metadataCallback(const FLAC__StreamMetadata *metadata);
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void errorCallback(FLAC__StreamDecoderErrorStatus status);
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DISALLOW_EVIL_CONSTRUCTORS(FLACDecoder);
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};
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} // namespace android
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#endif // FLAC_DECODER_H_
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