mirror of https://bitbucket.org/ausocean/av.git
278 lines
6.1 KiB
Go
278 lines
6.1 KiB
Go
/*
|
|
NAME
|
|
rtmp.go
|
|
|
|
DESCRIPTION
|
|
See Readme.md
|
|
|
|
AUTHOR
|
|
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.
|
|
*/
|
|
|
|
package rtmp
|
|
|
|
/*
|
|
#cgo CFLAGS: -I/usr/local/include/librtmp
|
|
#cgo LDFLAGS: -lrtmp -Wl,-rpath=/usr/local/lib
|
|
|
|
#include <stdlib.h>
|
|
#include <rtmp.h>
|
|
|
|
RTMP* start_session(RTMP* rtmp, char* url, uint connect_timeout);
|
|
int write_frame(RTMP* rtmp, char* data, uint data_length);
|
|
int end_session(RTMP* rtmp);
|
|
*/
|
|
import "C"
|
|
|
|
import (
|
|
"errors"
|
|
"strconv"
|
|
"unsafe"
|
|
"log"
|
|
|
|
"bitbucket.org/ausocean/av/tools"
|
|
)
|
|
|
|
// Session provides an interface for sending flv tags over rtmp.
|
|
type Session interface {
|
|
Open() error
|
|
Write([]byte) (int, error)
|
|
Close() error
|
|
}
|
|
|
|
// session provides parameters required for an rtmp communication session.
|
|
type session struct {
|
|
rtmp *C.RTMP
|
|
|
|
url string
|
|
timeout uint
|
|
}
|
|
|
|
var _ Session = (*session)(nil)
|
|
|
|
// NewSession returns a new session.
|
|
func NewSession(url string, connectTimeout uint) Session {
|
|
return &session{
|
|
url: url,
|
|
timeout: connectTimeout,
|
|
}
|
|
}
|
|
|
|
// C.AVal is in amf.h
|
|
// See #define AVC(str) {str, sizeof(str)-1} in amf.h
|
|
func AVC(str string) C.AVal {
|
|
var aval C.AVal
|
|
aval.av_val = (*C.char)(unsafe.Pointer(&([]byte(str)[0])))
|
|
aval.av_len = (C.int)(int(unsafe.Sizeof([]byte(str))-1))
|
|
return aval
|
|
}
|
|
|
|
// Open establishes an rtmp connection with the url passed into the
|
|
// constructor
|
|
func (s *session) Open() error {
|
|
if s.rtmp != nil {
|
|
return errors.New("rtmp: attempt to start already running session")
|
|
}
|
|
var err error
|
|
s.rtmp, err = C.start_session(s.rtmp, C.CString(s.url), C.uint(s.timeout))
|
|
if s.rtmp == nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
|
|
func (s *session) rtmpWrite(r *C.RTMP, buf []byte) int {
|
|
var pkt *C.RTMPPacket = &r.m_write
|
|
var pend, enc *C.char
|
|
size := len(buf)
|
|
s2 := size
|
|
var ret, num int
|
|
|
|
pkt.m_nChannel = 0x04
|
|
pkt.m_nInfoField2 = r.m_stream_id
|
|
|
|
for s2 > 0 {
|
|
if pkt.m_nBytesRead == 0 {
|
|
if size < 11 {
|
|
log.Printf("size: %d\n", size)
|
|
log.Printf("too small \n")
|
|
return 0
|
|
}
|
|
|
|
if buf[0] == 'F' && buf[1] == 'L' && buf[2] == 'V' {
|
|
// buf += 13
|
|
buf = buf[13:]
|
|
s2 -= 13
|
|
}
|
|
|
|
// pkt.m_packetType = *buf++
|
|
buf = buf[1:]
|
|
pkt.m_packetType = C.uchar(buf[0])
|
|
|
|
cChar := (*C.char)(unsafe.Pointer(&buf[0]))
|
|
pkt.m_nBodySize = C.AMF_DecodeInt24(cChar)
|
|
|
|
// C: buf+=3
|
|
buf = buf[3:]
|
|
|
|
cChar = (*C.char)(unsafe.Pointer(&buf[0]))
|
|
pkt.m_nTimeStamp = C.AMF_DecodeInt24(cChar)
|
|
|
|
// C: buf+=3
|
|
buf = buf[3:]
|
|
|
|
// C: pkt->m_nTimeStamp |= *buf++ << 24;
|
|
buf = buf[1:]
|
|
pkt.m_nTimeStamp |= C.uint( buf[0] << 24 )
|
|
|
|
// C: buf+=3
|
|
buf = buf[3:]
