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filter/TwoFilters: add class PreparedTwoFilters

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This commit is contained in:
Max Kellermann 2021-08-26 17:17:55 +02:00
parent 38a4b0d8d5
commit 49dcac5c21
2 changed files with 40 additions and 0 deletions
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21
src/filter/plugins/TwoFilters.cxx
View File

@ -18,7 +18,10 @@
*/
#include "TwoFilters.hxx"
#include "pcm/AudioFormat.hxx"
#include "util/ConstBuffer.hxx"
#include "util/RuntimeError.hxx"
#include "util/StringBuffer.hxx"
ConstBuffer<void>
TwoFilters::FilterPCM(ConstBuffer<void> src)
@ -37,3 +40,21 @@ TwoFilters::Flush()
return second->Flush();
}
std::unique_ptr<Filter>
PreparedTwoFilters::Open(AudioFormat &audio_format)
{
auto a = first->Open(audio_format);
const auto &a_out_format = a->GetOutAudioFormat();
auto b_in_format = a_out_format;
auto b = second->Open(b_in_format);
if (b_in_format != a_out_format)
throw FormatRuntimeError("Audio format not supported by filter '%s': %s",
second_name.c_str(),
ToString(a_out_format).c_str());
return std::make_unique<TwoFilters>(std::move(a),
std::move(b));
}

19
src/filter/plugins/TwoFilters.hxx
View File

@ -21,8 +21,10 @@
#define MPD_TWO_FILTERS_HXX
#include "filter/Filter.hxx"
#include "filter/Prepared.hxx"
#include <memory>
#include <string>
/**
* A #Filter implementation which chains two other filters.
@ -46,4 +48,21 @@ public:
ConstBuffer<void> Flush() override;
};
/**
* Like #TwoFilters, but implements the #PreparedFilter interface.
*/
class PreparedTwoFilters final : public PreparedFilter {
std::unique_ptr<PreparedFilter> first, second;
std::string second_name;
public:
template<typename F, typename S, typename N>
PreparedTwoFilters(F &&_first, S &&_second, N &&_second_name) noexcept
:first(std::forward<F>(_first)),
second(std::forward<S>(_second)),
second_name(std::forward<N>(_second_name)) {}
std::unique_ptr<Filter> Open(AudioFormat &audio_format) override;
};
#endif