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https://gitlab.freedesktop.org/pipewire/pipewire.git
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0343297257
Use a DLL to track the hardware pointer and use this to set the timer. Handle XRUN and recover.
195 lines
4.3 KiB
C
195 lines
4.3 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 <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/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 48000
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#define DEFAULT_CHANNELS 2
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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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struct spa_buffer *buf;
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struct spa_meta_header *h;
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#define BUFFER_FLAG_OUT (1<<0)
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uint32_t flags;
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struct spa_list link;
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};
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#define DLL_BW_MAX 0.256
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#define DLL_BW_MIN 0.05
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#define DLL_BW_PERIOD 4.0
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struct dll {
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double w1, w2;
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double base, t0, dt;
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double bw;
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int count;
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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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uint32_t seq;
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struct spa_log *log;
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struct spa_loop *main_loop;
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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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const struct spa_node_callbacks *callbacks;
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void *callbacks_data;
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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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struct dll dll;
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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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struct spa_port_info info;
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struct spa_io_buffers *io;
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struct spa_io_range *range;
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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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bool alsa_started;
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bool slaved;
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int threshold;
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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 last_time;
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uint64_t next_time;
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uint64_t underrun;
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double old_dt;
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double safety;
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};
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int
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spa_alsa_enum_format(struct state *state,
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uint32_t *index,
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const struct spa_pod *filter,
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struct spa_pod **result,
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struct spa_pod_builder *builder);
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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_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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static inline void dll_bandwidth(struct dll *dll, double bandwidth)
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{
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double w = 2 * M_PI * bandwidth;
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dll->w1 = w * M_SQRT2;
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dll->w2 = w * w;
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dll->bw = bandwidth;
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dll->base = dll->t0;
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}
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static inline void dll_init(struct dll *dll, double bandwidth)
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{
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dll->dt = 1.0;
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dll->count = 0;
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dll_bandwidth(dll, bandwidth);
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}
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static inline double dll_update(struct dll *dll, double tw, double period)
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{
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double e;
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if (dll->count++ == 0) {
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dll->t0 = dll->base = tw;
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} else {
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dll->t0 += dll->dt * period;
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e = (tw - dll->t0) * period;
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dll->t0 += dll->w1 * e;
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dll->dt += dll->w2 * e;
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}
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return dll->t0;
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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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