mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 15:04:27 +08:00
813a17cab9
While draining a stream, ALSA PCM core stops the stream by issuing snd_pcm_stop() after all data has been sent out. And, at PCM trigger stop, currently USB-audio driver kills the in-flight URBs explicitly, then at sync-stop ops, sync with the finish of all remaining URBs. This might result in a drop of the drained samples as most of USB-audio devices / hosts allow relatively long in-flight samples (as a sort of FIFO). For avoiding the trimming, this patch changes the stream-stop behavior during PCM draining state. Under that condition, the pending URBs won't be killed. The leftover in-flight URBs are caught by the sync-stop operation that shall be performed after the trigger-stop operation. Link: https://lore.kernel.org/r/20210929080844.11583-10-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
56 lines
2.2 KiB
C
56 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __USBAUDIO_ENDPOINT_H
|
|
#define __USBAUDIO_ENDPOINT_H
|
|
|
|
#define SND_USB_ENDPOINT_TYPE_DATA 0
|
|
#define SND_USB_ENDPOINT_TYPE_SYNC 1
|
|
|
|
struct snd_usb_endpoint *snd_usb_get_endpoint(struct snd_usb_audio *chip,
|
|
int ep_num);
|
|
|
|
int snd_usb_add_endpoint(struct snd_usb_audio *chip, int ep_num, int type);
|
|
|
|
struct snd_usb_endpoint *
|
|
snd_usb_endpoint_open(struct snd_usb_audio *chip,
|
|
const struct audioformat *fp,
|
|
const struct snd_pcm_hw_params *params,
|
|
bool is_sync_ep);
|
|
void snd_usb_endpoint_close(struct snd_usb_audio *chip,
|
|
struct snd_usb_endpoint *ep);
|
|
int snd_usb_endpoint_configure(struct snd_usb_audio *chip,
|
|
struct snd_usb_endpoint *ep);
|
|
int snd_usb_endpoint_get_clock_rate(struct snd_usb_audio *chip, int clock);
|
|
|
|
bool snd_usb_endpoint_compatible(struct snd_usb_audio *chip,
|
|
struct snd_usb_endpoint *ep,
|
|
const struct audioformat *fp,
|
|
const struct snd_pcm_hw_params *params);
|
|
|
|
void snd_usb_endpoint_set_sync(struct snd_usb_audio *chip,
|
|
struct snd_usb_endpoint *data_ep,
|
|
struct snd_usb_endpoint *sync_ep);
|
|
void snd_usb_endpoint_set_callback(struct snd_usb_endpoint *ep,
|
|
int (*prepare)(struct snd_usb_substream *subs,
|
|
struct urb *urb,
|
|
bool in_stream_lock),
|
|
void (*retire)(struct snd_usb_substream *subs,
|
|
struct urb *urb),
|
|
struct snd_usb_substream *data_subs);
|
|
|
|
int snd_usb_endpoint_start(struct snd_usb_endpoint *ep);
|
|
void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep, bool keep_pending);
|
|
void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep);
|
|
void snd_usb_endpoint_suspend(struct snd_usb_endpoint *ep);
|
|
int snd_usb_endpoint_activate(struct snd_usb_endpoint *ep);
|
|
void snd_usb_endpoint_release(struct snd_usb_endpoint *ep);
|
|
void snd_usb_endpoint_free_all(struct snd_usb_audio *chip);
|
|
|
|
int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep);
|
|
int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep,
|
|
struct snd_urb_ctx *ctx, int idx,
|
|
unsigned int avail);
|
|
void snd_usb_queue_pending_output_urbs(struct snd_usb_endpoint *ep,
|
|
bool in_stream_lock);
|
|
|
|
#endif /* __USBAUDIO_ENDPOINT_H */
|