1133 lines
33 KiB
C++
1133 lines
33 KiB
C++
/// \file flv_tag.cpp
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/// Holds all code for the FLV namespace.
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#include "amf.h"
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#include "rtmpchunks.h"
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#include "flv_tag.h"
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#include "timing.h"
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#include <stdio.h> //for Tag::FileLoader
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#include <unistd.h> //for Tag::FileLoader
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#include <fcntl.h> //for Tag::FileLoader
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#include <stdlib.h> //malloc
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#include <string.h> //memcpy
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#include <sstream>
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/// Holds the last FLV header parsed.
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/// Defaults to a audio+video header on FLV version 0x01 if no header received yet.
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char FLV::Header[13] = {'F', 'L', 'V', 0x01, 0x05, 0, 0, 0, 0x09, 0, 0, 0, 0};
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bool FLV::Parse_Error = false; ///< This variable is set to true if a problem is encountered while parsing the FLV.
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std::string FLV::Error_Str = "";
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/// Checks a FLV Header for validness. Returns true if the header is valid, false
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/// if the header is not. Not valid can mean:
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/// - Not starting with the string "FLV".
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/// - The DataOffset is not 9 bytes.
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/// - The PreviousTagSize is not 0 bytes.
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///
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/// Note that we see PreviousTagSize as part of the FLV header, not part of the tag header!
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bool FLV::check_header(char * header){
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if (header[0] != 'F') return false;
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if (header[1] != 'L') return false;
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if (header[2] != 'V') return false;
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if (header[5] != 0) return false;
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if (header[6] != 0) return false;
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if (header[7] != 0) return false;
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if (header[8] != 0x09) return false;
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if (header[9] != 0) return false;
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if (header[10] != 0) return false;
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if (header[11] != 0) return false;
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if (header[12] != 0) return false;
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return true;
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} //FLV::check_header
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/// Checks the first 3 bytes for the string "FLV". Implementing a basic FLV header check,
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/// returning true if it is, false if not.
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bool FLV::is_header(char * header){
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if (header[0] != 'F') return false;
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if (header[1] != 'L') return false;
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if (header[2] != 'V') return false;
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return true;
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} //FLV::is_header
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/// True if this media type requires init data.
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/// Will always return false if the tag type is not 0x08 or 0x09.
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/// Returns true for H263, AVC (H264), AAC.
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/// \todo Check if MP3 does or does not require init data...
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bool FLV::Tag::needsInitData(){
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switch (data[0]){
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case 0x09:
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switch (data[11] & 0x0F){
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case 2:
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return true;
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break; //H263 requires init data
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case 7:
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return true;
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break; //AVC requires init data
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default:
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return false;
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break; //other formats do not
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}
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break;
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case 0x08:
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switch (data[11] & 0xF0){
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case 0x20:
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return false;
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break; //MP3 does not...? Unsure.
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case 0xA0:
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return true;
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break; //AAC requires init data
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case 0xE0:
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return false;
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break; //MP38kHz does not...?
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default:
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return false;
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break; //other formats do not
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}
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break;
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}
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return false; //only audio/video can require init data
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}
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/// True if current tag is init data for this media type.
