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path: root/src/modules/bluetooth/sbc/sbc.c
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* bluetooth: Run 'make update-sbc'Colin Guthrie2011-03-201-11/+15
| | | | Note that changes to ipc.h from 8f3ef04b had to be manually reapplied.
* sbc: faster 'sbc_calculate_bits' functionSiarhei Siamashka2011-03-141-15/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | By using SBC_ALWAYS_INLINE trick, the implementation of 'sbc_calculate_bits' function is split into two branches, each having 'subband' variable value known at compile time. It helps the compiler to generate more optimal code by saving at least one extra register, and also provides more obvious opportunities for loops unrolling. Benchmarked on ARM Cortex-A8: == Before: == $ time ./sbcenc -b53 -s8 -j test.au > /dev/null real 0m3.989s user 0m3.602s sys 0m0.391s samples % image name symbol name 26057 32.6128 sbcenc sbc_pack_frame 20003 25.0357 sbcenc sbc_analyze_4b_8s_neon 14220 17.7977 sbcenc sbc_calculate_bits 8498 10.6361 no-vmlinux /no-vmlinux 5300 6.6335 sbcenc sbc_calc_scalefactors_j_neon 3235 4.0489 sbcenc sbc_enc_process_input_8s_be_neon 2172 2.7185 sbcenc sbc_encode == After: == $ time ./sbcenc -b53 -s8 -j test.au > /dev/null real 0m3.652s user 0m3.195s sys 0m0.445s samples % image name symbol name 26207 36.0095 sbcenc sbc_pack_frame 19820 27.2335 sbcenc sbc_analyze_4b_8s_neon 8629 11.8566 no-vmlinux /no-vmlinux 6988 9.6018 sbcenc sbc_calculate_bits 5094 6.9994 sbcenc sbc_calc_scalefactors_j_neon 3351 4.6044 sbcenc sbc_enc_process_input_8s_be_neon 2182 2.9982 sbcenc sbc_encode
* sbc: fix signedness of parametersSiarhei Siamashka2011-03-141-4/+5
| | | | | The written parameter of sbc_encode can be negative so it should be ssize_t instead of size_t.
* sbc: ARM NEON optimization for scale factors calculationSiarhei Siamashka2011-03-141-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Improves SBC encoding performance when joint stereo is not used. Benchmarked on ARM Cortex-A8: == Before: == $ time ./sbcenc -b53 -s8 test.au > /dev/null real 0m4.756s user 0m4.313s sys 0m0.438s samples % image name symbol name 2569 27.6296 sbcenc sbc_pack_frame 1934 20.8002 sbcenc sbc_analyze_4b_8s_neon 1386 14.9064 sbcenc sbc_calculate_bits 1221 13.1319 sbcenc sbc_calc_scalefactors 996 10.7120 sbcenc sbc_enc_process_input_8s_be 878 9.4429 no-vmlinux /no-vmlinux 204 2.1940 sbcenc sbc_encode 56 0.6023 libc-2.10.1.so memcpy == After: == $ time ./sbcenc -b53 -s8 test.au > /dev/null real 0m4.220s user 0m3.797s sys 0m0.422s samples % image name symbol name 2563 31.3249 sbcenc sbc_pack_frame 1892 23.1239 sbcenc sbc_analyze_4b_8s_neon 1368 16.7196 sbcenc sbc_calculate_bits 961 11.7453 sbcenc sbc_enc_process_input_8s_be 836 10.2176 no-vmlinux /no-vmlinux 262 3.2022 sbcenc sbc_calc_scalefactors_neon 199 2.4322 sbcenc sbc_encode 49 0.5989 libc-2.10.1.so memcpy
* sbc: new 'sbc_calc_scalefactors_j' function added to sbc primitivesSiarhei Siamashka2011-03-141-68/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | The code for scale factors calculation with joint stereo support has been moved to a separate function. It can get platform-specific SIMD optimizations later for best possible performance. But even this change in C code improves performance because of the use of __builtin_clz() instead of loops similar to what was done to sbc_calc_scalefactors earlier. Also technically it does loop unrolling by processing two channels at once, which might be either good or bad for performance (if the registers pressure is increased and more data is spilled to memory). But the benchmark from 32-bit x86 system (pentium-m) shows that it got clearly faster: $ time ./sbcenc.old -b53 -s8 -j test.au > /dev/null real 0m1.868s user 0m1.808s sys 0m0.048s $ time ./sbcenc.new -b53 -s8 -j test.au > /dev/null real 0m1.742s user 0m1.668s sys 0m0.064s
* sbc: Fix redundant null check on calling free()Gustavo F. Padovan2011-03-141-2/+1
| | | | Issues found by smatch static check: http://smatch.sourceforge.net/
* sbc: added saturated clipping of decoder output to 16-bitSiarhei Siamashka2011-03-141-5/+15
| | | | | | This prevents overflows and audible artefacts for the audio files which originally had loudness maximized. Music from audio CD disks is an example of such files, see http://en.wikipedia.org/wiki/Loudness_war
* sbc: ensure 16-byte buffer position alignment for 4 subbands encodingSiarhei Siamashka2011-03-141-1/+1
| | | | | | | Buffer position in X array was not always 16-bytes aligned. Strict 16-byte alignment is strictly required for powerpc altivec simd optimizations because altivec does not have support for unaligned vector loads at all.
* build: move sbc related files to its own directoryLuiz Augusto von Dentz2011-03-141-0/+1252
This should make it easier to apply patches from BlueZ which also uses sbc subdir for this files.
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