linux-2.6.33/snd_pcm_hw_params()
をテンプレートにして作成
[
トップ
] [
新規
|
一覧
|
検索
|
最終更新
|
ヘルプ
|
ログイン
]
開始行:
*参照元 [#h2e020d9]
#backlinks
*説明 [#b2eff44c]
-パス: [[linux-2.6.33/sound/core/pcm_native.c]]
-FIXME: これは何？
--説明
**引数 [#f0c822e8]
-struct snd_pcm_substream *substream
--
--[[linux-2.6.33/snd_pcm_substream]]
-struct snd_pcm_hw_params *params
--
--[[linux-2.6.33/snd_pcm_hw_params]]
**返り値 [#pb977496]
-int
**参考 [#m6f00da6]
*実装 [#fb31f3fc]
static int snd_pcm_hw_params(struct snd_pcm_substream *s...
struct snd_pcm_hw_params *params)
{
struct snd_pcm_runtime *runtime;
int err, usecs;
unsigned int bits;
snd_pcm_uframes_t frames;
-
--[[linux-2.6.33/snd_pcm_runtime]]
-
--[[linux-2.6.33/snd_pcm_uframes_t]]
if (PCM_RUNTIME_CHECK(substream))
return -ENXIO;
-
--[[linux-2.6.33/PCM_RUNTIME_CHECK()]]
runtime = substream->runtime;
snd_pcm_stream_lock_irq(substream);
-
--[[linux-2.6.33/snd_pcm_stream_lock_irq()]]
switch (runtime->status->state) {
case SNDRV_PCM_STATE_OPEN:
case SNDRV_PCM_STATE_SETUP:
case SNDRV_PCM_STATE_PREPARED:
break;
default:
snd_pcm_stream_unlock_irq(substream);
return -EBADFD;
}
snd_pcm_stream_unlock_irq(substream);
-
--[[linux-2.6.33/SNDRV_PCM_STATE_OPEN]]
-
--[[linux-2.6.33/SNDRV_PCM_STATE_SETUP]]
-
--[[linux-2.6.33/SNDRV_PCM_STATE_PREPARED]]
-
--[[linux-2.6.33/snd_pcm_stream_unlock_irq()]]
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PC...
-
--[[linux-2.6.33/CONFIG_SND_PCM_OSS]]
-
--[[linux-2.6.33/CONFIG_SND_PCM_OSS_MODULE]]
if (!substream->oss.oss)
#endif
if (atomic_read(&substream->mmap_count))
return -EBADFD;
-
--[[linux-2.6.33/atomic_read()]]
params->rmask = ~0U;
err = snd_pcm_hw_refine(substream, params);
if (err < 0)
goto _error;
-
--[[linux-2.6.33/snd_pcm_hw_refine()]]
err = snd_pcm_hw_params_choose(substream, params);
if (err < 0)
goto _error;
-
--[[linux-2.6.33/snd_pcm_hw_params_choose()]]
if (substream->ops->hw_params != NULL) {
err = substream->ops->hw_params(substream, params);
if (err < 0)
goto _error;
}
-
--substream->ops は snd_pcm_ops 型のメンバ
--[[linux-2.6.33/snd_pcm_ops]]
runtime->access = params_access(params);
runtime->format = params_format(params);
runtime->subformat = params_subformat(params);
runtime->channels = params_channels(params);
runtime->rate = params_rate(params);
runtime->period_size = params_period_size(params);
runtime->periods = params_periods(params);
runtime->buffer_size = params_buffer_size(params);
runtime->info = params->info;
runtime->rate_num = params->rate_num;
runtime->rate_den = params->rate_den;
-
--[[linux-2.6.33/params_access()]]
-
--[[linux-2.6.33/params_format()]]
-
--[[linux-2.6.33/params_subformat()]]
-
--[[linux-2.6.33/params_channels()]]
-
--[[linux-2.6.33/params_rate()]]
-
--[[linux-2.6.33/params_period_size()]]
-
--[[linux-2.6.33/params_periods()]]
-
--[[linux-2.6.33/params_buffer_size()]]
bits = snd_pcm_format_physical_width(runtime->format);
runtime->sample_bits = bits;
bits *= runtime->channels;
runtime->frame_bits = bits;
frames = 1;
-
--[[linux-2.6.33/snd_pcm_format_physical_width()]]
while (bits % 8 != 0) {
bits *= 2;
frames *= 2;
}
runtime->byte_align = bits / 8;
runtime->min_align = frames;
/* Default sw params */
runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
runtime->period_step = 1;
runtime->control->avail_min = runtime->period_size;
runtime->start_threshold = 1;
runtime->stop_threshold = runtime->buffer_size;
runtime->silence_threshold = 0;
runtime->silence_size = 0;
runtime->boundary = runtime->buffer_size;
while (runtime->boundary * 2 <= LONG_MAX - runtime->buf...
