utils.h

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/* Simple Plugin API */
/* SPDX-FileCopyrightText: Copyright © 2019 Wim Taymans */
/* SPDX-License-Identifier: MIT */
 
#ifndef SPA_DEVICE_UTILS_H
#define SPA_DEVICE_UTILS_H
 
#include <spa/pod/builder.h>
#include <spa/monitor/device.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#ifndef SPA_API_DEVICE_UTILS
 #ifdef SPA_API_IMPL
  #define SPA_API_DEVICE_UTILS SPA_API_IMPL
 #else
  #define SPA_API_DEVICE_UTILS static inline
 #endif
#endif

 
struct spa_result_device_params_data {
        struct spa_pod_builder *builder;
        struct spa_result_device_params data;
};
 
SPA_API_DEVICE_UTILS void spa_result_func_device_params(void *data, int seq SPA_UNUSED, int res SPA_UNUSED,
                uint32_t type SPA_UNUSED, const void *result)
{
        struct spa_result_device_params_data *d =
                (struct spa_result_device_params_data *)data;
        const struct spa_result_device_params *r =
                (const struct spa_result_device_params *)result;
        uint32_t offset = d->builder->state.offset;
        if (spa_pod_builder_raw_padded(d->builder, r->param, SPA_POD_SIZE(r->param)) < 0)
                return;
        d->data.next = r->next;
        d->data.param = spa_pod_builder_deref(d->builder, offset);
}
 
SPA_API_DEVICE_UTILS int spa_device_enum_params_sync(struct spa_device *device,
                        uint32_t id, uint32_t *index,
                        const struct spa_pod *filter,
                        struct spa_pod **param,
                        struct spa_pod_builder *builder)
{
        struct spa_result_device_params_data data = { builder, {0}};
        struct spa_hook listener = {{0}, {0}, 0, 0};
        static const struct spa_device_events device_events = {
                .version = SPA_VERSION_DEVICE_EVENTS,
                .info = NULL,
                .result = spa_result_func_device_params,
        };
        int res;
 
        spa_device_add_listener(device, &listener, &device_events, &data);
        res = spa_device_enum_params(device, 0, id, *index, 1, filter);
        spa_hook_remove(&listener);
 
        if (data.data.param == NULL) {
                if (res > 0)
                        res = 0;
        } else {
                *index = data.data.next;
                *param = data.data.param;
                res = 1;
        }
        return res;
}
 
#define spa_device_emit(hooks,method,version,...)                               \
                spa_hook_list_call_simple(hooks, struct spa_device_events,      \
                                method, version, ##__VA_ARGS__)
 
#define spa_device_emit_info(hooks,i)           spa_device_emit(hooks,info, 0, i)
#define spa_device_emit_result(hooks,s,r,t,res) spa_device_emit(hooks,result, 0, s, r, t, res)
#define spa_device_emit_event(hooks,e)          spa_device_emit(hooks,event, 0, e)
#define spa_device_emit_object_info(hooks,id,i) spa_device_emit(hooks,object_info, 0, id, i)


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