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bool FLV::Tag::isInitData(){
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switch (data[0]){
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case 0x09:
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switch (data[11] & 0xF0){
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case 0x50:
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return true;
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break;
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}
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if ((data[11] & 0x0F) == 7){
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switch (data[12]){
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case 0:
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return true;
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break;
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}
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}
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break;
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case 0x08:
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if ((data[12] == 0) && ((data[11] & 0xF0) == 0xA0)){
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return true;
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}
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break;
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}
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return false;
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}
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const char * FLV::Tag::getVideoCodec(){
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switch (data[11] & 0x0F){
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case 1:
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return "JPEG";
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case 2:
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return "H263";
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case 3:
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return "ScreenVideo1";
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case 4:
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return "VP6";
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case 5:
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return "VP6Alpha";
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case 6:
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return "ScreenVideo2";
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case 7:
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return "H264";
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default:
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return "unknown";
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}
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}
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const char * FLV::Tag::getAudioCodec(){
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switch (data[11] & 0xF0){
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case 0x00:
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return "linear PCM PE";
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case 0x10:
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return "ADPCM";
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case 0x20:
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return "MP3";
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case 0x30:
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return "linear PCM LE";
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case 0x40:
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return "Nelly16kHz";
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case 0x50:
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return "Nelly8kHz";
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case 0x60:
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return "Nelly";
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case 0x70:
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return "G711A-law";
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case 0x80:
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return "G711mu-law";
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case 0x90:
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return "reserved";
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case 0xA0:
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return "AAC";
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case 0xB0:
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return "Speex";
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case 0xE0:
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return "MP38kHz";
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case 0xF0:
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return "DeviceSpecific";
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default:
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return "unknown";
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}
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}
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/// Returns a std::string describing the tag in detail.
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/// The string includes information about whether the tag is
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/// audio, video or metadata, what encoding is used, and the details
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/// of the encoding itself.
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std::string FLV::Tag::tagType(){
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std::stringstream R;
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R << len << " bytes of ";
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switch (data[0]){
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case 0x09:
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R << getVideoCodec() << " video ";
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switch (data[11] & 0xF0){
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case 0x10:
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R << "keyframe";
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break;
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case 0x20:
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R << "iframe";
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break;
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case 0x30:
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R << "disposableiframe";
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break;
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case 0x40:
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R << "generatedkeyframe";
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break;
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case 0x50:
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R << "videoinfo";
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break;
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}
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if ((data[11] & 0x0F) == 7){
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switch (data[12]){
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case 0:
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R << " header";
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break;
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case 1:
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R << " NALU";
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break;
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case 2:
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R << " endofsequence";
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break;
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}
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}
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break;
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case 0x08:
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R << getAudioCodec();
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switch (data[11] & 0x0C){
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case 0x0:
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R << " 5.5kHz";
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break;
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case 0x4:
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R << " 11kHz";
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break;
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case 0x8:
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R << " 22kHz";
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break;
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case 0xC:
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R << " 44kHz";
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break;
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}
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switch (data[11] & 0x02){
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case 0:
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R << " 8bit";
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break;
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case 2:
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R << " 16bit";
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break;
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}
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switch (data[11] & 0x01){
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case 0:
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R << " mono";
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break;
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case 1:
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R << " stereo";
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break;
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}
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R << " audio";
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if ((data[12] == 0) && ((data[11] & 0xF0) == 0xA0)){
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R << " initdata";
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}
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break;
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case 0x12: {
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R << "(meta)data: ";
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AMF::Object metadata = AMF::parse((unsigned char*)data + 11, len - 15);
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R << metadata.Print();
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break;
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}
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default:
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R << "unknown";
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break;
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}
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return R.str();
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} //FLV::Tag::tagtype
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/// Returns the 24-bit offset of this tag.
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/// Returns 0 if the tag isn't H264
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int FLV::Tag::offset(){
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return (((data[13] << 16) + (data[14] << 8) + data[15]) << 8) >> 8;
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} //offset getter
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/// Sets the 24-bit offset of this tag.
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/// Ignored if the tag isn't H264
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void FLV::Tag::offset(int o){
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data[13] = (o >> 16) & 0xFF;
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data[14] = (o >> 8) & 0XFF;
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data[15] = o & 0xFF;
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} //offset setter
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/// Returns the 32-bit timestamp of this tag.
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unsigned int FLV::Tag::tagTime(){
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return (data[4] << 16) + (data[5] << 8) + data[6] + (data[7] << 24);
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} //tagTime getter
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/// Sets the 32-bit timestamp of this tag.
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void FLV::Tag::tagTime(unsigned int T){
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data[4] = ((T >> 16) & 0xFF);
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data[5] = ((T >> 8) & 0xFF);
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data[6] = (T & 0xFF);
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data[7] = ((T >> 24) & 0xFF);
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} //tagTime setter
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/// Constructor for a new, empty, tag.
