FFmpeg/libavcodec/vaapi.h

/*
 * Video Acceleration API (shared data between Libav and the video player)
 * HW decode acceleration for MPEG-2, MPEG-4, H.264 and VC-1
 *
 * Copyright (C) 2008-2009 Splitted-Desktop Systems
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_VAAPI_H
#define AVCODEC_VAAPI_H

/**
 * @file
 * @ingroup lavc_codec_hwaccel_vaapi
 * Public libavcodec VA API header.
 */

#include <stdint.h>

/**
 * @defgroup lavc_codec_hwaccel_vaapi VA API Decoding
 * @ingroup lavc_codec_hwaccel
 * @{
 */

/**
 * This structure is used to share data between the Libav library and
 * the client video application.
 * This shall be zero-allocated and available as
 * AVCodecContext.hwaccel_context. All user members can be set once
 * during initialization or through each AVCodecContext.get_buffer()
 * function call. In any case, they must be valid prior to calling
 * decoding functions.
 */
struct vaapi_context {
    /**
     * Window system dependent data
     *
     * - encoding: unused
     * - decoding: Set by user
     */
    void *display;

    /**
     * Configuration ID
     *
     * - encoding: unused
     * - decoding: Set by user
     */
    uint32_t config_id;

    /**
     * Context ID (video decode pipeline)
     *
     * - encoding: unused
     * - decoding: Set by user
     */
    uint32_t context_id;

    /**
     * VAPictureParameterBuffer ID
     *
     * - encoding: unused
     * - decoding: Set by libavcodec
     */
    uint32_t pic_param_buf_id;

    /**
     * VAIQMatrixBuffer ID
     *
     * - encoding: unused
     * - decoding: Set by libavcodec
     */
    uint32_t iq_matrix_buf_id;

    /**
     * VABitPlaneBuffer ID (for VC-1 decoding)
     *
     * - encoding: unused
     * - decoding: Set by libavcodec
     */
    uint32_t bitplane_buf_id;

    /**
     * Slice parameter/data buffer IDs
     *
     * - encoding: unused
     * - decoding: Set by libavcodec
     */
    uint32_t *slice_buf_ids;

    /**
     * Number of effective slice buffer IDs to send to the HW
     *
     * - encoding: unused
     * - decoding: Set by libavcodec
     */
    unsigned int n_slice_buf_ids;

    /**
     * Size of pre-allocated slice_buf_ids
     *
     * - encoding: unused
     * - decoding: Set by libavcodec
     */
    unsigned int slice_buf_ids_alloc;

    /**
     * Pointer to VASliceParameterBuffers
     *
     * - encoding: unused
     * - decoding: Set by libavcodec
     */
    void *slice_params;

    /**
     * Size of a VASliceParameterBuffer element
     *
     * - encoding: unused
     * - decoding: Set by libavcodec
     */
    unsigned int slice_param_size;

    /**
     * Size of pre-allocated slice_params
     *
     * - encoding: unused
     * - decoding: Set by libavcodec
     */
    unsigned int slice_params_alloc;

    /**
     * Number of slices currently filled in
     *
     * - encoding: unused
     * - decoding: Set by libavcodec
     */
    unsigned int slice_count;

    /**
     * Pointer to slice data buffer base
     * - encoding: unused
     * - decoding: Set by libavcodec
     */
    const uint8_t *slice_data;

    /**
     * Current size of slice data
     *
     * - encoding: unused
     * - decoding: Set by libavcodec
     */
    uint32_t slice_data_size;
};

/* @} */

#endif /* AVCODEC_VAAPI_H */