Ways to implement continuous looping of wav file with no gaps or delays #768
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As the tittle suggests, I am looking for ways to implement continuous looping of a single wav file with no gaps or delays. I am using AudioPlayer.h So if the ending block has data for 300 out of 1024 I want to fill the remainder with the beginning of the file. I would appreciate any suggestions. Timm |
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Replies: 6 comments 8 replies
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a) You would implement a subclass of AudioStream that implements your looping logic using a file as input. |
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Thanks, I will work on that. |
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a) should be pretty easy to implement for WAV files: at the end you would just do a file.seek(44) to position to the beginning of the pcm audio data. |
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With the latest commit I have added a file looper with an example. I suggest that you also read the class documentation and have a look at the example. For the AudioSourceCallback there is already an example that you can use as starting point. |
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Hi @pschatzmann , I was able to successfully run the file looper example. I tried to adapt the AudioSourceCallback example (player-callback-i2s.ino) to use audiokitstream but does not play. Can you tell what I am doing wrong? my code: My Code#include <Arduino.h>
/**
* @file player-sd-callback.ino
* @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-player/player-callback-i2s/README.md
*
* @author Phil Schatzmann
* @copyright GPLv3
*/
// Install https://github.com/pschatzmann/arduino-libhelix.git
#include "Arduino.h"
#include "AudioTools.h"
#include "AudioLibs/AudioKit.h"// Added
#include "AudioLibs/FileLoop.h"// Added
#include "AudioCodecs/CodecWAV.h"// Added
#include <SPI.h>
#include <SD.h>
// forward declarations
void callbackInit();
Stream* callbackStream(int offset);
// data
const int chipSelect=PIN_AUDIO_KIT_SD_CARD_CS; // Changed to audio kit pin
AudioSourceCallback source(callbackStream,callbackInit);
AudioKitStream i2s; // Changed to audio kit
//I2SStream i2s;
WAVDecoder decoder; // Changed to Wav decoder
AudioPlayer player(source, i2s, decoder);
File audioFile;
void callbackInit() {
SD.begin(chipSelect);
audioFile = SD.open("/");
}
Stream* callbackStream(int offset) {
auto lastFile = audioFile;
audioFile = audioFile.openNextFile();
lastFile.close();
return &audioFile;
}
void callbackPrintMetaData(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);
// setup output
auto cfg = i2s.defaultConfig(TX_MODE);
cfg.sd_active = true;
i2s.begin(cfg);
// setup player
player.setMetadataCallback(callbackPrintMetaData);
player.begin();
}
void loop() {
player.copy();
}Serial Monitor Output |
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Check the wiki of the https://github.com/pschatzmann/arduino-audiokit/wiki |
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So I have verified that the board is working fine. Both streams-file_loop-audiokit.ino and player-sd-i2s.ino execute as expected. I still can't get (player-callback-i2s.ino) to play the logger says "AudioPlayer.h : 185 - -> begin: no data found" but I can list the files on the SD card so I know the card is mounting properly. is there anyway to get more details on why the AudioSourceCallback doesn't seem to be doing anything? Thanks |
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So, why don't you just log in the callbackStream what file you are returning? |
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I think I found where the issue is. the AudioPlayer But in the AudioSourceCallback Class in AudioSource.h, it looks like "selectStream(index)" returns nullptr because indexStreamCallback is nullptr |
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The indexStreamCallback is defined by calling setCallbackSelectStream() in the AudioSourceCallback class. The initial AudioSource class was very lean, but it has been getting a bit tricky by merging the different pull requests from different users who wanted to have their use case reflected... |
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Just committed the following logic which makes the selectStream optional: /// Returns selected audio stream
virtual Stream* selectStream(int index) override {
LOGI("selectStream: %d", index);
if (indexStreamCallback==nullptr){
LOGI("setCallbackSelectStream not provided");
if (index>0) begin();
return nextStream(index);
}
return indexStreamCallback(index);
}I also tested and updated the example |
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Just one final comment: I don't quite get why somebody would want to use the Player for an endless looping file. This is somehow a contradiction because the player is just about moving automatically to the next file when the current file ends. If you want to implement a file based looping you are better off using the FileLoop class! |
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Thanks for you help. I tried the new example, using AudioKitStream and WAVDecoder since I have a lyrat board and wave files. The example didn't compile for me, I think the forward declaration of the stream is missing "Next" [I] AudioKit.h : 596 - void audio_tools::AudioKitStream::setupActions() |
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I suggest that you open a new discussion and describe your exact requirements. "is there are multiple file I want to be able to cycle through but only when I select a button to do so". I don't think that the CallbackSource is the right solution for this. It seems you should be looking at setAutoNext() |
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a) You would implement a subclass of AudioStream that implements your looping logic using a file as input.
b) You would implement an AudioSource (e.g. using the AudioSourceCallback) that returns a)