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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*!********************************************************************
Audacity: A Digital Audio Editor
StretchingSequence.cpp
Matthieu Hodgkinson
**********************************************************************/
#include "StretchingSequence.h"
#include "AudioSegment.h"
#include "AudioSegmentFactory.h"
#include "StaffPadTimeAndPitch.h"
#include <cassert>
namespace
{
void GetOffsetBuffer(
float** offsetBuffer, float* const* buffer, size_t numChannels,
size_t offset)
{
for (auto i = 0u; i < numChannels; ++i)
offsetBuffer[i] = buffer[i] + offset;
}
} // namespace
StretchingSequence::StretchingSequence(
const PlayableSequence& sequence, int sampleRate, size_t numChannels,
std::unique_ptr<AudioSegmentFactoryInterface> factory)
: mSequence { sequence }
, mAudioSegmentFactory { std::move(factory) }
{
}
void StretchingSequence::ResetCursor(double t, PlaybackDirection direction)
{
mAudioSegments =
mAudioSegmentFactory->CreateAudioSegmentSequence(t, direction);
mActiveAudioSegmentIt = mAudioSegments.begin();
mPlaybackDirection = direction;
mExpectedStart = TimeToLongSamples(t);
}
bool StretchingSequence::GetNext(
float* const buffers[], size_t numChannels, size_t numSamples)
{
if (!mExpectedStart.has_value())
ResetCursor(0., PlaybackDirection::forward);
auto numProcessedSamples = 0u;
while (numProcessedSamples < numSamples &&
mActiveAudioSegmentIt != mAudioSegments.end())
{
const auto& segment = *mActiveAudioSegmentIt;
// More-than-stereo isn't supported
assert(mSequence.NChannels() <= 2);
float* offsetBuffers[2] {};
GetOffsetBuffer(
offsetBuffers, buffers, mSequence.NChannels(), numProcessedSamples);
numProcessedSamples += segment->GetFloats(
offsetBuffers,
numSamples - numProcessedSamples); // No need to reverse, we feed the
// time-stretching algorithm with
// reversed samples already.
if (segment->Empty())
++mActiveAudioSegmentIt;
}
const auto remaining = numSamples - numProcessedSamples;
if (remaining > 0u)
{
// More-than-stereo isn't supported
assert(mSequence.NChannels() <= 2);
float* offsetBuffers[2] {};
GetOffsetBuffer(
offsetBuffers, buffers, mSequence.NChannels(), numProcessedSamples);
for (auto i = 0u; i < mSequence.NChannels(); ++i)
std::fill(offsetBuffers[i], offsetBuffers[i] + remaining, 0.f);
}
mExpectedStart =
mPlaybackDirection == PlaybackDirection::forward ?
*mExpectedStart + numSamples :
*mExpectedStart - static_cast<sampleCount::type>(numSamples);
return true;
}
size_t StretchingSequence::NChannels() const
{
return mSequence.NChannels();
}
float StretchingSequence::GetChannelVolume(int channel) const
{
return mSequence.GetChannelVolume(channel);
}
bool StretchingSequence::DoGet(
size_t iChannel, size_t nBuffers, const samplePtr buffers[],
sampleFormat format, sampleCount start, size_t len, bool backwards,
fillFormat fill, bool mayThrow, sampleCount* pNumWithinClips) const
{
return const_cast<StretchingSequence&>(*this).MutableGet(
iChannel, nBuffers, buffers, format, start, len, backwards);
}
const ChannelGroup* StretchingSequence::FindChannelGroup() const
{
return mSequence.FindChannelGroup();
}
bool StretchingSequence::GetSolo() const
{
return mSequence.GetSolo();
}
bool StretchingSequence::GetMute() const
{
return mSequence.GetMute();
}
double StretchingSequence::GetStartTime() const
{
return mSequence.GetStartTime();
}
double StretchingSequence::GetEndTime() const
{
return mSequence.GetEndTime();
}
double StretchingSequence::GetRate() const
{
return mSequence.GetRate();
}
sampleFormat StretchingSequence::WidestEffectiveFormat() const
{
return mSequence.WidestEffectiveFormat();
}
bool StretchingSequence::HasTrivialEnvelope() const
{
return mSequence.HasTrivialEnvelope();
}
void StretchingSequence::GetEnvelopeValues(
double* buffer, size_t bufferLen, double t0, bool backwards) const
{
mSequence.GetEnvelopeValues(buffer, bufferLen, t0, backwards);
}
AudioGraph::ChannelType StretchingSequence::GetChannelType() const
{
return mSequence.GetChannelType();
}
bool StretchingSequence::GetFloats(
float* buffers[], sampleCount start, size_t len, bool backwards) const
{
std::vector<samplePtr> charBuffers;
const auto nChannels = NChannels();
charBuffers.reserve(nChannels);
for (auto i = 0u; i < nChannels; ++i)
charBuffers.push_back(reinterpret_cast<samplePtr>(buffers[i]));
constexpr auto iChannel = 0u;
return DoGet(
iChannel, nChannels, charBuffers.data(), sampleFormat::floatSample, start,
len, backwards);
}
bool StretchingSequence::MutableGet(
size_t iChannel, size_t nBuffers, const samplePtr buffers[],
sampleFormat format, sampleCount start, size_t len, bool backwards)
{
// StretchingSequence is not expected to be used for any other case.
assert(iChannel == 0u);
if (
!mExpectedStart.has_value() || *mExpectedStart != start ||
(mPlaybackDirection == PlaybackDirection::backward != backwards))
{
const auto t = start.as_double() / mSequence.GetRate();
ResetCursor(
t,
backwards ? PlaybackDirection::backward : PlaybackDirection::forward);
}
return GetNext(reinterpret_cast<float* const*>(buffers), nBuffers, len);
}
std::shared_ptr<StretchingSequence> StretchingSequence::Create(
const PlayableSequence& sequence, const ClipConstHolders& clips)
{
const int sampleRate = sequence.GetRate();
return std::make_shared<StretchingSequence>(
sequence, sampleRate, sequence.NChannels(),
std::make_unique<AudioSegmentFactory>(
sampleRate, sequence.NChannels(), clips));
}
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