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362 Commits

Author SHA1 Message Date
Mans Rullgard
633ddb8519 ac3dec: use get_sbits() instead of manually sign-extending 
Signed-off-by: Mans Rullgard <mans@mansr.com>
 2011-10-09 23:21:31 +01:00
Anton Khirnov
a4ea00d021 lavc/lavf: use unique private classes. 
This is needed by the new AVOptions API.
 2011-10-05 07:52:30 +02:00
Anton Khirnov
feedc0754b ac3dec: actually use drc_scale private option 2011-09-21 13:51:53 +02:00
Reimar Döffinger
459fe331e9 ac3dec: avoid pointless alloc and indirection for input_buffer 
Since we now always allocate it, it can simply be made part of the context
instead.
 2011-09-06 12:43:16 -04:00
Anton Khirnov
9b83919f44 ac3dec: add a drc_scale private option 
Deprecate corresponding AVCodecContext option.

This is the first test of decoder private options.
 2011-07-10 17:07:12 +02:00
Justin Ruggles
e6c52cee54 Replace usages of av_get_bits_per_sample_fmt() with av_get_bytes_per_sample(). 
av_get_bits_per_sample_fmt() is deprecated.
 2011-06-20 18:56:06 -04:00
Justin Ruggles
9aa8193a23 Add floating-point sample format support to the ac3, eac3, dca, aac, and vorbis 
decoders.

Based on patches by clsid2 in ffdshow-tryout.
 2011-05-18 17:27:06 -04:00
Justin Ruggles
4c64c8e95a ac3dec: fix processing of delta bit allocation information. 
The number of dba segments is the coded value + 1.
The coupling dba offset starts at the first coupling band, not at zero.
 2011-04-17 12:33:41 -04:00
Mans Rullgard
6d9f52b2cd ac3: move ff_ac3_bit_alloc_calc_bap to ac3dsp 
Signed-off-by: Mans Rullgard <mans@mansr.com>
 2011-03-29 19:31:45 +01:00
Justin Ruggles
991f3de1bb ac3enc: Add codec-specific options for writing AC-3 metadata. 2011-03-27 11:30:09 -04:00
Justin Ruggles
be18738801 Get audio_service_type for AC-3 based on bitstream mode in the AC-3 parser 
and decoder, and vice-versa for the AC-3 encoder.
 2011-03-25 16:59:00 -04:00
Reimar Döffinger
4c886d613d Detect byte-swapped AC-3 and support decoding it directly. 
This allows the AC-3 decoder to be used directly with RealMedia
decoders that unlike the libavformat one do not byte-swap automatically.
Since the new code is only used in case we would fail directly otherwise
there should be no risk for regressions.
 2011-03-22 15:36:47 -04:00
Justin Ruggles
40728b5169 cosmetics: indentation 2011-03-22 15:36:47 -04:00
Justin Ruggles
67fc8652b9 Always copy input data for AC3 decoder. 
Depending on error_recognition is not correct, low values do
certainly not mean it is ok to crash.

Based on a patch by Reimar Döffinger <Reimar.Doeffinger@gmx.de>
 2011-03-22 15:36:47 -04:00
Mans Rullgard
a45fbda994 Move ff_kbd_window_init() to a separate file 
This function is not tightly coupled to mdct, and it's in the way
of making a fixed-point mdct implementation.

Signed-off-by: Mans Rullgard <mans@mansr.com>
 2011-03-19 19:49:27 +00:00
Mans Rullgard
26f548bb59 fft: remove inline wrappers for function pointers 
This removes the rather pointless wrappers (one not even inline)
for calling the fft_calc and related function pointers.

Signed-off-by: Mans Rullgard <mans@mansr.com>
 2011-03-19 19:49:18 +00:00
Mans Rullgard
2912e87a6c Replace FFmpeg with Libav in licence headers 
Signed-off-by: Mans Rullgard <mans@mansr.com>
 2011-03-19 13:33:20 +00:00
Justin Ruggles
c73d99e672 Separate format conversion DSP functions from DSPContext. 
This will be beneficial for use with the audio conversion API without
requiring it to depend on all of dsputil.

