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Commit Description:
Various UI improvements.
Commit Description:
Various UI improvements.
References:
r291:6a7d5e8510b1 default
File last commit:
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FNA/lib/Theorafile/csharp/Theorafile.cs
253 lines | 6.5 KiB | text/x-csharp | CSharpLexer
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alys
Early working version (including all dependencies, lol).
 r0 /* Theorafile# - C# Wrapper for Theorafile
*
* Copyright (c) 2017-2020 Ethan Lee.
*
* This software is provided 'as-is', without any express or implied warranty.
* In no event will the authors be held liable for any damages arising from
* the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software in a
* product, an acknowledgment in the product documentation would be
* appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*
* Ethan "flibitijibibo" Lee <flibitijibibo@flibitijibibo.com>
*
*/
#region Using Statements
using System;
using System.Runtime.InteropServices;
using System.Text;
#endregion
public static class Theorafile
{
#region Native Library Name
const string nativeLibName = "libtheorafile";
#endregion
#region UTF8 Marshaling
/* Used for heap allocated string marshaling
* Returned byte* must be free'd with FreeHGlobal.
*/
private static unsafe byte* Utf8Encode(string str)
{
int bufferSize = (str.Length * 4) + 1;
byte* buffer = (byte*) Marshal.AllocHGlobal(bufferSize);
fixed (char* strPtr = str)
{
Encoding.UTF8.GetBytes(
strPtr,
str.Length + 1,
buffer,
bufferSize
);
}
return buffer;
}
#endregion
#region C stdio Macros
// Used by ov_callbacks, seek_func
public enum SeekWhence : int
{
// Add TF_ prefix to prevent C macro conflicts
TF_SEEK_SET = 0,
TF_SEEK_CUR = 1,
TF_SEEK_END = 2
}
#endregion
#region Theorafile Delegates
/* IntPtr refers to a size_t */
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate IntPtr read_func(
IntPtr ptr, // Refers to a void*
IntPtr size, // Refers to a size_t
IntPtr nmemb, // Refers to a size_t
IntPtr datasource // Refers to a void*
);
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate int seek_func(
IntPtr datasource, // Refers to a void*
long offset, // Refers to an ogg_int64_t
SeekWhence whence
);
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate int close_func(
IntPtr datasource // Refers to a void*
);
#endregion
#region libtheora Enumerations
public enum th_pixel_fmt
{
TH_PF_420,
TH_PF_RSVD,
TH_PF_422,
TH_PF_444,
TH_PF_NFORMATS
}
#endregion
#region Theorafile Structures
[StructLayout(LayoutKind.Sequential)]
public struct tf_callbacks
{
public read_func read_func;
public seek_func seek_func;
public close_func close_func;
}
#endregion
#region Theorafile Implementation
[DllImport(nativeLibName, EntryPoint = "tf_open_callbacks", CallingConvention = CallingConvention.Cdecl)]
private static extern int INTERNAL_tf_open_callbacks(
IntPtr datasource,
IntPtr file,
tf_callbacks io
);
public static int tf_open_callbacks(
IntPtr datasource,
out IntPtr file,
tf_callbacks io
) {
file = AllocTheoraFile();
return INTERNAL_tf_open_callbacks(datasource, file, io);
}
[DllImport(nativeLibName, EntryPoint = "tf_fopen", CallingConvention = CallingConvention.Cdecl)]
private static extern unsafe int INTERNAL_tf_fopen(
byte* fname,
IntPtr file
);
public static unsafe int tf_fopen(string fname, out IntPtr file)
{
file = AllocTheoraFile();
byte* utf8Fname = Utf8Encode(fname);
int result = INTERNAL_tf_fopen(utf8Fname, file);
Marshal.FreeHGlobal((IntPtr) utf8Fname);
return result;
}
[DllImport(nativeLibName, EntryPoint = "tf_close", CallingConvention = CallingConvention.Cdecl)]
private static extern int INTERNAL_tf_close(IntPtr file);
public static int tf_close(ref IntPtr file)
{
int result = INTERNAL_tf_close(file);
Marshal.FreeHGlobal(file);
file = IntPtr.Zero;
return result;
}
[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
public static extern int tf_hasaudio(IntPtr file);
[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
public static extern int tf_hasvideo(IntPtr file);
[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
public static extern void tf_videoinfo(
IntPtr file,
out int width,
out int height,
out double fps,
out th_pixel_fmt fmt
);
[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
public static extern void tf_audioinfo(
IntPtr file,
out int channels,
out int samplerate
);
[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
public static extern int tf_eos(IntPtr file);
[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
public static extern void tf_reset(IntPtr file);
[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
public static extern int tf_readvideo(IntPtr file, IntPtr buffer, int numframes);
[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
public static extern int tf_readaudio(IntPtr file, IntPtr buffer, int length);
#endregion
#region OggTheora_File Allocator
/* Notice that we did not implement an OggTheora_File struct, but are
* instead using a pointer natively malloc'd.
*
* C# Interop for Xiph structs is basically impossible to do, so
* we just alloc what _should_ be the full size of the structure for
* the OS and architecture, then pass that around as if that's a real
* struct. The size is just what you get from sizeof(OggTheora_File).
*
* Don't get mad at me, get mad at C#.
*
* -flibit
*/
private static IntPtr AllocTheoraFile()
{
// Do not attempt to understand these numbers at all costs!
const int size32 = 1160;
const int size64Unix = 1472;
const int size64Windows = 1328;
PlatformID platform = Environment.OSVersion.Platform;
if (IntPtr.Size == 4)
{
/* Technically this could be a little bit smaller, but
* some 32-bit architectures may be higher even on Unix
* targets (like ARMv7).
* -flibit
*/
return Marshal.AllocHGlobal(size32);
}
if (IntPtr.Size == 8)
{
if (platform == PlatformID.Unix)
{
return Marshal.AllocHGlobal(size64Unix);
}
else if (platform == PlatformID.Win32NT)
{
return Marshal.AllocHGlobal(size64Windows);
}
throw new NotSupportedException("Unhandled platform!");
}
throw new NotSupportedException("Unhandled architecture!");
}
#endregion
}