x86: sbrdsp: Implement SSE2 qmf_deint_bfly

Sandybridge: 47 cycles

Having a loop counter is a 7 cycle gain.
Unrolling is another 7 cycle gain.
Working in reverse scan is another 6 cycles.

Signed-off-by: Diego Biurrun <diego@biurrun.de>
sbrdsp: Unroll sbr_autocorrelate_c

1410 cycles to 1148 on Arrandale/Win64

Signed-off-by: Diego Biurrun <diego@biurrun.de>
sbrdsp: Unroll and use integer operations

This patch can be controversial, by assuming floats are IEEE-754 and
particular behaviour of the FPU will get in the way.
Timing on Arrandale and Win32 (thus, x87 FPU is used in the reference).

sbr_qmf_pre_shuffle_c: 115 to 76
sbr_neg_odd_64_c: 84 to 55
sbr_qmf_post_shuffle_c: 112 to 83

Signed-off-by: Diego Biurrun <diego@biurrun.de>
silly typo fixes
wav: return meaningful errors
Merge commit '4a7af92cc80ced8498626401ed21f25ffe6740c8'

* commit '4a7af92cc80ced8498626401ed21f25ffe6740c8':
  sbrdsp: Unroll and use integer operations
  sbrdsp: Unroll sbr_autocorrelate_c
  x86: sbrdsp: Implement SSE2 qmf_deint_bfly

Conflicts:
	libavcodec/sbrdsp.c
	libavcodec/x86/sbrdsp.asm
	libavcodec/x86/sbrdsp_init.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'a5f8873620ce502d37d0cc3ef93ada2ea8fb8de7'

* commit 'a5f8873620ce502d37d0cc3ef93ada2ea8fb8de7':
  silly typo fixes

Conflicts:
	doc/protocols.texi
	libavcodec/aacpsy.c
	libavformat/utils.c
	tools/patcheck

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  wav: return meaningful errors

Conflicts:
	libavformat/wavdec.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
aacdec: free frame buffer if no audio was decoded

If no decoding error was detected, but still no audio was decoded, the
frame needs to be free'ed, or it will leak.

Fixes part of ticket #2095

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>