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ALSA: Further rework:

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* Get rid of non-async (ie tick task) mode due to inherent brokenness
 * Get rid of nonblock mode; we never write if buffers aren't sufficient
 * Move driver init into pcm_open() instead of pcm_init()
 * Much better underrun handling
 * Better error handling in some situations
 * Add in recording functionality
 * Use smaller audio buffers to avoid glitching
 * Don't start audio buffer with silence
 * Allow device name to be overridden by target

Recording portions based on work done by Lorenzo Miori in g#633

Change-Id: I0197bdc1749c28109eb79def1e6a3e1d62d8cef3
This commit is contained in:
Solomon Peachy 2020-10-22 17:15:45 -04:00
parent 2cf75bf008
commit 46e357f1bb
2 changed files with 370 additions and 192 deletions
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6
firmware/target/hosted/pcm-alsa.h
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@ -28,6 +28,12 @@
void pcm_alsa_set_digital_volume(int vol_db_l, int vol_db_r);
#endif
/* These two should be invoked in your audiohw_preinit() call! */
void pcm_alsa_set_playback_device(const char *device);
#if defined(HAVE_RECORDING)
void pcm_alsa_set_capture_device(const char *device);
#endif
int pcm_alsa_get_rate(void);
#endif /* __PCM_ALSA_RB_H__ */