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mistserver/lib/flv_tag.cpp
DDVTech fccf66fba2 Restyle
2021-10-19 22:29:40 +02:00

937 lines
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/// \file flv_tag.cpp
/// Holds all code for the FLV namespace.
#include "adts.h"
#include "defines.h"
#include "flv_tag.h"
#include "rtmpchunks.h"
#include "timing.h"
#include "util.h"
#include <fcntl.h> //for Tag::FileLoader
#include <sstream>
#include <stdio.h> //for Tag::FileLoader
#include <stdlib.h> //malloc
#include <string.h> //memcpy
#include <unistd.h> //for Tag::FileLoader
#include "h264.h" //Needed for init data parsing in case of invalid values from FLV init
/// Holds the last FLV header parsed.
/// Defaults to a audio+video header on FLV version 0x01 if no header received yet.
char FLV::Header[13] ={'F', 'L', 'V', 0x01, 0x05, 0, 0, 0, 0x09, 0, 0, 0, 0};
bool FLV::Parse_Error = false; ///< This variable is set to true if a problem is encountered while parsing the FLV.
std::string FLV::Error_Str = "";
/// Checks a FLV Header for validness. Returns true if the header is valid, false
/// if the header is not. Not valid can mean:
/// - Not starting with the string "FLV".
/// - The DataOffset is not 9 bytes.
/// - The PreviousTagSize is not 0 bytes.
///
/// Note that we see PreviousTagSize as part of the FLV header, not part of the tag header!
bool FLV::check_header(char *header){
if (header[0] != 'F') return false;
if (header[1] != 'L') return false;
if (header[2] != 'V') return false;
if (header[5] != 0) return false;
if (header[6] != 0) return false;
if (header[7] != 0) return false;
if (header[8] != 0x09) return false;
if (header[9] != 0) return false;
if (header[10] != 0) return false;
if (header[11] != 0) return false;
if (header[12] != 0) return false;
return true;
}// FLV::check_header
/// Checks the first 3 bytes for the string "FLV". Implementing a basic FLV header check,
/// returning true if it is, false if not.
bool FLV::is_header(char *header){
if (header[0] != 'F') return false;
if (header[1] != 'L') return false;
if (header[2] != 'V') return false;
return true;
}// FLV::is_header
/// Helper function that can quickly skip through a file looking for a particular tag type
bool FLV::seekToTagType(FILE *f, uint8_t t){
long long startPos = Util::ftell(f);
DONTEVEN_MSG("Starting seek at %lld", startPos);
char buf[4];
if (fread(buf, 4, 1, f) != 1){return false;}
while (!feof(f) && !ferror(f)){
switch (buf[0]){
case 0x09:
case 0x08:
case 0x12:{
if (t == buf[0]){
if (fseek(f, -4, SEEK_CUR)){WARN_MSG("Could not seek back in FLV stream!");}
INSANE_MSG("Found tag of type %u at %" PRIu64, t, Util::ftell(f));
return true;
}
long len = (buf[1] << 16) | (buf[2] << 8) | buf[3];
if (fseek(f, len + 11, SEEK_CUR)){
WARN_MSG("Could not seek forward in FLV stream!");
}else{
DONTEVEN_MSG("Seeking %ld+4 bytes forward, now at %" PRIu64, len + 11, Util::ftell(f));
}
if (fread(buf, 4, 1, f) != 1){return false;}
}break;
default:
WARN_MSG("Invalid FLV tag detected! Aborting search.");
if (fseek(f, -4, SEEK_CUR)){WARN_MSG("Could not seek back in FLV stream!");}
return false;
}
}
return false;
}
/// True if this media type requires init data.
/// Will always return false if the tag type is not 0x08 or 0x09.
/// Returns true for H263, AVC (H264), AAC.
/// \todo Check if MP3 does or does not require init data...
bool FLV::Tag::needsInitData(){
switch (data[0]){
case 0x09:
switch (data[11] & 0x0F){
case 2: return true; break; // H263 requires init data
case 7: return true; break; // AVC requires init data
default: return false; break; // other formats do not
}
break;
case 0x08:
switch (data[11] & 0xF0){
case 0x20: return false; break; // MP3 does not...? Unsure.
case 0xA0: return true; break; // AAC requires init data
case 0xE0: return false; break; // MP38kHz does not...?
default: return false; break; // other formats do not
}
break;
}
return false; // only audio/video can require init data
}
/// True if current tag is init data for this media type.
