1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Line 6 Linux USB driver 4 * 5 * Copyright (C) 2004-2010 Markus Grabner (line6@grabner-graz.at) 6 */ 7 8 #ifndef PLAYBACK_H 9 #define PLAYBACK_H 10 11 #include <sound/pcm.h> 12 13 #include "driver.h" 14 15 /* 16 * When the TonePort is used with jack in full duplex mode and the outputs are 17 * not connected, the software monitor produces an ugly noise since everything 18 * written to the output buffer (i.e., the input signal) will be repeated in 19 * the next period (sounds like a delay effect). As a workaround, the output 20 * buffer is cleared after the data have been read, but there must be a better 21 * solution. Until one is found, this workaround can be used to fix the 22 * problem. 23 */ 24 #define USE_CLEAR_BUFFER_WORKAROUND 1 25 26 extern const struct snd_pcm_ops snd_line6_playback_ops; 27 28 extern int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm); 29 extern int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm); 30 31 #endif 32
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