1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/*
Copyright (C) 2007 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "pbd/error.h"
#include "ardour/resampled_source.h"
#include "pbd/failed_constructor.h"
#include "pbd/i18n.h"
using namespace ARDOUR;
using namespace PBD;
#ifdef PLATFORM_WINDOWS
const uint32_t ResampledImportableSource::blocksize = 524288U;
#else
const uint32_t ResampledImportableSource::blocksize = 16384U;
#endif
ResampledImportableSource::ResampledImportableSource (boost::shared_ptr<ImportableSource> src, framecnt_t rate, SrcQuality srcq)
: source (src)
, _src_state (0)
{
_src_type = SRC_SINC_BEST_QUALITY;
switch (srcq) {
case SrcBest:
_src_type = SRC_SINC_BEST_QUALITY;
break;
case SrcGood:
_src_type = SRC_SINC_MEDIUM_QUALITY;
break;
case SrcQuick:
_src_type = SRC_SINC_FASTEST;
break;
case SrcFast:
_src_type = SRC_ZERO_ORDER_HOLD;
break;
case SrcFastest:
_src_type = SRC_LINEAR;
break;
}
_input = new float[blocksize];
seek (0);
_src_data.src_ratio = ((float) rate) / source->samplerate();
}
ResampledImportableSource::~ResampledImportableSource ()
{
_src_state = src_delete (_src_state) ;
delete [] _input;
}
framecnt_t
ResampledImportableSource::read (Sample* output, framecnt_t nframes)
{
int err;
size_t bs = floor ((float)(blocksize / source->channels())) * source->channels();
/* If the input buffer is empty, refill it. */
if (_src_data.input_frames == 0) {
_src_data.input_frames = source->read (_input, bs);
/* The last read will not be a full buffer, so set end_of_input. */
if ((size_t) _src_data.input_frames < bs) {
_end_of_input = true;
}
_src_data.input_frames /= source->channels();
_src_data.data_in = _input;
}
_src_data.data_out = output;
_src_data.output_frames = nframes / source->channels();
if (_end_of_input && _src_data.input_frames * _src_data.src_ratio <= _src_data.output_frames) {
/* only set src_data.end_of_input for the last cycle.
*
* The flag only affects writing out remaining data in the
* internal buffer of src_state.
* SRC is not aware of data bufered here in _src_data.input
* which needs to be processed first.
*/
_src_data.end_of_input = true;
}
if ((err = src_process (_src_state, &_src_data))) {
error << string_compose(_("Import: %1"), src_strerror (err)) << endmsg ;
return 0 ;
}
/* Terminate if at end */
if (_src_data.end_of_input && _src_data.output_frames_gen == 0) {
return 0;
}
_src_data.data_in += _src_data.input_frames_used * source->channels();
_src_data.input_frames -= _src_data.input_frames_used ;
return _src_data.output_frames_gen * source->channels();
}
void
ResampledImportableSource::seek (framepos_t pos)
{
source->seek (pos);
/* and reset things so that we start from scratch with the conversion */
if (_src_state) {
src_delete (_src_state);
}
int err;
if ((_src_state = src_new (_src_type, source->channels(), &err)) == 0) {
error << string_compose(_("Import: src_new() failed : %1"), src_strerror (err)) << endmsg ;
throw failed_constructor ();
}
_src_data.input_frames = 0;
_src_data.data_in = _input;
_src_data.end_of_input = 0;
_end_of_input = false;
}
framepos_t
ResampledImportableSource::natural_position () const
{
return source->natural_position() * ratio ();
}
|
