diff options
Diffstat (limited to 'libs/backends/alsa/alsa_audiobackend.cc')
| -rw-r--r-- | libs/backends/alsa/alsa_audiobackend.cc | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/libs/backends/alsa/alsa_audiobackend.cc b/libs/backends/alsa/alsa_audiobackend.cc index 7dec3eb738..6c931b08cb 100644 --- a/libs/backends/alsa/alsa_audiobackend.cc +++ b/libs/backends/alsa/alsa_audiobackend.cc @@ -270,8 +270,27 @@ std::vector<uint32_t> AlsaAudioBackend::available_period_sizes (const std::string& driver) const { std::vector<uint32_t> ps; - ps.push_back (2); - ps.push_back (3); + + ALSADeviceInfo *nfo = NULL; + if (device == get_standard_device_name(DeviceNone)) { + return ps; + } + if (device == _output_audio_device && _output_audio_device_info.valid) { + nfo = &_output_audio_device_info; + } else { + ps.push_back (2); + return ps; + } + + if (nfo->min_nper == 2) { + ps.push_back (2); + if (nfo->max_nper >= 3) { + ps.push_back (3); + } + } else { + ps.push_back (nfo->min_nper); + } + return ps; } @@ -370,7 +389,7 @@ AlsaAudioBackend::set_sample_rate (float sr) int AlsaAudioBackend::set_peridod_size (uint32_t n) { - if (n == 0 || n > 3) { + if (n == 0) { return -1; } if (_run) { @@ -830,7 +849,7 @@ AlsaAudioBackend::_start (bool for_latency_measurement) (duplex & 1) ? alsa_device.c_str() : NULL, /* ctrl name */ 0, _samplerate, _samples_per_period, - _periods_per_cycle, /* _periods_per_cycle */ 2, + _periods_per_cycle, /* capture p/c */ 2, /* debug */ 0); AudioBackend::ErrorCode error_code = NoError; |