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tinyalsasink: Limit period size and count to what the h/w permits

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This commit is contained in:
Arun Raghavan 2016-02-05 15:43:22 +05:30 committed by Arun Raghavan
parent 1b0198631c
commit 5f9065c114
1 changed files with 24 additions and 0 deletions
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24
sys/tinyalsa/tinyalsasink.c
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@ -277,17 +277,41 @@ pcm_config_from_spec (struct pcm_config *config,
config->period_count = spec->buffer_time / spec->latency_time;
}
#define LIMIT(i, min, max) \
if ((i) < (min)) \
(i) = (min); \
else if ((i) > (max)) \
(i) = (max);
static gboolean
gst_tinyalsa_sink_prepare (GstAudioSink * asink, GstAudioRingBufferSpec * spec)
{
GstTinyalsaSink *sink = GST_TINYALSA_SINK (asink);
struct pcm_config config = { 0, };
struct pcm_params *params = NULL;
int period_size_min, period_size_max;
int periods_min, periods_max;
pcm_config_from_spec (&config, spec);
GST_DEBUG_OBJECT (sink, "Requesting %u periods of %u frames",
config.period_count, config.period_size);
params = pcm_params_get (sink->card, sink->device, PCM_OUT);
if (!params)
GST_ERROR_OBJECT (sink, "Could not get PCM params");
period_size_min = pcm_params_get_min (params, PCM_PARAM_PERIOD_SIZE);
period_size_max = pcm_params_get_max (params, PCM_PARAM_PERIOD_SIZE);
periods_min = pcm_params_get_min (params, PCM_PARAM_PERIODS);
periods_max = pcm_params_get_max (params, PCM_PARAM_PERIODS);
pcm_params_free (params);
/* Snap period size/count to the permitted range */
LIMIT (config.period_size, period_size_min, period_size_max);
LIMIT (config.period_count, periods_min, periods_max);
/* mutex with getcaps */
GST_OBJECT_LOCK (sink);