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mistserver/lib/mp4.cpp
Erik Zandvliet e217f41f17 CMAF Push Output
2021-10-19 22:29:40 +02:00

731 lines
26 KiB
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#include "json.h"
#include "mp4.h"
#include "mp4_adobe.h"
#include "mp4_dash.h"
#include "mp4_encryption.h" // /*LTS*/
#include "mp4_generic.h"
#include "mp4_ms.h"
#include <arpa/inet.h> //for htonl and friends
#include <stdlib.h> //for malloc and free
#include <string.h> //for memcpy
#include "bitfields.h"
#include "defines.h"
/// Contains all MP4 format related code.
namespace MP4{
/// Creates a new box, optionally using the indicated pointer for storage.
/// If manage is set to true, the pointer will be realloc'ed when the box needs to be resized.
/// If the datapointer is NULL, manage is assumed to be true even if explicitly given as false.
/// If managed, the pointer will be free'd upon destruction.
Box::Box(char *datapointer, bool manage){
data = datapointer;
managed = manage;
payloadOffset = 8;
if (data == 0){
clear();
}else{
data_size = ntohl(((int *)data)[0]);
}
}
Box::Box(const Box &rs){
data = rs.data;
managed = false;
payloadOffset = rs.payloadOffset;
if (data == 0){
clear();
}else{
data_size = ntohl(((int *)data)[0]);
}
}
Box &Box::operator=(const Box &rs){
clear();
if (data){
free(data);
data = 0;
}
data = rs.data;
managed = false;
payloadOffset = rs.payloadOffset;
if (data == 0){
clear();
}else{
data_size = ntohl(((int *)data)[0]);
}
return *this;
}
/// If managed, this will free the data pointer.
Box::~Box(){
if (managed && data){
free(data);
data = 0;
}
}
void Box::copyFrom(const Box &rs){
clear();
if (data){
free(data);
data = 0;
}
data = (char *)malloc(rs.data_size);
memcpy(data, rs.data, rs.data_size);
data_size = rs.data_size;
managed = true;
payloadOffset = rs.payloadOffset;
}
/// Returns the values at byte positions 4 through 7.
std::string Box::getType() const{return std::string(data + 4, 4);}
/// Returns true if the given 4-byte boxtype is equal to the values at byte positions 4 through 7.
bool Box::isType(const char *boxType) const{return !memcmp(boxType, data + 4, 4);}
/// Reads the first 8 bytes and returns
std::string readBoxType(FILE *newData){
char retVal[8] ={0, 0, 0, 0, 'e', 'r', 'r', 'o'};
long long unsigned int pos = ftell(newData);
fread(retVal, 8, 1, newData);
fseek(newData, pos, SEEK_SET);
return std::string(retVal + 4, 4);
}
/// Checks box size, offset-aware
uint64_t calcBoxSize(const char *p){
uint64_t r = ntohl(((int *)p)[0]);
if (r == 1){return (((uint64_t)ntohl(((int *)p)[2])) << 32) | ntohl(((int *)p)[3]);}
return r;
}
bool skipBox(FILE *newData){
char readVal[16];
long long unsigned int pos = ftell(newData);
if (fread(readVal, 16, 1, newData)){
uint64_t size = calcBoxSize(readVal);
if (size == 0){
fseek(newData, 0, SEEK_END);
return true;
}
DONTEVEN_MSG("skipping size 0x%.8lX", size);
if (fseek(newData, pos + size, SEEK_SET) == 0){
return true;
}else{
return false;
}
}else{
return false;
}
}
bool Box::read(FILE *newData){
char readVal[16];
long long unsigned int pos = ftell(newData);
if (fread(readVal, 16, 1, newData)){
payloadOffset = 8;
uint64_t size = ntohl(((int *)readVal)[0]);
if (size == 1){
if (fread(readVal + 4, 12, 1, newData)){
size = 0 + ntohl(((int *)readVal)[2]);
size <<= 32;
size += ntohl(((int *)readVal)[3]);
payloadOffset = 16;
}else{
return false;
}
}
if (size == 0){// no else if, because the extended size MAY be 0...
fseek(newData, 0, SEEK_END);
size = ftell(newData) - pos;
}
fseek(newData, pos, SEEK_SET);
data = (char *)realloc(data, size);
data_size = size;
return (fread(data, size, 1, newData) == 1);
}else{
return false;
}
}
/// Reads out a whole box (if possible) from newData, copying to the internal data storage and
/// removing from the input string. \returns True on success, false otherwise.
