When some WAV and MP3 files finish playing, the amplifier continues with clicking noises

[cmcooper1971]

Hi All,

I have designed my own audio board, using an ESP32 WROOM and SD-CARD reader. The output is connected to a Texas Instruments TAS5760L I2S Class D Amplifier IC. Using Phils excellent Audio Tools library, I can play MP3 and WAV files, plus I have a separate I2S digital microphone input, which also works successfully. Please see my PCB assembled below.

During my prototyping, everything was floorless after much work, but since building the finished PCB, a strange problem occurs and I cannot seem to diagnose the fault.

Libraries as follows:

#include "AudioTools.h"
#include "AudioLibs/AudioSourceSD.h"
#include "AudioCodecs/CodecWAV.h"
#include "AudioCodecs/CodecMP3Helix.h"

Audio objects and parameters as follows:

// Audio object

AudioInfo info(44100, 2, 16);

// Audio streams in and out

I2SStream in;

I2SStream out;

ConverterFillLeftAndRight<int16_t> left_and_right(RightIsEmpty);

ConverterStream<int16_t> converter(in, left_and_right);

AudioEffectStream effects(out);

EncodedAudioStream decoder(&out, new WAVDecoder()); // Decoding stream
//EncodedAudioStream decoder(&out, new MP3DecoderHelix()); // Decoding stream

StreamCopy mp3;
StreamCopy mic(effects, converter);

Using Interupts, I enable either the MP3 / WAV player or Microphone, below is the Player function:

// Enable Player & disable MIC

void enablePlayer() {

	mic.end();
	in.end();
	out.end();

	// Start I2S out

	AudioLogger::instance().begin(Serial, AudioLogger::Warning);

	auto config_out = out.defaultConfig(TX_MODE);
	config_out.copyFrom(info);
	config_out.i2s_format = I2S_STD_FORMAT;
	config_out.is_master = true;
	config_out.port_no = 1;
	config_out.pin_bck = I2S_BCLK_1;
	config_out.pin_ws = I2S_LRC_1;
	config_out.pin_data = I2S_DOUT_1;
	config_out.pin_mck = I2S_MCLK_1;
	out.begin(config_out);

	// Start player

	decoder.begin();
	mp3.begin(decoder, audioFile);

	debugln("Player Enabled");
	digitalWrite(amberLED, true);

	playerControlFlagChanged = false;

	displayVolumeRegister();
	displayFaultRegister();

}	// Close function

In the loop, I detect when the file has finished playing, and this all works correctly, as follows:

	if (playerControlFlag == true && micControlFlag == false) {

		//mp3.copy();

		size_t copied = mp3.copy();

		if (copied == 0  && playAudioFile == true) {

			// No more data to copy, end of file reached

			Serial.println("End of file reached.");

			// No more data to copy, complete action

			audioFile.close();
			playAudioFile = false;

		}

	}

Now, I can stop the clicking, easily, by using mp3.end() , and decoder.end() calls in the loop to complete the actions.

When I trigger the next track, I simply call mp3.begin() and decoder.begin().

This works OK, but after 10 triggers, the ESP crashes and I receive the following error:

Assert failed: virtual void audio_tools::EncodedAudioOutput::addNotifyAudioChange(audio_tools::AudioInfoSupport&) AudioEncoded.h:78 (count<10)

Interestingly, I can replicate the problem, as it only occurs with certain audio tracks, but using tools such as Audacity, I cannot find any errors with the files themselves and they play on other players OK, including my prototype.

Does anyone have any clues how I can solve this or implement a work around, such as ending and starting the player functions?

[pschatzmann]

Do you have a back trace ? It would be interesting to see why this is called...

ps. I committed a correction which removes this check.

[cmcooper1971]

Hi Phil,

Many thanks for replying.

Back trace as requested:

assert failed: virtual void audio_tools::EncodedAudioOutput::addNotifyAudioChange(audio_tools::AudioInfoSupport&) AudioEncoded.h:78 (count<10)

Backtrace: 0x40082cd9:0x3ffb1ff0 0x4008ef19:0x3ffb2010 0x4009462e:0x3ffb2030 0x400d4b3a:0x3ffb2160 0x400d4b80:0x3ffb2180 0x400d54fd:0x3ffb21a0 0x400d34c2:0x3ffb21c0 0x400d3763:0x3ffb21e0 0x400d3d7a:0x3ffb2220 0x400e267c:0x3ffb2270 0x40091876:0x3ffb2290

ELF file SHA256: b21486293757fbaf

Exception:Error:
/home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp_system/panic.c:466:::0x40082cd9:panic_abort
/home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/esp_system/port/esp_system_chip.c:84:::0x4008ef19:esp_system_abort
/home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/newlib/assert.c:81:::0x4009462e:__assert_func
documents\arduino\libraries\audio-tools\src\AudioCodecs/AudioEncoded.h(78): error 0x400d4b3a:audio_tools
documents\arduino\libraries\audio-tools\src\AudioCodecs/AudioEncoded.h:74:::(inlined by) audio_tools:
documents\arduino\libraries\audio-tools\src\AudioCodecs/AudioEncoded.h(375): error 0x400d4b80:non-virtual thunk to audio_tools
c:\users\chris\onedrive\documents\arduino\libraries\audio-tools\src\audiotools/AudioIO.h(207): error 0x400d54fd:audio_tools
c:\users\chris\onedrive\documents\arduino\libraries\audio-tools\src\audiotools/AudioIO.h:204:::(inlined by) audio_tools:
documents\arduino\libraries\audio-tools\src\AudioCodecs/AudioEncoded.h:366:::(inlined by) audio_tools:
documents\arduino\libraries\audio-tools\src\audiotools/StreamCopy.h(389): error 0x400d34c2:audio_tools
documents\arduino\libraries\audio-tools\src\audiotools/StreamCopy.h(152): error 0x400d3763:audio_tools
documents\arduino\libraries\audio-tools\src\audiotools/StreamCopy.h(93): error 0x400d3d7a:audio_tools
documents\arduino\libraries\audio-tools\src\audiotools/StreamCopy.h:500:::(inlined by) audio_tools:
(inlined by) loop() at \CosBox_v1.01/CosBox_v1.01.ino:705
appdata\local\arduino15\packages\esp32\hardware\esp32\3.0.3\cores\esp32/main.cpp(74): error 0x400e267c:loopTask(void*)
/home/runner/work/esp32-arduino-lib-builder/esp32-arduino-lib-builder/esp-idf/components/freertos/FreeRTOS-Kernel/portable/xtensa/port.c:162:::0x40091876:vPortTaskWrapper

I have also updated my library to the latest you kindly supplied, edited my functions to start and stop the player controls and the problem is all resolved.

Many thanks.