mirror of https://github.com/odrling/Aegisub
100 lines
3.7 KiB
C++
100 lines
3.7 KiB
C++
// Copyright (c) 2006, Rodrigo Braz Monteiro
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the Aegisub Group nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Aegisub Project http://www.aegisub.org/
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#pragma once
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#include <libaegisub/exception.h>
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#include <libaegisub/fs_fwd.h>
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#include <atomic>
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#include <vector>
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class AudioProvider {
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protected:
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int channels;
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/// for one channel, ie. number of PCM frames
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int64_t num_samples;
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std::atomic<int64_t> decoded_samples;
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int sample_rate;
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int bytes_per_sample;
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bool float_samples;
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virtual void FillBuffer(void *buf, int64_t start, int64_t count) const = 0;
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void ZeroFill(void *buf, int64_t count) const;
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public:
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virtual ~AudioProvider() = default;
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void GetAudio(void *buf, int64_t start, int64_t count) const;
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void GetAudioWithVolume(void *buf, int64_t start, int64_t count, double volume) const;
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int64_t GetNumSamples() const { return num_samples; }
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int64_t GetDecodedSamples() const { return decoded_samples; }
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int GetSampleRate() const { return sample_rate; }
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int GetBytesPerSample() const { return bytes_per_sample; }
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int GetChannels() const { return channels; }
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bool AreSamplesFloat() const { return float_samples; }
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/// @brief Does this provider benefit from external caching?
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virtual bool NeedsCache() const { return false; }
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};
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/// Helper base class for an audio provider which wraps another provider
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class AudioProviderWrapper : public AudioProvider {
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protected:
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std::unique_ptr<AudioProvider> source;
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public:
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AudioProviderWrapper(std::unique_ptr<AudioProvider> src)
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: source(std::move(src))
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{
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channels = source->GetChannels();
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num_samples = source->GetNumSamples();
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decoded_samples = source->GetDecodedSamples();
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sample_rate = source->GetSampleRate();
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bytes_per_sample = source->GetBytesPerSample();
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float_samples = source->AreSamplesFloat();
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}
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};
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namespace agi { class BackgroundRunner; }
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struct AudioProviderFactory {
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static std::vector<std::string> GetClasses();
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/// Get a provider for the file
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/// @param filename URI to open
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static std::unique_ptr<AudioProvider> GetProvider(agi::fs::path const& filename, agi::BackgroundRunner *br);
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};
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DEFINE_EXCEPTION(AudioProviderError, agi::Exception);
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/// Error of some sort occurred while decoding a frame
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DEFINE_EXCEPTION(AudioDecodeError, AudioProviderError);
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