Jack2 1.9.6

JackResampler.cpp

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 #include "JackResampler.h"
00021 #include <stdio.h>
00022 
00023 namespace Jack
00024 {
00025 
00026 JackResampler::JackResampler()
00027     :fRatio(1),fRingBufferSize(DEFAULT_RB_SIZE)
00028 {
00029     fRingBuffer = jack_ringbuffer_create(sizeof(float) * fRingBufferSize);
00030     jack_ringbuffer_read_advance(fRingBuffer, (sizeof(float) * fRingBufferSize) / 2);
00031 }
00032 
00033 JackResampler::~JackResampler()
00034 {
00035     if (fRingBuffer)
00036         jack_ringbuffer_free(fRingBuffer);
00037 }
00038 
00039 void JackResampler::Reset(unsigned int new_size)
00040 {
00041     fRingBufferSize = new_size;
00042     jack_ringbuffer_reset_size(fRingBuffer, sizeof(float) * fRingBufferSize);
00043     jack_ringbuffer_read_advance(fRingBuffer, (sizeof(float) * fRingBufferSize / 2));
00044 }
00045 
00046 unsigned int JackResampler::ReadSpace()
00047 {
00048     return (jack_ringbuffer_read_space(fRingBuffer) / sizeof(float));
00049 }
00050 
00051 unsigned int JackResampler::WriteSpace()
00052 {
00053     return (jack_ringbuffer_write_space(fRingBuffer) / sizeof(float));
00054 }
00055 
00056 unsigned int JackResampler::Read(float* buffer, unsigned int frames)
00057 {
00058     size_t len = jack_ringbuffer_read_space(fRingBuffer);
00059     jack_log("JackResampler::Read input available = %ld", len / sizeof(float));
00060         
00061     if (len < frames * sizeof(float)) {
00062         jack_error("JackResampler::Read : producer too slow, missing frames = %d", frames);
00063         return 0;
00064     } else {
00065         jack_ringbuffer_read(fRingBuffer, (char*)buffer, frames * sizeof(float));
00066         return frames;
00067     }
00068 }
00069 
00070 unsigned int JackResampler::Write(float* buffer, unsigned int frames)
00071 {
00072     size_t len = jack_ringbuffer_write_space(fRingBuffer);
00073     jack_log("JackResampler::Write output available = %ld", len / sizeof(float));
00074         
00075     if (len < frames * sizeof(float)) {
00076         jack_error("JackResampler::Write : consumer too slow, skip frames = %d", frames);
00077         return 0;
00078     } else {
00079         jack_ringbuffer_write(fRingBuffer, (char*)buffer, frames * sizeof(float));
00080         return frames;
00081     }
00082 }
00083 
00084 unsigned int JackResampler::ReadResample(float* buffer, unsigned int frames)
00085 {
00086     return Read(buffer, frames);
00087 }
00088 
00089 unsigned int JackResampler::WriteResample(float* buffer, unsigned int frames)
00090 {
00091     return Write(buffer, frames);
00092 }
00093 
00094 }