bool FLV::Tag::isInitData(){
switch (data[0]){
case 0x09:
switch (data[11] & 0xF0){
case 0x50: return true; break;
}
if ((data[11] & 0x0F) == 7){
switch (data[12]){
case 0: return true; break;
}
}
break;
case 0x08:
if ((data[12] == 0) && ((data[11] & 0xF0) == 0xA0)){return true;}
break;
}
return false;
}
const char *FLV::Tag::getVideoCodec(){
switch (data[11] & 0x0F){
case 1: return "JPEG";
case 2: return "H263";
case 3: return "ScreenVideo1";
case 4: return "VP6";
case 5: return "VP6Alpha";
case 6: return "ScreenVideo2";
case 7: return "H264";
default: return "unknown";
}
}
const char *FLV::Tag::getAudioCodec(){
switch (data[11] & 0xF0){
case 0x00:
if (data[11] & 0x02){
return "PCMPE"; // unknown endianness
}else{
return "PCM"; // 8 bit is always regular PCM
}
case 0x10: return "ADPCM";
case 0x20: return "MP3";
case 0x30: return "PCM";
case 0x40:
case 0x50:
case 0x60: return "Nellymoser";
case 0x70: return "ALAW";
case 0x80: return "ULAW";
case 0x90: return "reserved";
case 0xA0: return "AAC";
case 0xB0: return "Speex";
case 0xE0: return "MP3";
case 0xF0: return "DeviceSpecific";
default: return "unknown";
}
}
/// Returns a std::string describing the tag in detail.
/// The string includes information about whether the tag is
/// audio, video or metadata, what encoding is used, and the details
/// of the encoding itself.
std::string FLV::Tag::tagType(){
std::stringstream R;
R << len << " bytes of ";
switch (data[0]){
case 0x09:
R << getVideoCodec() << " video ";
switch (data[11] & 0xF0){
case 0x10: R << "keyframe"; break;
case 0x20: R << "iframe"; break;
case 0x30: R << "disposableiframe"; break;
case 0x40: R << "generatedkeyframe"; break;
case 0x50: R << "videoinfo"; break;
}
if ((data[11] & 0x0F) == 7){
switch (data[12]){
case 0: R << " header"; break;
case 1: R << " NALU"; break;
case 2: R << " endofsequence"; break;
}
}
break;
case 0x08:
R << getAudioCodec();
switch (data[11] & 0x0C){
case 0x0: R << " 5.5kHz"; break;
case 0x4: R << " 11kHz"; break;
case 0x8: R << " 22kHz"; break;
case 0xC: R << " 44kHz"; break;
}
switch (data[11] & 0x02){
case 0: R << " 8bit"; break;
case 2: R << " 16bit"; break;
}
switch (data[11] & 0x01){
case 0: R << " mono"; break;
case 1: R << " stereo"; break;
}
R << " audio";
if ((data[12] == 0) && ((data[11] & 0xF0) == 0xA0)){R << " initdata";}
break;
case 0x12:{
R << "(meta)data: ";
AMF::Object metadata = AMF::parse((unsigned char *)data + 11, len - 15);
R << metadata.Print();
break;
}
default: R << "unknown"; break;
}
return R.str();
}// FLV::Tag::tagtype
/// Returns the 24-bit offset of this tag.
/// Returns 0 if the tag isn't H264
int64_t FLV::Tag::offset(){
if ((data[11] & 0x0F) != 7){return 0;}
return (((data[13] << 16) + (data[14] << 8) + data[15]) << 8) >> 8;
}// offset getter
/// Sets the 24-bit offset of this tag.
/// Ignored if the tag isn't H264
void FLV::Tag::offset(int64_t o){
data[13] = (o >> 16) & 0xFF;
data[14] = (o >> 8) & 0XFF;
data[15] = o & 0xFF;
}// offset setter
/// Returns the 32-bit timestamp of this tag.
uint64_t FLV::Tag::tagTime(){
return ((uint64_t)data[4] << 16) + ((uint64_t)data[5] << 8) + data[6] + ((uint64_t)data[7] << 24);
}// tagTime getter
/// Sets the 32-bit timestamp of this tag.
void FLV::Tag::tagTime(uint64_t T){
data[4] = ((T >> 16) & 0xFF);
data[5] = ((T >> 8) & 0xFF);
data[6] = (T & 0xFF);
data[7] = ((T >> 24) & 0xFF);
}// tagTime setter
/// Constructor for a new, empty, tag.
/// The buffer length is initialized to 0, and later automatically
/// increased if neccesary.
