pipewire/spa/include/spa/param/latency-utils.h

/* Simple Plugin API
 *
 * Copyright © 2021 Wim Taymans
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#ifndef SPA_PARAM_LATENCY_UTILS_H
#define SPA_PARAM_LATENCY_UTILS_H

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \addtogroup spa_param
 * \{
 */

#include <float.h>

#include <spa/pod/builder.h>
#include <spa/pod/parser.h>
#include <spa/param/param.h>

struct spa_latency_info {
	enum spa_direction direction;
	float min_quantum;
	float max_quantum;
	uint32_t min_rate;
	uint32_t max_rate;
	uint64_t min_ns;
	uint64_t max_ns;
};

#define SPA_LATENCY_INFO(dir,...) ((struct spa_latency_info) { .direction = (dir), ## __VA_ARGS__ })

static inline int
spa_latency_info_compare(const struct spa_latency_info *a, struct spa_latency_info *b)
{
	if (a->min_quantum == b->min_quantum &&
	    a->max_quantum == b->max_quantum &&
	    a->min_rate == b->min_rate &&
	    a->max_rate == b->max_rate &&
	    a->min_ns == b->min_ns &&
	    a->max_ns == b->max_ns)
		return 0;
	return 1;
}

static inline void
spa_latency_info_combine_start(struct spa_latency_info *info, enum spa_direction direction)
{
	*info = SPA_LATENCY_INFO(direction,
			.min_quantum = FLT_MAX,
			.max_quantum = 0.0f,
			.min_rate = UINT32_MAX,
			.max_rate = 0,
			.min_ns = UINT64_MAX,
			.max_ns = 0);
}
static inline void
spa_latency_info_combine_finish(struct spa_latency_info *info)
{
	if (info->min_quantum == FLT_MAX)
		info->min_quantum = 0;
	if (info->min_rate == UINT32_MAX)
		info->min_rate = 0;
	if (info->min_ns == UINT64_MAX)
		info->min_ns = 0;
}

static inline int
spa_latency_info_combine(struct spa_latency_info *info, const struct spa_latency_info *other)
{
	if (info->direction != other->direction)
		return -EINVAL;
	if (other->min_quantum < info->min_quantum)
		info->min_quantum = other->min_quantum;
	if (other->max_quantum > info->max_quantum)
		info->max_quantum = other->max_quantum;
	if (other->min_rate < info->min_rate)
		info->min_rate = other->min_rate;
	if (other->max_rate > info->max_rate)
		info->max_rate = other->max_rate;
	if (other->min_ns < info->min_ns)
		info->min_ns = other->min_ns;
	if (other->max_ns > info->max_ns)
		info->max_ns = other->max_ns;
	return 0;
}

static inline int
spa_latency_parse(const struct spa_pod *latency, struct spa_latency_info *info)
{
	int res;
	spa_zero(*info);
	if ((res = spa_pod_parse_object(latency,
			SPA_TYPE_OBJECT_ParamLatency, NULL,
			SPA_PARAM_LATENCY_direction, SPA_POD_Id(&info->direction),
			SPA_PARAM_LATENCY_minQuantum, SPA_POD_OPT_Float(&info->min_quantum),
			SPA_PARAM_LATENCY_maxQuantum, SPA_POD_OPT_Float(&info->max_quantum),
			SPA_PARAM_LATENCY_minRate, SPA_POD_OPT_Int(&info->min_rate),
			SPA_PARAM_LATENCY_maxRate, SPA_POD_OPT_Int(&info->max_rate),
			SPA_PARAM_LATENCY_minNs, SPA_POD_OPT_Long(&info->min_ns),
			SPA_PARAM_LATENCY_maxNs, SPA_POD_OPT_Long(&info->max_ns))) < 0)
		return res;
	info->direction = (enum spa_direction)(info->direction & 1);
	return 0;
}

static inline struct spa_pod *
spa_latency_build(struct spa_pod_builder *builder, uint32_t id, const struct spa_latency_info *info)
{
	return (struct spa_pod *)spa_pod_builder_add_object(builder,
			SPA_TYPE_OBJECT_ParamLatency, id,
			SPA_PARAM_LATENCY_direction, SPA_POD_Id(info->direction),
			SPA_PARAM_LATENCY_minQuantum, SPA_POD_Float(info->min_quantum),
			SPA_PARAM_LATENCY_maxQuantum, SPA_POD_Float(info->max_quantum),
			SPA_PARAM_LATENCY_minRate, SPA_POD_Int(info->min_rate),
			SPA_PARAM_LATENCY_maxRate, SPA_POD_Int(info->max_rate),
			SPA_PARAM_LATENCY_minNs, SPA_POD_Long(info->min_ns),
			SPA_PARAM_LATENCY_maxNs, SPA_POD_Long(info->max_ns));
}

struct spa_process_latency_info {
	float quantum;
	uint32_t rate;
	uint64_t ns;
};

#define SPA_PROCESS_LATENCY_INFO_INIT(...)	((struct spa_process_latency_info) { __VA_ARGS__ })

static inline int
spa_process_latency_parse(const struct spa_pod *latency, struct spa_process_latency_info *info)
{
	int res;
	spa_zero(*info);
	if ((res = spa_pod_parse_object(latency,
			SPA_TYPE_OBJECT_ParamProcessLatency, NULL,
			SPA_PARAM_PROCESS_LATENCY_quantum, SPA_POD_OPT_Float(&info->quantum),
			SPA_PARAM_PROCESS_LATENCY_rate, SPA_POD_OPT_Int(&info->rate),
			SPA_PARAM_PROCESS_LATENCY_ns, SPA_POD_OPT_Long(&info->ns))) < 0)
		return res;
	return 0;
}

static inline struct spa_pod *
spa_process_latency_build(struct spa_pod_builder *builder, uint32_t id,
		const struct spa_process_latency_info *info)
{
	return (struct spa_pod *)spa_pod_builder_add_object(builder,
			SPA_TYPE_OBJECT_ParamProcessLatency, id,
			SPA_PARAM_PROCESS_LATENCY_quantum, SPA_POD_Float(info->quantum),
			SPA_PARAM_PROCESS_LATENCY_rate, SPA_POD_Int(info->rate),
			SPA_PARAM_PROCESS_LATENCY_ns, SPA_POD_Long(info->ns));
}

static inline int
spa_process_latency_info_add(const struct spa_process_latency_info *process,
		struct spa_latency_info *info)
{
	info->min_quantum += process->quantum;
	info->max_quantum += process->quantum;
	info->min_rate += process->rate;
	info->max_rate += process->rate;
	info->min_ns += process->ns;
	info->max_ns += process->ns;
	return 0;
}

/**
 * \}
 */

#ifdef __cplusplus
}  /* extern "C" */
#endif

#endif /* SPA_PARAM_LATENCY_UTILS_H */