Improved audio lib error handling and aborting playback

firmware/libs/audio/Kconfig

@@ -38,7 +38,7 @@ if AUDIO
     config AUDIO_BLOCK_SIZE
         int "Audio Block Size (bytes)"
         default 1024
-        range 256 4096
+        range 256 8192
         help
           Set the size of each audio block in bytes. Larger blocks can reduce CPU overhead but increase latency. Default is 1024 bytes.
 

firmware/libs/audio/src/audio.c

@@ -56,7 +56,6 @@ void audio_thread_fn(void *p1, void *p2, void *p3)
         bool trigger_started = false;
         if (k_msgq_get(&audio_msgq, &file_path, K_FOREVER) == 0)
         {
-
             abort_playback = false;
 
             if (fs_open(&file, file_path, FS_O_READ) < 0)
@@ -72,8 +71,19 @@ void audio_thread_fn(void *p1, void *p2, void *p3)
             while (!abort_playback)
             {
                 void *mem_block;
-                if (k_mem_slab_alloc(&audio_slab, &mem_block, K_MSEC(10)) < 0)
-                    continue;
+                if (k_mem_slab_alloc(&audio_slab, &mem_block, K_MSEC(100)) < 0)
+                {
+                    LOG_ERR("audio: slab timeout (I2S stall? DMA failure?) - skipping sound and resetting I2S...");
+                    i2s_trigger(i2s_dev, I2S_DIR_TX, I2S_TRIGGER_DROP);
+                    audio_init();
+                    break;
+                }
+                if (abort_playback)
+                {
+                    LOG_DBG("thread: playback aborted while waiting for memory block.");
+                    k_mem_slab_free(&audio_slab, mem_block);
+                    break;
+                }
 
                 int16_t *data_ptr = (int16_t *)mem_block;
                 const uint32_t max_mono_samples = CONFIG_AUDIO_BLOCK_SIZE / 4;
@@ -240,5 +250,6 @@ void audio_stop(void)
 {
     abort_playback = true;
     k_msgq_purge(&audio_msgq);
+    i2s_trigger(i2s_dev, I2S_DIR_TX, I2S_TRIGGER_DROP);
     LOG_DBG("Playback stop requested, message queue purged");
 }