check that device has been started

1 files changed, 10 insertions, 0 deletions

diff --git a/src/pcm.c b/src/pcm.c
index 7b33a1b..56e1cca 100644
--- a/src/pcm.c
+++ b/src/pcm.c
@@ -458,6 +458,11 @@ snd_pcm_writei(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size)
       return 0;
    }
 
+   if (!pcm->started) {
+      WARNX1("playback hasn't been started");
+      return 0;
+   }
+
    const struct io io = { .read = cb_buffer_read, .write = cb_sio_write };
    struct io_state state = { .pcm = pcm, .ptr = buffer, .end = (unsigned char*)buffer + snd_pcm_frames_to_bytes(pcm, size) };
 
@@ -499,6 +504,11 @@ snd_pcm_readi(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size)
       return 0;
    }
 
+   if (!pcm->started) {
+      WARNX1("recording hasn't been started");
+      return 0;
+   }
+
    const struct io io = { .read = cb_sio_read, .write = cb_buffer_write };
    struct io_state state = { .pcm = pcm, .ptr = buffer, .end = (unsigned char*)buffer + snd_pcm_frames_to_bytes(pcm, size) };