FLV::Tag::Tag(){
len = 0;
buf = 0;
data = 0;
isKeyframe = false;
done = true;
sofar = 0;
}// empty constructor
/// Copy constructor, copies the contents of an existing tag.
/// The buffer length is initialized to the actual size of the tag
/// that is being copied, and later automaticallt increased if
/// neccesary.
FLV::Tag::Tag(const Tag &O){
done = true;
sofar = 0;
len = O.len;
data = 0;
if (len > 0){
if (checkBufferSize()){memcpy(data, O.data, len);}
}
isKeyframe = O.isKeyframe;
}// copy constructor
/// Copy constructor from a RTMP chunk.
/// Copies the contents of a RTMP chunk into a valid FLV tag.
/// Exactly the same as making a chunk by through the default (empty) constructor
/// and then calling FLV::Tag::ChunkLoader with the chunk as argument.
FLV::Tag::Tag(const RTMPStream::Chunk &O){
len = 0;
buf = 0;
data = 0;
isKeyframe = false;
done = true;
sofar = 0;
ChunkLoader(O);
}
/// Generic destructor that frees the allocated memory in the internal data variable, if any.
FLV::Tag::~Tag(){
if (data){
free(data);
data = 0;
buf = 0;
len = 0;
}
}
/// Assignment operator - works exactly like the copy constructor.
/// This operator checks for self-assignment.
FLV::Tag &FLV::Tag::operator=(const FLV::Tag &O){
if (this != &O){// no self-assignment
done = true;
sofar = 0;
len = O.len;
if (len > 0){
if (checkBufferSize()){
memcpy(data, O.data, len);
}else{
len = buf;
}
}
isKeyframe = O.isKeyframe;
}
return *this;
}// assignment operator
bool FLV::Tag::DTSCLoader(DTSC::Packet &packData, DTSC::Track &track){
std::string meta_str;
len = 0;
if (track.type == "video"){
char *tmpData = 0;
size_t tmpLen = 0;
packData.getString("data", tmpData, tmpLen);
len = tmpLen + 16;
if (track.codec == "H264"){len += 4;}
if (!checkBufferSize()){return false;}
if (track.codec == "H264"){
memcpy(data + 16, tmpData, len - 20);
data[12] = 1;
offset(packData.getInt("offset"));
}else{
memcpy(data + 12, tmpData, len - 16);
}
data[11] = 0;
if (track.codec == "H264"){data[11] |= 7;}
if (track.codec == "ScreenVideo2"){data[11] |= 6;}
if (track.codec == "VP6Alpha"){data[11] |= 5;}
if (track.codec == "VP6"){data[11] |= 4;}
if (track.codec == "ScreenVideo1"){data[11] |= 3;}
if (track.codec == "H263"){data[11] |= 2;}
if (track.codec == "JPEG"){data[11] |= 1;}
if (packData.getFlag("keyframe")){
data[11] |= 0x10;
}else{
data[11] |= 0x20;
}
if (packData.getFlag("disposableframe")){data[11] |= 0x30;}
}
if (track.type == "audio"){
char *tmpData = 0;
size_t tmpLen = 0;
packData.getString("data", tmpData, tmpLen);
len = tmpLen + 16;
if (track.codec == "AAC"){len++;}
if (!checkBufferSize()){return false;}
if (track.codec == "AAC"){
memcpy(data + 13, tmpData, len - 17);
data[12] = 1; // raw AAC data, not sequence header
}else{
memcpy(data + 12, tmpData, len - 16);
}
unsigned int datarate = track.rate;
data[11] = 0;
if (track.codec == "AAC"){data[11] |= 0xA0;}
if (track.codec == "MP3"){
if (datarate == 8000){
data[11] |= 0xE0;
}else{
data[11] |= 0x20;
}
}
if (track.codec == "ADPCM"){data[11] |= 0x10;}
if (track.codec == "PCM"){data[11] |= 0x30;}
if (track.codec == "Nellymoser"){
if (datarate == 8000){
data[11] |= 0x50;
}else if (datarate == 16000){
data[11] |= 0x40;
}else{
data[11] |= 0x60;
}
}
if (track.codec == "ALAW"){data[11] |= 0x70;}
if (track.codec == "ULAW"){data[11] |= 0x80;}
if (track.codec == "Speex"){data[11] |= 0xB0;}
if (datarate >= 44100){
data[11] |= 0x0C;
}else if (datarate >= 22050){
data[11] |= 0x08;
}else if (datarate >= 11025){
data[11] |= 0x04;
}
if (track.size != 8){data[11] |= 0x02;}
if (track.channels > 1){data[11] |= 0x01;}
}
if (!len){return false;}
setLen();
if (track.type == "video"){data[0] = 0x09;}
if (track.type == "audio"){data[0] = 0x08;}
if (track.type == "meta"){data[0] = 0x12;}
data[1] = ((len - 15) >> 16) & 0xFF;
data[2] = ((len - 15) >> 8) & 0xFF;
data[3] = (len - 15) & 0xFF;
data[8] = 0;
data[9] = 0;
data[10] = 0;
tagTime(packData.getTime());
return true;
}
/// Helper function that properly sets the tag length from the internal len variable.