Signed-off-by: Mans Rullgard <mans@mansr.com>
 2011-02-02 02:44:53 +00:00
Justin Ruggles
80ba1ddb58 Remove unneeded add bias from 3 functions. 
DSPContext.vector_fmul_window()
DCADSPContext.lfe_fir()
SynthFilterContext.synth_filter_float()

Signed-off-by: Mans Rullgard <mans@mansr.com>
 2011-01-31 20:28:42 +00:00
Justin Ruggles
b5ec638343 cosmetics: indentation and spacing 2011-01-28 00:21:46 +00:00
Justin Ruggles
9d06d7bce3 Remove the add bias hack for the C version of DSPContext.float_to_int16_*(). 2011-01-28 00:07:35 +00:00
Diego Elio Pettenò
d36beb3f69 Add ff_ prefix to data symbols of encoders, decoders, hwaccel, parsers, bsf. 
None of these symbols should be accessed directly, so declare them as
hidden.

Signed-off-by: Mans Rullgard <mans@mansr.com>
 2011-01-26 16:08:45 +00:00
Justin Ruggles
4c57cde942 Add ff_ prefix to ac3_common_init(). 
Signed-off-by: Mans Rullgard <mans@mansr.com>
 2011-01-26 15:35:27 +00:00
Stefano Sabatini
5d6e4c160a Replace deprecated symbols SAMPLE_FMT_* with AV_SAMPLE_FMT_*, and enum 
SampleFormat with AVSampleFormat.

Originally committed as revision 25730 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2010-11-12 11:04:40 +00:00
Carl Eugen Hoyos
eb0a4d3222 Fix compilation of AC3 decoder if E-AC3 decoder was disabled. 
Originally committed as revision 23131 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2010-05-13 20:41:36 +00:00
Justin Ruggles
cc8538ff93 ac3dec: return smaller of buf_size and frame_size instead of always returning 
frame_size.

Originally committed as revision 22950 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2010-04-22 21:43:36 +00:00
Stefano Sabatini
2874c81cc8 Replace all remaining occurrences of AVERROR_NOMEM with 
AVERROR(ENOMEM).

AVERROR_NOMEM is deprecated and will be dropped at the next libavutil
major bump.

Originally committed as revision 22791 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2010-04-03 14:15:00 +00:00
Stefano Sabatini
72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which 
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2010-03-30 23:30:55 +00:00
Carl Eugen Hoyos
ca6e7708b4 Add spectral extension to the E-AC-3 decoder. 
Original patch by Justin, updated and resubmitted by
Christophe Gisquet, christophe D gisquet A gmail

Originally committed as revision 22734 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2010-03-30 22:09:14 +00:00
Justin Ruggles
2c2cdc0bfb Simplify error handling by processing header errors separate from CRC and 
buffer size vs. frame size errors.

Originally committed as revision 21519 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2010-01-28 23:19:33 +00:00
Justin Ruggles
008f872f61 Only check frame size if the header is valid. 
Originally committed as revision 21439 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2010-01-24 23:55:33 +00:00
Reimar Döffinger
1460c79097 Use MULH instead of 64x64 multiplication, around 5% overall speedup on Intel Atom. 
Patch by myself and Yuriy Kaminskiy [yumkam mail ru]

Originally committed as revision 21175 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2010-01-12 23:02:07 +00:00
Justin Ruggles
7934cbb3be ac3dec: apply dynamic range compression to correct channels in dual-mono mode. 
Originally committed as revision 20533 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-11-14 00:25:48 +00:00
Justin Ruggles
187bc061e4 ac3dec: revert r20089. The change was just wrong. 10l for me. 
Originally committed as revision 20473 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-11-08 03:06:05 +00:00
Justin Ruggles
535497f193 Change an error to a warning to support broken AC-3 files known to exist. 
Fixes Issue 1426.

Originally committed as revision 20110 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-10-01 00:06:54 +00:00
Justin Ruggles
3fdccca091 10l: wrong operation in stereo rematrixing 
Originally committed as revision 20106 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-09-30 21:51:02 +00:00
Justin Ruggles
2ed4439658 Simplify stereo rematrixing by only using one temporary variable. It is also 
about 1.8% faster on my system.

