/**
 * vim: set ts=4 :
 * =============================================================================
 * SourceMod Sample Extension
 * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.
 * =============================================================================
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, version 3.0, as published by the
 * Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * As a special exception, AlliedModders LLC gives you permission to link the
 * code of this program (as well as its derivative works) to "Half-Life 2," the
 * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
 * by the Valve Corporation.  You must obey the GNU General Public License in
 * all respects for all other code used.  Additionally, AlliedModders LLC grants
 * this exception to all derivative works.  AlliedModders LLC defines further
 * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
 * or <http://www.sourcemod.net/license.php>.
 *
 * Version: $Id$
 */
//#define _GNU_SOURCE
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <poll.h>

#include <iclient.h>
#include <iserver.h>
#include <ISDKTools.h>

#include "extension.h"

#define LISTEN_ADDR "127.0.0.1"
//#define LISTEN_ADDR "10.0.0.101"
#define LISTEN_PORT 27020

/**
 * @file extension.cpp
 * @brief Implement extension code here.
 */

template <typename T> inline T min(T a, T b) { return a<b?a:b; }

/**
 * Polynomial: 0x04C11DB7
 */
const unsigned int CRCTable[256] = {
  0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
  0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
  0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
  0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
  0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
  0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
  0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
  0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
  0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
  0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
  0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
  0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
  0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
  0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
  0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
  0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
  0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
  0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
  0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
  0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
  0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
  0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
  0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
  0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
  0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
  0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
  0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
  0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
  0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
  0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
  0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
  0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
  0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
  0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
  0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
  0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
  0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
  0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
  0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
  0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d};

unsigned int UTIL_CRC32(const void *pdata, size_t data_length)
{
	unsigned char *data = (unsigned char *)pdata;
	unsigned int crc = 0xFFFFFFFF;
	unsigned char c;

	for(size_t i = 0; i < data_length; i++, data++)
	{
		c = (unsigned char)((crc ^ *data) & 0xFF);
		crc = CRCTable[c] ^ (crc >> 8);
	}

	return ~crc;
}

CVoice g_Interface;
SMEXT_LINK(&g_Interface);

ISDKTools *g_pSDKTools = NULL;
SH_DECL_MANUALHOOK0(GetPlayerSlot, 0, 0, 0, int); // IClient::GetPlayerSlot

double getTime()
{
    struct timespec tv;
    if(clock_gettime(CLOCK_REALTIME, &tv) != 0)
    	return 0;

    return (tv.tv_sec + (tv.tv_nsec / 1000000000.0));
}

void OnGameFrame(bool simulating)
{
	g_Interface.OnGameFrame(simulating);
}

CVoice::CVoice()
{
	m_ListenSocket = -1;

	m_PollFds = 0;
	for(int i = 1; i < 1 + MAX_CLIENTS; i++)
		m_aPollFds[i].fd = -1;

	for(int i = 0; i < MAX_CLIENTS; i++)
		m_aClients[i].m_Socket = -1;

	m_AvailableTime = 0.0;

	m_Silk_EncoderState = NULL;

	m_SV_BroadcastVoiceData = NULL;
}

bool CVoice::SDK_OnLoad(char *error, size_t maxlength, bool late)
{
	// Setup engine-specific data.
	Dl_info info;
	void *engineFactory = (void *)g_SMAPI->GetEngineFactory(false);
	if(dladdr(engineFactory, &info) == 0)
	{
		g_SMAPI->Format(error, maxlength, "dladdr(engineFactory) failed.");
		return false;
	}

	void *pEngineSo = dlopen(info.dli_fname, RTLD_NOW);
	if(pEngineSo == NULL)
	{
		g_SMAPI->Format(error, maxlength, "dlopen(%s) failed.", info.dli_fname);
		return false;
	}

	int engineVersion = g_SMAPI->GetSourceEngineBuild();
	int offsPlayerSlot = 0;

	switch (engineVersion)
	{
		case SOURCE_ENGINE_CSGO:
#ifdef _WIN32
			m_SV_BroadcastVoiceData = (t_SV_BroadcastVoiceData)memutils->FindPattern(pEngineSo, "\x55\x8B\xEC\x81\xEC\xD0\x00\x00\x00\x53\x56\x57", 12);
			offsPlayerSlot = 15;
#else
			m_SV_BroadcastVoiceData = (t_SV_BroadcastVoiceData)memutils->ResolveSymbol(pEngineSo, "_Z21SV_BroadcastVoiceDataP7IClientiPcx");
			offsPlayerSlot = 16;
#endif
			break;