bool Box::read(std::string &newData){
if (!managed){return false;}
if (newData.size() > 4){
payloadOffset = 8;
uint64_t size = ntohl(((int *)newData.c_str())[0]);
if (size == 1){
if (newData.size() > 16){
size = 0 + ntohl(((int *)newData.c_str())[2]);
size <<= 32;
size += ntohl(((int *)newData.c_str())[3]);
payloadOffset = 16;
}else{
return false;
}
}
if (size == 0){size = newData.size();}
if (newData.size() >= size){
data = (char *)realloc(data, size);
data_size = size;
memcpy(data, newData.data(), size);
newData.erase(0, size);
return true;
}
}
return false;
}
/// Returns the total boxed size of this box, including the header.
uint64_t Box::boxedSize() const{
if (payloadOffset == 16){
return ((uint64_t)ntohl(((int *)data)[2]) << 32) | ntohl(((int *)data)[3]);
}
return ntohl(((int *)data)[0]);
}
/// Retruns the size of the payload of thix box, excluding the header.
/// This value is defined as boxedSize() - 8.
uint64_t Box::payloadSize() const{return boxedSize() - payloadOffset;}
/// Returns a copy of the data pointer.
char *Box::asBox(){return data;}
char *Box::payload(){return data + payloadOffset;}
/// Makes this box managed if it wasn't already, resetting the internal storage to 8 bytes (the minimum).
/// If this box wasn't managed, the original data is left intact - otherwise it is free'd.
/// If it was somehow impossible to allocate 8 bytes (should never happen), this will cause segfaults later.
void Box::clear(){
if (data && managed){free(data);}
managed = true;
payloadOffset = 8;
data = (char *)malloc(8);
if (data){
data_size = 8;
((int *)data)[0] = htonl(data_size);
}else{
data_size = 0;
}
}
/// Attempts to typecast this Box to a more specific type and call the toPrettyString() function of that type.
/// If this failed, it will print out a message saying pretty-printing is not implemented for boxtype.
std::string Box::toPrettyString(uint32_t indent) const{
switch (ntohl(*((int *)(data + 4)))){// type is at this address
case 0x6D666864: return ((MFHD *)this)->toPrettyString(indent); break;
case 0x6D6F6F66: return ((MOOF *)this)->toPrettyString(indent); break;
case 0x61627374: return ((ABST *)this)->toPrettyString(indent); break;
case 0x61667274: return ((AFRT *)this)->toPrettyString(indent); break;
case 0x61667261: return ((AFRA *)this)->toPrettyString(indent); break;
case 0x61737274: return ((ASRT *)this)->toPrettyString(indent); break;
case 0x7472756E: return ((TRUN *)this)->toPrettyString(indent); break;
case 0x74726166: return ((TRAF *)this)->toPrettyString(indent); break;
case 0x74666864: return ((TFHD *)this)->toPrettyString(indent); break;
case 0x68766343: return ((HVCC *)this)->toPrettyString(indent); break;
case 0x61766343: return ((AVCC *)this)->toPrettyString(indent); break;
case 0x73647470: return ((SDTP *)this)->toPrettyString(indent); break;
case 0x66747970: return ((FTYP *)this)->toPrettyString(indent); break;
case 0x73747970: return ((STYP *)this)->toPrettyString(indent); break;
case 0x6D6F6F76: return ((MOOV *)this)->toPrettyString(indent); break;
case 0x6D766578: return ((MVEX *)this)->toPrettyString(indent); break;
case 0x74726578: return ((TREX *)this)->toPrettyString(indent); break;
case 0x6D667261: return ((MFRA *)this)->toPrettyString(indent); break;
case 0x7472616B: return ((TRAK *)this)->toPrettyString(indent); break;
case 0x6D646961: return ((MDIA *)this)->toPrettyString(indent); break;
case 0x6D696E66: return ((MINF *)this)->toPrettyString(indent); break;
case 0x64696E66: return ((DINF *)this)->toPrettyString(indent); break;
case 0x6D66726F: return ((MFRO *)this)->toPrettyString(indent); break;
case 0x68646C72: return ((HDLR *)this)->toPrettyString(indent); break;
case 0x766D6864: return ((VMHD *)this)->toPrettyString(indent); break;
case 0x736D6864: return ((SMHD *)this)->toPrettyString(indent); break;
case 0x686D6864: return ((HMHD *)this)->toPrettyString(indent); break;
case 0x6E6D6864: return ((NMHD *)this)->toPrettyString(indent); break;
