The process of playing pno-cs.mp3 is all noise

[murarduino]

I use the sketch of PlayMP3FromSPIFFS in the examples to play MP3 music. pno_cs.mp3 also makes the music file for this instance.

Use ESP32-PICO-KIT and Max98357 to build the hardware environment for testing, and VScode+platfromIO to configure the ESP development environment under the Arduino architecture.

`#include

include

include "SPIFFS.h"

include "AudioFileSourceSPIFFS.h"

include "AudioFileSourceID3.h"

include "AudioGeneratorMP3.h"

include "AudioOutputI2SNoDAC.h"

// To run, set your ESP8266 build to 160MHz, and include a SPIFFS of 512KB or greater. // Use the "Tools->ESP8266/ESP32 Sketch Data Upload" menu to write the MP3 to SPIFFS // Then upload the sketch normally.

// pno_cs from https://ccrma.stanford.edu/~jos/pasp/Sound_Examples.html

AudioGeneratorMP3 mp3; AudioFileSourceSPIFFS file; AudioOutputI2SNoDAC out; AudioFileSourceID3 id3;

// Called when a metadata event occurs (i.e. an ID3 tag, an ICY block, etc. void MDCallback(void cbData, const char type, bool isUnicode, const char *string) { (void)cbData; Serial.printf("ID3 callback for: %s = '", type);

if (isUnicode) { string += 2; }

while (string) { char a = (string++); if (isUnicode) { string++; } Serial.printf("%c", a); } Serial.printf("'\n"); Serial.flush(); }

void setup() { WiFi.mode(WIFI_OFF); Serial.begin(115200); delay(1000); SPIFFS.begin(); Serial.printf("Sample MP3 playback begins...\n");

audioLogger = &Serial; file = new AudioFileSourceSPIFFS("/pno-cs.mp3"); id3 = new AudioFileSourceID3(file); id3->RegisterMetadataCB(MDCallback, (void*)"ID3TAG"); out = new AudioOutputI2SNoDAC(); mp3 = new AudioGeneratorMP3(); mp3->begin(id3, out); }

void loop() { if (mp3->isRunning()) { if (!mp3->loop()) mp3->stop(); } else { Serial.printf("MP3 done\n"); delay(1000); } } `

During testing I found some issues but not sure:

1. The frequency of pno_cs.mp3 is 48KHz, and the frequency set by the code is 44.1KHz
2. I use a 1W8R small speaker. Tested with both 3.3V and 5V power supply, (including Gain to +15dB and default 9dB), the speakers only made noise during several tests, and could not hear any melody.

[murarduino]

monitor print: `> Executing task in folder ESP32mp3_demo: C:\Users\cecgw.platformio\penv\Scripts\platformio.exe device monitor <

--- Available filters and text transformations: colorize, debug, default, direct, esp32_exception_decoder, hexlify, log2file, nocontrol, printable, send_on_enter, time --- More details at https://bit.ly/pio-monitor-filters --- Miniterm on COM3 115200,8,N,1 --- --- Quit: Ctrl+C | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H --- ets Jun 8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) configsip: 188777542, SPIWP:0xee clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 mode:DIO, clock div:2 load:0x3fff0030,len:1284 load:0x40078000,len:12808 load:0x40080400,len:3032 entry 0x400805e4 Sample MP3 playback begins... +0 0x3ffb2740 ID3 callback for: Title = 'Piano Sample' ID3 callback for: Performer = 'Artist Goes Here' ID3 callback for: Album = 'Album Goes Here' ID3 callback for: Year = '2010' ID3 callback for: eof = 'id3' MP3:ERROR_BUFLEN 0`

[earlephilhower]

That example is NoDAC and does not use an I2S DAC like the Max98357. You need to modify AudioOutputI2SNoDAC to AudioOutputI2S.

[murarduino]

Hi Earle:

    Thanks for the pointers, my MP3 player can at least hear the melody.

include <Arduino.h>

include <WiFi.h>

include "SPIFFS.h"

include "AudioFileSourceSPIFFS.h"

include "AudioFileSourceID3.h"

include "AudioGeneratorMP3.h"

include "AudioOutputI2SNoDAC.h"

// To run, set your ESP8266 build to 160MHz, and include a SPIFFS of 512KB or greater. // Use the "Tools->ESP8266/ESP32 Sketch Data Upload" menu to write the MP3 to SPIFFS // Then upload the sketch normally.  

// pno_cs from https://ccrma.stanford.edu/~jos/pasp/Sound_Examples.html

AudioGeneratorMP3 mp3; AudioFileSourceSPIFFS file; AudioOutputI2S out; AudioFileSourceID3 id3;

// Called when a metadata event occurs (i.e. an ID3 tag, an ICY block, etc. void MDCallback(void cbData, const char type, bool isUnicode, const char *string) {   (void)cbData;   Serial.printf("ID3 callback for: %s = '", type);

  if (isUnicode) {     string += 2;   }     while (string) {     char a = (string++);     if (isUnicode) {       string++;     }     Serial.printf("%c", a);   }   Serial.printf("'\n");   Serial.flush(); }

void setup() {   WiFi.mode(WIFI_OFF);   Serial.begin(115200);   delay(1000);   SPIFFS.begin();   Serial.printf("Sample MP3 playback begins...\n");

  audioLogger = &Serial;   file = new AudioFileSourceSPIFFS("/pno-cs.mp3");   id3 = new AudioFileSourceID3(file);   id3->RegisterMetadataCB(MDCallback, (void*)"ID3TAG");   out = new AudioOutputI2S();   out->SetPinout(26,25,22);   mp3 = new AudioGeneratorMP3();   mp3->begin(id3, out);

}

void loop() {   if (mp3->isRunning()) {     if (!mp3->loop()) mp3->stop();   } else {     Serial.printf("MP3 done\n");     delay(1000);   } }

    However, when MP3 is playing, there are still many broken sounds, which affect the quality of music. I have configured the CPU to work at 240HMz. Do I still need to adjust the Count and len values of dma_buf?

------------------ 原始邮件 ------------------ 发件人: "earlephilhower/ESP8266Audio" @.>; 发送时间: 2022年6月7日(星期二) 晚上10:11 @.>; @.**@.>; 主题: Re: [earlephilhower/ESP8266Audio] The process of playing pno-cs.mp3 is all noise (Issue #538)

That example is NoDAC and does not use an I2S DAC like the Max98357. You need to modify AudioOutputI2SNoDAC to AudioOutputI2S.

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