av/rtmp/rtmp.go

/*
NAME
  rtmp.go

DESCRIPTION
  See Readme.md

AUTHORS
  Saxon Nelson-Milton <saxon@ausocean.org>
  Dan Kortschak <dan@ausocean.org>

LICENSE
  rtmp.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)

  It is free software: you can redistribute it and/or modify them
  under the terms of the GNU General Public License as published by the
  Free Software Foundation, either version 3 of the License, or (at your
  option) any later version.

  It 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 revid in gpl.txt. If not, see http://www.gnu.org/licenses.

  Derived from librtmp under the GNU Lesser General Public License 2.1
  Copyright (C) 2005-2008 Team XBMC http://www.xbmc.org
  Copyright (C) 2008-2009 Andrej Stepanchuk
  Copyright (C) 2009-2010 Howard Chu
*/

package rtmp

/*
#include <stdlib.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>

typedef struct sockaddr_in sockaddr_in;
typedef struct sockaddr sockaddr;
*/
import "C"

import (
	"errors"
	"fmt"
	"log"
	"math"
	"math/rand"
	"reflect"
	"strconv"
	"time"
	"unsafe"

	"github.com/chamaken/cgolmnl/inet"
)

const _Gi = 1 << 30

const (
	minDataSize = 11
	debugMode   = false
	length      = 512
)

// av_setDataFrame is a static const global in rtmp.c
var (
	AV_empty                            = AVC("")
	setDataFrame                        = AVC("@setDataFrame")
	av_connect                          = AVC("connect")
	av_app                              = AVC("app")
	av_type                             = AVC("type")
	av_nonprivate                       = AVC("nonprivate")
	av_flashVer                         = AVC("flashVer")
	av_swfUrl                           = AVC("swfUrl")
	av_tcUrl                            = AVC("tcUrl")
	av_fpad                             = AVC("fpad")
	av_capabilities                     = AVC("capabilities")
	av_audioCodecs                      = AVC("audioCodecs")
	av_videoCodecs                      = AVC("videoCodecs")
	av_videoFunction                    = AVC("videoFunction")
	av_pageUrl                          = AVC("pageUrl")
	av_objectEncoding                   = AVC("objectEncoding")
	av__result                          = AVC("_result")
	av_secureToken                      = AVC("secureToken")
	av_createStream                     = AVC("createStream")
	av_releaseStream                    = AVC("releaseStream")
	av_play                             = AVC("play")
	av_publish                          = AVC("publish")
	av_onBWDone                         = AVC("onBWDone")
	av_onFCSubscribe                    = AVC("onFCSubscribe")
	av_onFCUnsubscribe                  = AVC("onFCUnsubscribe")
	av__onbwcheck                       = AVC("_onbwcheck")
	av__onbwdone                        = AVC("_onbwdone")
	av_ping                             = AVC("ping")
	av__checkbw                         = AVC("_checkbw")
	av_close                            = AVC("close")
	av_onStatus                         = AVC("onStatus")
	av_code                             = AVC("code")
	av_level                            = AVC("level")
	av_NetStream_Failed                 = AVC("NetStream.Failed")
	av_NetStream_Play_Failed            = AVC("NetStream.Play.Failed")
	av_NetConnection_Connect_InvalidApp = AVC("NetConnection.Connect.InvalidApp")
	av_NetStream_Play_StreamNotFound    = AVC("NetStream.Play.StreamNotFound")
	av_NetStream_Play_Start             = AVC("NetStream.Play.Start")
	av_NetStream_Play_PublishNotify     = AVC("NetStream.Play.PublishNotify")
	av_NetStream_Publish_Start          = AVC("NetStream.Publish.Start")
	av_NetStream_Play_Complete          = AVC("NetStream.Play.Complete")
	av_NetStream_Play_Stop              = AVC("NetStream.Play.Stop")
	av_NetStream_Play_UnpublishNotify   = AVC("NetStream.Play.UnpublishNotify")
	av_NetStream_Seek_Notify            = AVC("NetStream.Seek.Notify")
	av_NetStream_Pause_Notify           = AVC("NetStream.Pause.Notify")
	av_playlist_ready                   = AVC("playlist_ready")
	av_set_playlist                     = AVC("set_playlist")
	av_FCPublish                        = AVC("FCPublish")
	av_live                             = AVC("live")
)

var RTMPT_cmds = []string{
	"open",
	"send",
	"idle",
	"close",
}

var (
	packetSize               = [...]int{12, 8, 4, 1}
	RTMPProtocolStringsLower = [...]string{
		"rtmp",
		"rtmpt",
		"rtmpe",
		"rtmpte",
		"rtmps",
		"rtmpts",
		"",
		"",
		"rtmfp",
	}
)

func startSession(rtmp *C_RTMP, u string, timeout uint32) (*C_RTMP, error) {
	connect_timeout := int32(timeout)
	rtmp = C_RTMP_Alloc()
	//rtmp = C.RTMP_Alloc()
	C_RTMP_Init(rtmp)
	//C.RTMP_Init(rtmp)
	rtmp.Link.timeout = connect_timeout
	if C_RTMP_SetupURL(rtmp, u) == 0 {
		// if C.RTMP_SetupURL(rtmp, C.CString(u)) == 0 {
		C_RTMP_Close(rtmp)
		//C.RTMP_Free(rtmp)
		return nil, errors.New("rtmp startSession: Failed to setup URL!")
	}

	C_RTMP_EnableWrite(rtmp)
	//C.RTMP_EnableWrite(rtmp)
	C_RTMP_SetBufferMS(rtmp, 3600*1000)
	//C.RTMP_SetBufferMS(rtmp, 3600*1000)
	if C_RTMP_Connect(rtmp, nil) == 0 {
		//if C.RTMP_Connect(rtmp, nil) == 0 {
		C_RTMP_Close(rtmp)
		//C.RTMP_Free(rtmp)
		return nil, errors.New("rtmp startSession: Failed to connect!")
	}

	// TODO: port this
	if C_RTMP_ConnectStream(rtmp, 0) == 0 {
		//if C.RTMP_ConnectStream(rtmp, 0) == 0 {
		C_RTMP_Close(rtmp)
		//C.RTMP_Free(rtmp)
		return nil, errors.New("rtmp startSession: Failed to connect stream!")
	}

	return rtmp, nil
}

func endSession(rtmp *C_RTMP) uint32 {
	if rtmp == nil {
		return 3
	}

	C_RTMP_Close(rtmp)
	//C.RTMP_Free(rtmp)
	return 0
}

// uint32_t RTMP_GetTime();
// rtmp.c +156
func C_RTMP_GetTime() int32 {
	return int32(time.Now().UnixNano() / 1000000)
}

// int RTMPPacket_Alloc(RTMPPacket* p, uint32_t nSize);
// rtmp.c +189
func C_RTMPPacket_Alloc(p *C_RTMPPacket, nSize uint32) int {
	var ptr *byte
	// TODO: port C.SIZE_MAX
	// also work out how to deal with the overfloat
	/*
		if int64(nSize) > (C.SIZE_MAX - RTMP_MAX_HEADER_SIZE) {
			return 0
		}
	*/
	ptr = (*byte)(calloc(1, uintptr(nSize+RTMP_MAX_HEADER_SIZE)))

	if ptr == nil {
		return 0
	}
	p.m_body = (*byte)(incBytePtr(unsafe.Pointer(ptr), RTMP_MAX_HEADER_SIZE))
	p.m_nBytesRead = 0
	return 1
}

// void RTMPPacket_Free(RTMPPacket* p);
// rtmp.c +203
func C_RTMPPacket_Free(p *C_RTMPPacket) {
	if p.m_body != nil {
		//C.free(decBytePtr(unsafe.Pointer(p.m_body), RTMP_MAX_HEADER_SIZE))
		p.m_body = nil
	}
}

// RTMP* RTMP_IsConnected();
// rtmp.c +317
func C_RTMP_Alloc() *C_RTMP {
	return &C_RTMP{}
	//return (*C_RTMP)(allocate(unsafe.Sizeof(r)))
}

// void RTMP_Init(RTMP *r);
// rtmp.c +329
func C_RTMP_Init(r *C_RTMP) {
	*r = C_RTMP{}
	r.m_sb.sb_socket = -1
	r.m_inChunkSize = RTMP_DEFAULT_CHUNKSIZE
	r.m_outChunkSize = RTMP_DEFAULT_CHUNKSIZE
	r.m_nBufferMS = 30000
	r.m_nClientBW = 2500000
	r.m_nClientBW2 = 2
	r.m_nServerBW = 2500000
	r.m_fAudioCodecs = 3191.0
	r.m_fVideoCodecs = 252.0
	r.Link.timeout = 30
	r.Link.swfAge = 30
}

// void RTMP_EnableWrite(RTMP *r);
// rtmp.c +351
func C_RTMP_EnableWrite(r *C_RTMP) {
	r.Link.protocol |= RTMP_FEATURE_WRITE
}

// int RTMP_IsConnected(RTMP *r);
// rtmp.c +363
func C_RTMP_IsConnected(r *C_RTMP) int32 {
	if r.m_sb.sb_socket != -1 {
		return 1
	}
	return 0
}

// void RTMP_SetBufferMS(RTMP *r, int size);
// rtmp.c +381
func C_RTMP_SetBufferMS(r *C_RTMP, size int32) {
	r.m_nBufferMS = int32(size)
}

// void SocksSetup(RTMP *r, C_AVal* sockshost);
// rtmp.c +410
func C_SocksSetup(r *C_RTMP, sockshost *C_AVal) {
	if sockshost.av_len != 0 {
		socksport := strchr((*byte)(unsafe.Pointer(sockshost.av_val)), ':')
		hostname := strdup((*byte)(unsafe.Pointer(sockshost.av_val)))

		if unsafe.Pointer(socksport) != nil {
			(*[_Gi]byte)(unsafe.Pointer(hostname))[int(uintptr(decBytePtr(unsafe.Pointer(socksport),
				int(uintptr(unsafe.Pointer(sockshost.av_val))))))] = '\000'
			r.Link.sockshost.av_val = (*byte)(unsafe.Pointer(hostname))
			r.Link.sockshost.av_len = int32(strlen(hostname))

			value, err := strconv.Atoi(string((*[_Gi]byte)(unsafe.Pointer(uintptr(
				unsafe.Pointer(socksport)) + uintptr(1)))[:int(strlen((*byte)(unsafe.Pointer(
				uintptr(unsafe.Pointer(socksport))+uintptr(1)))))+1]))
			if err != nil {
				log.Println("C_SocksSetup: bad string conversion!")
			}
			if uintptr(unsafe.Pointer(socksport)) == 0 {
				value = 1080
			}
			r.Link.socksport = uint16(value)
		}
	} else {
		r.Link.sockshost.av_val = nil
		r.Link.sockshost.av_len = 0
		r.Link.socksport = 0
	}
}

// int RTMP_SetupURL(RTMP *r, char* url);
// rtmp.c +757
// NOTE: code dealing with rtmp over http has been disregarded
func C_RTMP_SetupURL(r *C_RTMP, u string) int32 {
	url := goStrToCStr(u)

	var ret, length int32
	var port uint32
	port = 0

	length = strlen(url)
	// TODO: port this
	//ret = int32(C.RTMP_ParseURL((*byte)(unsafe.Pointer(url)), &r.Link.protocol,
	// &r.Link.hostname, (*C.uint)(&port), &r.Link.playpath0, &r.Link.app))
	ret = int32(C_RTMP_ParseURL((*byte)(unsafe.Pointer(url)), (*int32)(
		unsafe.Pointer(&r.Link.protocol)), &r.Link.hostname, (*uint32)(
		unsafe.Pointer(&port)), &r.Link.playpath0, &r.Link.app))
	if ret == 0 {
		return ret
	}

	r.Link.port = uint16(port)
	r.Link.playpath = r.Link.playpath0

	if r.Link.tcUrl.av_len == 0 {
		r.Link.tcUrl.av_val = (*byte)(unsafe.Pointer(url))
		if r.Link.app.av_len != 0 {
			if int(uintptr(unsafe.Pointer(r.Link.app.av_val))) <
				int(uintptr(incBytePtr(unsafe.Pointer(url), int(length)))) {

				r.Link.tcUrl.av_len = int32(int(r.Link.app.av_len) +
					int(uintptr(decBytePtr(unsafe.Pointer(r.Link.app.av_val),
						int(uintptr(unsafe.Pointer(url)))))))
			} else {
				length = int32(r.Link.hostname.av_len) + int32(r.Link.app.av_len) +
					int32(len("rtmpte://:65535/\x00"))

				r.Link.tcUrl.av_val = (*byte)(malloc(uintptr(uintptr(length))))
				hostname := string((*[_Gi]byte)(unsafe.Pointer(r.Link.hostname.av_val))[:int(r.Link.hostname.av_len)])

				app := string((*[_Gi]byte)(unsafe.Pointer(r.Link.app.av_val))[:int(r.Link.app.av_len)])

				fString := fmt.Sprintf("%v://%v:%v/%v",
					RTMPProtocolStringsLower[r.Link.protocol], hostname, r.Link.port, app)

				r.Link.tcUrl.av_val = (*byte)(bToUP(goStrToCStr(fString)))
				r.Link.tcUrl.av_len = int32(strLen(RTMPProtocolStringsLower[r.Link.protocol]) +
					strLen(string("://")) + strLen(hostname) + strLen(string(":")) +
					strLen(strconv.Itoa(int(r.Link.port))) + strLen(string("/")) + strLen(app))

				r.Link.lFlags |= RTMP_LF_FTCU
			}
		} else {
			r.Link.tcUrl.av_len = int32(strlen(url))
		}
	}

