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2012-12-03pcm: add pcm_get_params APISimon Wilson
This enables the capabilities of any given PCM to be queried. Created with input from Priyesh Bisla and Gabriel Beddingfield.
2012-11-09Add -Wall to Makefile and fix warningsSimon Wilson
2012-10-22Fix several 'symbol defined but not used' warnings.Gabriel M. Beddingfield
2012-10-22pcm: Add support for S8 and S24LE formats.Gabriel M. Beddingfield
2012-09-18pcm: fix default capture start thresholdEric Laurent
Default start threshold was set to the same value (half of the buffer size) for playback and capture in pcm_open(). The normal default value for capture should be 1 frame.
2012-05-10add error check for pcm_startKeunyoung
- Otherwise, read will be tried even after pcm_start is failed. This leads into blocking inside the read ioctl forever. pcm_start can fail, for example in full-speed USB audio device, in some H/W, due to the lack of bandwidth in USB bus,
2012-05-04pcm: Add PCM_NORESTART flagJohn Grossman
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.
2012-02-11pcm: Factor out pcm_start() from pcm_read()Mark Brown
When starting the stream we're doing the same as a start()
2012-02-10Merge pull request #11 from broonie/const-writetinyalsa
pcm: Constify write buffers
2012-02-10pcm: Constify write buffersMark Brown
Mark the write buffers as const - they won't be modified and this is friendlier to applications.
2012-02-08pcm: Fix integer size error.Gabriel M. Beddingfield
The following code: while (pcm->boundary * 2 <= LONG_MAX - pcm->buffer_size) pcm->boundary *= 2; Creates an infinite loop on systems where LONG_MAX != INT_MAX (e.g. 64-bit systems). pcm->boundary is an unsigned int, and so INT_MAX is the proper value to use.
2012-01-30pcm: fix pcm capture dropping samplesEric Laurent
Commit ee9ba87d modified the stop threshold for capture and playback and caused pcm samples to be dropped during capture. Restore initial stop threshold for capture and leave new value for playback.
2011-11-17pcm: more state checking in pcm_get_htimestamp()Eric Laurent
pcm_get_htimestamp() should return an error if stream state is not running or draining as the time stamp returned by the driver is not valid in other states. Change-Id: Icdfe9554b26f57119d7a8d762a6ea6e8e3eaf370
2011-11-16pcm: fix underrun detectionEric Laurent
The changes made for mmap mode broke the underrun detection by pushing the stop_threshold beyong the buffer size. This caused the hw_ptr to go past the app_ptr and pcm_get_htimestamp() to report wrong values in case of underrun. Change-Id: Ic671fdd09f3afb8a301a391b48788fd9bc99322d
2011-10-13pcm: add mmap playback and no periodic IRQ support.Liam Girdwood
Add mmap playback and no period IRQ support to pcm core.
2011-07-27pcm: add control for ASLA thresholds to pcm_openJohn Grossman
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.
2011-07-25pcm: add pcm_get_htimestamp() functionEric Laurent
pcm_get_htimestamp() returns the number of available frames in the kernel driver buffers as well as the corresponding high resolution time stamp.
2011-06-24pcm: add pcm_start/stop() functions for streamsSimon Wilson
This is essential for streams such as loopback devices that do not transfer data.
2011-06-15pcm: fix TODOs for 32 bit supportSimon Wilson
2011-06-07Fix error cases and some spurious whitespaceSimon Wilson
2011-06-02Support multiple cards and devicesSimon Wilson
2011-05-30pcm: fix minor code errorsSimon Wilson
2011-05-25Initial contributionSimon Wilson