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Previously the timebase was not documented. Now a new pcm_open flag
can be used to specify the clock. If flag PCM_MONOTONIC is specified,
then pcm_open uses SNDRV_PCM_IOCTL_TTSTAMP with parameter
SNDRV_PCM_TSTAMP_TYPE_MONOTONIC to request timestamps in CLOCK_MONOTONIC.
Change-Id: I40ce359cb38d686cbb2521fb0602a8a17ab4f925
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S24_LE is 24 bit audio in a 32 bit sample size. Also
make the pcm_format_to_bits() function part of the API
since it will be required for tinycap.
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Some sound cards update their controls due to external
events, such as HDMI EDID byte data changing when an
HDMI cable is connected. This API allows the count of
elements to be updated.
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This replaces (and extends) the existing get/set_bytes
API, which is no longer required.
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This enables the capabilities of any given PCM to be queried.
Created with input from Priyesh Bisla and Gabriel Beddingfield.
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For binary controls we don't want to go through
mixer_ctl_{set,get}_value() as that will trigger many calls to our
get()/put() callback in the kernel. Set the entire payload at once
and trigger the get()/put() callback once.
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
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Add a flag which can be passed to pcm_open (called PCM_NORESTART).
When set on a playback stream, calls to pcm_write will not
automatically attempt to restart an ALSA device in the case of an
underflow. Instead, it will propagate the first EPIPE error up to the
application to allow it to handle the underflow situation. Subsequent
calls to pcm_write will attempt to start the pipeline.
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Just like the pcm_get_error() API, simplify the mixer API
functions to return pointers to constant strings instead
of making copies of strings.
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Mark the write buffers as const - they won't be modified and this is
friendlier to applications.
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Comment on buffer size was wrong. Argument to bytes_to_frames
is bytes, not frames
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Add mmap playback and no period IRQ support to pcm core.
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Add the ability to explicitly set start, stop and silence thresholds during
tinyalsa's pcm_open. Setting any of these values to 0 in your pcm_config
structure will cause the system to use its old defaults.
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Add a extern "C" controlled by an #ifdef __cplusplus directive so that this
header can be included from C++ code without having to explicitly control the
linkage.
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include: Add a local asound.h to allow build with current public releases
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pcm_get_htimestamp() returns the number of available frames
in the kernel driver buffers as well as the corresponding
high resolution time stamp.
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Bionic does not ship a copy of asound.h and it should do no harm to have
a local copy here.
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This is essential for streams such as loopback devices that
do not transfer data.
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- re-add function to set enum type by string
- implement setting of mixer values in tinymix
- fix bug: read current mixer values before writing
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- simplify interface for setting/getting enum values
- implement enum string get function
- update tinymix to deal with enums
- rename set/get_int functions because of supported types
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- support get/set of multiple values
- add parameter checking to functions
- add api function to get control type
- add tinymix utility to list mixer controls
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