Originally committed as revision 20090 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-09-30 01:25:04 +00:00
Justin Ruggles
16c91d2b23 remove unneeded assignment in inner loop. rematrixing bands are contiguous. 
Originally committed as revision 20089 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-09-30 01:09:57 +00:00
Justin Ruggles
8b11b44ea7 Rearrange loop structure for approx. 35-50% faster calc_transform_coeffs_cpl() 
depending on content.

Originally committed as revision 20055 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-09-27 07:16:51 +00:00
Justin Ruggles
3b6c5ad2f6 Move variable declaration to inside of loop. 
Originally committed as revision 20053 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-09-27 06:38:57 +00:00
Justin Ruggles
025873738f Cosmetics: Rename some variables. 
Originally committed as revision 20052 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-09-27 06:38:13 +00:00
Justin Ruggles
b5f4639b13 Simplify coupling band loop. 
Originally committed as revision 20051 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-09-27 06:33:23 +00:00
Justin Ruggles
a521aadfe8 cosmetics: reindent after last commit 
Originally committed as revision 19589 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-08-05 02:31:13 +00:00
Justin Ruggles
25dcd1823c ac3dec: simplify zero-bit mantissa dithering by calculating it 
conditionally during mantissa decoding, then only removing it from the
coupling range for coupled channels which do not use dithering.

Originally committed as revision 19588 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-08-05 02:30:34 +00:00
Justin Ruggles
b972c06a8f cosmetics: indentation and line wrap 
Originally committed as revision 19587 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-08-05 01:58:28 +00:00
Justin Ruggles
c36ea0600c cosmetics after last commit 
Originally committed as revision 19586 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-08-05 01:14:28 +00:00
Justin Ruggles
3f93716809 Modify decode_band_structure() so that the actual band structure is only 
used within the function.  This removes the need to have the coupling band
structure stored in the AC3DecodeContext.

Originally committed as revision 19585 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-08-05 01:13:42 +00:00
Justin Ruggles
603139022d Use coupling band sizes instead of coupling band structure when 
calculating coupling transform coefficients.

Originally committed as revision 19584 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-08-05 01:00:41 +00:00
Justin Ruggles
eb98cdfa8d cosmetics: add more detailed information to the documentation for 
decode_band_structure().

Originally committed as revision 19577 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-08-03 22:05:31 +00:00
Diego Biurrun
d15153244f refactoring: properly separate AC-3 and E-AC-3 code 
Originally committed as revision 19501 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-07-23 02:33:25 +00:00
Diego Biurrun
89547cfb36 Make sure that eac3_decoder only gets enabled when CONFIG_EAC3_DECODER is set. 
Originally committed as revision 19500 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-07-23 00:15:23 +00:00
Ronald S. Bultje
ce863d7f36 Rename ff_log_missing_feature() to av_log_missing_feature(). 
Originally committed as revision 19294 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-06-29 19:07:04 +00:00
Justin Ruggles
ae04de316f eac3dec: revert commit r18860. keep the AHT IDCT 24-bit. will make AHT GAQ 
dequantization 24-bit in a separate commit.

Originally committed as revision 18887 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-05-21 00:09:23 +00:00
Diego Biurrun
1754fe4d30 The AC-3 decoder is now LGPL. Exchange the license header and change references 
in the build system and documentation that mark it as GPL.

Originally committed as revision 18876 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-05-19 22:58:09 +00:00
Jason Garrett-Glaser
d869a460db LGPL version of ac3_decode_transform_coeffs_ch, ~12.4% faster. 
Originally committed as revision 18875 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-05-19 21:29:21 +00:00
Justin Ruggles
9a7a71ed4c eac3dec: use 16-bit pre-mantissas instead of 24-bit in AHT decoding. it is 
simpler and also fixes a bug in GAQ dequantization.

