libspeex: Fix compile warnings on Apple Clang 21

- unused function parameters
- signed/unsigned comparisons
- unused local variable

Co-authored-by: ChatGPT (GPT-5.3 Mini) <chatgpt@openai.com>
Change-Id: I64e9e2573174377465b10e5912d10ca2a22da0e1

lib/rbcodec/codecs/libspeex/cb_search.c

@@ -53,6 +53,7 @@
 #ifndef OVERRIDE_COMPUTE_WEIGHTED_CODEBOOK
 static void compute_weighted_codebook(const signed char *shape_cb, const spx_word16_t *r, spx_word16_t *resp, spx_word16_t *resp2, spx_word32_t *E, int shape_cb_size, int subvect_size, char *stack)
 {
+   (void)resp2; (void)stack;
    int i, j, k;
    VARDECL(spx_word16_t *shape);
    ALLOC(shape, subvect_size, spx_word16_t);
@@ -590,6 +591,7 @@ int   complexity,
 int   update_target
 )
 {
+   (void)par; (void)r; (void)bits; (void)complexity; (void)update_target;
    int i;
    VARDECL(spx_word16_t *tmp);
    ALLOC(tmp, nsf, spx_word16_t);

lib/rbcodec/codecs/libspeex/filters.c

@@ -334,6 +334,7 @@ spx_word16_t compute_rms16(const spx_word16_t *x, int len)
 #ifndef OVERRIDE_FILTER_MEM16
 void filter_mem16(const spx_word16_t *x, const spx_coef_t *num, const spx_coef_t *den, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack)
 {
+   (void)stack;
    int i,j;
    spx_word16_t xi,yi,nyi;
    for (i=0;i<N;i++)
@@ -377,6 +378,7 @@ void iir_mem16(const spx_word16_t *x, const spx_coef_t *den, spx_word16_t *y, in
 #ifndef OVERRIDE_FIR_MEM16
 void fir_mem16(const spx_word16_t *x, const spx_coef_t *num, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack)
 {
+   (void)stack;
    int i,j;
    spx_word16_t xi,yi;
 
@@ -424,6 +426,7 @@ void residue_percep_zero16(const spx_word16_t *xx, const spx_coef_t *ak, const s
 #ifndef OVERRIDE_COMPUTE_IMPULSE_RESPONSE
 void compute_impulse_response(const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack)
 {
+   (void)stack;
    int i,j;
    spx_word16_t y1, ny1i, ny2i;
    VARDECL(spx_mem_t *mem1);
@@ -459,6 +462,7 @@ void compute_impulse_response(const spx_coef_t *ak, const spx_coef_t *awk1, cons
 /* Decomposes a signal into low-band and high-band using a QMF */
 void qmf_decomp(const spx_word16_t *xx, const spx_word16_t *aa, spx_word16_t *y1, spx_word16_t *y2, int N, int M, spx_word16_t *mem, char *stack)
 {
+   (void)stack;
    int i,j,k,M2;
    VARDECL(spx_word16_t *a);
    VARDECL(spx_word16_t *x);

lib/rbcodec/codecs/libspeex/lsp.c

@@ -180,6 +180,7 @@ static inline spx_word32_t cheb_poly_eva(
 
 static float cheb_poly_eva(spx_word32_t *coef, spx_word16_t x, int m, char *stack)
 {
+   (void)stack;
    int k;
    float b0, b1, tmp;
 
@@ -533,6 +534,7 @@ void lsp_to_lpc(spx_lsp_t *freq,spx_coef_t *ak,int lpcrdr, char *stack)
 
 
 {
+    (void)stack;
     int i,j;
     float xout1,xout2,xin1,xin2;
     VARDECL(float *Wp);

lib/rbcodec/codecs/libspeex/ltp.c

@@ -146,6 +146,7 @@ void pitch_xcorr(const spx_word16_t *_x, const spx_word16_t *_y, spx_word32_t *c
 #else
 void pitch_xcorr(const spx_word16_t *_x, const spx_word16_t *_y, spx_word32_t *corr, int len, int nb_pitch, char *stack)
 {
+   (void)stack;
    int i;
    for (i=0;i<nb_pitch;i++)
    {
@@ -372,6 +373,10 @@ spx_word32_t cumul_gain,
 int scaledown
 )
 {
+   (void)bits;
+#ifndef FIXED_POINT
+   (void)scaledown;
+#endif
    int i,j;
    VARDECL(spx_word16_t *tmp1);
    VARDECL(spx_word16_t *e);
@@ -553,6 +558,7 @@ int plc_tuning,
 spx_word32_t *cumul_gain
 )
 {
+   (void)pitch_coef;
    int i;
    int cdbk_index, pitch=0, best_gain_index=0;
    VARDECL(spx_sig_t *best_exc);
@@ -785,6 +791,8 @@ int plc_tuning,
 spx_word32_t *cumul_gain
 )
 {
+   (void)sw; (void)par; (void)end; (void)bits; (void)r; (void)complexity;
+   (void)cdbk_offset; (void)plc_tuning; (void)cumul_gain;
    int i;
    VARDECL(spx_word16_t *res);
    ALLOC(res, nsf, spx_word16_t);

