common/JackResampler.cpp

   1 /*
   2 Copyright (C) 2008 Grame
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation; either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include "JackResampler.h"
  21
  22 namespace Jack
  23 {
  24
  25 JackResampler::JackResampler():fNum(1),fDenom(1)
  26 {
  27     fRingBuffer = jack_ringbuffer_create(sizeof(float) * DEFAULT_RB_SIZE);
  28     jack_ringbuffer_read_advance(fRingBuffer, (sizeof(float) * DEFAULT_RB_SIZE) / 2);
  29 }
  30
  31 JackResampler::~JackResampler()
  32 {
  33     if (fRingBuffer)
  34         jack_ringbuffer_free(fRingBuffer);
  35 }
  36
  37 void JackResampler::Reset()
  38 {
  39     jack_ringbuffer_read_advance(fRingBuffer, (sizeof(float) * DEFAULT_RB_SIZE) / 2);
  40 }
  41
  42 unsigned int JackResampler::ReadSpace()
  43 {
  44     return (jack_ringbuffer_read_space(fRingBuffer) / sizeof(float));
  45 }
  46
  47 unsigned int JackResampler::WriteSpace()
  48 {
  49     return (jack_ringbuffer_write_space(fRingBuffer) / sizeof(float));
  50 }
  51
  52 unsigned int JackResampler::Read(float* buffer, unsigned int frames)
  53 {
  54     size_t len = jack_ringbuffer_read_space(fRingBuffer);
  55     jack_log("JackResampler::Read input available = %ld", len / sizeof(float));
  56
  57     if (len < frames * sizeof(float)) {
  58         jack_error("JackResampler::Read : producer too slow, missing frames = %d", frames);
  59         return 0;
  60     } else {
  61         jack_ringbuffer_read(fRingBuffer, (char*)buffer, frames * sizeof(float));
  62         return frames;
  63     }
  64 }
  65
  66 unsigned int JackResampler::Write(float* buffer, unsigned int frames)
  67 {
  68     size_t len = jack_ringbuffer_write_space(fRingBuffer);
  69     jack_log("JackResampler::Write output available = %ld", len / sizeof(float));
  70
  71     if (len < frames * sizeof(float)) {
  72         jack_error("JackResampler::Write : consumer too slow, skip frames = %d", frames);
  73         return 0;
  74     } else {
  75         jack_ringbuffer_write(fRingBuffer, (char*)buffer, frames * sizeof(float));
  76         return frames;
  77     }
  78 }
  79
  80 unsigned int JackResampler::ReadResample(float* buffer, unsigned int frames)
  81 {
  82     return Read(buffer, frames);
  83 }
  84
  85 unsigned int JackResampler::WriteResample(float* buffer, unsigned int frames)
  86 {
  87     return Write(buffer, frames);
  88 }
  89
  90 }