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/// The buffer length is initialized to 0, and later automatically
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/// increased if neccesary.
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FLV::Tag::Tag(){
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len = 0;
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buf = 0;
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data = 0;
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isKeyframe = false;
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done = true;
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sofar = 0;
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} //empty constructor
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/// Copy constructor, copies the contents of an existing tag.
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/// The buffer length is initialized to the actual size of the tag
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/// that is being copied, and later automaticallt increased if
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/// neccesary.
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FLV::Tag::Tag(const Tag& O){
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done = true;
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sofar = 0;
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len = O.len;
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data = 0;
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if (len > 0){
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if (checkBufferSize()){
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memcpy(data, O.data, len);
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}
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}
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isKeyframe = O.isKeyframe;
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} //copy constructor
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/// Copy constructor from a RTMP chunk.
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/// Copies the contents of a RTMP chunk into a valid FLV tag.
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/// Exactly the same as making a chunk by through the default (empty) constructor
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/// and then calling FLV::Tag::ChunkLoader with the chunk as argument.
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FLV::Tag::Tag(const RTMPStream::Chunk& O){
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len = 0;
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buf = 0;
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data = 0;
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isKeyframe = false;
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done = true;
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sofar = 0;
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ChunkLoader(O);
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}
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/// Generic destructor that frees the allocated memory in the internal data variable, if any.
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FLV::Tag::~Tag(){
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if (data){
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free(data);
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data = 0;
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buf = 0;
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len = 0;
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}
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}
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/// Assignment operator - works exactly like the copy constructor.
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/// This operator checks for self-assignment.
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FLV::Tag & FLV::Tag::operator=(const FLV::Tag& O){
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if (this != &O){ //no self-assignment
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len = O.len;
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if (len > 0){
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if (checkBufferSize()){
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memcpy(data, O.data, len);
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}else{
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len = buf;
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}
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}
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isKeyframe = O.isKeyframe;
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}
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return *this;
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} //assignment operator
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/// FLV loader function from DTSC.
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/// Takes the DTSC data and makes it into FLV.
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bool FLV::Tag::DTSCLoader(DTSC::Stream & S){
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std::string meta_str;
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DTSC::Track & track = S.metadata.tracks[S.getPacket()["trackid"].asInt()];
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switch (S.lastType()){
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case DTSC::VIDEO:
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len = S.lastData().length() + 16;
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if (track.codec == "H264"){
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len += 4;
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}
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break;
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case DTSC::AUDIO:
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len = S.lastData().length() + 16;
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if (track.codec == "AAC"){
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len += 1;
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}
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break;
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case DTSC::META:{
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AMF::Object amfdata("root", AMF::AMF0_DDV_CONTAINER);
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amfdata.addContent(AMF::Object("", "onMetaData"));
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amfdata.addContent(AMF::Object("", AMF::AMF0_ECMA_ARRAY));
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for (JSON::ObjIter it = S.getPacket()["data"].ObjBegin(); it != S.getPacket()["data"].ObjEnd(); it++){
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if (it->second.asInt()){
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amfdata.getContentP(1)->addContent(AMF::Object(it->first, it->second.asInt(), AMF::AMF0_NUMBER));
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}else{
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amfdata.getContentP(1)->addContent(AMF::Object(it->first, it->second.asString(), AMF::AMF0_STRING));
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}
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}
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meta_str = amfdata.Pack();
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len = meta_str.length() + 15;
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break;
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}
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default: //ignore all other types (there are currently no other types...)
