/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * Video Optimized Remoting Virtual Channel Extension
 *
 * Copyright 2017 David Fort <contact@hardening-consulting.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <freerdp/config.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <winpr/crt.h>
#include <winpr/assert.h>
#include <winpr/cast.h>
#include <winpr/synch.h>
#include <winpr/print.h>
#include <winpr/stream.h>
#include <winpr/cmdline.h>
#include <winpr/collections.h>
#include <winpr/interlocked.h>
#include <winpr/sysinfo.h>

#include <freerdp/addin.h>
#include <freerdp/primitives.h>
#include <freerdp/client/channels.h>
#include <freerdp/client/geometry.h>
#include <freerdp/client/video.h>
#include <freerdp/channels/log.h>
#include <freerdp/codec/h264.h>
#include <freerdp/codec/yuv.h>
#include <freerdp/timer.h>

#define TAG CHANNELS_TAG("video.client")

#include "video_main.h"

typedef struct
{
	IWTSPlugin wtsPlugin;

	IWTSListener* controlListener;
	IWTSListener* dataListener;
	GENERIC_LISTENER_CALLBACK* control_callback;
	GENERIC_LISTENER_CALLBACK* data_callback;

	VideoClientContext* context;
	BOOL initialized;
	rdpContext* rdpcontext;
} VIDEO_PLUGIN;

#define XF_VIDEO_UNLIMITED_RATE 31

static const BYTE MFVideoFormat_H264[] = { 'H',  '2',  '6',  '4',  0x00, 0x00, 0x10, 0x00,
	                                       0x80, 0x00, 0x00, 0xAA, 0x00, 0x38, 0x9B, 0x71 };

typedef struct
{
	BYTE PresentationId;
	UINT32 ScaledWidth;
	UINT32 ScaledHeight;

	UINT64 startTimeStamp;
	UINT64 publishOffset;
	wStream* currentSample;
	UINT64 lastPublishTime;
	UINT64 nextPublishTime;
	volatile LONG refCounter;
	H264_CONTEXT* h264;
	VideoSurface* surface;
	MAPPED_GEOMETRY* geometry;
	VideoClientContext* video;
} PresentationContext;

typedef struct
{
	BYTE PresentationId;
	UINT64 publishTime;
	UINT64 hnsDuration;
	MAPPED_GEOMETRY* geometry;
	UINT32 w, h;
	UINT32 scanline;
	BYTE* surfaceData;
} VideoFrame;

/** @brief private data for the channel */
struct s_VideoClientContextPriv
{
	VideoClientContext* video;
	GeometryClientContext* geometry;
	wQueue* frames;
	CRITICAL_SECTION framesLock;
	wBufferPool* surfacePool;
	UINT32 publishedFrames;
	UINT32 droppedFrames;
	UINT32 lastSentRate;
	UINT64 nextFeedbackTime;
	PresentationContext* currentPresentation;
	FreeRDP_TimerID timerID;
};

static void PresentationContext_unref(PresentationContext** presentation);
static void VideoClientContextPriv_free(VideoClientContextPriv* priv);

WINPR_ATTR_NODISCARD
static const char* video_command_name(BYTE cmd)
{
	switch (cmd)
	{
		case TSMM_START_PRESENTATION:
			return "start";
		case TSMM_STOP_PRESENTATION:
			return "stop";
		default:
			return "<unknown>";
	}
}

static void video_client_context_set_geometry(VideoClientContext* video,
                                              GeometryClientContext* geometry)
{
	WINPR_ASSERT(video);
	WINPR_ASSERT(video->priv);
	video->priv->geometry = geometry;
}

WINPR_ATTR_MALLOC(VideoClientContextPriv_free, 1)
static VideoClientContextPriv* VideoClientContextPriv_new(VideoClientContext* video)
{
	VideoClientContextPriv* ret = nullptr;

	WINPR_ASSERT(video);
	ret = calloc(1, sizeof(*ret));
	if (!ret)
		return nullptr;

	ret->frames = Queue_New(TRUE, 10, 2);
	if (!ret->frames)
	{
		WLog_ERR(TAG, "unable to allocate frames queue");
		goto fail;
	}

	ret->surfacePool = BufferPool_New(FALSE, 0, 16);
	if (!ret->surfacePool)
	{
		WLog_ERR(TAG, "unable to create surface pool");
		goto fail;
	}

	if (!InitializeCriticalSectionAndSpinCount(&ret->framesLock, 4 * 1000))
	{
		WLog_ERR(TAG, "unable to initialize frames lock");
		goto fail;
	}

	ret->video = video;

	/* don't set to unlimited so that we have the chance to send a feedback in
	 * the first second (for servers that want feedback directly)
	 */
	ret->lastSentRate = 30;
	return ret;

fail:
	VideoClientContextPriv_free(ret);
	return nullptr;
}

WINPR_ATTR_NODISCARD
static BOOL PresentationContext_ref(PresentationContext* presentation)
{
	WINPR_ASSERT(presentation);

	const LONG val = InterlockedIncrement(&presentation->refCounter);
	return val > 0;
}

static void PresentationContext_free(PresentationContext* presentation)
{
	if (!presentation)
		return;

	MAPPED_GEOMETRY* geometry = presentation->geometry;
	if (geometry)
	{
		geometry->MappedGeometryUpdate = nullptr;
		geometry->MappedGeometryClear = nullptr;
		geometry->custom = nullptr;
		mappedGeometryUnref(geometry);
	}

	h264_context_free(presentation->h264);
	Stream_Free(presentation->currentSample, TRUE);
	presentation->video->deleteSurface(presentation->video, presentation->surface);
	free(presentation);
}

