X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=afh_common.c;h=769674134b0f16d88bbe856d2daf972e54ed4c1b;hp=dd2ae6507e7510da3d1e57c95e03cda51fbf74ca;hb=4990334538fe7f18964a6027b22d47c7640c3ec0;hpb=d5738d17b54186db8c9c7f119a03b58382ae9be4

diff --git a/afh_common.c b/afh_common.c
index dd2ae650..76967413 100644
--- a/afh_common.c
+++ b/afh_common.c
@@ -9,7 +9,6 @@
 #include <sys/mman.h> /* mmap */
 #include <sys/time.h> /* gettimeofday */
 #include <sys/types.h>
-#include <dirent.h>
 #include <regex.h>
 
 #include "para.h"
@@ -160,7 +159,6 @@ int compute_afhi(const char *path, char *data, size_t size, int fd,
 {
 	int ret, i, format;
 
-	afhi->header_offset = 0;
 	afhi->header_len = 0;
 	afhi->techinfo = NULL;
 	afhi->tags.artist = NULL;
@@ -249,21 +247,52 @@ void afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
  * Get the header of an audio file.
  *
  * \param afhi The audio file handler data describing the file.
+ * \param audio_format_id Determines the audio format handler.
  * \param map The data of the audio file.
+ * \param mapsize The amount of bytes of the mmapped 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 treatment.
+ *
+ * Otherwise, it is checked whether the audio format handler given by
+ * \a audio_format_id defines a ->get_header() method. If it does, this
+ * method is called to obtain the header. If ->get_header() is \p NULL,
+ * a reference to the first chunk of the audio file is returned.
+ *
+ * Once the header is no longer needed, the caller must call \ref
+ * afh_free_header() to free the resources allocated by this function.
  */
-void afh_get_header(struct afh_info *afhi, void *map, const char **buf, size_t *len)
+void afh_get_header(struct afh_info *afhi, uint8_t audio_format_id,
+		void *map, size_t mapsize, char **buf, size_t *len)
 {
+	struct audio_format_handler *afh = afl + audio_format_id;
+
 	if (!map || !afhi || !afhi->header_len) {
 		*buf = NULL;
 		*len = 0;
 		return;
 	}
-	*len = afhi->header_len;
-	*buf = map + afhi->header_offset;
+	if (!afh->get_header) {
+		*len = afhi->header_len;
+		*buf = map;
+		return;
+	}
+	afh->get_header(map, mapsize, buf, len);
+}
+
+/**
+ * Deallocate any resources obtained from afh_get_header().
+ *
+ * \param header_buf Pointer obtained via afh_get_header().
+ * \param audio_format_id Determines the audio format handler.
+ */
+void afh_free_header(char *header_buf, uint8_t audio_format_id)
+{
+	struct audio_format_handler *afh = afl + audio_format_id;
+
+	if (afh->get_header)
+		free(header_buf);
 }