to a statically allocated buffer decode_buffer_0 in cook instance.

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since the MVs are in qpel res.
Patch by Andreas Oman % andreas A olebyn P nu %
Date: Jul 14, 2007 12:40 PM
Subject: [FFmpeg-devel] [PATCH] h264 mv visualization


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same md5 with a short -t dvd encoding
fixes streamcopy of dvd


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patch by mark cox   melbournemark+ffmpeg _at_ gmail.com
thread: [PATCH] Remove unessesary assignment of CODEC_ID_BMP
date: Mon, 9 Jul 2007 20:12:28 +1000


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merge ac3_decoder.h into ac3_decoder.c

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Enable sse imdct, patch by Loren Merrit.

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Cosmetics.

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fix short block imdct.

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Redundant code cleanup.
Optimized dither generation.
Minor optimization in bit allocation.
Comments.

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Cosmetics, white space removal.

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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.

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Further optimizations.

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Optimization as suggested by Benjamin.

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Acknowledgements.

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Remove more unnecessary headers.
Codec initialization changed to use name => argument notation.

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Remove unnecessary header files.

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Converted the window from double to float.
Now sound produced is as good as sound produced by liba52.

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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.

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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.

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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.

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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.

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working decoder
imdct for block switching is to be implemented
various other things to do

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getting weired output
but its working

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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.

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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)

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