58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
/*
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AudioGeneratorMP3
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Audio output generator using the Helix MP3 decoder
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Copyright (C) 2017 Earle F. Philhower, III
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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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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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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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#ifndef _AUDIOGENERATORMP3A_H
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#define _AUDIOGENERATORMP3A_H
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#include "AudioGenerator.h"
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#include "libhelix-mp3/mp3dec.h"
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class AudioGeneratorMP3a : public AudioGenerator
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{
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public:
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AudioGeneratorMP3a();
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virtual ~AudioGeneratorMP3a() override;
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virtual bool begin(AudioFileSource *source, AudioOutput *output) override;
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virtual bool loop() override;
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virtual bool stop() override;
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virtual bool isRunning() override;
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protected:
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// Helix MP3 decoder
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HMP3Decoder hMP3Decoder;
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// Input buffering
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uint8_t buff[1600]; // File buffer required to store at least a whole compressed frame
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int16_t buffValid;
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int16_t lastFrameEnd;
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bool FillBufferWithValidFrame(); // Read until we get a valid syncword and min(feof, 2048) butes in the buffer
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// Output buffering
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int16_t outSample[1152 * 2]; // Interleaved L/R
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int16_t validSamples;
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int16_t curSample;
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// Each frame may change this if they're very strange, I guess
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unsigned int lastRate;
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int lastChannels;
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};
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#endif
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