mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
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166 lines
3.9 KiB
C
166 lines
3.9 KiB
C
/* Spa ALSA Sink
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*
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* Copyright © 2018 Wim Taymans
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef SPA_ALSA_UTILS_H
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#define SPA_ALSA_UTILS_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stddef.h>
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#include <math.h>
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#include <alsa/asoundlib.h>
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#include <spa/support/loop.h>
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#include <spa/support/log.h>
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#include <spa/utils/list.h>
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#include <spa/node/node.h>
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#include <spa/node/utils.h>
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#include <spa/node/io.h>
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#include <spa/param/param.h>
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#include <spa/param/audio/format-utils.h>
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#define DEFAULT_RATE 48000u
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#define DEFAULT_CHANNELS 2u
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struct props {
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char device[64];
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char device_name[128];
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char card_name[128];
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uint32_t min_latency;
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uint32_t max_latency;
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};
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#define MAX_BUFFERS 32
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struct buffer {
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uint32_t id;
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#define BUFFER_FLAG_OUT (1<<0)
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uint32_t flags;
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struct spa_buffer *buf;
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struct spa_meta_header *h;
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struct spa_list link;
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};
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#define BW_MAX 0.128
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#define BW_MED 0.064
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#define BW_MIN 0.016
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#define BW_PERIOD (3 * SPA_NSEC_PER_SEC)
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struct state {
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struct spa_handle handle;
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struct spa_node node;
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struct spa_log *log;
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struct spa_system *data_system;
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struct spa_loop *data_loop;
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snd_pcm_stream_t stream;
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snd_output_t *output;
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struct spa_hook_list hooks;
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struct spa_callbacks callbacks;
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uint64_t info_all;
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struct spa_node_info info;
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struct spa_param_info params[8];
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struct props props;
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bool opened;
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snd_pcm_t *hndl;
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bool have_format;
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struct spa_audio_info current_format;
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snd_pcm_uframes_t buffer_frames;
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snd_pcm_uframes_t period_frames;
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snd_pcm_format_t format;
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int rate;
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int channels;
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size_t frame_size;
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uint64_t port_info_all;
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struct spa_port_info port_info;
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struct spa_param_info port_params[8];
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struct spa_io_buffers *io;
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struct spa_io_clock *clock;
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struct spa_io_position *position;
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struct spa_io_sequence *notify;
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struct buffer buffers[MAX_BUFFERS];
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unsigned int n_buffers;
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struct spa_list free;
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struct spa_list ready;
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size_t ready_offset;
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bool started;
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struct spa_source source;
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int timerfd;
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uint32_t threshold;
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uint32_t last_threshold;
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uint64_t last_position;
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unsigned int alsa_started:1;
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unsigned int alsa_sync:1;
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unsigned int slaved:1;
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snd_htimestamp_t now;
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int64_t sample_count;
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int64_t sample_time;
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uint64_t next_time;
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uint64_t base_time;
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uint64_t underrun;
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double safety;
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double bw;
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double z1, z2, z3;
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double w0, w1, w2;
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};
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int
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spa_alsa_enum_format(struct state *state, int seq,
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uint32_t start, uint32_t num,
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const struct spa_pod *filter);
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int spa_alsa_set_format(struct state *state, struct spa_audio_info *info, uint32_t flags);
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int spa_alsa_start(struct state *state);
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int spa_alsa_reslave(struct state *state);
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int spa_alsa_pause(struct state *state);
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int spa_alsa_close(struct state *state);
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int spa_alsa_write(struct state *state, snd_pcm_uframes_t silence);
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int spa_alsa_read(struct state *state, snd_pcm_uframes_t silence);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* SPA_ALSA_UTILS_H */
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