AudioOutput.h : 387 - Available Buffer 0 too small 64: requested: 128 -> increase the buffer size

[Knottis]

Now trying to run my little program that worked perfectly last summer, but after I ran the "Year's" update of the library, I'm put back to the start!..

In this little program, I use OutputMixer to send one signal out to the speaker (something which only works if there is a signal in and not otherwise!..). I have accepted that it is not possible to do this with this library.
The program contains the OutputMixer and AudioRealFFT functions.

But after the update, I get the following error when you start streaming the guitar or spotify sound to the program!..

ERROR:

[W] AudioOutput.h : 387 - Available Buffer 0 too small 64: requested: 128 -> increase the buffer size
[W] AudioOutput.h : 387 - Available Buffer 1 too small 64: requested: 128 -> increase the buffer size

PS: Everything worked perfectly before this year's update!

The main parts of the program selection:

#include <AudioConfig.h>
#include <AudioTools.h>

#include <ESP_I2S.h>
#include <BluetoothA2DPSink.h>

#include <AudioLibs/AudioRealFFT.h> 

const uint8_t I2S_SCK = 32;    
const uint8_t I2S_WS = 33;     
const uint8_t I2S_SDOUT = 22; 
I2SClass OutI2S;

BluetoothA2DPSink a2dp_sink(OutI2S);  

// Apply Effects on an Input Stream
AudioInfo info(44100, 2, 16);                   
SineWaveGenerator<int16_t> sineWave(10000);     
GeneratedSoundStream<int16_t> Sound(sineWave); 

OutputMixer<int16_t> mixer(OutI2S, 2);  // Output mixer with 2 - outputs mixing to AudioKitStream

const int buffer_size = 128;            // <<<=====   Split up the output into small slices 2 * 128 = 256

uint8_t sound_buffer[buffer_size];


// A2DP Sink with output to FFT...
AudioRealFFT FFT_DATA;                 // or any other supported inplementation

#define NUM_LEDS 15                    // Number of (15)-LEDs used for the VU meter. 


auto FFT_Conf = FFT_DATA.defaultConfig();
FFT_Conf.length = 1024;
FFT_Conf.copyFrom(info);

a2dp_sink.set_raw_stream_reader(Write_Data_Stream);  // Register callback FFT
a2dp_sink.set_stream_reader(Read_Data_Stream, false);  


mixer.begin(buffer_size);              // setup Output mixer with min necessary memory

[pschatzmann]

Did you try to increase the buffer size ?
You try to write 128 bytes into a buffer with a max size of 128 that already contains 64 bytes

[Knottis]

No matter what you set, you get this error!..

const int buffer_size = 4096;

[W] AudioOutput.h : 387 - Available Buffer 1 too small 2048: requested: 4096 -> increase the buffer size

[pschatzmann]

I could reproduce your issue: A correction has been committed.

[Knottis]

Have now update the library!.

The error message disappeared and I have set the value back to 128. But no sound gets through!..

[pschatzmann]

I tested with this sketch and I also reduced the copy size to 128 and mixer buffer size with mixer.begin(128); This was working w/o any issues.

If I remember right the issue was that mixer.begin(n) did allocate a buffer with n samples instead of n bytes . Did you try with mixer.begin(128 * 2) ?

[pschatzmann]

I also committed a correction that would allow an output if one channel is empty: In the test case one copy line commented out and the mixer.flushMixer() uncommented

[Knottis]

No Sound Out!

Have tried some values, but do not get sound through when using OutputMixer!...
128; // 256: //512; //1024; //2048; //4096;

const int buffer_size = 1024;

---

Or is the OutputMixer functionality deleted from the library and this is no longer supported in the new library version?.

[pschatzmann]

Can you provide a simple example that demonstrates the issue ?
All my test cases are still working...

[Knottis]

You can only try your own code!..
Insert that you will use I2S output. Then you see that the Arduino goes into panic mode!..

You cannot use your MacBook development machine for this. Install VritualBox with a clean machine with only Arduino installed and your library. Then you will quickly see what errors we users/amateurs experience from errors!

You really need to perform a quality check and cleanup of your code!.

https://github.com/pschatzmann/arduino-audio-tools/blob/185272cf19eed05e4e68c6bd32481883ddcbce31/examples/examples-communication/a2dp/basic-a2dp-mixer-i2s/basic-a2dp-mixer-i2s.ino

const uint8_t I2S_SCK = 32;
const uint8_t I2S_WS = 33;
const uint8_t I2S_SDOUT = 22;
I2SClass OutI2S;

BluetoothA2DPSink a2dp_sink(OutI2S);

[pschatzmann]

As I was writing all my test cases including this one are passing when I tested with the Arduino ESP 3.0.1.

The line BluetoothA2DPSink a2dp_sink; in the example is ok because the output is not used and is going via the callback.
The only negative thing I noticed was the when you hit pause in Bluetooth and the output is stopped the new i2s driver does not stop the output. But is a feature of the new IDF functionality.

What Arduino ESP32 core version are you using ?

Don't replace I2SStream with I2SClass!
If you change the example, I expect that you should know what you are doing: Your changes should also give some compile errors!