Jack2  1.9.12
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 #include "JackError.h"
22 #include <stdio.h>
23 
24 namespace Jack
25 {
26 
27 JackRingBuffer::JackRingBuffer(int size):fRingBufferSize(size)
28 {
29  fRingBuffer = jack_ringbuffer_create(sizeof(jack_default_audio_sample_t) * fRingBufferSize);
30  Reset(fRingBufferSize);
31 }
32 
33 JackRingBuffer::~JackRingBuffer()
34 {
35  if (fRingBuffer) {
36  jack_ringbuffer_free(fRingBuffer);
37  }
38 }
39 
40 void JackRingBuffer::Reset(unsigned int new_size)
41 {
42  fRingBufferSize = new_size;
43  jack_ringbuffer_reset(fRingBuffer);
44  jack_ringbuffer_reset_size(fRingBuffer, sizeof(jack_default_audio_sample_t) * fRingBufferSize);
45  jack_ringbuffer_read_advance(fRingBuffer, (sizeof(jack_default_audio_sample_t) * new_size/2));
46 }
47 
48 unsigned int JackRingBuffer::ReadSpace()
49 {
50  return (jack_ringbuffer_read_space(fRingBuffer) / sizeof(jack_default_audio_sample_t));
51 }
52 
53 unsigned int JackRingBuffer::WriteSpace()
54 {
55  return (jack_ringbuffer_write_space(fRingBuffer) / sizeof(jack_default_audio_sample_t));
56 }
57 
58 unsigned int JackRingBuffer::Read(jack_default_audio_sample_t* buffer, unsigned int frames)
59 {
60  size_t len = jack_ringbuffer_read_space(fRingBuffer);
61  jack_log("JackRingBuffer::Read input available = %ld", len / sizeof(jack_default_audio_sample_t));
62 
63  if (len < frames * sizeof(jack_default_audio_sample_t)) {
64  jack_error("JackRingBuffer::Read : producer too slow, missing frames = %d", frames);
65  return 0;
66  } else {
67  jack_ringbuffer_read(fRingBuffer, (char*)buffer, frames * sizeof(jack_default_audio_sample_t));
68  return frames;
69  }
70 }
71 
72 unsigned int JackRingBuffer::Write(jack_default_audio_sample_t* buffer, unsigned int frames)
73 {
74  size_t len = jack_ringbuffer_write_space(fRingBuffer);
75  jack_log("JackRingBuffer::Write output available = %ld", len / sizeof(jack_default_audio_sample_t));
76 
77  if (len < frames * sizeof(jack_default_audio_sample_t)) {
78  jack_error("JackRingBuffer::Write : consumer too slow, skip frames = %d", frames);
79  return 0;
80  } else {
81  jack_ringbuffer_write(fRingBuffer, (char*)buffer, frames * sizeof(jack_default_audio_sample_t));
82  return frames;
83  }
84 }
85 
86 unsigned int JackRingBuffer::Read(void* buffer, unsigned int bytes)
87 {
88  size_t len = jack_ringbuffer_read_space(fRingBuffer);
89  jack_log("JackRingBuffer::Read input available = %ld", len);
90 
91  if (len < bytes) {
92  jack_error("JackRingBuffer::Read : producer too slow, missing bytes = %d", bytes);
93  return 0;
94  } else {
95  jack_ringbuffer_read(fRingBuffer, (char*)buffer, bytes);
96  return bytes;
97  }
98 }
99 
100 unsigned int JackRingBuffer::Write(void* buffer, unsigned int bytes)
101 {
102  size_t len = jack_ringbuffer_write_space(fRingBuffer);
103  jack_log("JackRingBuffer::Write output available = %ld", len);
104 
105  if (len < bytes) {
106  jack_error("JackRingBuffer::Write : consumer too slow, skip bytes = %d", bytes);
107  return 0;
108  } else {
109  jack_ringbuffer_write(fRingBuffer, (char*)buffer, bytes);
110  return bytes;
111  }
112 }
113 
114 unsigned int JackResampler::ReadResample(jack_default_audio_sample_t* buffer, unsigned int frames)
115 {
116  return Read(buffer, frames);
117 }
118 
119 unsigned int JackResampler::WriteResample(jack_default_audio_sample_t* buffer, unsigned int frames)
120 {
121  return Write(buffer, frames);
122 }
123 
124 }