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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*!********************************************************************
Audacity: A Digital Audio Editor
AudioSegmentFactory.cpp
Matthieu Hodgkinson
**********************************************************************/
#include "AudioSegmentFactory.h"
#include "ClipInterface.h"
#include "ClipSegment.h"
#include "SilenceSegment.h"
#include "TimeAndPitchInterface.h"
#include <algorithm>
using ClipConstHolder = std::shared_ptr<const ClipInterface>;
AudioSegmentFactory::AudioSegmentFactory(
int sampleRate, int numChannels, ClipConstHolders clips)
: mClips { std::move(clips) }
, mSampleRate { sampleRate }
, mNumChannels { numChannels }
{
}
std::vector<std::shared_ptr<AudioSegment>>
AudioSegmentFactory::CreateAudioSegmentSequence(
double playbackStartTime, PlaybackDirection direction)
{
return direction == PlaybackDirection::forward ?
CreateAudioSegmentSequenceForward(playbackStartTime) :
CreateAudioSegmentSequenceBackward(playbackStartTime);
}
std::vector<std::shared_ptr<AudioSegment>>
AudioSegmentFactory::CreateAudioSegmentSequenceForward(double t0)
{
auto sortedClips = mClips;
std::sort(
sortedClips.begin(), sortedClips.end(),
[](const std::shared_ptr<const ClipInterface>& a,
const std::shared_ptr<const ClipInterface>& b) {
return a->GetPlayStartTime() < b->GetPlayStartTime();
});
std::vector<std::shared_ptr<AudioSegment>> segments;
for (const auto& clip : sortedClips)
{
if (clip->GetPlayStartTime() > t0)
{
const auto numSamples =
sampleCount { (clip->GetPlayStartTime() - t0) * mSampleRate + .5 };
segments.push_back(
std::make_shared<SilenceSegment>(mNumChannels, numSamples));
t0 = clip->GetPlayStartTime();
}
else if (clip->GetPlayEndTime() <= t0)
continue;
segments.push_back(std::make_shared<ClipSegment>(
*clip, t0 - clip->GetPlayStartTime(), PlaybackDirection::forward));
t0 = clip->GetPlayEndTime();
}
return segments;
}
std::vector<std::shared_ptr<AudioSegment>>
AudioSegmentFactory::CreateAudioSegmentSequenceBackward(double t0)
{
auto sortedClips = mClips;
std::sort(
sortedClips.begin(), sortedClips.end(),
[&](
const std::shared_ptr<const ClipInterface>& a,
const std::shared_ptr<const ClipInterface>& b) {
return a->GetPlayEndTime() > b->GetPlayEndTime();
});
std::vector<std::shared_ptr<AudioSegment>> segments;
for (const auto& clip : sortedClips)
{
if (clip->GetPlayEndTime() < t0)
{
const auto numSamples =
sampleCount { (t0 - clip->GetPlayEndTime()) * mSampleRate + .5 };
segments.push_back(
std::make_shared<SilenceSegment>(mNumChannels, numSamples));
t0 = clip->GetPlayEndTime();
}
else if (clip->GetPlayStartTime() >= t0)
continue;
segments.push_back(std::make_shared<ClipSegment>(
*clip, clip->GetPlayEndTime() - t0, PlaybackDirection::backward));
t0 = clip->GetPlayStartTime();
}
return segments;
}
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