WINPR_ATTR_MALLOC(PresentationContext_free, 1)
static PresentationContext* PresentationContext_new(VideoClientContext* video, BYTE PresentationId,
                                                    UINT32 x, UINT32 y, UINT32 width, UINT32 height)
{
	size_t s = 4ULL * width * height;
	PresentationContext* ret = nullptr;

	WINPR_ASSERT(video);

	if (s > INT32_MAX)
		return nullptr;

	ret = calloc(1, sizeof(*ret));
	if (!ret)
		return nullptr;

	ret->video = video;
	ret->PresentationId = PresentationId;

	ret->h264 = h264_context_new(FALSE);
	if (!ret->h264)
	{
		WLog_ERR(TAG, "unable to create a h264 context");
		goto fail;
	}
	if (!h264_context_reset(ret->h264, width, height))
		goto fail;

	ret->currentSample = Stream_New(nullptr, 4096);
	if (!ret->currentSample)
	{
		WLog_ERR(TAG, "unable to create current packet stream");
		goto fail;
	}

	ret->surface = video->createSurface(video, x, y, width, height);
	if (!ret->surface)
	{
		WLog_ERR(TAG, "unable to create surface");
		goto fail;
	}

	if (!PresentationContext_ref(ret))
		goto fail;

	return ret;

fail:
	PresentationContext_free(ret);
	return nullptr;
}

static void PresentationContext_unref(PresentationContext** ppresentation)
{
	WINPR_ASSERT(ppresentation);

	PresentationContext* presentation = *ppresentation;
	if (!presentation)
		return;

	if (InterlockedDecrement(&presentation->refCounter) > 0)
		return;
	*ppresentation = nullptr;

	PresentationContext_free(presentation);
}

static void VideoFrame_free(VideoClientContextPriv* priv, VideoFrame* frame)
{
	WINPR_ASSERT(priv);
	if (!frame)
		return;

	mappedGeometryUnref(frame->geometry);

	BufferPool_Return(priv->surfacePool, frame->surfaceData);
	free(frame);
}

WINPR_ATTR_MALLOC(VideoFrame_free, 1)
static VideoFrame* VideoFrame_new(VideoClientContextPriv* priv, PresentationContext* presentation,
                                  MAPPED_GEOMETRY* geom)
{
	WINPR_ASSERT(priv);
	WINPR_ASSERT(presentation);
	WINPR_ASSERT(geom);

	const VideoSurface* surface = presentation->surface;
	WINPR_ASSERT(surface);

	VideoFrame* frame = calloc(1, sizeof(VideoFrame));
	if (!frame)
		goto fail;
	frame->PresentationId = presentation->PresentationId;

	mappedGeometryRef(geom);

	frame->publishTime = presentation->lastPublishTime;
	frame->geometry = geom;
	frame->w = surface->alignedWidth;
	frame->h = surface->alignedHeight;
	frame->scanline = surface->scanline;

	frame->surfaceData = BufferPool_Take(priv->surfacePool, 1ll * frame->scanline * frame->h);
	if (!frame->surfaceData)
		goto fail;

	return frame;

fail:
	VideoFrame_free(priv, frame);
	return nullptr;
}

void VideoClientContextPriv_free(VideoClientContextPriv* priv)
{
	if (!priv)
		return;

	EnterCriticalSection(&priv->framesLock);

	if (priv->frames)
	{
		while (Queue_Count(priv->frames))
		{
			VideoFrame* frame = Queue_Dequeue(priv->frames);
			if (frame)
				VideoFrame_free(priv, frame);
		}
	}

	Queue_Free(priv->frames);
	LeaveCriticalSection(&priv->framesLock);

	DeleteCriticalSection(&priv->framesLock);

	if (priv->currentPresentation)
		PresentationContext_unref(&priv->currentPresentation);

	BufferPool_Free(priv->surfacePool);
	free(priv);
}

WINPR_ATTR_NODISCARD
static UINT video_channel_write(VIDEO_PLUGIN* video, const BYTE* data, UINT32 length)
{
	WINPR_ASSERT(video);

	if (!video->control_callback || !video->control_callback->channel_callback)
		return ERROR_BAD_CONFIGURATION;
	IWTSVirtualChannel* channel = video->control_callback->channel_callback->channel;
	if (!channel || !channel->Write)
		return ERROR_BAD_CONFIGURATION;
	return channel->Write(channel, length, data, nullptr);
}

WINPR_ATTR_NODISCARD
static UINT video_control_send_presentation_response(VideoClientContext* context,
                                                     TSMM_PRESENTATION_RESPONSE* resp)
{
	BYTE buf[12] = WINPR_C_ARRAY_INIT;

	WINPR_ASSERT(context);
	WINPR_ASSERT(resp);

	VIDEO_PLUGIN* video = (VIDEO_PLUGIN*)context->handle;
	WINPR_ASSERT(video);

	wStream* s = Stream_New(buf, 12);
	if (!s)
		return CHANNEL_RC_NO_MEMORY;

	Stream_Write_UINT32(s, 12);                                     /* cbSize */
	Stream_Write_UINT32(s, TSMM_PACKET_TYPE_PRESENTATION_RESPONSE); /* PacketType */
	Stream_Write_UINT8(s, resp->PresentationId);
	Stream_Zero(s, 3);
	Stream_SealLength(s);
	Stream_Free(s, FALSE);

	return video_channel_write(video, buf, sizeof(buf));
}

WINPR_ATTR_NODISCARD
static BOOL video_onMappedGeometryUpdate(MAPPED_GEOMETRY* geometry)
{
	WINPR_ASSERT(geometry);

