Jack2 1.9.8

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(jack_default_audio_sample_t) * fRingBufferSize);
00030     jack_ringbuffer_read_advance(fRingBuffer, (sizeof(jack_default_audio_sample_t) * fRingBufferSize) / 2);
00031 }
00032 
00033 JackResampler::~JackResampler()
00034 {
00035     if (fRingBuffer) {
00036         jack_ringbuffer_free(fRingBuffer);
00037     }
00038 }
00039 
00040 void JackResampler::Reset(unsigned int new_size)
00041 {
00042     fRingBufferSize = new_size;
00043     jack_ringbuffer_reset(fRingBuffer);
00044     jack_ringbuffer_reset_size(fRingBuffer, sizeof(jack_default_audio_sample_t) * fRingBufferSize);
00045     jack_ringbuffer_read_advance(fRingBuffer, (sizeof(jack_default_audio_sample_t) * fRingBufferSize / 2));
00046 }
00047 
00048 unsigned int JackResampler::ReadSpace()
00049 {
00050     return (jack_ringbuffer_read_space(fRingBuffer) / sizeof(jack_default_audio_sample_t));
00051 }
00052 
00053 unsigned int JackResampler::WriteSpace()
00054 {
00055     return (jack_ringbuffer_write_space(fRingBuffer) / sizeof(jack_default_audio_sample_t));
00056 }
00057 
00058 unsigned int JackResampler::Read(jack_default_audio_sample_t* buffer, unsigned int frames)
00059 {
00060     size_t len = jack_ringbuffer_read_space(fRingBuffer);
00061     jack_log("JackResampler::Read input available = %ld", len / sizeof(jack_default_audio_sample_t));
00062 
00063     if (len < frames * sizeof(jack_default_audio_sample_t)) {
00064         jack_error("JackResampler::Read : producer too slow, missing frames = %d", frames);
00065         return 0;
00066     } else {
00067         jack_ringbuffer_read(fRingBuffer, (char*)buffer, frames * sizeof(jack_default_audio_sample_t));
00068         return frames;
00069     }
00070 }
00071 
00072 unsigned int JackResampler::Write(jack_default_audio_sample_t* buffer, unsigned int frames)
00073 {
00074     size_t len = jack_ringbuffer_write_space(fRingBuffer);
00075     jack_log("JackResampler::Write output available = %ld", len / sizeof(jack_default_audio_sample_t));
00076 
00077     if (len < frames * sizeof(jack_default_audio_sample_t)) {
00078         jack_error("JackResampler::Write : consumer too slow, skip frames = %d", frames);
00079         return 0;
00080     } else {
00081         jack_ringbuffer_write(fRingBuffer, (char*)buffer, frames * sizeof(jack_default_audio_sample_t));
00082         return frames;
00083     }
00084 }
00085 
00086 unsigned int JackResampler::Read(void* buffer, unsigned int bytes)
00087 {
00088     size_t len = jack_ringbuffer_read_space(fRingBuffer);
00089     jack_log("JackResampler::Read input available = %ld", len);
00090 
00091     if (len < bytes) {
00092         jack_error("JackResampler::Read : producer too slow, missing bytes = %d", bytes);
00093         return 0;
00094     } else {
00095         jack_ringbuffer_read(fRingBuffer, (char*)buffer, bytes);
00096         return bytes;
00097     }
00098 }
00099 
00100 unsigned int JackResampler::Write(void* buffer, unsigned int bytes)
00101 {
00102     size_t len = jack_ringbuffer_write_space(fRingBuffer);
00103     jack_log("JackResampler::Write output available = %ld", len);
00104 
00105     if (len < bytes) {
00106         jack_error("JackResampler::Write : consumer too slow, skip bytes = %d", bytes);
00107         return 0;
00108     } else {
00109         jack_ringbuffer_write(fRingBuffer, (char*)buffer, bytes);
00110         return bytes;
00111     }
00112 }
00113 
00114 unsigned int JackResampler::ReadResample(jack_default_audio_sample_t* buffer, unsigned int frames)
00115 {
00116     return Read(buffer, frames);
00117 }
00118 
00119 unsigned int JackResampler::WriteResample(jack_default_audio_sample_t* buffer, unsigned int frames)
00120 {
00121     return Write(buffer, frames);
00122 }
00123 
00124 }