utils.h

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/* Simple Plugin API
 *
 * Copyright © 2019 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_DEVICE_UTILS_H
#define SPA_DEVICE_UTILS_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <spa/pod/builder.h>
#include <spa/monitor/device.h>
 
struct spa_result_device_params_data {
        struct spa_pod_builder *builder;
        struct spa_result_device_params data;
};
 
static inline void spa_result_func_device_params(void *data, int seq, int res,
                uint32_t type, 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);
}
 
static inline 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, };
        struct spa_hook listener = {{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 */