source: mainline/uspace/srv/audio/hound/connection.c@ 38d150e

/*
 * Copyright (c) 2013 Jan Vesely
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup audio
 * @brief HelenOS sound server
 * @{
 */
/** @file
 */

#include <errno.h>
#include <stdlib.h>

#include "log.h"
#include "connection.h"

/**
 * Create connection between source and sink.
 * @param source Valid source structure.
 * @param sink Valid sink structure.
 * @return pointer to a valid connection structure, NULL on failure.
 *
 * Reports new connection to both the source and sink.
 */
connection_t *connection_create(audio_source_t *source, audio_sink_t *sink)
{
        assert(source);
        assert(sink);
        connection_t *conn = malloc(sizeof(connection_t));
        if (conn) {
                audio_pipe_init(&conn->fifo);
                link_initialize(&conn->source_link);
                link_initialize(&conn->sink_link);
                link_initialize(&conn->hound_link);
                conn->sink = sink;
                conn->source = source;
                list_append(&conn->source_link, &source->connections);
                list_append(&conn->sink_link, &sink->connections);
                audio_sink_set_format(sink, audio_source_format(source));
                if (source->connection_change)
                        source->connection_change(source, true);
                if (sink->connection_change)
                        sink->connection_change(sink, true);
                log_debug("CONNECTED: %s -> %s", source->name, sink->name);
        }
        return conn;
}

/**
 * Destroy existing connection
 * @param connection The connection to destroy.
 *
 * Disconnects from both the source and the sink.
 */
void connection_destroy(connection_t *connection)
{
        assert(connection);
        assert(!link_in_use(&connection->hound_link));
        list_remove(&connection->source_link);
        list_remove(&connection->sink_link);
        if (connection->sink && connection->sink->connection_change)
                connection->sink->connection_change(connection->sink, false);
        if (connection->source && connection->source->connection_change)
                connection->source->connection_change(connection->source, false);
        audio_pipe_fini(&connection->fifo);
        log_debug("DISCONNECTED: %s -> %s",
            connection->source->name, connection->sink->name);
        free(connection);
}

/**
 * Update and mix data provided by the source.
 * @param connection the connection to add.
 * @param data Destination audio buffer.
 * @param size size of the destination audio buffer.
 * @param format format of the destination audio buffer.
 */
ssize_t connection_add_source_data(connection_t *connection, void *data,
    size_t size, pcm_format_t format)
{
        assert(connection);
        if (!data)
                return EBADMEM;
        const size_t needed_frames = pcm_format_size_to_frames(size, &format);
        if (needed_frames > audio_pipe_frames(&connection->fifo) &&
            connection->source->update_available_data) {
                log_debug("Asking source to provide more data");
                connection->source->update_available_data(
                    connection->source, size);
        }
        log_verbose("Data available after update: %zu",
            audio_pipe_bytes(&connection->fifo));
        ssize_t ret =
            audio_pipe_mix_data(&connection->fifo, data, size, &format);
        if (ret != (ssize_t)size)
                log_warning("Connection failed to provide enough data %zd/%zu",
                    ret, size);
        return ret > 0 ? EOK : ret;
}
/**
 * Add new data to the connection buffer.
 * @param connection Target conneciton.
 * @aparam adata Reference counted audio data buffer.
 * @return Error code.
 */
int connection_push_data(connection_t *connection,
    audio_data_t *adata)
{
        assert(connection);
        assert(adata);
        const int ret = audio_pipe_push(&connection->fifo, adata);
        if (ret == EOK && connection->sink->data_available)
                connection->sink->data_available(connection->sink);
        return ret;
}

/**
 * @}
 */