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return false;
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break;
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}
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if (len > 0){
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if ( !checkBufferSize()){
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return false;
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}
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switch (S.lastType()){
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case DTSC::VIDEO:
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if ((unsigned int)len == S.lastData().length() + 16){
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memcpy(data + 12, S.lastData().c_str(), S.lastData().length());
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}else{
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memcpy(data + 16, S.lastData().c_str(), S.lastData().length());
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if (S.getPacket().isMember("nalu")){
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data[12] = 1;
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}else{
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data[12] = 2;
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}
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offset(S.getPacket()["offset"].asInt());
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}
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data[11] = 0;
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if (track.codec == "H264"){
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data[11] += 7;
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}
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if (track.codec == "H263"){
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data[11] += 2;
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}
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if (S.getPacket().isMember("keyframe")){
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data[11] += 0x10;
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}
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if (S.getPacket().isMember("interframe")){
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data[11] += 0x20;
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}
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if (S.getPacket().isMember("disposableframe")){
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data[11] += 0x30;
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}
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break;
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case DTSC::AUDIO: {
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if ((unsigned int)len == S.lastData().length() + 16){
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memcpy(data + 12, S.lastData().c_str(), S.lastData().length());
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}else{
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memcpy(data + 13, S.lastData().c_str(), S.lastData().length());
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data[12] = 1; //raw AAC data, not sequence header
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}
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data[11] = 0;
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if (track.codec == "AAC"){
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data[11] += 0xA0;
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}
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if (track.codec == "MP3"){
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data[11] += 0x20;
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}
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unsigned int datarate = track.rate;
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if (datarate >= 44100){
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data[11] += 0x0C;
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}else if (datarate >= 22050){
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data[11] += 0x08;
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}else if (datarate >= 11025){
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data[11] += 0x04;
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}
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if (track.size == 16){
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data[11] += 0x02;
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}
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if (track.channels > 1){
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data[11] += 0x01;
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}
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break;
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}
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case DTSC::META:
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memcpy(data + 11, meta_str.c_str(), meta_str.length());
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break;
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default:
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break;
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}
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}
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setLen();
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switch (S.lastType()){
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case DTSC::VIDEO:
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data[0] = 0x09;
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break;
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case DTSC::AUDIO:
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data[0] = 0x08;
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break;
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case DTSC::META:
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data[0] = 0x12;
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break;
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default:
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break;
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}
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data[1] = ((len - 15) >> 16) & 0xFF;
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data[2] = ((len - 15) >> 8) & 0xFF;
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data[3] = (len - 15) & 0xFF;
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data[8] = 0;
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data[9] = 0;
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data[10] = 0;
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tagTime(S.getPacket()["time"].asInt());
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return true;
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}
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/// Helper function that properly sets the tag length from the internal len variable.
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void FLV::Tag::setLen(){
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int len4 = len - 4;
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int i = len;
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data[ --i] = (len4) & 0xFF;
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len4 >>= 8;
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data[ --i] = (len4) & 0xFF;
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len4 >>= 8;
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data[ --i] = (len4) & 0xFF;
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len4 >>= 8;
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data[ --i] = (len4) & 0xFF;
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}
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|
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/// FLV Video init data loader function from JSON.
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bool FLV::Tag::DTSCVideoInit(DTSC::Track & video){
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//Unknown? Assume H264.
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if (video.codec == "?"){
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video.codec = "H264";
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}
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if (video.codec == "H264"){
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len = video.init.size() + 20;
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}
|
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if (len > 0){
|
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if ( !checkBufferSize()){
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return false;
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}
|
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memcpy(data + 16, video.init.c_str(), len - 20);
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data[12] = 0; //H264 sequence header
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data[13] = 0;
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data[14] = 0;
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data[15] = 0;
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data[11] = 0x17; //H264 keyframe (0x07 & 0x10)
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}
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setLen();
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data[0] = 0x09;
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data[1] = ((len - 15) >> 16) & 0xFF;
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data[2] = ((len - 15) >> 8) & 0xFF;
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data[3] = (len - 15) & 0xFF;
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data[8] = 0;
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data[9] = 0;
|
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data[10] = 0;
|
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tagTime(0);
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return true;
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|
}
|
|
|
|
/// FLV Audio init data loader function from JSON.
|
|
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){
|
|
if ( !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 == 16){
|
|
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;
|
|
}
|
|
|
|
/// FLV metadata loader function from DTSC.
