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323 Commits

Author SHA1 Message Date
Justin Ruggles
2816d32310 cosmetics: indentation 
Originally committed as revision 11416 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-01-05 15:23:39 +00:00
Justin Ruggles
95283c1701 check for request_channels at codec init 
Originally committed as revision 11415 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-01-05 15:22:53 +00:00
Aurelien Jacobs
3abe5fbdc4 improve CRC API 
- don't export any global var
 - provide either generated or hardcoded tables

Originally committed as revision 11409 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-01-04 23:09:58 +00:00
Justin Ruggles
7564658bbc cosmetics: indentation and add a TODO comment 
Originally committed as revision 11389 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-01-04 00:39:03 +00:00
Justin Ruggles
471db688c6 only check ac3 crc if AVCodecContext.error_resilience > 0 
Originally committed as revision 11388 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-01-03 23:05:53 +00:00
Justin Ruggles
d6939960d5 add crc check to ac3 decoder 
Originally committed as revision 11379 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-01-03 02:26:29 +00:00
Justin Ruggles
12eaa3b760 simplify 
Originally committed as revision 11360 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-30 22:58:20 +00:00
Justin Ruggles
b35c67e58b pass an AC3DecodeContext to ac3_downmix() instead of multiple arguments 
Originally committed as revision 11359 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-30 22:28:17 +00:00
Justin Ruggles
866181e5e8 cosmetics: rename sampling_rate to sample_rate 
Originally committed as revision 11358 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-30 21:26:30 +00:00
Justin Ruggles
0345fade94 do not need to cast a (void *) 
Originally committed as revision 11357 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-30 21:24:49 +00:00
Justin Ruggles
1b70d88b7a cosmetics: vertical realignment after last commit 
Originally committed as revision 11356 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-30 21:09:08 +00:00
Justin Ruggles
d802d7ca12 cosmetics: rename all AC3DecodeContext variables from ctx to s 
Originally committed as revision 11355 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-30 20:58:50 +00:00
Justin Ruggles
23c8cb89c9 cosmetics: rename GetBitContext gb to gbc 
Originally committed as revision 11354 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-30 20:47:22 +00:00
Justin Ruggles
005ab694ae remove unused context variable 
Originally committed as revision 11353 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-30 03:10:18 +00:00
Justin Ruggles
1408352ada Add option for user to scale the amount of dynamic range compression which is 
applied by the audio decoder, and use that option in the AC3 decoder.

Originally committed as revision 11280 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-20 00:55:08 +00:00
Justin Ruggles
03726b7042 Skip dialog normalization. It shouldn't be used by the decoder, and there is 
not currently a clean way to pass the value to the user.

Originally committed as revision 11246 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-17 01:09:00 +00:00
Justin Ruggles
224bc440b2 Revert commit made in revision 11228. I'm getting some strange results in the 
downmixed output that I can't quite figure out.

