ESP32 - JPEGDecoder from SPIFFS

Question

Hello i've try to decode JPG image from FS so, i create and upload spiffs image (using /data directory and Arduino Ide Plugin )

On every jpg i've same error: "pjpeg_decode_init() failed with status 19"

here is my same code:

#include <TFT_eSPI.h> // Hardware-specific library
#include <SPI.h>
#include "GfxUi.h"
TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
#define DEBUG
#define LOAD_SPIFFS
GfxUi ui = GfxUi(&tft);
void writeFile(fs::FS &fs, const char * path, const char * message);
void readFile(fs::FS &fs, const char * path);
void listDir(fs::FS &fs, const char * dirname, uint8_t levels);
void setup(void)
{
 Serial.begin(115200);
 Serial.print("Start");
 SPIFFS.begin(true);
 tft.begin();
 tft.setRotation(3);
 tft.fillScreen(TFT_BLACK);
 listDir(SPIFFS, "/", 0);
 fs::File jpeg = SPIFFS.open("/star.jpg", "r");
 //readFile(SPIFFS, "/star.jpg");
 boolean decoded = JpegDec.decodeFsFile(jpeg);
 Serial.println("===============");
 Serial.println("JPEG image info");
 Serial.println("===============");
 Serial.print ("Width :"); Serial.println(JpegDec.width);
 Serial.print ("Height :"); Serial.println(JpegDec.height);
 Serial.print ("Components :"); Serial.println(JpegDec.comps);
 Serial.print ("MCU / row :"); Serial.println(JpegDec.MCUSPerRow);
 Serial.print ("MCU / col :"); Serial.println(JpegDec.MCUSPerCol);
 Serial.print ("Scan type :"); Serial.println(JpegDec.scanType);
 Serial.print ("MCU width :"); Serial.println(JpegDec.MCUWidth);
 Serial.print ("MCU height :"); Serial.println(JpegDec.MCUHeight);
 Serial.println("===============");
 Serial.println("");
}
void listDir(fs::FS &fs, const char * dirname, uint8_t levels){
 Serial.printf("Listing directory: %s\r\n", dirname);
 File root = fs.open(dirname);
 if(!root){
 Serial.println("- failed to open directory");
 return;
 }
 if(!root.isDirectory()){
 Serial.println(" - not a directory");
 return;
 }
 File file = root.openNextFile();
 while(file){
 if(file.isDirectory()){
 Serial.print(" DIR : ");
 Serial.println(file.name());
 if(levels){
 listDir(fs, file.name(), levels -1);
 }
 } else {
 Serial.print(" FILE: ");
 Serial.print(file.name());
 Serial.print("\tSIZE: ");
 Serial.println(file.size());
 }
 file = root.openNextFile();
 }
}
void readFile(fs::FS &fs, const char * path){
 Serial.printf("Reading file: %s\r\n", path);
 File file = fs.open(path);
 if(!file || file.isDirectory()){
 Serial.println("- failed to open file for reading");
 return;
 }
 Serial.println("- read from file:");
 while(file.available()){
 Serial.write(file.read());
 }
}
void writeFile(fs::FS &fs, const char * path, const char * message){
 Serial.printf("Writing file: %s\r\n", path);
 File file = fs.open(path, FILE_WRITE);
 if(!file){
 Serial.println("- failed to open file for writing");
 return;
 }
 if(file.print(message)){
 Serial.println("- file written");
 } else {
 Serial.println("- frite failed");
 }
}
void loop() {
}

Output from serial:

Listing directory: /
 FILE: /logo.jpg SIZE: 16346
 FILE: /arduino.jpg SIZE: 8426
 FILE: /star.jpg SIZE: 3853
pjpeg_decode_init() failed with status 19 <--- here is
===============
JPEG image info
===============
Width :0
Height :0
Components :0
MCU / row :0
MCU / col :0
Scan type :0
MCU width :0
MCU height :0
===============

• Juraj: 19 is PJPG_NOT_JPEG github.com/Bodmer/JPEGDecoder/blob/master/src/picojpeg.h
• Juraj: you should add a test if (jpeg) for file existence.

Answer 1

as far as I can determine uploading to SPIFFS via the Arduino IDE is broken as of the beginning of 2018. The files are uploaded but are corrupted on a read. There are a few fixes reported. I am using a core from Dec 2017 and that works fine.