avcodec: fix sign of codec ID

In C, an enumeration is unsigned unless it contains an explicit negative
member.

modules/codec/avcodec/avcodec.c

@@ -258,7 +258,8 @@ vlc_module_end ()
 static int OpenDecoder( vlc_object_t *p_this )
 {
     decoder_t *p_dec = (decoder_t*) p_this;
-    int i_cat, i_codec_id, i_result;
+    unsigned i_codec_id;
+    int i_cat, i_result;
     const char *psz_namecodec;
 
     AVCodecContext *p_context = NULL;

modules/codec/avcodec/avcodec.h

@@ -26,8 +26,8 @@
 
 /* VLC <-> avcodec tables */
 int GetFfmpegCodec( vlc_fourcc_t i_fourcc, int *pi_cat,
-                    int *pi_ffmpeg_codec, const char **ppsz_name );
-int GetVlcFourcc( int i_ffmpeg_codec, int *pi_cat,
+                    unsigned *pi_ffmpeg_codec, const char **ppsz_name );
+int GetVlcFourcc( unsigned i_ffmpeg_codec, int *pi_cat,
                   vlc_fourcc_t *pi_fourcc, const char **ppsz_name );
 vlc_fourcc_t GetVlcAudioFormat( int i_sample_fmt );
 

modules/codec/avcodec/encoder.c

@@ -203,7 +203,8 @@ int OpenEncoder( vlc_object_t *p_this )
     encoder_sys_t *p_sys;
     AVCodecContext *p_context;
     AVCodec *p_codec = NULL;
-    int i_codec_id, i_cat;
+    unsigned i_codec_id;
+    int i_cat;
     const char *psz_namecodec;
     float f_val;
     char *psz_val;

modules/codec/avcodec/fourcc.c

@@ -38,7 +38,7 @@
 static const struct
 {
     vlc_fourcc_t i_fourcc;
-    int  i_codec;
+    unsigned i_codec;
     int i_cat;
 } codecs_table[] =
 {
@@ -451,7 +451,7 @@ static const size_t codecs_count = sizeof (codecs_table)
                                  / sizeof (codecs_table[0]);
 
 int GetFfmpegCodec( vlc_fourcc_t i_fourcc, int *pi_cat,
-                    int *pi_ffmpeg_codec, const char **ppsz_name )
+                    unsigned *pi_ffmpeg_codec, const char **ppsz_name )
 {
     i_fourcc = vlc_fourcc_GetCodec( UNKNOWN_ES, i_fourcc );
     for( unsigned i = 0; i < codecs_count; i++ )
@@ -468,7 +468,7 @@ int GetFfmpegCodec( vlc_fourcc_t i_fourcc, int *pi_cat,
     return false;
 }
 
-int GetVlcFourcc( int i_ffmpeg_codec, int *pi_cat,
+int GetVlcFourcc( unsigned i_ffmpeg_codec, int *pi_cat,
                   vlc_fourcc_t *pi_fourcc, const char **ppsz_name )
 {
     for( unsigned i = 0; i < codecs_count; i++ )

modules/demux/avformat/mux.c

@@ -164,7 +164,7 @@ static int AddStream( sout_mux_t *p_mux, sout_input_t *p_input )
     sout_mux_sys_t *p_sys = p_mux->p_sys;
     AVCodecContext *codec;
     AVStream *stream;
-    int i_codec_id;
+    unsigned i_codec_id;
 
     msg_Dbg( p_mux, "adding input" );