		case SOURCE_ENGINE_LEFT4DEAD2:
#ifdef _WIN32
			m_SV_BroadcastVoiceData = (t_SV_BroadcastVoiceData)memutils->FindPattern(pEngineSo, "\x55\x8B\xEC\x83\xEC\x70\xA1\x2A\x2A\x2A\x2A\x33\xC5\x89\x45\xFC\xA1\x2A\x2A\x2A\x2A\x53\x56", 23);
			offsPlayerSlot = 14;
#else
			m_SV_BroadcastVoiceData = (t_SV_BroadcastVoiceData)memutils->ResolveSymbol(pEngineSo, "_Z21SV_BroadcastVoiceDataP7IClientiPcx");
			offsPlayerSlot = 15;
#endif
			break;

		case SOURCE_ENGINE_NUCLEARDAWN:
#ifdef _WIN32
			m_SV_BroadcastVoiceData = (t_SV_BroadcastVoiceData)memutils->FindPattern(pEngineSo, "\x55\x8B\xEC\xA1\x2A\x2A\x2A\x2A\x83\xEC\x58\x57\x33\xFF", 14);
			offsPlayerSlot = 14;
#else
			m_SV_BroadcastVoiceData = (t_SV_BroadcastVoiceData)memutils->ResolveSymbol(pEngineSo, "_Z21SV_BroadcastVoiceDataP7IClientiPcx");
			offsPlayerSlot = 15;
#endif
			break;

		case SOURCE_ENGINE_INSURGENCY:
#ifdef _WIN32
			m_SV_BroadcastVoiceData = (t_SV_BroadcastVoiceData)memutils->FindPattern(pEngineSo, "\x55\x8B\xEC\x83\xEC\x74\x68\x2A\x2A\x2A\x2A\x8D\x4D\xE4\xE8", 15);
			offsPlayerSlot = 14;
#else
			m_SV_BroadcastVoiceData = (t_SV_BroadcastVoiceData)memutils->ResolveSymbol(pEngineSo, "_Z21SV_BroadcastVoiceDataP7IClientiPcx");
			offsPlayerSlot = 15;
#endif
			break;

		case SOURCE_ENGINE_TF2:
		case SOURCE_ENGINE_CSS:
		case SOURCE_ENGINE_HL2DM:
		case SOURCE_ENGINE_DODS:
		case SOURCE_ENGINE_SDK2013:
#ifdef _WIN32
			m_SV_BroadcastVoiceData = (t_SV_BroadcastVoiceData)memutils->FindPattern(pEngineSo, "\x55\x8B\xEC\xA1\x2A\x2A\x2A\x2A\x83\xEC\x50\x83\x78\x30", 14);
			offsPlayerSlot = 14;
#else
			m_SV_BroadcastVoiceData = (t_SV_BroadcastVoiceData)memutils->ResolveSymbol(pEngineSo, "_Z21SV_BroadcastVoiceDataP7IClientiPcx");
			offsPlayerSlot = 15;
#endif
			break;

		default:
			g_SMAPI->Format(error, maxlength, "Unsupported game.");
			dlclose(pEngineSo);
			return false;
	}
	dlclose(pEngineSo);

	if(!m_SV_BroadcastVoiceData)
	{
		g_SMAPI->Format(error, maxlength, "SV_BroadcastVoiceData sigscan failed.");
		return false;
	}

	SH_MANUALHOOK_RECONFIGURE(GetPlayerSlot, offsPlayerSlot, 0, 0);

	// Init tcp server
	m_ListenSocket = socket(AF_INET, SOCK_STREAM, 0);
	if(m_ListenSocket < 0)
	{
		g_SMAPI->Format(error, maxlength, "Failed creating socket.");
		SDK_OnUnload();
		return false;
	}

	int yes = 1;
	if(setsockopt(m_ListenSocket, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) < 0)
	{
		g_SMAPI->Format(error, maxlength, "Failed setting SO_REUSEADDR on socket.");
		SDK_OnUnload();
		return false;
	}

	sockaddr_in bindAddr;
	memset(&bindAddr, 0, sizeof(bindAddr));
	bindAddr.sin_family = AF_INET;
	inet_aton(LISTEN_ADDR, &bindAddr.sin_addr);
	bindAddr.sin_port = htons(LISTEN_PORT);

