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From: Takashi Sakamoto <o-takashi@sakamocchi.jp>
To: Clemens Ladisch <clemens@ladisch.de>
Cc: tiwai@suse.de, alsa-devel@alsa-project.org, ffado-devel@lists.sf.net
Subject: Re: [PATCH 05/39] firewire-lib: Add support for AMDTP in-stream and PCM capture
Date: Fri, 14 Mar 2014 22:50:21 +0900
Message-ID: <5323091D.8070209@sakamocchi.jp> (raw)
In-Reply-To: <531CD0FA.9090506@ladisch.de>

Clemens,

> In practice, this error means that a packet was dropped.  I guess this
> doesn't actually happen too often, but eventually, we should handle
> this either by inserting some samples or by stopping the stream.

I'm working for this and I realize Fireworks has some quirks.

(I guess that I had experienced this last year then remove codes to 
check it and forget it now...)

Well, in IEC 61883-1, the value of dbc field corresponds to the first 
data block in a packet. And the value of dbc in a first packet is zero. 
So it also means count of transmitted data blocks (described in IEC 
61883-6).

But for Fireworks, the value of dbc field corresponds to the end data 
block in a packet. See two samples below.

BeBoB - M-Audio Firewire Solo:
34 02040010 900234B2
02 02040018 9002FFFF
34 02040018 900248B2
34 02040020 900260B2
34 02040028 900274B2
02 02040030 9002FFFF
34 02040030 900288B2
34 02040038 9002A0B2
34 02040040 9002B4B2
02 02040048 9002FFFF
34 02040048 9002C8B2
34 02040050 9002E0B2
34 02040058 9002F4B2
02 02040060 9002FFFF
34 02040060 900208B2

Fireworks - AudioFire4(firmware 5.21):
Payload CIP0 CIP1
3A 00070028 9001C704
02 00070028 90FFFFFF
3A 00070030 9001E06E
3A 00070038 9001F5D8
3A 00070040 90010B42
02 00070040 90FFFFFF
3A 00070048 900124AC
3A 00070050 90013A16
02 00070050 90FFFFFF
3A 00070058 90015380
3A 00070060 900168EA
02 00070060 90FFFFFF
3A 00070068 90018254

Let us focus on the value of dbc in empty packet. In BeBoB, the value of 
dbc in packets following to empty packet is the same as the value in the 
empty packet. In Fireworks, the value of dbc in packets following to 
empty packet is not the same as the value in the empty packet, however 
the value of dbc in packets followed by empty packet is the same as the 
value in the empty packet. This means dbc corresponds to the end of data 
block in current packet. I can see this quirk on 
AudioFire4/AudioFirePre8 with firmware version 4.8-5.8, so I guess all 
of Fireworks have this quirk. (quirk 1)

Additionally, firmware version 5.5 seems to have a quirk to report fix 
value (0x08) for dbc interval in all sampling rates. I confirm this on 
AudioFire4 and AudioFirePre8, so I guess all of Fireworks with firmware 
version 5.5 have this quirk. (quirk 2)

Furthermore, Firmware named 'AudioFire9' seems to have a quirk to report 
fix value (0x11) for dbs in all sampling rates instead of actual value. 
I confirm this on AudioFirePre8 with firmware version 4.8-5.8. 
AudioFire8 (since July 2009) uses the same firmware so I guess this 
model has also this quirk. (quirk 3)

And as I mentioned before, BeBoB has a quirk not to increment dbc in 
initial state of transmitting. (quirk 4)

If firewire-lib has codes for these quirks, it can check dbc continuity.
So I'll to add some flags for these issue into 'struct amdtp_stream', like:
struct amdtp_stream {
...
	bool tx_dbc_is_end_event;	// for quirk 1
	unsigned int tx_dbc_interval;	// for quirk 2
	bool tx_dbs_is_wrong;		// for quirk 3
	bool skip_initial_tx_packets;	// for quirk 4
...
};

But 'struct amdtp_stream' has 'flag' member. Should I use this member 
instead of adding new members?