lib/rbcodec/codecs/libspeex/resample.c

@@ -591,7 +591,7 @@ static void update_filter(SpeexResamplerState *st)
       }
       for (i=0;i<st->den_rate;i++)
       {
-         spx_int32_t j;
+         spx_uint32_t j;
          for (j=0;j<st->filt_len;j++)
          {
             st->sinc_table[i*st->filt_len+j] = sinc(st->cutoff,((j-(spx_int32_t)st->filt_len/2+1)-((float)i)/st->den_rate), st->filt_len, quality_map[st->quality].window_func);
@@ -663,7 +663,8 @@ static void update_filter(SpeexResamplerState *st)
       }
       for (i=st->nb_channels-1;i>=0;i--)
       {
-         spx_int32_t j;
+         spx_uint32_t j;
+         spx_int32_t k;
          spx_uint32_t olen = old_length;
          /*if (st->magic_samples[i])*/
          {
@@ -671,8 +672,8 @@ static void update_filter(SpeexResamplerState *st)
 
             /* FIXME: This is wrong but for now we need it to avoid going over the array bounds */
             olen = old_length + 2*st->magic_samples[i];
-            for (j=old_length-2+st->magic_samples[i];j>=0;j--)
-               st->mem[i*st->mem_alloc_size+j+st->magic_samples[i]] = st->mem[i*old_alloc_size+j];
+            for (k=old_length-2+st->magic_samples[i];k>=0;k--)
+               st->mem[i*st->mem_alloc_size+k+st->magic_samples[i]] = st->mem[i*old_alloc_size+k];
             for (j=0;j<st->magic_samples[i];j++)
                st->mem[i*st->mem_alloc_size+j] = 0;
             st->magic_samples[i] = 0;
@@ -841,7 +842,7 @@ EXPORT int speex_resampler_process_int(SpeexResamplerState *st, spx_uint32_t cha
 EXPORT int speex_resampler_process_float(SpeexResamplerState *st, spx_uint32_t channel_index, const float *in, spx_uint32_t *in_len, float *out, spx_uint32_t *out_len)
 #endif
 {
-   int j;
+   spx_uint32_t j;
    spx_uint32_t ilen = *in_len;
    spx_uint32_t olen = *out_len;
    spx_word16_t *x = st->mem + channel_index * st->mem_alloc_size;
@@ -882,7 +883,7 @@ EXPORT int speex_resampler_process_float(SpeexResamplerState *st, spx_uint32_t c
 EXPORT int speex_resampler_process_int(SpeexResamplerState *st, spx_uint32_t channel_index, const spx_int16_t *in, spx_uint32_t *in_len, spx_int16_t *out, spx_uint32_t *out_len)
 #endif
 {
-   int j;
+   spx_uint32_t j;
    const int istride_save = st->in_stride;
    const int ostride_save = st->out_stride;
    spx_uint32_t ilen = *in_len;

lib/rbcodec/codecs/libspeex/vbr.c

@@ -123,10 +123,11 @@ void vbr_init(VBRState *vbr)
 
 float vbr_analysis(VBRState *vbr, spx_word16_t *sig, int len, int pitch, float pitch_coef)
 {
+   (void)pitch;
    int i;
    float ener=0, ener1=0, ener2=0;
    float qual=7;
-   int va;
+   /* int va; */
    float log_energy;
    float non_st=0;
    float voicing;
@@ -159,7 +160,7 @@ float vbr_analysis(VBRState *vbr, spx_word16_t *sig, int len, int pitch, float p
        || (voicing<0 && non_st < .05))
    {
       float tmp;
-      va = 0;
+      /* va = 0; */
       vbr->consec_noise++;
       if (pow_ener > 3*vbr->noise_level)
          tmp = 3*vbr->noise_level;
@@ -171,7 +172,7 @@ float vbr_analysis(VBRState *vbr, spx_word16_t *sig, int len, int pitch, float p
          vbr->noise_accum_count = .95*vbr->noise_accum_count + .05;
       }
    } else {
-      va = 1;
+      /* va = 1; */
       vbr->consec_noise=0;
    }
 
@@ -270,6 +271,7 @@ float vbr_analysis(VBRState *vbr, spx_word16_t *sig, int len, int pitch, float p
 
 void vbr_destroy(VBRState *vbr)
 {
+   (void)vbr;
 }
 
 #endif /* #ifndef DISABLE_VBR */

lib/rbcodec/codecs/libspeex/vq.c

@@ -75,6 +75,7 @@ int scal_quant32(spx_word32_t in, const spx_word32_t *boundary, int entries)
 /*Finds the indices of the n-best entries in a codebook*/
 void vq_nbest(spx_word16_t *in, const spx_word16_t *codebook, int len, int entries, spx_word32_t *E, int N, int *nbest, spx_word32_t *best_dist, char *stack)
 {
+   (void)stack;
    int i,j,k,used;
    used = 0;
    for (i=0;i<entries;i++)
@@ -109,6 +110,7 @@ void vq_nbest(spx_word16_t *in, const spx_word16_t *codebook, int len, int entri
 /*Finds the indices of the n-best entries in a codebook with sign*/
 void vq_nbest_sign(spx_word16_t *in, const spx_word16_t *codebook, int len, int entries, spx_word32_t *E, int N, int *nbest, spx_word32_t *best_dist, char *stack)
 {
+   (void)stack;
    int i,j,k, sign, used;
    used=0;
    for (i=0;i<entries;i++)