Originally committed as revision 11245 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-17 01:03:19 +00:00
Justin Ruggles
b40211ff67 downmix before the IMDCT if no block switching is used 
Originally committed as revision 11228 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-16 04:25:50 +00:00
Andreas Öman
6708eefe55 Make AC3 decoder honor avctx->request_channels 
Originally committed as revision 11220 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-15 07:00:19 +00:00
Justin Ruggles
e2270b4e1e cosmetics: rename ac3 decoder variables 
Originally committed as revision 11197 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-09 03:28:10 +00:00
Justin Ruggles
e59cc20593 cosmetics: rename common ac3 variables 
Originally committed as revision 11196 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-09 03:27:14 +00:00
Justin Ruggles
5ce2134258 cosmetics: rename ac3 bit allocation variables 
Originally committed as revision 11194 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-09 03:23:04 +00:00
Justin Ruggles
66ecf18e38 cosmetics: rename ac3 tables 
Originally committed as revision 11193 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-09 03:21:33 +00:00
Diego Biurrun
56cc85a068 Misc spelling fixes, prefer American over British English. 
Originally committed as revision 11126 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-12-02 15:43:08 +00:00
Justin Ruggles
a135bea507 skip incomplete frames 
Originally committed as revision 10497 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-09-15 02:44:28 +00:00
Justin Ruggles
3df880934e better AC3 header error reporting 
Originally committed as revision 10496 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-09-15 02:41:24 +00:00
Justin Ruggles
d5b7144e1f fix random dithering of zero-bit mantissas 
Originally committed as revision 10495 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-09-15 00:43:40 +00:00
Justin Ruggles
bfcf690c68 cosmetics: rename variables. tbl->tab for consistency with other AC3 tables 
Originally committed as revision 10494 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-09-15 00:19:21 +00:00
Justin Ruggles
396a6ee50e fix decoding of DolbyNet AC3 
Originally committed as revision 10493 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-09-15 00:00:57 +00:00
Justin Ruggles
222ae64c3d cosmetics: vertical alignment 
Originally committed as revision 10002 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-09 00:39:35 +00:00
Justin Ruggles
5066f51502 comments modification: add, clean up, Doxygenize, and reword 
Originally committed as revision 10001 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-09 00:36:49 +00:00
Justin Ruggles
f5cefb21d5 cosmetics: blank lines, remove some comments 
Originally committed as revision 9955 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-05 21:48:46 +00:00
Justin Ruggles
82758fd690 add pointer to the parent context for use with av_log() 
Originally committed as revision 9954 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-05 21:34:33 +00:00
Justin Ruggles
77416325cb use array for dynamic range scaling factors 
Originally committed as revision 9953 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-05 21:10:09 +00:00
Justin Ruggles
01f354531d add dialogue normalization 
Originally committed as revision 9948 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-05 19:36:35 +00:00
Justin Ruggles
3bbb0bf82c add support for downmixing to stereo or mono 
Originally committed as revision 9916 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 22:32:17 +00:00
Justin Ruggles
4e09232070 use dsputil for float to signed 16-bit sample conversion 
Originally committed as revision 9914 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 20:59:22 +00:00
Justin Ruggles
775369e028 cosmetics: indentation 
Originally committed as revision 9911 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 20:32:57 +00:00
Justin Ruggles
7b4076a777 consolidate decoding of lfe and coupling channels with decoding of full-bandwidth channels. 
Originally committed as revision 9910 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 19:19:48 +00:00
Justin Ruggles
5e61de0cc1 there are only 4 rematrixing bands 
Originally committed as revision 9908 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 15:01:21 +00:00
Justin Ruggles
75b9b0369b cosmetics: use more appropriate names for iterator variables. 
Originally committed as revision 9907 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 13:52:56 +00:00
Justin Ruggles
8e2eb3b674 move some variables to a more local scope. 
Originally committed as revision 9905 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 13:30:37 +00:00
Justin Ruggles
0bff58a59a make exponent decoding consistent (prepare for merging coupling and lfe code with normal channel code). 
Originally committed as revision 9904 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 13:26:46 +00:00
Justin Ruggles
eaf84d970f cosmetics: use braces when it makes the code easier to read. 
Originally committed as revision 9893 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 12:04:41 +00:00
Justin Ruggles
fc59010bbf change AC3DecodeContext variable to local variable 
Originally committed as revision 9892 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 11:55:10 +00:00
Justin Ruggles
6d96d626c6 use array instead of bitmask 
Originally committed as revision 9891 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 11:39:47 +00:00
Justin Ruggles
3357ff338b use table for converting dynamic range codes to scale factors 
Originally committed as revision 9889 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 03:27:05 +00:00
Justin Ruggles
5aefe3ebef use floating-point mantissa dequantization tables 
Originally committed as revision 9888 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 03:21:17 +00:00
Justin Ruggles
04ac5cada1 cosmetics: indentation 
Originally committed as revision 9887 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 01:14:14 +00:00
Justin Ruggles
60f07fadd3 dither zero-bit mantissas by default. remove dithering only if it's explicitly turned off. 
Originally committed as revision 9886 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 01:13:08 +00:00
Justin Ruggles
d63f6fea50 simplify coefficient decoding 
Originally committed as revision 9884 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 00:12:23 +00:00
