devongovett / jpg-stream Goto Github PK

I get the following message when i want to extract Exif data from around 400 jpeg files. I never seen this message, and have no clue, how to solve this.

Cannot enlarge memory arrays. Either (1) compile with -s TOTAL_MEMORY=X with X higher than the current value 33554432, (2) compile with ALLOW_MEMORY_GROWTH which adjusts the size at runtime but prevents some optimizations, or (3) set Module.TOTAL_MEMORY before the program runs.
Cannot enlarge memory arrays. Either (1) compile with -s TOTAL_MEMORY=X with X higher than the current value 33554432, (2) compile with ALLOW_MEMORY_GROWTH which adjusts the size at runtime but prevents some optimizations, or (3) set Module.TOTAL_MEMORY before the program runs.

/var/development/node_modules/jpg-stream/build/jpeg.js:1
(function (exports, require, module, __filename, __dirname) { var Module;if(!Module)Module=(typeof Module!=="undefined"?Module:null)||{};var moduleOverrides={};for(var key in Module){if(Module.hasOwnProperty(key)){moduleOverrides[key]=Module[key]}}var ENVIRONMENT_IS_NODE=typeof process==="object"&&typeof require==="function";var ENVIRONMENT_IS_WEB=typeof window==="object";var ENVIRONMENT_IS_WORKER=typeof importScripts==="function";var ENVIRONMENT_IS_SHELL=!ENVIRONMENT_IS_WEB&&!ENVIRONMENT_IS_NODE&&!ENVIRONMENT_IS_WORKER;if(ENVIRONMENT_IS_NODE){if(!Module["print"])Module["print"]=function print(x){process["stdout"].write(x+"\n")};if(!Module["printErr"])Module["printErr"]=function printErr(x){process["stderr"].write(x+"\n")};var nodeFS=require("fs");var nodePath=require("path");Module["read"]=function read(filename,binary){filename=nodePath"normalize";var ret=nodeFS"readFileSync";if(!ret&&filename!=nodePath"resolve"){
abort() at Error
at jsStackTrace (/var/development/node_modules/jpg-stream/build/jpeg.js:1:18435)
at stackTrace (/var/development/node_modules/jpg-stream/build/jpeg.js:1:18618)
at abort (/var/development/node_modules/jpg-stream/build/jpeg.js:42:35740)
at enlargeMemory (/var/development/node_modules/jpg-stream/build/jpeg.js:1:18951)
at Function.Runtime.dynamicAlloc as alloc
at _sbrk (/var/development/node_modules/jpg-stream/build/jpeg.js:1:122885)
at Ts (/var/development/node_modules/jpg-stream/build/jpeg.js:9:12346)
at Mi (/var/development/node_modules/jpg-stream/build/jpeg.js:29:62714)
at Array.Ni (/var/development/node_modules/jpg-stream/build/jpeg.js:29:63216)
at ng (/var/development/node_modules/jpg-stream/build/jpeg.js:17:61717)
If this abort() is unexpected, build with -s ASSERTIONS=1 which can give more information.

The code to compute the scaling ratio is:

  // Calculate scale so we only decode what we need
  if (desiredWidth && desiredHeight) {
    int wdeg = imageWidth / desiredWidth;
    int hdeg = imageHeight / desiredHeight;
    dec.scale_num = 1;
    dec.scale_denom = std::max(1, std::min(std::min(wdeg, hdeg), 8));
  }

However, the following article says:

Just set the desired scaling factor of N/8 (N=1...16) in the djpeg -scale option or via the scale_num/scale_denom variables in library application.

So I guess you should set the scale_denom to 8, and then compute the scale_num so that imageWidth * scale_num / 8 <= desiredWidth?

It would be nice if the README.md could either include or link to more documentation on how to use this library, or the structure a frame uses... are there a series of related libraries that are interchangable (there's mention of a png one)... what about simple transforms (resize, etc).

Very cool project, just interested in a little bit more.

The compiled output currently breaks in browserify. Offending line:

Module["thisProgram"]=process["argv"][1].replace(/\\/g,"/")

   Uncaught TypeError: Cannot read property 'replace' of undefined

It also relies on other features like process.stdout etc.