public byte[] Encode(byte[] frame, VpxImgFmt inputPixelFormat = VpxImgFmt.VPX_IMG_FMT_I420, bool forceKeyFrame = false)
{
if (!_isVpxImageAllocated)
{
_isVpxImageAllocated = true;
VpxImage.VpxImgAlloc(_vpxEncodeImg, inputPixelFormat, _encodeWidth, _encodeHeight, 1);
}
byte[] encodedSample = null;
unsafe
{
fixed(byte *pFrame = frame)
{
VpxImage.VpxImgWrap(_vpxEncodeImg, inputPixelFormat, _encodeWidth, _encodeHeight, 1, pFrame);
int flags = (forceKeyFrame) ? VPX_EFLAG_FORCE_KF : 0;
var encodeRes = vpx_encoder.VpxCodecEncode(_vpxEncodeCtx, _vpxEncodeImg, 1, 1, flags, VPX_DL_REALTIME);
if (encodeRes != VpxCodecErrT.VPX_CODEC_OK)
{
throw new ApplicationException($"VP8 encode attempt failed, {vpx_codec.VpxCodecErrToString(encodeRes)}.");
}
IntPtr iter = IntPtr.Zero;
var pkt = vpx_encoder.VpxCodecGetCxData(_vpxEncodeCtx, (void **)&iter);
while (pkt != null)
{
switch (pkt.Kind)
{
case VpxCodecCxPktKind.VPX_CODEC_CX_FRAME_PKT:
//Console.WriteLine($"is key frame={(pkt.data.frame.Flags & VPX_FRAME_IS_KEY) > 0}, length {pkt.data.Raw.Sz}.");
encodedSample = new byte[pkt.data.Raw.Sz];
Marshal.Copy(pkt.data.Raw.Buf, encodedSample, 0, encodedSample.Length);
break;
default:
throw new ApplicationException($"Unexpected packet type received from encoder, {pkt.Kind}.");
}
pkt = vpx_encoder.VpxCodecGetCxData(_vpxEncodeCtx, (void **)&iter);
}
}
}
return(encodedSample);
}
// Setting config parameters in Chromium source.
// https://chromium.googlesource.com/external/webrtc/stable/src/+/b8671cb0516ec9f6c7fe22a6bbe331d5b091cdbb/modules/video_coding/codecs/vp8/vp8.cc
// Updated link 15 Jun 2020.
// https://chromium.googlesource.com/external/webrtc/stable/src/+/refs/heads/master/modules/video_coding/codecs/vp8/vp8_impl.cc
public void InitialiseEncoder(uint width, uint height)
{
_encodeWidth = width;
_encodeHeight = height;
_vpxEncodeCtx = new VpxCodecCtx();
_vpxEncodeImg = new VpxImage();
VpxCodecEncCfg vp8EncoderCfg = new VpxCodecEncCfg();
var setConfigRes = vpx_encoder.VpxCodecEncConfigDefault(vp8cx.VpxCodecVp8Cx(), vp8EncoderCfg, 0);
if (setConfigRes != VpxCodecErrT.VPX_CODEC_OK)
{
throw new ApplicationException($"Failed to set VP8 encoder configuration to default values, {setConfigRes}.");
}
vp8EncoderCfg.GW = _encodeWidth;
vp8EncoderCfg.GH = _encodeHeight;
// vpxConfig.g_w = width;
// vpxConfig.g_h = height;
// vpxConfig.rc_target_bitrate = _rc_target_bitrate;// 300; // 5000; // in kbps.
// vpxConfig.rc_min_quantizer = _rc_min_quantizer;// 20; // 50;
// vpxConfig.rc_max_quantizer = _rc_max_quantizer;// 30; // 60;
// vpxConfig.g_pass = VPX_RC_ONE_PASS;
// if (_rc_is_cbr)
// {
// vpxConfig.rc_end_usage = VPX_CBR;
// }
// else
// {
// vpxConfig.rc_end_usage = VPX_VBR;
// }
// vpxConfig.g_error_resilient = VPX_ERROR_RESILIENT_DEFAULT;
// vpxConfig.g_lag_in_frames = 0;
// vpxConfig.rc_resize_allowed = 0;
// vpxConfig.kf_max_dist = 20;
var initEncoderRes = vpx_encoder.VpxCodecEncInitVer(_vpxEncodeCtx, vp8cx.VpxCodecVp8Cx(), vp8EncoderCfg, 0, VPX_ENCODER_ABI_VERSION);
if (initEncoderRes != VpxCodecErrT.VPX_CODEC_OK)
{
throw new ApplicationException($"Failed to initialise VP8 encoder, {vpx_codec.VpxCodecErrToString(initEncoderRes)}.");
}
//VpxImage.VpxImgAlloc(_vpxEncodeImg, VpxImgFmt.VPX_IMG_FMT_I420, _encodeWidth, _encodeHeight, 1);
VpxImage.VpxImgAlloc(_vpxEncodeImg, VpxImgFmt.VPX_IMG_FMT_NV12, _encodeWidth, _encodeHeight, 1);
}