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/* Theorafile# - C# Wrapper for Theorafile
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*
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* Copyright (c) 2017-2020 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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#region Using Statements
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using System;
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using System.Runtime.InteropServices;
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using System.Text;
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#endregion
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public static class Theorafile
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{
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#region Native Library Name
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const string nativeLibName = "libtheorafile";
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#endregion
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#region UTF8 Marshaling
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/* Used for heap allocated string marshaling
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* Returned byte* must be free'd with FreeHGlobal.
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*/
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private static unsafe byte* Utf8Encode(string str)
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{
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int bufferSize = (str.Length * 4) + 1;
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byte* buffer = (byte*) Marshal.AllocHGlobal(bufferSize);
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fixed (char* strPtr = str)
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{
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Encoding.UTF8.GetBytes(
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strPtr,
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str.Length + 1,
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buffer,
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bufferSize
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);
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}
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return buffer;
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}
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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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// Add TF_ prefix to prevent C macro conflicts
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TF_SEEK_SET = 0,
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TF_SEEK_CUR = 1,
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TF_SEEK_END = 2
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}
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#endregion
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#region Theorafile 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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#endregion
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#region libtheora Enumerations
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public enum th_pixel_fmt
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{
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TH_PF_420,
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TH_PF_RSVD,
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TH_PF_422,
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TH_PF_444,
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TH_PF_NFORMATS
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}
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#endregion
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#region Theorafile Structures
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[StructLayout(LayoutKind.Sequential)]
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public struct tf_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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}
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#endregion
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#region Theorafile Implementation
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[DllImport(nativeLibName, EntryPoint = "tf_open_callbacks", CallingConvention = CallingConvention.Cdecl)]
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private static extern int INTERNAL_tf_open_callbacks(
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IntPtr datasource,
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IntPtr file,
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tf_callbacks io
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);
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public static int tf_open_callbacks(
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IntPtr datasource,
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out IntPtr file,
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tf_callbacks io
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) {
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file = AllocTheoraFile();
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return INTERNAL_tf_open_callbacks(datasource, file, io);
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}
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[DllImport(nativeLibName, EntryPoint = "tf_fopen", CallingConvention = CallingConvention.Cdecl)]
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private static extern unsafe int INTERNAL_tf_fopen(
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byte* fname,
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IntPtr file
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);
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public static unsafe int tf_fopen(string fname, out IntPtr file)
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{
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file = AllocTheoraFile();
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byte* utf8Fname = Utf8Encode(fname);
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int result = INTERNAL_tf_fopen(utf8Fname, file);
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Marshal.FreeHGlobal((IntPtr) utf8Fname);
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return result;
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}
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[DllImport(nativeLibName, EntryPoint = "tf_close", CallingConvention = CallingConvention.Cdecl)]
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private static extern int INTERNAL_tf_close(IntPtr file);
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public static int tf_close(ref IntPtr file)
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{
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int result = INTERNAL_tf_close(file);
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Marshal.FreeHGlobal(file);
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file = IntPtr.Zero;
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return result;
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}
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[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
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public static extern int tf_hasaudio(IntPtr file);
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[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
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public static extern int tf_hasvideo(IntPtr file);
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[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
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public static extern void tf_videoinfo(
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IntPtr file,
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out int width,
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out int height,
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out double fps,
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out th_pixel_fmt fmt
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);
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[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
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public static extern void tf_audioinfo(
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IntPtr file,
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out int channels,
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out int samplerate
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);
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[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
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public static extern int tf_eos(IntPtr file);
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[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
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public static extern void tf_reset(IntPtr file);
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[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
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public static extern int tf_readvideo(IntPtr file, IntPtr buffer, int numframes);
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[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]
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public static extern int tf_readaudio(IntPtr file, IntPtr buffer, int length);
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#endregion
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#region OggTheora_File Allocator
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/* Notice that we did not implement an OggTheora_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 Xiph 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(OggTheora_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 AllocTheoraFile()
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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 = 1160;
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const int size64Unix = 1472;
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const int size64Windows = 1328;
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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 a little bit smaller, 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 Marshal.AllocHGlobal(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 Marshal.AllocHGlobal(size64Unix);
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}
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else if (platform == PlatformID.Win32NT)
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{
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return Marshal.AllocHGlobal(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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