	C_SocksSetup(r, &r.Link.sockshost)

	if r.Link.port == 0 {
		switch {
		case (r.Link.protocol & RTMP_FEATURE_SSL) != 0:
			r.Link.port = 433
		case (r.Link.protocol & RTMP_FEATURE_HTTP) != 0:
			r.Link.port = 80
		default:
			r.Link.port = 1935
		}
	}
	return 1
}

// int add_addr_info(struct sockaddr_in *service, AVal *host, int port)
// rtmp.c +869
func C_add_addr_info(service *C.sockaddr_in, host *C_AVal, port C.int) int32 {
	var hostname *byte
	if (*[1 << 20]byte)(unsafe.Pointer(host.av_val))[host.av_len] != 0 {
		name := make([]byte, host.av_len+1)
		copy(name, (*[1 << 20]byte)(unsafe.Pointer(host.av_val))[:host.av_len])
		name[len(name)-1] = 0
		hostname = (*byte)(unsafe.Pointer(&name[0]))
	} else {
		hostname = host.av_val
	}

	service.sin_addr.s_addr = C.inet_addr((*C.char)(unsafe.Pointer(hostname)))
	if service.sin_addr.s_addr == C.INADDR_NONE {
		host := C.gethostbyname((*C.char)(unsafe.Pointer(hostname)))
		if host == nil || *host.h_addr_list == nil {
			//RTMP_Log(RTMP_LOGERROR, "Problem accessing the DNS. (addr: %s)", hostname)
			return 0
		}
		service.sin_addr = *(*C.struct_in_addr)(unsafe.Pointer(*host.h_addr_list))
	}

	service.sin_port = C.ushort(inet.Htons(uint16(port)))
	return 1
}

// int RTMP_Connect0(RTMP *r, struct sockaddr* service);
// rtmp.c +906
func C_RTMP_Connect0(r *C_RTMP, service *C.sockaddr) int {
	on := 1
	r.m_sb.sb_timedout = 0
	r.m_pausing = 0
	r.m_fDuration = 0

	r.m_sb.sb_socket = int32(C.socket(C.AF_INET, C.SOCK_STREAM, C.IPPROTO_TCP))

	if r.m_sb.sb_socket != -1 {
		if C.connect(C.int(r.m_sb.sb_socket), service, C.socklen_t(unsafe.Sizeof(*service))) < 0 {
			log.Println("C_RTMP_Connect0, failed to connect socket.")
		}

		if r.Link.socksport != 0 {
			if debugMode {
				log.Println("C_RTMP_Connect0: socks negotiation.")
			}

			//if C.SocksNegotiate(r) == 0 {
			if C_SocksNegotiate(r) == 0 {
				log.Println("C_RTMP_Connect0: SOCKS negotiation failed.")
				return 0
			}
		}
	} else {
		log.Println("C_RTMP_Connect0: failed to create socket.")
		return 0
	}

	{
		var tv int32
		SET_RCVTIMEO(&tv, int32(r.Link.timeout))
		// tv := int32(r.Link.timeout * 1000)

		if C.setsockopt(C.int(r.m_sb.sb_socket), C.SOL_SOCKET, C.SO_RCVTIMEO,
			unsafe.Pointer(&tv), C.socklen_t(unsafe.Sizeof(tv))) != 0 {
			log.Println("C_RTMP_Connect0: Setting socket timeout failed")
		}
	}

	C.setsockopt(C.int(r.m_sb.sb_socket), C.IPPROTO_TCP, C.TCP_NODELAY,
		unsafe.Pointer(&on), C.socklen_t(unsafe.Sizeof(on)))

	return 1
}

// int RTMP_Connect1(RTMP* r, RTMPPacket* cp);
// rtmp.c +978
func C_RTMP_Connect1(r *C_RTMP, cp *C_RTMPPacket) int {
	if debugMode {
		log.Println("... connected, handshaking...")
	}
	//if C.HandShake(r, 1) == 0 {
	if C_HandShake(r, 1) == 0 {
		log.Println("C_RTMP_Connect1: handshake failed!")
		return 0
	}
	if debugMode {
		log.Println("... handshaked...")
	}
	//if C.SendConnectPacket(r, cp) == 0 {
	if C_SendConnectPacket(r, cp) == 0 {
		log.Println("RTMP connect failed!")
		return 0
	}
	return 1
}

// int RTMP_Connect(RTMP *r, RTMPPacket* cp);
// rtmp.c +1032
func C_RTMP_Connect(r *C_RTMP, cp *C_RTMPPacket) int {
	// TODO: port this
	var service C.sockaddr_in

	if r.Link.hostname.av_len == 0 {
		return 0
	}
	memset((*byte)(unsafe.Pointer(&service)), 0, int(unsafe.Sizeof(service)))

	// TODO: port this
	service.sin_family = C.AF_INET

	if r.Link.socksport != 0 {
		if C_add_addr_info(&service, (*C_AVal)(unsafe.Pointer(&r.Link.sockshost)), C.int(r.Link.socksport)) == 0 {
			return 0
		}
	} else {
		// connect directly
		if C_add_addr_info(&service, (*C_AVal)(unsafe.Pointer(&r.Link.hostname)),
			C.int(r.Link.port)) == 0 {
			return 0
		}
	}
	//if C.RTMP_Connect0(r, (*C.sockaddr)(unsafe.Pointer(&service))) == 0 {
	if C_RTMP_Connect0(r, (*C.sockaddr)(unsafe.Pointer(&service))) == 0 {
		return 0
	}

	r.m_bSendCounter = 1

	return int(C_RTMP_Connect1(r, cp))
	//return int(C.RTMP_Connect1(r, cp))
}

// int SocksNegotiate(RTMP* r);
// rtmp.c +1062
func C_SocksNegotiate(r *C_RTMP) int {
	var addr int32
	var service C.sockaddr_in

	memset((*byte)(unsafe.Pointer(&service)), 0, int(unsafe.Sizeof(service)))

	C_add_addr_info(&service, (*C_AVal)(unsafe.Pointer(&r.Link.hostname)), C.int(r.Link.port))
	addr = int32(inet.Htonl(uint32(service.sin_addr.s_addr)))

	{
		packet := []byte{
			4, 1,
			byte((r.Link.port >> 8) & 0xFF),
			byte((r.Link.port) & 0xFF),
			byte(addr>>24) & 0xFF, byte(addr>>16) & 0xFF,
			byte(addr>>8) & 0xFF, byte(addr) & 0xFF,
			0,
		}

		C_WriteN(r, unsafe.Pointer(&packet[0]), int(unsafe.Sizeof(packet)))

		if C_ReadN(r, &packet[0], 8) != 8 {
			return 0
		}

		if packet[0] == 0 && packet[1] == 90 {
			return 1
		} else {
			// TODO: use new logger here
			log.Println("C_SocksNegotitate: SOCKS returned error code!")
			return 0
		}
	}
}

// int RTMP_ConnectStream(RTMP* r, int seekTime);
// rtmp.c +1099
func C_RTMP_ConnectStream(r *C_RTMP, seekTime int32) int {
	var packet C_RTMPPacket
	memset((*byte)(unsafe.Pointer(&packet)), 0, int(unsafe.Sizeof(packet)))

	if seekTime > 0 {
		r.Link.seekTime = int32(seekTime)
	}

	r.m_mediaChannel = 0

	// TODO: read packet
	for r.m_bPlaying == 0 && C_RTMP_IsConnected(r) != 0 &&
		//C.RTMP_ReadPacket(r, &packet) != 0 {
		C_RTMP_ReadPacket(r, &packet) != 0 {

		// TODO: port is ready
		if C_RTMPPacket_IsReady(&packet) != 0 {
			if packet.m_nBodySize == 0 {
				continue
			}

			if packet.m_packetType == RTMP_PACKET_TYPE_AUDIO ||
				packet.m_packetType == RTMP_PACKET_TYPE_VIDEO ||
				packet.m_packetType == RTMP_PACKET_TYPE_INFO {
				log.Println("C_RTMP_ConnectStream: got packet before play()! Ignoring.")
				C_RTMPPacket_Free(&packet)
				continue
			}

			//C.RTMP_ClientPacket(r, &packet)
			C_RTMP_ClientPacket(r, &packet)
			C_RTMPPacket_Free(&packet)
		}
	}
	return int(r.m_bPlaying)
}

// int RTMP_ClientPacket()
// rtmp.c +1226
// NOTE cases have been commented out that are not currently used by AusOcean
func C_RTMP_ClientPacket(r *C_RTMP, packet *C_RTMPPacket) int32 {
	var bHasMediaPacket int32 = 0
	switch packet.m_packetType {

	case RTMP_PACKET_TYPE_CHUNK_SIZE:
		// TODO: port this
		//C.HandleChangeChunkSize(r, packet)
		C_HandleChangeChunkSize(r, packet)

	case RTMP_PACKET_TYPE_BYTES_READ_REPORT:
		// TODO: usue new logger here
		//RTMP_Log(RTMP_LOGDEBUG, "%s, received: bytes read report", __FUNCTION__);

	case RTMP_PACKET_TYPE_CONTROL:
		panic("Unsupported packet type RTMP_PACKET_TYPE_CONTROL")
		/*
			log.Println("RTMP_PACKET_TYPE_CONTROL")
			// TODO: port this
			C.HandleCtrl(r, packet)
		*/
	case RTMP_PACKET_TYPE_SERVER_BW:
		// TODO: port this
		//C.HandleServerBW(r, packet)
		C_HandlServerBW(r, packet)

	case RTMP_PACKET_TYPE_CLIENT_BW:
		// TODO: port this
		//C.HandleClientBW(r, packet)
		C_HandleClientBW(r, packet)

	case RTMP_PACKET_TYPE_AUDIO:
		panic("Unsupported packet type RTMP_PACKET_TYPE_AUDIO")

	case RTMP_PACKET_TYPE_VIDEO:
		panic("Unsupported packet type RTMP_PACKET_TYPE_VIDEO")

	case RTMP_PACKET_TYPE_FLEX_MESSAGE:
		panic("Unsupported packet type RTMP_PACKET_TYPE_FLEX_MESSAGE")

	case RTMP_PACKET_TYPE_INFO:
		panic("Unsupported packet type RTMP_PACKET_TYPE_INFO")

	case RTMP_PACKET_TYPE_INVOKE:
		log.Println("RTMP_PACKET_TYPE_INVOKE:")
		// TODO use new logger here
		//RTMP_Log(RTMP_LOGDEBUG, "%s, received: invoke %u bytes", __FUNCTION__,packet.m_nBodySize);

		//if C.HandleInvoke(r, packet.m_body, C.uint(packet.m_nBodySize)) == 1 {
		if C_HandleInvoke(r, (*byte)(unsafe.Pointer(packet.m_body)), uint32(packet.m_nBodySize)) == 1 {
			log.Println("HasMediaPacket")
			bHasMediaPacket = 2
		}

	case RTMP_PACKET_TYPE_FLASH_VIDEO:
		panic("Unsupported packet type RTMP_PACKET_TYPE_FLASH_VIDEO")

	default:
		// TODO use new logger here
		// RTMP_Log(RTMP_LOGDEBUG, "%s, unknown packet type received: 0x%02x", __FUNCTION__,packet.m_packetType);
	}
	return bHasMediaPacket
}

