compute_stereo_samples()

static void fl::third_party::vorbis::compute_stereo_samples ( short * output, int32_t num_c, float ** data, int32_t d_offset, int32_t len )

static

Definition at line 4970 of file stb_vorbis.cpp.hpp.

{
   constexpr int32_t STB_BUFFER_SIZE = 32;
   float buffer[STB_BUFFER_SIZE];
   int32_t i,j,o,n = STB_BUFFER_SIZE >> 1;
   // o is the offset in the source data
   fl_stbv_check_endianness();
   for (o = 0; o < len; o += STB_BUFFER_SIZE >> 1) {
      // o2 is the offset in the output data
      int32_t o2 = o << 1;
      memset(buffer, 0, sizeof(buffer));
      if (o + n > len) n = len - o;
      for (j=0; j < num_c; ++j) {
         int32_t m = channel_position[num_c][j] & (PLAYBACK_LEFT | PLAYBACK_RIGHT);
         if (m == (PLAYBACK_LEFT | PLAYBACK_RIGHT)) {
            for (i=0; i < n; ++i) {
               buffer[i*2+0] += data[j][d_offset+o+i];
               buffer[i*2+1] += data[j][d_offset+o+i];
            }
         } else if (m == PLAYBACK_LEFT) {
            for (i=0; i < n; ++i) {
               buffer[i*2+0] += data[j][d_offset+o+i];
            }
         } else if (m == PLAYBACK_RIGHT) {
            for (i=0; i < n; ++i) {
               buffer[i*2+1] += data[j][d_offset+o+i];
            }
         }
      }
      for (i=0; i < (n<<1); ++i) {
         FL_STBV_FASTDEF(temp);
         int32_t v = FL_STBV_FAST_SCALED_FLOAT_TO_INT(temp,buffer[i],15);
         if ((uint32_t) (v + 32768) > 65535)
            v = v < 0 ? -32768 : 32767;
         output[o2+i] = v;
      }
   }
}

References channel_position, FL_NOEXCEPT, fl_stbv_check_endianness, FL_STBV_FAST_SCALED_FLOAT_TO_INT, FL_STBV_FASTDEF, memset(), PLAYBACK_LEFT, and PLAYBACK_RIGHT.

Referenced by convert_channels_short_interleaved().

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