Subject: Re: [ecasound] A bug in writing wave headers?
From: S. Massy (theanaloguekid@tak.net.dhis.org)
Date: Mon Dec 11 2000 - 01:12:15 EET
On Mon, 11 Dec 2000, Kai Vehmanen wrote:
> On Sat, 9 Dec 2000, S. Massy wrote:
>
> > Has something been changed in the code responsible for writing wave
> > files headers?
> > It seems that ecasound leaves a zero in the length field, or so
> > complained foreign applications. To play a wave produced by ecasound
> > with sox I had to put it into "raw mode". I didn't have this problem
>
> Nothing has been changed in a long while. Ecasound initialized the
> length to zero when wav-file is create, and only updates the field
> when closing the file (only then we know the length of the created
> file). Now in some cases (ecasound crashes, etc), the wave-header might
> not get updated. If this happens "ecasound -i broken.wav -o fixed.wav"
> should do the trick. I tried latest ecasound&sox combination and worked
> fine for me.
Well, something is wrong definitely, I had never ru across this before: here's a documented example...
Script started on Sun Dec 10 17:56:52 2000
tak:/mnt/tmp# ecasound -d:255 -i:/dev/dsp -o:test.wav -c
****************************************************************************
*[1m ecasound v1.8.6d15 (C) 1997-2000 Kai Vehmanen [0;10m*
****************************************************************************
(eca-session) Set debug level to: 255
(eca-session) Interactive mode enabled.
(samplebuffer<>) Buffer created, channels: 0, length-samples: 0, sample rate: 0.
(eca-static-object-maps) Opening internal plugin file "/usr/local/lib/ecasound-plugins/libaudioio_alsa.so" failed, because: "undefined symbol: audio_io_interface_version"
(audioio-alsa2) construct
(audioio-alsa2) construct
(eca-static-object-maps) Opening internal plugin file "/usr/local/lib/ecasound-plugins/libaudioio_alsa3.so" failed, because: "undefined symbol: audio_io_interface_version"
(eca-static-object-maps) Opening internal plugin file "/usr/local/lib/ecasound-plugins/libaudioio_arts.so" failed, because: "undefined symbol: audio_io_interface_version"
(eca-chainsetup) Interpreting global option "-i:/dev/dsp".
(eca-chainsetup) Interpreting global option "-o:test.wav".
(chain) constuctor: CHAIN
add_default_chain()
(eca-chainsetup) Interpreting object option "-i:/dev/dsp".
(eca-audio-objects) adding file "/dev/dsp".
Eca-audio-objects/Parsing input
(eca-object-map) match: /dev/dsp[0-9]*-/dev/dsp
(eca-object-factory) Object "-i:/dev/dsp" created, type "OSS soundcard device". Has 1 parameter(s).
(eca-audio-objects) Assigning file to chains: default
(eca-chainsetup) Interpreting object option "-o:test.wav".
(eca-audio-objects) adding file "test.wav".
Eca-audio-objects/Parsing output
(eca-object-map) match: \.wav$-.wav
(eca-object-factory) Object "-o:test.wav" created, type "RIFF wave file". Has 2 parameter(s).
(eca-chainsetup) Assigning file to chains: default
- [ [1mChainsetup/Enabling audio inputs[0;10m ] -------------------------------------
(audioio-types/buffered) /dev/dsp: Setting buffer size [1024,44100].
(audioio-types/buffered) /dev/dsp: Set buffer size [1024].
Setting OSS fragment size according to buffersize() 1024.
Setting OSS fragment size to 4096.
set OSS fragment size to (2^x) 12.
OSS set to use fragment size of 4096.
(eca-audio-objects) Audio object "/dev/dsp", mode "read".
(audio-io) Format: s16_le, channels 2, srate 44100, interleaved.
- [ [1mChainsetup/Enabling audio outputs[0;10m ] ------------------------------------
(audioio-types/buffered) test.wav: Setting buffer size [1024,44100].
(audioio-types/buffered) test.wav: Set buffer size [1024].
(program flow: write_riff_header())
Riff ID: RIFF
Wave data size 4294967284
Riff type Riff type: WAVE
Wrote RIFF format header.
(program flow: write_riff_datablock())
(eca-audio-objects) Audio object "test.wav", mode "read/write".
(audio-io) Format: s16_le, channels 2, srate 44100, interleaved.
Connecting connected chainsetup to engine.
ecasound ('h' for help)> t
- [ [1mController/Processing started[0;10m ] ----------------------------------------
ecasound ('h' for help)> (eca-controller) Engine-thread pid: 24926
(samplebuffer<>) Buffer created, channels: 2, length-samples: 1024, sample rate: 0.
Engine/Initializing
(audioio-types/buffered) /dev/dsp: Setting buffer size [1024,44100].
(audioio-types/buffered) /dev/dsp: Set buffer size [1024].
Input "/dev/dsp": start position 0, number of connected chain 1 .
(audioio-types/buffered) test.wav: Setting buffer size [1024,44100].
(audioio-types/buffered) test.wav: Set buffer size [1024].
Output "test.wav": start position 0, number of connected chain 1 .
(samplebuffer<>) Buffer created, channels: 2, length-samples: 1024, sample rate: 44100.
(samplebuffer<>) Buffer copy-constructed, channels: 2, length-samples: 1024, sample rate: 44100.
- [ [1mEngine/Init - mixmode "simple"[0;10m ] ---------------------------------------
(eca-main) Start
(audioio-oss) Audio device "/dev/dsp" started.
s
- [ [1mController/Processing stopped[0;10m ] ----------------------------------------
ecasound ('h' for help)> (eca-main) Stop
(audioio-oss) Audio device "/dev/dsp" disabled.
(eca-main) Signaling stop-cond
quit
(eca-main) ecasound_queue: exit!
ECA_PROCESSOR destructor!
- [ [1mEngine/Exiting[0;10m ] -------------------------------------------------------
--- Exiting... tak:/mnt/tmp# wavp test.wav WavTools 1.3 Written by Colin Ligertwood. This software is provided as is. No waranty is offered, implied or included. Playing [FILE: test.wav] [LENGTH: 0] [RATE: 44100] [BPS: 176400] [DEPTH: 16] [CHANNELS: 2]tak:/mnt/tmp# exit exit
Script done on Sun Dec 10 17:59:15 2000
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