// int ReadN(RTMP* r, char* buffer, int n);
// rtmp.c +1390
func C_ReadN(r *C_RTMP, buffer *byte, n int) int {
	nOriginalSize := n
	var avail int
	var ptr *byte

	r.m_sb.sb_timedout = 0

	ptr = buffer

	for n > 0 {
		nBytes := 0
		var nRead int

		avail = int(r.m_sb.sb_size)
		if avail == 0 {
			if C_RTMPSockBuf_Fill(&r.m_sb) < 1 {
				// if C.RTMPSockBuf_Fill(&r.m_sb) < 1 {
				if r.m_sb.sb_timedout == 0 {
					return 0
				}
			}
			avail = int(r.m_sb.sb_size)
		}

		if n < avail {
			nRead = n
		} else {
			nRead = avail
		}

		if nRead > 0 {
			memmove(unsafe.Pointer(ptr), unsafe.Pointer(r.m_sb.sb_start), uintptr(nRead))
			r.m_sb.sb_start = (*byte)(incBytePtr(unsafe.Pointer(r.m_sb.sb_start),
				nRead))
			r.m_sb.sb_size -= int32(nRead)
			nBytes = nRead
			r.m_nBytesIn += int32(nRead)
			if r.m_bSendCounter != 0 && r.m_nBytesIn > (r.m_nBytesInSent+
				r.m_nClientBW/10) {
				//if C.SendBytesReceived(r) == 0 {
				if C_SendBytesReceived(r) == 0 {
					return 0
				}
			}
		}

		if nBytes == 0 {
			log.Println("RTMP socket closed by peer")
			C_RTMP_Close(r)
			break
		}

		n -= nBytes
		ptr = (*byte)(incBytePtr(unsafe.Pointer(ptr), nBytes))
	}

	return nOriginalSize - n
}

// int WriteN(RTMP* r, const char* buffer, int n);
// rtmp.c +1502
func C_WriteN(r *C_RTMP, buffer unsafe.Pointer, n int) int {
	ptr := buffer
	for n > 0 {
		var nBytes int

		nBytes = int(C_RTMPSockBuf_Send(&r.m_sb, (*byte)(ptr), int32(n)))

		if nBytes < 0 {
			if debugMode {
				log.Println("C_WriteN, RTMP send error")
			}

			// TODO: port this
			C_RTMP_Close(r)
			n = 1
			break
		}

		if nBytes == 0 {
			break
		}

		n -= nBytes
		ptr = incBytePtr(ptr, nBytes)
	}

	if n == 0 {
		return 1
	}
	return 0
}

// int SendConnectPacket(RTMP* r, RTMPPacket* cp);
// rtmp.c +1579
func C_SendConnectPacket(r *C_RTMP, cp *C_RTMPPacket) int {
	var packet C_RTMPPacket
	var pbuf [4096]byte
	pend := (*byte)(unsafe.Pointer(incBytePtr(unsafe.Pointer(&pbuf[0]),
		int(unsafe.Sizeof(pbuf)))))
	var enc *byte

	if cp != nil {
		return C_RTMP_SendPacket(r, cp, 1)
		//return int(C.RTMP_SendPacket(r, cp, 1))
	}

	packet.m_nChannel = 0x03
	packet.m_headerType = RTMP_PACKET_SIZE_LARGE
	packet.m_packetType = RTMP_PACKET_TYPE_INVOKE
	packet.m_nTimeStamp = 0
	packet.m_nInfoField2 = 0
	packet.m_hasAbsTimestamp = 0
	packet.m_body = (*byte)(incBytePtr(unsafe.Pointer(&pbuf[0]),
		RTMP_MAX_HEADER_SIZE))

	enc = (*byte)(unsafe.Pointer(packet.m_body))

	//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeString((*byte)(unsafe.Pointer(enc)),
	//(*byte)(unsafe.Pointer(pend)), &av_connect)))
	enc = C_AMF_EncodeString(enc, pend, &av_connect)
	r.m_numInvokes += 1
	//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeNumber((*byte)(unsafe.Pointer(enc)),
	//(*byte)(unsafe.Pointer(pend)), float64(r.m_numInvokes))))
	enc = C_AMF_EncodeNumber(enc, pend, float64(r.m_numInvokes))

	(*[_Gi]byte)(unsafe.Pointer(enc))[0] = AMF_OBJECT

	enc = (*byte)(unsafe.Pointer(incBytePtr(unsafe.Pointer(enc), 1)))

	//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeNamedString((*byte)(
	//unsafe.Pointer(enc)), (*byte)(unsafe.Pointer(pend)), &av_app, &r.Link.app)))
	enc = C_AMF_EncodeNamedString(enc, pend, &av_app, &r.Link.app)
	if enc == nil {
		return 0
	}
	if r.Link.protocol&RTMP_FEATURE_WRITE != 0 {
		//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeNamedString((*byte)(
		//unsafe.Pointer(enc)), (*byte)(unsafe.Pointer(pend)), &av_type, &av_nonprivate)))
		enc = C_AMF_EncodeNamedString(enc, pend, &av_type, &av_nonprivate)

		if enc == nil {
			return 0
		}
	}

	if r.Link.flashVer.av_len != 0 {
		//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeNamedString((*byte)(
		//unsafe.Pointer(enc)), (*byte)(unsafe.Pointer(pend)), &av_flashVer, &r.Link.flashVer)))
		enc = C_AMF_EncodeNamedString(enc, pend, &av_flashVer, &r.Link.flashVer)
		if enc == nil {
			return 0
		}
	}
	if r.Link.swfUrl.av_len != 0 {
		//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeNamedString((*byte)(
		//	unsafe.Pointer(enc)), (*byte)(unsafe.Pointer(pend)), &av_swfUrl, &r.Link.swfUrl)))
		enc = C_AMF_EncodeNamedString(enc, pend, &av_swfUrl, &r.Link.swfUrl)
		if enc == nil {
			return 0
		}
	}

	if r.Link.tcUrl.av_len != 0 {
		//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeNamedString((*byte)(
		//unsafe.Pointer(enc)), (*byte)(unsafe.Pointer(pend)), &av_tcUrl, &r.Link.tcUrl)))
		enc = C_AMF_EncodeNamedString(enc, pend, &av_tcUrl, &r.Link.tcUrl)
		if enc == nil {
			return 0
		}
	}

	if r.Link.protocol&RTMP_FEATURE_WRITE == 0 {
		//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeNamedBoolean((*byte)(
		//unsafe.Pointer(enc)), (*byte)(unsafe.Pointer(pend)), &av_fpad, 0)))
		enc = C_AMF_EncodeNamedBoolean(enc, pend, &av_fpad, 0)
		if enc == nil {
			return 0
		}
		//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeNamedNumber((*byte)(
		//unsafe.Pointer(enc)), (*byte)(unsafe.Pointer(pend)), &av_capabilities, 15.0)))
		enc = C_AMF_EncodeNamedNumber(enc, pend, &av_capabilities, 15.0)
		if enc == nil {
			return 0
		}
		//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeNamedNumber((*byte)(
		//	unsafe.Pointer(enc)), (*byte)(unsafe.Pointer(pend)), &av_audioCodecs, r.m_fAudioCodecs)))
		enc = C_AMF_EncodeNamedNumber(enc, pend, &av_audioCodecs, float64(r.m_fAudioCodecs))
		if enc == nil {
			return 0
		}
		//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeNamedNumber((*byte)(
		//unsafe.Pointer(enc)), (*byte)(unsafe.Pointer(pend)), &av_videoCodecs, r.m_fVideoCodecs)))
		enc = C_AMF_EncodeNamedNumber(enc, pend, &av_videoCodecs, float64(r.m_fVideoCodecs))
		if enc == nil {
			return 0
		}
		//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeNamedNumber((*byte)(
		//	unsafe.Pointer(enc)), (*byte)(unsafe.Pointer(pend)), &av_videoFunction, 1.0)))
		enc = C_AMF_EncodeNamedNumber(enc, pend, &av_videoFunction, 1.0)
		if enc == nil {
			return 0
		}
		if r.Link.pageUrl.av_len != 0 {
			//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeNamedString((*byte)(
			//unsafe.Pointer(enc)), (*byte)(unsafe.Pointer(pend)), &av_pageUrl, &r.Link.pageUrl)))
			enc = C_AMF_EncodeNamedString(enc, pend, &av_pageUrl, &r.Link.pageUrl)
			if enc == nil {
				return 0
			}
		}
	}

	if r.m_fEncoding != 0.0 || r.m_bSendEncoding != 0 {
		//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeNamedNumber((*byte)(
		//unsafe.Pointer(enc)), (*byte)(unsafe.Pointer(pend)), &av_objectEncoding, r.m_fEncoding)))
		enc = C_AMF_EncodeNamedNumber(enc, pend, &av_objectEncoding, float64(r.m_fEncoding))
		if enc == nil {
			return 0
		}
	}

	if int(uintptr(incBytePtr(unsafe.Pointer(enc), 3))) >= int(uintptr(
		unsafe.Pointer(pend))) {
		return 0
	}

	(*[_Gi]byte)(unsafe.Pointer(enc))[0] = 0
	enc = (*byte)(incBytePtr(unsafe.Pointer(enc), 1))
	(*[_Gi]byte)(unsafe.Pointer(enc))[0] = 0
	enc = (*byte)(incBytePtr(unsafe.Pointer(enc), 1))
	(*[_Gi]byte)(unsafe.Pointer(enc))[0] = AMF_OBJECT_END
	enc = (*byte)(incBytePtr(unsafe.Pointer(enc), 1))

	/* add auth string */
	if r.Link.auth.av_len != 0 {
		//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeBoolean((*byte)(
		//	unsafe.Pointer(enc)), (*byte)(unsafe.Pointer(pend)), r.Link.lFlags&RTMP_LF_AUTH)))
		enc = C_AMF_EncodeBoolean(enc, pend, int(r.Link.lFlags&RTMP_LF_AUTH))
		if enc == nil {
			return 0
		}
		//enc = (*byte)(unsafe.Pointer(C.AMF_EncodeString((*byte)(unsafe.Pointer(enc)),
		//(*byte)(unsafe.Pointer(pend)), &r.Link.auth)))
		enc = C_AMF_EncodeString(enc, (*byte)(pend), &r.Link.auth)
		if enc == nil {
			return 0
		}
	}

	if r.Link.extras.o_num != 0 {
		for i := 0; i < int(r.Link.extras.o_num); i++ {
			//enc = (*byte)(unsafe.Pointer(C.AMFProp_Encode((*C_AMFObjectProperty)(
			//incPtr(unsafe.Pointer(&r.Link.extras.o_props), int(unsafe.Sizeof(
			//r.Link.extras.o_props)), i)), (*byte)(unsafe.Pointer(enc)), (*byte)(
			//unsafe.Pointer(pend)))))
			enc = C_AMF_PropEncode((*C_AMFObjectProperty)(incPtr(unsafe.Pointer(
				&r.Link.extras.o_props), int(unsafe.Sizeof(r.Link.extras.o_props)), i)),
				enc, pend)

			if enc == nil {
				return 0
			}
		}
	}

	packet.m_nBodySize = uint32(uintptr(decBytePtr(unsafe.Pointer(enc),
		int(uintptr(unsafe.Pointer(packet.m_body))))))

	//return int(C.RTMP_SendPacket(r, &packet, 1))
	return C_RTMP_SendPacket(r, &packet, 1)
}

