swresample: add swr_is_initialized()

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

1 files changed, 4 insertions, 0 deletions

diff --git a/libswresample/swresample.c b/libswresample/swresample.c
index bc1853f23f..e11826eea2 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;