tor-browser

The Tor Browser
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vda.h (3580B)

      1 /*
      2 * VDA HW acceleration
      3 *
      4 * copyright (c) 2011 Sebastien Zwickert
      5 *
      6 * This file is part of Libav.
      7 *
      8 * Libav is free software; you can redistribute it and/or
      9 * modify it under the terms of the GNU Lesser General Public
     10 * License as published by the Free Software Foundation; either
     11 * version 2.1 of the License, or (at your option) any later version.
     12 *
     13 * Libav is distributed in the hope that it will be useful,
     14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16 * Lesser General Public License for more details.
     17 *
     18 * You should have received a copy of the GNU Lesser General Public
     19 * License along with Libav; if not, write to the Free Software
     20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     21 */
     22 
     23 #ifndef AVCODEC_VDA_H
     24 #define AVCODEC_VDA_H
     25 
     26 #include <pthread.h>
     27 #include <stdint.h>
     28 
     29 // emmintrin.h is unable to compile with -std=c99 -Werror=missing-prototypes
     30 // http://openradar.appspot.com/8026390
     31 #undef __GNUC_STDC_INLINE__
     32 
     33 #define Picture QuickdrawPicture
     34 #include <VideoDecodeAcceleration/VDADecoder.h>
     35 #undef Picture
     36 
     37 /**
     38 *  This structure is used to store a decoded frame information and data.
     39 */
     40 typedef struct vda_frame {
     41    /**
     42    * The PTS of the frame.
     43    *
     44    * - encoding: unused
     45    * - decoding: Set/Unset by libavcodec.
     46    */
     47    int64_t             pts;
     48 
     49    /**
     50    * The CoreVideo buffer that contains the decoded data.
     51    *
     52    * - encoding: unused
     53    * - decoding: Set/Unset by libavcodec.
     54    */
     55    CVPixelBufferRef    cv_buffer;
     56 
     57    /**
     58    * A pointer to the next frame.
     59    *
     60    * - encoding: unused
     61    * - decoding: Set/Unset by libavcodec.
     62    */
     63    struct vda_frame    *next_frame;
     64 } vda_frame;
     65 
     66 /**
     67 * This structure is used to provide the necessary configurations and data
     68 * to the VDA Libav HWAccel implementation.
     69 *
     70 * The application must make it available as AVCodecContext.hwaccel_context.
     71 */
     72 struct vda_context {
     73    /**
     74    * VDA decoder object.
     75    *
     76    * - encoding: unused
     77    * - decoding: Set/Unset by libavcodec.
     78    */
     79    VDADecoder          decoder;
     80 
     81    /**
     82    * VDA frames queue ordered by presentation timestamp.
     83    *
     84    * - encoding: unused
     85    * - decoding: Set/Unset by libavcodec.
     86    */
     87    vda_frame           *queue;
     88 
     89    /**
     90    * Mutex for locking queue operations.
     91    *
     92    * - encoding: unused
     93    * - decoding: Set/Unset by libavcodec.
     94    */
     95    pthread_mutex_t     queue_mutex;
     96 
     97    /**
     98    * The frame width.
     99    *
    100    * - encoding: unused
    101    * - decoding: Set/Unset by user.
    102    */
    103    int                 width;
    104 
    105    /**
    106    * The frame height.
    107    *
    108    * - encoding: unused
    109    * - decoding: Set/Unset by user.
    110    */
    111    int                 height;
    112 
    113    /**
    114    * The frame format.
    115    *
    116    * - encoding: unused
    117    * - decoding: Set/Unset by user.
    118    */
    119    int                 format;
    120 
    121    /**
    122    * The pixel format for output image buffers.
    123    *
    124    * - encoding: unused
    125    * - decoding: Set/Unset by user.
    126    */
    127    OSType              cv_pix_fmt_type;
    128 };
    129 
    130 /** Create the video decoder. */
    131 int ff_vda_create_decoder(struct vda_context *vda_ctx,
    132                          uint8_t *extradata,
    133                          int extradata_size);
    134 
    135 /** Destroy the video decoder. */
    136 int ff_vda_destroy_decoder(struct vda_context *vda_ctx);
    137 
    138 /** Return the top frame of the queue. */
    139 vda_frame *ff_vda_queue_pop(struct vda_context *vda_ctx);
    140 
    141 /** Release the given frame. */
    142 void ff_vda_release_vda_frame(vda_frame *frame);
    143 
    144 #endif /* AVCODEC_VDA_H */