// int RTMP_SendCreateStream(RTMP* r);
// rtmp.c +1725
func C_RTMP_SendCreateStream(r *C_RTMP) int32 {
	var packet C_RTMPPacket
	var pbuf [256]byte
	var pend *byte = (*byte)(unsafe.Pointer(uintptr(unsafe.Pointer(&pbuf[0])) +
		unsafe.Sizeof(pbuf)))
	var enc *byte

	packet.m_nChannel = 0x03 /* control channel (invoke) */
	packet.m_headerType = RTMP_PACKET_SIZE_MEDIUM
	packet.m_packetType = RTMP_PACKET_TYPE_INVOKE
	packet.m_nTimeStamp = 0
	packet.m_nInfoField2 = 0
	packet.m_hasAbsTimestamp = 0
	packet.m_body = (*byte)(incBytePtr(unsafe.Pointer(&pbuf[0]),
		int(RTMP_MAX_HEADER_SIZE)))

	enc = (*byte)(unsafe.Pointer(packet.m_body))
	enc = C_AMF_EncodeString(enc, pend, &av_createStream)
	r.m_numInvokes++
	enc = C_AMF_EncodeNumber(enc, pend, float64(r.m_numInvokes))
	*enc = AMF_NULL
	enc = (*byte)(incBytePtr(unsafe.Pointer(enc), 1))

	packet.m_nBodySize = uint32(uintptr(unsafe.Pointer(enc)) - uintptr(
		unsafe.Pointer(packet.m_body)))

	return int32(C_RTMP_SendPacket(r, &packet, 1))
}

// int SendReleaseStream(RTMP* r);
// rtmp.c +1816
func C_SendReleaseStream(r *C_RTMP) int32 {
	var packet C_RTMPPacket
	var pbuf [1024]byte
	var pend *byte = (*byte)(unsafe.Pointer(uintptr(unsafe.Pointer(&pbuf[0])) +
		unsafe.Sizeof(pbuf)))
	var enc *byte

	packet.m_nChannel = 0x03 /* control channel (invoke) */
	packet.m_headerType = RTMP_PACKET_SIZE_MEDIUM
	packet.m_packetType = RTMP_PACKET_TYPE_INVOKE
	packet.m_nTimeStamp = 0
	packet.m_nInfoField2 = 0
	packet.m_hasAbsTimestamp = 0
	packet.m_body = (*byte)(incBytePtr(unsafe.Pointer(&pbuf[0]),
		int(RTMP_MAX_HEADER_SIZE)))

	enc = (*byte)(unsafe.Pointer(packet.m_body))
	enc = C_AMF_EncodeString(enc, pend, &av_releaseStream)
	r.m_numInvokes++
	enc = C_AMF_EncodeNumber(enc, pend, float64(r.m_numInvokes))
	*enc = AMF_NULL
	enc = (*byte)(incBytePtr(unsafe.Pointer(enc), 1))
	enc = C_AMF_EncodeString(enc, pend, &r.Link.playpath)
	if enc == nil {
		return 0
	}
	packet.m_nBodySize = uint32(uintptr(unsafe.Pointer(enc)) - uintptr(
		unsafe.Pointer(packet.m_body)))

	return int32(C_RTMP_SendPacket(r, &packet, 0))
}

// int SendFCPublish(RTMP* r);
// rtmp.c +1846
func C_SendFCPublish(r *C_RTMP) int32 {
	var packet C_RTMPPacket
	var pbuf [1024]byte
	var pend *byte = (*byte)(unsafe.Pointer(uintptr(unsafe.Pointer(&pbuf[0])) +
		unsafe.Sizeof(pbuf)))
	var enc *byte

	packet.m_nChannel = 0x03 /* control channel (invoke) */
	packet.m_headerType = RTMP_PACKET_SIZE_MEDIUM
	packet.m_packetType = RTMP_PACKET_TYPE_INVOKE
	packet.m_nTimeStamp = 0
	packet.m_nInfoField2 = 0
	packet.m_hasAbsTimestamp = 0
	packet.m_body = (*byte)(incBytePtr(unsafe.Pointer(&pbuf[0]),
		int(RTMP_MAX_HEADER_SIZE)))

	enc = (*byte)(unsafe.Pointer(packet.m_body))
	enc = C_AMF_EncodeString(enc, pend, &av_FCPublish)
	r.m_numInvokes++
	enc = C_AMF_EncodeNumber(enc, pend, float64(r.m_numInvokes))
	*enc = AMF_NULL
	enc = (*byte)(incBytePtr(unsafe.Pointer(enc), 1))
	enc = C_AMF_EncodeString(enc, pend, &r.Link.playpath)
	if enc == nil {
		return 0
	}
	packet.m_nBodySize = uint32(uintptr(unsafe.Pointer(enc)) - uintptr(
		unsafe.Pointer(packet.m_body)))

	return int32(C_RTMP_SendPacket(r, &packet, 0))
}

// int SendFCUnpublish(RTMP *r);
// rtmp.c +1875
func C_SendFCUnpublish(r *C_RTMP) int32 {
	// TODO finish porting
	/*
			var packet C_RTMPPacket
			var pbuf [1024]byte
			var pend []byte = pbuf[1024:]
			var enc []byte

			packet.m_nChannel = 0x03
			packet.m_headerType = RTMP_PACKET_SIZE_MEDIUM
			packet.m_packetType = RTMP_PACKET_TYPE_INVOKE
			packet.m_nTimeStamp = 0
			packet.m_nInfoField2 = 0
			packet.m_hasAbsTimestamp = 0
			packet.m_body = pbuf + RTMP_MAX_HEADER_SIZE

			// NOTE use of unsafe pointer will be remove here when packet.m_nBody becomes []byte
			enc = []byte(unsafe.Pointer(packet.m_nBody))
			enc = C_AMF_EncodeString((*byte)(unsafe.Pointer(&enc[0])),
				(*byte)(unsafe.Pointer(&pend[0])), &av_FCUnpublish)
			r.m_numInvokes++
		  enc = C_AMF_EncodeNumber(enc, pend, r->m_numInvokes);
		  *enc++ = AMF_NULL;
		  enc = AMF_EncodeString(enc, pend, &r->Link.playpath);
		  if (!enc)
		    return FALSE;

		  packet.m_nBodySize = enc - packet.m_body;

		  return RTMP_SendPacket(r, &packet, FALSE);
	*/
	return 0
}

// int SendPublish(RTMP* r);
// rtmp.c +1908
func C_SendPublish(r *C_RTMP) int32 {
	var packet C_RTMPPacket
	var pbuf [1024]byte
	var pend *byte = (*byte)(unsafe.Pointer(uintptr(unsafe.Pointer(&pbuf[0])) +
		unsafe.Sizeof(pbuf)))
	var enc *byte

	packet.m_nChannel = 0x04 /* source channel (invoke) */
	packet.m_headerType = RTMP_PACKET_SIZE_LARGE
	packet.m_packetType = RTMP_PACKET_TYPE_INVOKE
	packet.m_nTimeStamp = 0
	packet.m_nInfoField2 = int32(r.m_stream_id)
	packet.m_hasAbsTimestamp = 0
	packet.m_body = (*byte)(incBytePtr(unsafe.Pointer(&pbuf[0]),
		int(RTMP_MAX_HEADER_SIZE)))

	enc = (*byte)(unsafe.Pointer(packet.m_body))
	enc = C_AMF_EncodeString(enc, pend, &av_publish)
	r.m_numInvokes++
	enc = C_AMF_EncodeNumber(enc, pend, float64(r.m_numInvokes))
	*enc = AMF_NULL
	enc = (*byte)(incBytePtr(unsafe.Pointer(enc), 1))
	enc = C_AMF_EncodeString(enc, pend, &r.Link.playpath)

	if enc == nil {
		return 0
	}

	enc = C_AMF_EncodeString(enc, pend, &av_live)
	if enc == nil {
		return 0
	}

	packet.m_nBodySize = uint32(uintptr(unsafe.Pointer(enc)) - uintptr(
		unsafe.Pointer(packet.m_body)))

	return int32(C_RTMP_SendPacket(r, &packet, 1))
}

// int SendBytesReceived(RTMP* r);
// rtmp.c +2080
func C_SendBytesReceived(r *C_RTMP) int {
	var packet C_RTMPPacket
	var pbuf [256]byte
	pend := (*byte)(incBytePtr(unsafe.Pointer(&pbuf[0]), 256))

	packet.m_nChannel = 0x02 /* control channel (invoke) */
	packet.m_headerType = RTMP_PACKET_SIZE_MEDIUM
	packet.m_packetType = RTMP_PACKET_TYPE_BYTES_READ_REPORT
	packet.m_nTimeStamp = 0
	packet.m_nInfoField2 = 0
	packet.m_hasAbsTimestamp = 0
	packet.m_body = (*byte)(incBytePtr(unsafe.Pointer(&pbuf[0]),
		RTMP_MAX_HEADER_SIZE))

	packet.m_nBodySize = 4

	C_AMF_EncodeInt32((*byte)(unsafe.Pointer(packet.m_body)), pend, int32(r.m_nBytesIn))
	// C.AMF_EncodeInt32(packet.m_body, (*byte)(unsafe.Pointer(pend)), r.m_nBytesIn)

	r.m_nBytesInSent = r.m_nBytesIn

	//return int(C.RTMP_SendPacket(r, &packet, 0))
	return C_RTMP_SendPacket(r, &packet, 0)
}

// int SendCheckBW(RTMP* r);
// rtmp.c +2105
func C_SendCheckBW(r *C_RTMP) int32 {
	var packet C_RTMPPacket
	var pbuf [256]byte
	var pend *byte = (*byte)(unsafe.Pointer(uintptr(unsafe.Pointer(&pbuf[0])) +
		unsafe.Sizeof(pbuf)))
	var enc *byte

	packet.m_nChannel = 0x03 /* control channel (invoke) */
	packet.m_headerType = RTMP_PACKET_SIZE_LARGE
	packet.m_packetType = RTMP_PACKET_TYPE_INVOKE
	packet.m_nTimeStamp = 0
	packet.m_nInfoField2 = 0
	packet.m_hasAbsTimestamp = 0
	packet.m_body = (*byte)(incBytePtr(unsafe.Pointer(&pbuf[0]),
		int(RTMP_MAX_HEADER_SIZE)))

	enc = (*byte)(unsafe.Pointer(packet.m_body))
	enc = C_AMF_EncodeString(enc, pend, &av__checkbw)
	r.m_numInvokes++
	enc = C_AMF_EncodeNumber(enc, pend, float64(r.m_numInvokes))
	*enc = AMF_NULL
	enc = (*byte)(incBytePtr(unsafe.Pointer(enc), 1))

	packet.m_nBodySize = uint32(uintptr(unsafe.Pointer(enc)) - uintptr(
		unsafe.Pointer(packet.m_body)))

	return int32(C_RTMP_SendPacket(r, &packet, 0))
}

// void AV_erase(C_RTMP_METHOD* vals, int* num, int i, int freeit);
// rtmp.c +2393
func C_AV_erase(vals *C_RTMP_METHOD, num *int32, i, freeit int32) {
	if freeit != 0 {
		//C.free(unsafe.Pointer((*(*C_RTMP_METHOD)(incPtr(unsafe.Pointer(vals), int(i),
		//int(unsafe.Sizeof(*vals))))).name.av_val))
	}
	(*num)--
	for ; i < *num; i++ {
		*(*C_RTMP_METHOD)(incPtr(unsafe.Pointer(vals), int(i),
			int(unsafe.Sizeof(*vals)))) = *(*C_RTMP_METHOD)(incPtr(
			unsafe.Pointer(vals), int(i+1), int(unsafe.Sizeof(*vals))))
	}
	(*(*C_RTMP_METHOD)(incPtr(unsafe.Pointer(vals), int(i),
		int(unsafe.Sizeof(*vals))))).name.av_val = nil
	(*(*C_RTMP_METHOD)(incPtr(unsafe.Pointer(vals), int(i),
		int(unsafe.Sizeof(*vals))))).name.av_len = 0
	(*(*C_RTMP_METHOD)(incPtr(unsafe.Pointer(vals), int(i),
		int(unsafe.Sizeof(*vals))))).num = 0
}

// void AV_queue(RTMP_METHOD** vals, int* num, C_AVal* av, int txn);
// rtmp.c +2414
func C_AV_queue(vals **C_RTMP_METHOD, num *int32, av *C_AVal, txn int32) {
	if (*num & 0x0f) == 0 {
		//*vals = (*C_RTMP_METHOD)(realloc(unsafe.Pointer(*vals), uint32((*num+16)*
		//int32(unsafe.Sizeof(*(*vals))))))
		*vals = (*C_RTMP_METHOD)(C.realloc(unsafe.Pointer(*vals), C.size_t((*num+16)*
			int32(unsafe.Sizeof(*(*vals))))))
	}
	tmp := malloc(uintptr(av.av_len + 1))
	//tmp := allocate(uintptr(av.av_len + 1))
	memmove(tmp, unsafe.Pointer(av.av_val), uintptr(av.av_len))
	(*[_Gi]byte)(tmp)[int(av.av_len)] = '\000'

