av/rtmp/amf.go

679 lines
16 KiB
Go

/*
NAME
amf.go
DESCRIPTION
See Readme.md
AUTHORS
Saxon Nelson-Milton <saxon@ausocean.org>
Dan Kortschak <dan@ausocean.org>
Jake Lane <jake@ausocean.org>
LICENSE
amf.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>
*/
import "C"
import (
"encoding/binary"
"log"
"math"
"unsafe"
)
var (
AMFObj_Invalid C_AMFObject
AMFProp_Invalid = C_AMFObjectProperty{p_type: AMF_INVALID}
)
const (
AMF3_INTEGER_MAX = 268435455
AMF3_INTEGER_MIN = -268435456
)
func pp2b(b, e *byte) []byte {
if b == nil {
return nil
}
base := unsafe.Pointer(b)
len := uintptr(unsafe.Pointer(e)) - uintptr(base)
return (*[_Gi]byte)(base)[:len]
}
func pl2b(b *byte, l int) []byte {
if b == nil {
return nil
}
base := unsafe.Pointer(b)
return (*[_Gi]byte)(base)[:l]
}
func b2pp(buf []byte) (b, e *byte) {
if buf == nil {
return nil, nil
}
if len(buf) == 0 {
b = *(**byte)(unsafe.Pointer(&buf))
return b, b
}
b = &buf[0]
e = (*byte)(unsafe.Pointer(uintptr(unsafe.Pointer(b)) + uintptr(len(buf))))
return b, e
}
func bAddr(buf []byte) *byte {
if len(buf) == 0 {
return nil
}
return &buf[0]
}
// unsigned short AMF_DecodeInt16(const char* data);
// amf.c +41
func C_AMF_DecodeInt16(data []byte) uint16 {
return uint16(data[0])<<8 | uint16(data[1])
}
// unsigned int AMF_DecodeInt24(const char* data);
// amf.c +50
func C_AMF_DecodeInt24(data []byte) uint32 {
return uint32(data[0])<<16 | uint32(data[1])<<8 | uint32(data[2])
}
// unsigned int AMF_DeocdeInt32(const char* data);
// amf.c +59
func C_AMF_DecodeInt32(data []byte) uint32 {
return uint32(data[0])<<24 | uint32(data[1])<<16 | uint32(data[2])<<8 | uint32(data[3])
}
// void AMF_DecodeString(const char* data, C_AVal* bv);
// amf.c +68
func C_AMF_DecodeString(data []byte) string {
n := C_AMF_DecodeInt16(data)
return string(data[2 : 2+n])
}
// void AMF_DecodeLongString(const char *data, AVal *bv);
// amf.c +75
func C_AMF_DecodeLongString(data []byte) string {
n := C_AMF_DecodeInt32(data)
return string(data[2 : 2+n])
}
// double AMF_DecodeNumber(const char* data);
// amf.c +82
func C_AMF_DecodeNumber(data []byte) float64 {
return math.Float64frombits(binary.BigEndian.Uint64(data))
}
// int AMF_DecodeBoolean(const char *data);
// amf.c +132
func C_AMF_DecodeBoolean(data []byte) bool {
return data[0] != 0
}
// char* AMF_EncodeInt24(char* output, char* outend, int nVal);
// amf.c +149
func C_AMF_EncodeInt24(dst []byte, val int32) []byte {
if len(dst) < 3 {
return nil
}
_ = dst[2]
dst[0] = byte(val >> 16)
dst[1] = byte(val >> 8)
dst[2] = byte(val)
if len(dst) == 3 {
return nil
}
return dst[3:]
}
// char* AMF_EncodeInt32(char* output, char* outend, int nVal);
// amf.c +160
func C_AMF_EncodeInt32(dst []byte, val int32) []byte {
if len(dst) < 4 {
return nil
}
binary.BigEndian.PutUint32(dst, uint32(val))
if len(dst) == 4 {
return nil
}
return dst[4:]
}
// char* AMF_EncodeString(char* output, char* outend, const C_AVal* bv);
// amf.c +173
func C_AMF_EncodeString(dst []byte, val string) []byte {
const typeSize = 1
