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ALSA: firewire-lib: flush completed packets when reading PCM position

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By flushing all completed but not yet reported packets before reading
the PCM hardware position, the granularity of the pointer is improved
from the interrupt interval to the packet size.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Clemens Ladisch 2012-05-13 18:49:14 +02:00 committed by Takashi Iwai
parent 76fb878948
commit e9148dddc3
2 changed files with 15 additions and 12 deletions
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14
sound/firewire/amdtp.c
View File

@ -531,6 +531,20 @@ int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed)
}
EXPORT_SYMBOL(amdtp_out_stream_start);
/**
* amdtp_out_stream_pcm_pointer - get the PCM buffer position
* @s: the AMDTP output stream that transports the PCM data
*
* Returns the current buffer position, in frames.
*/
unsigned long amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s)
{
fw_iso_context_flush_completions(s->context);
return ACCESS_ONCE(s->pcm_buffer_pointer);
}
EXPORT_SYMBOL(amdtp_out_stream_pcm_pointer);
/**
* amdtp_out_stream_update - update the stream after a bus reset
* @s: the AMDTP output stream

13
sound/firewire/amdtp.h
View File

@ -84,6 +84,7 @@ void amdtp_out_stream_stop(struct amdtp_out_stream *s);
void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s,
snd_pcm_format_t format);
void amdtp_out_stream_pcm_prepare(struct amdtp_out_stream *s);
unsigned long amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s);
void amdtp_out_stream_pcm_abort(struct amdtp_out_stream *s);
/**
@ -140,18 +141,6 @@ static inline void amdtp_out_stream_pcm_trigger(struct amdtp_out_stream *s,
ACCESS_ONCE(s->pcm) = pcm;
}
/**
* amdtp_out_stream_pcm_pointer - get the PCM buffer position
* @s: the AMDTP output stream that transports the PCM data
*
* Returns the current buffer position, in frames.
*/
static inline unsigned long
amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s)
{
return ACCESS_ONCE(s->pcm_buffer_pointer);
}
static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
{
return sfc & 1;