	PresentationContext* presentation = (PresentationContext*)geometry->custom;
	WINPR_ASSERT(presentation);

	RDP_RECT* r = &geometry->geometry.boundingRect;
	WLog_DBG(TAG,
	         "geometry updated topGeom=(%" PRId32 ",%" PRId32 "-%" PRId32 "x%" PRId32
	         ") geom=(%" PRId32 ",%" PRId32 "-%" PRId32 "x%" PRId32 ") rects=(%" PRId16 ",%" PRId16
	         "-%" PRId16 "x%" PRId16 ")",
	         geometry->topLevelLeft, geometry->topLevelTop,
	         geometry->topLevelRight - geometry->topLevelLeft,
	         geometry->topLevelBottom - geometry->topLevelTop,

	         geometry->left, geometry->top, geometry->right - geometry->left,
	         geometry->bottom - geometry->top,

	         r->x, r->y, r->width, r->height);

	WINPR_ASSERT(presentation->surface);
	presentation->surface->x =
	    WINPR_ASSERTING_INT_CAST(uint32_t, geometry->topLevelLeft + geometry->left);
	presentation->surface->y =
	    WINPR_ASSERTING_INT_CAST(uint32_t, geometry->topLevelTop + geometry->top);

	return TRUE;
}

WINPR_ATTR_NODISCARD
static BOOL video_onMappedGeometryClear(MAPPED_GEOMETRY* geometry)
{
	WINPR_ASSERT(geometry);

	PresentationContext* presentation = (PresentationContext*)geometry->custom;
	WINPR_ASSERT(presentation);

	mappedGeometryUnref(presentation->geometry);
	presentation->geometry = nullptr;
	return TRUE;
}

WINPR_ATTR_NODISCARD
static UINT video_PresentationRequest(VideoClientContext* video,
                                      const TSMM_PRESENTATION_REQUEST* req)
{
	UINT ret = CHANNEL_RC_OK;

	WINPR_ASSERT(video);
	WINPR_ASSERT(req);

	VideoClientContextPriv* priv = video->priv;
	WINPR_ASSERT(priv);

	EnterCriticalSection(&priv->framesLock);
	if (req->Command == TSMM_START_PRESENTATION)
	{
		MAPPED_GEOMETRY* geom = nullptr;
		TSMM_PRESENTATION_RESPONSE resp = WINPR_C_ARRAY_INIT;

		if (memcmp(req->VideoSubtypeId, MFVideoFormat_H264, 16) != 0)
		{
			WLog_ERR(TAG, "not a H264 video, ignoring request");
			goto fail;
		}

		if (priv->currentPresentation)
		{
			if (priv->currentPresentation->PresentationId == req->PresentationId)
			{
				WLog_ERR(TAG, "ignoring start request for existing presentation %" PRIu8,
				         req->PresentationId);
				goto fail;
			}

			WLog_ERR(TAG, "releasing current presentation %" PRIu8, req->PresentationId);
			PresentationContext_unref(&priv->currentPresentation);
		}

		if (!priv->geometry)
		{
			WLog_ERR(TAG, "geometry channel not ready, ignoring request");
			goto fail;
		}

		geom = HashTable_GetItemValue(priv->geometry->geometries, &(req->GeometryMappingId));
		if (!geom)
		{
			WLog_ERR(TAG, "geometry mapping 0x%" PRIx64 " not registered", req->GeometryMappingId);
			goto fail;
		}

		WLog_DBG(TAG, "creating presentation 0x%x", req->PresentationId);
		priv->currentPresentation = PresentationContext_new(
		    video, req->PresentationId,
		    WINPR_ASSERTING_INT_CAST(uint32_t, geom->topLevelLeft + geom->left),
		    WINPR_ASSERTING_INT_CAST(uint32_t, geom->topLevelTop + geom->top), req->SourceWidth,
		    req->SourceHeight);
		if (!priv->currentPresentation)
		{
			WLog_ERR(TAG, "unable to create presentation video");
			ret = CHANNEL_RC_NO_MEMORY;
			goto fail;
		}

		mappedGeometryRef(geom);
		priv->currentPresentation->geometry = geom;

		priv->currentPresentation->video = video;
		priv->currentPresentation->ScaledWidth = req->ScaledWidth;
		priv->currentPresentation->ScaledHeight = req->ScaledHeight;

		geom->custom = priv->currentPresentation;
		geom->MappedGeometryUpdate = video_onMappedGeometryUpdate;
		geom->MappedGeometryClear = video_onMappedGeometryClear;

		/* send back response */
		resp.PresentationId = req->PresentationId;
		ret = video_control_send_presentation_response(video, &resp);
	}
	else if (req->Command == TSMM_STOP_PRESENTATION)
	{
		WLog_DBG(TAG, "stopping presentation 0x%x", req->PresentationId);
		if (!priv->currentPresentation)
		{
			WLog_ERR(TAG, "unknown presentation to stop %" PRIu8, req->PresentationId);
			goto fail;
		}

		priv->droppedFrames = 0;
		priv->publishedFrames = 0;
		PresentationContext_unref(&priv->currentPresentation);
	}

fail:
	LeaveCriticalSection(&priv->framesLock);
	return ret;
}

WINPR_ATTR_NODISCARD
static UINT video_read_tsmm_presentation_req(VideoClientContext* context, wStream* s)
{
	TSMM_PRESENTATION_REQUEST req = WINPR_C_ARRAY_INIT;