Originally committed as revision 18860 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-05-17 06:53:24 +00:00
Justin Ruggles
1ac7d1ac50 ac3dec: fix coupling range check. the start subband must be less than 
the end subband.

Originally committed as revision 18857 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-05-16 17:02:44 +00:00
Siarhei Siamashka
7d485f165f Support for getting (i)MDCT output multiplied by a constant scaling factor. 
Scaling (i)MDCT output has no runtime overhead and can be used to improve
performance of audio codecs. All the changes are only needed in
'ff_mdct_init' function and slow down initialization a bit.

Originally committed as revision 18855 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-05-16 14:17:08 +00:00
Justin Ruggles
778bc09bbe cosmetics: line wrap and vertical alignment 
Originally committed as revision 18752 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-05-06 01:48:14 +00:00
Justin Ruggles
396b73c7f7 ac3dec: Remove unneeded context variable, num_cpl_subbands. It is also 
not needed for spectral extension or enhanced coupling since it is
redundant information, so I am removing it from decode_band_structure()
as well.

Originally committed as revision 18751 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-05-06 01:47:34 +00:00
Justin Ruggles
52dc3fc83d cosmetics: indentation after last commit 
Originally committed as revision 18750 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-05-05 23:39:10 +00:00
Justin Ruggles
13ec942869 ac3dec: move channel remapping to outside of block loop 
Originally committed as revision 18749 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-05-05 23:38:12 +00:00
Justin Ruggles
bfeca7beb6 Add channel layout support to the AC-3 decoder and AC-3 parser. 
Originally committed as revision 18622 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-04-19 15:05:32 +00:00
Justin Ruggles
95f3019a51 ac3dec: reorder output channels to SMPTE channel order 
Originally committed as revision 18542 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-04-17 08:43:04 +00:00
Thilo Borgmann
7a00bbad21 Implement avcodec_decode_video2(), _audio3() and _subtitle2() which takes an 
AVPacket argument rather than a const uint8_t *buf + int buf_size. This allows
passing of packet-specific flags from demuxer to decoder, such as the keyframe
flag, which appears necessary to playback corePNG P-frames.

Patch by Thilo Borgmann thilo.borgmann googlemail com, see also the thread
"Google Summer of Code participation" on the mailinglist.

Originally committed as revision 18351 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-04-07 15:59:50 +00:00
Diego Biurrun
406792e7b0 cosmetics: Remove pointless period after copyright statement non-sentences. 
Originally committed as revision 16684 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-01-19 15:46:40 +00:00
Alex Converse
11d6f38cc9 Factorise enum of AC3 error types to be usable by AAC in the ADTS patch that 
will follow

Patch by Alex Converse ( alex converse gmail com )

Originally committed as revision 16479 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2009-01-07 18:10:10 +00:00
Stefano Sabatini
dbbec0c2f2 Make av_log_missing_feature an internal function, and change its name 
to ff_log_missing_feature.

Originally committed as revision 16037 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-12-08 21:21:38 +00:00
Justin Ruggles
20e047262f cosmetics: alignment after last commit 
Originally committed as revision 16035 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-12-08 03:15:10 +00:00
Justin Ruggles
72a6244b5d ac3: detect dba errors and prevent writing past end of array 
Originally committed as revision 16034 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-12-08 03:13:20 +00:00
Justin Ruggles
2ceccf045c ac3dec: simplify exponent bounds checking 
Originally committed as revision 16022 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-12-06 16:33:16 +00:00
Justin Ruggles
96f229d6c0 ac3dec: unroll inner loop in exponent decoding. 46% faster decode_exponents(). 
Originally committed as revision 16018 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-12-06 15:46:23 +00:00
Justin Ruggles
806703243e cosmetics: vertical alignment 
Originally committed as revision 16017 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-12-06 15:38:21 +00:00
Justin Ruggles
1cdd567f31 cosmetics: reindent after last commit 
Originally committed as revision 16016 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-12-06 15:37:04 +00:00
Justin Ruggles
ce7d842fa6 ac3dec: detect out-of-range exponents 
Originally committed as revision 16015 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-12-06 15:36:23 +00:00
Justin Ruggles
f23dc1e1f9 silence gcc warning: ‘n_bands’ may be used uninitialized 
Originally committed as revision 15999 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-12-04 02:56:25 +00:00
Justin Ruggles
75b53b2123 ac3dec: use uint8_t for band sizes 
Originally committed as revision 15998 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-12-04 02:51:39 +00:00
Justin Ruggles
af2272b209 ac3dec: skip decoding and use error concealment for remaining blocks in 
the frame after an error occurs.