Justin Ruggles
285bf28c67 merge decoding of coupling channel coefficients and regular channel coefficients 
Originally committed as revision 9883 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-04 00:04:17 +00:00
Justin Ruggles
d7dc7ad05c split out coupling coefficient reconstruction into a separate function 
Originally committed as revision 9882 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-03 23:53:53 +00:00
Justin Ruggles
dfd57c366f align array used in mdct. fixes segfault. 
Originally committed as revision 9848 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-08-01 01:13:58 +00:00
Justin Ruggles
8b60bbbf5b simplify stereo rematrixing 
Originally committed as revision 9824 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-29 00:58:32 +00:00
Justin Ruggles
b6acc57f88 change 2 fields from context to local variables 
Originally committed as revision 9823 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-29 00:35:30 +00:00
Justin Ruggles
8fbb368d2c BLOCK_SIZE is not used properly, just use numbers instead to avoid confusion 
Originally committed as revision 9822 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-28 20:50:25 +00:00
Justin Ruggles
7bfd22f25a remove broken downmixing. will add new implementation later. 
Originally committed as revision 9821 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-28 19:33:19 +00:00
Justin Ruggles
4611b64ec1 simplify snr offset and bit allocation 
Originally committed as revision 9784 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-24 02:08:27 +00:00
Justin Ruggles
e9a3824880 only use sized data types when necessary 
Originally committed as revision 9783 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-24 01:43:47 +00:00
Justin Ruggles
8f58a4c943 set bit allocation parameters directly instead of copying 
Originally committed as revision 9782 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-24 01:35:25 +00:00
Justin Ruggles
e2cd6686fa use enum value instead of numerical value for acmod 
Originally committed as revision 9781 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-23 22:47:49 +00:00
Justin Ruggles
bc8edb7e53 use consistent data type for exponents. needs to be int8_t to pass to bit allocation. 
Originally committed as revision 9780 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-23 22:23:37 +00:00
Justin Ruggles
878c40a137 change some bit masks to arrays 
Originally committed as revision 9779 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-23 22:16:15 +00:00
Justin Ruggles
bec37145da cosmetics: indentation 
Originally committed as revision 9774 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-21 17:03:30 +00:00
Justin Ruggles
9fc1ab722e Use shared AC-3 header parsing. Move some initializations to block parsing function. 
Originally committed as revision 9773 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-21 16:28:12 +00:00
Justin Ruggles
9ef6039043 don't need to synchronize in the decoder. the parser does that already. 
Originally committed as revision 9772 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-21 13:56:04 +00:00
Justin Ruggles
de34875c75 get rid of an ugly macro 
Originally committed as revision 9771 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-21 11:54:19 +00:00
Justin Ruggles
614e9b2424 don't need to define ALT_BITSTREAM_READER 
Originally committed as revision 9752 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-19 02:21:14 +00:00
Justin Ruggles
362664215d update license header. add copyright for myself. correct and complete the statement about liba52. 
Originally committed as revision 9751 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-19 02:16:20 +00:00
Justin Ruggles
3bb004fcda revise comment for exponent decoding function 
Originally committed as revision 9750 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-19 02:09:58 +00:00
Justin Ruggles
4415076f55 new implementation of exponent decoding 
Originally committed as revision 9749 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-19 02:04:05 +00:00
Justin Ruggles
d699d38393 cosmetics: indentation 
Originally committed as revision 9748 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-19 00:51:19 +00:00
Justin Ruggles
0ce668015f remove portions of bit allocation which are no longer needed since they are shared with the encoder 
Originally committed as revision 9747 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-19 00:50:31 +00:00
Justin Ruggles
0de73a46ff fix the 256-point MDCT 
Originally committed as revision 9685 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-15 14:47:39 +00:00
Justin Ruggles
623b79435d use shared ac3 bit allocation function 
Originally committed as revision 9684 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-15 13:53:42 +00:00
Justin Ruggles
fa67992dea no need for the decoder to have the license as a prefix 
Originally committed as revision 9682 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-15 01:38:13 +00:00
Justin Ruggles
76d357fd23 remove a debugging function and variable, and remove the commented-out code which uses them. 
Originally committed as revision 9681 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-15 01:35:46 +00:00
Justin Ruggles
a39532b0d9 ABS -> FFABS 
Originally committed as revision 9680 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-15 01:32:04 +00:00
Justin Ruggles
cc2a8443eb move some common values to ac3.h and utilize them 
Originally committed as revision 9679 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-15 01:31:09 +00:00
Justin Ruggles
cb503702ee use random number generator from libavutil 
Originally committed as revision 9678 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 23:57:05 +00:00
Justin Ruggles
9d10960194 10l to me. I accidentally removed a word. 
Originally committed as revision 9677 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 22:17:23 +00:00
Justin Ruggles
0ec2cc35f7 revise license header for simplicity and consistency 
Originally committed as revision 9676 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 18:53:56 +00:00
Justin Ruggles
283614b5fc make ac3dec.c GPL until violations are fixed 
Originally committed as revision 9674 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:07:56 +00:00
Justin Ruggles
967d397a6c AC-3 decoder, soc revision 402, Jul 14 13:45:14 2007 UTC by jbr 
merge ac3_decoder.h into ac3_decoder.c