	// Listen on LISTEN_ADDR:LISTEN_PORT
	if(bind(m_ListenSocket, (sockaddr *)&bindAddr, sizeof(sockaddr_in)) < 0)
	{
		g_SMAPI->Format(error, maxlength, "Failed binding to socket (%d '%s').", errno, strerror(errno));
		SDK_OnUnload();
		return false;
	}

	if(listen(m_ListenSocket, MAX_CLIENTS) < 0)
	{
		g_SMAPI->Format(error, maxlength, "Failed listening on socket.");
		SDK_OnUnload();
		return false;
	}

	m_aPollFds[0].fd = m_ListenSocket;
	m_aPollFds[0].events = POLLIN;
	m_PollFds++;

	// Encoder settings
	m_EncoderSettings.InputSampleRate_kHz = 48; // 8, 12, 16, 24, 32, 44.1, 48
	m_EncoderSettings.OutputSampleRate_kHz = 16; // 8, 12, 16, 24
	m_EncoderSettings.TargetBitRate_Kbps = 100; // 6 - 40
	m_EncoderSettings.PacketSize_ms = 20; // 20, 40, 60, 80, 100
	m_EncoderSettings.FrameSize_ms = 20; //
	m_EncoderSettings.PacketLoss_perc = 0; // 0 - 100
	m_EncoderSettings.Complexity = 2; // 0 - 2
	m_EncoderSettings.InBandFEC = 0; // 0, 1
	m_EncoderSettings.DTX = 0; // 0, 1

	// Init SILK encoder
	int encoderSize;
	SKP_Silk_SDK_Get_Encoder_Size(&encoderSize);

	m_Silk_EncoderState = malloc(encoderSize);
	if(!m_Silk_EncoderState)
	{
		g_SMAPI->Format(error, maxlength, "Failed to malloc %d bytes for silk encoder.", encoderSize);
		SDK_OnUnload();
		return false;
	}

	int retEnc = SKP_Silk_SDK_InitEncoder(m_Silk_EncoderState, &m_Silk_EncoderControl);
	if(retEnc != SKP_SILK_NO_ERROR)
	{
		g_SMAPI->Format(error, maxlength, "Silk encoder initialization failed with: %d", retEnc);
		SDK_OnUnload();
		return false;
	}

	m_Silk_EncoderControl.API_sampleRate = m_EncoderSettings.InputSampleRate_kHz * 1000;
	m_Silk_EncoderControl.maxInternalSampleRate = m_EncoderSettings.OutputSampleRate_kHz * 1000;
	m_Silk_EncoderControl.bitRate = m_EncoderSettings.TargetBitRate_Kbps * 1000;
	m_Silk_EncoderControl.packetSize = m_EncoderSettings.PacketSize_ms * m_EncoderSettings.InputSampleRate_kHz;
	m_Silk_EncoderControl.packetLossPercentage = m_EncoderSettings.PacketLoss_perc;
	m_Silk_EncoderControl.complexity = m_EncoderSettings.Complexity;
	m_Silk_EncoderControl.useInBandFEC = m_EncoderSettings.InBandFEC;
	m_Silk_EncoderControl.useDTX = m_EncoderSettings.DTX;

	smutils->AddGameFrameHook(::OnGameFrame);

	return true;
}

void CVoice::SDK_OnAllLoaded()
{
	SM_GET_LATE_IFACE(SDKTOOLS, g_pSDKTools);
	if(g_pSDKTools == NULL)
		smutils->LogError(myself, "SDKTools interface not found");
}

void CVoice::SDK_OnUnload()
{
	smutils->RemoveGameFrameHook(::OnGameFrame);

	if(m_ListenSocket != -1)
	{
		close(m_ListenSocket);
		m_ListenSocket = -1;
	}

	for(int Client = 0; Client < MAX_CLIENTS; Client++)
	{
		if(m_aClients[Client].m_Socket != -1)
		{
			close(m_aClients[Client].m_Socket);
			m_aClients[Client].m_Socket = -1;
		}
	}

	if(m_Silk_EncoderState)
	{
		free(m_Silk_EncoderState);
		m_Silk_EncoderState = NULL;
	}
}

void CVoice::OnGameFrame(bool simulating)
{
	HandleNetwork();
	HandleVoiceData();
}

void CVoice::HandleNetwork()
{
	if(m_ListenSocket == -1)
		return;

	int PollRes = poll(m_aPollFds, m_PollFds, 0);
	if(PollRes <= 0)
		return;

	// Accept new clients
	if(m_aPollFds[0].revents & POLLIN)
	{
		// Find slot
		int Client;
		for(Client = 0; Client < MAX_CLIENTS; Client++)
		{
			if(m_aClients[Client].m_Socket == -1)
				break;
		}

