69 lines
1.4 KiB
C++
69 lines
1.4 KiB
C++
#include <psemek/audio/combine/loop.hpp>
|
|
#include <psemek/audio/combine/duplicate.hpp>
|
|
|
|
namespace psemek::audio
|
|
{
|
|
|
|
namespace
|
|
{
|
|
|
|
struct loop_impl
|
|
: stream
|
|
{
|
|
loop_impl(track_ptr dup, std::optional<std::size_t> count)
|
|
: dup_(std::move(dup))
|
|
, stream_(dup_->stream())
|
|
, count_(count)
|
|
{}
|
|
|
|
std::optional<std::size_t> length() const override
|
|
{
|
|
if (count_)
|
|
return (*stream_->length()) * (*count_);
|
|
return std::nullopt;
|
|
}
|
|
|
|
std::size_t read(util::span<float> samples) override
|
|
{
|
|
std::size_t count = 0;
|
|
while (count < samples.size() && (!count_ || repeated_ < *count_))
|
|
{
|
|
auto need = samples.size() - count;
|
|
auto scount = stream_->read({samples.begin() + count, need});
|
|
count += scount;
|
|
if (scount < need)
|
|
{
|
|
++repeated_;
|
|
stream_ = dup_->stream();
|
|
}
|
|
}
|
|
return count;
|
|
}
|
|
|
|
std::size_t played() const override
|
|
{
|
|
return stream_->played() + (*stream_->length()) * repeated_;
|
|
}
|
|
|
|
private:
|
|
track_ptr dup_;
|
|
stream_ptr stream_;
|
|
std::optional<std::size_t> count_;
|
|
std::size_t repeated_ = 0;
|
|
};
|
|
|
|
}
|
|
|
|
stream_ptr loop(track_ptr track, std::optional<std::size_t> count)
|
|
{
|
|
return std::make_shared<loop_impl>(track, count);
|
|
}
|
|
|
|
stream_ptr loop(stream_ptr stream, std::optional<std::size_t> count)
|
|
{
|
|
if (!stream->length())
|
|
return stream;
|
|
return loop(make_duplicator(std::move(stream)), count);
|
|
}
|
|
|
|
}
|