	WINPR_ASSERT(context);
	WINPR_ASSERT(s);

	if (!Stream_CheckAndLogRequiredLength(TAG, s, 60))
		return ERROR_INVALID_DATA;

	Stream_Read_UINT8(s, req.PresentationId);
	Stream_Read_UINT8(s, req.Version);
	Stream_Read_UINT8(s, req.Command);
	Stream_Read_UINT8(s, req.FrameRate); /* FrameRate - reserved and ignored */

	Stream_Seek_UINT16(s); /* AverageBitrateKbps reserved and ignored */
	Stream_Seek_UINT16(s); /* reserved */

	Stream_Read_UINT32(s, req.SourceWidth);
	Stream_Read_UINT32(s, req.SourceHeight);
	Stream_Read_UINT32(s, req.ScaledWidth);
	Stream_Read_UINT32(s, req.ScaledHeight);
	Stream_Read_UINT64(s, req.hnsTimestampOffset);
	Stream_Read_UINT64(s, req.GeometryMappingId);
	Stream_Read(s, req.VideoSubtypeId, 16);

	Stream_Read_UINT32(s, req.cbExtra);

	if (!Stream_CheckAndLogRequiredLength(TAG, s, req.cbExtra))
		return ERROR_INVALID_DATA;

	req.pExtraData = Stream_Pointer(s);

	WLog_DBG(TAG,
	         "presentationReq: id:%" PRIu8 " version:%" PRIu8
	         " command:%s srcWidth/srcHeight=%" PRIu32 "x%" PRIu32 " scaled Width/Height=%" PRIu32
	         "x%" PRIu32 " timestamp=%" PRIu64 " mappingId=%" PRIx64 "",
	         req.PresentationId, req.Version, video_command_name(req.Command), req.SourceWidth,
	         req.SourceHeight, req.ScaledWidth, req.ScaledHeight, req.hnsTimestampOffset,
	         req.GeometryMappingId);

	return video_PresentationRequest(context, &req);
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
WINPR_ATTR_NODISCARD
static UINT video_control_on_data_received(IWTSVirtualChannelCallback* pChannelCallback, wStream* s)
{
	GENERIC_CHANNEL_CALLBACK* callback = (GENERIC_CHANNEL_CALLBACK*)pChannelCallback;
	UINT ret = CHANNEL_RC_OK;
	UINT32 cbSize = 0;
	UINT32 packetType = 0;

	WINPR_ASSERT(callback);
	WINPR_ASSERT(s);

	VIDEO_PLUGIN* video = (VIDEO_PLUGIN*)callback->plugin;
	WINPR_ASSERT(video);

	VideoClientContext* context = (VideoClientContext*)video->wtsPlugin.pInterface;
	WINPR_ASSERT(context);

	if (!Stream_CheckAndLogRequiredLength(TAG, s, 4))
		return ERROR_INVALID_DATA;

	Stream_Read_UINT32(s, cbSize);
	if (cbSize < 8)
	{
		WLog_ERR(TAG, "invalid cbSize %" PRIu32 ", expected 8", cbSize);
		return ERROR_INVALID_DATA;
	}
	if (!Stream_CheckAndLogRequiredLength(TAG, s, cbSize - 4))
		return ERROR_INVALID_DATA;

	Stream_Read_UINT32(s, packetType);
	switch (packetType)
	{
		case TSMM_PACKET_TYPE_PRESENTATION_REQUEST:
			ret = video_read_tsmm_presentation_req(context, s);
			break;
		default:
			WLog_ERR(TAG, "not expecting packet type %" PRIu32 "", packetType);
			ret = ERROR_UNSUPPORTED_TYPE;
			break;
	}

	return ret;
}

static UINT video_control_send_client_notification(VideoClientContext* context,
                                                   const TSMM_CLIENT_NOTIFICATION* notif)
{
	BYTE buf[100] = WINPR_C_ARRAY_INIT;

	WINPR_ASSERT(context);
	WINPR_ASSERT(notif);

	VIDEO_PLUGIN* video = (VIDEO_PLUGIN*)context->handle;
	WINPR_ASSERT(video);

	wStream* s = Stream_New(buf, 32);
	if (!s)
		return CHANNEL_RC_NO_MEMORY;

	UINT32 cbSize = 16;
	Stream_Seek_UINT32(s);                                        /* cbSize */
	Stream_Write_UINT32(s, TSMM_PACKET_TYPE_CLIENT_NOTIFICATION); /* PacketType */
	Stream_Write_UINT8(s, notif->PresentationId);
	Stream_Write_UINT8(s, notif->NotificationType);
	Stream_Zero(s, 2);
	if (notif->NotificationType == TSMM_CLIENT_NOTIFICATION_TYPE_FRAMERATE_OVERRIDE)
	{
		Stream_Write_UINT32(s, 16); /* cbData */

		/* TSMM_CLIENT_NOTIFICATION_FRAMERATE_OVERRIDE */
		Stream_Write_UINT32(s, notif->FramerateOverride.Flags);
		Stream_Write_UINT32(s, notif->FramerateOverride.DesiredFrameRate);
		Stream_Zero(s, 4ULL * 2ULL);

		cbSize += 4UL * 4UL;
	}
	else
	{
		Stream_Write_UINT32(s, 0); /* cbData */
	}

	Stream_SealLength(s);
	Stream_ResetPosition(s);
	Stream_Write_UINT32(s, cbSize);
	Stream_Free(s, FALSE);

	return video_channel_write(video, buf, cbSize);
}

static void video_timer(VideoClientContext* video, UINT64 now)
{
	VideoFrame* frame = nullptr;