		// no free slot
		if(Client != MAX_CLIENTS)
		{
			sockaddr_in addr;
			size_t size = sizeof(sockaddr_in);
			int Socket = accept(m_ListenSocket, (sockaddr *)&addr, &size);

			m_aClients[Client].m_Socket = Socket;
			m_aClients[Client].m_BufferWriteIndex = 0;
			m_aClients[Client].m_LastLength = 0;
			m_aClients[Client].m_LastValidData = 0.0;
			m_aClients[Client].m_New = true;

			m_aPollFds[m_PollFds].fd = Socket;
			m_aPollFds[m_PollFds].events = POLLIN | POLLHUP;
			m_aPollFds[m_PollFds].revents = 0;
			m_PollFds++;

			smutils->LogMessage(myself, "Client %d connected!\n", Client);
		}
	}

	bool CompressPollFds = false;
	for(int PollFds = 1; PollFds < m_PollFds; PollFds++)
	{
		int Client = -1;
		for(Client = 0; Client < MAX_CLIENTS; Client++)
		{
			if(m_aClients[Client].m_Socket == m_aPollFds[PollFds].fd)
				break;
		}
		if(Client == -1)
			continue;

		CClient *pClient = &m_aClients[Client];

		// Connection shutdown prematurely ^C
		// Make sure to set SO_LINGER l_onoff = 1, l_linger = 0
		if(m_aPollFds[PollFds].revents & POLLHUP)
		{
			close(pClient->m_Socket);
			pClient->m_Socket = -1;
			m_aPollFds[PollFds].fd = -1;
			CompressPollFds = true;
			smutils->LogMessage(myself, "Client %d disconnected!(2)\n", Client);
			continue;
		}

		// Data available?
		if(!(m_aPollFds[PollFds].revents & POLLIN))
			continue;

		size_t BytesAvailable;
		if(ioctl(pClient->m_Socket, FIONREAD, &BytesAvailable) == -1)
			continue;

		if(pClient->m_New)
		{
			pClient->m_BufferWriteIndex = m_Buffer.GetReadIndex();
			pClient->m_New = false;
		}

		m_Buffer.SetWriteIndex(pClient->m_BufferWriteIndex);

		// Don't recv() when we can't fit data into the ringbuffer
		unsigned char aBuf[32768];
		if(min(BytesAvailable, sizeof(aBuf)) > m_Buffer.CurrentFree() * sizeof(int16_t))
			continue;

		ssize_t Bytes = recv(pClient->m_Socket, aBuf, sizeof(aBuf), 0);

		if(Bytes <= 0)
		{
			close(pClient->m_Socket);
			pClient->m_Socket = -1;
			m_aPollFds[PollFds].fd = -1;
			CompressPollFds = true;
			smutils->LogMessage(myself, "Client %d disconnected!(1)\n", Client);
			continue;
		}

		// Got data!
		OnDataReceived(pClient, (int16_t *)aBuf, Bytes / sizeof(int16_t));

		pClient->m_LastLength = m_Buffer.CurrentLength();
		pClient->m_BufferWriteIndex = m_Buffer.GetWriteIndex();
	}

	if(CompressPollFds)
	{
		for(int PollFds = 1; PollFds < m_PollFds; PollFds++)
		{
			if(m_aPollFds[PollFds].fd != -1)
				continue;

			for(int PollFds_ = PollFds; PollFds_ < 1 + MAX_CLIENTS; PollFds_++)
				m_aPollFds[PollFds_].fd = m_aPollFds[PollFds_ + 1].fd;

			PollFds--;
			m_PollFds--;
		}
	}
}

void CVoice::OnDataReceived(CClient *pClient, int16_t *pData, size_t Samples)
{
	// Check for empty input
	ssize_t DataStartsAt = -1;
	for(size_t i = 0; i < Samples; i++)
	{
		if(pData[i] == 0)
			continue;

		DataStartsAt = i;
		break;
	}

	// Discard empty data if last vaild data was more than a second ago.
	if(pClient->m_LastValidData + 1.0 < getTime())
	{
		// All empty
		if(DataStartsAt == -1)
			return;

		// Data starts here
		pData += DataStartsAt;
		Samples -= DataStartsAt;
	}

	if(!m_Buffer.Push(pData, Samples))
	{
		smutils->LogError(myself, "Buffer push failed!!! Samples: %u, Free: %u\n", Samples, m_Buffer.CurrentFree());
		return;
	}

	pClient->m_LastValidData = getTime();
}

struct SteamVoiceHeader
{
	uint32_t iSteamAccountID : 32;
	uint32_t iSteamCommunity : 32;
	uint32_t nPayload1 : 8;
	uint32_t iSampleRate : 16;
	uint32_t nPayload2 : 8;
	uint32_t iDataLength : 16;
};

void CVoice::HandleVoiceData()
{
	int SamplesPerFrame = m_EncoderSettings.FrameSize_ms * m_EncoderSettings.InputSampleRate_kHz;
	int FramesAvailable = m_Buffer.TotalLength() / SamplesPerFrame;
	float TimeAvailable = (float)m_Buffer.TotalLength() / (m_EncoderSettings.InputSampleRate_kHz * 1000.0);

	if(!FramesAvailable)
		return;