Originally committed as revision 9673 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:06:14 +00:00
Loren Merritt
afb46fc092 AC-3 decoder, soc revision 148, Sep 28 18:38:27 2006 UTC by banan 
Enable sse imdct, patch by Loren Merrit.

Originally committed as revision 9672 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:05:39 +00:00
Justin Ruggles
de17eee70f AC-3 decoder, soc revision 109, Sep 22 22:42:54 2006 UTC by banan 
Cosmetics.

Originally committed as revision 9671 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:05:13 +00:00
Justin Ruggles
1ea76064b4 AC-3 decoder, soc revision 72, Sep 7 04:20:00 2006 UTC by cloud9 
fix short block imdct.

Originally committed as revision 9670 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:04:40 +00:00
Justin Ruggles
c7cfc48f37 AC-3 decoder, soc revision 71, Sep 4 09:47:12 2006 UTC by cloud9 
Redundant code cleanup.
Optimized dither generation.
Minor optimization in bit allocation.
Comments.

Originally committed as revision 9669 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:04:17 +00:00
Justin Ruggles
860fe8c908 AC-3 decoder, soc revision 70, Aug 31 18:04:23 2006 UTC by banan 
Cosmetics, white space removal.

Originally committed as revision 9668 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:03:47 +00:00
Justin Ruggles
6dc5d71f97 AC-3 decoder, soc revision 69, Aug 31 07:12:56 2006 UTC by cloud9 
Fix the bugs:
1. The quality of output because of incorrect windowing coefficients.
New code for window generation.

2. Dynrng values were reset where dynrng value is present in the first block,
but not in the subsequent block.

Originally committed as revision 9667 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:03:14 +00:00
Justin Ruggles
d7bcc4adcf AC-3 decoder, soc revision 58, Aug 19 14:20:45 2006 UTC by cloud9 
Further optimizations.

Originally committed as revision 9666 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:02:32 +00:00
Justin Ruggles
1d0a6f5209 AC-3 decoder, soc revision 57, Aug 19 12:44:38 2006 UTC by cloud9 
Optimization as suggested by Benjamin.

Originally committed as revision 9665 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:02:08 +00:00
Justin Ruggles
032732d49d AC-3 decoder, soc revision 56, Aug 17 14:21:58 2006 UTC by cloud9 
Acknowledgements.

Originally committed as revision 9664 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:01:44 +00:00
Justin Ruggles
e6bca37c81 AC-3 decoder, soc revision 55, Aug 17 12:25:24 2006 UTC by cloud9 
Remove more unnecessary headers.
Codec initialization changed to use name => argument notation.

Originally committed as revision 9663 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:01:14 +00:00
Justin Ruggles
3ff88ff45a AC-3 decoder, soc revision 54, Aug 17 09:13:08 2006 UTC by cloud9 
Remove unnecessary header files.

Originally committed as revision 9662 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:00:38 +00:00
Justin Ruggles
262d8702a9 AC-3 decoder, soc revision 53, Aug 17 08:53:44 2006 UTC by cloud9 
Converted the window from double to float.
Now sound produced is as good as sound produced by liba52.

