diff options
Diffstat (limited to 'libs/backends/alsa/alsa_audiobackend.cc')
| -rw-r--r-- | libs/backends/alsa/alsa_audiobackend.cc | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/libs/backends/alsa/alsa_audiobackend.cc b/libs/backends/alsa/alsa_audiobackend.cc index b0997a6202..d0236327f3 100644 --- a/libs/backends/alsa/alsa_audiobackend.cc +++ b/libs/backends/alsa/alsa_audiobackend.cc @@ -330,6 +330,15 @@ AlsaAudioBackend::available_output_channel_count (const std::string& device) con return 128; } +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); + return ps; +} + bool AlsaAudioBackend::can_change_sample_rate_when_running () const { @@ -423,6 +432,19 @@ AlsaAudioBackend::set_sample_rate (float sr) } int +AlsaAudioBackend::set_peridod_size (uint32_t n) +{ + if (n == 0 || n > 3) { + return -1; + } + if (_run) { + return -1; + } + _periods_per_cycle = n; + return 0; +} + +int AlsaAudioBackend::set_buffer_size (uint32_t bs) { if (bs <= 0 || bs >= _max_buffer_size) { @@ -526,6 +548,12 @@ AlsaAudioBackend::buffer_size () const return _samples_per_period; } +uint32_t +AlsaAudioBackend::period_size () const +{ + return _periods_per_cycle; +} + bool AlsaAudioBackend::interleaved () const { @@ -1208,6 +1236,8 @@ AlsaAudioBackend::register_system_audio_ports() const int a_ins = _n_inputs; const int a_out = _n_outputs; + // TODO set latency depending on _periods_per_cycle and _samples_per_period + /* audio ports */ lr.min = lr.max = (_measure_latency ? 0 : _systemic_audio_input_latency); for (int i = 1; i <= a_ins; ++i) { @@ -1282,7 +1312,7 @@ AlsaAudioBackend::register_system_midi_ports() LatencyRange lr; lr.min = lr.max = (_measure_latency ? 0 : nfo->systemic_output_latency); set_latency_range (p, false, lr); - static_cast<AlsaMidiPort*>(p)->set_n_periods(2); + static_cast<AlsaMidiPort*>(p)->set_n_periods(_periods_per_cycle); // TODO check MIDI alignment _system_midi_out.push_back(static_cast<AlsaPort*>(p)); _rmidi_out.push_back (mout); } |