make VLQ save+restore functions publically accessible, for use with meta-events

git-svn-id: svn://localhost/ardour2/branches/3.0@7952 d708f5d6-7413-0410-9779-e7cbd77b26cf

3 files changed, 15 insertions, 9 deletions

diff --git a/libs/evoral/src/libsmf/smf.h b/libs/evoral/src/libsmf/smf.h
index 5e3e2d1859..7f4aa402c0 100644
--- a/libs/evoral/src/libsmf/smf.h
+++ b/libs/evoral/src/libsmf/smf.h
@@ -386,6 +386,12 @@ int   smf_event_is_textual(const smf_event_t *event) WARN_UNUSED_RESULT;
 char *smf_event_decode(const smf_event_t *event) WARN_UNUSED_RESULT;
 char *smf_event_extract_text(const smf_event_t *event) WARN_UNUSED_RESULT;
 
+/* Routines for dealing with Variable Length Quantities (VLQ's). 
+   Slightly odd names reflect original static names within libsmf
+ */
+int smf_format_vlq (unsigned char *buf, int length, unsigned long value);
+int smf_extract_vlq(const unsigned char *buf, const size_t buffer_length, uint32_t *value, uint32_t *len);
+
 /* Routines for loading SMF files. */
 smf_t *smf_load(FILE *) WARN_UNUSED_RESULT;
 smf_t *smf_load_from_memory(const void *buffer, const size_t buffer_length) WARN_UNUSED_RESULT;
diff --git a/libs/evoral/src/libsmf/smf_load.c b/libs/evoral/src/libsmf/smf_load.c
index cebca73b82..060dc5849e 100644
--- a/libs/evoral/src/libsmf/smf_load.c
+++ b/libs/evoral/src/libsmf/smf_load.c
@@ -206,8 +206,8 @@ parse_mthd_chunk(smf_t *smf)
  * Explanation of Variable Length Quantities is here: http://www.borg.com/~jglatt/tech/midifile/vari.htm
  * Returns 0 iff everything went OK, different value in case of error.
  */
-static int
-extract_vlq(const unsigned char *buf, const size_t buffer_length, uint32_t *value, uint32_t *len)
+int
+smf_extract_vlq(const unsigned char *buf, const size_t buffer_length, uint32_t *value, uint32_t *len)
 {
 	uint32_t val = 0;
 	const unsigned char *c = buf;
@@ -284,7 +284,7 @@ expected_sysex_length(const unsigned char status, const unsigned char *second_by
 		return (-1);
 	}
 
-	extract_vlq(second_byte, buffer_length, &sysex_length, &len);
+	smf_extract_vlq(second_byte, buffer_length, &sysex_length, &len);
 
 	if (consumed_bytes != NULL)
 		*consumed_bytes = len;
@@ -558,7 +558,7 @@ parse_next_event(smf_track_t *track)
 	assert(buffer_length > 0);
 
 	/* First, extract time offset from previous event. */
-	if (extract_vlq(c, buffer_length, &time, &len))
+	if (smf_extract_vlq(c, buffer_length, &time, &len))
 		goto error;
 
 	c += len;
@@ -655,7 +655,7 @@ smf_event_extract_text(const smf_event_t *event)
 		return (NULL);
 	}
 
-	extract_vlq((void *)&(event->midi_buffer[2]), event->midi_buffer_length - 2, &string_length, &length_length);
+	smf_extract_vlq((void *)&(event->midi_buffer[2]), event->midi_buffer_length - 2, &string_length, &length_length);
 
 	if (string_length <= 0) {
 		g_critical("smf_event_extract_text: truncated MIDI message.");
diff --git a/libs/evoral/src/libsmf/smf_save.c b/libs/evoral/src/libsmf/smf_save.c
index b03bf90044..b99af75461 100644
--- a/libs/evoral/src/libsmf/smf_save.c
+++ b/libs/evoral/src/libsmf/smf_save.c
@@ -156,8 +156,8 @@ track_append(smf_track_t *track, const void *buffer, const int buffer_length)
 	return (0);
 }
 
-static int
-format_vlq(unsigned char *buf, int length, unsigned long value)
+int
+smf_format_vlq(unsigned char *buf, int length, unsigned long value)
 {
 	int i;
 	unsigned long buffer;
@@ -212,7 +212,7 @@ smf_event_new_textual(int type, const char *text)
 	event->midi_buffer[0] = 0xFF;
 	event->midi_buffer[1] = type;
 
-	vlq_length = format_vlq(event->midi_buffer + 2, MAX_VLQ_LENGTH - 2, text_length);
+	vlq_length = smf_format_vlq(event->midi_buffer + 2, MAX_VLQ_LENGTH - 2, text_length);
 	copied_length = snprintf((char *)event->midi_buffer + vlq_length + 2, event->midi_buffer_length - vlq_length - 2, "%s", text);
 
 	assert(copied_length == text_length);
@@ -231,7 +231,7 @@ write_vlq(smf_event_t *event, unsigned long value)
 	unsigned char buf[MAX_VLQ_LENGTH];
 	int vlq_length;
 
-	vlq_length = format_vlq(buf, MAX_VLQ_LENGTH, value);
+	vlq_length = smf_format_vlq(buf, MAX_VLQ_LENGTH, value);
 
 	return (track_append(event->track, buf, vlq_length));
 }