107 lines
3.0 KiB
C++
107 lines
3.0 KiB
C++
// Copyright (C) 2002-2007 Nikolaus Gebhardt
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// Part of the code for this plugin for irrKlang is based on:
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// MP3 input for Audiere by Matt Campbell <mattcampbell@pobox.com>, based on
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// libavcodec from ffmpeg (http://ffmpeg.sourceforge.net/).
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// See license.txt for license details of this plugin.
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#ifndef __C_IRRKLANG_AUDIO_STREAM_MP3_H_INCLUDED__
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#define __C_IRRKLANG_AUDIO_STREAM_MP3_H_INCLUDED__
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#include <ik_IAudioStream.h>
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#include <ik_IFileReader.h>
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#include <vector>
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#include "decoder/mpaudec.h"
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namespace irrklang
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{
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const int IKP_MP3_INPUT_BUFFER_SIZE = 4096;
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//! Reads and decodes audio data into an usable audio stream for the ISoundEngine
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/** To extend irrKlang with new audio format decoders, the only thing needed to do
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is implementing the IAudioStream interface. All the code available in this class is only for
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mp3 decoding and may make this class look a bit more complicated then it actually is. */
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class CIrrKlangAudioStreamMP3 : public IAudioStream
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{
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public:
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CIrrKlangAudioStreamMP3(IFileReader* file);
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~CIrrKlangAudioStreamMP3();
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//! returns format of the audio stream
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virtual SAudioStreamFormat getFormat();
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//! tells the audio stream to read n audio frames into the specified buffer
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/** \param target: Target data buffer to the method will write the read frames into. The
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specified buffer will be getFormat().getFrameSize()*frameCount big.
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\param frameCount: amount of frames to be read.
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\returns Returns amount of frames really read. Should be frameCountToRead in most cases. */
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virtual ik_s32 readFrames(void* target, ik_s32 frameCountToRead);
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//! sets the position of the audio stream.
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/** For example to let the stream be read from the beginning of the file again,
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setPosition(0) would be called. This is usually done be the sound engine to
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loop a stream after if has reached the end. Return true if sucessful and 0 if not. */
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virtual bool setPosition(ik_s32 pos);
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// just for the CIrrKlangAudioStreamLoaderMP3 to let him know if loading worked
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bool isOK() { return File != 0; }
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protected:
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ik_s32 readFrameForMP3(void* target, ik_s32 frameCountToRead, bool parseOnly=false);
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bool decodeFrame();
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void skipID3IfNecessary();
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irrklang::IFileReader* File;
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SAudioStreamFormat Format;
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// mpaudec specific
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MPAuDecContext* TheMPAuDecContext;
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ik_u8 InputBuffer[IKP_MP3_INPUT_BUFFER_SIZE];
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int InputPosition;
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int InputLength;
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int Position;
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ik_u8* DecodeBuffer;
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ik_s32 FileBegin;
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ik_u32 CurrentFramePosition;
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bool FirstFrameRead;
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bool EndOfFileReached;
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// helper class for managing the streaming decoded audio data
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class QueueBuffer
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{
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public:
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QueueBuffer();
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~QueueBuffer();
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int getSize();
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void write(const void* buffer, int size);
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int read(void* buffer, int size);
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void clear();
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private:
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ik_u8* Buffer;
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int Capacity;
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int Size;
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};
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struct SFramePositionData
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{
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int offset;
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int size;
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};
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std::vector<SFramePositionData> FramePositionData;
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QueueBuffer DecodedQueue;
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};
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} // end namespace irrklang
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#endif
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