Originally committed as revision 9661 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 16:00:05 +00:00
Justin Ruggles
67414da7f7 AC-3 decoder, soc revision 52, Aug 16 22:45:07 2006 UTC by cloud9 
Reset the blksw and dithflag to 0 at the begining of each block.
Otherwise blockswitching propagates over multiple frames even if
block switching is not enabled for that frame.
Also reuse rematflg.

Originally committed as revision 9660 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 15:59:25 +00:00
Justin Ruggles
45b0ed13a8 AC-3 decoder, soc revision 48, Aug 16 11:27:49 2006 UTC by cloud9 
I realized that the bug was not in the imdct routine but in the
get_transform_coeffs.
Fixed it.
Code now uses the ffmpeg's imdct routines.
All the mplayer's ac3 samples are decoded
successfully.
Also improved downmixing.
Now all the downmixing coeffcients for channels
are normalized such that the sum of coefficients
used to construct the output for single channel
never exceeds 1.0.

Originally committed as revision 9659 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 15:58:42 +00:00
Justin Ruggles
2fbbd087bb AC-3 decoder, soc revision 40, Aug 9 00:10:14 2006 UTC by cloud9 
More code cleanup.
Window is now runtime generated.
Fixed the bugs in rematrixing routine and
in Decoding AC3 Bitstreams when coupling is in use.

Still struggling to find out what affects the quality of
the produced sound. Can anybody have a look at the
imdct routines do_imdct_256 and do_imdct_512 and tell me
whether it is the correctly implemented as described in
standard.

Originally committed as revision 9658 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 15:57:51 +00:00
Justin Ruggles
98a27a8a84 AC-3 decoder, soc revision 38, Aug 7 00:03:00 2006 UTC by cloud9 
major code cleanup.
correct implementation of imdct.
implemented imdct for block switching also.
when coupling is not in use all the
ac3 streams are decoded correctly.
but when coupling is in use there is a bug.
i am currently finding the root of the bug.
if anybody can help.

Originally committed as revision 9657 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 15:56:55 +00:00
Justin Ruggles
41277578b9 AC-3 decoder, soc revision 34, Jul 18 14:27:54 2006 UTC by cloud9 
working decoder
imdct for block switching is to be implemented
various other things to do

Originally committed as revision 9656 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 15:51:00 +00:00
Justin Ruggles
6bd4660cdb AC-3 decoder, soc revision 33, Jul 17 12:13:40 2006 UTC by cloud9 
getting weired output
but its working

Originally committed as revision 9655 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 15:49:12 +00:00
Justin Ruggles
486637af8e AC-3 decoder, soc revision 32, Jul 17 09:37:32 2006 UTC by cloud9 
Latest commit.
There is no error in parsing and or recovering transform coefficients.
Double checked with ac3dec.
Getting consistent results with the bit allocation routine and transform
coefficients.
The code is able to parse valid ac3 bitstreams without error from start
to end.
I have also implemented the imdct when block switching is not enabled.
However, can anybody provide an insight into how to convert float samples to
int16_t ? lrint is of no help cuz it produces output -1, 0 or 1 whereas the
output should be between -32768 to 32767.

Originally committed as revision 9654 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 15:48:28 +00:00
Justin Ruggles
0058584580 AC-3 decoder, soc revision 31, Jul 14 23:53:28 2006 UTC by cloud9 
Removed _ from names
Removed temporary storage for the exponents
Removed ctx->samples
Now each transform coefficients are stored in audio block as an array of transform coefficients for each channel
added ctx->delay (output of later half of previous block)
added audio_block->block_output(output of this block)

I am still not able to produce the output.
I checked the code twice completely. I am not missing anything in
parsing or in bit allocation. Yet it throws error in getting transform
coefficients sometimes. Can anyone review a code of get_transform_coeffs and
help me debug it further. I think the error is in do_bit_allocation routine cuz
get_transform_coeffs is dependent on the bit allocation parameters table.

I have checked the bit allocation algorithm thoroughly and it is as defined in the
standard. Tried everything and got stuck where to go further.
Please help me.