	// Before starting playback we want at least 100ms in the buffer
	if(m_AvailableTime < getTime() && TimeAvailable < 0.1)
		return;

	// let the clients have no more than 500ms
	if(m_AvailableTime > getTime() + 0.5)
		return;

	// 5 = max frames per packet
	FramesAvailable = min(FramesAvailable, 5);

	// 0 = SourceTV
	IClient *pClient = g_pSDKTools->GetIServer()->GetClient(0);
	if(!pClient)
		return;

	SteamVoiceHeader Header;
	size_t HeaderSize = 14;

	Header.iSteamAccountID = 1; // Steam Account ID
	Header.iSteamCommunity = 0x01100001; // Steam Community ID part: 0x01100001 << 32
	Header.nPayload1 = 11; // nPayLoad | Type 11 = Samplerate
	Header.iSampleRate = m_EncoderSettings.OutputSampleRate_kHz * 1000; // Samplerate
	Header.nPayload2 = 4; // nPayLoad | Type 4 = Silk Frames
	Header.iDataLength = 0; // Silk Frames total length

	// Header + Frames + CRC32
	unsigned char aFinal[HeaderSize + 8192 + sizeof(uint32_t)];
	size_t FinalSize = HeaderSize;

	for(int Frame = 0; Frame < FramesAvailable; Frame++)
	{
		// Get data into buffer from ringbuffer.
		int16_t aBuffer[SamplesPerFrame];

		size_t OldReadIdx = m_Buffer.m_ReadIndex;
		size_t OldCurLength = m_Buffer.CurrentLength();
		size_t OldTotalLength = m_Buffer.TotalLength();

		if(!m_Buffer.Pop(aBuffer, SamplesPerFrame))
		{
			smutils->LogError(myself, "Buffer pop failed!!! Samples: %u, Length: %u\n", SamplesPerFrame, m_Buffer.TotalLength());
			return;
		}

		// Frame Size
		int16_t *pFrameSize = (int16_t *)(&aFinal[FinalSize]);
		FinalSize += sizeof(int16_t);
		Header.iDataLength += sizeof(int16_t);
		*pFrameSize = sizeof(aFinal) - HeaderSize - sizeof(uint32_t) - FinalSize;

		// Encode it!
		int Ret = SKP_Silk_SDK_Encode(m_Silk_EncoderState, &m_Silk_EncoderControl, aBuffer,
			SamplesPerFrame, &aFinal[FinalSize], pFrameSize);

		if(Ret)
		{
			smutils->LogError(myself, "SKP_Silk_SDK_Encode returned %d\n", Ret);
			return;
		}

		FinalSize += *pFrameSize;
		Header.iDataLength += *pFrameSize;

		// Check for buffer underruns
		for(int Client = 0; Client < MAX_CLIENTS; Client++)
		{
			CClient *pClient = &m_aClients[Client];
			if(pClient->m_Socket == -1 || pClient->m_New == true)
				continue;

			m_Buffer.SetWriteIndex(pClient->m_BufferWriteIndex);

			if(m_Buffer.CurrentLength() > pClient->m_LastLength)
			{
				pClient->m_BufferWriteIndex = m_Buffer.GetReadIndex();
				m_Buffer.SetWriteIndex(pClient->m_BufferWriteIndex);
				pClient->m_LastLength = m_Buffer.CurrentLength();
			}
		}
	}

	// Header
	memcpy(aFinal, &Header, HeaderSize);

	// CRC32
	*(uint32_t *)(&aFinal[FinalSize]) = UTIL_CRC32(aFinal, FinalSize);
	FinalSize += sizeof(uint32_t);

	SV_BroadcastVoiceData(pClient, FinalSize, aFinal);

	if(m_AvailableTime < getTime())
		m_AvailableTime = getTime();

	m_AvailableTime += (double)FramesAvailable * ((double)m_EncoderSettings.FrameSize_ms / 1000.0);
}

void CVoice::SV_BroadcastVoiceData(IClient *pClient, int nBytes, unsigned char *pData)
{
	m_SV_BroadcastVoiceData(pClient, nBytes, pData, 0);
}