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https://github.com/Ryujinx/libsoundio.git
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c381526205
This changes the semantics of the callbacks so that instead of a single `requested_frame_count` or `available_frame_count`, the callbacks get a minimum frame count and maximum frame count. The callback must write at least the minimum or get an underflow. The minimum will be 0 on ALSA, PulseAudio, and Dummy, and will equal the maximum on CoreAudio and JACK. This ensures optimal behavior regardless of buffer size.
74 lines
1.6 KiB
C++
74 lines
1.6 KiB
C++
/*
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* Copyright (c) 2015 Andrew Kelley
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*
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* This file is part of libsoundio, which is MIT licensed.
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* See http://opensource.org/licenses/MIT
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*/
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#ifndef SOUNDIO_ALSA_HPP
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#define SOUNDIO_ALSA_HPP
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#include "soundio/soundio.h"
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#include "soundio/os.h"
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#include "atomics.hpp"
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#include <alsa/asoundlib.h>
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int soundio_alsa_init(struct SoundIoPrivate *si);
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struct SoundIoDeviceAlsa { };
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struct SoundIoAlsa {
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SoundIoOsMutex *mutex;
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SoundIoOsCond *cond;
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struct SoundIoOsThread *thread;
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atomic_flag abort_flag;
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int notify_fd;
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int notify_wd;
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atomic_bool have_devices_flag;
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int notify_pipe_fd[2];
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// this one is ready to be read with flush_events. protected by mutex
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struct SoundIoDevicesInfo *ready_devices_info;
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int shutdown_err;
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bool emitted_shutdown_cb;
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};
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struct SoundIoOutStreamAlsa {
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snd_pcm_t *handle;
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snd_pcm_chmap_t *chmap;
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int chmap_size;
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snd_pcm_uframes_t offset;
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snd_pcm_access_t access;
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int sample_buffer_size;
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char *sample_buffer;
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int poll_fd_count;
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struct pollfd *poll_fds;
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SoundIoOsThread *thread;
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atomic_flag thread_exit_flag;
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int period_size;
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int write_frame_count;
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SoundIoChannelArea areas[SOUNDIO_MAX_CHANNELS];
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};
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struct SoundIoInStreamAlsa {
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snd_pcm_t *handle;
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snd_pcm_chmap_t *chmap;
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int chmap_size;
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snd_pcm_uframes_t offset;
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snd_pcm_access_t access;
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int sample_buffer_size;
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char *sample_buffer;
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int poll_fd_count;
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struct pollfd *poll_fds;
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SoundIoOsThread *thread;
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atomic_flag thread_exit_flag;
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int period_size;
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int read_frame_count;
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SoundIoChannelArea areas[SOUNDIO_MAX_CHANNELS];
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};
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#endif
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