239 lines
6.3 KiB
C#
239 lines
6.3 KiB
C#
/* Theorafile# - C# Wrapper for Theorafile
|
|
*
|
|
* Copyright (c) 2017 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;
|
|
#endregion
|
|
|
|
public static class Theorafile
|
|
{
|
|
#region Native Library Name
|
|
|
|
const string nativeLibName = "libtheorafile.dll";
|
|
|
|
#endregion
|
|
|
|
#region UTF8 Marshaling
|
|
|
|
private static byte[] UTF8_ToNative(string s)
|
|
{
|
|
if (s == null)
|
|
{
|
|
return null;
|
|
}
|
|
|
|
// Add a null terminator. That's kind of it... :/
|
|
return System.Text.Encoding.UTF8.GetBytes(s + '\0');
|
|
}
|
|
|
|
#endregion
|
|
|
|
#region malloc/free Entry Points
|
|
|
|
// Yes, we're seriously using these. -flibit
|
|
|
|
[DllImport("msvcrt.dll", CallingConvention = CallingConvention.Cdecl)]
|
|
private static extern IntPtr malloc(IntPtr size);
|
|
|
|
[DllImport("msvcrt.dll", CallingConvention = CallingConvention.Cdecl)]
|
|
private static extern void free(IntPtr memblock);
|
|
|
|
#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 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 int INTERNAL_tf_fopen(
|
|
byte[] fname,
|
|
IntPtr file
|
|
);
|
|
public static int tf_fopen(string fname, out IntPtr file)
|
|
{
|
|
file = AllocTheoraFile();
|
|
return INTERNAL_tf_fopen(UTF8_ToNative(fname), file);
|
|
}
|
|
|
|
[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);
|
|
free(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
|
|
);
|
|
|
|
[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 malloc((IntPtr) size32);
|
|
}
|
|
if (IntPtr.Size == 8)
|
|
{
|
|
if (platform == PlatformID.Unix)
|
|
{
|
|
return malloc((IntPtr) size64Unix);
|
|
}
|
|
else if (platform == PlatformID.Win32NT)
|
|
{
|
|
return malloc((IntPtr) size64Windows);
|
|
}
|
|
throw new NotSupportedException("Unhandled platform!");
|
|
}
|
|
throw new NotSupportedException("Unhandled architecture!");
|
|
}
|
|
|
|
#endregion
|
|
}
|