X-Git-Url: http://git.tuebingen.mpg.de/?a=blobdiff_plain;f=mp.c;h=b5fa9cacaa6dcf9f3e2ef6f99fd025757f12097c;hb=2bad70d84e763b4d866d7b97dbc1cdc8e030bd45;hp=3f6cfbe6cd297ad2bc34490a77784679f434754f;hpb=23af03dbfb283045ff952267ee83c2b7f2ef6380;p=paraslash.git

diff --git a/mp.c b/mp.c
index 3f6cfbe6..b5fa9cac 100644
--- a/mp.c
+++ b/mp.c
@@ -9,7 +9,7 @@
  * The public API (at the bottom of the file) allows parsing the same mood
  * definition many times in an efficient manner.
  *
- * The first function to all is \ref mp_init(), which analyzes the given mood
+ * The first function to call is \ref mp_init(), which analyzes the given mood
  * definition syntactically. It returns the abstract syntax tree of the mood
  * definition and pre-compiles all regular expression patterns to make later
  * pattern matching efficient.
@@ -389,6 +389,27 @@ MP_AFHI(frequency)
 MP_AFHI(channels)
 /** \endcond */
 
+/**
+ * Return the duration of the audio file from the afh info structure.
+ *
+ * \param ctx See \ref mp_path().
+ *
+ * The duration is computed by multiplying the number of chunks and the
+ * duration of one chunk.
+ *
+ * \return The approximate number of milliseconds.
+ */
+int64_t mp_duration(struct mp_context *ctx)
+{
+	struct timeval tmp;
+	int ret = get_afhi(ctx);
+
+	if (ret < 0)
+		return 0;
+	tv_scale(ctx->afhi.chunks_total, &ctx->afhi.chunk_tv, &tmp);
+	return tv2ms(&tmp);
+}
+
 /**
  * Define a function which extracts and returns the value of a meta tag.
  *
@@ -491,10 +512,10 @@ int mp_init(const char *definition, int nbytes, struct mp_context **result,
 	struct mp_context *ctx;
 	struct yy_buffer_state *buffer_state;
 
+	*result = NULL;
 	if (!definition || nbytes == 0) { /* dummy mood */
 		if (errmsg)
 			*errmsg = NULL;
-		*result = NULL;
 		return 0;
 	}
 	ctx = para_calloc(sizeof(*ctx));
@@ -541,6 +562,8 @@ bool mp_eval_row(const struct osl_row *aft_row, struct mp_context *ctx)
 {
 	if (!ctx) /* dummy mood */
 		return true;
+	if (!ctx->ast) /* empty mood */
+		return true;
 	assert(aft_row);
 	ctx->aft_row = aft_row;
 	ctx->have_afsi = false;