Originally committed as revision 15987 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-12-03 03:34:31 +00:00
Justin Ruggles
e202cc2580 revert r15812 (E-AC-3 Spectral Extension) pending further review 
Originally committed as revision 15818 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-11-13 22:38:38 +00:00
Justin Ruggles
3f3ca7ac07 cosmetics: vertical alignment 
Originally committed as revision 15815 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-11-13 03:18:28 +00:00
Justin Ruggles
c763f86728 silence a gcc warning about using an uninitialized variable 
Originally committed as revision 15814 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-11-13 03:18:24 +00:00
Justin Ruggles
66561189a1 cosmetics: indentation 
Originally committed as revision 15813 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-11-13 03:18:18 +00:00
Justin Ruggles
0cc51734b2 add support for spectral extension 
Originally committed as revision 15812 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-11-13 03:18:13 +00:00
Justin Ruggles
0c5d750df9 add a generic function to decode banding structure for coupling, spectral 
extension, or enhanced coupling

Originally committed as revision 15811 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-11-13 03:18:07 +00:00
Justin Ruggles
6c6f927289 add a line break in error message text 
Originally committed as revision 15810 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-11-13 03:18:01 +00:00
Justin Ruggles
6ee6d068f7 simplify decoding of coupling frequency range 
Originally committed as revision 15809 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-11-13 03:17:56 +00:00
Justin Ruggles
24834c1928 cosmetics: rename two variables 
Originally committed as revision 15808 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-11-13 03:17:50 +00:00
Michael Niedermayer
047599a4ba Rename error_resilience to error_recognition. 
Originally committed as revision 15270 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-09-08 18:18:49 +00:00
Justin Ruggles
2988c93d94 create a separate codec_id for E-AC-3 
Originally committed as revision 15143 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-09-01 14:33:54 +00:00
Justin Ruggles
1f6a594de4 turn on E-AC-3 decoding support and update the Changelog 
Originally committed as revision 15103 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-08-31 03:08:18 +00:00
Justin Ruggles
f2e4eb62dc cosmetics: indentation 
Originally committed as revision 15089 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-08-31 02:32:08 +00:00
Justin Ruggles
8dfc56ec32 commit more OKed parts of the E-AC-3 decoder 
Originally committed as revision 15087 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-08-31 02:30:09 +00:00
Justin Ruggles
225c30429d commit more OKed parts of the E-AC-3 decoder 
Originally committed as revision 15068 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-08-30 23:19:23 +00:00
Justin Ruggles
ea364c74a0 cosmetics: update comment about dithering 
Originally committed as revision 15051 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-08-30 17:51:03 +00:00
Justin Ruggles
e522bd49c8 cosmetics: change another "get" to "decode" 
Originally committed as revision 15014 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-08-29 00:09:47 +00:00
Justin Ruggles
164e169fef cosmetics: change "get" to "decode" 
Originally committed as revision 15013 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-08-29 00:06:43 +00:00
Justin Ruggles
86662b1c89 cosmetics: indentation 
Originally committed as revision 15012 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-08-28 23:16:21 +00:00
Justin Ruggles
260e09305b remove unneeded variable, dither_all 
Originally committed as revision 15011 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-08-28 23:04:15 +00:00
Justin Ruggles
aec0407faf cosmetics: indent after last commit 
Originally committed as revision 15001 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-08-27 23:23:54 +00:00
Justin Ruggles
6b4bfed965 do not read exponent strategies from each block for E-AC-3 since they are in the header 
Originally committed as revision 15000 to svn://svn.ffmpeg.org/ffmpeg/trunk
 2008-08-27 23:11:05 +00:00