runtime->boundary *= 2;
-
--[[linux-2.6.33/SNDRV_PCM_TSTAMP_NONE]]
snd_pcm_timer_resolution_change(substream);
runtime->status->state = SNDRV_PCM_STATE_SETUP;
-
--[[linux-2.6.33/snd_pcm_timer_resolution_change()]]
-
--[[linux-2.6.33/SNDRV_PCM_STATE_SETUP]]
pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
substream->latency_id);
-
--[[linux-2.6.33/pm_qos_remove_requirement()]]
-
--[[linux-2.6.33/PM_QOS_CPU_DMA_LATENCY]]
if ((usecs = period_to_usecs(runtime)) >= 0)
pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
substream->latency_id, usecs);
-
--[[linux-2.6.33/period_to_usecs()]]
-
--[[linux-2.6.33/pm_qos_add_requirement()]]
return 0;
_error:
/* hardware might be unuseable from this time,
so we force application to retry to set
the correct hardware parameter settings */
runtime->status->state = SNDRV_PCM_STATE_OPEN;
if (substream->ops->hw_free != NULL)
substream->ops->hw_free(substream);
-
--[[linux-2.6.33/SNDRV_PCM_STATE_OPEN]]
return err;
}
*コメント [#e3348165]
終了行:
*参照元 [#h2e020d9]
#backlinks
*説明 [#b2eff44c]
-パス: [[linux-2.6.33/sound/core/pcm_native.c]]
-FIXME: これは何？
--説明
**引数 [#f0c822e8]
-struct snd_pcm_substream *substream
--
--[[linux-2.6.33/snd_pcm_substream]]
-struct snd_pcm_hw_params *params
--
--[[linux-2.6.33/snd_pcm_hw_params]]
**返り値 [#pb977496]
-int
**参考 [#m6f00da6]
*実装 [#fb31f3fc]
static int snd_pcm_hw_params(struct snd_pcm_substream *s...
struct snd_pcm_hw_params *params)
{
struct snd_pcm_runtime *runtime;
int err, usecs;
unsigned int bits;
snd_pcm_uframes_t frames;
-
--[[linux-2.6.33/snd_pcm_runtime]]
-
--[[linux-2.6.33/snd_pcm_uframes_t]]
if (PCM_RUNTIME_CHECK(substream))
return -ENXIO;
-
--[[linux-2.6.33/PCM_RUNTIME_CHECK()]]
runtime = substream->runtime;
snd_pcm_stream_lock_irq(substream);
-
--[[linux-2.6.33/snd_pcm_stream_lock_irq()]]
switch (runtime->status->state) {
case SNDRV_PCM_STATE_OPEN:
case SNDRV_PCM_STATE_SETUP:
case SNDRV_PCM_STATE_PREPARED:
break;
default:
snd_pcm_stream_unlock_irq(substream);
return -EBADFD;
}
snd_pcm_stream_unlock_irq(substream);
-
--[[linux-2.6.33/SNDRV_PCM_STATE_OPEN]]
-
--[[linux-2.6.33/SNDRV_PCM_STATE_SETUP]]
-
--[[linux-2.6.33/SNDRV_PCM_STATE_PREPARED]]
-
--[[linux-2.6.33/snd_pcm_stream_unlock_irq()]]
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PC...
