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[EGD-6800] Enable voice transcoding

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Add voice transcoding during phone call with two basic transforms:
 - sample rate downscaling by a factor of 2 with a decimator
 - sample rate upscaling by a factor of 2 with an interpolator (no
low-pass filter)

Signed-off-by: Marcin Smoczyński <smoczynski.marcin@gmail.com>
This commit is contained in:
Marcin Smoczyński
2021-05-19 23:00:08 +02:00
parent fe79d2d934
commit ece6a51e5b
23 changed files with 640 additions and 202 deletions
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31
module-audio/Audio/transcode/InputTranscodeProxy.cpp
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@@ -4,13 +4,15 @@
#include "InputTranscodeProxy.hpp"
#include "Transform.hpp"
#include <memory>
#include <utility>
using audio::transcode::InputTranscodeProxy;
InputTranscodeProxy::InputTranscodeProxy(AbstractStream &wrappedStream, Transform &transform) noexcept
InputTranscodeProxy::InputTranscodeProxy(std::shared_ptr<AbstractStream> wrappedStream,
std::shared_ptr<Transform> transform) noexcept
: StreamProxy(wrappedStream), transform(transform),
transcodingSpaceSize(transform.getTransformSize(wrappedStream.getInputTraits().blockSize)),
transcodingSpaceSize(transform->transformBlockSizeInverted(wrappedStream->getInputTraits().blockSize)),
transcodingSpace(std::make_unique<std::uint8_t[]>(transcodingSpaceSize)), transcodingSpaceSpan{
.data = transcodingSpace.get(),
.dataSize = transcodingSpaceSize}
@@ -18,23 +20,26 @@ InputTranscodeProxy::InputTranscodeProxy(AbstractStream &wrappedStream, Transfor
bool InputTranscodeProxy::push(const Span &span)
{
return getWrappedStream().push(transform.transform(span, transcodingSpaceSpan));
return getWrappedStream().push(transform->transform(span, transcodingSpaceSpan));
}
void InputTranscodeProxy::commit()
{
transform.transform(peekedSpan, transcodingSpaceSpan);
getWrappedStream().commit();
peekedSpan.reset();
if (isReserved) {
transform->transform(transcodingSpaceSpan, reservedSpan);
getWrappedStream().commit();
reservedSpan.reset();
isReserved = false;
}
}
bool InputTranscodeProxy::peek(Span &span)
bool InputTranscodeProxy::reserve(Span &span)
{
auto result = getWrappedStream().peek(span);
auto result = getWrappedStream().reserve(span);
if (result) {
peekedSpan = span;
}
reservedSpan = span;
span = transcodingSpaceSpan;
isReserved = true;
return result;
}
@@ -42,8 +47,8 @@ bool InputTranscodeProxy::peek(Span &span)
auto InputTranscodeProxy::getInputTraits() const noexcept -> Traits
{
auto originalTraits = StreamProxy::getInputTraits();
auto transcodedFormat = transform.transformFormat(originalTraits.format);
auto transcodedBlockSize = transform.transformBlockSize(originalTraits.blockSize);
auto transcodedFormat = transform->transformFormat(originalTraits.format);
auto transcodedBlockSize = transform->transformBlockSizeInverted(originalTraits.blockSize);
return Traits{.blockSize = transcodedBlockSize, .format = transcodedFormat};
}