	WINPR_ASSERT(video);

	VideoClientContextPriv* priv = video->priv;
	WINPR_ASSERT(priv);

	EnterCriticalSection(&priv->framesLock);
	PresentationContext* presentation = video->priv->currentPresentation;
	do
	{
		const VideoFrame* peekFrame = (VideoFrame*)Queue_Peek(priv->frames);
		if (!peekFrame)
			break;

		if (peekFrame->publishTime > now)
			break;

		if (frame)
		{
			WLog_DBG(TAG, "dropping frame @%" PRIu64, frame->publishTime);
			priv->droppedFrames++;
			VideoFrame_free(priv, frame);
		}
		frame = Queue_Dequeue(priv->frames);
	} while (1);

	if (frame)
	{
		if (presentation && (presentation->PresentationId == frame->PresentationId))
		{
			VideoSurface* surface = presentation->surface;
			const size_t frameSize = 1ull * frame->scanline * frame->h;
			const size_t surfaceSize = 1ull * surface->scanline * surface->alignedHeight;

			/* the presentation id is reused by the server across presentations of different
			 * sizes, so a frame queued for a previous, larger presentation can outlive it in
			 * the queue. copying it would write past the smaller surface->data buffer. */
			if (frameSize > surfaceSize)
				WLog_WARN(TAG, "dropping stale frame of %" PRIuz " bytes, surface holds %" PRIuz,
				          frameSize, surfaceSize);
			else
			{
				priv->publishedFrames++;
				memcpy(surface->data, frame->surfaceData, frameSize);

				WINPR_ASSERT(video->showSurface);
				if (!video->showSurface(video, surface, presentation->ScaledWidth,
				                        presentation->ScaledHeight))
					WLog_WARN(TAG, "showSurface failed");
			}
		}
		VideoFrame_free(priv, frame);
	}

	if (priv->nextFeedbackTime < now)
	{
		/* we can compute some feedback only if we have some published frames and
		 * a current presentation
		 */
		if (priv->publishedFrames && priv->currentPresentation)
		{
			UINT32 computedRate = 0;

			if (!PresentationContext_ref(priv->currentPresentation))
				WLog_WARN(TAG, "PresentationContext_ref(priv->currentPresentation) failed");

			if (priv->droppedFrames)
			{
				/**
				 * some dropped frames, looks like we're asking too many frames per seconds,
				 * try lowering rate. We go directly from unlimited rate to 24 frames/seconds
				 * otherwise we lower rate by 2 frames by seconds
				 */
				if (priv->lastSentRate == XF_VIDEO_UNLIMITED_RATE)
					computedRate = 24;
				else
				{
					computedRate = priv->lastSentRate - 2;
					if (!computedRate)
						computedRate = 2;
				}
			}
			else
			{
				/**
				 * we treat all frames ok, so either ask the server to send more,
				 * or stay unlimited
				 */
				if (priv->lastSentRate == XF_VIDEO_UNLIMITED_RATE)
					computedRate = XF_VIDEO_UNLIMITED_RATE; /* stay unlimited */
				else
				{
					computedRate = priv->lastSentRate + 2;
					if (computedRate > XF_VIDEO_UNLIMITED_RATE)
						computedRate = XF_VIDEO_UNLIMITED_RATE;
				}
			}

			if (computedRate != priv->lastSentRate)
			{
				TSMM_CLIENT_NOTIFICATION notif = WINPR_C_ARRAY_INIT;

				WINPR_ASSERT(priv->currentPresentation);
				notif.PresentationId = priv->currentPresentation->PresentationId;
				notif.NotificationType = TSMM_CLIENT_NOTIFICATION_TYPE_FRAMERATE_OVERRIDE;
				if (computedRate == XF_VIDEO_UNLIMITED_RATE)
				{
					notif.FramerateOverride.Flags = 0x01;
					notif.FramerateOverride.DesiredFrameRate = 0x00;
				}
				else
				{
					notif.FramerateOverride.Flags = 0x02;
					notif.FramerateOverride.DesiredFrameRate = computedRate;
				}

				video_control_send_client_notification(video, &notif);
				priv->lastSentRate = computedRate;

				WLog_VRB(TAG,
				         "server notified with rate %" PRIu32 " published=%" PRIu32
				         " dropped=%" PRIu32,
				         priv->lastSentRate, priv->publishedFrames, priv->droppedFrames);
			}

			PresentationContext_unref(&priv->currentPresentation);
		}

		priv->droppedFrames = 0;
		priv->publishedFrames = 0;
		priv->nextFeedbackTime = now + 1000;
	}
	LeaveCriticalSection(&priv->framesLock);
}

WINPR_ATTR_NODISCARD
static UINT video_VideoData(VideoClientContext* context, const TSMM_VIDEO_DATA* data)
{
	int status = 0;
	UINT res = CHANNEL_RC_OK;

	WINPR_ASSERT(context);
	WINPR_ASSERT(data);

	VideoClientContextPriv* priv = context->priv;
	WINPR_ASSERT(priv);

	PresentationContext* presentation = priv->currentPresentation;
	if (!presentation)
	{
		WLog_ERR(TAG, "no current presentation");
		return CHANNEL_RC_OK;
	}

	if (!PresentationContext_ref(presentation))
		return ERROR_INTERNAL_ERROR;

