[FFmpeg-devel] [PATCH 1/2] lavu/bprint: add av_bprint_get_buffer().

[Nicolas George]

It is useful to use bprint to handle a growing buffer
used with another API.

Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
---
 libavutil/bprint.c  |    9 +++++++++
 libavutil/bprint.h  |   12 ++++++++++++
 libavutil/version.h |    2 +-
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/libavutil/bprint.c b/libavutil/bprint.c
index 373a492..9d8e7c1 100644
--- a/libavutil/bprint.c
+++ b/libavutil/bprint.c
@@ -129,6 +129,15 @@ void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
     av_bprint_grow(buf, n);
 }
 
+void av_bprint_get_buffer(AVBPrint *buf, unsigned size,
+                          unsigned char **mem, unsigned *actual_size)
+{
+    if (size > av_bprint_room(buf))
+        av_bprint_alloc(buf, size);
+    *actual_size = av_bprint_room(buf);
+    *mem = *actual_size ? buf->str + buf->len : NULL;
+}
+
 void av_bprint_clear(AVBPrint *buf)
 {
     if (buf->len) {
diff --git a/libavutil/bprint.h b/libavutil/bprint.h
index 2bef18d..c09b61f 100644
--- a/libavutil/bprint.h
+++ b/libavutil/bprint.h
@@ -126,6 +126,18 @@ void av_bprintf(AVBPrint *buf, const char *fmt, ...) av_printf_format(2, 3);
 void av_bprint_chars(AVBPrint *buf, char c, unsigned n);
 
 /**
+ * Allocate bytes in the buffer for external use.
+ *
+ * @param[in]  buf          buffer structure
+ * @param[in]  size         required size
+ * @param[out] mem          pointer to the memory area
+ * @param[out] actual_size  size of the memory area after allocation;
+ *                          can be larger or smaller than size
+ */
+void av_bprint_get_buffer(AVBPrint *buf, unsigned size,
+                          unsigned char **mem, unsigned *actual_size);
+
+/**
  * Reset the string to "" but keep internal allocated data.
  */
 void av_bprint_clear(AVBPrint *buf);
diff --git a/libavutil/version.h b/libavutil/version.h
index 94a4a47..60a7450 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -75,7 +75,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  52
-#define LIBAVUTIL_VERSION_MINOR   1
+#define LIBAVUTIL_VERSION_MINOR   2
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
-- 
1.7.10.4