mp4: Mark callback function pointers as const.

The code in mp4.c never modifies any of the members of the callback
structure.

diff --git a/mp4.c b/mp4.c
index 23bd7934ac87db131331df06e78703d6ec5d0438..b8746e327ece4b4b192d0565cf9859bf71547ea2 100644 (file)
--- a/mp4.c
+++ b/mp4.c
@@ -44,7 +44,7 @@ struct mp4_track {
 #define MAX_TRACKS 1024
 
 struct mp4 {
-       struct mp4_callback *cb;
+       const struct mp4_callback *cb;
        int64_t current_position;
 
        uint64_t moov_offset;
@@ -1066,7 +1066,7 @@ static int32_t parse_atoms(struct mp4 *f, int meta_only)
        return 0;
 }
 
-struct mp4 *mp4_open_read(struct mp4_callback *cb)
+struct mp4 *mp4_open_read(const struct mp4_callback *cb)
 {
        struct mp4 *f = para_calloc(sizeof(struct mp4));
 
@@ -1279,7 +1279,7 @@ int32_t mp4_num_samples(const struct mp4 *f, int32_t track)
        return total;
 }
 
-struct mp4 *mp4_open_meta(struct mp4_callback *cb)
+struct mp4 *mp4_open_meta(const struct mp4_callback *cb)
 {
        struct mp4 *f = para_calloc(sizeof(struct mp4));
 
@@ -1896,7 +1896,8 @@ static int32_t write_int32(struct mp4 *f, uint32_t data)
        return write_data(f, temp, sizeof(temp));
 }
 
-int32_t mp4_meta_update(struct mp4_callback *cb, const struct mp4_metadata *data)
+int32_t mp4_meta_update(const struct mp4_callback *cb,
+               const struct mp4_metadata *data)
 {
        void *new_moov_data;
        uint32_t new_moov_size;

diff --git a/mp4.h b/mp4.h
index 1690b0dac5961ce93407d44b5a0638d6094ebfd2..7e9d24b81052878be666e5b7d096758f1407894e 100644 (file)
--- a/mp4.h
+++ b/mp4.h
@@ -22,18 +22,19 @@ struct mp4; /* opaque */
 void mp4_set_sample_position(struct mp4 *f, int32_t track, int32_t sample);
 int32_t mp4_total_tracks(const struct mp4 *f);
 bool mp4_is_audio_track(const struct mp4 *f, int32_t track);
-struct mp4 *mp4_open_read(struct mp4_callback *cb);
+struct mp4 *mp4_open_read(const struct mp4_callback *cb);
 void mp4_close(struct mp4 *f);
 int32_t mp4_get_sample_size(const struct mp4 *f, int track, int sample);
 uint32_t mp4_get_sample_rate(const struct mp4 *f, int32_t track);
 uint32_t mp4_get_channel_count(const struct mp4 * f, int32_t track);
 int32_t mp4_num_samples(const struct mp4 *f, int track);
 uint64_t mp4_get_duration(const struct mp4 *f, int32_t track);
-struct mp4 *mp4_open_meta(struct mp4_callback *cb);
+struct mp4 *mp4_open_meta(const struct mp4_callback *cb);
 
 int mp4_meta_get_by_index(const struct mp4 *f, unsigned int index,
                             char **item, char **value);
-int32_t mp4_meta_update(struct mp4_callback *cb, const struct mp4_metadata *data);
+int32_t mp4_meta_update(const struct mp4_callback *cb,
+               const struct mp4_metadata *data);
 
 int mp4_meta_get_num_items(const struct mp4 *f);
 int mp4_meta_get_artist(const struct mp4 *f, char **value);