Playing a ~1 min audio clip to bluetooth speaker?

[lanewinfield]

Hi there,

I've been playing around with ESP32-A2DP and this library and getting a bit stumped on what I think is a fairly simple task: playing a ~1min long audio clip (preferably up to ~3min) on whatever Bluetooth speaker my ESP32 v2 (from Adafruit, with 8MB flash) connects to first.

I got the connection working and playing fine, but I can only fit about 10 seconds or so of this audio on the device—in raw format in C, the filesize obviously becomes absolutely gigantic.

Any suggestions on how I could potentially fit a whole minute (or more) on this? I'd love to avoid having to solder an SD card reader onto my device.

Thanks so much!

B

[pschatzmann]

Did you try to use mp3 ? Mp3 uses much less memory then wav or PCM audio data...
But the storage media of choice for large data is really SD.

[lanewinfield]

I'm trying to combine a couple of your very helpful example scripts together to make a finished product. I'm using your sample mp3 you have in the /data folder of these examples.

/**
 * @file player-spiffs-i2s.ino
 * @brief example using the SPIFFS library
 * 
 * @author Phil Schatzmann
 * @copyright GPLv3
 */

#include "AudioTools.h"
#include "AudioLibs/AudioA2DP.h"
#include "AudioLibs/AudioSourceSPIFFS.h"
#include "AudioCodecs/CodecMP3Helix.h"

const char *startFilePath="/";
const char* ext="mp3";
AudioSourceSPIFFS source(startFilePath, ext);
A2DPStream out;
MP3DecoderHelix decoder;
AudioPlayer player(source, out, decoder);

void printMetaData(MetaDataType type, const char* str, int len){
  Serial.print("==> ");
  Serial.print(toStr(type));
  Serial.print(": ");
  Serial.println(str);
}

void setup() {
  Serial.begin(115200);
  AudioLogger::instance().begin(Serial, AudioLogger::Info);

  SPIFFS.begin(true);

  // setup output - We send the test signal via A2DP - so we conect to the "LEXON MINO L" Bluetooth Speaker
  auto cfg = out.defaultConfig(TX_MODE);
  cfg.name = "Sonos";
//  cfg.auto_reconnect = true;  // if this is use we just quickly connect to the last device ignoring cfg.name
  out.begin(cfg);

  // setup player
  player.setVolume(1);
  player.begin();
}

void loop() {
  player.copy();
}

This connects successfully, but I seem to get this error when it attempts to play:

[W] AudioPlayer.h : 144 - -> begin: no data found

Any thoughts?

[pschatzmann]

Your file system does not contain any files which end with .mp3
That's the reason why I prefer to use MemoryStream: I can be dead sure that the data is there.
You can use this with mp3 as well...

[lanewinfield]

The .mp3 file is in the /data folder. (see: https://i.imgur.com/AvoZxqH.png)

Strangely now, it doesn't say anything. No "no data found" but nothing is playing. It just says:

[W] AudioA2DP.h : 300 - ==> state: Connecting
[W] AudioA2DP.h : 300 - ==> state: Connected

And nothing plays.

[lanewinfield]

Ok, i'm getting somewhere. Realized I had to upload the file separately. Now here's what I'm getting:

[I] AudioA2DP.h : 152 - a2dp_source is connected...
[I] AudioPlayer.h : 279 - setVolume(1.000000)
[I] AudioStreams.h : 1106 - setVolume: 1.000000
[I] AudioStreams.h : 1106 - setVolume: 1.000000
[I] MetaDataID3.h : 544 - virtual void audio_tools::MetaDataID3::begin()
[I] AudioSourceSPIFFS.h : 45 - selectStream: 0
[I] AudioSourceSPIFFS.h : 49 - Using file /file_example_MP3_700KB.mp3
[I] AudioCopy.h : 69 - buffer_size=1024
[I] AudioPlayer.h : 279 - setVolume(0.800000)
[I] AudioStreams.h : 1106 - setVolume: 0.800000
[I] AudioStreams.h : 1106 - setVolume: 0.800000
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioPlayer.h : 193 - sample_rate: 32000
[I] AudioPlayer.h : 194 - bits_per_sample: 16
[I] AudioPlayer.h : 195 - channels: 2
[I] AudioStreams.h : 1106 - setVolume: 0.800000
[I] AudioStreams.h : 1106 - setVolume: 0.800000
[I] AudioTypes.h : 54 - sample_rate: 32000
[I] AudioTypes.h : 55 - channels: 2
[I] AudioTypes.h : 56 - bits_per_sample: 16
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops

And then afterwards, this error repeats a ton:

[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[W] AudioA2DP.h : 209 - is_a2dp_active -> true with 59904 bytes

Then finally ends here:

[I] AudioCopy.h : 134 - StreamCopy::copy 1024 -> 1024 -> 1024 bytes - in 1 hops
[I] AudioCopy.h : 134 - StreamCopy::copy 272 -> 272 -> 272 bytes - in 1 hops
[W] AudioPlayer.h : 316 - -> timeout - moving to next stream
[I] AudioSourceSPIFFS.h : 40 - nextStream: 1
[I] AudioSourceSPIFFS.h : 45 - selectStream: 1
[I] AudioEncoded.h : 324 - void audio_tools::EncodedAudioStream::end()
[I] MetaDataID3.h : 550 - virtual void audio_tools::MetaDataID3::end()

And all the while, no audio plays.

[lanewinfield]

Ok, latest update:

About 1 in every 10 or so attempts, I do hear some audio now. It's super fast, cuts in and out and has strange artifacting like clicks and pops.

Progress though!

[lanewinfield]

Ok, got it working. For some reason, any mp3 exported from Audacity would play back at ~2x speed, but once I used an online converter, somehow that worked fine.

All's well. Thanks for your help @pschatzmann.

But now I have a new question! Any way to loop the track so it continuously plays? :)