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_NODE_UTILS_H
#define SPA_NODE_UTILS_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <spa/pod/builder.h>
 
#include <spa/node/node.h>
 
struct spa_result_node_params_data {
        struct spa_pod_builder *builder;
        struct spa_result_node_params data;
};
 
static inline void spa_result_func_node_params(void *data,
                int seq, int res, uint32_t type, const void *result)
{
        struct spa_result_node_params_data *d =
                (struct spa_result_node_params_data *) data;
        const struct spa_result_node_params *r =
                (const struct spa_result_node_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_node_enum_params_sync(struct spa_node *node,
                        uint32_t id, uint32_t *index,
                        const struct spa_pod *filter,
                        struct spa_pod **param,
                        struct spa_pod_builder *builder)
{
        struct spa_result_node_params_data data = { builder, };
        struct spa_hook listener = {{0}};
        static const struct spa_node_events node_events = {
                .version = SPA_VERSION_NODE_EVENTS,
                .info = NULL,
                .port_info = NULL,
                .result = spa_result_func_node_params,
        };
        int res;
 
        res = spa_node_add_listener(node, &listener, &node_events, &data);
        if (res >= 0) {
                res = spa_node_enum_params(node, 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;
}
 
static inline int spa_node_port_enum_params_sync(struct spa_node *node,
                        enum spa_direction direction, uint32_t port_id,
                        uint32_t id, uint32_t *index,
                        const struct spa_pod *filter,
                        struct spa_pod **param,
                        struct spa_pod_builder *builder)
{
        struct spa_result_node_params_data data = { builder, };
        struct spa_hook listener = {{0}};
        static const struct spa_node_events node_events = {
                .version = SPA_VERSION_NODE_EVENTS,
                .info = NULL,
                .port_info = NULL,
                .result = spa_result_func_node_params,
        };
        int res;
 
        res = spa_node_add_listener(node, &listener, &node_events, &data);
        if (res >= 0) {
                res = spa_node_port_enum_params(node, 0, direction, port_id,
                                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_node_emit(hooks,method,version,...)                                 \
                spa_hook_list_call_simple(hooks, struct spa_node_events,        \
                                method, version, ##__VA_ARGS__)
 
#define spa_node_emit_info(hooks,...)           spa_node_emit(hooks,info, 0, __VA_ARGS__)
#define spa_node_emit_port_info(hooks,...)      spa_node_emit(hooks,port_info, 0, __VA_ARGS__)
#define spa_node_emit_result(hooks,...)         spa_node_emit(hooks,result, 0, __VA_ARGS__)
#define spa_node_emit_event(hooks,...)          spa_node_emit(hooks,event, 0, __VA_ARGS__)
 
 
#define spa_node_call(callbacks,method,version,...)                     \
({                                                                      \
        int _res = -ENOTSUP;                                                    \
        spa_callbacks_call_res(callbacks, struct spa_node_callbacks,    \
                        _res, method, version, ##__VA_ARGS__);          \
        _res;                                                           \
})
 
#define spa_node_call_ready(hook,...)           spa_node_call(hook, ready, 0, __VA_ARGS__)
#define spa_node_call_reuse_buffer(hook,...)    spa_node_call(hook, reuse_buffer, 0, __VA_ARGS__)
#define spa_node_call_xrun(hook,...)            spa_node_call(hook, xrun, 0, __VA_ARGS__)
 
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* SPA_NODE_UTILS_H */