Mercurial > hg > svcore
view data/fileio/MP3FileReader.h @ 1591:6e68bd92ee21 bqaudiostream
Add flac metadata example
author | Chris Cannam |
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date | Mon, 21 Jan 2019 11:45:51 +0000 |
parents | 48e9f538e6e9 |
children | c01cbe41aeb5 |
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ /* Sonic Visualiser An audio file viewer and annotation editor. Centre for Digital Music, Queen Mary, University of London. This file copyright 2006 Chris Cannam. 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 2 of the License, or (at your option) any later version. See the file COPYING included with this distribution for more information. */ #ifndef _MP3_FILE_READER_H_ #define _MP3_FILE_READER_H_ #ifdef HAVE_MAD #include "CodedAudioFileReader.h" #include "base/Thread.h" #include <mad.h> #include <set> class ProgressReporter; class MP3FileReader : public CodedAudioFileReader { Q_OBJECT public: /** * How the MP3FileReader should handle leading and trailing gaps. * See http://lame.sourceforge.net/tech-FAQ.txt for a technical * explanation of the numbers here. */ enum class GaplessMode { /** * Trim unwanted samples from the start and end of the decoded * audio. From the start, trim a number of samples equal to * the decoder delay (a fixed 529 samples) plus any encoder * delay that may be specified in Xing/LAME metadata. From the * end, trim any padding specified in Xing/LAME metadata, less * the fixed decoder delay. This usually results in "gapless" * audio, i.e. with no spurious zero padding at either end. */ Gapless, /** * Do not trim any samples. Also do not suppress any frames * from being passed to the mp3 decoder, even Xing/LAME * metadata frames. This will result in the audio being padded * with zeros at either end: at the start, typically * 529+576+1152 = 2257 samples for LAME-encoded mp3s; at the * end an unknown number depending on the fill ratio of the * final coded frame, but typically less than 1152-529 = 623. * * This mode produces the same output as produced by older * versions of this code before the gapless option was added, * and is present mostly for backward compatibility. */ Gappy }; MP3FileReader(FileSource source, DecodeMode decodeMode, CacheMode cacheMode, GaplessMode gaplessMode, sv_samplerate_t targetRate = 0, bool normalised = false, ProgressReporter *reporter = 0); virtual ~MP3FileReader(); virtual QString getError() const { return m_error; } virtual QString getLocation() const { return m_source.getLocation(); } virtual QString getTitle() const { return m_title; } virtual QString getMaker() const { return m_maker; } virtual TagMap getTags() const { return m_tags; } static void getSupportedExtensions(std::set<QString> &extensions); static bool supportsExtension(QString ext); static bool supportsContentType(QString type); static bool supports(FileSource &source); virtual int getDecodeCompletion() const { return m_completion; } virtual bool isUpdating() const { return m_decodeThread && m_decodeThread->isRunning(); } public slots: void cancelled(); protected: FileSource m_source; QString m_path; QString m_error; QString m_title; QString m_maker; TagMap m_tags; GaplessMode m_gaplessMode; sv_frame_t m_fileSize; double m_bitrateNum; int m_bitrateDenom; int m_mp3FrameCount; int m_completion; bool m_done; unsigned char *m_fileBuffer; size_t m_fileBufferSize; float **m_sampleBuffer; size_t m_sampleBufferSize; ProgressReporter *m_reporter; bool m_cancelled; bool m_decodeErrorShown; struct DecoderData { unsigned char const *start; sv_frame_t length; bool finished; MP3FileReader *reader; }; bool decode(void *mm, sv_frame_t sz); enum mad_flow filter(struct mad_stream const *, struct mad_frame *); enum mad_flow accept(struct mad_header const *, struct mad_pcm *); static enum mad_flow input_callback(void *, struct mad_stream *); static enum mad_flow output_callback(void *, struct mad_header const *, struct mad_pcm *); static enum mad_flow filter_callback(void *, struct mad_stream const *, struct mad_frame *); static enum mad_flow error_callback(void *, struct mad_stream *, struct mad_frame *); class DecodeThread : public Thread { public: DecodeThread(MP3FileReader *reader) : m_reader(reader) { } virtual void run(); protected: MP3FileReader *m_reader; }; DecodeThread *m_decodeThread; void loadTags(int fd); QString loadTag(void *vtag, const char *name); }; #endif #endif