Extract common stuff for wrapper audio providers to a base class

aegisub/src/audio_provider_convert.cpp

@@ -31,30 +31,12 @@
 
 #include <limits>
 
-/// Base class for all wrapping converters
-class AudioProviderConverter : public AudioProvider {
-protected:
-	std::unique_ptr<AudioProvider> source;
-public:
-	AudioProviderConverter(std::unique_ptr<AudioProvider> src)
-	: source(std::move(src))
-	{
-		channels = source->GetChannels();
-		num_samples = source->GetNumSamples();
-		sample_rate = source->GetSampleRate();
-		bytes_per_sample = source->GetBytesPerSample();
-		float_samples = source->AreSamplesFloat();
-	}
-
-	agi::fs::path GetFilename() const { return source->GetFilename(); }
-};
-
 /// Anything integral -> 16 bit signed machine-endian audio converter
 template<class Target>
-class BitdepthConvertAudioProvider : public AudioProviderConverter {
+class BitdepthConvertAudioProvider : public AudioProviderWrapper {
 	int src_bytes_per_sample;
 public:
-	BitdepthConvertAudioProvider(std::unique_ptr<AudioProvider> src) : AudioProviderConverter(std::move(src)) {
+	BitdepthConvertAudioProvider(std::unique_ptr<AudioProvider> src) : AudioProviderWrapper(std::move(src)) {
 		if (bytes_per_sample > 8)
 			throw agi::AudioProviderOpenError("Audio format converter: audio with bitdepths greater than 64 bits/sample is currently unsupported", 0);
 
@@ -92,9 +74,9 @@ public:
 
 /// Floating point -> 16 bit signed machine-endian audio converter
 template<class Source, class Target>
-class FloatConvertAudioProvider : public AudioProviderConverter {
+class FloatConvertAudioProvider : public AudioProviderWrapper {
 public:
-	FloatConvertAudioProvider(std::unique_ptr<AudioProvider> src) : AudioProviderConverter(std::move(src)) {
+	FloatConvertAudioProvider(std::unique_ptr<AudioProvider> src) : AudioProviderWrapper(std::move(src)) {
 		bytes_per_sample = sizeof(Target);
 		float_samples = false;
 	}
@@ -123,10 +105,10 @@ public:
 };
 
 /// Non-mono 16-bit signed machine-endian -> mono 16-bit signed machine endian converter
-class DownmixAudioProvider : public AudioProviderConverter {
+class DownmixAudioProvider : public AudioProviderWrapper {
 	int src_channels;
 public:
-	DownmixAudioProvider(std::unique_ptr<AudioProvider> src) : AudioProviderConverter(std::move(src)) {
+	DownmixAudioProvider(std::unique_ptr<AudioProvider> src) : AudioProviderWrapper(std::move(src)) {
 		if (bytes_per_sample != 2)
 			throw agi::InternalError("DownmixAudioProvider requires 16-bit input", 0);
 		if (channels == 1)
@@ -154,9 +136,9 @@ public:
 
 /// Sample doubler with linear interpolation for the agi::util::make_unique<samples>
 /// Requires 16-bit mono input
-class SampleDoublingAudioProvider : public AudioProviderConverter {
+class SampleDoublingAudioProvider : public AudioProviderWrapper {
 public:
-	SampleDoublingAudioProvider(std::unique_ptr<AudioProvider> src) : AudioProviderConverter(std::move(src)) {
+	SampleDoublingAudioProvider(std::unique_ptr<AudioProvider> src) : AudioProviderWrapper(std::move(src)) {
 		if (source->GetBytesPerSample() != 2)
 			throw agi::InternalError("UpsampleAudioProvider requires 16-bit input", 0);
 		if (source->GetChannels() != 1)

aegisub/src/audio_provider_hd.cpp

@@ -89,14 +89,9 @@ public:
 
 }
 
-HDAudioProvider::HDAudioProvider(std::unique_ptr<AudioProvider> src, agi::BackgroundRunner *br) {
-	bytes_per_sample = src->GetBytesPerSample();
-	num_samples      = src->GetNumSamples();
-	channels         = src->GetChannels();
-	sample_rate      = src->GetSampleRate();
-	filename         = src->GetFilename();
-	float_samples    = src->AreSamplesFloat();
-
+HDAudioProvider::HDAudioProvider(std::unique_ptr<AudioProvider> src, agi::BackgroundRunner *br)
+: AudioProviderWrapper(std::move(src))
+{
 	// Check free space
 	if ((uint64_t)num_samples * channels * bytes_per_sample > agi::fs::FreeSpace(cache_dir()))
 		throw agi::AudioCacheOpenError("Not enough free disk space in " + cache_dir().string() + " to cache the audio", 0);
@@ -106,9 +101,9 @@ HDAudioProvider::HDAudioProvider(std::unique_ptr<AudioProvider> src, agi::Backgr
 	try {
 		{
 			agi::io::Save out(diskCacheFilename, true);
-			br->Run(bind(&HDAudioProvider::FillCache, this, src.get(), &out.Get(), std::placeholders::_1));
+			br->Run(bind(&HDAudioProvider::FillCache, this, source.get(), &out.Get(), std::placeholders::_1));
 		}
-		cache_provider = agi::util::make_unique<RawAudioProvider>(diskCacheFilename, src.get());
+		cache_provider = agi::util::make_unique<RawAudioProvider>(diskCacheFilename, source.get());
 	}
 	catch (...) {
 		agi::fs::Remove(diskCacheFilename);