|
|
/// Takes the DTSC metadata and makes it into FLV.
|
|
/// Assumes metadata is available - so check before calling!
|
|
bool FLV::Tag::DTSCMetaInit(DTSC::Stream & S, DTSC::Track & videoRef, DTSC::Track & audioRef){
|
|
//Unknown? Assume AAC.
|
|
if (audioRef.codec == "?"){
|
|
audioRef.codec = "AAC";
|
|
}
|
|
//Unknown? Assume H264.
|
|
if (videoRef.codec == "?"){
|
|
videoRef.codec = "H264";
|
|
}
|
|
|
|
AMF::Object amfdata("root", AMF::AMF0_DDV_CONTAINER);
|
|
|
|
amfdata.addContent(AMF::Object("", "onMetaData"));
|
|
amfdata.addContent(AMF::Object("", AMF::AMF0_ECMA_ARRAY));
|
|
if (S.metadata.vod){
|
|
amfdata.getContentP(1)->addContent(AMF::Object("duration", videoRef.lastms / 1000, AMF::AMF0_NUMBER));
|
|
amfdata.getContentP(1)->addContent(AMF::Object("moovPosition", 40, AMF::AMF0_NUMBER));
|
|
AMF::Object keys("keyframes", AMF::AMF0_OBJECT);
|
|
keys.addContent(AMF::Object("filepositions", AMF::AMF0_STRICT_ARRAY));
|
|
keys.addContent(AMF::Object("times", AMF::AMF0_STRICT_ARRAY));
|
|
int total_byterate = 0;
|
|
if (videoRef){
|
|
total_byterate += videoRef.bps;
|
|
}
|
|
if (audioRef){
|
|
total_byterate += audioRef.bps;
|
|
}
|
|
for (int i = 0; i < videoRef.lastms / 1000; ++i){ //for each second in the file
|
|
keys.getContentP(0)->addContent(AMF::Object("", i * total_byterate, AMF::AMF0_NUMBER)); //multiply by byterate for fake byte positions
|
|
keys.getContentP(1)->addContent(AMF::Object("", i, AMF::AMF0_NUMBER)); //seconds
|
|
}
|
|
amfdata.getContentP(1)->addContent(keys);
|
|
}
|
|
if (videoRef){
|
|
amfdata.getContentP(1)->addContent(AMF::Object("hasVideo", 1, AMF::AMF0_BOOL));
|
|
if (videoRef.codec == "H264"){
|
|
amfdata.getContentP(1)->addContent(AMF::Object("videocodecid", (std::string)"avc1"));
|
|
}
|
|
if (videoRef.codec == "VP6"){
|
|
amfdata.getContentP(1)->addContent(AMF::Object("videocodecid", 4, AMF::AMF0_NUMBER));
|
|
}
|
|
if (videoRef.codec == "H263"){
|
|
amfdata.getContentP(1)->addContent(AMF::Object("videocodecid", 2, AMF::AMF0_NUMBER));
|
|
}
|
|
amfdata.getContentP(1)->addContent(AMF::Object("width", videoRef.width, AMF::AMF0_NUMBER));
|
|
amfdata.getContentP(1)->addContent(AMF::Object("height", videoRef.height, AMF::AMF0_NUMBER));
|
|
amfdata.getContentP(1)->addContent(AMF::Object("videoframerate", (double)videoRef.fpks / 1000.0, AMF::AMF0_NUMBER));
|
|
amfdata.getContentP(1)->addContent(AMF::Object("videodatarate", (double)videoRef.bps * 128.0, AMF::AMF0_NUMBER));
|
|
}
|
|
if (audioRef){
|
|
amfdata.getContentP(1)->addContent(AMF::Object("hasAudio", 1, AMF::AMF0_BOOL));
|
|
amfdata.getContentP(1)->addContent(AMF::Object("audiodelay", 0, AMF::AMF0_NUMBER));
|
|
if (audioRef.codec == "AAC"){
|
|
amfdata.getContentP(1)->addContent(AMF::Object("audiocodecid", (std::string)"mp4a"));
|
|
}
|
|
if (audioRef.codec == "MP3"){
|
|
amfdata.getContentP(1)->addContent(AMF::Object("audiocodecid", (std::string)"mp3"));