	(*(*C_RTMP_METHOD)(incPtr(unsafe.Pointer(*vals), int(*num),
		int(unsafe.Sizeof(*(*vals)))))).num = int32(txn)
	(*(*C_RTMP_METHOD)(incPtr(unsafe.Pointer(*vals), int(*num),
		int(unsafe.Sizeof(*(*vals)))))).name.av_len = av.av_len
	(*(*C_RTMP_METHOD)(incPtr(unsafe.Pointer(*vals), int(*num),
		int(unsafe.Sizeof(*(*vals)))))).name.av_val = (*byte)(tmp)
	(*num)++
}

// int HandleInvoke(RTMP* r, const char* body, unsigned int nBodySize);
// rtmp.c +2912
func C_HandleInvoke(r *C_RTMP, body *byte, nBodySize uint32) int32 {
	var obj C_AMFObject
	var method C_AVal
	var txn float64
	var ret int32 = 0
	var nRes int32

	if *body != 0x02 {
		// TODO use new logger here
		//RTMP_Log(RTMP_LOGWARNING, "%s, Sanity failed. no string method in invoke packet",
		//__FUNCTION__);
		return 0
	}
	nRes = C_AMF_Decode(&obj, body, int32(nBodySize), 0)
	//nRes = int32(C.AMF_Decode(&obj, (*byte)(unsafe.Pointer(body)), int32(nBodySize), 0))
	if nRes < 0 {
		// TODO use new logger here
		//RTMP_Log(RTMP_LOGERROR, "%s, error decoding invoke packet", __FUNCTION__);
		return 0
	}

	// NOTE we don't really need this ?? still functions without it
	//C.AMF_Dump(&obj)
	//C.AMFProp_GetString(C_AMF_GetProp(&obj, nil, 0), &method)
	C_AMFProp_GetString(C_AMF_GetProp(&obj, nil, 0), &method)
	txn = float64(C_AMFProp_GetNumber(C_AMF_GetProp(&obj, nil, 1)))
	// TODO use new logger here
	// RTMP_Log(RTMP_LOGDEBUG, "%s, server invoking <%s>", __FUNCTION__, method.av_val);

	switch {
	case C_AVMATCH(&method, &av__result) != 0:
		{
			var methodInvoked C_AVal
			var i int32
			for i = 0; i < int32(r.m_numCalls); i++ {
				if float64((*(*C_RTMP_METHOD)(incPtr(unsafe.Pointer(r.m_methodCalls), int(i),
					int(unsafe.Sizeof(*r.m_methodCalls))))).num) == txn {
					methodInvoked = (*(*C_RTMP_METHOD)(incPtr(unsafe.Pointer(r.m_methodCalls),
						int(i), int(unsafe.Sizeof(*r.m_methodCalls))))).name
					//C.AV_erase(r.m_methodCalls, &r.m_numCalls, int32(i), 0)
					C_AV_erase(r.m_methodCalls, (*int32)(&r.m_numCalls), int32(i), 0)
					break
				}
			}
			if methodInvoked.av_val == nil {
				// TODO use new logger here
				//RTMP_Log(RTMP_LOGDEBUG, "%s, received result id %f without matching request",
				//__FUNCTION__, txn);
				goto leave
			}
			// TODO use new logger here
			//RTMP_Log(RTMP_LOGDEBUG, "%s, received result for method call <%s>", __FUNCTION__,
			//methodInvoked.av_val);
			switch {
			case C_AVMATCH(&methodInvoked, &av_connect) != 0:
				if r.Link.token.av_len != 0 {
					panic("No support for link token")

				}
				if (r.Link.protocol & RTMP_FEATURE_WRITE) != 0 {
					C_SendReleaseStream(r)
					C_SendFCPublish(r)
				} else {
					panic("Link protocol has no RTMP_FEATURE_WRITE")
				}

				C_RTMP_SendCreateStream(r)
				if (r.Link.protocol & RTMP_FEATURE_WRITE) == 0 {
					panic("Link protocol has no RTMP_FEATURE_WRITE")
				}

			case C_AVMATCH(&methodInvoked, &av_createStream) != 0:
				r.m_stream_id = int32(C_AMFProp_GetNumber(C_AMF_GetProp(&obj, nil, 3)))

				if (r.Link.protocol & RTMP_FEATURE_WRITE) != 0 {
					C_SendPublish(r)
				} else {
					panic("Link protocol has no RTMP_FEATURE_WRITE")
				}

			case C_AVMATCH(&methodInvoked, &av_play) != 0 ||
				C_AVMATCH(&methodInvoked, &av_publish) != 0:
				panic("Unsupported method av_play/av_publish")
			}
			//C.free(unsafe.Pointer(methodInvoked.av_val))
		}
	case C_AVMATCH(&method, &av_onBWDone) != 0:
		if r.m_nBWCheckCounter == 0 {
			C_SendCheckBW(r)
		}

	case C_AVMATCH(&method, &av_onFCUnsubscribe) != 0 || C_AVMATCH(&method, &av_onFCSubscribe) != 0:
		panic("Unsupported method av_onFCUnsubscribe/av_onFCSubscribe")

	case C_AVMATCH(&method, &av_ping) != 0:
		panic("Unsupported method av_ping")

	case C_AVMATCH(&method, &av__onbwcheck) != 0:
		panic("Unsupported method av_onbwcheck")

	case C_AVMATCH(&method, &av__onbwdone) != 0:
		panic("Unsupported method av_onbwdone")

	case C_AVMATCH(&method, &av_close) != 0:
		panic("Unsupported method av_close")

	case C_AVMATCH(&method, &av_onStatus) != 0:
		var obj2 C_AMFObject
		var code, level C_AVal
		C_AMFProp_GetObject(C_AMF_GetProp(&obj, nil, 3), &obj2)
		C_AMFProp_GetString(C_AMF_GetProp(&obj2, &av_code, -1), &code)
		C_AMFProp_GetString(C_AMF_GetProp(&obj2, &av_level, -1), &level)

		// TODO use new logger
		// RTMP_Log(RTMP_LOGDEBUG, "%s, onStatus: %s", __FUNCTION__, code.av_val);
		switch {
		case C_AVMATCH(&code, &av_NetStream_Failed) != 0 ||
			C_AVMATCH(&code, &av_NetStream_Play_Failed) != 0 ||
			C_AVMATCH(&code, &av_NetStream_Play_StreamNotFound) != 0 ||
			C_AVMATCH(&code, &av_NetConnection_Connect_InvalidApp) != 0:
			panic("Unsupported method av_NetStream/av_NetStream_Play_Failed/av_netSTream_Play_StreamNotFound/av_netConnection_Connect_invalidApp")

		case C_AVMATCH(&code, &av_NetStream_Play_Start) != 0 ||
			C_AVMATCH(&code, &av_NetStream_Play_PublishNotify) != 0:
			panic("Unsupported method av_NetStream_Play_Start/av_NetStream_Play_PublishNotify")

		case C_AVMATCH(&code, &av_NetStream_Publish_Start) != 0:

			var i int32
			r.m_bPlaying = 1
			for i = 0; i < int32(r.m_numCalls); i++ {
				if C_AVMATCH(&(*(*C_RTMP_METHOD)(incPtr(unsafe.Pointer(r.m_methodCalls), int(i),
					int(unsafe.Sizeof(*r.m_methodCalls))))).name, &av_publish) != 0 {
					//C.AV_erase(r.m_methodCalls, &r.m_numCalls, int32(i), 1)
					C_AV_erase(r.m_methodCalls, (*int32)(&r.m_numCalls), int32(i), 1)
					break
				}
			}

		case C_AVMATCH(&code, &av_NetStream_Play_Complete) != 0 ||
			C_AVMATCH(&code, &av_NetStream_Play_Stop) != 0 ||
			C_AVMATCH(&code, &av_NetStream_Play_UnpublishNotify) != 0:
			panic("Unsupported method av_NetStream_Play_Complete/av_NetStream_Play_Stop/av_NetStream_Play_UnpublishNotify")

		case C_AVMATCH(&code, &av_NetStream_Seek_Notify) != 0:
			panic("Unsupported method av_netStream_Seek_Notify")

		case C_AVMATCH(&code, &av_NetStream_Pause_Notify) != 0:
			panic("Unsupported method av_NetStream_Pause_Notify")
		}

	case C_AVMATCH(&method, &av_playlist_ready) != 0:
		panic("Unsupported method av_playlist_ready")

	default:
	}
leave:
	C_AMF_Reset(&obj)
	return ret
}

// void HandleChangeChunkSize(RTMP* r, const RTMPPacket* packet);
// rtmp.c +3345
func C_HandleChangeChunkSize(r *C_RTMP, packet *C_RTMPPacket) {
	if packet.m_nBodySize >= 4 {
		//r.m_inChunkSize = int32(C.AMF_DecodeInt32((*byte)(unsafe.Pointer(packet.m_body))))
		r.m_inChunkSize = int32(C_AMF_DecodeInt32((*byte)(unsafe.Pointer(packet.m_body))))
		// TODO use new logger here
		// RTMP_Log(RTMP_LOGDEBUG, "%s, received: chunk size change to %d", __FUNCTION__, r.m_inChunkSize);
	}
}

// void HandleServerBW(RTMP* r, const RTMPPacket* packet);
// rtmp.c +3508
func C_HandlServerBW(r *C_RTMP, packet *C_RTMPPacket) {
	r.m_nServerBW = int32(C_AMF_DecodeInt32((*byte)(unsafe.Pointer(packet.m_body))))
	//r.m_nServerBW = int32(C.AMF_DecodeInt32((*byte)(unsafe.Pointer(packet.m_body))))
	// TODO use new logger here
	// RTMP_Log(RTMP_LOGDEBUG, "%s: server BW = %d", __FUNCTION__, r.m_nServerBW);
}

// void HandleClientBW(RTMP* r, const RTMPPacket* packet);
// rtmp.c +3515
func C_HandleClientBW(r *C_RTMP, packet *C_RTMPPacket) {
	r.m_nClientBW = int32(C_AMF_DecodeInt32((*byte)(unsafe.Pointer(packet.m_body))))
	//r.m_nClientBW = int32(C.AMF_DecodeInt32((*byte)(unsafe.Pointer(packet.m_body))))

	if packet.m_nBodySize > 4 {
		r.m_nClientBW2 = (uint8)((*[_Gi]byte)(unsafe.Pointer(packet.m_body))[4])
	} else {
		r.m_nClientBW2 = 255
	}
	// TODO use new logger here
	// RTMP_Log(RTMP_LOGDEBUG, "%s: client BW = %d %d", __FUNCTION__, r.m_nClientBW,
	//r.m_nClientBW2);
}

// static int DecodeInt32LE(const char* data);
// rtmp.c +3527
func C_DecodeInt32LE(data *byte) int32 {
	var c *uint8 = (*uint8)(data)
	return int32(((*[_Gi]byte)(unsafe.Pointer(c))[3] << 24) |
		((*[_Gi]byte)(unsafe.Pointer(c))[2] << 16) |
		((*[_Gi]byte)(unsafe.Pointer(c))[1] << 8) |
		*c)
}

// int EncodeInt32LE(char* output, int nVal);
// rtmp.c +3537
func C_EncodeInt32LE(output *byte, nVal int32) int32 {
	*output = byte(nVal)
	nVal >>= 8
	(*[_Gi]byte)(unsafe.Pointer(output))[1] = byte(nVal)
	nVal >>= 8
	(*[_Gi]byte)(unsafe.Pointer(output))[2] = byte(nVal)
	nVal >>= 8
	(*[_Gi]byte)(unsafe.Pointer(output))[3] = byte(nVal)
	return 4
}