void FLV::Tag::setLen(){
int len4 = len - 4;
int i = len;
data[--i] = (len4)&0xFF;
len4 >>= 8;
data[--i] = (len4)&0xFF;
len4 >>= 8;
data[--i] = (len4)&0xFF;
len4 >>= 8;
data[--i] = (len4)&0xFF;
}
/// FLV Video init data loader function from metadata.
bool FLV::Tag::DTSCVideoInit(DTSC::Track &video){
// Unknown? Assume H264.
len = 0;
if (video.codec == "?"){video.codec = "H264";}
if (video.codec == "H264"){len = video.init.size() + 20;}
if (len <= 0 || !checkBufferSize()){return false;}
memcpy(data + 16, video.init.c_str(), len - 20);
data[12] = 0; // H264 sequence header
data[13] = 0;
data[14] = 0;
data[15] = 0;
data[11] = 0x17; // H264 keyframe (0x07 & 0x10)
setLen();
data[0] = 0x09;
data[1] = ((len - 15) >> 16) & 0xFF;
data[2] = ((len - 15) >> 8) & 0xFF;
data[3] = (len - 15) & 0xFF;
data[8] = 0;
data[9] = 0;
data[10] = 0;
tagTime(0);
return true;
}
/// FLV Audio init data loader function from metadata.
bool FLV::Tag::DTSCAudioInit(DTSC::Track &audio){
len = 0;
// Unknown? Assume AAC.
if (audio.codec == "?"){audio.codec = "AAC";}
if (audio.codec == "AAC"){len = audio.init.size() + 17;}
if (len <= 0 || !checkBufferSize()){return false;}
memcpy(data + 13, audio.init.c_str(), len - 17);
data[12] = 0; // AAC sequence header
data[11] = 0;
if (audio.codec == "AAC"){data[11] += 0xA0;}
if (audio.codec == "MP3"){data[11] += 0x20;}
unsigned int datarate = audio.rate;
if (datarate >= 44100){
data[11] += 0x0C;
}else if (datarate >= 22050){
data[11] += 0x08;
}else if (datarate >= 11025){
data[11] += 0x04;
}
if (audio.size != 8){data[11] += 0x02;}
if (audio.channels > 1){data[11] += 0x01;}
setLen();
data[0] = 0x08;
data[1] = ((len - 15) >> 16) & 0xFF;
data[2] = ((len - 15) >> 8) & 0xFF;
data[3] = (len - 15) & 0xFF;
data[8] = 0;
data[9] = 0;
data[10] = 0;
tagTime(0);
return true;
}
bool FLV::Tag::DTSCMetaInit(DTSC::Meta &M, std::set<long unsigned int> &selTracks){
AMF::Object amfdata("root", AMF::AMF0_DDV_CONTAINER);
amfdata.addContent(AMF::Object("", "onMetaData"));
amfdata.addContent(AMF::Object("", AMF::AMF0_ECMA_ARRAY));
AMF::Object trinfo = AMF::Object("trackinfo", AMF::AMF0_STRICT_ARRAY);
int i = 0;
unsigned long long mediaLen = 0;
for (std::set<long unsigned int>::iterator it = selTracks.begin(); it != selTracks.end(); it++){
if (M.tracks[*it].lastms - M.tracks[*it].firstms > mediaLen){
mediaLen = M.tracks[*it].lastms - M.tracks[*it].firstms;
}
if (M.tracks[*it].type == "video"){
trinfo.addContent(AMF::Object("", AMF::AMF0_OBJECT));
trinfo.getContentP(i)->addContent(AMF::Object(
"length", ((double)M.tracks[*it].lastms / 1000) * ((double)M.tracks[*it].fpks / 1000.0), AMF::AMF0_NUMBER));
trinfo.getContentP(i)->addContent(
AMF::Object("timescale", ((double)M.tracks[*it].fpks / 1000.0), AMF::AMF0_NUMBER));
trinfo.getContentP(i)->addContent(AMF::Object("sampledescription", AMF::AMF0_STRICT_ARRAY));
amfdata.getContentP(1)->addContent(AMF::Object("hasVideo", 1, AMF::AMF0_BOOL));
if (M.tracks[*it].codec == "H264"){
amfdata.getContentP(1)->addContent(AMF::Object("videocodecid", 7, AMF::AMF0_NUMBER));
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string) "avc1"));
}
if (M.tracks[*it].codec == "ScreenVideo2"){
amfdata.getContentP(1)->addContent(AMF::Object("videocodecid", 6, AMF::AMF0_NUMBER));
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string) "sv2"));
}
if (M.tracks[*it].codec == "VP6Alpha"){
