/*****************************************************************************

 * va.h: Video Acceleration API for avcodec

 *****************************************************************************

 * Copyright (C) 2009 Laurent Aimar

 *

 * Authors: Laurent Aimar <fenrir_AT_ videolan _DOT_ org>

 *

 * This program 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.

 *

 * This program 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 this program; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.

 *****************************************************************************/

#ifndef VLC_AVCODEC_VA_H

#define VLC_AVCODEC_VA_H 1

#include "avcommon_compat.h"

#include <libavutil/pixdesc.h>

typedef struct vlc_va_t vlc_va_t;

typedef struct vlc_decoder_device vlc_decoder_device;

typedef struct vlc_video_context vlc_video_context;

struct vlc_va_cfg

{

    /**

     * AVContext to set the hwaccel_context on.

     *

     * The VA can assume fields codec_id, coded_width, coded_height,

     * active_thread_type, thread_count, framerate, profile, refs (H264) and

     * hw_pix_fmt are set correctly */

    AVCodecContext *avctx;

    /** avcodec hardare PIX_FMT */

    enum AVPixelFormat hwfmt;

    /**  Description of the hardware fornat */

    const AVPixFmtDescriptor *desc;

    /** VLC format of the content to decode */

    const es_format_t *fmt_in;

    /** Decoder device that will be used to create the video context */

    vlc_decoder_device *dec_device;

    /**

     * Resulting Video format

     *

     * Valid, can be changed by the module to change the size or chroma.

     */

    video_format_t *video_fmt_out;

    /**

    * Pointer to the previous video context

    *

    * Only valid if use_hwframes is true and when recreating the va module.

    * This context can be re-used (held, and set to vctx_out) if the internal

    * format/size matches the new cfg.

    */

    vlc_video_context *vctx_prev;

    /**

     * Pointer to the used video context

     *

     * The video context must be allocated from the dec_device, filled and set

     * to this pointer.

     */

    vlc_video_context *vctx_out;

    /**

     * Indicate if the module is using the new AVHWFramesContext API

     *

     * False, by default, set to true if the module is using this API

     */

    bool use_hwframes;

    /**

     * Request more pictures

     *

     * 0 by default, set if from the module

     */

    unsigned extra_pictures;

};

struct vlc_va_operations {

    int (*get)(vlc_va_t *, picture_t *pic, AVCodecContext *ctx, AVFrame *frame);

    void (*close)(vlc_va_t *, AVCodecContext* ctx);

};

struct vlc_va_t {

    struct vlc_object_t obj;

    void *sys;

    const struct vlc_va_operations *ops;

};

typedef int (*vlc_va_open)(vlc_va_t *, struct vlc_va_cfg *cfg);

#define set_va_callback(activate, priority) \

    { \

        vlc_va_open open__ = activate; \

        (void) open__; \

        set_callback(activate) \

    } \

    set_capability( "hw decoder", priority )

/**

 * Determines whether the hardware acceleration PixelFormat can be used to

 * decode pixels.

 * @param hwfmt the hardware acceleration pixel format

 * @return true if the hardware acceleration should be supported

 */

bool vlc_va_MightDecode(enum AVPixelFormat hwfmt);

/**

 * Creates an accelerated video decoding back-end for libavcodec.

 * @param obj parent VLC object

 * @param cfg pointer to a configuration struct

 * @return a new VLC object on success, NULL on error.

 */

vlc_va_t *vlc_va_New(vlc_object_t *obj, struct vlc_va_cfg *cfg);

/**

 * Get a hardware video surface for a libavcodec frame.

 * The surface will be used as output for the hardware decoder, and possibly

 * also as a reference frame to decode other surfaces.

 *

 * The type of the surface depends on the hardware pixel format:

 * AV_PIX_FMT_D3D11VA_VLD - ID3D11VideoDecoderOutputView*

 * AV_PIX_FMT_DXVA2_VLD   - IDirect3DSurface9*

 * AV_PIX_FMT_VDPAU       - VdpVideoSurface

 * AV_PIX_FMT_VAAPI       - VASurfaceID

 *

 * @param pic pointer to VLC picture containing the surface [IN/OUT]

 * @param ctx pointer to the current AVCodecContext [IN]

 * @param frame pointer to the AVFrame [IN]

 *

 * @note This function needs not be reentrant.

 *

 * @return VLC_SUCCESS on success, otherwise an error code.

 */

static inline int vlc_va_Get(vlc_va_t *va, picture_t *pic, AVCodecContext *ctx,

                             AVFrame *frame)

{

    return va->ops->get(va, pic, ctx, frame);

}

Unexecuted instantiation: video.c:vlc_va_Get

Unexecuted instantiation: va.c:vlc_va_Get

/**

 * Destroys a libavcodec hardware acceleration back-end.

 * All allocated surfaces shall have been released beforehand.

 *

 * @param avctx pointer to the current AVCodecContext if it needs to be cleaned, NULL otherwise [IN]

 */

void vlc_va_Delete(vlc_va_t *, AVCodecContext * avctx);

#endif