|
|
|
|
s2 -= 11
|
|
|
|
if ((pkt.m_packetType == C.RTMP_PACKET_TYPE_AUDIO ||
|
|
pkt.m_packetType == C.RTMP_PACKET_TYPE_VIDEO) &&
|
|
pkt.m_nTimeStamp == 0) || pkt.m_packetType == C.RTMP_PACKET_TYPE_INFO {
|
|
|
|
pkt.m_headerType = C.RTMP_PACKET_SIZE_LARGE
|
|
if pkt.m_packetType == C.RTMP_PACKET_TYPE_INFO {
|
|
pkt.m_nBodySize += 16
|
|
}
|
|
} else {
|
|
pkt.m_headerType = C.RTMP_PACKET_SIZE_MEDIUM
|
|
}
|
|
|
|
// C: if (!RTMPPacket_Alloc(pkt, pkt->m_nBodySize))
|
|
if !tools.IntToBool(int( C.RTMPPacket_Alloc(pkt, pkt.m_nBodySize))) {
|
|
log.Println("Failed to allocated packet")
|
|
return 0
|
|
}
|
|
|
|
// Note this is pointer arithmatic
|
|
enc = pkt.m_body
|
|
// pend = enc + pkt.m_nBodySize
|
|
pend = (*C.char)(unsafe.Pointer( uintptr(unsafe.Pointer(enc)) +
|
|
( unsafe.Sizeof(C.char(0x00)) * (uintptr(pkt.m_nBodySize)) ) ))
|
|
if pkt.m_packetType == C.RTMP_PACKET_TYPE_INFO {
|
|
|
|
// av_setDataFrame is a static const global in rtmp.c
|
|
av_setDataFrame := AVC("@setDataFrame")
|
|
enc = C.AMF_EncodeString(enc, pend, &av_setDataFrame )
|
|
|
|
// C-code: pkt.m_nBytesRead enc - pkt.m_body
|
|
pkt.m_nBytesRead = (C.uint)((uintptr(unsafe.Pointer(enc)) -
|
|
uintptr(unsafe.Pointer(pkt.m_body)))/unsafe.Sizeof(C.char(0x00)))
|
|
}
|
|
} else {
|
|
//C-code: enc = pkt.m_body + pkt.m_nBytesRead
|
|
enc = (*C.char)(unsafe.Pointer( uintptr(unsafe.Pointer(pkt.m_body)) +
|
|
( unsafe.Sizeof(C.char(0x00)) * (uintptr(pkt.m_nBytesRead)) ) ))
|
|
}
|
|
|
|
num = int(pkt.m_nBodySize - pkt.m_nBytesRead)
|
|
|
|
if num > s2 {
|
|
num = s2
|
|
}
|
|
// C.memcpy(enc, buf, num)
|
|
// Need to create byte slice from c array enc
|
|
encSlice := C.GoBytes(unsafe.Pointer(enc),C.int(num))
|
|
copy(encSlice,buf)
|
|
|
|
pkt.m_nBytesRead += C.uint(num)
|
|
s2 -= num
|
|
|
|
//buf += num
|
|
buf = buf[num:]
|
|
|
|
if pkt.m_nBytesRead == pkt.m_nBodySize {
|
|
ret = int(C.RTMP_SendPacket(r, pkt, 0))
|
|
C.RTMPPacket_Free(pkt)
|
|
pkt.m_nBytesRead = 0
|
|
if !tools.IntToBool(ret) {
|
|
return -1
|
|
}
|
|
// buf += 4
|
|
buf = buf[4:]
|
|
s2 -= 4
|
|
if s2 < 0 {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
return size+s2
|
|
}
|
|
|
|
|
|
func (s *session) writeFrame(data []byte) uint {
|
|
if C.RTMP_IsConnected(s.rtmp) <= 0 {
|
|
return 1
|
|
}
|
|
// This is where C.RTMP_Write would be used
|
|
if s.rtmpWrite(s.rtmp, data) <= 0 {
|
|
return 2
|
|
}
|
|
return 0
|
|
}
|
|
|
|
// Write writes a frame (flv tag) to the rtmp connection
|
|
func (s *session) Write(data []byte) (int, error) {
|
|
if s.rtmp == nil {
|
|
return 0, Err(3)
|
|
}
|
|
ret := s.writeFrame(data)
|
|
if ret != 0 {
|
|
return 0, Err(ret)
|
|
}
|
|
return len(data), nil
|
|
}
|
|
|
|
// Close terminates the rtmp connection
|
|
func (s *session) Close() error {
|
|
if s.rtmp == nil {
|
|
return Err(3)
|
|
}
|
|
ret := C.end_session(s.rtmp)
|
|
s.rtmp = nil
|
|
if ret != 0 {
|
|
return Err(ret)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
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))
|
|
}
|