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ALSA: firewire-lib: rename parameter setting function for AM824 with FDF field

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The value of FDF field in CIP header is protocol-dependent. Thus, it's
better to allow data block processing layer to decide the value in any
timing.

In AM824 data format, the value of FDF field in CIP header indicates
N-flag and Nominal Sampling Frequency Code (sfc). The N-flag is for
switching 'Clock-based rate control mode' and 'Command-based rate control
mode'. In our implementation, 'Clock-based rate control mode' is just
supported. Therefore, When sampling transfer frequency is decided, then
the FDF can be set.

This commit replaces 'amdtp_stream_set_parameters' with
'amdtp_am824_set_parameters' to set the FDF. This is the same timing
to decide the ration between the number of data blocks and the number of
PCM frames.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2015-09-19 11:21:56 +09:00 committed by Takashi Iwai
parent 5955815e71
commit 51c29fd213
8 changed files with 62 additions and 33 deletions
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42
sound/firewire/amdtp-am824.c
View File

@ -10,6 +10,48 @@
#define CIP_FMT_AM 0x10
/* "Clock-based rate control mode" is just supported. */
#define AMDTP_FDF_AM824 0x00
/**
* amdtp_am824_set_parameters - set stream parameters
* @s: the AMDTP stream to configure
* @rate: the sample rate
* @pcm_channels: the number of PCM samples in each data block, to be encoded
* as AM824 multi-bit linear audio
* @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels)
* @double_pcm_frames: one data block transfers two PCM frames
*
* The parameters must be set before the stream is started, and must not be
* changed while the stream is running.
*/
int amdtp_am824_set_parameters(struct amdtp_stream *s, unsigned int rate,
unsigned int pcm_channels,
unsigned int midi_ports,
bool double_pcm_frames)
{
int err;
err = amdtp_stream_set_parameters(s, rate, pcm_channels, midi_ports);
if (err < 0)
return err;
s->fdf = AMDTP_FDF_AM824 | s->sfc;
/*
* In IEC 61883-6, one data block represents one event. In ALSA, one
* event equals to one PCM frame. But Dice has a quirk at higher
* sampling rate to transfer two PCM frames in one data block.
*/
if (double_pcm_frames)
s->frame_multiplier = 2;
else
s->frame_multiplier = 1;
return 0;
}
EXPORT_SYMBOL_GPL(amdtp_am824_set_parameters);
/**
* amdtp_am824_init - initialize an AMDTP stream structure to handle AM824
* data block

5
sound/firewire/amdtp-am824.h
View File

@ -3,6 +3,11 @@
#include "amdtp-stream.h"
int amdtp_am824_set_parameters(struct amdtp_stream *s, unsigned int rate,
unsigned int pcm_channels,
unsigned int midi_ports,
bool double_pcm_frames);
int amdtp_am824_init(struct amdtp_stream *s, struct fw_unit *unit,
enum amdtp_stream_direction dir, enum cip_flags flags);
#endif

21
sound/firewire/amdtp-stream.c
View File

@ -54,12 +54,8 @@
#define CIP_SYT_MASK 0x0000ffff
#define CIP_SYT_NO_INFO 0xffff
/*
* Audio and Music transfer protocol specific parameters
* only "Clock-based rate control mode" is supported
*/
/* Audio and Music transfer protocol specific parameters */
#define CIP_FMT_AM 0x10
#define AMDTP_FDF_AM824 0x00
#define AMDTP_FDF_NO_DATA 0xff
/* TODO: make these configurable */
@ -204,8 +200,7 @@ EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints);
int amdtp_stream_set_parameters(struct amdtp_stream *s,
unsigned int rate,
unsigned int pcm_channels,
unsigned int midi_ports,
bool double_pcm_frames)
unsigned int midi_ports)
{
unsigned int i, sfc, midi_channels;
@ -228,18 +223,6 @@ int amdtp_stream_set_parameters(struct amdtp_stream *s,
s->data_block_quadlets = s->pcm_channels + midi_channels;
s->midi_ports = midi_ports;
s->fdf = AMDTP_FDF_AM824 | s->sfc;
/*
* In IEC 61883-6, one data block represents one event. In ALSA, one
* event equals to one PCM frame. But Dice has a quirk at higher
* sampling rate to transfer two PCM frames in one data block.
*/
if (double_pcm_frames)
s->frame_multiplier = 2;
else
s->frame_multiplier = 1;
s->syt_interval = amdtp_syt_intervals[sfc];
/* default buffering in the device */

3
sound/firewire/amdtp-stream.h
View File

@ -181,8 +181,7 @@ void amdtp_stream_destroy(struct amdtp_stream *s);
int amdtp_stream_set_parameters(struct amdtp_stream *s,
unsigned int rate,
unsigned int pcm_channels,
unsigned int midi_ports,
bool double_pcm_frames);
unsigned int midi_ports);
unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);
int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed);

4
sound/firewire/bebob/bebob_stream.c
View File

@ -427,7 +427,7 @@ make_both_connections(struct snd_bebob *bebob, unsigned int rate)
index = get_formation_index(rate);
pcm_channels = bebob->tx_stream_formations[index].pcm;
midi_channels = bebob->tx_stream_formations[index].midi;
err = amdtp_stream_set_parameters(&bebob->tx_stream, rate,
err = amdtp_am824_set_parameters(&bebob->tx_stream, rate,
pcm_channels, midi_channels * 8,
false);
if (err < 0)
@ -435,7 +435,7 @@ make_both_connections(struct snd_bebob *bebob, unsigned int rate)
pcm_channels = bebob->rx_stream_formations[index].pcm;
midi_channels = bebob->rx_stream_formations[index].midi;
err = amdtp_stream_set_parameters(&bebob->rx_stream, rate,
err = amdtp_am824_set_parameters(&bebob->rx_stream, rate,
pcm_channels, midi_channels * 8,
false);
if (err < 0)

4
sound/firewire/dice/dice-stream.c
View File

@ -132,8 +132,8 @@ static int start_stream(struct snd_dice *dice, struct amdtp_stream *stream,
pcm_chs *= 2;
}
err = amdtp_stream_set_parameters(stream, rate, pcm_chs, midi_ports,
false);
err = amdtp_am824_set_parameters(stream, rate, pcm_chs, midi_ports,
double_pcm_frames);
if (err < 0)
goto end;

2
sound/firewire/fireworks/fireworks_stream.c
View File

@ -73,7 +73,7 @@ start_stream(struct snd_efw *efw, struct amdtp_stream *stream,
midi_ports = efw->midi_in_ports;
}
err = amdtp_stream_set_parameters(stream, sampling_rate,
err = amdtp_am824_set_parameters(stream, sampling_rate,
pcm_channels, midi_ports, false);
if (err < 0)
goto end;

4
sound/firewire/oxfw/oxfw-stream.c
View File

@ -155,8 +155,8 @@ static int start_stream(struct snd_oxfw *oxfw, struct amdtp_stream *stream,
err = -EINVAL;
goto end;
}
err = amdtp_stream_set_parameters(stream, rate,
pcm_channels, midi_ports, false);
err = amdtp_am824_set_parameters(stream, rate, pcm_channels, midi_ports,
false);
if (err < 0)
goto end;