// int RTMP_ReadPacket(RTMP* r, RTMPPacket* packet);
// rtmp.c +3550
func C_RTMP_ReadPacket(r *C_RTMP, packet *C_RTMPPacket) int32 {
	var hbuf [RTMP_MAX_HEADER_SIZE]uint8
	memset((*byte)(&hbuf[0]), 0, RTMP_MAX_HEADER_SIZE)
	var header *byte
	header = (*byte)(unsafe.Pointer(&hbuf[0]))
	var nSize, hSize, nToRead, nChunk int32
	var extendedTimestamp int32

	if C_ReadN(r, (*byte)(&hbuf[0]), 1) == 0 {
		log.Println("C_RTMP_ReadPacket: failed to read RTMP packet header!")
		return 0
	}

	packet.m_headerType = uint8((hbuf[0] & 0xc0) >> 6)
	packet.m_nChannel = int32(hbuf[0] & 0x3f)
	header = (*byte)(incBytePtr(unsafe.Pointer(header), 1))

	switch {
	case packet.m_nChannel == 0:
		if C_ReadN(r, (*byte)(&hbuf[1]), 1) != 1 {
			log.Println("C_RTMP_ReadPacket: failed to read rtmp packet header 2nd byte.")
			return 0
		}

		packet.m_nChannel = int32(hbuf[1])
		packet.m_nChannel += 64
		header = (*byte)(incBytePtr(unsafe.Pointer(header), 1))
	case packet.m_nChannel == 1:
		var tmp int32

		if C_ReadN(r, (*byte)(&hbuf[1]), 2) != 2 {
			log.Println("C_RTMP_ReadPacket: failed to read RTMP packet 3rd byte")
			return 0
		}

		tmp = int32((hbuf[2] << 8) + hbuf[1])
		packet.m_nChannel = int32(tmp + 64)
		header = (*byte)(incBytePtr(unsafe.Pointer(header), 2))
	}

	nSize = int32(packetSize[packet.m_headerType])

	if packet.m_nChannel >= r.m_channelsAllocatedIn {
		var n int32 = int32(packet.m_nChannel + 10)
		//timestamp := (*int32)(realloc(unsafe.Pointer(r.m_channelTimestamp),
		//uint32(int32(unsafe.Sizeof(n))*n)))
		timestamp := (*int32)(C.realloc(unsafe.Pointer(r.m_channelTimestamp),
			C.size_t(int32(unsafe.Sizeof(n))*n)))

		var packetPtr *C_RTMPPacket
		//packets := (**C_RTMPPacket)(realloc(unsafe.Pointer(r.m_vecChannelsIn),
		//uint32(int32(unsafe.Sizeof(packetPtr))*n)))
		packets := (**C_RTMPPacket)(C.realloc(unsafe.Pointer(r.m_vecChannelsIn),
			C.size_t(int32(unsafe.Sizeof(packetPtr))*n)))
		if timestamp == nil {
			//C.free(unsafe.Pointer(r.m_channelTimestamp))
		}

		if packets == nil {
			//C.free(unsafe.Pointer(r.m_vecChannelsIn))
		}

		r.m_channelTimestamp = (*int32)(timestamp)
		r.m_vecChannelsIn = packets

		if timestamp == nil || packets == nil {
			r.m_channelsAllocatedIn = 0
			return 0
		}

		memset((*byte)(incPtr(unsafe.Pointer(r.m_channelTimestamp),
			int(r.m_channelsAllocatedIn), int(unsafe.Sizeof(*r.m_channelTimestamp)))),
			0, int(4*int32((n-int32(r.m_channelsAllocatedIn)))))
		memset((*byte)(incPtr(unsafe.Pointer(r.m_vecChannelsIn), int(
			r.m_channelsAllocatedIn), int(unsafe.Sizeof(*r.m_vecChannelsIn)))), 0,
			int(int32(unsafe.Sizeof(*packets))*(n-int32(r.m_channelsAllocatedIn))))
		r.m_channelsAllocatedIn = int32(n)
	}

	switch {
	case nSize == RTMP_LARGE_HEADER_SIZE:
		packet.m_hasAbsTimestamp = 1
	case nSize < RTMP_LARGE_HEADER_SIZE:
		var tmpPacketPtr *C_RTMPPacket
		if *(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsIn),
			int(packet.m_nChannel), int(unsafe.Sizeof(tmpPacketPtr)))) != nil {
			var tmpPacket C_RTMPPacket
			memmove(unsafe.Pointer(packet), unsafe.Pointer(
				*(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsIn),
					int(packet.m_nChannel), int(unsafe.Sizeof(tmpPacketPtr))))),
				unsafe.Sizeof(tmpPacket))
		}
	}

	nSize--

	if nSize > 0 && C_ReadN(r, header, int(nSize)) != int(nSize) {
		log.Println("C_RTMP_ReadPacket: failed to read rtmp packet header.")
		return 0
	}

	hSize = int32(uintptr(incBytePtr(decBytePtr(unsafe.Pointer(header), int(uintptr(
		unsafe.Pointer(&hbuf[0])))), int(nSize))))

	if nSize >= 3 {
		packet.m_nTimeStamp = uint32(C_AMF_DecodeInt24(header))

		if nSize >= 6 {
			packet.m_nBodySize = uint32(C_AMF_DecodeInt24((*byte)(incBytePtr(
				unsafe.Pointer(header), 3))))
			packet.m_nBytesRead = 0

			if nSize > 6 {
				packet.m_packetType = uint8((*[_Gi]byte)(unsafe.Pointer(header))[6])

				if nSize == 11 {
					// TODO: port this
					packet.m_nInfoField2 = int32(C_DecodeInt32LE((*byte)(incBytePtr(
						unsafe.Pointer(header), 7))))
					//packet.m_nInfoField2 = int32(C.DecodeInt32LE((*byte)(incBytePtr(
					//unsafe.Pointer(header), 7))))
				}
			}
		}
	}
	extendedTimestamp = 0
	if packet.m_nTimeStamp == 0xffffff {
		extendedTimestamp = 1
	}

	if extendedTimestamp != 0 {
		if C_ReadN(r, (*byte)(incBytePtr(unsafe.Pointer(header), int(nSize))), 4) != 4 {
			log.Println("RTMPRead_Packet: Failed to read extended timestamp")
			return 0
		}
		// TODO: port this
		packet.m_nTimeStamp = uint32(C_AMF_DecodeInt32((*byte)(incBytePtr(
			unsafe.Pointer(header), int(nSize)))))
		//packet.m_nTimeStamp = uint32(C.AMF_DecodeInt32((*byte)(incBytePtr(
		//unsafe.Pointer(header), int(nSize)))))
		hSize += 4
	}

	if packet.m_nBodySize > 0 && packet.m_body == nil {
		// TODO: port this
		if C_RTMPPacket_Alloc(packet, uint32(packet.m_nBodySize)) == 0 {
			log.Println("RTMPRead_Packet: failed to allocate packet")
			return 0
		}
		packet.m_headerType = uint8((hbuf[0] & 0xc0) >> 6)
	}

	nToRead = int32(packet.m_nBodySize - packet.m_nBytesRead)
	nChunk = int32(r.m_inChunkSize)

	if nToRead < nChunk {
		nChunk = nToRead
	}

	if packet.m_chunk != nil {
		packet.m_chunk.c_headerSize = int32(hSize)
		memmove(unsafe.Pointer(&packet.m_chunk.c_header[0]), unsafe.Pointer(&hbuf[0]),
			uintptr(hSize))
		packet.m_chunk.c_chunk = (*byte)(incBytePtr(unsafe.Pointer(packet.m_body),
			int(packet.m_nBytesRead)))
		packet.m_chunk.c_chunkSize = int32(nChunk)
	}

	if C_ReadN(r, (*byte)(incBytePtr(unsafe.Pointer(packet.m_body), int(packet.m_nBytesRead))),
		int(nChunk)) != int(nChunk) {
		log.Println("C_RTMP_ReadPacket: failed to read RTMP packet body")
		return 0
	}

	packet.m_nBytesRead += uint32(nChunk)

	var tmpPktPtr *C_RTMPPacket
	// keep the packet as ref for other packets on this channel
	if *(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsIn),
		int(packet.m_nChannel), int(unsafe.Sizeof(tmpPktPtr)))) == nil {

		var tmpPkt C_RTMPPacket
		*(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsIn), int(packet.m_nChannel),
			int(unsafe.Sizeof(tmpPktPtr)))) = (*C_RTMPPacket)(malloc(uintptr(
			unsafe.Sizeof(tmpPkt))))
	}
	memmove(unsafe.Pointer(*(**C_RTMPPacket)(incPtr(unsafe.Pointer(
		r.m_vecChannelsIn), int(packet.m_nChannel), int(unsafe.Sizeof(tmpPktPtr))))),
		unsafe.Pointer(packet), unsafe.Sizeof(tmpPktPtr))

	if extendedTimestamp != 0 {
		(*(**C_RTMPPacket)(incPtr(unsafe.Pointer(
			r.m_vecChannelsIn), int(packet.m_nChannel),
			int(unsafe.Sizeof(tmpPktPtr))))).m_nTimeStamp = 0xffffff
	}

	// TODO: port this
	if C_RTMPPacket_IsReady(packet) != 0 {
		if packet.m_hasAbsTimestamp == 0 {
			// timestamps seem to always be relative
			packet.m_nTimeStamp += *(*uint32)(incPtr(unsafe.Pointer(r.m_channelTimestamp),
				int(packet.m_nChannel), 4))
		}
		*(*uint32)(incPtr(unsafe.Pointer(r.m_channelTimestamp), int(packet.m_nChannel),
			4)) = packet.m_nTimeStamp

		(*(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsIn), int(packet.m_nChannel),
			int(unsafe.Sizeof(*r.m_vecChannelsIn))))).m_body = nil
		(*(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsIn), int(packet.m_nChannel),
			int(unsafe.Sizeof(*r.m_vecChannelsIn))))).m_nBytesRead = 0
		(*(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsIn), int(packet.m_nChannel),
			int(unsafe.Sizeof(*r.m_vecChannelsIn))))).m_hasAbsTimestamp = 0
	} else {
		packet.m_body = nil /* so it won't be erased on free */
	}
	return 1
}

// int HandShake(RTMP* r, int FP9HandShake);
// rtmp.c +3744
func C_HandShake(r *C_RTMP, FP9HandShake int32) int {
	var bMatch int
	//uptime := uint32(0)
	//suptime := uint32(0)
	//typ := byte(0)
	var uptime, suptime uint32
	var typ byte
	//clientbuf := make([]byte, RTMP_SIG_SIZE+1)
	var clientbuf [RTMP_SIG_SIZE + 1]byte
	clientsig := (*byte)(incBytePtr(unsafe.Pointer(&clientbuf[0]), 1))
	//serversig := make([]byte, RTMP_SIG_SIZE)
	var serversig [RTMP_SIG_SIZE]byte

	clientbuf[0] = 0x03 // not encrypted

	// TODO: port rtmp_getTime
	//uptime = inet.Htonl(uint32(C.RTMP_GetTime()))
	uptime = inet.Htonl(uint32(C_RTMP_GetTime()))
	memmove(unsafe.Pointer(clientsig), unsafe.Pointer(&uptime), 4)

	memset(indxBytePtr(unsafe.Pointer(clientsig), 4), 0, 4)

	for i := 8; i < RTMP_SIG_SIZE; i++ {
		(*[_Gi]byte)(unsafe.Pointer(clientsig))[i] = byte(rand.Intn(256))
	}

	if C_WriteN(r, unsafe.Pointer(&clientbuf[0]), RTMP_SIG_SIZE+1) == 0 {
		return 0
	}

	//if C.ReadN(r, (*byte)(unsafe.Pointer(&typ)), 1) != 1 {
	if C_ReadN(r, (*byte)(unsafe.Pointer(&typ)), 1) != 1 {
		return 0
	}

	if debugMode {
		log.Printf("C_HandShake: Type answer: %v\n", typ)
	}
	if typ != clientbuf[0] {
		log.Printf("C_HandShake: type mismatch: client sent %v, server sent: %v\n",
			clientbuf[0], typ)
	}
	if C_ReadN(r, (*byte)(unsafe.Pointer(&serversig[0])), RTMP_SIG_SIZE) != RTMP_SIG_SIZE {
		//if C.ReadN(r, (*byte)(unsafe.Pointer(&serversig[0])), RTMP_SIG_SIZE) != RTMP_SIG_SIZE {
		return 0
	}

	// decode server response
	memmove(unsafe.Pointer(&suptime), unsafe.Pointer(&serversig[0]), 4)
	suptime = inet.Ntohl(suptime)

	// 2nd part of handshake
	if C_WriteN(r, unsafe.Pointer(&serversig[0]), RTMP_SIG_SIZE) == 0 {
		return 0
	}

	if C_ReadN(r, (*byte)(unsafe.Pointer(&serversig[0])), RTMP_SIG_SIZE) != RTMP_SIG_SIZE {
		//if C.ReadN(r, (*byte)(unsafe.Pointer(&serversig[0])), RTMP_SIG_SIZE) != RTMP_SIG_SIZE {
		return 0
	}

	// TODO: find golang memcmp
	bMatch = 0
	if memcmp(unsafe.Pointer(&serversig[0]), unsafe.Pointer(clientsig),
		RTMP_SIG_SIZE) == 0 {
		bMatch = 1
	}

	if bMatch == 0 {
		log.Println("Client signature does not match!")
	}
	return 1
}

