source: mainline/uspace/srv/audio/hound/audio_sink.c@ 57e8b3b

/*
 * Copyright (c) 2012 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 <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <str.h>
#include <str_error.h>

#include "audio_sink.h"
#include "log.h"


int audio_sink_init(audio_sink_t *sink, const char *name,
    void *private_data, int (*connection_change)(audio_sink_t *, bool),
    const audio_format_t *f)
{
        assert(sink);
        if (!name) {
                log_debug("Incorrect parameters.");
                return EINVAL;
        }
        link_initialize(&sink->link);
        list_initialize(&sink->sources);
        sink->name = str_dup(name);
        sink->private_data = private_data;
        sink->format = *f;
        sink->connection_change = connection_change;
        log_verbose("Initialized sink (%p) '%s'", sink, sink->name);
        return EOK;
}

void audio_sink_fini(audio_sink_t *sink)
{
        assert(sink);
        assert(!sink->private_data);
        free(sink->name);
        sink->name = NULL;
}


int audio_sink_add_source(audio_sink_t *sink, audio_source_t *source)
{
        assert(sink);
        assert(source);
        assert_link_not_used(&source->link);
        list_append(&source->link, &sink->sources);

        const audio_format_t old_format = sink->format;

        /* The first source for me */
        if (list_count(&sink->sources) == 1) {
                /* Set audio format according to the first source */
                if (audio_format_is_any(&sink->format)) {
                        /* Source does not care */
                        if (audio_format_is_any(&source->format)) {
                                log_verbose("Set default format for sink %s.",
                                    sink->name);
                                sink->format = AUDIO_FORMAT_DEFAULT;
                        } else {
                                log_verbose("Set format based on the first "
                                    "source(%s): %u channel(s), %uHz, %s for "
                                    "sink %s.", source->name,
                                    source->format.channels,
                                    source->format.sampling_rate,
                                    pcm_sample_format_str(
                                        source->format.sample_format),
                                    sink->name);
                                sink->format = source->format;
                        }
                }
        }

        audio_source_connected(source, sink);

        if (sink->connection_change) {
                log_verbose("Calling connection change");
                const int ret = sink->connection_change(sink, true);
                if (ret != EOK) {
                        log_debug("Connection hook failed.");
                        audio_source_connected(source, NULL);
                        list_remove(&source->link);
                        sink->format = old_format;
                        return ret;
                }
        }
        log_verbose("Connected source '%s' to sink '%s'",
            source->name, sink->name);

        return EOK;
}

int audio_sink_remove_source(audio_sink_t *sink, audio_source_t *source)
{
        assert(sink);
        assert(source);
        assert(list_member(&source->link, &sink->sources));
        list_remove(&source->link);
        if (sink->connection_change) {
                const int ret = sink->connection_change(sink, false);
                if (ret != EOK) {
                        log_debug("Connected hook failed.");
                        list_append(&source->link, &sink->sources);
                        return ret;
                }
        }
        audio_source_connected(source, NULL);
        return EOK;
}


void audio_sink_mix_inputs(audio_sink_t *sink, void* dest, size_t size)
{
        assert(sink);
        assert(dest);

        bzero(dest, size);
        list_foreach(sink->sources, it) {
                audio_source_t *source = audio_source_list_instance(it);
                const int ret =
                    audio_source_add_self(source, dest, size, &sink->format);
                if (ret != EOK) {
                        log_warning("Failed to mix source %s: %s",
                            source->name, str_error(ret));
                }
        }
}


/**
 * @}
 */