amfdata.getContentP(1)->addContent(AMF::Object("videocodecid", 5, AMF::AMF0_NUMBER));
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string) "vp6a"));
}
if (M.tracks[*it].codec == "VP6"){
amfdata.getContentP(1)->addContent(AMF::Object("videocodecid", 4, AMF::AMF0_NUMBER));
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string) "vp6"));
}
if (M.tracks[*it].codec == "ScreenVideo1"){
amfdata.getContentP(1)->addContent(AMF::Object("videocodecid", 3, AMF::AMF0_NUMBER));
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string) "sv1"));
}
if (M.tracks[*it].codec == "H263"){
amfdata.getContentP(1)->addContent(AMF::Object("videocodecid", 2, AMF::AMF0_NUMBER));
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string) "h263"));
}
if (M.tracks[*it].codec == "JPEG"){
amfdata.getContentP(1)->addContent(AMF::Object("videocodecid", 1, AMF::AMF0_NUMBER));
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string) "jpeg"));
}
amfdata.getContentP(1)->addContent(AMF::Object("width", M.tracks[*it].width, AMF::AMF0_NUMBER));
amfdata.getContentP(1)->addContent(AMF::Object("height", M.tracks[*it].height, AMF::AMF0_NUMBER));
amfdata.getContentP(1)->addContent(
AMF::Object("videoframerate", (double)M.tracks[*it].fpks / 1000.0, AMF::AMF0_NUMBER));
amfdata.getContentP(1)->addContent(
AMF::Object("videodatarate", (double)M.tracks[*it].bps / 128.0, AMF::AMF0_NUMBER));
++i;
}
if (M.tracks[*it].type == "audio"){
trinfo.addContent(AMF::Object("", AMF::AMF0_OBJECT));
trinfo.getContentP(i)->addContent(AMF::Object(
"length", ((double)M.tracks[*it].lastms) * ((double)M.tracks[*it].rate), AMF::AMF0_NUMBER));
trinfo.getContentP(i)->addContent(AMF::Object("timescale", M.tracks[*it].rate, AMF::AMF0_NUMBER));
trinfo.getContentP(i)->addContent(AMF::Object("sampledescription", AMF::AMF0_STRICT_ARRAY));
amfdata.getContentP(1)->addContent(AMF::Object("hasAudio", 1, AMF::AMF0_BOOL));
amfdata.getContentP(1)->addContent(AMF::Object("audiodelay", 0.0, AMF::AMF0_NUMBER));
if (M.tracks[*it].codec == "AAC"){
amfdata.getContentP(1)->addContent(AMF::Object("audiocodecid", (std::string) "mp4a"));
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string) "mp4a"));
}
if (M.tracks[*it].codec == "MP3"){
amfdata.getContentP(1)->addContent(AMF::Object("audiocodecid", (std::string) "mp3"));
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string) "mp3"));
}
amfdata.getContentP(1)->addContent(AMF::Object("audiochannels", M.tracks[*it].channels, AMF::AMF0_NUMBER));
amfdata.getContentP(1)->addContent(AMF::Object("audiosamplerate", M.tracks[*it].rate, AMF::AMF0_NUMBER));
amfdata.getContentP(1)->addContent(AMF::Object("audiosamplesize", M.tracks[*it].size, AMF::AMF0_NUMBER));
amfdata.getContentP(1)->addContent(
AMF::Object("audiodatarate", (double)M.tracks[*it].bps / 128.0, AMF::AMF0_NUMBER));
++i;
}
}
if (M.vod){
amfdata.getContentP(1)->addContent(AMF::Object("duration", mediaLen / 1000, AMF::AMF0_NUMBER));
}
amfdata.getContentP(1)->addContent(trinfo);
std::string tmp = amfdata.Pack();
len = tmp.length() + 15;
if (len <= 0 || !checkBufferSize()){return false;}
memcpy(data + 11, tmp.data(), len - 15);
setLen();
data[0] = 0x12;
data[1] = ((len - 15) >> 16) & 0xFF;
data[2] = ((len - 15) >> 8) & 0xFF;
data[3] = (len - 15) & 0xFF;
data[8] = 0;
data[9] = 0;
data[10] = 0;
tagTime(0);
return true;
}
/// FLV loader function from chunk.
