Jack2 1.9.10
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00001 /* 00002 Copyright (C) 2008 Grame 00003 00004 This program is free software; you can redistribute it and/or modify 00005 it under the terms of the GNU General Public License as published by 00006 the Free Software Foundation; either version 2 of the License, or 00007 (at your option) any later version. 00008 00009 This program is distributed in the hope that it will be useful, 00010 but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00012 GNU General Public License for more details. 00013 00014 You should have received a copy of the GNU General Public License 00015 along with this program; if not, write to the Free Software 00016 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00017 00018 */ 00019 00020 #ifndef __JackResampler__ 00021 #define __JackResampler__ 00022 00023 #include "ringbuffer.h" 00024 #include "types.h" 00025 00026 namespace Jack 00027 { 00028 00029 #define DEFAULT_RB_SIZE 32768 00030 #define DEFAULT_ADAPTATIVE_SIZE 2048 00031 00032 inline float Range(float min, float max, float val) 00033 { 00034 return (val < min) ? min : ((val > max) ? max : val); 00035 } 00036 00041 class JackRingBuffer 00042 { 00043 00044 protected: 00045 00046 jack_ringbuffer_t* fRingBuffer; 00047 unsigned int fRingBufferSize; 00048 00049 public: 00050 00051 JackRingBuffer(int size = DEFAULT_RB_SIZE); 00052 virtual ~JackRingBuffer(); 00053 00054 virtual void Reset(unsigned int new_size); 00055 00056 // in frames 00057 virtual unsigned int Read(jack_default_audio_sample_t* buffer, unsigned int frames); 00058 virtual unsigned int Write(jack_default_audio_sample_t* buffer, unsigned int frames); 00059 00060 // in bytes 00061 virtual unsigned int Read(void* buffer, unsigned int bytes); 00062 virtual unsigned int Write(void* buffer, unsigned int bytes); 00063 00064 // in frames 00065 virtual unsigned int ReadSpace(); 00066 virtual unsigned int WriteSpace(); 00067 00068 unsigned int GetError() 00069 { 00070 return (jack_ringbuffer_read_space(fRingBuffer) / sizeof(float)) - (fRingBufferSize / 2); 00071 } 00072 00073 }; 00074 00079 class JackResampler : public JackRingBuffer 00080 { 00081 00082 protected: 00083 00084 double fRatio; 00085 00086 public: 00087 00088 JackResampler():JackRingBuffer(),fRatio(1) 00089 {} 00090 virtual ~JackResampler() 00091 {} 00092 00093 virtual unsigned int ReadResample(jack_default_audio_sample_t* buffer, unsigned int frames); 00094 virtual unsigned int WriteResample(jack_default_audio_sample_t* buffer, unsigned int frames); 00095 00096 void SetRatio(double ratio) 00097 { 00098 fRatio = Range(0.25, 4.0, ratio); 00099 } 00100 00101 double GetRatio() 00102 { 00103 return fRatio; 00104 } 00105 00106 }; 00107 } 00108 00109 #endif