swresample: add swr_is_initialized()

Idea-from/based-on: 7e86c27b4ee9e5a3fbe6cf5249b9d918b2a5e731
Reviewed-by: ubitux
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

3 files changed, 13 insertions, 2 deletions

diff --git a/libswresample/swresample.c b/libswresample/swresample.c
index bc1853f..e11826e 100644
--- a/libswresample/swresample.c
+++ b/libswresample/swresample.c
@@ -733,6 +733,10 @@ static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_co
     return out_count;
 }
 
+int swr_is_initialized(struct SwrContext *s) {
+    return !!s->in_buffer.ch_count;
+}
+
 int swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count,
                                 const uint8_t *in_arg [SWR_CH_MAX], int  in_count){
     AudioData * in= &s->in;
diff --git a/libswresample/swresample.h b/libswresample/swresample.h
index 3811301..4ba008e 100644
--- a/libswresample/swresample.h
+++ b/libswresample/swresample.h
@@ -166,6 +166,13 @@ struct SwrContext *swr_alloc(void);
 int swr_init(struct SwrContext *s);
 
 /**
+ * Check whether an swr context has been initialized or not.
+ *
+ * @return positive if it has been initialized, 0 if not initialized
+ */
+int swr_is_initialized(struct SwrContext *s);
+
+/**
  * Allocate SwrContext if needed and set/reset common parameters.
  *
  * This function does not require s to be allocated with swr_alloc(). On the
diff --git a/libswresample/version.h b/libswresample/version.h
index 464c86d..3a92875 100644
--- a/libswresample/version.h
+++ b/libswresample/version.h
@@ -29,8 +29,8 @@
 #include "libavutil/avutil.h"
 
 #define LIBSWRESAMPLE_VERSION_MAJOR 0
-#define LIBSWRESAMPLE_VERSION_MINOR 17
-#define LIBSWRESAMPLE_VERSION_MICRO 104
+#define LIBSWRESAMPLE_VERSION_MINOR 18
+#define LIBSWRESAMPLE_VERSION_MICRO 100
 
 #define LIBSWRESAMPLE_VERSION_INT  AV_VERSION_INT(LIBSWRESAMPLE_VERSION_MAJOR, \
                                                   LIBSWRESAMPLE_VERSION_MINOR, \