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ALSA: snd-aloop: Fix hw_params restrictions and checking 

This patch fixes the hw_params restrictions when first (or playback) stream
sets the final hardware parameters. Also, fix the hw_params checking
in the trigger callback.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2010-10-11 10:45:00 +02:00
parent ac446fb7e6
commit b1c73fc8e6
1 changed files with 106 additions and 18 deletions
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124
sound/drivers/aloop.c
View File

@ -188,7 +188,7 @@ static inline void loopback_timer_stop(struct loopback_pcm *dpcm)
static int loopback_check_format(struct loopback_cable *cable, int stream)
{
struct snd_pcm_runtime *runtime;
struct snd_pcm_runtime *runtime, *cruntime;
struct loopback_setup *setup;
struct snd_card *card;
int check;
@ -200,11 +200,11 @@ static int loopback_check_format(struct loopback_cable *cable, int stream)
}
runtime = cable->streams[SNDRV_PCM_STREAM_PLAYBACK]->
substream->runtime;
check = cable->hw.formats != (1ULL << runtime->format) ||
cable->hw.rate_min != runtime->rate ||
cable->hw.rate_max != runtime->rate ||
cable->hw.channels_min != runtime->channels ||
cable->hw.channels_max != runtime->channels;
cruntime = cable->streams[SNDRV_PCM_STREAM_CAPTURE]->
substream->runtime;
check = runtime->format != cruntime->format ||
runtime->rate != cruntime->rate ||
runtime->channels != cruntime->channels;
if (!check)
return 0;
if (stream == SNDRV_PCM_STREAM_CAPTURE) {
@ -274,12 +274,42 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
return 0;
}
static void params_change_substream(struct loopback_pcm *dpcm,
struct snd_pcm_runtime *runtime)
{
struct snd_pcm_runtime *dst_runtime;
if (dpcm == NULL || dpcm->substream == NULL)
return;
dst_runtime = dpcm->substream->runtime;
if (dst_runtime == NULL)
return;
dst_runtime->hw = dpcm->cable->hw;
}
static void params_change(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct loopback_pcm *dpcm = runtime->private_data;
struct loopback_cable *cable = dpcm->cable;
cable->hw.formats = (1ULL << runtime->format);
cable->hw.rate_min = runtime->rate;
cable->hw.rate_max = runtime->rate;
cable->hw.channels_min = runtime->channels;
cable->hw.channels_max = runtime->channels;
params_change_substream(cable->streams[SNDRV_PCM_STREAM_PLAYBACK],
runtime);
params_change_substream(cable->streams[SNDRV_PCM_STREAM_CAPTURE],
runtime);
}
static int loopback_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct loopback_pcm *dpcm = runtime->private_data;
struct loopback_cable *cable = dpcm->cable;
unsigned int bps, salign;
int bps, salign;
salign = (snd_pcm_format_width(runtime->format) *
runtime->channels) / 8;
@ -303,13 +333,10 @@ static int loopback_prepare(struct snd_pcm_substream *substream)
dpcm->pcm_period_size = frames_to_bytes(runtime, runtime->period_size);
mutex_lock(&dpcm->loopback->cable_lock);
if (!(cable->valid & ~(1 << substream->stream))) {
cable->hw.formats = (1ULL << runtime->format);
cable->hw.rate_min = runtime->rate;
cable->hw.rate_max = runtime->rate;
cable->hw.channels_min = runtime->channels;
cable->hw.channels_max = runtime->channels;
}
if (!(cable->valid & ~(1 << substream->stream)) ||
(get_setup(dpcm)->notify &&
substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
params_change(substream);
cable->valid |= 1 << substream->stream;
mutex_unlock(&dpcm->loopback->cable_lock);
@ -542,6 +569,47 @@ static unsigned int get_cable_index(struct snd_pcm_substream *substream)
return !substream->stream;
}
static int rule_format(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_pcm_hardware *hw = rule->private;
struct snd_mask *maskp = hw_param_mask(params, rule->var);
maskp->bits[0] &= (u_int32_t)hw->formats;
maskp->bits[1] &= (u_int32_t)(hw->formats >> 32);
memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
if (! maskp->bits[0] && ! maskp->bits[1])
return -EINVAL;
return 0;
}
static int rule_rate(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_pcm_hardware *hw = rule->private;
struct snd_interval t;
t.min = hw->rate_min;
t.max = hw->rate_max;
t.openmin = t.openmax = 0;
t.integer = 0;
return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}
static int rule_channels(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_pcm_hardware *hw = rule->private;
struct snd_interval t;
t.min = hw->channels_min;
t.max = hw->channels_max;
t.openmin = t.openmax = 0;
t.integer = 0;
return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}
static int loopback_open(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
@ -579,14 +647,34 @@ static int loopback_open(struct snd_pcm_substream *substream)
snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
/* use dynamic rules based on actual runtime->hw values */
/* note that the default rules created in the PCM midlevel code */
/* are cached -> they do not reflect the actual state */
err = snd_pcm_hw_rule_add(runtime, 0,
SNDRV_PCM_HW_PARAM_FORMAT,
rule_format, &runtime->hw,
SNDRV_PCM_HW_PARAM_FORMAT, -1);
if (err < 0)
goto unlock;
err = snd_pcm_hw_rule_add(runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
rule_rate, &runtime->hw,
SNDRV_PCM_HW_PARAM_RATE, -1);
if (err < 0)
goto unlock;
err = snd_pcm_hw_rule_add(runtime, 0,
SNDRV_PCM_HW_PARAM_CHANNELS,
rule_channels, &runtime->hw,
SNDRV_PCM_HW_PARAM_CHANNELS, -1);
if (err < 0)
goto unlock;
runtime->private_data = dpcm;
runtime->private_free = loopback_runtime_free;
if (get_notify(dpcm) &&
substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (get_notify(dpcm))
runtime->hw = loopback_pcm_hardware;
} else {
else
runtime->hw = cable->hw;
}
unlock:
mutex_unlock(&loopback->cable_lock);
return err;