Audio asset for 3x

[andy55]

Hi all

Every time I try to create a . Ima file to play back audio the results are very poor
The sample file , mezermirize .ima file plays fine

Is there a method that someone can share to properly prepare the audio files for playback
I have tried multiple tools with no success
Maybe removing the header file and metadata ?
I tried the bridge works tools, with no success as well

Any help would be greatly appreciated

[tftlcdcyg]

Personally I use the sox tool (http://sox.sourceforge.net/). I follow these steps and I think that you can get an acceptable quality of ima files

1 Download the conversion tool

sox.sourceforge.net/

The latest version is 14.4.2, it works 100% in Windows 10 Pro 64-bit
sourceforge.net/projects/sox/files/sox/

2 Install sox in the folder c: \ sox

3 Add the folder c: \ sox to the environment variables so that it is recognized as a command by the windows powershell

4 Using an audio extractor from videos or some audio file conversion tool, get the audio-source track in wav format of a channel, name it with the format ********. wav
pistaX.wav, for example

5 In the windows command window enter the folder c: \ sox

6 Copy the audio track obtained in step 4, in the folder c: \ sox

7 In the command window enter the processing line of the sox command as:


sox pistaX.wav pista.ima channels 1 gain -3 norm -3 speed 1.1
We give enter. In the folder c: \ sox, the file pistaX.ima will appear

Remember that ima ADPCM files are audio files with a high degree of compression, so that some audio processing error can be added, which results in distortions or speed reductions when playing them.

The line I suggest: channels 1 gain -3 norm -3 speed 1.1 allows you to send the audio signal through a single channel, compensating the possible noise with gain and norm; adding a bit of speed to get the best possible quality.

There are many other commands that could improve the final file, but this is a trial and error process. I think with those elements, you can get a good file in ima format without so many weird distortions.


My personal IMA player (for the Teensy 4.x and SdFat party)


#include <GDT4Xv134.h>

const char song[7][15] = {"This.ima","This2.ima","This3.ima","This4.ima"};
int IDAudio=0;

static void Player()
{
 Streamer stream;
 stream.begin(song[IDAudio]);
 byte playing = 1;

 while(1)
 {
  GD.ClearColorRGB(0x100000);
  GD.Clear();
   GD.get_inputs();

   GD.SaveContext();
    GD.cmd_text(GD.w/2, 20, 29, OPT_CENTER, song[IDAudio]);
    GD.Tag(100); GD.cmd_fgcolor(0x005000);  GD.cmd_button((GD.w/2)-(100/2), (GD.h/2)+(60/2), 100, 60, 28, 0,"Next");  GD.Tag(255);
    GD.Tag(101); GD.cmd_fgcolor(0x000050);  GD.cmd_button(5, (GD.h/2)+(60/2), 100, 60, 28, 0,"MP");  GD.Tag(255);
   GD.RestoreContext();

  uint16_t val, range;
  stream.progress(val, range);

  GD.SaveContext();
   GD.ColorRGB(0x00ff00); GD.cmd_fgcolor(0x000000); GD.cmd_bgcolor(0xff0000); GD.cmd_slider(GD.w/4, 60, GD.w/2, 8, 0, val, range);
  GD.RestoreContext();

  GD.cmd_number(GD.w/2, GD.h/3, 27, OPT_CENTERX|OPT_RIGHTX|OPT_SIGNED, val);
  GD.cmd_number(GD.w/2, GD.h/2, 27, OPT_CENTERX|OPT_RIGHTX|OPT_SIGNED, range);

  if(val>=range)
    {
     IDAudio =IDAudio +1;
      if(IDAudio>=4){IDAudio=0;}
     Player();
    }

  if (GD.inputs.tag == 100)
    {
      delay(170);
      IDAudio =IDAudio +1;
      if(IDAudio>=4){IDAudio=0;}
      Player();
     }

  if (GD.inputs.tag == 101)
     {
       MP();
     }
 GD.swap();
     
   if (!stream.feed())
   {
     playing = 0;
     GD.sample(0, 0, 0, 0);
   }
 }
}

void setup()
{
 GD.begin();
 MP();
}

void loop(){}

void MP()
{
 GD.sample(0, 0, 0, 0);
 while(1)

 {
  GD.ClearColorRGB(0x001050);
  GD.Clear();
   GD.get_inputs();

   GD.SaveContext();
    GD.Tag(102); GD.cmd_fgcolor(0x500000);  GD.cmd_button((GD.w/2), (GD.h/2)-(60/2), 140, 60, 28, 0,"IMA Player");  GD.Tag(255);
   GD.RestoreContext();

   if (GD.inputs.tag == 102)
     {
       Player();
     }
    GD.swap();
 }
}

 

TFT: BT817, 5"
MCU: Teensy 4.1
Ima files:

www.mediafire.com/file/pfhft3j2oymwqgt/IMA_audio.zip/file