|
|
}
|
|
amfdata.getContentP(1)->addContent(AMF::Object("audiochannels", audioRef.channels, AMF::AMF0_NUMBER));
|
|
amfdata.getContentP(1)->addContent(AMF::Object("audiosamplerate", audioRef.rate, AMF::AMF0_NUMBER));
|
|
amfdata.getContentP(1)->addContent(AMF::Object("audiosamplesize", audioRef.size, AMF::AMF0_NUMBER));
|
|
amfdata.getContentP(1)->addContent(AMF::Object("audiodatarate", (double)audioRef.bps * 128.0, AMF::AMF0_NUMBER));
|
|
}
|
|
AMF::Object trinfo = AMF::Object("trackinfo", AMF::AMF0_STRICT_ARRAY);
|
|
int i = 0;
|
|
if (audioRef){
|
|
trinfo.addContent(AMF::Object("", AMF::AMF0_OBJECT));
|
|
trinfo.getContentP(i)->addContent(AMF::Object("length", ((double)audioRef.lastms) * ((double)audioRef.rate), AMF::AMF0_NUMBER));
|
|
trinfo.getContentP(i)->addContent(AMF::Object("timescale", audioRef.rate, AMF::AMF0_NUMBER));
|
|
trinfo.getContentP(i)->addContent(AMF::Object("sampledescription", AMF::AMF0_STRICT_ARRAY));
|
|
if (audioRef.codec == "AAC"){
|
|
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string)"mp4a"));
|
|
}
|
|
if (audioRef.codec == "MP3"){
|
|
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string)"mp3"));
|
|
}
|
|
++i;
|
|
}
|
|
if (videoRef){
|
|
trinfo.addContent(AMF::Object("", AMF::AMF0_OBJECT));
|
|
trinfo.getContentP(i)->addContent(
|
|
AMF::Object("length", ((double)videoRef.lastms / 1000) * ((double)videoRef.fpks / 1000.0), AMF::AMF0_NUMBER));
|
|
trinfo.getContentP(i)->addContent(AMF::Object("timescale", ((double)videoRef.fpks / 1000.0), AMF::AMF0_NUMBER));
|
|
trinfo.getContentP(i)->addContent(AMF::Object("sampledescription", AMF::AMF0_STRICT_ARRAY));
|
|
if (videoRef.codec == "H264"){
|
|
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string)"avc1"));
|
|
}
|
|
if (videoRef.codec == "VP6"){
|
|
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string)"vp6"));
|
|
}
|
|
if (videoRef.codec == "H263"){
|
|
trinfo.getContentP(i)->getContentP(2)->addContent(AMF::Object("sampletype", (std::string)"h263"));
|
|
}
|
|
++i;
|
|
}
|
|
amfdata.getContentP(1)->addContent(trinfo);
|
|
|
|
std::string tmp = amfdata.Pack();
|
|
len = tmp.length() + 15;
|
|
if (len > 0){
|
|
if (checkBufferSize()){
|
|
memcpy(data + 11, tmp.c_str(), len - 15);
|
|
}else{
|
|
return false;
|
|
}
|
|
}
|
|
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);
|
|
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
|
|
if ((data[0] == 0x09) && (((data[11] & 0xf0) >> 4) == 1)){
|
|
isKeyframe = true;
|
|
}else{
|
|
isKeyframe = false;
|
|
}
|
|
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
|
|
if ((data[0] == 0x09) && (((data[11] & 0xf0) >> 4) == 1)){
|
|
isKeyframe = true;
|
|
}else{
|
|
isKeyframe = false;
|
|
}
|
|
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
|
|
|
|
JSON::Value FLV::Tag::toJSON(DTSC::Meta & metadata){
|
|
JSON::Value pack_out; // Storage for outgoing metadata.
