Audio File Problem

Other Hardware Audio
1

I have a problem using the right file, the VS1053B chip describs that it can play mp3 files

Decodes formats
Ogg Vorbis
MP3 = MPEG 1 & 2 audio layer III (CBR+VBR+ABR)
MP1 & MP2 = MPEG 1 & 2 audio layers I & II optional
MPEG4 / 2 AAC-LC(+PNS), HE-AAC v2 (Level 3) (SBR + PS)
WMA4.0/4.1/7/8/9 all profiles (5-384 kbps)
FLAC lossless audio with software plugin (upto 24 bits, 48 kHz)
WAV (PCM + IMA ADPCM)
General MIDI 1 / SP-MIDI format 0

I tried mp3, mp2, wav, non of them work correctly + I need to down my bit rate, but doing that
it kills the audio quality, any info on what's the best file format/specs for audio file, cause till now
I get only problems, non of the files are good quality.

I use Audacity to create my audio files.

Code:

#include <SPI.h>
#include <SdFat.h>
#include <SdFatUtil.h>
#include <SFEMP3Shield.h>

#if defined(USE_MP3_REFILL_MEANS) && USE_MP3_REFILL_MEANS == USE_MP3_Timer1
  #include <TimerOne.h>
#elif defined(USE_MP3_REFILL_MEANS) && USE_MP3_REFILL_MEANS == USE_MP3_SimpleTimer
  #include <SimpleTimer.h>
#endif

SdFat sd;
SFEMP3Shield MP3player;
int16_t last_ms_char; // milliseconds of last recieved character from Serial port.
int8_t buffer_pos; // next position to recieve character from Serial port.
char buffer[6]; // 0-35K+null
int x;
void setup() {
  x = 0;
  uint8_t result; 

  Serial.begin(115200);

  //Initialize the SdCard.
  if(!sd.begin(SD_SEL, SPI_FULL_SPEED)) sd.initErrorHalt();
  // depending upon your SdCard environment, SPI_HAVE_SPEED may work better.
  if(!sd.chdir("/")) sd.errorHalt("sd.chdir");
 
result = MP3player.begin();
x=1;

/*
MP3player.playTrack(1);
delay(150);
MP3player.stopTrack();

MP3player.playTrack(2);
delay(150);
MP3player.stopTrack();

MP3player.playTrack(3);
delay(150);
MP3player.stopTrack();

MP3player.playTrack(11);
delay(2000);
MP3player.stopTrack();
*/
}

void loop() {
  
  if(!MP3player.isPlaying()) {
    MP3player.playTrack(x); 
   x+=1; 
  }
  //delay(1000);
}
2

The datasheet says: "Note: Layer I / II decoding must be specifically enabled from register SCI_MODE."

3

Hi MarkT,

Thanks for info, but is there a guide how to do that?
I'll be looking as well but if you got any info on how, let me know pls.

Thanks in advance.

Best Regards,
D60

4

So if I'm not mistaken I have just to define:

#define SM_STREAM           0x0040

/**
 * \brief A macro of the SM_EARSPEAKER_HI bit mask of the SCI_MODE register
 *
 * SM_STREAM activates VS1053b's stream mode. In this mode, data should be sent with as
 * even intervals as possible and preferable in blocks of less than 512 bytes, and VS1053b makes
 * every attempt to keep its input buffer half full by changing its playback speed upto 5%. For best
 * quality sound, the average speed error should be within 0.5%, the bitrate should not exceed
 * 160 kbit/s and VBR should not be used. For details, see Application Notes for VS10XX. This
 * mode only works with MP3 and WAV files.
 */

at the beginning of the code and that's it ?

As well make sure to manually set a constant bit rate for all my audio files:

 void setBitRate(uint16_t);

I'll try this, if this doesn't work as well then not sure what else to do.

5

Does the datasheet explain the SCI_MODE register?
Have you read the source of the library?

6

No,
Yes,

The above message is the "code"/comment from the library.

7

These are the mode bits defined in the VS1053B library

#define VS1053_MODE_SM_DIFF 0x0001
#define VS1053_MODE_SM_LAYER12 0x0002
#define VS1053_MODE_SM_RESET 0x0004
#define VS1053_MODE_SM_CANCEL 0x0008
#define VS1053_MODE_SM_EARSPKLO 0x0010
#define VS1053_MODE_SM_TESTS 0x0020
#define VS1053_MODE_SM_STREAM 0x0040
#define VS1053_MODE_SM_SDINEW 0x0800
#define VS1053_MODE_SM_ADPCM 0x1000
#define VS1053_MODE_SM_LINE1 0x4000
#define VS1053_MODE_SM_CLKRANGE 0x8000

So I presume you need to set the LAYER12 bit.