	EnterCriticalSection(&priv->framesLock);
	if (presentation->PresentationId != data->PresentationId)
	{
		WLog_ERR(TAG, "current presentation id=%" PRIu8 " doesn't match data id=%" PRIu8,
		         presentation->PresentationId, data->PresentationId);
		goto out;
	}

	if (!Stream_EnsureRemainingCapacity(presentation->currentSample, data->cbSample))
	{
		WLog_ERR(TAG, "unable to expand the current packet");
		res = CHANNEL_RC_NO_MEMORY;
		goto out;
	}

	Stream_Write(presentation->currentSample, data->pSample, data->cbSample);

	if (data->CurrentPacketIndex == data->PacketsInSample)
	{
		VideoSurface* surface = presentation->surface;
		H264_CONTEXT* h264 = presentation->h264;
		const UINT64 startTime = winpr_GetTickCount64NS();
		MAPPED_GEOMETRY* geom = presentation->geometry;

		const RECTANGLE_16 rect = { 0, 0, WINPR_ASSERTING_INT_CAST(UINT16, surface->alignedWidth),
			                        WINPR_ASSERTING_INT_CAST(UINT16, surface->alignedHeight) };
		Stream_SealLength(presentation->currentSample);
		Stream_ResetPosition(presentation->currentSample);

		if (data->SampleNumber == 1)
		{
			presentation->lastPublishTime = startTime;
		}

		presentation->lastPublishTime += 100ull * data->hnsDuration;
		const size_t len = Stream_Length(presentation->currentSample);
		if (len > UINT32_MAX)
			goto out;

		BOOL enqueueResult = 0;
		VideoFrame* frame = VideoFrame_new(priv, presentation, geom);
		if (!frame)
		{
			WLog_ERR(TAG, "unable to create frame");
			res = CHANNEL_RC_NO_MEMORY;
			goto out;
		}

		status = avc420_decompress(h264, Stream_Pointer(presentation->currentSample), (UINT32)len,
		                           frame->surfaceData, surface->format, surface->scanline,
		                           surface->alignedWidth, surface->alignedHeight, &rect, 1);
		if (status < 0)
		{
			VideoFrame_free(priv, frame);
			goto out;
		}

		enqueueResult = Queue_Enqueue(priv->frames, frame);

		if (!enqueueResult)
		{
			WLog_ERR(TAG, "unable to enqueue frame");
			VideoFrame_free(priv, frame);
			res = CHANNEL_RC_NO_MEMORY;
			goto out;
		}

		// NOLINTNEXTLINE(clang-analyzer-unix.Malloc): Queue_Enqueue owns frame
		WLog_DBG(TAG, "scheduling frame in %" PRIu64 " ns", (frame->publishTime - startTime));
	}

out:
	PresentationContext_unref(&priv->currentPresentation);
	LeaveCriticalSection(&priv->framesLock);

	return res;
}

WINPR_ATTR_NODISCARD
static UINT video_data_on_data_received(IWTSVirtualChannelCallback* pChannelCallback, wStream* s)
{
	GENERIC_CHANNEL_CALLBACK* callback = (GENERIC_CHANNEL_CALLBACK*)pChannelCallback;
	UINT32 cbSize = 0;
	UINT32 packetType = 0;
	TSMM_VIDEO_DATA data;

	VIDEO_PLUGIN* video = (VIDEO_PLUGIN*)callback->plugin;
	WINPR_ASSERT(video);

	VideoClientContext* context = (VideoClientContext*)video->wtsPlugin.pInterface;

	if (!Stream_CheckAndLogRequiredLength(TAG, s, 4))
		return ERROR_INVALID_DATA;

	Stream_Read_UINT32(s, cbSize);
	if (cbSize < 8)
	{
		WLog_ERR(TAG, "invalid cbSize %" PRIu32 ", expected >= 8", cbSize);
		return ERROR_INVALID_DATA;
	}

	if (!Stream_CheckAndLogRequiredLength(TAG, s, cbSize - 4))
		return ERROR_INVALID_DATA;

	Stream_Read_UINT32(s, packetType);
	if (packetType != TSMM_PACKET_TYPE_VIDEO_DATA)
	{
		WLog_ERR(TAG, "only expecting VIDEO_DATA on the data channel");
		return ERROR_INVALID_DATA;
	}

	if (!Stream_CheckAndLogRequiredLength(TAG, s, 32))
		return ERROR_INVALID_DATA;

	Stream_Read_UINT8(s, data.PresentationId);
	Stream_Read_UINT8(s, data.Version);
	Stream_Read_UINT8(s, data.Flags);
	Stream_Seek_UINT8(s); /* reserved */
	Stream_Read_UINT64(s, data.hnsTimestamp);
	Stream_Read_UINT64(s, data.hnsDuration);
	Stream_Read_UINT16(s, data.CurrentPacketIndex);
	Stream_Read_UINT16(s, data.PacketsInSample);
	Stream_Read_UINT32(s, data.SampleNumber);
	Stream_Read_UINT32(s, data.cbSample);
	if (!Stream_CheckAndLogRequiredLength(TAG, s, data.cbSample))
		return ERROR_INVALID_DATA;
	data.pSample = Stream_Pointer(s);

