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Fix Internal DAC #4

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Fix Internal DAC #4

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0f5635c
add howto generate raw files
ferbar Jun 10, 2020
422430b
fix internal DAC, add checks
ferbar Jun 11, 2020
b3dc1dc
removed pointers
ferbar Jun 11, 2020
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14 changes: 10 additions & 4 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -10,16 +10,22 @@ The class controlling methods run on Core 1. Thus, calls to the class variables
https://github.com/earlephilhower/ESP8266Audio

## The files to be played must be:
* aiff formated,
* raw format,
* stored in the SPIFF,
* filename max 16 char
* PCM signed 8 bit,
* 22050 sample / sec,


You can generate the files with ffmpeg. For example:
````
for i in *.wav ; do ffmpeg -i $i -f s8 -acodec pcm_s8 raw/$i.raw ; done
rename .wav.raw .raw *.wav.raw
````

## Use of the SPIFF:
Currently, the "ESP32 data upload tool" has an error. Your sketch will not have access to the files after the upload. To fix this bug, please load the example sketch "SPIFF_Test" on your ESP32 and reset the ESP32 twice! Then your sketch can easily access the files. Please note that the file name must always be complete with the path name and the file extension!
````
Example: "/testfile.aiff"
Example: "/testfile.raw"
````
## Include the following libraries:

Expand Down Expand Up @@ -131,4 +137,4 @@ channel = channel to be stopped. (0 - 2)
````
channel = channel whose state is to be queried. (0 - 2)
Return: Pitch of the queried channel. (0.0 - 1.0) 0 = normal speed, 1 = double speed
````
````
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