// int RTMP_SendPacket(RTMP* r, RTMPPacket* packet, int queue);
// rtmp.c +3896
func C_RTMP_SendPacket(r *C_RTMP, packet *C_RTMPPacket, queue int) int {
	var prevPacket *C_RTMPPacket
	last := 0
	var nSize, hSize, cSize, nChunkSize int
	var header, hptr, hend, buffer, tbuf, toff unsafe.Pointer
	var goHbuf [RTMP_MAX_HEADER_SIZE]byte
	var hbuf = unsafe.Pointer(&goHbuf[0])
	var c byte
	var t uint32
	var packets unsafe.Pointer

	if packet.m_nChannel >= r.m_channelsAllocatedOut {
		n := int(packet.m_nChannel + 10)
		packets = C.realloc(unsafe.Pointer(r.m_vecChannelsOut), C.size_t(
			unsafe.Sizeof(packet)*uintptr(n)))
		//packets = realloc(unsafe.Pointer(r.m_vecChannelsOut),
		//uint32(unsafe.Sizeof(packet)*uintptr(n)))

		if uintptr(packets) == uintptr(0) {
			//C.free(unsafe.Pointer(r.m_vecChannelsOut))
			r.m_vecChannelsOut = nil
			r.m_channelsAllocatedOut = 0
			return 0
		}
		r.m_vecChannelsOut = (**C_RTMPPacket)(packets)

		memset((*byte)(incPtr(unsafe.Pointer(r.m_vecChannelsOut), int(r.m_channelsAllocatedOut),
			int(unsafe.Sizeof(packet)))), 0, int(unsafe.Sizeof(packet)*
			uintptr(n-int(r.m_channelsAllocatedOut))))

		//memset((*byte)(incPtr(unsafe.Pointer(r.m_vecChannelsOut), int(
		//	r.m_channelsAllocatedOut), int(unsafe.Sizeof(packet)))), 0, int(
		//	unsafe.Sizeof(packet)*uintptr(n-int(r.m_channelsAllocatedOut))))
		r.m_channelsAllocatedOut = int32(n)
	}
	prevPacket = *(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsOut),
		int(packet.m_nChannel), int(unsafe.Sizeof(packet))))

	if prevPacket != nil && packet.m_headerType != RTMP_PACKET_SIZE_LARGE {
		// compress a bit by using the prev packet's attributes
		if prevPacket.m_nBodySize == packet.m_nBodySize &&
			prevPacket.m_packetType == packet.m_packetType &&
			packet.m_headerType == RTMP_PACKET_SIZE_MEDIUM {

			packet.m_headerType = RTMP_PACKET_SIZE_SMALL
		}

		if prevPacket.m_nTimeStamp == packet.m_nTimeStamp &&
			packet.m_headerType == RTMP_PACKET_SIZE_SMALL {
			packet.m_headerType = RTMP_PACKET_SIZE_MINIMUM
		}

		last = int(prevPacket.m_nTimeStamp)
	}

	if packet.m_headerType > 3 {
		log.Printf("Sanity failed! trying to send header of type: 0x%02x.",
			packet.m_headerType)
		return 0
	}

	nSize = packetSize[int(packet.m_headerType)]
	hSize = nSize
	cSize = 0
	t = uint32(int(packet.m_nTimeStamp) - last)

	if packet.m_body != nil {
		header = decBytePtr(unsafe.Pointer(packet.m_body), nSize)
		hend = unsafe.Pointer(packet.m_body)
	} else {
		header = incBytePtr(hbuf, 6)
		// TODO: be cautious about this sizeof - make sure it works how you think it
		// does. C code used sizeof(hbuf) where hbuf is a *char
		hend = incBytePtr(hbuf, RTMP_MAX_HEADER_SIZE)
	}

	switch {
	case packet.m_nChannel > 319:
		cSize = 2
	case packet.m_nChannel > 63:
		cSize = 1
	}

	if cSize != 0 {
		header = decBytePtr(header, cSize)
		hSize += cSize
	}

	if t >= 0xffffff {
		header = decBytePtr(header, 4)
		hSize += 4
		log.Printf("Larger timestamp than 24-bit: 0x%v", t)
	}

	hptr = header
	c = byte(packet.m_headerType) << 6

	switch cSize {
	case 0:
		c |= byte(packet.m_nChannel)
	case 1:
	case 2:
		c |= byte(1)
	}
	*(*byte)(hptr) = c
	hptr = incBytePtr(hptr, 1)

	if cSize != 0 {
		tmp := packet.m_nChannel - 64
		*(*byte)(hptr) = byte(tmp & 0xff)
		hptr = incBytePtr(hptr, 1)

		if cSize == 2 {
			*(*byte)(hptr) = byte(tmp >> 8)
			hptr = incBytePtr(hptr, 1)
		}
	}

	if nSize > 1 {
		res := t
		if t > 0xffffff {
			res = 0xffffff
		}
		hptr = unsafe.Pointer(C_AMF_EncodeInt24((*byte)(hptr), (*byte)(hend), int32(res)))
	}

	if nSize > 4 {
		hptr = unsafe.Pointer(C_AMF_EncodeInt24((*byte)(hptr), (*byte)(hend), (int32(packet.m_nBodySize))))
		*(*byte)(hptr) = byte(packet.m_packetType)
		hptr = incBytePtr(hptr, 1)
	}

	if nSize > 8 {
		// TODO: port this
		hptr = incBytePtr(hptr, int(C_EncodeInt32LE((*byte)(hptr),
			int32(packet.m_nInfoField2))))
		//hptr = incBytePtr(hptr, int(C.EncodeInt32LE((*byte)(hptr),
		//int32(packet.m_nInfoField2))))
	}

	if t >= 0xffffff {
		hptr = unsafe.Pointer(C_AMF_EncodeInt32((*byte)(hptr), (*byte)(hend), (int32)(t)))
	}

	nSize = int(packet.m_nBodySize)
	buffer = unsafe.Pointer(packet.m_body)
	nChunkSize = int(r.m_outChunkSize)

	if debugMode {
		log.Printf("C_RTMP_SendPacket: fd=%v, size=%v", r.m_sb.sb_socket, nSize)
	}

	for (nSize + hSize) != 0 {
		var wrote int

		if nSize < nChunkSize {
			nChunkSize = nSize
		}

		if tbuf != nil {
			//memmove(toff, header, uintptr(nChunkSize + hSize))
			copy(ptrToSlice(toff, int(nChunkSize+hSize)), ptrToSlice(header,
				int(nChunkSize+hSize)))
			toff = incBytePtr(toff, nChunkSize+hSize)
		} else {
			// TODO: port this
			wrote = int(C_WriteN(r, header, nChunkSize+hSize))

			if wrote == 0 {
				return 0
			}
		}

		nSize -= nChunkSize
		buffer = incBytePtr(buffer, nChunkSize)
		hSize = 0

		if nSize > 0 {
			header = decBytePtr(buffer, 1)
			hSize = 1

			if cSize != 0 {
				header = decBytePtr(header, cSize)
				hSize += cSize
			}

			if t >= 0xffffff {
				header = decBytePtr(header, 4)
				hSize += 4
			}

			*(*byte)(header) = byte(0xc0 | c)

			if cSize != 0 {
				tmp := int(packet.m_nChannel) - 64
				(*[_Gi]byte)(header)[1] = byte(tmp & 0xff)

				if cSize == 2 {
					(*[_Gi]byte)(header)[2] = byte(tmp >> 8)
				}
			}
			if t >= 0xffffff {
				extendedTimestamp := incBytePtr(header, 1+cSize)
				C_AMF_EncodeInt32((*byte)(extendedTimestamp),
					(*byte)(incBytePtr(extendedTimestamp, 4)), (int32)(t))
			}
		}
	}

	if tbuf != nil {
		wrote := int(C_WriteN(r, tbuf, int(uintptr(decBytePtr(toff,
			int(uintptr(unsafe.Pointer(tbuf))))))))
		////C.free(tbuf)
		tbuf = nil

		if wrote == 0 {
			return 0
		}
	}

	// We invoked a remote method
	// TODO: port the const
	if packet.m_packetType == RTMP_PACKET_TYPE_INVOKE {
		// TODO: port C_AVal
		var method C_AVal
		var ptr unsafe.Pointer
		ptr = incBytePtr(unsafe.Pointer(packet.m_body), 1)
		//C.AMF_DecodeString((*byte)(ptr), &method)
		C_AMF_DecodeString((*byte)(ptr), &method)

		if debugMode {
			log.Printf("Invoking %v", method.av_val)
		}
		// keep it in call queue till result arrives
		if queue != 0 {
			var txn int
			ptr = incBytePtr(ptr, 3+int(method.av_len))
			//txn = int(C.AMF_DecodeNumber((*byte)(ptr)))
			txn = int(C_AMF_DecodeNumber((*byte)(ptr)))
			C_AV_queue(&r.m_methodCalls, (*int32)(unsafe.Pointer(&r.m_numCalls)),
				&method, int32(txn))
			//C.AV_queue(&r.m_methodCalls, (*int32)(unsafe.Pointer(&r.m_numCalls)), &method,
			//int32(txn))
		}
	}

	if *(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsOut),
		int(packet.m_nChannel), int(unsafe.Sizeof(packet)))) == nil {

		*(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsOut),
			int(packet.m_nChannel), int(unsafe.Sizeof(packet)))) =
			(*C_RTMPPacket)(malloc(uintptr(unsafe.Sizeof(*packet))))
	}

	memmove(unsafe.Pointer(*(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsOut),
		int(packet.m_nChannel), int(unsafe.Sizeof(packet))))), unsafe.Pointer(packet),
		uintptr(unsafe.Sizeof(*packet)))
	return 1
}

// void RTMP_Close(RTMP *r);
// rtmp.c +4168
func C_RTMP_Close(r *C_RTMP) {
	C_CloseInternal(r, 0)
}

// static void CloseInternal(RTMP *r, int reconnect);
// rtmp.c +4175
func C_CloseInternal(r *C_RTMP, reconnect int32) {
	// TODO: port SendFCUnpublish
	// TODO: port SendDeleteStream
	// TODO: port RTMPSockBuf_Close
	// TODO: port AV_Clear
	/*
		var i int32

		if C_RTMP_IsConnected(r) != 0 {
			if r.m_stream_id > 0 {
				i = int32(r.m_stream_id)
				if r.Link.protocol&RTMP_FEATURE_WRITE != 0 {
					C.SendFCUnpublish(r)
				}
				C.SendDeleteStream(r, float64(i))
			}
			C.RTMPSockBuf_Close(&r.m_sb)
		}

		r.m_stream_id = -1
		r.m_sb.sb_socket = -1
		r.m_nBWCheckCounter = 0
		r.m_nBytesIn = 0
		r.m_nBytesInSent = 0

		if r.m_read.flags&RTMP_READ_HEADER != 0 {
			//C.free(unsafe.Pointer(r.m_read.buf))
			r.m_read.buf = nil
		}

		r.m_read.dataType = 0
		r.m_read.flags = 0
		r.m_read.status = 0
		r.m_read.nResumeTS = 0
		r.m_read.nIgnoredFrameCounter = 0
		r.m_read.nIgnoredFlvFrameCounter = 0

		r.m_write.m_nBytesRead = 0
		C.RTMPPacket_Free(&r.m_write)

		// NOTE: C frees - not using in our case
			for i := 0; i < int(r.m_channelsAllocatedIn); i++ {
				if *(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsIn), i,
					int(unsafe.Sizeof(&r.m_write)))) != nil {

					//C.RTMPPacket_Free(*(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsIn), i,
						//int(unsafe.Sizeof(&r.m_write)))))

					//C.free(unsafe.Pointer(*(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsIn),
					//i, int(unsafe.Sizeof(&r.m_write))))))

					*(**C_RTMPPacket)(incPtr(unsafe.Pointer(r.m_vecChannelsIn),
						i, int(unsafe.Sizeof(&r.m_write)))) = nil
				}
			}


