AAC one channel - mono playback problem on I2S

[Sanc0Pansa]

Hello. I'm having trouble playing the AAC stream http://str.pcradio.ru/Abba-hi The same stream in the example schreibfaul1 / ESP32-audioI2S library works correctly. (https://github.com/schreibfaul1/ESP32-audioI2S/blob/master/examples/I2Saudio/I2Saudio.ino) I use I2S PCM5102.

[Sanc0Pansa]

Serial output schreibfaul1 demo play correctly :

info PSRAM not found, inputBufferSize: 6399 bytes info buffers freed, free Heap: 225568 bytes info Connect to new host: "http://str.pcradio.ru/Abba-hi" info Connect to "str.pcradio.ru" on port 80, extension "/Abba-hi" info Connection has been established in 57 ms, free Heap: 222736 bytes info HTTP/1.1 200 OK info server: nginx info date: Tue, 17 May 2022 17:13:18 GMT info content-type: audio/aac, format is aac info AACDecoder has been initialized, free Heap: 202700 bytes bitrate 64000 info ice-audio-info: channels=2;samplerate=44100;bitrate=64 bitrate 64000 info icy-name: Abba station Abba icyurl http://www.pcradio.ru/ info access-control-allow-origin: * info access-control-allow-headers: Origin, Accept, X-Requested-With, Content-Type info access-control-allow-methods: GET, OPTIONS, HEAD info Switch to DATA, metaint is 16000 lasthost http://str.pcradio.ru/Abba-hi info stream ready info buffer filled in 3 ms info syncword found at pos 0 info Channels: 1 info SampleRate: 22050 info BitsPerSample: 16 info BitRate: 64771 info AAC HeaderFormat: ADTS info AAC Codec: MPEG-4 info AAC Profile: LowComplexity info VBR recognized, audioFileDuration is estimated info StreamTitle='' streamtitle info StreamTitle='ABBA - People Need Love' streamtitle ABBA - People Need Love info StreamTitle='ABBA - Hasta Mañana' streamtitle ABBA - Hasta Mañana

[tsctrl]

hi @Sanc0Pansa you could try to comment out this line to see if it is working https://github.com/Edzelf/ESP32Radio-V2/blob/7d2a1ebc7a3b6f01bf8e3858b592929e202c398b/src/main.cpp#L1419

[Sanc0Pansa]

Thanks for the reply, I'll try tomorrow. But I really don't believe it will help. But that stream plays ridiculously fast and with outages. The problem will be in decoding AAC VBR 64. Interestingly, the I2S decoding library from which edzelf is based plays this correctly.

[Sanc0Pansa]

hi @Sanc0Pansa you could try to comment out this line to see if it is working

https://github.com/Edzelf/ESP32Radio-V2/blob/7d2a1ebc7a3b6f01bf8e3858b592929e202c398b/src/main.cpp#L1419

I tried it, it didn't work. Nothing could be played at all. I give an example of how the AAC VBR stream plays.

https://user-images.githubusercontent.com/105736517/170811196-abd0f188-7ac2-4a23-9226-fc4511771b93.mp4

[Sanc0Pansa]

If someone wants to test this on a search page, there are many stations where this problem occurs. For example, on the card of the 70's, the station 101.3 WKRD - Rockford's Best Mix (ninth in a row). I will add once again that this happens when playing via HELIX I2S (specifically for me PCM 5102). The VS1053 on the ESP32-Radio V1 works. I have not tested the combination of ESP32-Radio V2 with VS1053.

[Sanc0Pansa]

I did some tests and found out what was causing the problem. All AAC streams that contain only 1 channel - mono have this problem. Ed try to look at it.

[Edzelf]

Please give an example of a station with this problem.

[Sanc0Pansa]

Please give an example of a station with this problem.

for example:

fr.radio-streamhosting.com:8000/metalheartradio64aac ice24.securenetsystems.net/WRKD ice6.securenetsystems.net/KCLC2 ice66.securenetsystems.net/R42N stream.open.fm/108

D: Playtask start song D: helixInit called for audio/aac D: Sync found at 0x0051 D: Bitrate is 56847 D: Samprate is 22050

D: Channels is 1

D: Bitpersamp is 16 D: Outputsamps is 1024 D: Streamtitle found, 44 bytes D: StreamTitle='Motley Crue - Time For Change';

[Edzelf]

Mono stations are handled correctly now.