if len(val) < 65536 && len(val)+typeSize+binary.Size(int16(0)) > len(dst) {
return nil
}
if len(val)+typeSize+binary.Size(int32(0)) > len(dst) {
return nil
}
if len(val) < 65536 {
dst[0] = AMF_STRING
dst = dst[1:]
binary.BigEndian.PutUint16(dst[:2], uint16(len(val)))
dst = dst[2:]
copy(dst, val)
if len(dst) == len(val) {
return nil
}
return dst[len(val):]
}
dst[0] = AMF_LONG_STRING
dst = dst[1:]
binary.BigEndian.PutUint32(dst[:4], uint32(len(val)))
dst = dst[4:]
copy(dst, val)
if len(dst) == len(val) {
return nil
}
return dst[len(val):]
}
// char* AMF_EncodeNumber(char* output, char* outend, double dVal);
// amf.c +199
func C_AMF_EncodeNumber(dst []byte, val float64) []byte {
if len(dst) < 9 {
return nil
}
dst[0] = AMF_NUMBER
dst = dst[1:]
binary.BigEndian.PutUint64(dst, math.Float64bits(val))
return dst[8:]
}
// char* AMF_EncodeBoolean(char* output, char* outend, int bVal);
// amf.c +260
func C_AMF_EncodeBoolean(dst []byte, val bool) []byte {
if len(dst) < 2 {
return nil
}
dst[0] = AMF_BOOLEAN
if val {
dst[1] = 1
}
if len(dst) == 2 {
return nil
}
return dst[2:]
}
// char* AMF_EncodeNamedString(char* output, char* outend, const C_AVal* strName, const C_AVal* strValue);
// amf.c +273
func C_AMF_EncodeNamedString(dst []byte, key, val string) []byte {
if 2+len(key) > len(dst) {
return nil
}
binary.BigEndian.PutUint16(dst[:2], uint16(len(key)))
dst = dst[2:]
copy(dst, key)
if len(key) == len(dst) {
return nil
}
return C_AMF_EncodeString(dst[len(key):], val)
}
// char* AMF_EncodeNamedNumber(char* output, char* outend, const C_AVal* strName, double dVal);
// amf.c +286
func C_AMF_EncodeNamedNumber(dst []byte, key string, val float64) []byte {
if 2+len(key) > len(dst) {
return nil
}
binary.BigEndian.PutUint16(dst[:2], uint16(len(key)))
dst = dst[2:]
copy(dst, key)
if len(key) == len(dst) {
return nil
}
return C_AMF_EncodeNumber(dst[len(key):], val)
}
// char* AMF_EncodeNamedBoolean(char* output, char* outend, const C_AVal* strname, int bVal);
// amf.c +299
func C_AMF_EncodeNamedBoolean(dst []byte, key string, val bool) []byte {
if 2+len(key) > len(dst) {
return nil
}
binary.BigEndian.PutUint16(dst[:2], uint16(len(key)))
dst = dst[2:]
copy(dst, key)
if len(key) == len(dst) {
return nil
}
return C_AMF_EncodeBoolean(dst[len(key):], val)
}
// void AMFProp_SetName(AMFObjectProperty *prop, AVal *name);
// amf.c +318
func C_AMFProp_SetName(prop *C_AMFObjectProperty, name string) {
prop.p_name = name
}
// double AMFProp_GetNumber(AMFObjectProperty* prop);
// amf.c +330
func C_AMFProp_GetNumber(prop *C_AMFObjectProperty) float64 {
return prop.p_vu.p_number
}
// void AMFProp_GetString(AMFObjectProperty* prop, AVal* str);
// amf.c +341
func C_AMFProp_GetString(prop *C_AMFObjectProperty) string {
if prop.p_type == AMF_STRING {
return prop.p_vu.p_aval
}
return ""
}
// void AMFProp_GetObject(AMFObjectProperty *prop, AMFObject *obj);
// amf.c +351
func C_AMFProp_GetObject(prop *C_AMFObjectProperty, obj *C_AMFObject) {
if prop.p_type == AMF_OBJECT {