		//C.free(unsafe.Pointer(r.m_vecChannelsOut))
		r.m_vecChannelsOut = nil
		r.m_channelsAllocatedOut = 0
		C.AV_clear(r.m_methodCalls, r.m_numCalls)

		r.m_methodCalls = nil
		r.m_numCalls = 0
		r.m_numInvokes = 0

		r.m_bPlaying = C.uchar(0)
		r.m_sb.sb_size = 0

		r.m_msgCounter = 0
		r.m_resplen = 0
		r.m_unackd = 0

		if ((r.Link.lFlags & RTMP_LF_FTCU) != 0) && (reconnect == 0) {
			//C.free(unsafe.Pointer(r.Link.app.av_val))
			r.Link.app.av_val = nil
			r.Link.lFlags ^= RTMP_LF_FAPU
		}

		if reconnect == 0 {
			//C.free(unsafe.Pointer(r.Link.playpath0.av_val))
			r.Link.playpath0.av_val = nil
		}
	*/
}

// int RTMPSockBuf_Fill(RTMPSockBuf* sb);
// rtmp.c +4253
func C_RTMPSockBuf_Fill(sb *C_RTMPSockBuf) int {
	var nBytes int

	if sb.sb_size == 0 {
		sb.sb_start = &sb.sb_buf[0]
	}

	for {
		nBytes = int(unsafe.Sizeof(sb.sb_buf)) - 1 - int(sb.sb_size) -
			int(uintptr(unsafe.Pointer(sb.sb_start))-uintptr(unsafe.Pointer(
				&sb.sb_buf[0])))

		// TODO: figure out what to do with recv
		nBytes = int(C.recv(C.int(sb.sb_socket), unsafe.Pointer(uintptr(unsafe.Pointer(
			sb.sb_start))+uintptr(int(sb.sb_size))), C.size_t(nBytes), 0))

		if nBytes != -1 {
			sb.sb_size += int32(nBytes)
		} else {
			log.Println("C_RTMPSockBuf_Fill: recv error!")
		}
		break
	}
	return nBytes
}

// int RTMPSockBuf_Send(RTMPSockBuf* sb, const char* buf, int len);
// rtmp.c +4297
// TODO replace send with golang net connection send
func C_RTMPSockBuf_Send(sb *C_RTMPSockBuf, buf *byte, l int32) int32 {
	return int32(C.send(C.int(sb.sb_socket), unsafe.Pointer(buf), C.size_t(l), 0))
}

// int RTMP_Write(RTMP* r, const char* buf, int size);
// rtmp.c +5095
func C_RTMP_Write(r *C_RTMP, data []byte) int {
	buf := sliceToPtr(data)
	// TODO: port RTMPPacket
	var pkt = &r.m_write
	var pend, enc unsafe.Pointer
	size := len(data)
	s2 := size
	var ret, num int

	pkt.m_nChannel = 0x04
	pkt.m_nInfoField2 = int32(r.m_stream_id)
	for s2 != 0 {
		if pkt.m_nBytesRead == 0 {
			if size < minDataSize {
				log.Printf("size: %d\n", size)
				log.Printf("too small \n")
				return 0
			}

			if (*[_Gi]byte)(buf)[0] == 'F' && (*[_Gi]byte)(buf)[1] == 'L' && (*[_Gi]byte)(buf)[2] == 'V' {
				buf = unsafe.Pointer(uintptr(buf) + uintptr(13))
				s2 -= 13
			}

			pkt.m_packetType = uint8((*[_Gi]byte)(buf)[0])
			buf = incBytePtr(buf, 1)
			pkt.m_nBodySize = uint32(C_AMF_DecodeInt24((*byte)(buf)))
			buf = incBytePtr(buf, 3)
			pkt.m_nTimeStamp = uint32(C_AMF_DecodeInt24((*byte)(buf)))
			buf = incBytePtr(buf, 3)
			pkt.m_nTimeStamp |= uint32((*[_Gi]byte)(buf)[0]) << 24
			buf = incBytePtr(buf, 4)
			s2 -= 11

			if ((pkt.m_packetType == RTMP_PACKET_TYPE_AUDIO ||
				pkt.m_packetType == RTMP_PACKET_TYPE_VIDEO) &&
				pkt.m_nTimeStamp == 0) || pkt.m_packetType == RTMP_PACKET_TYPE_INFO {

				pkt.m_headerType = RTMP_PACKET_SIZE_LARGE

				if pkt.m_packetType == RTMP_PACKET_TYPE_INFO {
					pkt.m_nBodySize += 16
				}
			} else {
				pkt.m_headerType = RTMP_PACKET_SIZE_MEDIUM
			}
			// TODO: Port this
			if int(C_RTMPPacket_Alloc(pkt, uint32(pkt.m_nBodySize))) == 0 {
				log.Println("Failed to allocate packet")
				return 0
			}

			enc = unsafe.Pointer(pkt.m_body)
			pend = incBytePtr(enc, int(pkt.m_nBodySize))

			if pkt.m_packetType == RTMP_PACKET_TYPE_INFO {
				enc = unsafe.Pointer(C_AMF_EncodeString((*byte)(enc), (*byte)(pend), &setDataFrame))
				pkt.m_nBytesRead = uint32(math.Abs(float64(uintptr(enc) -
					uintptr(unsafe.Pointer(pkt.m_body)))))
			}

		} else {
			enc = incBytePtr(unsafe.Pointer(pkt.m_body), int(pkt.m_nBytesRead))
		}
		num = int(pkt.m_nBodySize - pkt.m_nBytesRead)
		if num > s2 {
			num = s2
		}

		memmove(enc, buf, uintptr(num))
		pkt.m_nBytesRead += uint32(num)
		s2 -= num
		buf = incBytePtr(buf, num)
		if pkt.m_nBytesRead == pkt.m_nBodySize {
			// TODO: Port this
			ret = C_RTMP_SendPacket(r, pkt, 0)
			// TODO: Port this
			//C.RTMPPacket_Free(pkt)
			C_RTMPPacket_Free(pkt)
			pkt.m_nBytesRead = 0
			if ret == 0 {
				return -1
			}
			buf = incBytePtr(buf, 4)
			s2 -= 4
			if s2 < 0 {
				break
			}
		}
	}
	return size + s2
}

/*
func realloc(ptr unsafe.Pointer, newSize uint32) unsafe.Pointer {
	return unsafe.Pointer(crt.Xrealloc(crt.TLS(uintptr(unsafe.Pointer(nil))),
		uintptr(ptr), uint32(newSize)))
}
*/

func memmove(to, from unsafe.Pointer, n uintptr) {
	if to != nil && from != nil && n != 0 {
		copy(ptrToSlice(to, int(n)), ptrToSlice(from, int(n)))
	}
}

// TODO: write test for this func
func memcmp(a, b unsafe.Pointer, size int) int {
	for i := 0; i < size; i++ {
		aValue := (*[_Gi]byte)(a)[i]
		bValue := (*[_Gi]byte)(b)[i]
		if aValue != bValue {
			if aValue < bValue {
				return -1
			} else {
				return 1
			}
		}
	}
	return 0
}

func memset(ptr *byte, val int, num int) {
	for i := 0; i < num; i++ {
		(*[_Gi]byte)(unsafe.Pointer(ptr))[int(i)] = byte(uint8(val))
	}
}

func strLen(str string) int {
	return len(str)
}

// wrapper for converting byte pointer to unsafe.Pointer
func bToUP(b *byte) unsafe.Pointer {
	return unsafe.Pointer(b)
}

// Creates a new C style string from a go string
func goStrToCStr(str string) *byte {
	l := len(str)
	slice := make([]byte, l+1)
	ptr := unsafe.Pointer(&[]byte(str)[0])
	for i := 0; i < l; i++ {
		slice[i] = (*[_Gi]byte)(ptr)[i]
	}
	slice[l] = '\x00'
	return &slice[0]
}

// TODO: need a test in rtmp_test.go
func cStrToGoStr(cStr *byte) string {
	return string((*[_Gi]byte)(unsafe.Pointer(cStr))[:int(strlen(cStr))])
}

// Duplicates a string given as a byte pointer
func strdup(str *byte) *byte {
	length := strlen(str)
	newMem := make([]byte, length+1)
	oldMem := (*[_Gi]byte)(unsafe.Pointer(str))[:int(length+1)]
	copy(newMem, oldMem)
	return &newMem[0]
}

// Gets the length of the string found at str - length is number of chars
// between start and terminating null char. Returns -1 if a null char is not
// found before a count of 1000
func strlen(str *byte) int32 {
	var ptr *byte
	for i := 0; i < 1000; i++ {
		ptr = indxBytePtr(unsafe.Pointer(str), i)
		if *ptr == '\000' {
			return int32(i)
		}
	}
	return int32(-1)
}

// Returns the pointer where the first occurance of val is located in a string
// which is terminated by a null char. Returns nil if null char is not found
// before a count of 10000
func strchr(str *byte, val byte) *byte {
	var ptr *byte
	for i := 0; i < 1000; i++ {
		ptr = indxBytePtr(unsafe.Pointer(str), i)
		if *ptr == val {
			return ptr
		}
		if *ptr == '\000' {
			break
		}
	}
	return nil
}

// TODO: need a test in rtmp_test.go
// Porting: http://www.ai.mit.edu/projects/im/cam8/cam8/working/CAMlib/tcl/compat/strstr.c
func strstr(str *byte, substring *byte) *byte {
	var a, b *byte
	/* First scan quickly through the two strings looking for a
	 * single-character match.  When it's found, then compare the
	 * rest of the substring.
	 */

	b = substring
	if *b == 0 {
		return str
	}

	for *str != 0 {
		str = (*byte)(incBytePtr(unsafe.Pointer(str), 1))
		if *str != *b {
			continue
		}
		a = str
		for {
			if *b == 0 {
				return str
			}
			tmp1 := a
			a = (*byte)(incBytePtr(unsafe.Pointer(a), 1))
			tmp2 := b
			b = (*byte)(incBytePtr(unsafe.Pointer(b), 1))
			if *tmp1 != *tmp2 {
				break
			}
		}
		b = substring
	}
	return nil
}

// Creates mem of the size noOfBytes. returns as unsafe pointer
func malloc(nOfBytes uintptr) unsafe.Pointer {
	mem := make([]byte, int(nOfBytes))
	return unsafe.Pointer(&mem[0])
}

func calloc(val byte, noOfBytes uintptr) unsafe.Pointer {
	mem := malloc(noOfBytes)
	memset((*byte)(mem), int(val), int(noOfBytes))
	return mem
}

// indxBytePtr returns a byte at the indx inc give a ptr
func indxBytePtr(ptr unsafe.Pointer, inc int) *byte {
	return (*byte)(incPtr(ptr, inc, 1))
}

// incBytePtr returns an unsafe.Pointer to a byte that is inc positive positions
// from the passed ptr
func incBytePtr(ptr unsafe.Pointer, inc int) unsafe.Pointer {
	return incPtr(ptr, inc, 1)
}

// incPtr attempts to replicate C like pointer arithmatic functionality
func incPtr(ptr unsafe.Pointer, inc, typeSize int) unsafe.Pointer {
	return unsafe.Pointer(uintptr(ptr) + uintptr(inc*typeSize))
}

// incPtr attempts to replicate C like pointer arithmatic functionality
func decPtr(ptr unsafe.Pointer, dec, typeSize int) unsafe.Pointer {
	return unsafe.Pointer(uintptr(ptr) - uintptr(dec*typeSize))
}

// decBytePtr returns an unsafe.Pointer to a byte that is dec negative positions
// from ptr
func decBytePtr(ptr unsafe.Pointer, dec int) unsafe.Pointer {
	return decPtr(ptr, dec, 1)
}

// sliceToPtr get's the address of the first data element and returns as unsafe
// pointer
func sliceToPtr(data []byte) unsafe.Pointer {
	if len(data) == 0 {
		return nil
	}
	return unsafe.Pointer(&data[0])
}

// ptrToSlice returns a slice given unsafe pointer and size - no allocation and
// copying is required - same data is used.
func ptrToSlice(data unsafe.Pointer, size int) []byte {
	var ret []byte
	shDest := (*reflect.SliceHeader)(unsafe.Pointer(&ret))
	shDest.Data = uintptr(data)
	shDest.Len = size
	shDest.Cap = size
	return ret
}

var rtmpErrs = [...]string{
	1: "rtmp: not connected",
	2: "rtmp: write error",
	3: "rtmp: not started",
}

type Err uint

func (e Err) Error() string {
	if 0 <= int(e) && int(e) < len(rtmpErrs) {
		s := rtmpErrs[e]
		if s != "" {
			return s
		}
	}
	return "rtmp: " + strconv.Itoa(int(e))
}