296 lines
7.7 KiB
C#
296 lines
7.7 KiB
C#
#region License
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/* Vorbisfile# - C# Wrapper for Vorbisfile
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*
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* Copyright (c) 2013-2015 Ethan Lee.
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*
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* This software is provided 'as-is', without any express or implied warranty.
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* In no event will the authors be held liable for any damages arising from
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* the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software in a
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* product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source distribution.
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*
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* Ethan "flibitijibibo" Lee <flibitijibibo@flibitijibibo.com>
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*
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*/
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#endregion
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#region Using Statements
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using System;
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using System.Runtime.InteropServices;
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#endregion
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public static class Vorbisfile
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{
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#region Native Library Name
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private const string nativeLibName = "libvorbisfile.dll";
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#endregion
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#region malloc/free Entry Points
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// Yes, we're seriously using these. -flibit
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[DllImport("msvcrt.dll", CallingConvention = CallingConvention.Cdecl)]
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private static extern IntPtr malloc(IntPtr size);
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[DllImport("msvcrt.dll", CallingConvention = CallingConvention.Cdecl)]
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private static extern void free(IntPtr memblock);
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#endregion
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#region C stdio Macros
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// Used by ov_callbacks, seek_func
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public enum SeekWhence : int
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{
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SEEK_SET = 0,
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SEEK_CUR = 1,
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SEEK_END = 2
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}
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#endregion
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#region Vorbis Delegates
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/* IntPtr refers to a size_t */
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[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
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public delegate IntPtr read_func(
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IntPtr ptr, // Refers to a void*
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IntPtr size, // Refers to a size_t
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IntPtr nmemb, // Refers to a size_t
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IntPtr datasource // Refers to a void*
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);
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[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
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public delegate int seek_func(
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IntPtr datasource, // Refers to a void*
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long offset, // Refers to an ogg_int64_t
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SeekWhence whence
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);
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[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
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public delegate int close_func(
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IntPtr datasource // Refers to a void*
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);
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/* IntPtr refers to a long, ignoring Win64! */
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[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
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public delegate IntPtr tell_func(
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IntPtr datasource // Refers to a void*
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);
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#endregion
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#region Vorbis Structures
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[StructLayout(LayoutKind.Sequential)]
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public struct vorbis_info
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{
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public int version;
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public int channels;
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public IntPtr rate; // refers to a long, ignoring Win64!
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public IntPtr bitrate_upper; // refers to a long, ignoring Win64!
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public IntPtr bitrate_nominal; // refers to a long, ignoring Win64!
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public IntPtr bitrate_lower; // refers to a long, ignoring Win64!
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public IntPtr bitrate_window; // refers to a long, ignoring Win64!
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public IntPtr codec_setup; // Refers to a void*
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}
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[StructLayout(LayoutKind.Sequential)]
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public struct vorbis_comment
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{
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public IntPtr user_comments; // Refers to a char**
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public IntPtr comment_lengths; // Refers to an int*
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public int comments;
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public IntPtr vendor; // Refers to a char*
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}
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[StructLayout(LayoutKind.Sequential)]
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public struct ov_callbacks
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{
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public read_func read_func;
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public seek_func seek_func;
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public close_func close_func;
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public tell_func tell_func;
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}
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#endregion
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#region Vorbisfile Implementation
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[DllImport(nativeLibName, EntryPoint = "ov_fopen", CallingConvention = CallingConvention.Cdecl)]
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private static extern int INTERNAL_ov_fopen(
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[In()] [MarshalAs(UnmanagedType.LPStr)]
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string path,
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IntPtr vf
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);
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public static int ov_fopen(string path, out IntPtr vf)
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{
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vf = AllocVorbisFile();
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return INTERNAL_ov_fopen(path, vf);
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}
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[DllImport(nativeLibName, EntryPoint = "ov_open_callbacks", CallingConvention = CallingConvention.Cdecl)]
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private static extern int INTERNAL_ov_open_callbacks(
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IntPtr datasource,
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IntPtr vf,
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IntPtr initial,
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IntPtr ibytes,
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ov_callbacks callbacks
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);
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public static int ov_open_callbacks(
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IntPtr datasource, // Refers to a void*
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out IntPtr vf,
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IntPtr initial, // Refers to a char*
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IntPtr ibytes, // Refers to a long, ignoring Win64!
