fix(audio): discard capture data without playback

Continue draining the capture FIFO but skip channel conversion and writes when playback is unavailable or intentionally stopped. This keeps capture running safely in microphone-only phases.

Signed-off-by: HiFiPHile <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/examples/host/audio_host/src/audio_app.c b/examples/host/audio_host/src/audio_app.c
index 0c4ed8a23..3102c28c9 100644
--- a/examples/host/audio_host/src/audio_app.c
+++ b/examples/host/audio_host/src/audio_app.c
@@ -287,6 +287,9 @@ void audio_app_task_read(void) {
   if (frames == 0) {
     return;
   }
+  if (!spk_ready) {
+    return; // capture-only device or playback intentionally stopped
+  }
 
   if (spk_config.channels == mic_config.channels) {
     memcpy(spk_samples, mic_samples, frames * mic_config.channels * sizeof(int16_t));