mirror of https://github.com/AxioDL/boo.git
302 lines
10 KiB
C++
302 lines
10 KiB
C++
#include <memory>
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#include <list>
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#include "boo/audiodev/IAudioVoiceAllocator.hpp"
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#include "logvisor/logvisor.hpp"
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#include <alsa/asoundlib.h>
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#include <signal.h>
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namespace boo
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{
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static logvisor::Module Log("boo::ALSA");
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struct ALSAAudioVoiceAllocator;
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struct ALSAAudioVoice : IAudioVoice
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{
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ALSAAudioVoiceAllocator& m_parent;
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std::list<ALSAAudioVoice*>::iterator m_parentIt;
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ChannelMap m_map;
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IAudioVoiceCallback* m_cb;
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snd_pcm_t* m_pcm = nullptr;
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snd_pcm_uframes_t m_bufSize;
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snd_pcm_uframes_t m_periodSize;
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const ChannelMap& channelMap() const {return m_map;}
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ALSAAudioVoice(ALSAAudioVoiceAllocator& parent, AudioChannelSet set,
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unsigned sampleRate, IAudioVoiceCallback* cb)
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: m_parent(parent), m_cb(cb)
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{
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if (snd_pcm_open(&m_pcm, "default", SND_PCM_STREAM_PLAYBACK, SND_PCM_ASYNC) < 0)
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{
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Log.report(logvisor::Error, "unable to allocate ALSA voice");
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return;
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}
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unsigned chCount = ChannelCount(set);
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int err;
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while ((err = snd_pcm_set_params(m_pcm, SND_PCM_FORMAT_S16, SND_PCM_ACCESS_RW_INTERLEAVED,
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chCount, sampleRate, 1, 100000)) < 0)
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{
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if (set == AudioChannelSet::Stereo)
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break;
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set = AudioChannelSet(int(set) - 1);
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chCount = ChannelCount(set);
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}
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if (err < 0)
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{
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snd_pcm_close(m_pcm);
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m_pcm = nullptr;
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Log.report(logvisor::Error, "unable to set ALSA voice params");
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return;
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}
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snd_pcm_chmap_query_t** chmaps = snd_pcm_query_chmaps(m_pcm);
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if (chmaps)
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{
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snd_pcm_chmap_t* foundChmap = nullptr;
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for (snd_pcm_chmap_query_t** chmap = chmaps ; *chmap != nullptr ; ++chmap)
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{
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if ((*chmap)->map.channels == chCount)
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{
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snd_pcm_chmap_t* chm = &(*chmap)->map;
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uint64_t chBits = 0;
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for (int c=0 ; c<chm->channels ; ++c)
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chBits |= 1 << chm->pos[c];
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bool good = false;
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switch (set)
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{
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case AudioChannelSet::Stereo:
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if ((chBits & (1 << SND_CHMAP_FL)) != 0 &&
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(chBits & (1 << SND_CHMAP_FR)) != 0)
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good = true;
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break;
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case AudioChannelSet::Quad:
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if ((chBits & (1 << SND_CHMAP_FL)) != 0 &&
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(chBits & (1 << SND_CHMAP_FR)) != 0 &&
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(chBits & (1 << SND_CHMAP_RL)) != 0 &&
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(chBits & (1 << SND_CHMAP_RR)) != 0)
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good = true;
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break;
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case AudioChannelSet::Surround51:
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if ((chBits & (1 << SND_CHMAP_FL)) != 0 &&
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(chBits & (1 << SND_CHMAP_FR)) != 0 &&
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(chBits & (1 << SND_CHMAP_RL)) != 0 &&
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(chBits & (1 << SND_CHMAP_RR)) != 0 &&
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(chBits & (1 << SND_CHMAP_FC)) != 0 &&
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(chBits & (1 << SND_CHMAP_LFE)) != 0)
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good = true;
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break;
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case AudioChannelSet::Surround71:
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if ((chBits & (1 << SND_CHMAP_FL)) != 0 &&
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(chBits & (1 << SND_CHMAP_FR)) != 0 &&
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(chBits & (1 << SND_CHMAP_RL)) != 0 &&
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(chBits & (1 << SND_CHMAP_RR)) != 0 &&
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(chBits & (1 << SND_CHMAP_FC)) != 0 &&
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(chBits & (1 << SND_CHMAP_LFE)) != 0 &&
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(chBits & (1 << SND_CHMAP_SL)) != 0 &&
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(chBits & (1 << SND_CHMAP_SR)) != 0)
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good = true;
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break;
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default: break;
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}
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if (good)
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{
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foundChmap = chm;
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break;
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}
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}
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}
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if (!foundChmap)
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{
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snd_pcm_close(m_pcm);
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m_pcm = nullptr;
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snd_pcm_free_chmaps(chmaps);
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Log.report(logvisor::Error, "unable to find matching ALSA voice chmap");
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return;
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}
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m_map.m_channelCount = chCount;
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for (int c=0 ; c<foundChmap->channels ; ++c)
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m_map.m_channels[c] = AudioChannel(foundChmap->pos[c] - 3);
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snd_pcm_set_chmap(m_pcm, foundChmap);
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snd_pcm_free_chmaps(chmaps);
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}
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else
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{
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m_map.m_channelCount = 2;
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m_map.m_channels[0] = AudioChannel::FrontLeft;
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m_map.m_channels[1] = AudioChannel::FrontRight;
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}
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snd_pcm_get_params(m_pcm, &m_bufSize, &m_periodSize);
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snd_pcm_prepare(m_pcm);
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pump();
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}
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~ALSAAudioVoice();
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void bufferSampleData(const int16_t* data, size_t frames)
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{
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if (m_pcm)
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snd_pcm_writei(m_pcm, data, frames);
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}
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void start()
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{
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if (m_pcm)
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snd_pcm_start(m_pcm);
