Audacity 3.2.0
WaveClipUIUtilities.cpp
Go to the documentation of this file.
1/**********************************************************************
2
3 Audacity: A Digital Audio Editor
4
5 @file WaveClipUIUtilities.cpp
6
7 Paul Licameli split from WaveClip.cpp
8
9**********************************************************************/
10
11#include "WaveClipUIUtilities.h"
12
13#include "PitchAndSpeedDialog.h"
14#include "ProjectHistory.h"
15#include "SampleCount.h"
16#include "UndoManager.h"
17#include "ViewInfo.h"
18#include "WaveClip.h"
19#include <algorithm>
20#include <cassert>
21#include <cmath>
22
24 const std::vector<sampleCount>& oldWhere, size_t oldLen, size_t newLen,
25 double t0, double sampleRate, double stretchRatio, double samplesPerPixel,
26 int& oldX0, double& correction)
27{
28 // Mitigate the accumulation of location errors
29 // in copies of copies of ... of caches.
30 // Look at the loop that populates "where" below to understand this.
31
32 // Find the sample position that is the origin in the old cache.
33 const double oldWhere0 = oldWhere[1].as_double() - samplesPerPixel;
34 const double oldWhereLast = oldWhere0 + oldLen * samplesPerPixel;
35 // Find the length in samples of the old cache.
36 const double denom = oldWhereLast - oldWhere0;
37
38 // What sample would go in where[0] with no correction?
39 const double guessWhere0 = t0 * sampleRate / stretchRatio;
40
41 if ( // Skip if old and NEW are disjoint:
42 oldWhereLast <= guessWhere0 ||
43 guessWhere0 + newLen * samplesPerPixel <= oldWhere0 ||
44 // Skip unless denom rounds off to at least 1.
45 denom < 0.5)
46 {
47 // The computation of oldX0 in the other branch
48 // may underflow and the assertion would be violated.
49 oldX0 = oldLen;
50 correction = 0.0;
51 }
52 else
53 {
54 // What integer position in the old cache array does that map to?
55 // (even if it is out of bounds)
56 oldX0 = floor(0.5 + oldLen * (guessWhere0 - oldWhere0) / denom);
57 // What sample count would the old cache have put there?
58 const double where0 = oldWhere0 + double(oldX0) * samplesPerPixel;
59 // What correction is needed to align the NEW cache with the old?
60 const double correction0 = where0 - guessWhere0;
61 correction = std::clamp(correction0, -samplesPerPixel, samplesPerPixel);
62 assert(correction == correction0);
63 }
64}
65
67 std::vector<sampleCount>& where, size_t len, bool addBias, double correction,
68 double t0, double sampleRate, double stretchRatio, double samplesPerPixel)
69{
70 // Be careful to make the first value non-negative
71 const auto bias = addBias ? .5 : 0.;
72 const double w0 = 0.5 + correction + bias + t0 * sampleRate / stretchRatio;
73 where[0] = sampleCount(std::max(0.0, floor(w0)));
74 for (decltype(len) x = 1; x < len + 1; x++)
75 where[x] = sampleCount(floor(w0 + double(x) * samplesPerPixel));
76}
77
78std::vector<CommonTrackPanelCell::MenuItem>
80{
81 return {
82 { L"Cut", XO("Cut") },
83 { L"Copy", XO("Copy") },
84 { L"Paste", XO("Paste") },
85 {},
86 { L"Split", XO("Split Clip") },
87 { L"Join", XO("Join Clips") },
88 { L"TrackMute", XO("Mute/Unmute Track") },
89 {},
90 { L"RenameClip", XO("Rename Clip...") },
91 { L"ChangePitchAndSpeed", XO("Pitch and Speed...") },
92 { L"RenderPitchAndSpeed", XO("Render Pitch and Speed") },
93 };
94 ;
95}
96
98 AudacityProject& project, double speedInPercent)
99{
101 /* i18n-hint: This is about changing the clip playback speed, speed is in
102 percent */
103 XO("Changed Clip Speed to %.01f%%").Format(speedInPercent),
104 /* i18n-hint: This is about changing the clip playback speed, speed is in
105 percent */
106 XO("Changed Speed to %.01f%%").Format(speedInPercent),
108}
109
112{
113 auto& viewInfo = ViewInfo::Get(project);
114 viewInfo.selectedRegion.setTimes(
115 clip.GetPlayStartTime(), clip.GetPlayEndTime());
116}
XO("Cut/Copy/Paste")
const auto project
The top-level handle to an Audacity project. It serves as a source of events that other objects can b...
Definition: Project.h:90
Abstract base class used in importing a file.
void PushState(const TranslatableString &desc, const TranslatableString &shortDesc)
static ProjectHistory & Get(AudacityProject &project)
static ViewInfo & Get(AudacityProject &project)
Definition: ViewInfo.cpp:235
This allows multiple clips to be a part of one WaveTrack.
Definition: WaveClip.h:238
double GetPlayStartTime() const noexcept override
Definition: WaveClip.cpp:1762
double GetPlayEndTime() const override
Definition: WaveClip.cpp:1772
Positions or offsets within audio files need a wide type.
Definition: SampleCount.h:19
void SelectClip(AudacityProject &project, const WaveTrack::Interval &clip)
void PushClipSpeedChangedUndoState(AudacityProject &project, double speedInPercent)
std::vector< CommonTrackPanelCell::MenuItem > GetWaveClipMenuItems()
AUDACITY_DLL_API void fillWhere(std::vector< sampleCount > &where, size_t len, bool addBias, double correction, double t0, double sampleRate, double stretchRatio, double samplesPerPixel)
AUDACITY_DLL_API void findCorrection(const std::vector< sampleCount > &oldWhere, size_t oldLen, size_t newLen, double t0, double sampleRate, double stretchRatio, double samplesPerPixel, int &oldX0, double &correction)