[Feature] Support audio_buffer_size #218 (#219)

Author: GioF71

Dockerfile

@@ -208,6 +208,7 @@ ENV ZEROCONF_NAME ""
 ENV HYBRID_DSD_ENABLED ""
 
 ENV MAX_OUTPUT_BUFFER_SIZE ""
+ENV AUDIO_BUFFER_SIZE ""
 
 ENV MAX_ADDITIONAL_OUTPUTS_BY_TYPE ""
 

README.md

@@ -122,6 +122,7 @@ ZEROCONF_ENABLED|Set to `yes` to enable. Disabled by default.
 ZEROCONF_NAME|Set zeroconf name, used only if `ZEROCONF_ENABLED` is set to `yes`
 HYBRID_DSD_ENABLED|Hybrid dsd is enabled by default, set to `no` to disable. Disabled when using Pulse mode.
 MAX_OUTPUT_BUFFER_SIZE|The maximum size of the output buffer to a client (maximum response size). Default is 8192 (8 MiB). Value in KBytes.
+AUDIO_BUFFER_SIZE|Adjust the size of the internal audio buffer. Default is `4 MB` (4 MiB).
 MAX_ADDITIONAL_OUTPUTS_BY_TYPE|The maximum number of outputs by type, defaults to `20`
 RESTORE_PAUSED|If set to `yes`, then MPD is put into pause mode instead of starting playback after startup. Default is `no`.
 STATE_FILE_INTERVAL|Auto-save the state file this number of seconds after each state change, defaults to `10` seconds

app/bin/run-mpd.sh

@@ -668,6 +668,9 @@ fi
 if [ -n "${MAX_OUTPUT_BUFFER_SIZE}" ]; then
     echo "max_output_buffer_size \"${MAX_OUTPUT_BUFFER_SIZE}\"" >> $MPD_ALSA_CONFIG_FILE
 fi
+if [ -n "${AUDIO_BUFFER_SIZE}" ]; then
+    echo "audio_buffer_size \"${AUDIO_BUFFER_SIZE}\"" >> $MPD_ALSA_CONFIG_FILE
+fi
 echo "filesystem_charset \"UTF-8\"" >> $MPD_ALSA_CONFIG_FILE
 
 number_re="^[0-9]+$"

build.sh

@@ -64,7 +64,7 @@ echo "Base Image Tag: ["$selected_image_tag"]"
 echo "Build Tag: ["$tag"]"
 echo "Proxy: ["$proxy"]"
 
-docker build . \
+docker build . --no-cache \
     --build-arg BASE_IMAGE_TAG=${selected_image_tag} \
     --build-arg USE_APT_PROXY=${proxy} \
     -t giof71/mpd-alsa:$tag

doc/change-history.md

@@ -2,6 +2,7 @@
 
 Date|Major Changes
 :---|:---
+2023-01-30|Add support for `AUDIO_BUFFER_SIZE`
 2023-01-20|Player state enforced by default
 2023-01-17|`HTTPD_OUTPUT_TAGS` had typo in name
 2023-01-17|Add `PULSE_AUDIO_OUTPUT_SINK` to PulseAudio output