|
|
|
|
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){
|
|
if (tmp->getContentP("width")){
|
|
metadata.tracks[1].width = (long long int)tmp->getContentP("width")->NumValue();
|
|
}
|
|
if (tmp->getContentP("height")){
|
|
metadata.tracks[1].height = (long long int)tmp->getContentP("height")->NumValue();
|
|
}
|
|
if (tmp->getContentP("framerate")){
|
|
metadata.tracks[1].fpks = (long long int)(tmp->getContentP("framerate")->NumValue() * 1000.0);
|
|
}
|
|
if (tmp->getContentP("videodatarate")){
|
|
metadata.tracks[1].bps = (long long int)(tmp->getContentP("videodatarate")->NumValue() * 1024) / 8;
|
|
}
|
|
if (tmp->getContentP("audiodatarate")){
|
|
metadata.tracks[2].bps = (long long int)(tmp->getContentP("audiodatarate")->NumValue() * 1024) / 8;
|
|
}
|
|
if (tmp->getContentP("audiosamplerate")){
|
|
metadata.tracks[2].rate = (long long int)tmp->getContentP("audiosamplerate")->NumValue();
|
|
}
|
|
if (tmp->getContentP("audiosamplesize")){
|
|
metadata.tracks[2].size = (long long int)tmp->getContentP("audiosamplesize")->NumValue();
|
|
}
|
|
if (tmp->getContentP("stereo")){
|
|
if (tmp->getContentP("stereo")->NumValue() == 1){
|
|
metadata.tracks[2].channels = 2;
|
|
}else{
|
|
metadata.tracks[2].channels = 1;
|
|
}
|
|
}
|
|
for (int i = 0; i < tmp->hasContent(); ++i){
|
|
if (tmp->getContentP(i)->Indice() == "videocodecid" || tmp->getContentP(i)->Indice() == "audiocodecid" || tmp->getContentP(i)->Indice() == "width" || tmp->getContentP(i)->Indice() == "height" || tmp->getContentP(i)->Indice() == "framerate" || tmp->getContentP(i)->Indice() == "videodatarate" || tmp->getContentP(i)->Indice() == "audiodatarate" || tmp->getContentP(i)->Indice() == "audiosamplerate" || tmp->getContentP(i)->Indice() == "audiosamplesize" || tmp->getContentP(i)->Indice() == "audiochannels"){
|
|
continue;
|
|
}
|
|
if (tmp->getContentP(i)->NumValue()){
|
|
pack_out["data"][tmp->getContentP(i)->Indice()] = (long long)tmp->getContentP(i)->NumValue();
|
|
}else{
|
|
if (tmp->getContentP(i)->StrValue() != ""){
|
|
pack_out["data"][tmp->getContentP(i)->Indice()] = tmp->getContentP(i)->StrValue();
|
|
}
|
|
}
|
|
}
|
|
if (pack_out){
|
|
pack_out["datatype"] = "meta";
|
|
pack_out["time"] = tagTime();
|
|
}
|
|
}
|
|
return pack_out; //empty
|
|
}
|
|
if (data[0] == 0x08){
|
|
char audiodata = data[11];
|
|
if (needsInitData() && isInitData()){
|
|
if ((audiodata & 0xF0) == 0xA0){
|
|
metadata.tracks[2].init = std::string((char*)data + 13, (size_t)len - 17);
|
|
}else{
|
|
metadata.tracks[2].init = std::string((char*)data + 12, (size_t)len - 16);
|
|
}
|
|
return pack_out; //skip rest of parsing, get next tag.
