remove pcm_prepare in pcm_open

For the dynamic pcm device, it is valid to specify the backend after
opening it. However, it is invalid to call prepare on a dynamic pcm
device without connecting any backend device. We should not do
pcm_prepare in pcm_open.

See also: Issue #197

2 files changed, 2 insertions, 0 deletions

diff --git a/utils/tinycap.c b/utils/tinycap.c
index 7d4b8a4..e3aa9df 100644
--- a/utils/tinycap.c
+++ b/utils/tinycap.c
@@ -231,6 +231,7 @@ unsigned int capture_sample(FILE *file, unsigned int card, unsigned int device,
                 pcm_get_error(pcm));
         return 0;
     }
+    pcm_prepare(pcm);
 
     size = pcm_frames_to_bytes(pcm, pcm_get_buffer_size(pcm));
     buffer = malloc(size);
diff --git a/utils/tinyplay.c b/utils/tinyplay.c
index 2689158..482ad24 100644
--- a/utils/tinyplay.c
+++ b/utils/tinyplay.c
@@ -192,6 +192,7 @@ int ctx_init(struct ctx* ctx, const struct cmd *cmd)
         pcm_close(ctx->pcm);
         return -1;
     }
+    pcm_prepare(ctx->pcm);
 
     return 0;
 }