source: mainline/uspace/srv/audio/hound/audio_data.h

/*
 * 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
 */

#ifndef AUDIO_DATA_H_
#define AUDIO_DATA_H_

#include <adt/list.h>
#include <refcount.h>
#include <errno.h>
#include <fibril_synch.h>
#include <pcm/format.h>

/** Reference counted audio buffer */
typedef struct {
        /** Audio data */
        void *data;
        /** Size of the buffer pointer to by data */
        size_t size;
        /** Format of the audio data */
        pcm_format_t format;
        /** Reference counter */
        atomic_refcount_t refcount;
} audio_data_t;

/** Audio data pipe structure */
typedef struct {
        /** List of audio data buffers */
        list_t list;
        /** Total size of all buffers */
        size_t bytes;
        /** Total frames stored in all buffers */
        size_t frames;
        /** List access synchronization */
        fibril_mutex_t guard;
} audio_pipe_t;

audio_data_t *audio_data_create(void *data, size_t size,
    pcm_format_t format);
void audio_data_addref(audio_data_t *adata);
void audio_data_unref(audio_data_t *adata);

void audio_pipe_init(audio_pipe_t *pipe);
void audio_pipe_fini(audio_pipe_t *pipe);

errno_t audio_pipe_push(audio_pipe_t *pipe, audio_data_t *data);
audio_data_t *audio_pipe_pop(audio_pipe_t *pipe);

size_t audio_pipe_mix_data(audio_pipe_t *pipe, void *buffer, size_t size,
    const pcm_format_t *f);

/**
 * Total bytes getter.
 * @param pipe The audio pipe.
 * @return Total size of buffer stored in the pipe.
 */
static inline size_t audio_pipe_bytes(audio_pipe_t *pipe)
{
        assert(pipe);
        return pipe->bytes;
}

/**
 * Total bytes getter.
 * @param pipe The audio pipe.
 * @return Total number of frames stored in the pipe.
 */
static inline size_t audio_pipe_frames(audio_pipe_t *pipe)
{
        assert(pipe);
        return pipe->frames;
}

/**
 * Push data form buffer directly to pipe.
 * @param pipe The target pipe.
 * @param data audio buffer.
 * @param size size of the @p data buffer
 * @param f format of the audio data.
 * @return Error code.
 *
 * Reference counted buffer is created automatically.
 */
static inline errno_t audio_pipe_push_data(audio_pipe_t *pipe,
    void *data, size_t size, pcm_format_t f)
{
        audio_data_t *adata = audio_data_create(data, size, f);
        if (adata) {
                const errno_t ret = audio_pipe_push(pipe, adata);
                audio_data_unref(adata);
                return ret;
        }
        return ENOMEM;
}

#endif

/**
 * @}
 */