avcodec/ac3dsp: make len a size_t in float_to_fixed24

Should simplify asm implementations, and prevent UB on at least win64.
Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/ac3dsp.c

@@ -54,7 +54,7 @@ static void ac3_exponent_min_c(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
     }
 }
 
-static void float_to_fixed24_c(int32_t *dst, const float *src, unsigned int len)
+static void float_to_fixed24_c(int32_t *dst, const float *src, size_t len)
 {
     const float scale = 1 << 24;
     do {

libavcodec/ac3dsp.h

@@ -53,7 +53,7 @@ typedef struct AC3DSPContext {
      * @param len number of elements to convert.
      *            constraints: multiple of 32 greater than zero
      */
-    void (*float_to_fixed24)(int32_t *dst, const float *src, unsigned int len);
+    void (*float_to_fixed24)(int32_t *dst, const float *src, size_t len);
 
     /**
      * Calculate bit allocation pointers.

libavcodec/arm/ac3dsp_init_arm.c

@@ -26,7 +26,7 @@
 #include "config.h"
 
 void ff_ac3_exponent_min_neon(uint8_t *exp, int num_reuse_blocks, int nb_coefs);
-void ff_float_to_fixed24_neon(int32_t *dst, const float *src, unsigned int len);
+void ff_float_to_fixed24_neon(int32_t *dst, const float *src, size_t len);
 void ff_ac3_extract_exponents_neon(uint8_t *exp, int32_t *coef, int nb_coefs);
 void ff_ac3_sum_square_butterfly_int32_neon(int64_t sum[4],
                                             const int32_t *coef0,

libavcodec/mips/ac3dsp_mips.c

@@ -203,7 +203,7 @@ static void ac3_update_bap_counts_mips(uint16_t mant_cnt[16], uint8_t *bap,
 
 #if HAVE_MIPSFPU
 #if !HAVE_MIPS32R6 && !HAVE_MIPS64R6
-static void float_to_fixed24_mips(int32_t *dst, const float *src, unsigned int len)
+static void float_to_fixed24_mips(int32_t *dst, const float *src, size_t len)
 {
     const float scale = 1 << 24;
     float src0, src1, src2, src3, src4, src5, src6, src7;

libavcodec/x86/ac3dsp_init.c

@@ -26,7 +26,7 @@
 
 void ff_ac3_exponent_min_sse2  (uint8_t *exp, int num_reuse_blocks, int nb_coefs);
 
-void ff_float_to_fixed24_sse2 (int32_t *dst, const float *src, unsigned int len);
+void ff_float_to_fixed24_sse2 (int32_t *dst, const float *src, size_t len);
 
 int ff_ac3_compute_mantissa_size_sse2(uint16_t mant_cnt[6][16]);