On 11/16/2011 10:31 PM, Andrew Eikum wrote:
On Wed, Nov 16, 2011 at 10:20:07PM +0100, Clemens Ladisch wrote:
Andrew Eikum wrote:
+++ b/include/pcm.h @@ -44,8 +44,20 @@ extern "C" {
/** PCM generic info container */ typedef struct _snd_pcm_info snd_pcm_info_t; -/** PCM hardware configuration space container */
+/** PCM hardware configuration space container
- snd_pcm_hw_params_t is an opaque structure which contains a set of possible
- PCM hardware configurations. For example, a given instance might include a
- range of buffer sizes, a range of period sizes, and a set of several sample
- formats. Some subset of all possible combinations these sets may be valid,
- but not necessarily any combination will be valid.
- No validation is done by the various snd_pcm_hw_params_set* functions.
These functions do validate the value that the application is trying to set and adjust all other dependent limits.
I didn't find that to be the case in my testing, at least between periods, period_size, and buffer_size. I've attached a test program here.
I can reproduce this.
Try running the program with LIBASOUND_DEBUG=1; it appears that there is a bug in the rate plugin. (Normal programs actually set their rate ...)
Regards, Clemens