case 0x6D656864: return ((MEHD *)this)->toPrettyString(indent); break;
case 0x7374626C: return ((STBL *)this)->toPrettyString(indent); break;
case 0x64726566: return ((DREF *)this)->toPrettyString(indent); break;
case 0x75726C20: return ((URL *)this)->toPrettyString(indent); break;
case 0x75726E20: return ((URN *)this)->toPrettyString(indent); break;
case 0x6D766864: return ((MVHD *)this)->toPrettyString(indent); break;
case 0x74667261: return ((TFRA *)this)->toPrettyString(indent); break;
case 0x746B6864: return ((TKHD *)this)->toPrettyString(indent); break;
case 0x6D646864: return ((MDHD *)this)->toPrettyString(indent); break;
case 0x73747473: return ((STTS *)this)->toPrettyString(indent); break;
case 0x63747473: return ((CTTS *)this)->toPrettyString(indent); break;
case 0x73747363: return ((STSC *)this)->toPrettyString(indent); break;
case 0x7374636F: return ((STCO *)this)->toPrettyString(indent); break;
case 0x636F3634: return ((CO64 *)this)->toPrettyString(indent); break;
case 0x7374737A: return ((STSZ *)this)->toPrettyString(indent); break;
case 0x73747364: return ((STSD *)this)->toPrettyString(indent); break;
case 0x6D703461: // mp4a
case 0x656E6361: // enca
case 0x61632D33: // ac-3
return ((MP4A *)this)->toPrettyString(indent);
break;
case 0x64616333: return ((DAC3 *)this)->toPrettyString(indent); break;
case 0x61616320: return ((AAC *)this)->toPrettyString(indent); break;
case 0x68766331:
case 0x68657631: return ((HEV1 *)this)->toPrettyString(indent); break;
case 0x61766331:
case 0x656E6376: // encv
return ((AVC1 *)this)->toPrettyString(indent);
break;
case 0x68323634: // h264
return ((H264 *)this)->toPrettyString(indent);
break;
case 0x6669656C: return ((FIEL *)this)->toPrettyString(indent); break;
case 0x74726566: return ((TREF *)this)->toPrettyString(indent); break;
case 0x676D6864: return ((GMHD *)this)->toPrettyString(indent); break;
case 0x65647473: return ((EDTS *)this)->toPrettyString(indent); break;
case 0x73747373: return ((STSS *)this)->toPrettyString(indent); break;
case 0x6D657461: return ((META *)this)->toPrettyString(indent); break;
case 0x656C7374: return ((ELST *)this)->toPrettyString(indent); break;
case 0x65736473: return ((ESDS *)this)->toPrettyString(indent); break;
case 0x75647461: return ((UDTA *)this)->toPrettyString(indent); break;
case 0x75756964: return ((UUID *)this)->toPrettyString(indent); break;
case 0x70617370: return ((PASP *)this)->toPrettyString(indent); break;
/*LTS-START*/
case 0x73696478: return ((SIDX *)this)->toPrettyString(indent); break;
case 0x74666474: return ((TFDT *)this)->toPrettyString(indent); break;
case 0x696F6473: return ((IODS *)this)->toPrettyString(indent); break;
case 0x73696E66: return ((SINF *)this)->toPrettyString(indent); break;
case 0x66726D61: return ((FRMA *)this)->toPrettyString(indent); break;
case 0x7363686D: return ((SCHM *)this)->toPrettyString(indent); break;
case 0x73636869: return ((SCHI *)this)->toPrettyString(indent); break;
case 0x74783367:
INFO_MSG("TX3G box found!");
return ((TX3G *)this)->toPrettyString(indent);
break;
case 0x66746162:
INFO_MSG("FTAB box found!");
return ((FontTableBox *)this)->toPrettyString(indent);
break;
case 0x70737368: return ((PSSH *)this)->toPrettyString(indent); break;
case 0x73656E63: return ((SENC *)this)->toPrettyString(indent); break;
case 0x74656E63: return ((TENC *)this)->toPrettyString(indent); break;
case 0x7361697A: return ((SAIZ *)this)->toPrettyString(indent); break;
case 0x7361696F: return ((SAIO *)this)->toPrettyString(indent); break;
case 0x62747274: return ((BTRT *)this)->toPrettyString(indent); break;
/*LTS-END*/
default: INFO_MSG("no code found: 0x%.8x", Bit::btohl(data + 4)); break;
}
std::stringstream retval;
retval << std::string(indent, ' ') << "Unimplemented pretty-printing for box "
<< std::string(data + 4, 4) << " (" << ntohl(((int *)data)[0]) << ")\n";
/// \todo Implement hexdump for unimplemented boxes?
