Root/drivers/staging/line6/playback.h

1/*
2 * Line6 Linux USB driver - 0.9.1beta
3 *
4 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2.
9 *
10 */
11
12#ifndef PLAYBACK_H
13#define PLAYBACK_H
14
15#include <sound/pcm.h>
16
17#include "driver.h"
18
19/*
20 * When the TonePort is used with jack in full duplex mode and the outputs are
21 * not connected, the software monitor produces an ugly noise since everything
22 * written to the output buffer (i.e., the input signal) will be repeated in
23 * the next period (sounds like a delay effect). As a workaround, the output
24 * buffer is cleared after the data have been read, but there must be a better
25 * solution. Until one is found, this workaround can be used to fix the
26 * problem.
27 */
28#define USE_CLEAR_BUFFER_WORKAROUND 1
29
30extern struct snd_pcm_ops snd_line6_playback_ops;
31
32extern int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm);
33extern void line6_free_playback_buffer(struct snd_line6_pcm *line6pcm);
34extern int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm);
35extern void line6_unlink_audio_out_urbs(struct snd_line6_pcm *line6pcm);
36extern void line6_unlink_wait_clear_audio_out_urbs(struct snd_line6_pcm
37                           *line6pcm);
38extern void line6_wait_clear_audio_out_urbs(struct snd_line6_pcm *line6pcm);
39extern int snd_line6_playback_trigger(struct snd_line6_pcm *line6pcm, int cmd);
40
41#endif
42

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