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}
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void stop()
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{
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if (m_pcm)
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snd_pcm_drain(m_pcm);
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}
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void pump()
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{
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snd_pcm_sframes_t frames = snd_pcm_avail(m_pcm);
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if (frames < 0)
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{
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snd_pcm_state_t st = snd_pcm_state(m_pcm);
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if (st == SND_PCM_STATE_XRUN)
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{
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snd_pcm_prepare(m_pcm);
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frames = snd_pcm_avail(m_pcm);
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fprintf(stderr, "REC %ld\n", frames);
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}
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else
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return;
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}
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if (frames < 0)
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return;
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snd_pcm_sframes_t buffers = frames / m_periodSize;
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for (snd_pcm_sframes_t b=0 ; b<buffers ; ++b)
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m_cb->needsNextBuffer(*this, m_periodSize);
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}
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};
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struct ALSAAudioVoiceAllocator : IAudioVoiceAllocator
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{
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std::list<ALSAAudioVoice*> m_allocatedVoices;
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std::unique_ptr<IAudioVoice> allocateNewVoice(AudioChannelSet layoutOut,
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unsigned sampleRate,
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IAudioVoiceCallback* cb)
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{
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ALSAAudioVoice* newVoice = new ALSAAudioVoice(*this, layoutOut, sampleRate, cb);
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newVoice->m_parentIt = m_allocatedVoices.insert(m_allocatedVoices.end(), newVoice);
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std::unique_ptr<IAudioVoice> ret(newVoice);
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if (!newVoice->m_pcm)
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return {};
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return ret;
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}
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AudioChannelSet getAvailableSet()
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{
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snd_pcm_t* pcm;
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if (snd_pcm_open(&pcm, "default", SND_PCM_STREAM_PLAYBACK, SND_PCM_ASYNC) < 0)
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{
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Log.report(logvisor::Error, "unable to allocate ALSA voice");
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return AudioChannelSet::Unknown;
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}
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snd_pcm_chmap_query_t** chmaps = snd_pcm_query_chmaps(pcm);
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if (!chmaps)
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{
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snd_pcm_close(pcm);
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return AudioChannelSet::Stereo;
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}
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static const std::array<AudioChannelSet, 4> testSets =
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{AudioChannelSet::Surround71, AudioChannelSet::Surround51,
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AudioChannelSet::Quad, AudioChannelSet::Stereo};
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for (AudioChannelSet set : testSets)
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{
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for (snd_pcm_chmap_query_t** chmap = chmaps ; *chmap != nullptr ; ++chmap)
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{
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snd_pcm_chmap_t* chm = &(*chmap)->map;
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uint64_t chBits = 0;
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for (int c=0 ; c<chm->channels ; ++c)
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chBits |= 1 << chm->pos[c];
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switch (set)
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{
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case AudioChannelSet::Stereo:
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if ((chBits & (1 << SND_CHMAP_FL)) != 0 &&
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(chBits & (1 << SND_CHMAP_FR)) != 0)
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{
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snd_pcm_free_chmaps(chmaps);
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return AudioChannelSet::Stereo;
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}
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break;
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case AudioChannelSet::Quad:
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if ((chBits & (1 << SND_CHMAP_FL)) != 0 &&
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(chBits & (1 << SND_CHMAP_FR)) != 0 &&
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(chBits & (1 << SND_CHMAP_RL)) != 0 &&
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(chBits & (1 << SND_CHMAP_RR)) != 0)
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{
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snd_pcm_free_chmaps(chmaps);
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return AudioChannelSet::Quad;
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}
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break;
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case AudioChannelSet::Surround51:
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if ((chBits & (1 << SND_CHMAP_FL)) != 0 &&
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(chBits & (1 << SND_CHMAP_FR)) != 0 &&
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(chBits & (1 << SND_CHMAP_RL)) != 0 &&
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(chBits & (1 << SND_CHMAP_RR)) != 0 &&
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(chBits & (1 << SND_CHMAP_FC)) != 0 &&
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(chBits & (1 << SND_CHMAP_LFE)) != 0)
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{
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snd_pcm_free_chmaps(chmaps);
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return AudioChannelSet::Surround51;
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}
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break;
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case AudioChannelSet::Surround71:
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if ((chBits & (1 << SND_CHMAP_FL)) != 0 &&
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(chBits & (1 << SND_CHMAP_FR)) != 0 &&
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(chBits & (1 << SND_CHMAP_RL)) != 0 &&
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(chBits & (1 << SND_CHMAP_RR)) != 0 &&
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(chBits & (1 << SND_CHMAP_FC)) != 0 &&
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(chBits & (1 << SND_CHMAP_LFE)) != 0 &&
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(chBits & (1 << SND_CHMAP_SL)) != 0 &&
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(chBits & (1 << SND_CHMAP_SR)) != 0)
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{
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snd_pcm_free_chmaps(chmaps);
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return AudioChannelSet::Surround71;
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}
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break;
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default: break;
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}
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}
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}
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snd_pcm_free_chmaps(chmaps);
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return AudioChannelSet::Unknown;
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}
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void pumpVoices()
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{
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for (ALSAAudioVoice* vox : m_allocatedVoices)
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vox->pump();
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}
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};
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ALSAAudioVoice::~ALSAAudioVoice()
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{
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if (m_pcm)
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snd_pcm_close(m_pcm);
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m_parent.m_allocatedVoices.erase(m_parentIt);
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}
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std::unique_ptr<IAudioVoiceAllocator> NewAudioVoiceAllocator()
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{
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return std::make_unique<ALSAAudioVoiceAllocator>();
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}
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}
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