|
|
}
|
|
pack_out["time"] = tagTime();
|
|
pack_out["trackid"] = 2;
|
|
metadata.tracks[2].trackID = 2;
|
|
metadata.tracks[2].type = "audio";
|
|
if (metadata.tracks[2].codec == ""){
|
|
metadata.tracks[2].codec = getAudioCodec();
|
|
}
|
|
if ( !metadata.tracks[2].rate){
|
|
switch (audiodata & 0x0C){
|
|
case 0x0:
|
|
metadata.tracks[2].rate = 5512;
|
|
break;
|
|
case 0x4:
|
|
metadata.tracks[2].rate = 11025;
|
|
break;
|
|
case 0x8:
|
|
metadata.tracks[2].rate = 22050;
|
|
break;
|
|
case 0xC:
|
|
metadata.tracks[2].rate = 44100;
|
|
break;
|
|
}
|
|
}
|
|
if ( !metadata.tracks[2].size){
|
|
switch (audiodata & 0x02){
|
|
case 0x0:
|
|
metadata.tracks[2].size = 8;
|
|
break;
|
|
case 0x2:
|
|
metadata.tracks[2].size = 16;
|
|
break;
|
|
}
|
|
}
|
|
if ( !metadata.tracks[2].channels){
|
|
switch (audiodata & 0x01){
|
|
case 0x0:
|
|
metadata.tracks[2].channels = 1;
|
|
break;
|
|
case 0x1:
|
|
metadata.tracks[2].channels = 2;
|
|
break;
|
|
}
|
|
}
|
|
if ((audiodata & 0xF0) == 0xA0){
|
|
if (len < 18){
|
|
return JSON::Value();
|
|
}
|
|
pack_out["data"] = std::string((char*)data + 13, (size_t)len - 17);
|
|
}else{
|
|
if (len < 17){
|
|
return JSON::Value();
|
|
}
|
|
pack_out["data"] = std::string((char*)data + 12, (size_t)len - 16);
|
|
}
|
|
return pack_out;
|
|
}
|
|
if (data[0] == 0x09){
|
|
char videodata = data[11];
|
|
if (needsInitData() && isInitData()){
|
|
if ((videodata & 0x0F) == 7){
|
|
if (len < 21){
|
|
return JSON::Value();
|
|
}
|
|
metadata.tracks[1].init = std::string((char*)data + 16, (size_t)len - 20);
|
|
}else{
|
|
if (len < 17){
|
|
return JSON::Value();
|
|
}
|
|
metadata.tracks[1].init = std::string((char*)data + 12, (size_t)len - 16);
|
|
}
|
|
return pack_out; //skip rest of parsing, get next tag.
|
|
}
|
|
if (metadata.tracks[1].codec == ""){
|
|
metadata.tracks[1].codec = getVideoCodec();
|
|
}
|
|
metadata.tracks[1].type = "video";
|
|
metadata.tracks[1].trackID = 1;
|
|
pack_out["trackid"] = 1;
|
|
switch (videodata & 0xF0){
|
|
case 0x10:
|
|
pack_out["keyframe"] = 1;
|
|
break;
|
|
case 0x20:
|
|
pack_out["interframe"] = 1;
|
|
break;
|
|
case 0x30:
|
|
pack_out["disposableframe"] = 1;
|
|
break;
|
|
case 0x40:
|
|
pack_out["keyframe"] = 1;
|
|
break;
|
|
case 0x50:
|
|
return JSON::Value();
|
|
break; //the video info byte we just throw away - useless to us...
|
|
}
|
|
pack_out["time"] = tagTime();
|
|
if ((videodata & 0x0F) == 7){
|
|
switch (data[12]){
|
|
case 1:
|
|
pack_out["nalu"] = 1;
|
|
break;
|
|
case 2:
|
|
pack_out["nalu_end"] = 1;
|
|
break;
|
|
}
|
|
pack_out["offset"] = offset();
|
|
if (len < 21){
|
|
return JSON::Value();
|
|
}
|
|
pack_out["data"] = std::string((char*)data + 16, (size_t)len - 20);
|
|
}else{
|
|
if (len < 17){
|
|
return JSON::Value();
|
|
}
|
|
pack_out["data"] = std::string((char*)data + 12, (size_t)len - 16);
|
|
}
|
|
return pack_out;
|
|
}
|
|
return pack_out; //should never get here
|
|
} //FLV::Tag::toJSON
|
|
|
|
/// 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;
|
|
}
|