return retval.str();
}
/// Sets the 8 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Fails silently if resizing failed.
void Box::setInt8(char newData, size_t index){
index += payloadOffset;
if (index >= boxedSize()){
if (!reserve(index, 0, 1)){return;}
}
data[index] = newData;
}
/// Gets the 8 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Returns zero if resizing failed.
char Box::getInt8(size_t index){
index += payloadOffset;
if (index >= boxedSize()){
if (!reserve(index, 0, 1)){return 0;}
setInt8(0, index - payloadOffset);
}
return data[index];
}
/// Gets the 8 bits integer at the given index.
/// Returns zero if out of bounds.
char Box::getInt8(size_t index) const{
index += payloadOffset;
if (index >= boxedSize()){return 0;}
return data[index];
}
/// Sets the 16 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Fails silently if resizing failed.
void Box::setInt16(short newData, size_t index){
index += payloadOffset;
if (index + 1 >= boxedSize()){
if (!reserve(index, 0, 2)){return;}
}
Bit::htobs(data + index, newData);
}
/// Gets the 16 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Returns zero if resizing failed.
short Box::getInt16(size_t index){
index += payloadOffset;
if (index + 1 >= boxedSize()){
if (!reserve(index, 0, 2)){return 0;}
setInt16(0, index - payloadOffset);
}
return Bit::btohs(data + index);
}
/// Gets the 16 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Returns zero if resizing failed.
short Box::getInt16(size_t index) const{
index += payloadOffset;
if (index + 1 >= boxedSize()){return 0;}
return Bit::btohs(data + index);
}
/// Sets the 24 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Fails silently if resizing failed.
void Box::setInt24(uint32_t newData, size_t index){
index += payloadOffset;
if (index + 2 >= boxedSize()){
if (!reserve(index, 0, 3)){return;}
}
Bit::htob24(data + index, newData);
}
/// Gets the 24 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Returns zero if resizing failed.
uint32_t Box::getInt24(size_t index){
index += payloadOffset;
if (index + 2 >= boxedSize()){
if (!reserve(index, 0, 3)){return 0;}
setInt24(0, index - payloadOffset);
}
return Bit::btoh24(data + index);
}
/// Gets the 24 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Returns zero if resizing failed.
uint32_t Box::getInt24(size_t index) const{
index += payloadOffset;
if (index + 2 >= boxedSize()){return 0;}
return Bit::btoh24(data + index);
}
/// Sets the 32 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Fails silently if resizing failed.
void Box::setInt32(uint32_t newData, size_t index){
index += payloadOffset;
if (index + 3 >= boxedSize()){
if (!reserve(index, 0, 4)){return;}
}
Bit::htobl(data + index, newData);
}
/// Gets the 32 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Returns zero if resizing failed.
uint32_t Box::getInt32(size_t index){
index += payloadOffset;
if (index + 3 >= boxedSize()){
if (!reserve(index, 0, 4)){return 0;}
setInt32(0, index - payloadOffset);
}
return Bit::btohl(data + index);
}
/// Gets the 32 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Returns zero if resizing failed.
uint32_t Box::getInt32(size_t index) const{
index += payloadOffset;
if (index + 3 >= boxedSize()){return 0;}
return Bit::btohl(data + index);
}
/// Sets the 64 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Fails silently if resizing failed.
void Box::setInt64(uint64_t newData, size_t index){
index += payloadOffset;
if (index + 7 >= boxedSize()){
if (!reserve(index, 0, 8)){return;}
}
Bit::htobll(data + index, newData);
}
/// Gets the 64 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Returns zero if resizing failed.
uint64_t Box::getInt64(size_t index){
index += payloadOffset;
if (index + 7 >= boxedSize()){
if (!reserve(index, 0, 8)){return 0;}
setInt64(0, index - payloadOffset);
}
return Bit::btohll(data + index);
}
/// Gets the 64 bits integer at the given index.
