On 1/30/17, bananaman...@gmail.com <bananaman...@gmail.com> wrote: > From: bnnm <bananaman...@gmail.com> > > Multichannel joint stereo simply interleaves stereo pairs (6ch: 2ch + 2ch + > 2ch), so each pair is decoded separatedly. > > *** > > To test my changes, I converted examples to wav with ffmpeg.exe (old and > new), and compared them to see they are byte-exact. > > Regular 2ch files (JS and normal) were straightforward to test. > > For multichannel, to check each JS pair is correctly decoded separatedly I > did: > - manually demux 6ch.msf into 3 pairs and convert them (2ch_1.wav + > 2ch_2.wav + 2ch_3.wav) > - convert the 6ch.msf file to wav (with my changes) > - manually demux the 6ch.wav into 3 pairs (6ch_d1.wav + 6ch_d2.wav + > 6ch_d3.wav) > - compare each pair (ex. 2ch_3.wav vs 6ch_d3.wav): all pairs are byte-exact. > > The new code just processes each JS pair separatedly, there are no algorithm > changes. > It could be improved a bit but I'm not sure about typical styles. > I've only seen 6ch .MSF (probably the AT3 spec only supports 2ch audio). > > Signed-off-by: bnnm <bananaman...@gmail.com> > --- > libavcodec/atrac3.c | 160 > ++++++++++++++++++++++++++++++---------------------- > 1 file changed, 91 insertions(+), 69 deletions(-) >
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