commit ded9fbc50e5997c91298e48d11ef3d6eb3e5507e
author Sam Lantinga <slouken@libsdl.org> Fri Oct 07 19:08:22 2016 -0700
committer Sam Lantinga <slouken@libsdl.org> Fri Oct 07 19:08:22 2016 -0700
tree 0c5f90700f8d063c06d9402aaea57c32442062e5
parent b8af45ce245f54f7350cc87113751c02329f35f1

ALSA_snd_pcm_drop() can hang on some systems (Steam Link) so don't use that when shutting down the ALSA audio driver.

src/audio/alsa/SDL_alsa_audio.c

diff --git a/src/audio/alsa/SDL_alsa_audio.c b/src/audio/alsa/SDL_alsa_audio.c
index 2373956..8394797 100644
--- a/src/audio/alsa/SDL_alsa_audio.c
+++ b/src/audio/alsa/SDL_alsa_audio.c
@@ -49,7 +49,6 @@
 static int (*ALSA_snd_pcm_recover) (snd_pcm_t *, int, int);
 static int (*ALSA_snd_pcm_prepare) (snd_pcm_t *);
 static int (*ALSA_snd_pcm_drain) (snd_pcm_t *);
-static int (*ALSA_snd_pcm_drop) (snd_pcm_t *);
 static const char *(*ALSA_snd_strerror) (int);
 static size_t(*ALSA_snd_pcm_hw_params_sizeof) (void);
 static size_t(*ALSA_snd_pcm_sw_params_sizeof) (void);
@@ -129,7 +128,6 @@
     SDL_ALSA_SYM(snd_pcm_recover);
     SDL_ALSA_SYM(snd_pcm_prepare);
     SDL_ALSA_SYM(snd_pcm_drain);
-    SDL_ALSA_SYM(snd_pcm_drop);
     SDL_ALSA_SYM(snd_strerror);
     SDL_ALSA_SYM(snd_pcm_hw_params_sizeof);
     SDL_ALSA_SYM(snd_pcm_sw_params_sizeof);
@@ -404,7 +402,12 @@
 ALSA_CloseDevice(_THIS)
 {
     if (this->hidden->pcm_handle) {
-        ALSA_snd_pcm_drop(this->hidden->pcm_handle);
+	/* Wait for the submitted audio to drain
+           ALSA_snd_pcm_drop() can hang, so don't use that.
+         */
+        Uint32 delay = ((this->spec.samples * 1000) / this->spec.freq) * 2;
+        SDL_Delay(delay);
+
         ALSA_snd_pcm_close(this->hidden->pcm_handle);
     }
     SDL_free(this->hidden->mixbuf);