*obj = prop.p_vu.p_object
} else {
*obj = AMFObj_Invalid
}
}
// char* AMFPropEncode(AMFOBjectProperty* prop, char* pBufer, char* pBufEnd);
// amf.c +366
func C_AMF_PropEncode(p *C_AMFObjectProperty, dst []byte) []byte {
if p.p_type == AMF_INVALID {
return nil
}
if p.p_type != AMF_NULL && len(p.p_name)+2+1 >= len(dst) {
return nil
}
if p.p_type != AMF_NULL && len(p.p_name) != 0 {
binary.BigEndian.PutUint16(dst[:2], uint16(len(p.p_name)))
dst = dst[2:]
copy(dst, p.p_name)
dst = dst[len(p.p_name):]
}
switch p.p_type {
case AMF_NUMBER:
dst = C_AMF_EncodeNumber(dst, p.p_vu.p_number)
case AMF_BOOLEAN:
dst = C_AMF_EncodeBoolean(dst, p.p_vu.p_number != 0)
case AMF_STRING:
dst = C_AMF_EncodeString(dst, p.p_vu.p_aval)
case AMF_NULL:
if len(dst) < 2 {
return nil
}
dst[0] = AMF_NULL
dst = dst[1:]
case AMF_OBJECT:
dst = C_AMF_Encode(&p.p_vu.p_object, dst)
case AMF_ECMA_ARRAY:
dst = C_AMF_EncodeEcmaArray(&p.p_vu.p_object, dst)
case AMF_STRICT_ARRAY:
dst = C_AMF_EncodeArray(&p.p_vu.p_object, dst)
default:
log.Println("C_AMF_PropEncode: invalid type!")
dst = nil
}
return dst
}
// int AMFProp_Decode(C_AMFObjectProperty* prop, const char* pBuffer, int nSize, int bDecodeName);
// amf.c +619
func C_AMFProp_Decode(prop *C_AMFObjectProperty, data []byte, bDecodeName int32) int32 {
prop.p_name = ""
nOriginalSize := len(data)
if len(data) == 0 {
// TODO use new logger here
// RTMP_Log(RTMP_LOGDEBUG, "%s: Empty buffer/no buffer pointer!", __FUNCTION__);
return -1
}
if bDecodeName != 0 && len(data) < 4 {
// at least name (length + at least 1 byte) and 1 byte of data
// TODO use new logger here
// RTMP_Log(RTMP_LOGDEBUG, "%s: Not enough data for decoding with name, less than 4 bytes!",__FUNCTION__);
return -1
}
if bDecodeName != 0 {
nNameSize := C_AMF_DecodeInt16(data[:2])
if int(nNameSize) > len(data)-2 {
// TODO use new logger here
//RTMP_Log(RTMP_LOGDEBUG, "%s: Name size out of range: namesize (%d) > len (%d) - 2",__FUNCTION__, nNameSize, nSize);
return -1
}
prop.p_name = C_AMF_DecodeString(data)
data = data[2+nNameSize:]
}
if len(data) == 0 {
return -1
}
prop.p_type = C_AMFDataType(data[0])
data = data[1:]
var nRes int32
switch prop.p_type {
case AMF_NUMBER:
if len(data) < 8 {
return -1
}
prop.p_vu.p_number = C_AMF_DecodeNumber(data[:8])
data = data[8:]
case AMF_BOOLEAN:
panic("AMF_BOOLEAN not supported")
case AMF_STRING:
nStringSize := C_AMF_DecodeInt16(data[:2])
if len(data) < int(nStringSize+2) {
return -1
}
prop.p_vu.p_aval = C_AMF_DecodeString(data)
data = data[2+nStringSize:]
case AMF_OBJECT:
nRes := C_AMF_Decode(&prop.p_vu.p_object, bAddr(data), int32(len(data)), 1)
if nRes == -1 {
return -1
}
data = data[nRes:]
case AMF_MOVIECLIP:
// TODO use new logger here
log.Println("AMFProp_Decode: MAF_MOVIECLIP reserved!")
//RTMP_Log(RTMP_LOGERROR, "AMF_MOVIECLIP reserved!");
return -1
case AMF_NULL, AMF_UNDEFINED, AMF_UNSUPPORTED:
prop.p_type = AMF_NULL
case AMF_REFERENCE:
// TODO use new logger here
log.Println("AMFProp_Decode: AMF_REFERENCE not supported!")