aegisub/src/audio_provider_hd.h

@@ -39,7 +39,7 @@ namespace agi {
 	class ProgressSink;
 }
 
-class HDAudioProvider : public AudioProvider {
+class HDAudioProvider : public AudioProviderWrapper {
 	/// Name of the file which the decoded audio is written to
 	agi::fs::path diskCacheFilename;
 	/// Audio provider which reads from the decoded cache

aegisub/src/audio_provider_lock.cpp

@@ -21,13 +21,8 @@
 #include "audio_provider_lock.h"
 
 LockAudioProvider::LockAudioProvider(std::unique_ptr<AudioProvider> src)
-: source(std::move(src))
+: AudioProviderWrapper(std::move(src))
 {
-	channels = source->GetChannels();
-	num_samples = source->GetNumSamples();
-	sample_rate = source->GetSampleRate();
-	bytes_per_sample = source->GetBytesPerSample();
-	float_samples = source->AreSamplesFloat();
 }
 
 void LockAudioProvider::FillBuffer(void *buf, int64_t start, int64_t count) const {

aegisub/src/audio_provider_lock.h

@@ -21,8 +21,7 @@
 #include <memory>
 #include <mutex>
 
-class LockAudioProvider : public AudioProvider {
-	std::unique_ptr<const AudioProvider> source;
+class LockAudioProvider : public AudioProviderWrapper {
 	mutable std::mutex mutex;
 
 	void FillBuffer(void *buf, int64_t start, int64_t count) const;

aegisub/src/audio_provider_ram.cpp

@@ -46,23 +46,17 @@
 #define CacheBits 22
 #define CacheBlockSize (1 << CacheBits)
 
-RAMAudioProvider::RAMAudioProvider(std::unique_ptr<AudioProvider> src, agi::BackgroundRunner *br) {
+RAMAudioProvider::RAMAudioProvider(std::unique_ptr<AudioProvider> src, agi::BackgroundRunner *br)
+: AudioProviderWrapper(std::move(src))
+{
 	try {
-		blockcache.resize((src->GetNumSamples() * src->GetBytesPerSample() + CacheBlockSize - 1) >> CacheBits);
+		blockcache.resize((source->GetNumSamples() * source->GetBytesPerSample() + CacheBlockSize - 1) >> CacheBits);
 	}
 	catch (std::bad_alloc const&) {
 		throw agi::AudioCacheOpenError("Couldn't open audio, not enough ram available.", 0);
 	}
 
-	// Copy parameters
-	bytes_per_sample = src->GetBytesPerSample();
-	num_samples = src->GetNumSamples();
-	channels = src->GetChannels();
-	sample_rate = src->GetSampleRate();
-	filename = src->GetFilename();
-	float_samples = src->AreSamplesFloat();
-
-	br->Run(std::bind(&RAMAudioProvider::FillCache, this, src.get(), std::placeholders::_1));
+	br->Run(std::bind(&RAMAudioProvider::FillCache, this, source.get(), std::placeholders::_1));
 }
 
 void RAMAudioProvider::FillCache(AudioProvider *source, agi::ProgressSink *ps) {

aegisub/src/audio_provider_ram.h

@@ -42,7 +42,7 @@ namespace agi {
 	class ProgressSink;
 }
 
-class RAMAudioProvider : public AudioProvider {
+class RAMAudioProvider : public AudioProviderWrapper {
 #ifdef _MSC_VER
 	boost::container::stable_vector<char[1 << 22]> blockcache;
 #else

aegisub/src/include/aegisub/audio_provider.h

@@ -73,6 +73,23 @@ public:
 	virtual bool NeedsCache() const { return false; }
 };
 
+/// Helper base class for an audio provider which wraps another provider
+class AudioProviderWrapper : public AudioProvider {
+protected:
+	std::unique_ptr<AudioProvider> source;
+public:
+	AudioProviderWrapper(std::unique_ptr<AudioProvider> src)
+	: source(std::move(src))
+	{
+		channels = source->GetChannels();
+		num_samples = source->GetNumSamples();
+		sample_rate = source->GetSampleRate();
+		bytes_per_sample = source->GetBytesPerSample();
+		float_samples = source->AreSamplesFloat();
+		filename = source->GetFilename();
+	}
+};
+
 class AudioProviderFactory : public Factory1<AudioProvider, agi::fs::path> {
 public:
 	static void RegisterProviders();