EXPORT int speex_resampler_process_float()

in subprojects/speex/resample.c [966:1037]

• 65 lines of code
• 14 McCabe index (conditional complexity)

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)
#else
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;
   const int istride_save = st->in_stride;
   const int ostride_save = st->out_stride;
   spx_uint32_t ilen = *in_len;
   spx_uint32_t olen = *out_len;
   spx_word16_t *x = st->mem + channel_index * st->mem_alloc_size;
   const spx_uint32_t xlen = st->mem_alloc_size - (st->filt_len - 1);
#ifdef VAR_ARRAYS
   const unsigned int ylen = (olen < FIXED_STACK_ALLOC) ? olen : FIXED_STACK_ALLOC;
   VARDECL(spx_word16_t *ystack);
   ALLOC(ystack, ylen, spx_word16_t);
#else
   const unsigned int ylen = FIXED_STACK_ALLOC;
   spx_word16_t ystack[FIXED_STACK_ALLOC];
#endif

   st->out_stride = 1;

   while (ilen && olen) {
     spx_word16_t *y = ystack;
     spx_uint32_t ichunk = (ilen > xlen) ? xlen : ilen;
     spx_uint32_t ochunk = (olen > ylen) ? ylen : olen;
     spx_uint32_t omagic = 0;

     if (st->magic_samples[channel_index]) {
       omagic = speex_resampler_magic(st, channel_index, &y, ochunk);
       ochunk -= omagic;
       olen -= omagic;
     }
     if (! st->magic_samples[channel_index]) {
       if (in) {
         for(j=0;j<ichunk;++j)
#ifdef FIXED_POINT
           x[j+st->filt_len-1]=WORD2INT(in[j*istride_save]);
#else
           x[j+st->filt_len-1]=in[j*istride_save];
#endif
       } else {
         for(j=0;j<ichunk;++j)
           x[j+st->filt_len-1]=0;
       }

       speex_resampler_process_native(st, channel_index, &ichunk, y, &ochunk);
     } else {
       ichunk = 0;
       ochunk = 0;
     }

     for (j=0;j<ochunk+omagic;++j)
#ifdef FIXED_POINT
        out[j*ostride_save] = ystack[j];
#else
        out[j*ostride_save] = WORD2INT(ystack[j]);
#endif

     ilen -= ichunk;
     olen -= ochunk;
     out += (ochunk+omagic) * ostride_save;
     if (in)
       in += ichunk * istride_save;
   }
   st->out_stride = ostride_save;
   *in_len -= ilen;
   *out_len -= olen;

   return st->resampler_ptr == resampler_basic_zero ? RESAMPLER_ERR_ALLOC_FAILED : RESAMPLER_ERR_SUCCESS;
}