From 0a0f19b577d54ff2e72cc9a0fe027952db83f332 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Sat, 11 Aug 2012 14:50:36 +0200
Subject: [PATCH] lavc: add const to AVCodec* function parameters.

---
 libavcodec/avcodec.h | 14 +++++++-------
 libavcodec/options.c |  6 ++++--
 libavcodec/utils.c   | 11 ++++++-----
 3 files changed, 17 insertions(+), 14 deletions(-)

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 2747c7a94b..b6917a0a7d 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -1298,7 +1298,7 @@ typedef struct AVCodecContext {
     int log_level_offset;
 
     enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
-    struct AVCodec  *codec;
+    const struct AVCodec  *codec;
     char             codec_name[32];
     enum AVCodecID     codec_id; /* see AV_CODEC_ID_xxx */
 
@@ -3150,7 +3150,7 @@ typedef struct AVSubtitle {
  * if c is non-NULL, returns the next registered codec after c,
  * or NULL if c is the last one.
  */
-AVCodec *av_codec_next(AVCodec *c);
+AVCodec *av_codec_next(const AVCodec *c);
 
 /**
  * Return the LIBAVCODEC_VERSION_INT constant.
@@ -3204,7 +3204,7 @@ void avcodec_register_all(void);
  * @return An AVCodecContext filled with default values or NULL on failure.
  * @see avcodec_get_context_defaults
  */
-AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
+AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
 
 /**
  * Set the fields of the given AVCodecContext to default values corresponding
@@ -3215,7 +3215,7 @@ AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
  * If codec is non-NULL, it is illegal to call avcodec_open2() with a
  * different codec on this AVCodecContext.
  */
-int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
+int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
 
 /**
  * Get the AVClass for AVCodecContext. It can be used in combination with
@@ -3290,7 +3290,7 @@ void avcodec_get_frame_defaults(AVFrame *pic);
  * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
  *      av_dict_set(), av_opt_find().
  */
-int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
+int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
 
 /**
  * Close a given AVCodecContext and free all the data associated with it
@@ -4527,12 +4527,12 @@ int avcodec_is_open(AVCodecContext *s);
 /**
  * @return a non-zero number if codec is an encoder, zero otherwise
  */
-int av_codec_is_encoder(AVCodec *codec);
+int av_codec_is_encoder(const AVCodec *codec);
 
 /**
  * @return a non-zero number if codec is a decoder, zero otherwise
  */
-int av_codec_is_decoder(AVCodec *codec);
+int av_codec_is_decoder(const AVCodec *codec);
 
 /**
  * @return descriptor for given codec ID or NULL if no descriptor exists.
diff --git a/libavcodec/options.c b/libavcodec/options.c
index 8b1f6a3bc8..25018b9b97 100644
--- a/libavcodec/options.c
+++ b/libavcodec/options.c
@@ -77,7 +77,8 @@ static const AVClass av_codec_context_class = {
     .child_class_next        = codec_child_class_next,
 };
 
-int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec){
+int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
+{
     memset(s, 0, sizeof(AVCodecContext));
 
     s->av_class = &av_codec_context_class;
@@ -122,7 +123,8 @@ int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec){
     return 0;
 }
 
-AVCodecContext *avcodec_alloc_context3(AVCodec *codec){
+AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)
+{
     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
 
     if(avctx==NULL) return NULL;
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 43a8f67934..b5b0466650 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -96,7 +96,8 @@ void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
 /* encoder management */
 static AVCodec *first_avcodec = NULL;
 
-AVCodec *av_codec_next(AVCodec *c){
+AVCodec *av_codec_next(const AVCodec *c)
+{
     if(c) return c->next;
     else  return first_avcodec;
 }
@@ -112,12 +113,12 @@ static void avcodec_init(void)
     ff_dsputil_static_init();
 }
 
-int av_codec_is_encoder(AVCodec *codec)
+int av_codec_is_encoder(const AVCodec *codec)
 {
     return codec && (codec->encode || codec->encode2);
 }
 
-int av_codec_is_decoder(AVCodec *codec)
+int av_codec_is_decoder(const AVCodec *codec)
 {
     return codec && codec->decode;
 }
@@ -627,7 +628,7 @@ AVFrame *avcodec_alloc_frame(void){
     return pic;
 }
 
-int attribute_align_arg avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options)
+int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
 {
     int ret = 0;
     AVDictionary *tmp = NULL;
@@ -1508,7 +1509,7 @@ void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
 {
     const char *codec_name;
     const char *profile = NULL;
-    AVCodec *p;
+    const AVCodec *p;
     char buf1[32];
     int bitrate;
     AVRational display_aspect_ratio;