海思解码库下载(包含库文件、头文件、文档以及官方测试程序和源码)
P/Invoke 调用处理：using System; using System.Runtime.InteropServices; namespace Demo { public class hi_h264dec { public const int HI_SUCCESS = 0; public const int HI_FAILURE = -1; public const int HI_LITTLE_ENDIAN = 1234; public const int HI_BIG_ENDIAN = 4321; public const int HI_DECODER_SLEEP_TIME = 60000; public const int HI_H264DEC_OK = 0; public const int HI_H264DEC_NEED_MORE_BITS = -1; public const int HI_H264DEC_NO_PICTURE = -2; public const int HI_H264DEC_ERR_HANDLE = -3; [DllImport("hi_h264dec_w.dll", EntryPoint = "Hi264DecImageEnhance", CallingConvention = CallingConvention.Cdecl)] public static extern int Hi264DecImageEnhance(IntPtr hDec, ref hiH264_DEC_FRAME_S pDecFrame, uint uEnhanceCoeff); [DllImport("hi_h264dec_w.dll", EntryPoint = "Hi264DecCreate", CallingConvention = CallingConvention.Cdecl)] public static extern IntPtr Hi264DecCreate(ref hiH264_DEC_ATTR_S pDecAttr); [DllImport("hi_h264dec_w.dll", EntryPoint = "Hi264DecDestroy", CallingConvention = CallingConvention.Cdecl)] public static extern void Hi264DecDestroy(IntPtr hDec); [DllImport("hi_h264dec_w.dll", EntryPoint = "Hi264DecGetInfo", CallingConvention = CallingConvention.Cdecl)] public static extern int Hi264DecGetInfo(ref hiH264_LIBINFO_S pLibInfo); [DllImport("hi_h264dec_w.dll", EntryPoint = "Hi264DecFrame", CallingConvention = CallingConvention.Cdecl)] public static extern int Hi264DecFrame(IntPtr hDec, IntPtr pStream, uint iStreamLen, ulong ullPTS, ref hiH264_DEC_FRAME_S pDecFrame, uint uFlags); [DllImport("hi_h264dec_w.dll", EntryPoint = "Hi264DecAU", CallingConvention = CallingConvention.Cdecl)] public static extern int Hi264DecAU(IntPtr hDec, IntPtr pStream, uint iStreamLen, ulong ullPTS, ref hiH264_DEC_FRAME_S pDecFrame, uint uFlags); [StructLayout(LayoutKind.Sequential)] public struct hiH264_DEC_ATTR_S { public uint uPictureFormat; public uint uStreamInType; public uint uPicWidthInMB; public uint uPicHeightInMB; public uint uBufNum; public uint uWorkMode; public IntPtr pUserData; public uint uReserved; } [StructLayout(LayoutKind.Sequential)] public struct hiH264_DEC_FRAME_S { public IntPtr pY; public IntPtr pU; public IntPtr pV; public uint uWidth; public uint uHeight; public uint uYStride; public uint uUVStride; public uint uCroppingLeftOffset; public uint uCroppingRightOffset; public uint uCroppingTopOffset; public uint uCroppingBottomOffset; public uint uDpbIdx; public uint uPicFlag; public uint bError; public uint bIntra; public ulong ullPTS; public uint uPictureID; public uint uReserved; public IntPtr pUserData; } [StructLayout(LayoutKind.Sequential)] public struct hiH264_LIBINFO_S { public uint uMajor; public uint uMinor; public uint uRelease; public uint uBuild; [MarshalAs(UnmanagedType.LPStr)] public string sVersion; [MarshalAs(UnmanagedType.LPStr)] public string sCopyRight; public uint uFunctionSet; public uint uPictureFormat; public uint uStreamInType; public uint uPicWidth; public uint uPicHeight; public uint uBufNum; public uint uReserved; } [StructLayout(LayoutKind.Sequential)] public struct hiH264_USERDATA_S { public uint uUserDataType; public uint uUserDataSize; public IntPtr pData; public IntPtr pNext; } } }View Code