/// Attempts to resize the data pointer if the index is out of range.
/// Returns zero if resizing failed.
uint64_t Box::getInt64(size_t index) const{
index += payloadOffset;
if (index + 7 >= boxedSize()){return 0;}
return Bit::btohll(data + index);
}
/// Sets the NULL-terminated string at the given index.
/// Will attempt to resize if the string doesn't fit.
/// Fails silently if resizing failed.
void Box::setString(std::string newData, size_t index){
setString((char *)newData.c_str(), newData.size(), index);
}
/// Sets the NULL-terminated string at the given index.
/// Will attempt to resize if the string doesn't fit.
/// Fails silently if resizing failed.
void Box::setString(char *newData, size_t size, size_t index){
index += payloadOffset;
if (index >= boxedSize()){
if (!reserve(index, 0, 1)){return;}
data[index] = 0;
}
if (getStringLen(index) != size){
if (!reserve(index, getStringLen(index) + 1, size + 1)){return;}
}
memcpy(data + index, newData, size + 1);
}
/// Gets the NULL-terminated string at the given index.
/// Will attempt to resize if the string is out of range.
/// Returns null if resizing failed.
char *Box::getString(size_t index){
index += payloadOffset;
if (index >= boxedSize()){
if (!reserve(index, 0, 1)){return 0;}
data[index] = 0;
}
return data + index;
}
/// Returns the length of the NULL-terminated string at the given index.
/// Returns 0 if out of range.
size_t Box::getStringLen(size_t index) const{
index += payloadOffset;
if (index >= boxedSize()){return 0;}
return strlen(data + index);
}
/// Gets a reference to the box at the given index.
/// Do not store or copy this reference, for there will be raptors.
/// Will attempt to resize if out of range.
/// Returns an 8-byte error box if resizing failed.
Box &Box::getBox(size_t index){
static Box retbox = Box((char *)"\000\000\000\010erro", false);
index += payloadOffset;
if (index + 8 > boxedSize()){
if (!reserve(index, 0, 8)){
retbox = Box((char *)"\000\000\000\010erro", false);
return retbox;
}
memcpy(data + index, "\000\000\000\010erro", 8);
}
retbox = Box(data + index, false);
return retbox;
}
/// Returns the size of the box at the given position.
/// Returns undefined values if there is no box at the given position.
/// Returns 0 if out of range.
size_t Box::getBoxLen(size_t index) const{
if ((index + payloadOffset + 8) >= boxedSize()){return 0;}
return calcBoxSize(data + index + payloadOffset);
}
/// Replaces the existing box at the given index by the new box newEntry.
/// Will resize if needed, will reserve new space if out of range.
void Box::setBox(Box &newEntry, size_t index){
int oldlen = getBoxLen(index);
int newlen = newEntry.boxedSize();
if (oldlen != newlen && !reserve(index + payloadOffset, oldlen, newlen)){return;}
memcpy(data + index + payloadOffset, newEntry.asBox(), newlen);
}
/// Attempts to reserve enough space for wanted bytes of data at given position, where current
/// bytes of data is now reserved. This will move any existing data behind the currently reserved
/// space to the proper location after reserving. \returns True on success, false otherwise.
