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https://github.com/RGBCube/serenity
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LibAudio: Add generic Audio::Loader class
The Audio::Loader class is able to load different types of audio files by using a generic plugin interface for all file formats. Every new loader will have to derive from Audio::LoaderPlugin to provide a common API. This makes it easy to add support for more audio file formats in the future.
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5 changed files with 161 additions and 19 deletions
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@ -1,5 +1,6 @@
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set(SOURCES
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ClientConnection.cpp
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Loader.cpp
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WavLoader.cpp
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WavWriter.cpp
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)
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39
Libraries/LibAudio/Loader.cpp
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39
Libraries/LibAudio/Loader.cpp
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/*
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* Copyright (c) 2018-2020, the SerenityOS developers.
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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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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. 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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*
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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 ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibAudio/WavLoader.h>
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namespace Audio {
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Loader::Loader(const StringView& path)
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{
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m_plugin = make<WavLoaderPlugin>(path);
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if (m_plugin->sniff())
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return;
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m_plugin = nullptr;
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}
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}
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91
Libraries/LibAudio/Loader.h
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91
Libraries/LibAudio/Loader.h
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/*
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* Copyright (c) 2018-2020, the SerenityOS developers.
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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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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. 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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*
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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 ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/StringView.h>
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#include <LibCore/File.h>
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namespace Audio {
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class LoaderPlugin {
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public:
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virtual ~LoaderPlugin() { }
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virtual bool sniff() = 0;
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virtual bool has_error() { return false; }
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virtual const char* error_string() { return ""; }
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virtual RefPtr<Buffer> get_more_samples(size_t max_bytes_to_read_from_input = 128 * KiB) = 0;
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virtual void reset() = 0;
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virtual void seek(const int position) = 0;
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virtual int loaded_samples() = 0;
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virtual int total_samples() = 0;
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virtual u32 sample_rate() = 0;
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virtual u16 num_channels() = 0;
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virtual u16 bits_per_sample() = 0;
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virtual RefPtr<Core::File> file() = 0;
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};
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class Loader : public RefCounted<Loader> {
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public:
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static NonnullRefPtr<Loader> create(const StringView& path) { return adopt(*new Loader(path)); }
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bool has_error() const { return m_plugin ? m_plugin->has_error() : true; }
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const char* error_string() const { return m_plugin ? m_plugin->error_string() : "No loader plugin available"; }
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RefPtr<Buffer> get_more_samples(size_t max_bytes_to_read_from_input = 128 * KiB) const { return m_plugin ? m_plugin->get_more_samples(max_bytes_to_read_from_input) : nullptr; }
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void reset() const
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{
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if (m_plugin)
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m_plugin->reset();
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}
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void seek(const int position) const
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{
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if (m_plugin)
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m_plugin->seek(position);
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}
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int loaded_samples() const { return m_plugin ? m_plugin->loaded_samples() : 0; }
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int total_samples() const { return m_plugin ? m_plugin->total_samples() : 0; }
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u32 sample_rate() const { return m_plugin ? m_plugin->sample_rate() : 0; }
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u16 num_channels() const { return m_plugin ? m_plugin->num_channels() : 0; }
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u16 bits_per_sample() const { return m_plugin ? m_plugin->bits_per_sample() : 0; }
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RefPtr<Core::File> file() const { return m_plugin ? m_plugin->file() : nullptr; }
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private:
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Loader(const StringView& path);
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mutable OwnPtr<LoaderPlugin> m_plugin;
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};
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}
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@ -33,7 +33,7 @@
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namespace Audio {
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WavLoader::WavLoader(const StringView& path)
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WavLoaderPlugin::WavLoaderPlugin(const StringView& path)
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: m_file(Core::File::construct(path))
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{
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if (!m_file->open(Core::IODevice::ReadOnly)) {
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return;
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}
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if (!parse_header())
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valid = parse_header();
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if (!valid)
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return;
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m_resampler = make<ResampleHelper>(m_sample_rate, 44100);
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}
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RefPtr<Buffer> WavLoader::get_more_samples(size_t max_bytes_to_read_from_input)
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bool WavLoaderPlugin::sniff()
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{
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return valid;
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}
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RefPtr<Buffer> WavLoaderPlugin::get_more_samples(size_t max_bytes_to_read_from_input)
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{
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#ifdef AWAVLOADER_DEBUG
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dbgln("Read WAV of format PCM with num_channels {} sample rate {}, bits per sample {}", m_num_channels, m_sample_rate, m_bits_per_sample);
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return buffer;
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}
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void WavLoader::seek(const int position)
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void WavLoaderPlugin::seek(const int position)
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{
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if (position < 0 || position > m_total_samples)
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return;
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m_file->seek(position * m_num_channels * (m_bits_per_sample / 8));
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}
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void WavLoader::reset()
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void WavLoaderPlugin::reset()
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{
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seek(0);
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}
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bool WavLoader::parse_header()
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bool WavLoaderPlugin::parse_header()
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{
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Core::IODeviceStreamReader stream(*m_file);
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#include <AK/String.h>
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#include <AK/StringView.h>
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#include <LibAudio/Buffer.h>
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#include <LibAudio/Loader.h>
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#include <LibCore/File.h>
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namespace Audio {
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class Buffer;
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// Parses a WAV file and produces an Audio::Buffer.
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class WavLoader {
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class WavLoaderPlugin : public LoaderPlugin {
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public:
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explicit WavLoader(const StringView& path);
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explicit WavLoaderPlugin(const StringView& path);
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bool has_error() const { return !m_error_string.is_null(); }
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const char* error_string() { return m_error_string.characters(); }
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virtual bool sniff() override;
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RefPtr<Buffer> get_more_samples(size_t max_bytes_to_read_from_input = 128 * KiB);
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virtual bool has_error() override { return !m_error_string.is_null(); }
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virtual const char* error_string() override { return m_error_string.characters(); }
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void reset();
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void seek(const int position);
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virtual RefPtr<Buffer> get_more_samples(size_t max_bytes_to_read_from_input = 128 * KiB) override;
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int loaded_samples() const { return m_loaded_samples; }
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int total_samples() const { return m_total_samples; }
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u32 sample_rate() const { return m_sample_rate; }
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u16 num_channels() const { return m_num_channels; }
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u16 bits_per_sample() const { return m_bits_per_sample; }
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RefPtr<Core::File> file() const { return m_file; }
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virtual void reset() override;
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virtual void seek(const int position) override;
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virtual int loaded_samples() override { return m_loaded_samples; }
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virtual int total_samples() override { return m_total_samples; }
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virtual u32 sample_rate() override { return m_sample_rate; }
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virtual u16 num_channels() override { return m_num_channels; }
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virtual u16 bits_per_sample() override { return m_bits_per_sample; }
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virtual RefPtr<Core::File> file() override { return m_file; }
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private:
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bool parse_header();
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bool valid { false };
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RefPtr<Core::File> m_file;
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String m_error_string;
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OwnPtr<ResampleHelper> m_resampler;
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