解码的两种方式： 2.海思库解码分为两种方式:第一种，输入分断的码流数据进行解码第二种，输入一帧完整的码流数据进行解码 第一种方式的代码://初始化解码器，可以在 FormLoad 事件里完成 var decAttr = new hi_h264dec.hiH264_DEC_ATTR_S(); decAttr.uPictureFormat = 0; decAttr.uStreamInType = 0; decAttr.uPicWidthInMB = 480 >> 4; decAttr.uPicHeightInMB = 640 >> 4; decAttr.uBufNum = 8; decAttr.uWorkMode = 16; IntPtr _decHandle = hi_h264dec.Hi264DecCreate(ref decAttr); hi_h264dec.hiH264_DEC_FRAME_S _decodeFrame = new hi_h264dec.hiH264_DEC_FRAME_S(); //解码 //pData 为需要解码的 H264 nalu 数据，length 为该数据的长度 var resCode = hi_h264dec.Hi264DecFrame(_decHandle, pData, (uint)length, 0, ref _decodeFrame, 0); while (resCode != hi_h264dec.HI_H264DEC_NEED_MORE_BITS) { if (resCode == hi_h264dec.HI_H264DEC_OK) { if (_decodeFrame.bError == 0) { //计算 y u v 的长度 var yLength = _decodeFrame.uHeight * _decodeFrame.uYStride; var uLength = _decodeFrame.uHeight * _decodeFrame.uUVStride / 2; var vLength = uLength; var yBytes = new byte[yLength]; var uBytes = new byte[uLength]; var vBytes = new byte[vLength]; var decodedBytes = new byte[yLength uLength vLength]; //_decodeFrame 是解码后的数据对象，里面包含 YUV 数据、宽度、高度等信息 Marshal.Copy(_decodeFrame.pY, yBytes, 0, (int)yLength); Marshal.Copy(_decodeFrame.pU, uBytes, 0, (int)uLength); Marshal.Copy(_decodeFrame.pV, vBytes, 0, (int)vLength); //将从 _decodeFrame 中取出的 YUV 数据放入 decodedBytes 中 Array.Copy(yBytes, decodedBytes, yLength); Array.Copy(uBytes, 0, decodedBytes, yLength, uLength); Array.Copy(vBytes, 0, decodedBytes, yLength uLength, vLength); //decodedBytes 为yuv数据，可以将其转换为 RGB 数据后再转换为 BitMap 然后通过 PictureBox 控件即可显示 //这类代码网上比较常见，我就不贴了 } } resCode = hi_h264dec.Hi264DecFrame(_decHandle, IntPtr.Zero, 0, 0, ref _decodeFrame, 0); } //当所有解码操作完成后需要释放解码库，可以放在 FormClosing 事件里做 hi_h264dec.Hi264DecDestroy(_decHandle);View Code
第二种：//初始化解码器，可以在 FormLoad 事件里完成 var decAttr = new hi_h264dec.hiH264_DEC_ATTR_S(); decAttr.uPictureFormat = 0; decAttr.uStreamInType = 0; decAttr.uPicWidthInMB = 480 >> 4; decAttr.uPicHeightInMB = 640 >> 4; decAttr.uBufNum = 8; decAttr.uWorkMode = 16; IntPtr _decHandle = hi_h264dec.Hi264DecCreate(ref decAttr); hi_h264dec.hiH264_DEC_FRAME_S _decodeFrame = new hi_h264dec.hiH264_DEC_FRAME_S(); //解码 //pData 为需要解码的 H264 nalu 数据，length 为该数据的长度 if (hi_h264dec.Hi264DecAU(_decHandle, pData, (uint) length, 0, ref _decodeFrame, 0) == 0) { if (_decodeFrame.bError == 0) { //计算 y u v 的长度 var yLength = _decodeFrame.uHeight * _decodeFrame.uYStride; var uLength = _decodeFrame.uHeight * _decodeFrame.uUVStride / 2; var vLength = uLength; var yBytes = new byte[yLength]; var uBytes = new byte[uLength]; var vBytes = new byte[vLength]; var decodedBytes = new byte[yLength uLength vLength]; //_decodeFrame 是解码后的数据对象，里面包含 YUV 数据、宽度、高度等信息 Marshal.Copy(_decodeFrame.pY, yBytes, 0, (int)yLength); Marshal.Copy(_decodeFrame.pU, uBytes, 0, (int)uLength); Marshal.Copy(_decodeFrame.pV, vBytes, 0, (int)vLength); //将从 _decodeFrame 中取出的 YUV 数据放入 decodedBytes 中 Array.Copy(yBytes, decodedBytes, yLength); Array.Copy(uBytes, 0, decodedBytes, yLength, uLength); Array.Copy(vBytes, 0, decodedBytes, yLength uLength, vLength); //decodedBytes 为yuv数据，可以将其转换为 RGB 数据后再转换为 BitMap 然后通过 PictureBox 控件即可显示 //这类代码网上比较常见，我就不贴了 } } //当所有解码操作完成后需要释放解码库，可以放在 FormClosing 事件里做 hi_h264dec.Hi264DecDestroy(_decHandle);View Code
对于在设备 SDK 回调里每次都能获取到一帧完整的 H264 裸数据时，建议使用第二种方式。而对于读取文件进行本地播放时，建议使用第一种方式。 另外，需要注意海思解码库为商业软件，在解码输出时，画面中会包含海思公司水印，自己想办法去除吧。：
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