bool Box::reserve(size_t position, size_t current, size_t wanted){
if (current == wanted){return true;}
if (position > boxedSize()){wanted += position - boxedSize();}
if (current < wanted){
// make bigger
if (boxedSize() + (wanted - current) > data_size){
// realloc if managed, otherwise fail
if (!managed){return false;}
void *ret = realloc(data, boxedSize() + (wanted - current));
if (!ret){return false;}
data = (char *)ret;
memset(data + boxedSize(), 0, wanted - current); // initialize to 0
data_size = boxedSize() + (wanted - current);
}
}
// move data behind, if any
if (boxedSize() > (position + current)){
memmove(data + position + wanted, data + position + current, boxedSize() - (position + current));
}
// calculate and set new size
if (payloadOffset != 16){
int newSize = boxedSize() + (wanted - current);
((int *)data)[0] = htonl(newSize);
}
return true;
}
fullBox::fullBox(){setVersion(0);}
void fullBox::setVersion(char newVersion){setInt8(newVersion, 0);}
char fullBox::getVersion() const{return getInt8(0);}
void fullBox::setFlags(uint32_t newFlags){setInt24(newFlags, 1);}
uint32_t fullBox::getFlags() const{return getInt24(1);}
std::string fullBox::toPrettyString(uint32_t indent) const{
std::stringstream r;
r << std::string(indent + 1, ' ') << "Version: " << (int)getVersion() << std::endl;
r << std::string(indent + 1, ' ') << "Flags: " << getFlags() << std::endl;
return r.str();
}
containerBox::containerBox(){}
uint32_t containerBox::getContentCount(){
int res = 0;
unsigned int tempLoc = 0;
while (tempLoc < boxedSize() - 8){
res++;
tempLoc += Box(getBox(tempLoc).asBox(), false).boxedSize();
}
return res;
}
void containerBox::setContent(Box &newContent, uint32_t no){
int tempLoc = 0;
unsigned int contentCount = getContentCount();
for (unsigned int i = 0; i < no; i++){
if (i < contentCount){
tempLoc += getBoxLen(tempLoc);
}else{
if (!reserve(tempLoc, 0, (no - contentCount) * 8)){return;};
memset(data + tempLoc, 0, (no - contentCount) * 8);
tempLoc += (no - contentCount) * 8;
break;
}
}
setBox(newContent, tempLoc);
}
Box &containerBox::getContent(uint32_t no, bool unsafe){
static Box ret = Box((char *)"\000\000\000\010erro", false);
if (!unsafe && no > getContentCount()){return ret;}
unsigned int i = 0;
int tempLoc = 0;
while (i < no){
tempLoc += getBoxLen(tempLoc);
i++;
}
return getBox(tempLoc);
}
Box containerBox::getChild(const char *boxName){
uint32_t count = getContentCount();
for (uint32_t i = 0; i < count; i++){
Box &thisChild = getContent(i);
if (thisChild.isType(boxName)){return Box(thisChild.asBox(), false);}
}
return Box((char *)"\000\000\000\010erro", false);
}
std::deque<Box> containerBox::getChildren(const char *boxName){
std::deque<Box> res;
uint32_t count = getContentCount();
for (uint32_t i = 0; i < count; i++){
Box &thisChild = getContent(i);
if (thisChild.isType(boxName)){res.push_back(Box(thisChild.asBox(), false));}
}
return res;
}
std::string containerBox::toPrettyString(uint32_t indent){
std::stringstream r;
r << std::string(indent, ' ') << "[" << getType() << "] Container Box (" << boxedSize() << ")" << std::endl;
Box curBox;
int tempLoc = 0;
int contentCount = getContentCount();
for (int i = 0; i < contentCount; i++){
curBox = getContent(i);
r << curBox.toPrettyString(indent + 1);
tempLoc += getBoxLen(tempLoc);
}
return r.str();
}
uint32_t containerFullBox::getContentCount(){
int res = 0;
unsigned int tempLoc = 4;
while (tempLoc < boxedSize() - 8){
res++;
tempLoc += getBoxLen(tempLoc);
}
return res;
}
void containerFullBox::setContent(Box &newContent, uint32_t no){
int tempLoc = 4;
unsigned int contentCount = getContentCount();
for (unsigned int i = 0; i < no; i++){
if (i < contentCount){
tempLoc += getBoxLen(tempLoc);
}else{
if (!reserve(tempLoc, 0, (no - contentCount) * 8)){return;};
memset(data + tempLoc, 0, (no - contentCount) * 8);
tempLoc += (no - contentCount) * 8;
break;
}
}
setBox(newContent, tempLoc);
}
Box &containerFullBox::getContent(uint32_t no){
static Box ret = Box((char *)"\000\000\000\010erro", false);
if (no > getContentCount()){return ret;}
unsigned int i = 0;
int tempLoc = 4;
while (i < no){
tempLoc += getBoxLen(tempLoc);
i++;
}
return getBox(tempLoc);
}
std::string containerFullBox::toPrettyCFBString(uint32_t indent, std::string boxName){
std::stringstream r;
r << std::string(indent, ' ') << boxName << " (" << boxedSize() << ")" << std::endl;
r << fullBox::toPrettyString(indent);
Box curBox;
int tempLoc = 4;
int contentCount = getContentCount();
for (int i = 0; i < contentCount; i++){
curBox = getContent(i);
r << curBox.toPrettyString(indent + 1);
tempLoc += getBoxLen(tempLoc);
}
return r.str();
}
}// namespace MP4
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