//RTMP_Log(RTMP_LOGERROR, "AMF_REFERENCE not supported!");
return -1
case AMF_ECMA_ARRAY:
// next comes the rest, mixed array has a final 0x000009 mark and names, so its an object
data = data[4:]
nRes = C_AMF_Decode(&prop.p_vu.p_object, bAddr(data), int32(len(data)), 1)
if nRes == -1 {
return -1
}
data = data[nRes:]
case AMF_OBJECT_END:
return -1
case AMF_STRICT_ARRAY:
panic("AMF_STRICT_ARRAY not supported")
case AMF_DATE:
panic("AMF_DATE not supported")
case AMF_LONG_STRING, AMF_XML_DOC:
panic("AMF_LONG_STRING, AMF_XML_DOC not supported")
case AMF_RECORDSET:
// TODO use new logger here
log.Println("AMFProp_Decode: AMF_RECORDSET reserved!")
//RTMP_Log(RTMP_LOGERROR, "AMF_RECORDSET reserved!");
return -1
case AMF_TYPED_OBJECT:
// TODO use new logger here
// RTMP_Log(RTMP_LOGERROR, "AMF_TYPED_OBJECT not supported!")
return -1
case AMF_AVMPLUS:
panic("AMF_AVMPLUS not supported")
default:
// TODO use new logger here
//RTMP_Log(RTMP_LOGDEBUG, "%s - unknown datatype 0x%02x, @%p", __FUNCTION__,
//prop.p_type, pBuffer - 1);
return -1
}
return int32(nOriginalSize - len(data))
}
// void AMFProp_Reset(AMFObjectProperty* prop);
// amf.c +875
func C_AMFProp_Reset(prop *C_AMFObjectProperty) {
if prop.p_type == AMF_OBJECT || prop.p_type == AMF_ECMA_ARRAY ||
prop.p_type == AMF_STRICT_ARRAY {
C_AMF_Reset(&prop.p_vu.p_object)
} else {
prop.p_vu.p_aval = ""
}
prop.p_type = AMF_INVALID
}
// char* AMF_Encode(AMFObject* obj, char* pBuffer, char* pBufEnd);
// amf.c +891
func C_AMF_Encode(obj *C_AMFObject, dst []byte) []byte {
if len(dst) < 5 {
return nil
}
dst[0] = AMF_OBJECT
dst = dst[1:]
for i := 0; i < len(obj.o_props); i++ {
dst = C_AMF_PropEncode(&obj.o_props[i], dst)
if dst == nil {
log.Println("C_AMF_Encode: failed to encode property in index")
break
}
}
if len(dst) < 4 {
return nil
}
return C_AMF_EncodeInt24(dst, AMF_OBJECT_END)
}
// char* AMF_EncodeEcmaArray(AMFObject* obj, char* pBuffer, char* pBufEnd);
// amf.c +924
func C_AMF_EncodeEcmaArray(obj *C_AMFObject, dst []byte) []byte {
if len(dst) < 5 {
return nil
}
dst[0] = AMF_ECMA_ARRAY
dst = dst[1:]
binary.BigEndian.PutUint32(dst[:4], uint32(len(obj.o_props)))
dst = dst[4:]
for i := 0; i < len(obj.o_props); i++ {
dst = C_AMF_PropEncode(&obj.o_props[i], dst)
if dst == nil {
log.Println("C_AMF_EncodeEcmaArray: failed to encode property!")
break
}
}
if len(dst) < 4 {
return nil
}
return C_AMF_EncodeInt24(dst, AMF_OBJECT_END)
}
// char* AMF_EncodeArray(AMFObject* obj, char* pBuffer, char* pBufEnd);
// amf.c +959
func C_AMF_EncodeArray(obj *C_AMFObject, dst []byte) []byte {
if len(dst) < 5 {
return nil
}
dst[0] = AMF_STRICT_ARRAY
dst = dst[1:]
binary.BigEndian.PutUint32(dst[:4], uint32(len(obj.o_props)))
dst = dst[4:]
for i := 0; i < len(obj.o_props); i++ {
dst = C_AMF_PropEncode(&obj.o_props[i], dst)
if dst == nil {
log.Println("C_AMF_EncodeArray: failed to encode property!")