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ov_callbacks callbacks
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) {
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vf = AllocVorbisFile();
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return INTERNAL_ov_open_callbacks(
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datasource,
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vf,
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initial,
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ibytes,
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callbacks
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);
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}
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[DllImport(nativeLibName, EntryPoint = "ov_info", CallingConvention = CallingConvention.Cdecl)]
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private static extern IntPtr INTERNAL_ov_info(
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IntPtr vf,
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int link
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);
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public static vorbis_info ov_info(
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IntPtr vf,
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int link
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) {
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IntPtr result = INTERNAL_ov_info(vf, link);
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vorbis_info info = (vorbis_info) Marshal.PtrToStructure(
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result,
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typeof(vorbis_info)
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);
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return info;
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}
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[DllImport(nativeLibName, EntryPoint = "ov_comment", CallingConvention = CallingConvention.Cdecl)]
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private static extern IntPtr INTERNAL_ov_comment(
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IntPtr vf,
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int link
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);
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public static vorbis_comment ov_comment(
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IntPtr vf,
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int link
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) {
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IntPtr result = INTERNAL_ov_comment(vf, link);
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vorbis_comment comment = (vorbis_comment) Marshal.PtrToStructure(
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result,
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typeof(vorbis_comment)
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);
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return comment;
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}
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[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
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public static extern double ov_time_total(IntPtr vf, int i);
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/* IntPtr refers to a long, ignoring Win64! */
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[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
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public static extern IntPtr ov_read(
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IntPtr vf,
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byte[] buffer,
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int length,
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int bigendianp,
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int word,
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int sgned,
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out int current_section
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);
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/* IntPtr refers to a long, ignoring Win64! */
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[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
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public static extern IntPtr ov_read(
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IntPtr vf,
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IntPtr buffer,
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int length,
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int bigendianp,
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int word,
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int sgned,
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out int current_section
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);
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[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
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public static extern int ov_time_seek(IntPtr vf, double s);
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[DllImport(nativeLibName, EntryPoint = "ov_clear", CallingConvention = CallingConvention.Cdecl)]
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private static extern int INTERNAL_ov_clear(IntPtr vf);
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public static int ov_clear(ref IntPtr vf)
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{
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int result = INTERNAL_ov_clear(vf);
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free(vf);
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vf = IntPtr.Zero;
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return result;
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}
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#endregion
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#region OggVorbis_File Allocator
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/* Notice that we did not implement an OggVorbis_File struct, but are
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* instead using a pointer natively malloc'd.
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*
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* C# Interop for Vorbisfile structs is basically impossible to do, so
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* we just alloc what _should_ be the full size of the structure for
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* the OS and architecture, then pass that around as if that's a real
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* struct. The size is just what you get from sizeof(OggVorbis_File).
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*
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* Don't get mad at me, get mad at C#.
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*
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* -flibit
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*/
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private static IntPtr AllocVorbisFile()
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{
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// Do not attempt to understand these numbers at all costs!
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const int size32 = 720;
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const int size64Unix = 944;
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const int size64Windows = 840;
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PlatformID platform = Environment.OSVersion.Platform;
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if (IntPtr.Size == 4)
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{
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/* Technically this could be as low as 704 bytes, but
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* some 32-bit architectures may be higher even on Unix
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* targets (like ARMv7).
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* -flibit
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*/
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return malloc((IntPtr) size32);
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}
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if (IntPtr.Size == 8)
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{
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if (platform == PlatformID.Unix)
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{
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return malloc((IntPtr) size64Unix);
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}
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else if (platform == PlatformID.Win32NT)
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{
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return malloc((IntPtr) size64Windows);
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}
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throw new NotSupportedException("Unhandled platform!");
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}
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throw new NotSupportedException("Unhandled architecture!");
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}
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#endregion
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}
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