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input/alsa: dump buffer/period sizes

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This commit is contained in:
Max Kellermann
2017-01-14 21:09:57 +01:00
parent 791efc171a
commit 9f8145e590
1 changed files with 36 additions and 0 deletions
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36
src/input/plugins/AlsaInputPlugin.cxx
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@@ -324,6 +324,26 @@ ConfigureCapture(snd_pcm_t *capture_handle,
throw FormatRuntimeError("Cannot set sample rate (%s)", throw FormatRuntimeError("Cannot set sample rate (%s)",
snd_strerror(err)); snd_strerror(err));
snd_pcm_uframes_t buffer_size_min, buffer_size_max;
snd_pcm_hw_params_get_buffer_size_min(hw_params, &buffer_size_min);
snd_pcm_hw_params_get_buffer_size_max(hw_params, &buffer_size_max);
unsigned buffer_time_min, buffer_time_max;
snd_pcm_hw_params_get_buffer_time_min(hw_params, &buffer_time_min, 0);
snd_pcm_hw_params_get_buffer_time_max(hw_params, &buffer_time_max, 0);
FormatDebug(alsa_input_domain, "buffer: size=%u..%u time=%u..%u",
(unsigned)buffer_size_min, (unsigned)buffer_size_max,
buffer_time_min, buffer_time_max);
snd_pcm_uframes_t period_size_min, period_size_max;
snd_pcm_hw_params_get_period_size_min(hw_params, &period_size_min, 0);
snd_pcm_hw_params_get_period_size_max(hw_params, &period_size_max, 0);
unsigned period_time_min, period_time_max;
snd_pcm_hw_params_get_period_time_min(hw_params, &period_time_min, 0);
snd_pcm_hw_params_get_period_time_max(hw_params, &period_time_max, 0);
FormatDebug(alsa_input_domain, "period: size=%u..%u time=%u..%u",
(unsigned)period_size_min, (unsigned)period_size_max,
period_time_min, period_time_max);
/* period needs to be big enough so that poll() doesn't fire too often, /* period needs to be big enough so that poll() doesn't fire too often,
* but small enough that buffer overruns don't occur if Read() is not * but small enough that buffer overruns don't occur if Read() is not
* invoked often enough. * invoked often enough.
@@ -341,6 +361,22 @@ ConfigureCapture(snd_pcm_t *capture_handle,
throw FormatRuntimeError("Cannot set parameters (%s)", throw FormatRuntimeError("Cannot set parameters (%s)",
snd_strerror(err)); snd_strerror(err));
snd_pcm_uframes_t alsa_buffer_size;
err = snd_pcm_hw_params_get_buffer_size(hw_params, &alsa_buffer_size);
if (err < 0)
throw FormatRuntimeError("snd_pcm_hw_params_get_buffer_size() failed: %s",
snd_strerror(-err));
snd_pcm_uframes_t alsa_period_size;
err = snd_pcm_hw_params_get_period_size(hw_params, &alsa_period_size,
nullptr);
if (err < 0)
throw FormatRuntimeError("snd_pcm_hw_params_get_period_size() failed: %s",
snd_strerror(-err));
FormatDebug(alsa_input_domain, "buffer_size=%u period_size=%u",
(unsigned)alsa_buffer_size, (unsigned)alsa_period_size);
snd_pcm_sw_params_t *sw_params; snd_pcm_sw_params_t *sw_params;
snd_pcm_sw_params_malloc(&sw_params); snd_pcm_sw_params_malloc(&sw_params);