	/*
	    WLog_DBG(TAG, "videoData: id:%"PRIu8" version:%"PRIu8" flags:0x%"PRIx8" timestamp=%"PRIu64"
	   duration=%"PRIu64 " curPacketIndex:%"PRIu16" packetInSample:%"PRIu16" sampleNumber:%"PRIu32"
	   cbSample:%"PRIu32"", data.PresentationId, data.Version, data.Flags, data.hnsTimestamp,
	   data.hnsDuration, data.CurrentPacketIndex, data.PacketsInSample, data.SampleNumber,
	   data.cbSample);
	*/

	return video_VideoData(context, &data);
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
WINPR_ATTR_NODISCARD
static UINT video_control_on_close(IWTSVirtualChannelCallback* pChannelCallback)
{
	if (pChannelCallback)
	{
		GENERIC_CHANNEL_CALLBACK* listener_callback = (GENERIC_CHANNEL_CALLBACK*)pChannelCallback;
		VIDEO_PLUGIN* video = (VIDEO_PLUGIN*)listener_callback->plugin;
		if (video && video->control_callback)
		{
			video->control_callback->channel_callback = nullptr;
		}
	}
	free(pChannelCallback);
	return CHANNEL_RC_OK;
}

WINPR_ATTR_NODISCARD
static UINT video_data_on_close(IWTSVirtualChannelCallback* pChannelCallback)
{
	if (pChannelCallback)
	{
		GENERIC_CHANNEL_CALLBACK* listener_callback = (GENERIC_CHANNEL_CALLBACK*)pChannelCallback;
		VIDEO_PLUGIN* video = (VIDEO_PLUGIN*)listener_callback->plugin;
		if (video && video->data_callback)
		{
			video->data_callback->channel_callback = nullptr;
		}
	}
	free(pChannelCallback);
	return CHANNEL_RC_OK;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
// NOLINTBEGIN(readability-non-const-parameter)
WINPR_ATTR_NODISCARD
static UINT video_control_on_new_channel_connection(IWTSListenerCallback* listenerCallback,
                                                    IWTSVirtualChannel* channel,
                                                    WINPR_ATTR_UNUSED BYTE* Data,
                                                    WINPR_ATTR_UNUSED BOOL* pbAccept,
                                                    IWTSVirtualChannelCallback** ppCallback)
// NOLINTEND(readability-non-const-parameter)
{
	GENERIC_LISTENER_CALLBACK* listener_callback = (GENERIC_LISTENER_CALLBACK*)listenerCallback;

	GENERIC_CHANNEL_CALLBACK* callback =
	    (GENERIC_CHANNEL_CALLBACK*)calloc(1, sizeof(GENERIC_CHANNEL_CALLBACK));
	if (!callback)
	{
		WLog_ERR(TAG, "calloc failed!");
		return CHANNEL_RC_NO_MEMORY;
	}

	callback->iface.OnDataReceived = video_control_on_data_received;
	callback->iface.OnClose = video_control_on_close;
	callback->plugin = listener_callback->plugin;
	callback->channel_mgr = listener_callback->channel_mgr;
	callback->channel = channel;
	listener_callback->channel_callback = callback;

	*ppCallback = &callback->iface;

	return CHANNEL_RC_OK;
}

// NOLINTBEGIN(readability-non-const-parameter)
WINPR_ATTR_NODISCARD
static UINT video_data_on_new_channel_connection(IWTSListenerCallback* pListenerCallback,
                                                 IWTSVirtualChannel* pChannel,
                                                 WINPR_ATTR_UNUSED BYTE* Data,
                                                 WINPR_ATTR_UNUSED BOOL* pbAccept,
                                                 IWTSVirtualChannelCallback** ppCallback)
// NOLINTEND(readability-non-const-parameter)
{
	GENERIC_LISTENER_CALLBACK* listener_callback = (GENERIC_LISTENER_CALLBACK*)pListenerCallback;

	GENERIC_CHANNEL_CALLBACK* callback =
	    (GENERIC_CHANNEL_CALLBACK*)calloc(1, sizeof(GENERIC_CHANNEL_CALLBACK));
	if (!callback)
	{
		WLog_ERR(TAG, "calloc failed!");
		return CHANNEL_RC_NO_MEMORY;
	}

	callback->iface.OnDataReceived = video_data_on_data_received;
	callback->iface.OnClose = video_data_on_close;
	callback->plugin = listener_callback->plugin;
	callback->channel_mgr = listener_callback->channel_mgr;
	callback->channel = pChannel;
	listener_callback->channel_callback = callback;

	*ppCallback = &callback->iface;

	return CHANNEL_RC_OK;
}

WINPR_ATTR_NODISCARD
static uint64_t timer_cb(WINPR_ATTR_UNUSED rdpContext* context, void* userdata,
                         WINPR_ATTR_UNUSED FreeRDP_TimerID timerID, uint64_t timestamp,
                         uint64_t interval)
{
	VideoClientContext* video = userdata;
	if (!video)
		return 0;
	if (!video->timer)
		return 0;

	video->timer(video, timestamp);

	return interval;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
WINPR_ATTR_NODISCARD
static UINT video_plugin_initialize(IWTSPlugin* plugin, IWTSVirtualChannelManager* channelMgr)
{
	UINT status = 0;
	VIDEO_PLUGIN* video = (VIDEO_PLUGIN*)plugin;

	if (video->initialized)
	{
		WLog_ERR(TAG, "[%s] channel initialized twice, aborting", VIDEO_CONTROL_DVC_CHANNEL_NAME);
		return ERROR_INVALID_DATA;
	}

