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Lynne e8f054b095 lavu/tx: implement 32 bit fixed point FFT and MDCT 
Required minimal changes to the code so made sense to implement.
FFT and MDCT tested, the output of both was properly rounded.
Fun fact: the non-power-of-two fixed-point FFT and MDCT are the fastest ever
non-power-of-two fixed-point FFT and MDCT written.
This can replace the power of two integer MDCTs in aac and ac3 if the
MIPS optimizations are ported across.
Unfortunately the ac3 encoder uses a 16-bit fixed point forward transform,
unlike the encoder which uses a 32bit inverse transform, so some modifications
might be required there.

The 3-point FFT is somewhat less accurate than it otherwise could be,
having minor rounding errors with bigger transforms. However, this
could be improved later, and the way its currently written is the way one
would write assembly for it.
Similar rounding errors can also be found throughout the power of two FFTs
as well, though those are more difficult to correct.
Despite this, the integer transforms are more than accurate enough.
2020-02-13 17:10:34 +00:00
..
doxy Merge commit '257f00ec1a' 2016-06-22 11:28:51 +02:00
examples doc/examples/muxing: fix underflow in duration of encoded streams 2019-09-29 20:41:29 +02:00
.gitignore Merge commit '257f00ec1a' 2016-06-22 11:28:51 +02:00
APIchanges lavu/tx: implement 32 bit fixed point FFT and MDCT 2020-02-13 17:10:34 +00:00
authors.texi
bitstream_filters.texi doc/bitstream_filters: Fix copy an paste typo 2019-11-05 21:21:32 +01:00
bootstrap.min.css
build_system.txt tools: add a fuzzer tool for bitstream filters 2019-12-05 20:49:15 -03:00
codecs.texi doc/codecs: Update documentation for flags/flags2 2019-10-06 17:33:00 +08:00
decoders.texi doc: Fix typo for dvdsubdec 2020-02-03 23:25:36 +01:00
default.css
demuxers.texi avformat/img2dec: add option to provide metadata fields related to input path 2020-01-10 23:08:18 +01:00
developer.texi doc/developer: update style guidelines to include for loops with declarations 2018-05-18 02:24:28 +01:00
devices.texi
doxy-wrapper.sh doc: make apidoc output independent of SRC_PATH 2016-01-02 12:11:36 +01:00
Doxyfile doc: fix spelling errors 2016-10-21 23:58:47 +02:00
encoders.texi avcodec/libvpxenc: add a way to explicitly set temporal layer id 2020-02-11 11:55:36 -08:00
errno.txt doc/errno: fix description typo for ENAMETOOLONG 2015-12-18 04:04:14 +01:00
faq.texi doc/faq: update macOS and URLs 2019-02-11 10:13:31 +05:30
fate.texi doc/fate: Document how to request samples upload access 2019-08-09 01:33:49 +02:00
fate_config.sh.template Merge commit '35d1f726eb' 2017-05-05 09:27:18 +02:00
ffmpeg-bitstream-filters.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
ffmpeg-codecs.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
ffmpeg-devices.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
ffmpeg-filters.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
ffmpeg-formats.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
ffmpeg-protocols.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
ffmpeg-resampler.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
ffmpeg-scaler.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
ffmpeg-utils.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
ffmpeg.texi doc/ffmpeg: Document device selection for Vulkan 2020-02-09 20:36:45 +00:00
ffmpeg.txt
ffplay.texi ffplay: added option always on top for video window 2019-05-20 17:51:43 -03:00
ffprobe.texi doc/ffprobe: fix typo and update URL in man 2019-02-09 20:01:18 +01:00
ffprobe.xsd fftools/ffprobe: Add S12M Timecode output as side data (such as SEI TC) 2019-05-27 00:28:34 +02:00
fftools-common-opts.texi avutil/log: drop support for NO_COLOR environment variable 2020-02-09 20:31:44 +01:00
filter_design.txt doc: update filter_design.txt. 2017-09-12 11:03:51 +02:00
filters.texi avfilter/vf_xmedian: implement percentile option 2020-02-12 14:59:32 +01:00
formats.texi avformat: Add max_probe_packets option 2019-11-03 11:52:32 +01:00
general.texi avcodec: add decoder for argonaut games' adpcm codec 2020-01-26 10:23:54 +01:00
git-howto.texi Merge commit '41ed7ab45f' 2016-06-21 21:55:34 +02:00
indevs.texi avdevice/decklink: deprecate the -list_devices option 2020-01-03 18:13:22 +01:00
issue_tracker.txt Remove the ffserver program 2018-01-06 18:31:37 +00:00
lexicon doc: add a lexicon 2017-02-03 15:03:44 +01:00
libav-merge.txt doc/libav-merge: add a line about the previous skipped merge 2019-02-20 13:51:19 -03:00
libavcodec.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
libavdevice.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
libavfilter.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
libavformat.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
libavutil.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
libswresample.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
libswscale.texi Remove the ffserver program 2018-01-06 18:31:37 +00:00
mailing-list-faq.texi doc/mailing-list-faq: auto unsubscribe due to DMARC 2019-04-20 13:55:39 -08:00
Makefile doc: Add mailing list FAQ 2017-10-03 15:25:07 -08:00
metadata.texi doc/metadata: fix error in timebase description 2018-12-14 12:57:34 +01:00
mips.txt
multithreading.txt
muxers.texi avformat/dashenc: use AV_OPT_TYPE_DICT for http_opts 2020-02-03 21:42:35 +01:00
nut.texi Merge commit '41ed7ab45f' 2016-06-21 21:55:34 +02:00
optimization.txt build: Prefer NASM assembler over YASM 2017-06-21 17:00:30 -03:00
outdevs.texi doc/outdevs: Mention "sdl2" alias for "sdl". 2020-01-26 13:15:07 +01:00
patchwork doc/patchwork: Document the patchwork states 2016-10-26 19:46:00 +02:00
platform.texi configure: error out on unsupported MSVC versions 2018-05-18 02:22:57 +01:00
print_options.c Merge commit '2025d37871' 2017-03-29 15:20:10 +02:00
protocols.texi avformat/udp: increase the default buffer size of a receiving socket to 384K 2020-01-25 23:16:47 +01:00
rate_distortion.txt
resampler.texi swresample/options: enable linear_interp and exact_rational by default 2017-03-17 00:08:03 +07:00
scaler.texi doc/swscaler: explain default Lanczos parameter 2019-05-27 21:32:33 +05:30
snow.txt doc/snow: fix typos 2019-02-10 16:46:56 +01:00
style.min.css
swresample.txt
swscale.txt cosmetics: Fix spelling mistakes 2016-05-04 18:16:21 +02:00
t2h.init doc/t2h: use container 2016-10-03 00:16:27 +01:00
t2h.pm doc/t2h: use container 2016-10-03 00:16:27 +01:00
tablegen.txt
texi2pod.pl doc: escape left brace in texi2pod.pl regex 2016-07-10 13:34:57 +02:00
texidep.pl
undefined.txt doc: Add initial documentation explaining undefined behavior and SUINT 2017-07-21 17:37:05 +02:00
utils.texi doc/utils: add hexadecagonal channel layout 2019-10-19 13:00:36 +05:30
writing_filters.txt doc/writing_filters: Use ff_filter_get_nb_threads() get number of threads 2019-05-22 17:43:41 +08:00