add some consts

diff --git a/include/FLAC/format.h b/include/FLAC/format.h
index 37987a1..024f797 100644 (file)
--- a/include/FLAC/format.h
+++ b/include/FLAC/format.h
@@ -120,7 +120,7 @@ typedef struct {
  * n*i: unencoded signal; n = frame's bits-per-sample, i = frame's blocksize
  */
 typedef struct {
-       int32 *data;
+       const int32 *data;
 } FLAC__Subframe_Verbatim;
 
 /*****************************************************************************
@@ -134,7 +134,7 @@ typedef struct {
        FLAC__EntropyCodingMethod entropy_coding_method;
        unsigned order;
        int32 warmup[FLAC__MAX_FIXED_ORDER];
-       int32 *residual;
+       const int32 *residual;
 } FLAC__Subframe_Fixed;
 
 /*****************************************************************************
@@ -154,7 +154,7 @@ typedef struct {
        int quantization_level;
        int32 qlp_coeff[FLAC__MAX_LPC_ORDER];
        int32 warmup[FLAC__MAX_LPC_ORDER];
-       int32 *residual;
+       const int32 *residual;
 } FLAC__Subframe_LPC;
 
 extern const unsigned FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN; /* = 4 bits */