libavcodec/vda.h

/*
 * VDA HW acceleration
 *
 * copyright (c) 2011 Sebastien Zwickert
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_VDA_H
#define AVCODEC_VDA_H

#include <pthread.h>
#include <stdint.h>

// emmintrin.h is unable to compile with -std=c99 -Werror=missing-prototypes
// http://openradar.appspot.com/8026390
#undef __GNUC_STDC_INLINE__

#define Picture QuickdrawPicture
#include <VideoDecodeAcceleration/VDADecoder.h>
#undef Picture

/**
 *  This structure is used to store a decoded frame information and data.
 */
typedef struct {
    /**
    * The PTS of the frame.
    *
    * - encoding: unused
    * - decoding: Set/Unset by libavcodec.
    */
    int64_t             pts;

    /**
    * The CoreVideo buffer that contains the decoded data.
    *
    * - encoding: unused
    * - decoding: Set/Unset by libavcodec.
    */
    CVPixelBufferRef    cv_buffer;

    /**
    * A pointer to the next frame.
    *
    * - encoding: unused
    * - decoding: Set/Unset by libavcodec.
    */
    struct vda_frame    *next_frame;
} vda_frame;

/**
 * This structure is used to provide the necessary configurations and data
 * to the VDA FFmpeg HWAccel implementation.
 *
 * The application must make it available as AVCodecContext.hwaccel_context.
 */
struct vda_context {
    /**
    * VDA decoder object.
    *
    * - encoding: unused
    * - decoding: Set/Unset by libavcodec.
    */
    VDADecoder          decoder;

    /**
    * VDA frames queue ordered by presentation timestamp.
    *
    * - encoding: unused
    * - decoding: Set/Unset by libavcodec.
    */
    vda_frame           *queue;

    /**
    * Mutex for locking queue operations.
    *
    * - encoding: unused
    * - decoding: Set/Unset by libavcodec.
    */
    pthread_mutex_t     queue_mutex;

    /**
    * The frame width.
    *
    * - encoding: unused
    * - decoding: Set/Unset by user.
    */
    int                 width;

    /**
    * The frame height.
    *
    * - encoding: unused
    * - decoding: Set/Unset by user.
    */
    int                 height;

    /**
    * The frame format.
    *
    * - encoding: unused
    * - decoding: Set/Unset by user.
    */
    int                 format;

    /**
    * The pixel format for output image buffers.
    *
    * - encoding: unused
    * - decoding: Set/Unset by user.
    */
    OSType              cv_pix_fmt_type;

    /**
    * The current bitstream buffer.
    *
    * - encoding: unused
    * - decoding: Set/Unset by libavcodec.
    */
    uint8_t             *bitstream;

    /**
    * The current size of the bitstream.
    *
    * - encoding: unused
    * - decoding: Set/Unset by libavcodec.
    */
    int                 bitstream_size;

    /**
    * The reference size used for fast reallocation.
    *
    * - encoding: unused
    * - decoding: Set/Unset by libavcodec.
    */
    int                 ref_size;
};

/** Create the video decoder. */
int ff_vda_create_decoder(struct vda_context *vda_ctx,
                          uint8_t *extradata,
                          int extradata_size);

/** Destroy the video decoder. */
int ff_vda_destroy_decoder(struct vda_context *vda_ctx);

/** Return the top frame of the queue. */
vda_frame *ff_vda_queue_pop(struct vda_context *vda_ctx);

/** Release the given frame. */
void ff_vda_release_vda_frame(vda_frame *frame);

#endif /* AVCODEC_VDA_H */