diff options
Diffstat (limited to 'cras/src/server/cras_alsa_helpers.h')
| -rw-r--r-- | cras/src/server/cras_alsa_helpers.h | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/cras/src/server/cras_alsa_helpers.h b/cras/src/server/cras_alsa_helpers.h index 4d90ad58..091049b3 100644 --- a/cras/src/server/cras_alsa_helpers.h +++ b/cras/src/server/cras_alsa_helpers.h @@ -138,22 +138,30 @@ int cras_alsa_set_hwparams(snd_pcm_t *handle, struct cras_audio_format *format, /* Sets up the swparams to alsa. * Args: * handle - The open PCM to configure. + * enable_htimestamp - If non-zero, enable and configure hardware timestamps, + * updated to reflect whether MONOTONIC RAW htimestamps + * are supported by the kernel implementation. * Returns: * 0 on success, negative error on failure. */ -int cras_alsa_set_swparams(snd_pcm_t *handle); +int cras_alsa_set_swparams(snd_pcm_t *handle, int *enable_htimestamp); /* Get the number of used frames in the alsa buffer. * Args: - * handle - The open PCM to configure. - * buf_size - Number of frames in the ALSA buffer. - * used - Filled with the number of used frames. - * underruns - Pointer to the underrun counter. + * handle[in] - The open PCM to configure. + * buf_size[in] - Number of frames in the ALSA buffer. + * avail[out] - Filled with the number of frames available in the buffer. + * tstamp[out] - Filled with the hardware timestamp for the available frames. + * This value is {0, 0} when the device hasn't actually started + * reading or writing frames. + * underruns[in,out] - Pointer to the underrun counter updated if there was + * an underrun. * Returns: * 0 on success, negative error on failure. */ int cras_alsa_get_avail_frames(snd_pcm_t *handle, snd_pcm_uframes_t buf_size, - snd_pcm_uframes_t *used, + snd_pcm_uframes_t *avail, + struct timespec *tstamp, unsigned int *underruns); /* Get the current alsa delay, make sure it's no bigger than the buffer size. |