/* * Copyright (c) 2008 Alexander Strange <astrange@ithinksw.com> * * 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 */ /** * @file * Multithreading support functions * @author Alexander Strange <astrange@ithinksw.com> */ #ifndef AVCODEC_THREAD_H #define AVCODEC_THREAD_H #include "config.h" #include "avcodec.h" /** * Waits for decoding threads to finish and resets internal * state. Called by avcodec_flush_buffers(). * * @param avctx The context. */ void ff_thread_flush(AVCodecContext *avctx); /** * Submits a new frame to a decoding thread. * Returns the next available frame in picture. *got_picture_ptr * will be 0 if none is available. * * Parameters are the same as avcodec_decode_video2(). */ int ff_thread_decode_frame(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, AVPacket *avpkt); /** * If the codec defines update_thread_context(), call this * when they are ready for the next thread to start decoding * the next frame. After calling it, do not change any variables * read by the update_thread_context() method, or call ff_thread_get_buffer(). * * @param avctx The context. */ void ff_thread_finish_setup(AVCodecContext *avctx); /** * Notifies later decoding threads when part of their reference picture * is ready. * Call this when some part of the picture is finished decoding. * Later calls with lower values of progress have no effect. * * @param f The picture being decoded. * @param progress Value, in arbitrary units, of how much of the picture has decoded. * @param field The field being decoded, for field-picture codecs. * 0 for top field or frame pictures, 1 for bottom field. */ void ff_thread_report_progress(AVFrame *f, int progress, int field); /** * Waits for earlier decoding threads to finish reference pictures * Call this before accessing some part of a picture, with a given * value for progress, and it will return after the responsible decoding * thread calls ff_thread_report_progress() with the same or * higher value for progress. * * @param f The picture being referenced. * @param progress Value, in arbitrary units, to wait for. * @param field The field being referenced, for field-picture codecs. * 0 for top field or frame pictures, 1 for bottom field. */ void ff_thread_await_progress(AVFrame *f, int progress, int field); /** * Wrapper around get_buffer() for frame-multithreaded codecs. * Call this function instead of avctx->get_buffer(f). * Cannot be called after the codec has called ff_thread_finish_setup(). * * @param avctx The current context. * @param f The frame to write into. */ int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f); /** * Wrapper around release_buffer() frame-for multithreaded codecs. * Call this function instead of avctx->release_buffer(f). * The AVFrame will be copied and the actual release_buffer() call * will be performed later. The contents of data pointed to by the * AVFrame should not be changed until ff_thread_get_buffer() is called * on it. * * @param avctx The current context. * @param f The picture being released. */ void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f); int ff_thread_init(AVCodecContext *s); void ff_thread_free(AVCodecContext *s); #endif /* AVCODEC_THREAD_H */