-
--[[linux-2.6.33/CONFIG_SND_PCM_OSS]]
-
--[[linux-2.6.33/CONFIG_SND_PCM_OSS_MODULE]]
if (!substream->oss.oss)
#endif
if (atomic_read(&substream->mmap_count))
return -EBADFD;
-
--[[linux-2.6.33/atomic_read()]]
params->rmask = ~0U;
err = snd_pcm_hw_refine(substream, params);
if (err < 0)
goto _error;
-
--[[linux-2.6.33/snd_pcm_hw_refine()]]
err = snd_pcm_hw_params_choose(substream, params);
if (err < 0)
goto _error;
-
--[[linux-2.6.33/snd_pcm_hw_params_choose()]]
if (substream->ops->hw_params != NULL) {
err = substream->ops->hw_params(substream, params);
if (err < 0)
goto _error;
}
-
--substream->ops は snd_pcm_ops 型のメンバ
--[[linux-2.6.33/snd_pcm_ops]]
runtime->access = params_access(params);
runtime->format = params_format(params);
runtime->subformat = params_subformat(params);
runtime->channels = params_channels(params);
runtime->rate = params_rate(params);
runtime->period_size = params_period_size(params);
runtime->periods = params_periods(params);
runtime->buffer_size = params_buffer_size(params);
runtime->info = params->info;
runtime->rate_num = params->rate_num;
runtime->rate_den = params->rate_den;
-
--[[linux-2.6.33/params_access()]]
-
--[[linux-2.6.33/params_format()]]
-
--[[linux-2.6.33/params_subformat()]]
-
--[[linux-2.6.33/params_channels()]]
-
--[[linux-2.6.33/params_rate()]]
-
--[[linux-2.6.33/params_period_size()]]
-
--[[linux-2.6.33/params_periods()]]
-
--[[linux-2.6.33/params_buffer_size()]]
bits = snd_pcm_format_physical_width(runtime->format);
runtime->sample_bits = bits;
bits *= runtime->channels;
runtime->frame_bits = bits;
frames = 1;
-
--[[linux-2.6.33/snd_pcm_format_physical_width()]]
while (bits % 8 != 0) {
bits *= 2;
frames *= 2;
}
runtime->byte_align = bits / 8;
runtime->min_align = frames;
/* Default sw params */
runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
runtime->period_step = 1;
runtime->control->avail_min = runtime->period_size;
runtime->start_threshold = 1;
runtime->stop_threshold = runtime->buffer_size;
runtime->silence_threshold = 0;
runtime->silence_size = 0;
runtime->boundary = runtime->buffer_size;
while (runtime->boundary * 2 <= LONG_MAX - runtime->buf...
runtime->boundary *= 2;
-
--[[linux-2.6.33/SNDRV_PCM_TSTAMP_NONE]]
snd_pcm_timer_resolution_change(substream);
runtime->status->state = SNDRV_PCM_STATE_SETUP;
-
--[[linux-2.6.33/snd_pcm_timer_resolution_change()]]
-
--[[linux-2.6.33/SNDRV_PCM_STATE_SETUP]]
pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
substream->latency_id);
-
--[[linux-2.6.33/pm_qos_remove_requirement()]]
-
--[[linux-2.6.33/PM_QOS_CPU_DMA_LATENCY]]
if ((usecs = period_to_usecs(runtime)) >= 0)
pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
substream->latency_id, usecs);
-
--[[linux-2.6.33/period_to_usecs()]]
-
--[[linux-2.6.33/pm_qos_add_requirement()]]
return 0;
_error:
/* hardware might be unuseable from this time,
so we force application to retry to set
the correct hardware parameter settings */
runtime->status->state = SNDRV_PCM_STATE_OPEN;
if (substream->ops->hw_free != NULL)
substream->ops->hw_free(substream);
-
--[[linux-2.6.33/SNDRV_PCM_STATE_OPEN]]
return err;
}
*コメント [#e3348165]
ページ名:
![[PukiWiki]](image/pukiwiki.png "[PukiWiki]")
