support 2/3/5bit IMA ADPCM

[ami_stuff]

(issue 1598)

C:\>ffmpeg -i IMAADPCM_2bits.wav
ffmpeg version N-34318-g8475ec1, Copyright (c) 2000-2011 the FFmpeg developers
  built on Oct 31 2011 17:50:05 with gcc 4.6.1
  configuration: --enable-gpl --enable-version3 --enable-runtime-cpudetect --ena
ble-avisynth --enable-bzlib --enable-frei0r --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --ena
ble-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --en
able-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
--enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib

  libavutil    51. 22. 0 / 51. 22. 0
  libavcodec   53. 26. 0 / 53. 26. 0
  libavformat  53. 18. 0 / 53. 18. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 45. 3 /  2. 45. 3
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0
[adpcm_ima_wav @ 020A90C0] Only 4-bit ADPCM IMA WAV files are supported
[wav @ 020A2320] parser not found for codec adpcm_ima_wav, packets or times may
be invalid.
[adpcm_ima_wav @ 020A90C0] Only 4-bit ADPCM IMA WAV files are supported
    Last message repeated 26 times
[wav @ 020A2320] Could not find codec parameters (Audio: adpcm_ima_wav ([17][0][
0][0] / 0x0011), 44100 Hz, 2 channels, 352 kb/s)
IMAADPCM_2bits.wav: could not find codec parameters

[Elon Musk]

What created such files?

[ami_stuff]

Replying to richardpl:

What created such files?

Adobe Audition

​http://helpx.adobe.com/audition/kb/supported-file-formats-audition-3.html

[ami_stuff]

more info (see attached jpg)

[Elon Musk]

Useless, i need specification so I can know what tables are used for non 4-bit cases. And I'm not going to hunt for big applications that can encode/decode such files. So something small as dll that does actual decoding or even better specification is required.

[ami_stuff]

here is some info about IMA 3bit

​https://icculus.org/SDL_sound/downloads/external_documentation/wavecomp.htm

[ami_stuff]

​http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/Docs/RIFFNEW.pdf

[ami_stuff]

​http://www.gnu-darwin.org/www001/ports-1.5a-CURRENT/shells/bush/work/bush-1.0.3/src/ADAVOX-0.51/wc/wc-streams-codec.adb

[Elon Musk]

The last one is most useful. Could you also upload mono files (created with same tool)?

[ami_stuff]

Replying to richardpl:

Could you also upload mono files (created with same tool)?

Attached.

[Elon Musk]

I can't accept rar. Please use somthing more sane like xz/zip-7/gz/bzip

[ami_stuff]

Replying to richardpl:

I can't accept rar. Please use somthing more sane like xz/zip-7/gz/bzip

I'm not sure what does it mean? You don't like rar archive or what? UnRAR is available for linux and AFAICT p7zip can decompress it as well.

[Elon Musk]

I do not have it installed and do not want to install it, because it is not free.

[Elon Musk]

the stereo samples are really strange - layout does not match 4bit case.

[Elon Musk]

Mono files plays fine, for stereo only 2bit and others appears to be incorrectly encoded.

[ami_stuff]

Replying to richardpl:

Mono files plays fine, for stereo only 2bit and others appears to be incorrectly encoded.

attached stereo 3/5bit files plays fine in Cool Edit Pro, would be nice to support this as well ;)

[ami_stuff]

attached decoding output from (2bit/3bit):

​http://www.fmjsoft.com/awavestudio.html

in case it will help in anything

at least with this software there is no noise in 3bit mode

[Elon Musk]

But output is incorrect...

[ami_stuff]

Yes, but the same happens with mono files, so there is a bug in decoder (it supports 100% correctly only 4-bit mode) - at least it proves that 3bit stereo sample could be decoded not only by cool edit/audition.

here is the mono output:

​https://www.datafilehost.com/d/4b69a339

I can upload 36kb dvi plugin from cool edit if you want to investigate this issue.

[ami_stuff]

here is the output in 7z, shouldn't do too many things at once

​https://www.datafilehost.com/d/5bfb0a59

[Elon Musk]

Not interested, I already lost too much time on this, who knows how cool edit/audition stores samples into bitstream.

[Elon Musk]

You could check if rockbox decodes stereo 3bit and 5bit files OK.

[ami_stuff]

There is a mention of IMA 3bit here, but I don't know how to test it:

​https://fossies.org/dox/oss-v4.2-build2011-src-gpl/ossplay_8h_source.html (AFMT_MS_IMA_ADPCM_3BITS)

Here is Cool Edit manual (DVI/IMA ADPCM):

​http://dmt.zjlsedu.org/longresty/301/040/050/L000000000122370.pdf

and I found also this:

​https://www.powerdeveloper.org/blog/grzegorz%20kraszewski/did-i-write-something-about-adpcm

[ami_stuff]

Vox Studio can converrt 3bit stereo sample as well (IMAADPCM_3bits.wav), unfortunately no source code of conversion dll.

​http://www.xentec.be/download/download.html

"Download the documentation which describes the calling syntax for the file conversion DLL built into Vox Studio since version 3.0. This also contains a program example. This is for experienced programmers only."

​http://www.xentec.be/download/vcdlldoc.zip

It can also save 3bit IMA ADPCM, but only mono AFAICT.

[Elon Musk]

Fixed already in master.

[ami_stuff]

thx :)