diff options
Diffstat (limited to 'src/modules/bluetooth/sbc/sbc_primitives.c')
-rw-r--r-- | src/modules/bluetooth/sbc/sbc_primitives.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/src/modules/bluetooth/sbc/sbc_primitives.c b/src/modules/bluetooth/sbc/sbc_primitives.c index 2105280e..82cd399d 100644 --- a/src/modules/bluetooth/sbc/sbc_primitives.c +++ b/src/modules/bluetooth/sbc/sbc_primitives.c @@ -439,6 +439,80 @@ static void sbc_calc_scalefactors( } } +static int sbc_calc_scalefactors_j( + int32_t sb_sample_f[16][2][8], + uint32_t scale_factor[2][8], + int blocks, int subbands) +{ + int blk, joint = 0; + int32_t tmp0, tmp1; + uint32_t x, y; + + /* last subband does not use joint stereo */ + int sb = subbands - 1; + x = 1 << SCALE_OUT_BITS; + y = 1 << SCALE_OUT_BITS; + for (blk = 0; blk < blocks; blk++) { + tmp0 = fabs(sb_sample_f[blk][0][sb]); + tmp1 = fabs(sb_sample_f[blk][1][sb]); + if (tmp0 != 0) + x |= tmp0 - 1; + if (tmp1 != 0) + y |= tmp1 - 1; + } + scale_factor[0][sb] = (31 - SCALE_OUT_BITS) - sbc_clz(x); + scale_factor[1][sb] = (31 - SCALE_OUT_BITS) - sbc_clz(y); + + /* the rest of subbands can use joint stereo */ + while (--sb >= 0) { + int32_t sb_sample_j[16][2]; + x = 1 << SCALE_OUT_BITS; + y = 1 << SCALE_OUT_BITS; + for (blk = 0; blk < blocks; blk++) { + tmp0 = sb_sample_f[blk][0][sb]; + tmp1 = sb_sample_f[blk][1][sb]; + sb_sample_j[blk][0] = ASR(tmp0, 1) + ASR(tmp1, 1); + sb_sample_j[blk][1] = ASR(tmp0, 1) - ASR(tmp1, 1); + tmp0 = fabs(tmp0); + tmp1 = fabs(tmp1); + if (tmp0 != 0) + x |= tmp0 - 1; + if (tmp1 != 0) + y |= tmp1 - 1; + } + scale_factor[0][sb] = (31 - SCALE_OUT_BITS) - + sbc_clz(x); + scale_factor[1][sb] = (31 - SCALE_OUT_BITS) - + sbc_clz(y); + x = 1 << SCALE_OUT_BITS; + y = 1 << SCALE_OUT_BITS; + for (blk = 0; blk < blocks; blk++) { + tmp0 = fabs(sb_sample_j[blk][0]); + tmp1 = fabs(sb_sample_j[blk][1]); + if (tmp0 != 0) + x |= tmp0 - 1; + if (tmp1 != 0) + y |= tmp1 - 1; + } + x = (31 - SCALE_OUT_BITS) - sbc_clz(x); + y = (31 - SCALE_OUT_BITS) - sbc_clz(y); + + /* decide whether to use joint stereo for this subband */ + if ((scale_factor[0][sb] + scale_factor[1][sb]) > x + y) { + joint |= 1 << (subbands - 1 - sb); + scale_factor[0][sb] = x; + scale_factor[1][sb] = y; + for (blk = 0; blk < blocks; blk++) { + sb_sample_f[blk][0][sb] = sb_sample_j[blk][0]; + sb_sample_f[blk][1][sb] = sb_sample_j[blk][1]; + } + } + } + + /* bitmask with the information about subbands using joint stereo */ + return joint; +} + /* * Detect CPU features and setup function pointers */ @@ -456,6 +530,7 @@ void sbc_init_primitives(struct sbc_encoder_state *state) /* Default implementation for scale factors calculation */ state->sbc_calc_scalefactors = sbc_calc_scalefactors; + state->sbc_calc_scalefactors_j = sbc_calc_scalefactors_j; state->implementation_info = "Generic C"; /* X86/AMD64 optimizations */ |