libavcodec/threadframe.h

   1 /*
   2  * Copyright (c) 2022 Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef AVCODEC_THREADFRAME_H
  22 #define AVCODEC_THREADFRAME_H
  23
  24 #include "libavutil/frame.h"
  25 #include "avcodec.h"
  26
  27 typedef struct ThreadFrame {
  28     AVFrame *f;
  29     AVCodecContext *owner[2];
  30     // progress->data is an array of 2 ints holding progress for top/bottom
  31     // fields
  32     AVBufferRef *progress;
  33 } ThreadFrame;
  34
  35 /**
  36  * Notify later decoding threads when part of their reference picture is ready.
  37  * Call this when some part of the picture is finished decoding.
  38  * Later calls with lower values of progress have no effect.
  39  *
  40  * @param f The picture being decoded.
  41  * @param progress Value, in arbitrary units, of how much of the picture has decoded.
  42  * @param field The field being decoded, for field-picture codecs.
  43  * 0 for top field or frame pictures, 1 for bottom field.
  44  */
  45 void ff_thread_report_progress(ThreadFrame *f, int progress, int field);
  46
  47 /**
  48  * Wait for earlier decoding threads to finish reference pictures.
  49  * Call this before accessing some part of a picture, with a given
  50  * value for progress, and it will return after the responsible decoding
  51  * thread calls ff_thread_report_progress() with the same or
  52  * higher value for progress.
  53  *
  54  * @param f The picture being referenced.
  55  * @param progress Value, in arbitrary units, to wait for.
  56  * @param field The field being referenced, for field-picture codecs.
  57  * 0 for top field or frame pictures, 1 for bottom field.
  58  */
  59 void ff_thread_await_progress(ThreadFrame *f, int progress, int field);
  60
  61 /**
  62  * Wrapper around ff_get_buffer() for frame-multithreaded codecs.
  63  * Call this function instead of ff_get_buffer() if you might need
  64  * to wait for progress on this frame.
  65  * Cannot be called after the codec has called ff_thread_finish_setup().
  66  *
  67  * @param avctx The current context.
  68  * @param f The frame to write into.
  69  * @note: It is fine to call this with codecs that do not support
  70  *        frame threading.
  71  */
  72 int ff_thread_get_ext_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags);
  73
  74 /**
  75  * Unref a ThreadFrame.
  76  *
  77  * This is basically a wrapper around av_frame_unref() and should
  78  * be called instead of it.
  79  *
  80  * @param avctx The current context.
  81  * @param f The picture being released.
  82  */
  83 void ff_thread_release_ext_buffer(AVCodecContext *avctx, ThreadFrame *f);
  84
  85 int ff_thread_ref_frame(ThreadFrame *dst, const ThreadFrame *src);
  86
  87 #endif