support old sipr in rm

[Carl Eugen Hoyos]

(issue 1708)
​http://samples.ffmpeg.org/real/RA/sipr/
Works fine with mplayer -demuxer rm -ac ffsipr, does not work correctly with ffmpeg and mplayer -demuxer lavf

$ ffmpeg -i big_16k.ra
ffmpeg version N-42619-g6b7849e Copyright (c) 2000-2012 the FFmpeg developers
  built on Jul 19 2012 08:58:35 with gcc 4.3.2
  configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl --enable-libopenjpeg --enable-libvorbis --enable-libspeex --enable-libmp3lame --enable-libtheora --extra-ldflags=-lm --enable-libvpx --enable-libxavs --enable-x11grab --enable-libass
  libavutil      51. 65.100 / 51. 65.100
  libavcodec     54. 41.100 / 54. 41.100
  libavformat    54. 17.100 / 54. 17.100
  libavdevice    54.  1.100 / 54.  1.100
  libavfilter     3.  2.100 /  3.  2.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[rm @ 0x90764e0] max_analyze_duration 5000000 reached at 5000000
[rm @ 0x90764e0] Estimating duration from bitrate, this may be inaccurate
Guessed Channel Layout for  Input Stream #0.0 : mono
Input #0, rm, from 'big_16k.ra':
  Metadata:
    title           : >
    author          :
    copyright       :
    comment         : ??D
  Duration: N/A, bitrate: N/A
    Stream #0:0: Audio: sipr (sipr / 0x72706973), 16000 Hz, mono, flt
At least one output file must be specified

[compn]

these sipr samples work fine:
​http://samples.ffmpeg.org/real/AC-sipr/

the samples in

​http://samples.ffmpeg.org/real/RA/sipr/

are using an older format:
[07:16] <kshishkov> I suspect it's because big* files are in really old format
[07:17] <kshishkov> and they have Int0 interleaver instead of (expected) "sipr" interleaver

a rewrite of rm demuxer maybe useful.

[ami_stuff]

at least RealAudio Encoder 3.1 (1997) produces such files

[ami_stuff]

Attached hack fixes the problem.

[Carl Eugen Hoyos]

Could your patch break ATRAC decoding?

[ami_stuff]

yes it breaks atrac3 in version 5 cointainer:

​http://www.datafilehost.com/download-d27069ba.html

[Carl Eugen Hoyos]

Could you test attached patch?

[ami_stuff]

Replying to cehoyos:

Could you test attached patch?

Works fine with my samples.

[Carl Eugen Hoyos]

Thank you for testing!