	{
		GENERIC_LISTENER_CALLBACK* callback =
		    (GENERIC_LISTENER_CALLBACK*)calloc(1, sizeof(GENERIC_LISTENER_CALLBACK));
		if (!callback)
		{
			WLog_ERR(TAG, "calloc for control callback failed!");
			return CHANNEL_RC_NO_MEMORY;
		}

		callback->iface.OnNewChannelConnection = video_control_on_new_channel_connection;
		callback->plugin = plugin;
		callback->channel_mgr = channelMgr;

		status = channelMgr->CreateListener(channelMgr, VIDEO_CONTROL_DVC_CHANNEL_NAME, 0,
		                                    &callback->iface, &(video->controlListener));
		video->control_callback = callback;
		if (status != CHANNEL_RC_OK)
			return status;
	}
	video->controlListener->pInterface = video->wtsPlugin.pInterface;

	{
		GENERIC_LISTENER_CALLBACK* callback =
		    (GENERIC_LISTENER_CALLBACK*)calloc(1, sizeof(GENERIC_LISTENER_CALLBACK));
		if (!callback)
		{
			WLog_ERR(TAG, "calloc for data callback failed!");
			return CHANNEL_RC_NO_MEMORY;
		}

		callback->iface.OnNewChannelConnection = video_data_on_new_channel_connection;
		callback->plugin = plugin;
		callback->channel_mgr = channelMgr;

		status = channelMgr->CreateListener(channelMgr, VIDEO_DATA_DVC_CHANNEL_NAME, 0,
		                                    &callback->iface, &(video->dataListener));
		video->data_callback = callback;
		if (status == CHANNEL_RC_OK)
			video->dataListener->pInterface = video->wtsPlugin.pInterface;
	}

	if (status == CHANNEL_RC_OK)
		video->context->priv->timerID =
		    freerdp_timer_add(video->rdpcontext, 20000000, timer_cb, video->context, true);
	video->initialized = video->context->priv->timerID != 0;
	if (!video->initialized)
		status = ERROR_INTERNAL_ERROR;
	return status;
}

/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
WINPR_ATTR_NODISCARD
static UINT video_plugin_terminated(IWTSPlugin* pPlugin)
{
	VIDEO_PLUGIN* video = (VIDEO_PLUGIN*)pPlugin;
	if (!video)
		return CHANNEL_RC_INVALID_INSTANCE;

	if (video->context && video->context->priv)
		freerdp_timer_remove(video->rdpcontext, video->context->priv->timerID);

	if (video->control_callback)
	{
		IWTSVirtualChannelManager* mgr = video->control_callback->channel_mgr;
		if (mgr)
			IFCALL(mgr->DestroyListener, mgr, video->controlListener);
	}
	if (video->data_callback)
	{
		IWTSVirtualChannelManager* mgr = video->data_callback->channel_mgr;
		if (mgr)
			IFCALL(mgr->DestroyListener, mgr, video->dataListener);
	}

	if (video->context)
		VideoClientContextPriv_free(video->context->priv);

	free(video->control_callback);
	free(video->data_callback);
	free(video->wtsPlugin.pInterface);
	free(pPlugin);
	return CHANNEL_RC_OK;
}

/**
 * Channel Client Interface
 */
/**
 * Function description
 *
 * @return 0 on success, otherwise a Win32 error code
 */
WINPR_ATTR_NODISCARD
FREERDP_ENTRY_POINT(UINT VCAPITYPE video_DVCPluginEntry(IDRDYNVC_ENTRY_POINTS* pEntryPoints))
{
	UINT error = ERROR_INTERNAL_ERROR;

	VIDEO_PLUGIN* videoPlugin = (VIDEO_PLUGIN*)pEntryPoints->GetPlugin(pEntryPoints, "video");
	if (!videoPlugin)
	{
		videoPlugin = (VIDEO_PLUGIN*)calloc(1, sizeof(VIDEO_PLUGIN));
		if (!videoPlugin)
		{
			WLog_ERR(TAG, "calloc failed!");
			return CHANNEL_RC_NO_MEMORY;
		}

		videoPlugin->wtsPlugin.Initialize = video_plugin_initialize;
		videoPlugin->wtsPlugin.Connected = nullptr;
		videoPlugin->wtsPlugin.Disconnected = nullptr;
		videoPlugin->wtsPlugin.Terminated = video_plugin_terminated;

		VideoClientContext* videoContext =
		    (VideoClientContext*)calloc(1, sizeof(VideoClientContext));
		if (!videoContext)
		{
			WLog_ERR(TAG, "calloc failed!");
			free(videoPlugin);
			return CHANNEL_RC_NO_MEMORY;
		}

		VideoClientContextPriv* priv = VideoClientContextPriv_new(videoContext);
		if (!priv)
		{
			WLog_ERR(TAG, "VideoClientContextPriv_new failed!");
			free(videoContext);
			free(videoPlugin);
			return CHANNEL_RC_NO_MEMORY;
		}

		videoContext->handle = (void*)videoPlugin;
		videoContext->priv = priv;
		videoContext->timer = video_timer;
		videoContext->setGeometry = video_client_context_set_geometry;

		videoPlugin->wtsPlugin.pInterface = (void*)videoContext;
		videoPlugin->context = videoContext;
		videoPlugin->rdpcontext = pEntryPoints->GetRdpContext(pEntryPoints);
		if (videoPlugin->rdpcontext)
			error = pEntryPoints->RegisterPlugin(pEntryPoints, "video", &videoPlugin->wtsPlugin);
	}
	else
	{
		WLog_ERR(TAG, "could not get video Plugin.");
		return CHANNEL_RC_BAD_CHANNEL;
	}

	return error;
}