/// Copies the contents and wraps it in a FLV header.
bool FLV::Tag::ChunkLoader(const RTMPStream::Chunk &O){
len = O.len + 15;
if (len > 0){
if (!checkBufferSize()){return false;}
memcpy(data + 11, &(O.data[0]), O.len);
}
setLen();
data[0] = O.msg_type_id;
data[3] = O.len & 0xFF;
data[2] = (O.len >> 8) & 0xFF;
data[1] = (O.len >> 16) & 0xFF;
tagTime(O.timestamp);
isKeyframe = ((data[0] == 0x09) && (((data[11] & 0xf0) >> 4) == 1));
return true;
}
/// Helper function for FLV::MemLoader.
/// This function will try to read count bytes from data buffer D into buffer.
/// This function should be called repeatedly until true.
/// P and sofar are not the same value, because D may not start with the current tag.
/// \param buffer The target buffer.
/// \param count Amount of bytes to read.
/// \param sofar Current amount read.
/// \param D The location of the data buffer.
/// \param S The size of the data buffer.
/// \param P The current position in the data buffer. Will be updated to reflect new position.
/// \return True if count bytes are read succesfully, false otherwise.
bool FLV::Tag::MemReadUntil(char *buffer, unsigned int count, unsigned int &sofar, char *D,
unsigned int S, unsigned int &P){
if (sofar >= count){return true;}
int r = 0;
if (P + (count - sofar) > S){
r = S - P;
}else{
r = count - sofar;
}
memcpy(buffer + sofar, D + P, r);
P += r;
sofar += r;
if (sofar >= count){return true;}
return false;
}// Tag::MemReadUntil
/// Try to load a tag from a data buffer in memory.
/// This is a stateful function - if fed incorrect data, it will most likely never return true
/// again! While this function returns false, the Tag might not contain valid data. \param D The
/// location of the data buffer. \param S The size of the data buffer. \param P The current position
/// in the data buffer. Will be updated to reflect new position. \return True if a whole tag is
/// succesfully read, false otherwise.
bool FLV::Tag::MemLoader(char *D, unsigned int S, unsigned int &P){
if (len < 15){len = 15;}
if (!checkBufferSize()){return false;}
if (done){
// read a header
if (MemReadUntil(data, 11, sofar, D, S, P)){
// if its a correct FLV header, throw away and read tag header
if (FLV::is_header(data)){
if (MemReadUntil(data, 13, sofar, D, S, P)){
if (FLV::check_header(data)){
sofar = 0;
memcpy(FLV::Header, data, 13);
}else{
FLV::Parse_Error = true;
Error_Str = "Invalid header received.";
return false;
}
}
}else{
// if a tag header, calculate length and read tag body
len = data[3] + 15;
len += (data[2] << 8);
len += (data[1] << 16);
if (!checkBufferSize()){return false;}
if (data[0] > 0x12){
data[0] += 32;
FLV::Parse_Error = true;
Error_Str = "Invalid Tag received (";
Error_Str += data[0];
Error_Str += ").";
return false;
}
done = false;
}
}
}else{
// read tag body
if (MemReadUntil(data, len, sofar, D, S, P)){
// calculate keyframeness, next time read header again, return true
isKeyframe = ((data[0] == 0x09) && (((data[11] & 0xf0) >> 4) == 1));
done = true;
sofar = 0;
return true;
}
}
return false;
}// Tag::MemLoader
/// Helper function for FLV::FileLoader.
/// This function will try to read count bytes from file f into buffer.
/// This function should be called repeatedly until true.
/// \param buffer The target buffer.
/// \param count Amount of bytes to read.
/// \param sofar Current amount read.
/// \param f File to read from.
/// \return True if count bytes are read succesfully, false otherwise.
bool FLV::Tag::FileReadUntil(char *buffer, unsigned int count, unsigned int &sofar, FILE *f){
if (sofar >= count){return true;}
int r = 0;
r = fread(buffer + sofar, 1, count - sofar, f);
if (r < 0){
FLV::Parse_Error = true;
Error_Str = "File reading error.";
return false;
}
sofar += r;
if (sofar >= count){return true;}
return false;
}
/// Try to load a tag from a file.
