OpenShot Library | OpenShotAudio  0.2.1
juce_AudioSubsectionReader.cpp
1 /*
2  ==============================================================================
3 
4  This file is part of the JUCE library.
5  Copyright (c) 2017 - ROLI Ltd.
6 
7  JUCE is an open source library subject to commercial or open-source
8  licensing.
9 
10  By using JUCE, you agree to the terms of both the JUCE 5 End-User License
11  Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
12  27th April 2017).
13 
14  End User License Agreement: www.juce.com/juce-5-licence
15  Privacy Policy: www.juce.com/juce-5-privacy-policy
16 
17  Or: You may also use this code under the terms of the GPL v3 (see
18  www.gnu.org/licenses).
19 
20  JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
21  EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
22  DISCLAIMED.
23 
24  ==============================================================================
25 */
26 
27 namespace juce
28 {
29 
31  int64 startSampleToUse, int64 lengthToUse,
32  bool deleteSource)
33  : AudioFormatReader (nullptr, sourceToUse->getFormatName()),
34  source (sourceToUse),
35  startSample (startSampleToUse),
36  deleteSourceWhenDeleted (deleteSource)
37 {
38  length = jmin (jmax ((int64) 0, source->lengthInSamples - startSample), lengthToUse);
39 
40  sampleRate = source->sampleRate;
41  bitsPerSample = source->bitsPerSample;
42  lengthInSamples = length;
43  numChannels = source->numChannels;
45 }
46 
48 {
49  if (deleteSourceWhenDeleted)
50  delete source;
51 }
52 
53 //==============================================================================
54 bool AudioSubsectionReader::readSamples (int** destSamples, int numDestChannels, int startOffsetInDestBuffer,
55  int64 startSampleInFile, int numSamples)
56 {
57  clearSamplesBeyondAvailableLength (destSamples, numDestChannels, startOffsetInDestBuffer,
58  startSampleInFile, numSamples, length);
59 
60  return source->readSamples (destSamples, numDestChannels, startOffsetInDestBuffer,
61  startSampleInFile + startSample, numSamples);
62 }
63 
64 void AudioSubsectionReader::readMaxLevels (int64 startSampleInFile, int64 numSamples, Range<float>* results, int numChannelsToRead)
65 {
66  startSampleInFile = jmax ((int64) 0, startSampleInFile);
67  numSamples = jmax ((int64) 0, jmin (numSamples, length - startSampleInFile));
68 
69  source->readMaxLevels (startSampleInFile + startSample, numSamples, results, numChannelsToRead);
70 }
71 
72 } // namespace juce
static void clearSamplesBeyondAvailableLength(int **destChannels, int numDestChannels, int startOffsetInDestBuffer, int64 startSampleInFile, int &numSamples, int64 fileLengthInSamples)
Used by AudioFormatReader subclasses to clear any parts of the data blocks that lie beyond the end of...
AudioSubsectionReader(AudioFormatReader *sourceReader, int64 subsectionStartSample, int64 subsectionLength, bool deleteSourceWhenDeleted)
Creates an AudioSubsectionReader for a given data source.
bool usesFloatingPointData
Indicates whether the data is floating-point or fixed.
int64 lengthInSamples
The total number of samples in the audio stream.
unsigned int bitsPerSample
The number of bits per sample, e.g.
virtual void readMaxLevels(int64 startSample, int64 numSamples, Range< float > *results, int numChannelsToRead)
Finds the highest and lowest sample levels from a section of the audio stream.
void readMaxLevels(int64 startSample, int64 numSamples, Range< float > *results, int numChannelsToRead) override
Finds the highest and lowest sample levels from a section of the audio stream.
bool readSamples(int **destSamples, int numDestChannels, int startOffsetInDestBuffer, int64 startSampleInFile, int numSamples) override
Subclasses must implement this method to perform the low-level read operation.
~AudioSubsectionReader() override
Destructor.
double sampleRate
The sample-rate of the stream.
virtual bool readSamples(int **destChannels, int numDestChannels, int startOffsetInDestBuffer, int64 startSampleInFile, int numSamples)=0
Subclasses must implement this method to perform the low-level read operation.
Reads samples from an audio file stream.
unsigned int numChannels
The total number of channels in the audio stream.
A general-purpose range object, that simply represents any linear range with a start and end point...
Definition: juce_Range.h:43