X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=afh_common.c;h=f57ca89fb4b4afc8d7387269d97c0dd1630fddd5;hp=3fa88f14e7015c42b4c2adadaf1977ccc790f774;hb=06372eab260c4d2cba43bfef0d668744aa6c1216;hpb=c0f9ab7c29b7c79b7d46d8546ce0d3a7ec358c97

diff --git a/afh_common.c b/afh_common.c
index 3fa88f14..f57ca89f 100644
--- a/afh_common.c
+++ b/afh_common.c
@@ -143,7 +143,11 @@ int guess_audio_format(const char *name)
 int compute_afhi(const char *path, char *data, size_t size,
 		struct afh_info *afhi)
 {
-	int ret, i, format = guess_audio_format(path);
+	int ret, i, format;
+
+	afhi->header_offset = 0;
+	afhi->header_len = 0;
+	format = guess_audio_format(path);
 
 	if (format >= 0) {
 		ret = afl[format].get_file_info(data, size, afhi);
@@ -176,3 +180,33 @@ const char *audio_format_name(int i)
 	return i >= 0?  afl[i].name : "(none)";
 }
 
+
+void afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
+		void *map, const char **buf, size_t *len)
+{
+	size_t pos = afhi->chunk_table[chunk_num];
+	*buf = map + pos;
+	*len = afhi->chunk_table[chunk_num + 1] - pos;
+}
+
+/**
+ * Get the header of an audio file.
+ *
+ * \param afhi The audio file handler data describing the file.
+ * \param map The data of the audio file.
+ * \param buf The length of the header is stored here.
+ * \param len Points to a buffer containing the header on return.
+ *
+ * This function sets \a buf to \p NULL and \a len to zero if \a map or \a
+ * afhi is \p NULL, or if the current audio format does not need special
+ * header treamtment.
+ */
+void afh_get_header(struct afh_info *afhi, void *map, const char **buf, size_t *len)
+{
+	if (!map || !afhi || ! afhi->header_len) {
+		*buf = NULL;
+		*len = 0;
+	}
+	*len = afhi->header_len;
+	*buf = map + afhi->header_offset;
+}