2 Copyright (C) 2014 Paul Davis
3 Written by: Robin Gareus <robin@gareus.org>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include "pbd/error.h"
22 #include "pbd/failed_constructor.h"
24 #include "ardour/audiofilesource.h"
25 #include "ardour/debug.h"
26 #include "ardour/srcfilesource.h"
30 using namespace ARDOUR;
33 /* see disk_io_chunk_frames */
34 const uint32_t SrcFileSource::blocksize = 65536U;
36 SrcFileSource::SrcFileSource (Session& s, boost::shared_ptr<AudioFileSource> src, SrcQuality srcq)
37 : Source(s, DataType::AUDIO, src->name(), Flag (src->flags() & ~(Writable|Removable|RemovableIfEmpty|RemoveAtDestroy)))
38 , AudioFileSource (s, src->path(), Flag (src->flags() & ~(Writable|Removable|RemovableIfEmpty|RemoveAtDestroy)))
45 assert(_source->n_channels() == 1);
47 int src_type = SRC_SINC_BEST_QUALITY;
51 src_type = SRC_SINC_BEST_QUALITY;
54 src_type = SRC_SINC_MEDIUM_QUALITY;
57 src_type = SRC_SINC_FASTEST;
60 src_type = SRC_ZERO_ORDER_HOLD;
63 src_type = SRC_LINEAR;
68 _ratio = s.nominal_frame_rate() / _source->sample_rate();
69 _src_data.src_ratio = _ratio;
71 src_buffer_size = ceil((double)blocksize / _ratio) + 2;
72 _src_buffer = new float[src_buffer_size];
75 if ((_src_state = src_new (src_type, 1, &err)) == 0) {
76 error << string_compose(_("Import: src_new() failed : %1"), src_strerror (err)) << endmsg ;
77 throw failed_constructor ();
81 SrcFileSource::~SrcFileSource ()
83 DEBUG_TRACE (DEBUG::AudioPlayback, "SrcFileSource::~SrcFileSource\n");
84 _src_state = src_delete (_src_state) ;
85 delete [] _src_buffer;
89 SrcFileSource::read_unlocked (Sample *dst, framepos_t start, framecnt_t cnt) const
92 const double srccnt = cnt / _ratio;
94 if (_target_position != start) {
95 DEBUG_TRACE (DEBUG::AudioPlayback, string_compose ("SRC: reset %1 -> %2\n", _target_position, start));
96 src_reset(_src_state);
98 _source_position = start / _ratio;
99 _target_position = start;
102 const framecnt_t scnt = ceilf(srccnt - _fract_position);
103 _fract_position += (scnt - srccnt);
106 if (scnt >= src_buffer_size) {
107 DEBUG_TRACE (DEBUG::AudioPlayback, string_compose ("SRC: CRASH AHEAD :) %1 >= %2 (fract=%3, cnt=%4)\n",
108 scnt, src_buffer_size, _fract_position, cnt));
111 assert(scnt < src_buffer_size);
113 _src_data.input_frames = _source->read (_src_buffer, _source_position, scnt);
115 if ((framecnt_t) _src_data.input_frames < scnt
116 || _source_position + scnt >= _source->length(0)) {
117 _src_data.end_of_input = true;
118 _target_position += _src_data.input_frames * _ratio;
119 DEBUG_TRACE (DEBUG::AudioPlayback, "SRC: END OF INPUT\n");
121 _src_data.end_of_input = false;
122 _target_position += cnt;
125 _src_data.output_frames = cnt;
126 _src_data.data_in = _src_buffer;
127 _src_data.data_out = dst;
129 if (_src_data.end_of_input) {
130 _src_data.output_frames = std::min ((long)floor(_src_data.input_frames * _ratio), _src_data.output_frames);
134 if ((err = src_process (_src_state, &_src_data))) {
135 error << string_compose(_("SrcFileSource: %1"), src_strerror (err)) << endmsg ;
139 if (_src_data.end_of_input && _src_data.output_frames_gen <= 0) {
143 _source_position += _src_data.input_frames_used;
145 framepos_t saved_target = _target_position;
146 framecnt_t generated = _src_data.output_frames_gen;
148 while (generated < cnt) {
149 DEBUG_TRACE (DEBUG::AudioPlayback, string_compose ("SRC: recurse for %1 samples\n", cnt - generated));
150 framecnt_t g = read_unlocked(dst + generated, _target_position, cnt - generated);
154 _target_position = saved_target;
156 DEBUG_TRACE (DEBUG::AudioPlayback, string_compose ("SRC: in: %1-> want: %2 || got: %3 total: %4\n",
157 _src_data.input_frames, _src_data.output_frames, _src_data.output_frames_gen, generated));