/// This is a stateful function - if fed incorrect data, it will most likely never return true
/// again! While this function returns false, the Tag might not contain valid data. \param f The
/// file to read from. \return True if a whole tag is succesfully read, false otherwise.
bool FLV::Tag::FileLoader(FILE *f){
int preflags = fcntl(fileno(f), F_GETFL, 0);
int postflags = preflags | O_NONBLOCK;
fcntl(fileno(f), F_SETFL, postflags);
if (len < 15){len = 15;}
if (!checkBufferSize()){return false;}
if (done){
// read a header
if (FileReadUntil(data, 11, sofar, f)){
// if its a correct FLV header, throw away and read tag header
if (FLV::is_header(data)){
if (FileReadUntil(data, 13, sofar, f)){
if (FLV::check_header(data)){
sofar = 0;
memcpy(FLV::Header, data, 13);
}else{
FLV::Parse_Error = true;
Error_Str = "Invalid header received.";
return false;
}
}else{
Util::sleep(100); // sleep 100ms
}
}else{
// if a tag header, calculate length and read tag body
len = data[3] + 15;
len += (data[2] << 8);
len += (data[1] << 16);
if (!checkBufferSize()){return false;}
if (data[0] > 0x12){
data[0] += 32;
FLV::Parse_Error = true;
Error_Str = "Invalid Tag received (";
Error_Str += data[0];
Error_Str += ").";
return false;
}
done = false;
}
}else{
Util::sleep(100); // sleep 100ms
}
}else{
// read tag body
if (FileReadUntil(data, len, sofar, f)){
// calculate keyframeness, next time read header again, return true
isKeyframe = ((data[0] == 0x09) && (((data[11] & 0xf0) >> 4) == 1));
done = true;
sofar = 0;
fcntl(fileno(f), F_SETFL, preflags);
return true;
}else{
Util::sleep(100); // sleep 100ms
}
}
fcntl(fileno(f), F_SETFL, preflags);
return false;
}// FLV_GetPacket
/// Returns 1 for video, 2 for audio, 3 for meta, 0 otherwise.
unsigned int FLV::Tag::getTrackID(){
switch (data[0]){
case 0x08: return 2; // audio track
case 0x09: return 1; // video track
case 0x12: return 3; // meta track
default: return 0;
}
}
/// Returns a pointer to the raw media data for this packet.
char *FLV::Tag::getData(){
if (data[0] == 0x08 && (data[11] & 0xF0) == 0xA0){return data + 13;}
if (data[0] == 0x09 && (data[11] & 0x0F) == 7){return data + 16;}
return data + 12;
}
/// Returns the length of the raw media data for this packet.
unsigned int FLV::Tag::getDataLen(){
if (data[0] == 0x08 && (data[11] & 0xF0) == 0xA0){
if (len < 17){return 0;}
return len - 17;
}
if (data[0] == 0x09 && (data[11] & 0x0F) == 7){
if (len < 20){return 0;}
return len - 20;
}
if (len < 16){return 0;}
return len - 16;
}
void FLV::Tag::toMeta(DTSC::Meta &metadata, AMF::Object &amf_storage, unsigned int reTrack){
if (!reTrack){
switch (data[0]){
case 0x09: reTrack = 1; break; // video
case 0x08: reTrack = 2; break; // audio
case 0x12: reTrack = 3; break; // meta
}
}
if (data[0] == 0x12){
AMF::Object meta_in = AMF::parse((unsigned char *)data + 11, len - 15);
AMF::Object *tmp = 0;
if (meta_in.getContentP(1) && meta_in.getContentP(0) && (meta_in.getContentP(0)->StrValue() == "onMetaData")){
tmp = meta_in.getContentP(1);
}else{
if (meta_in.getContentP(2) && meta_in.getContentP(1) && (meta_in.getContentP(1)->StrValue() == "onMetaData")){
tmp = meta_in.getContentP(2);
}
}
if (tmp){amf_storage = *tmp;}
return;
}
if (data[0] == 0x08 && (metadata.tracks[reTrack].codec == "" || metadata.tracks[reTrack].codec != getAudioCodec() ||
(needsInitData() && isInitData()))){
char audiodata = data[11];
metadata.tracks[reTrack].trackID = reTrack;
metadata.tracks[reTrack].type = "audio";
metadata.tracks[reTrack].codec = getAudioCodec();
switch (audiodata & 0x0C){
case 0x0: metadata.tracks[reTrack].rate = 5512; break;
