mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
synced 2025-10-29 05:40:27 -04:00
8630b8846c
Use half of the configured quantum as the period size in batch mode. This gives lower latency for USB devices depending on the quantum.
331 lines
8.2 KiB
C
331 lines
8.2 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 <alsa/use-case.h>
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#include <spa/support/plugin.h>
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#include <spa/support/loop.h>
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#include <spa/utils/list.h>
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#include <spa/utils/json.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/debug/types.h>
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#include <spa/param/param.h>
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#include <spa/param/latency-utils.h>
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#include <spa/param/audio/format-utils.h>
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#include "alsa.h"
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#include "dll.h"
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#define MIN_LATENCY 16
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#define MAX_LATENCY 8192
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#define DEFAULT_PERIOD 1024u
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#define DEFAULT_RATE 48000u
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#define DEFAULT_CHANNELS 2u
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#define DEFAULT_USE_CHMAP false
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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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bool use_chmap;
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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 channel_map {
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uint32_t channels;
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uint32_t pos[SPA_AUDIO_MAX_CHANNELS];
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};
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struct card {
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struct spa_list link;
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int ref;
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uint32_t index;
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snd_use_case_mgr_t *ucm;
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char *ucm_prefix;
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int format_ref;
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uint32_t rate;
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};
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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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int card_index;
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struct card *card;
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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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#define NODE_PropInfo 0
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#define NODE_Props 1
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#define NODE_IO 2
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#define NODE_ProcessLatency 3
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#define N_NODE_PARAMS 4
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struct spa_param_info params[N_NODE_PARAMS];
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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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uint32_t default_period_size;
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uint32_t default_headroom;
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uint32_t default_start_delay;
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uint32_t default_format;
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unsigned int default_channels;
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unsigned int default_rate;
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struct channel_map default_pos;
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unsigned int disable_mmap;
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unsigned int disable_batch;
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char clock_name[64];
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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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int blocks;
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uint32_t rate_denom;
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uint32_t delay;
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uint32_t read_size;
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uint64_t port_info_all;
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struct spa_port_info port_info;
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#define PORT_EnumFormat 0
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#define PORT_Meta 1
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#define PORT_IO 2
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#define PORT_Format 3
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#define PORT_Buffers 4
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#define PORT_Latency 5
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#define N_PORT_PARAMS 6
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struct spa_param_info port_params[N_PORT_PARAMS];
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enum spa_direction port_direction;
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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_rate_match *rate_match;
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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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uint32_t headroom;
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uint32_t start_delay;
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uint32_t duration;
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uint32_t last_duration;
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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 alsa_recovering:1;
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unsigned int following:1;
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unsigned int matching:1;
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unsigned int resample:1;
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unsigned int use_mmap:1;
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unsigned int planar:1;
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unsigned int freewheel:1;
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unsigned int open_ucm:1;
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unsigned int is_iec958:1;
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unsigned int is_hdmi:1;
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unsigned int multi_rate:1;
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uint64_t iec958_codecs;
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int64_t sample_count;
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int64_t sample_time;
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uint64_t current_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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struct spa_dll dll;
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double max_error;
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struct spa_latency_info latency[2];
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struct spa_process_latency_info process_latency;
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};
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struct spa_pod *spa_alsa_enum_propinfo(struct state *state,
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uint32_t idx, struct spa_pod_builder *b);
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int spa_alsa_add_prop_params(struct state *state, struct spa_pod_builder *b);
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int spa_alsa_parse_prop_params(struct state *state, struct spa_pod *params);
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int 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_init(struct state *state, const struct spa_dict *info);
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int spa_alsa_clear(struct state *state);
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int spa_alsa_open(struct state *state, const char *params);
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int spa_alsa_start(struct state *state);
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int spa_alsa_reassign_follower(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);
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int spa_alsa_read(struct state *state);
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int spa_alsa_skip(struct state *state);
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void spa_alsa_recycle_buffer(struct state *state, uint32_t buffer_id);
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static inline uint32_t spa_alsa_format_from_name(const char *name, size_t len)
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{
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int i;
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for (i = 0; spa_type_audio_format[i].name; i++) {
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if (strncmp(name, spa_debug_type_short_name(spa_type_audio_format[i].name), len) == 0)
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return spa_type_audio_format[i].type;
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}
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return SPA_AUDIO_FORMAT_UNKNOWN;
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}
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static inline uint32_t spa_alsa_channel_from_name(const char *name)
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{
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int i;
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for (i = 0; spa_type_audio_channel[i].name; i++) {
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if (strcmp(name, spa_debug_type_short_name(spa_type_audio_channel[i].name)) == 0)
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return spa_type_audio_channel[i].type;
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}
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return SPA_AUDIO_CHANNEL_UNKNOWN;
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}
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static inline void spa_alsa_parse_position(struct channel_map *map, const char *val, size_t len)
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{
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struct spa_json it[2];
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char v[256];
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spa_json_init(&it[0], val, len);
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if (spa_json_enter_array(&it[0], &it[1]) <= 0)
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spa_json_init(&it[1], val, len);
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map->channels = 0;
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while (spa_json_get_string(&it[1], v, sizeof(v)) > 0 &&
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map->channels < SPA_AUDIO_MAX_CHANNELS) {
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map->pos[map->channels++] = spa_alsa_channel_from_name(v);
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}
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}
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static inline uint32_t spa_alsa_iec958_codec_from_name(const char *name)
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{
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int i;
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for (i = 0; spa_type_audio_iec958_codec[i].name; i++) {
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if (strcmp(name, spa_debug_type_short_name(spa_type_audio_iec958_codec[i].name)) == 0)
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return spa_type_audio_iec958_codec[i].type;
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}
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return SPA_AUDIO_IEC958_CODEC_UNKNOWN;
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}
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static inline void spa_alsa_parse_iec958_codecs(uint64_t *codecs, const char *val, size_t len)
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{
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struct spa_json it[2];
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char v[256];
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spa_json_init(&it[0], val, len);
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if (spa_json_enter_array(&it[0], &it[1]) <= 0)
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spa_json_init(&it[1], val, len);
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*codecs = 0;
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while (spa_json_get_string(&it[1], v, sizeof(v)) > 0)
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*codecs |= 1ULL << spa_alsa_iec958_codec_from_name(v);
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}
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static inline uint32_t spa_alsa_get_iec958_codecs(struct state *state, uint32_t *codecs,
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uint32_t max_codecs)
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{
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uint64_t mask = state->iec958_codecs;
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uint32_t i = 0, j = 0;
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if (!(state->is_iec958 || state->is_hdmi))
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return 0;
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while (mask && i < max_codecs) {
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if (mask & 1)
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codecs[i++] = j;
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mask >>= 1;
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j++;
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}
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return i;
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}
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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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