sample = (int32_t)(((int8_t)buffer[sIndex + 2])<<16 | (buffer[sIndex + 1])<<8 | (buffer[sIndex + 0])); So the byte order actually was little-endian all along ;) Btw, for performance reasons, I would definitely steer clear of using double, and generally would avoid/reduce floating point calculations...

I don't know how and why, but I finally managed to do it. Two months, I tried every witchery and randomly when clearing the bloated lines and the commented definitly not working ones, it works ! I thank both of you guys (MicroController and ESP_Sprite) Here is the working code (for one channel), if ...

Here's how I would probably draft it: static const uint32_t bytes_per_sample = 3; static const uint32_t samples_per_frame = 2; // Read a big-endian, signed 24-bit value from src static int32_t read24(const uint8_t* const src) { int32_t r = (int8_t)src[0]; // takes care of the sign-extension r = (r<...

(Before treatment) sample[Left] = 0X831700 (8591104) That would be a large negative value (-8186112), very close to the maximum amplitude representable in 24bits (-8388608). Double-check the byte order in the buffer. And make sure you operate on the signed values. (int32_t signed32 = ((int32_t)(sam...

Erm... you sure the I2S doesn't require 24 bits of sample data in 32-bits variables? Do you mean using 1 u32bit variable instead of a 3 u8bit ? I already tried that as well In the datasheet of the UDA1334 (page 10 https://www.nxp.com/docs/en/data-sheet/UDA1334ATS.pdf#page=10 ), in 24 bit mode, the ...

Plus, the samples are signed , two's complement values; so you have to sign-extend them to int32_t before multiplying. I also tried converting the values into signed int32_t, either by bit shifting or by map() (to get a more accurate conversion, I guess). Nothing works. I don't know why, because wh...

I tried to set manually the sample into little endian and in big endian, still noise. // @return Returns the first 24 bits #define as24bit(n) (uint32_t)(n&0xFFFFFF) #define CONVERT32bits(b,o) (uint32_t)(b[o]<<16 | b[o+1]<<8 | b[o+2]) /* @param n The number to convert @param o Byte offset (0:Right, 1...

Both I2S port are configured as little endian (or big endian to false) through this parameter Do you think this is the source of the problem ? https://docs.espressif.com/projects/esp-idf/en/v5.1.1/esp32s3/api-reference/peripherals/i2s.html#_CPPv4N21i2s_std_slot_config_t10big_endianE (extract from th...

I'm trying to do a I2S microphone + headphone example program with basic audio manipulation (eg: gain, delay, etc...) I have successfully done the simple part that gets the data from the microphone (using the INMP441, 24bits @ 48kHz), and sends it to the headphones (using the UDA1334, 24bits @ 48kHz...