Libraries: Move to Userland/Libraries/

Author: https://github.com/awesomekling
Commit: 13d7c09125

Userland/Libraries/LibAudio/Loader.h

@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2018-2020, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/ByteBuffer.h>
+#include <AK/RefCounted.h>
+#include <AK/RefPtr.h>
+#include <AK/StringView.h>
+#include <LibCore/File.h>
+
+namespace Audio {
+
+class LoaderPlugin {
+public:
+    virtual ~LoaderPlugin() { }
+
+    virtual bool sniff() = 0;
+
+    virtual bool has_error() { return false; }
+    virtual const char* error_string() { return ""; }
+
+    virtual RefPtr<Buffer> get_more_samples(size_t max_bytes_to_read_from_input = 128 * KiB) = 0;
+
+    virtual void reset() = 0;
+    virtual void seek(const int position) = 0;
+
+    virtual int loaded_samples() = 0;
+    virtual int total_samples() = 0;
+    virtual u32 sample_rate() = 0;
+    virtual u16 num_channels() = 0;
+    virtual u16 bits_per_sample() = 0;
+    virtual RefPtr<Core::File> file() = 0;
+};
+
+class Loader : public RefCounted<Loader> {
+public:
+    static NonnullRefPtr<Loader> create(const StringView& path) { return adopt(*new Loader(path)); }
+    static NonnullRefPtr<Loader> create(const ByteBuffer& buffer) { return adopt(*new Loader(buffer)); }
+
+    bool has_error() const { return m_plugin ? m_plugin->has_error() : true; }
+    const char* error_string() const { return m_plugin ? m_plugin->error_string() : "No loader plugin available"; }
+
+    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; }
+
+    void reset() const
+    {
+        if (m_plugin)
+            m_plugin->reset();
+    }
+    void seek(const int position) const
+    {
+        if (m_plugin)
+            m_plugin->seek(position);
+    }
+
+    int loaded_samples() const { return m_plugin ? m_plugin->loaded_samples() : 0; }
+    int total_samples() const { return m_plugin ? m_plugin->total_samples() : 0; }
+    u32 sample_rate() const { return m_plugin ? m_plugin->sample_rate() : 0; }
+    u16 num_channels() const { return m_plugin ? m_plugin->num_channels() : 0; }
+    u16 bits_per_sample() const { return m_plugin ? m_plugin->bits_per_sample() : 0; }
+    RefPtr<Core::File> file() const { return m_plugin ? m_plugin->file() : nullptr; }
+
+private:
+    Loader(const StringView& path);
+    Loader(const ByteBuffer& buffer);
+
+    mutable OwnPtr<LoaderPlugin> m_plugin;
+};
+
+}