squeezelite-esp32/README.md

MOST IMPORTANT: create the right default config file

• make defconfig Then adapt the config file to your wifi/BT/I2C device (can alos be done on the command line)
• make menuconfig Then
• make -j4
• make flash monitor

Once the application is running, under monitor, add autoexec to launch squeezelite at boot

1/ setup WiFi

nvs_set autoexec1 str -v "join <SSID> <password>"

2/ setup squeezelite command line (optional)

nvs_set autoexec2 str -v "squeezelite -o I2S -b 500:2000 -d all=info -m ESP32"

3/ enable autoexec

nvs_set autoexec u8 -v 1

4/ set bluetooth & airplaysink name (if not set in menuconfig)

nvs_set bt_sink_name str -v "" nvs_set airplay_sink_name str -v ""

The "join" and "squeezelite" commands can also be typed at the prompt to start manually. Use "help" to see the list.

The squeezelite options are very similar to the regular Linux ones. Differences are :

- the output is -o [\"BT -n <sinkname>\"] | [I2S]

- if you've compiled with RESAMPLE option, normal soxr options are available using -R [-u <options>]. Note that anything above LQ or MQ will overload the CPU

- if you've used RESAMPLE16, <options> are (b|l|m)[:i], with b = basic linear interpolation, l = 13 taps, m = 21 taps, i = interpolate filter coefficients

To add options that require quotes ("), escape them with \". For example, so use a BT speaker named MySpeaker and resample everything to 44100 (which is needed with Bluetooth) and use 16 bits resample with medium quality, the command line is:

nvs_set autoexec2 str -v "squeezelite -o \"BT -n 'MySpeaker'\" -b 500:2000 -R -u m -Z 192000 -r \"44100-44100\""

Additional misc notes to do you build

• for all libraries, add -mlongcalls.
• audio libraries are complicated to rebuild, open an issue if you really want to
• libmad, libflac (no esp's version), libvorbis (tremor - not esp's version), alac work
• libfaad does not really support real time, but if you want to try
  • -O3 -DFIXED_POINT -DSMALL_STACK
  • change ac_link in configure and case ac_files, remove ''
  • compiler but in cfft.c and cffti1, must disable optimization using #pragma GCC push_options #pragma GCC optimize ("O0") #pragma GCC pop_options
• opus & opusfile
  • for opus, the ESP-provided library seems to work, but opusfile is still needed
  • per mad & few others, edit configure and change $ac_link to add -c (faking link)
  • change ac_files to remove ''
  • add DEPS_CFLAGS and DEPS_LIBS to avoid pkg-config to be required
• better use helixaac
  
• set IDF_PATH=/home/esp-idf
• set ESPPORT=COM9
• update flash partition size
• other compiler #define
  • use no resampling or set RESAMPLE (soxr) or set RESAMPLE16 for fast fixed 16 bits resampling
  • use LOOPBACK (mandatory)
  • use BYTES_PER_FRAME=4 (8 is not fully functionnal)
  • LINKALL (mandatory)
  • NO_FAAD unless you want to us faad, which currently overloads the CPU
  • TREMOR_ONLY (mandatory)