Originally committed as revision 9653 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 15:42:15 +00:00
Justin Ruggles
1b29343731 AC-3 decoder, soc revision 26, Jul 5 04:55:15 2006 UTC by cloud9 
Mersenne Twister
Dynamic Range
Downmixing
IMDCT

Originally committed as revision 9652 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 15:41:27 +00:00
Justin Ruggles
2aa2c5c4dd AC-3 decoder, soc revision 9, Jun 14 03:52:02 2006 UTC by cloud9 
initial commit
NOTE: This and all subsequent ac3dec.c revisions from the soc repository
violate the GPL. This will be fixed after all soc revisions are imported.
This file is not compiled yet, so the license compliance of any builds in
the meantime will not be affected.

Originally committed as revision 9651 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-07-14 15:38:39 +00:00
Diego Biurrun
b7d3bfa6d3 Remove unused libac3 AC3 decoding interface. 
Originally committed as revision 7923 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2007-02-11 12:27:11 +00:00
Diego Biurrun
b78e7197a8 Change license headers to say 'FFmpeg' instead of 'this program/this library' 
and fix GPL/LGPL version mismatches.

Originally committed as revision 6577 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2006-10-07 15:30:46 +00:00
Diego Biurrun
5509bffa88 Update licensing information: The FSF changed postal address. 
Originally committed as revision 4842 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2006-01-12 22:43:26 +00:00
Diego Biurrun
bb270c0896 COSMETICS: tabs --> spaces, some prettyprinting 
Originally committed as revision 4764 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2005-12-22 01:10:11 +00:00
Diego Biurrun
115329f160 COSMETICS: Remove all trailing whitespace. 
Originally committed as revision 4749 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2005-12-17 18:14:38 +00:00
Michael Niedermayer
95ae72b7e0 Compilation fixes part 1 patch by (Arvind R. and Burkhard Plaum, plaum, ipf uni-stuttgart de) 
Originally committed as revision 4540 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2005-08-26 19:05:44 +00:00
Michael Niedermayer
53db1cae1c data_size = 0 cleanup 
Originally committed as revision 3146 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2004-05-21 14:37:16 +00:00
Michael Niedermayer
983e3246b7 per file doxy 
Originally committed as revision 1634 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2003-03-06 11:32:04 +00:00
Zdenek Kabelac
0c1a9edad4 * UINTX -> uintx_t INTX -> intx_t 
Originally committed as revision 1578 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2003-02-11 16:35:48 +00:00
Fabrice Bellard
ff4ec49e64 license/copyright change 
Originally committed as revision 599 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2002-05-25 22:45:33 +00:00
Zdenek Kabelac
076b09e9b3 * minor - slightly modified debug message 
Originally committed as revision 401 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2002-04-15 12:52:21 +00:00
Juanjo
e0d2714adc - Fixed AC3 decoding for 5:1 AC3 streams. Now when calling av_audio_decode for 
AC3 set avcodec_context->channels to the desired number channels, if the
setting is 0 AC3 decoder will set it to the channels found in the
stream.
- Changed ffmpeg to cope with the new "way" of AC3 decoding.
- ASF muxer now uses Tickers for PTS calculations.

Originally committed as revision 393 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2002-04-09 04:52:49 +00:00
Zdenek Kabelac
30b68f33aa * encoding of AC3 with more than 2 channels 
by Takashi Iwai <tiwai@suse.de>

Originally committed as revision 383 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2002-04-08 12:08:03 +00:00
Fabrice Bellard
1a56543279 win32 fixes 
Originally committed as revision 84 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2001-08-13 21:48:05 +00:00
Fabrice Bellard
d771bcae33 added CONFIG_AC3, CONFIG_MPGLIB, CONFIG_DECODERS and CONFIG_ENCODERS (Arpi: don't forget to put CONFIG_DECODERS in mplayer) 
Originally committed as revision 9 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2001-07-23 20:58:31 +00:00
Fabrice Bellard
de6d9b6404 Initial revision 
Originally committed as revision 5 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2001-07-22 14:18:56 +00:00