break
}
}
return dst
}
// int AMF_DecodeArray(AMFObject *obj, const char *pBuffer, int nSize, int nArrayLen, int bDecodeName);
// amf.c +993
func C_AMF_DecodeArray(obj *C_AMFObject, pBuffer *byte, nSize, nArrayLen, bDecodeName int32) int32 {
nOriginalSize := nSize
var bError int32 = 0
obj.o_props = obj.o_props[:0]
for nArrayLen > 0 {
var prop C_AMFObjectProperty
var nRes int32
nArrayLen--
if nSize <= 0 {
bError = 1
break
}
nRes = C_AMFProp_Decode(&prop, pl2b(pBuffer, int(nSize)), bDecodeName)
if nRes == -1 {
bError = 1
break
} else {
nSize -= nRes
pBuffer = (*byte)(incBytePtr(unsafe.Pointer(pBuffer), int(nRes)))
obj.o_props = append(obj.o_props, prop)
}
}
if bError != 0 {
return -1
}
return nOriginalSize - nSize
}
// int AMF_Decode(AMFObject *obj, const char* pBuffer, int nSize, int bDecodeName);
// amf.c +1180
func C_AMF_Decode(obj *C_AMFObject, pBuffer *byte, nSize, bDecodeName int32) int32 {
nOriginalSize := nSize
var bError int32
obj.o_props = obj.o_props[:0]
for nSize > 0 {
var prop C_AMFObjectProperty
var nRes int32
if nSize >= 3 && C_AMF_DecodeInt24((*[_Gi]byte)(unsafe.Pointer(pBuffer))[:3]) == AMF_OBJECT_END {
nSize -= 3
bError = 0
break
}
if bError != 0 {
// TODO use new logger here
log.Println("AMF_Decode: decoding error, ignoring bytes until next known pattern!")
nSize--
pBuffer = (*byte)(incBytePtr(unsafe.Pointer(pBuffer), 1))
continue
}
// TODO port AMFProp_Decode
nRes = C_AMFProp_Decode(&prop, pl2b(pBuffer, int(nSize)), bDecodeName)
// nRes = int32(C.AMFProp_Decode(&prop, (*byte)(unsafe.Pointer(pBuffer)),
// int32(nSize), int32(bDecodeName)))
if nRes == -1 {
bError = 1
break
} else {
nSize -= nRes
if nSize < 0 {
bError = 1
break
}
pBuffer = (*byte)(incBytePtr(unsafe.Pointer(pBuffer), int(nRes)))
obj.o_props = append(obj.o_props, prop)
}
}
if bError != 0 {
return -1
}
return nOriginalSize - nSize
}
// AMFObjectProperty* AMF_GetProp(AMFObject *obj, const AVal* name, int nIndex);
// amf.c + 1249
func C_AMF_GetProp(obj *C_AMFObject, name string, idx int32) *C_AMFObjectProperty {
if idx >= 0 {
if idx < int32(len(obj.o_props)) {
return &obj.o_props[idx]
}
} else {
for i, p := range obj.o_props {
if p.p_name == name {
return &obj.o_props[i]
}
}
}
return &AMFProp_Invalid
}
// void AMF_Reset(AMFObject* obj);
// amf.c +1282
func C_AMF_Reset(obj *C_AMFObject) {
for i := range obj.o_props {
C_AMFProp_Reset(&obj.o_props[i])
}
obj.o_props = obj.o_props[:0]
}
/*
// void AMF3CD_AddProp(AMF3ClassDef *cd, AVal *prop);
// amf.c +1298
func AMF3CD_AddProp(cd *C.AMF3ClassDef, prop *C_AVal) {
if cd.cd_num&0x0f == 0 {
cd.cd_props = (*C_AVal)(realloc(unsafe.Pointer(cd.cd_props), int(uintptr(cd.cd_num+16)*unsafe.Sizeof(C_AVal{}))))
}
*(*C_AVal)(incPtr(unsafe.Pointer(cd.cd_props), int(cd.cd_num), int(unsafe.Sizeof(C_AVal{})))) = *prop
cd.cd_num++
}
*/