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[ALSA] Remove PCM xfer_align sw params

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The xfer_align sw_params parameter has never been used in a sane manner,
and no one understands what this does exactly.  The current
implementation looks also buggy because it allows write of shorter size
than xfer_align.  So, if you do partial writes, the write isn't actually
aligned at all.
Removing this parameter will make some pcm_lib_* code more readable
(and less buggy).

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Takashi Iwai
2008-01-08 18:05:26 +01:00
committed by Jaroslav Kysela
parent fa5717f209
commit d948035a92
7 changed files with 5 additions and 32 deletions
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18
sound/core/pcm_lib.c
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@@ -1628,8 +1628,6 @@ static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
if (size == 0)
return 0;
if (size > runtime->xfer_align)
size -= size % runtime->xfer_align;
snd_pcm_stream_lock_irq(substream);
switch (runtime->status->state) {
@@ -1657,9 +1655,7 @@ static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
avail = snd_pcm_playback_avail(runtime);
if (!avail ||
(snd_pcm_running(substream) &&
((avail < runtime->control->avail_min && size > avail) ||
(size >= runtime->xfer_align &&
avail < runtime->xfer_align)))) {
(avail < runtime->control->avail_min && size > avail))) {
wait_queue_t wait;
enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state;
long tout;
@@ -1731,8 +1727,6 @@ static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
break;
}
}
if (avail > runtime->xfer_align)
avail -= avail % runtime->xfer_align;
frames = size > avail ? avail : size;
cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
if (frames > cont)
@@ -1900,8 +1894,6 @@ static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
if (size == 0)
return 0;
if (size > runtime->xfer_align)
size -= size % runtime->xfer_align;
snd_pcm_stream_lock_irq(substream);
switch (runtime->status->state) {
@@ -1936,12 +1928,12 @@ static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
__draining:
avail = snd_pcm_capture_avail(runtime);
if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
if (avail < runtime->xfer_align) {
if (!avail) {
err = -EPIPE;
goto _end_unlock;
}
} else if ((avail < runtime->control->avail_min && size > avail) ||
(size >= runtime->xfer_align && avail < runtime->xfer_align)) {
} else if (avail < runtime->control->avail_min &&
size > avail) {
wait_queue_t wait;
enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state;
long tout;
@@ -2014,8 +2006,6 @@ static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
break;
}
}
if (avail > runtime->xfer_align)
avail -= avail % runtime->xfer_align;
frames = size > avail ? avail : size;
cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
if (frames > cont)