fftools: Switch to const AVCodec * where possible

The obstacle to do so was in filter_codec_opts: It uses searches
the AVCodec for options via the AV_OPT_SEARCH_FAKE_OBJ method, which
requires using a void * that points to a pointer to a const AVClass.
When using const AVCodec *, one can not simply use a pointer that points
to the AVCodec's pointer to its AVClass, as said pointer is const, too.
This is fixed by using a temporary pointer to the AVClass.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index 423da071dc..8813eaf2e3 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -307,7 +307,7 @@ typedef struct InputStream {
 #define DECODING_FOR_FILTER 2
 
     AVCodecContext *dec_ctx;
-    AVCodec *dec;
+    const AVCodec *dec;
     AVFrame *decoded_frame;
     AVFrame *filter_frame; /* a ref of decoded_frame, to be sent to filters */
 
@@ -470,7 +470,7 @@ typedef struct OutputStream {
 
     AVCodecContext *enc_ctx;
     AVCodecParameters *ref_par; /* associated input codec parameters with encoders options applied */
-    AVCodec *enc;
+    const AVCodec *enc;
     int64_t max_frames;
     AVFrame *filtered_frame;
     AVFrame *last_frame;