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output/Interface: convert to abstract class

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Yet another C-style vtable replaced with C++.
This commit is contained in:
Max Kellermann
2017-08-09 16:58:44 +02:00
parent 1cf7f3d87c
commit 31bad5f7af
30 changed files with 531 additions and 1130 deletions
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47
src/output/plugins/NullOutputPlugin.cxx
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@@ -20,43 +20,41 @@
#include "config.h"
#include "NullOutputPlugin.hxx"
#include "../OutputAPI.hxx"
#include "../Wrapper.hxx"
#include "../Timer.hxx"
class NullOutput {
friend struct AudioOutputWrapper<NullOutput>;
AudioOutput base;
class NullOutput final : AudioOutput {
const bool sync;
Timer *timer;
public:
NullOutput(const ConfigBlock &block)
:base(null_output_plugin),
:AudioOutput(0),
sync(block.GetBlockValue("sync", true)) {}
static NullOutput *Create(EventLoop &event_loop,
const ConfigBlock &block);
static AudioOutput *Create(EventLoop &,
const ConfigBlock &block) {
return new NullOutput(block);
}
void Open(AudioFormat &audio_format) {
private:
void Open(AudioFormat &audio_format) override {
if (sync)
timer = new Timer(audio_format);
}
void Close() {
void Close() noexcept override {
if (sync)
delete timer;
}
std::chrono::steady_clock::duration Delay() const noexcept {
std::chrono::steady_clock::duration Delay() const noexcept override {
return sync && timer->IsStarted()
? timer->GetDelay()
: std::chrono::steady_clock::duration::zero();
}
size_t Play(gcc_unused const void *chunk, size_t size) {
size_t Play(gcc_unused const void *chunk, size_t size) override {
if (sync) {
if (!timer->IsStarted())
timer->Start();
@@ -66,34 +64,15 @@ public:
return size;
}
void Cancel() {
void Cancel() noexcept override {
if (sync)
timer->Reset();
}
};
inline NullOutput *
NullOutput::Create(EventLoop &, const ConfigBlock &block)
{
return new NullOutput(block);
}
typedef AudioOutputWrapper<NullOutput> Wrapper;
const struct AudioOutputPlugin null_output_plugin = {
"null",
nullptr,
&Wrapper::Init,
&Wrapper::Finish,
nullptr,
nullptr,
&Wrapper::Open,
&Wrapper::Close,
&Wrapper::Delay,
nullptr,
&Wrapper::Play,
nullptr,
&Wrapper::Cancel,
nullptr,
&NullOutput::Create,
nullptr,
};