ac3enc: do not right-shift fixed-point coefficients in the final MDCT stage.
This increases the accuracy of coefficients, leading to improved quality.Rescaling of the coefficients to full 25-bit accuracy is done rather thanoffsetting the exponent values. This requires coefficient scaling to be done...
ac3enc: fix bug in stereo rematrixing decision.
The rematrixing strategy reuse flags are not reset between frames, so theyneed to be initialized for all blocks, not just block 0.
Signed-off-by: Mans Rullgard <firstname.lastname@example.org>
Add stereo rematrixing support to the AC-3 encoders.This improves the audio quality significantly for stereo source with both thefixed-point and floating-point AC-3 encoders.Update acodec-ac3_fixed and seek-ac3_rm test references.
Originally committed as revision 26271 to svn://svn.ffmpeg.org/ffmpeg/trunk
Change the default dB-per-bit code from 2 to 3.This gives slightly better quality in PEAQ tests.Code 3 gives a dBpb value of 2816 = -132dB (128 psd units = -6dB), whichcorresponds to 22 bits. Since the exponents have an offset applied, the16-bit source looks like 24-bit source to the bit allocation routine....
Change FIX15 back to clipping to -32767..32767.This avoids a 16-bit overflow in mdct512() due to a -32768 value in costab.References updated for acodec-ac3, lavf-rm, and seek-ac3_rm tests.Thanks to Måns Rullgård for finding the bug.
Originally committed as revision 26071 to svn://svn.ffmpeg.org/ffmpeg/trunk
Update the test references for lavf-rm and seek-ac3_rm.The references changed due to r25956.
Originally committed as revision 26004 to svn://svn.ffmpeg.org/ffmpeg/trunk
regtest: rename seektest ref files using alphanumeric chars only
Originally committed as revision 24345 to svn://svn.ffmpeg.org/ffmpeg/trunk