playback.h 966 B

12345678910111213141516171819202122232425262728293031
  1. /* SPDX-License-Identifier: GPL-2.0-only */
  2. /*
  3. * Line 6 Linux USB driver
  4. *
  5. * Copyright (C) 2004-2010 Markus Grabner ([email protected])
  6. */
  7. #ifndef PLAYBACK_H
  8. #define PLAYBACK_H
  9. #include <sound/pcm.h>
  10. #include "driver.h"
  11. /*
  12. * When the TonePort is used with jack in full duplex mode and the outputs are
  13. * not connected, the software monitor produces an ugly noise since everything
  14. * written to the output buffer (i.e., the input signal) will be repeated in
  15. * the next period (sounds like a delay effect). As a workaround, the output
  16. * buffer is cleared after the data have been read, but there must be a better
  17. * solution. Until one is found, this workaround can be used to fix the
  18. * problem.
  19. */
  20. #define USE_CLEAR_BUFFER_WORKAROUND 1
  21. extern const struct snd_pcm_ops snd_line6_playback_ops;
  22. extern int line6_create_audio_out_urbs(struct snd_line6_pcm *line6pcm);
  23. extern int line6_submit_audio_out_all_urbs(struct snd_line6_pcm *line6pcm);
  24. #endif