Regards

Takashi Sakamoto
o-takashi@sakamocchi.jp

  parent reply index

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <5316963F.1000206@sakamocchi.jp>
2014-03-05  6:14 ` [GIT PULL v2] Enhancement of support for Firewire devices Takashi Iwai
2014-03-05 11:00   ` Takashi Sakamoto
2014-03-05 11:09     ` Takashi Iwai
2014-03-05 11:23       ` Takashi Sakamoto
2014-03-05 10:47 ` [GIT PULL][PATCH 00/39 " Takashi Sakamoto
2014-03-05 10:47   ` [PATCH 01/39] firewire-lib: Rename functions, structure, member for AMDTP Takashi Sakamoto
2014-03-05 10:47   ` [PATCH 02/39] firewire-lib: Add macros instead of fixed value " Takashi Sakamoto
2014-03-05 10:47   ` [PATCH 03/39] firewire-lib: Add 'direction' member to 'amdtp_stream' structure Takashi Sakamoto
2014-03-05 10:47   ` [PATCH 04/39] firewire-lib: Split some codes into functions to reuse for both streams Takashi Sakamoto
2014-03-05 10:47   ` [PATCH 05/39] firewire-lib: Add support for AMDTP in-stream and PCM capture Takashi Sakamoto
2014-03-09 20:37     ` Clemens Ladisch
2014-03-10  3:55       ` Takashi Sakamoto
2014-03-12  2:00       ` Takashi Sakamoto
2014-03-14 13:50       ` Takashi Sakamoto [this message]
2014-03-05 10:47   ` [PATCH 06/39] firewire-lib: Add support for MIDI capture/playback Takashi Sakamoto
2014-03-09 20:48     ` Clemens Ladisch
2014-03-10  4:13       ` Takashi Sakamoto
2014-03-05 10:47   ` [PATCH 07/39] firewire-lib: Give syt value as parameter to handle_out_packet() Takashi Sakamoto
2014-03-05 10:47   ` [PATCH 08/39] firewire-lib: Add support for duplex streams synchronization in blocking mode Takashi Sakamoto
2014-03-09 20:55     ` Clemens Ladisch
2014-03-10 12:21       ` Takashi Sakamoto
2014-03-05 10:47   ` [PATCH 09/39] firewire-lib: Add sort function for transmitted packet Takashi Sakamoto
2014-03-09 21:07     ` Clemens Ladisch
2014-03-10 13:29       ` Takashi Sakamoto
2014-03-11  8:11         ` Clemens Ladisch
2014-03-12  1:23           ` Takashi Sakamoto
2014-03-12  7:21             ` Takashi Iwai
2014-03-05 10:47   ` [PATCH 10/39] firewire-lib: Add transfer delay to synchronized duplex streams Takashi Sakamoto
2014-03-09 21:13     ` Clemens Ladisch
2014-03-10 13:43       ` Takashi Sakamoto
2014-03-11  8:13         ` Clemens Ladisch
2014-03-05 10:47   ` [PATCH 11/39] firewire-lib: Add support for channel mapping Takashi Sakamoto
2014-03-09 21:20     ` Clemens Ladisch
2014-03-10 12:28       ` Takashi Sakamoto
2014-03-10 12:58         ` Takashi Sakamoto
2014-03-11  8:23         ` Clemens Ladisch
2014-03-11 16:03           ` Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 12/39] firewire-lib: Rename macros, variables and functions for CMP Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 13/39] firewire-lib: Add 'direction' member to 'cmp_connection' structure Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 14/39] firewire-lib: Add handling output connection by CMP Takashi Sakamoto
2014-03-09 21:27     ` Clemens Ladisch
2014-03-10 12:30       ` Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 15/39] firewire-lib: Add a new function to check others' connection Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 16/39] firewire-lib: Add some AV/C general commands Takashi Sakamoto
2014-03-09 21:32     ` Clemens Ladisch
2014-03-10 12:46       ` Takashi Sakamoto
2014-03-14 14:10       ` Takashi Sakamoto
2014-03-14 22:18         ` Clemens Ladisch
2014-03-05 10:48   ` [PATCH 17/39] firewire-lib: Add quirks for Fireworks Takashi Sakamoto
2014-03-09 21:39     ` Clemens Ladisch
2014-03-10 12:40       ` Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 18/39] firewire-lib: Add a fallback at RCODE_CANCELLED Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 19/39] fireworks: Add skelton for Fireworks based devices Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 20/39] fireworks: Add transaction and some commands Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 21/39] fireworks: Add connection and stream management Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 22/39] fireworks: Add proc interface for debugging purpose Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 23/39] fireworks: Add MIDI interface Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 24/39] fireworks: Add PCM interface Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 25/39] fireworks: Add hwdep interface Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 26/39] fireworks: Add command/response functionality into " Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 27/39] bebob: Add skelton for BeBoB based devices Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 28/39] bebob: Add commands and connections/streams management Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 29/39] bebob: Add proc interface for debugging purpose Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 30/39] bebob: Add MIDI interface Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 31/39] bebob: Add PCM interface Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 32/39] bebob: Add hwdep interface Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 33/39] bebob: Prepare for device specific operations Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 34/39] bebob: Add support for Terratec PHASE, EWS series and Aureon Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 35/39] bebob: Add support for Yamaha GO series Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 36/39] bebob: Add support for Focusrite Saffire/SaffirePro series Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 37/39] bebob: Add support for M-Audio usual Firewire series Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 38/39] bebob: Add support for M-Audio special " Takashi Sakamoto
2014-03-05 10:48   ` [PATCH 39/39] bebob: Send a cue to load firmware for M-Audio " Takashi Sakamoto
2014-03-07 11:44 ` [GIT PULL v2] Enhancement of support for Firewire devices Takashi Iwai
2014-03-07 14:46   ` Clemens Ladisch
2014-02-28  3:27 [GIT PULL][PATCH 00/39] " Takashi Sakamoto
2014-02-28  3:27 ` [PATCH 05/39] firewire-lib: Add support for AMDTP in-stream and PCM capture Takashi Sakamoto

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