case 0x4: metadata.tracks[reTrack].rate = 11025; break;
case 0x8: metadata.tracks[reTrack].rate = 22050; break;
case 0xC: metadata.tracks[reTrack].rate = 44100; break;
}
if (amf_storage.getContentP("audiosamplerate")){
metadata.tracks[reTrack].rate = (long long int)amf_storage.getContentP("audiosamplerate")->NumValue();
}
switch (audiodata & 0x02){
case 0x0: metadata.tracks[reTrack].size = 8; break;
case 0x2: metadata.tracks[reTrack].size = 16; break;
}
if (amf_storage.getContentP("audiosamplesize")){
metadata.tracks[reTrack].size = (long long int)amf_storage.getContentP("audiosamplesize")->NumValue();
}
switch (audiodata & 0x01){
case 0x0: metadata.tracks[reTrack].channels = 1; break;
case 0x1: metadata.tracks[reTrack].channels = 2; break;
}
if (amf_storage.getContentP("stereo")){
if (amf_storage.getContentP("stereo")->NumValue() == 1){
metadata.tracks[reTrack].channels = 2;
}else{
metadata.tracks[reTrack].channels = 1;
}
}
if (needsInitData() && isInitData()){
if ((audiodata & 0xF0) == 0xA0){
metadata.tracks[reTrack].init = std::string((char *)data + 13, (size_t)len - 17);
}else{
metadata.tracks[reTrack].init = std::string((char *)data + 12, (size_t)len - 16);
}
if (metadata.tracks[reTrack].codec == "AAC"){
metadata.tracks[reTrack].rate = aac::AudSpecConf::rate(metadata.tracks[reTrack].init);
metadata.tracks[reTrack].channels = aac::AudSpecConf::channels(metadata.tracks[reTrack].init);
}
}
}
if (data[0] == 0x09 && ((needsInitData() && isInitData()) || !metadata.tracks[reTrack].codec.size())){
char videodata = data[11];
metadata.tracks[reTrack].codec = getVideoCodec();
metadata.tracks[reTrack].type = "video";
metadata.tracks[reTrack].trackID = reTrack;
if (amf_storage.getContentP("width")){
metadata.tracks[reTrack].width = (long long int)amf_storage.getContentP("width")->NumValue();
}
if (amf_storage.getContentP("height")){
metadata.tracks[reTrack].height = (long long int)amf_storage.getContentP("height")->NumValue();
}
if (!metadata.tracks[reTrack].fpks && amf_storage.getContentP("videoframerate")){
if (amf_storage.getContentP("videoframerate")->NumValue()){
metadata.tracks[reTrack].fpks =
(long long int)(amf_storage.getContentP("videoframerate")->NumValue() * 1000.0);
}else{
metadata.tracks[reTrack].fpks =
atoi(amf_storage.getContentP("videoframerate")->StrValue().c_str()) * 1000.0;
}
}
if (needsInitData() && isInitData()){
if ((videodata & 0x0F) == 7){
if (len < 21){return;}
metadata.tracks[reTrack].init = std::string((char *)data + 16, (size_t)len - 20);
}else{
if (len < 17){return;}
metadata.tracks[reTrack].init = std::string((char *)data + 12, (size_t)len - 16);
}
/// this is a hacky way around invalid FLV data (since it gets ignored nearly everywhere, but
/// we do need correct data...
if (!metadata.tracks[reTrack].width || !metadata.tracks[reTrack].height ||
!metadata.tracks[reTrack].fpks){
h264::sequenceParameterSet sps;
sps.fromDTSCInit(metadata.tracks[reTrack].init);
h264::SPSMeta spsChar = sps.getCharacteristics();
metadata.tracks[reTrack].width = spsChar.width;
metadata.tracks[reTrack].height = spsChar.height;
metadata.tracks[reTrack].fpks = spsChar.fps * 1000;
}
}
}
}
/// Checks if buf is large enough to contain len.
/// Attempts to resize data buffer if not/
/// \returns True if buffer is large enough, false otherwise.
bool FLV::Tag::checkBufferSize(){
if (buf < len || !data){
char *newdata = (char *)realloc(data, len);
// on realloc fail, retain the old data
if (newdata != 0){
data = newdata;
buf = len;
}else{
len = buf;
return false;
}
}
return true;
}
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