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This is useful when the lifetime of the object to be shared is the whole decoding process as it allows to avoid having to sync them every time in update_thread_context. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
118 lines
4.3 KiB
C
118 lines
4.3 KiB
C
/*
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* Copyright (c) 2008 Alexander Strange <astrange@ithinksw.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Multithreading support functions
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* @author Alexander Strange <astrange@ithinksw.com>
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*/
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#ifndef AVCODEC_THREAD_H
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#define AVCODEC_THREAD_H
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#include "libavutil/buffer.h"
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#include "avcodec.h"
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/**
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* Wait for decoding threads to finish and reset internal state.
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* Called by avcodec_flush_buffers().
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*
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* @param avctx The context.
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*/
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void ff_thread_flush(AVCodecContext *avctx);
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/**
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* Submit a new frame to a decoding thread.
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* Returns the next available frame in picture. *got_picture_ptr
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* will be 0 if none is available.
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* The return value on success is the size of the consumed packet for
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* compatibility with FFCodec.decode. This means the decoder
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* has to consume the full packet.
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*
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* Parameters are the same as FFCodec.decode.
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*/
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int ff_thread_decode_frame(AVCodecContext *avctx, AVFrame *picture,
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int *got_picture_ptr, AVPacket *avpkt);
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int ff_thread_can_start_frame(AVCodecContext *avctx);
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/**
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* If the codec defines update_thread_context(), call this
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* when they are ready for the next thread to start decoding
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* the next frame. After calling it, do not change any variables
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* read by the update_thread_context() method, or call ff_thread_get_buffer().
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*
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* @param avctx The context.
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*/
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void ff_thread_finish_setup(AVCodecContext *avctx);
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/**
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* Wrapper around get_buffer() for frame-multithreaded codecs.
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* Call this function instead of ff_get_buffer(f).
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* Cannot be called after the codec has called ff_thread_finish_setup().
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*
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* @param avctx The current context.
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* @param f The frame to write into.
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*/
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int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f, int flags);
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int ff_thread_init(AVCodecContext *s);
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int ff_slice_thread_execute_with_mainfunc(AVCodecContext *avctx,
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int (*action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr),
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int (*main_func)(AVCodecContext *c), void *arg, int *ret, int job_count);
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void ff_thread_free(AVCodecContext *s);
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int ff_slice_thread_allocz_entries(AVCodecContext *avctx, int count);
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int ff_slice_thread_init_progress(AVCodecContext *avctx);
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void ff_thread_report_progress2(AVCodecContext *avctx, int field, int thread, int n);
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void ff_thread_await_progress2(AVCodecContext *avctx, int field, int thread, int shift);
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enum ThreadingStatus {
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FF_THREAD_IS_COPY,
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FF_THREAD_IS_FIRST_THREAD,
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FF_THREAD_NO_FRAME_THREADING,
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};
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/**
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* Allows to synchronize objects whose lifetime is the whole decoding
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* process among all frame threads.
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*
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* When called from a non-copy thread, do nothing.
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* When called from another thread, place a new RefStruct reference
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* at the given offset in the calling thread's private data from
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* the RefStruct reference in the private data of the first decoding thread.
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* The first thread must have a valid RefStruct reference at the given
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* offset in its private data; the calling thread must not have
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* a reference at this offset in its private data (must be NULL).
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*
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* @param avctx an AVCodecContext
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* @param offset offset of the RefStruct reference in avctx's private data
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*
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* @retval FF_THREAD_IS_COPY if frame-threading is in use and the
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* calling thread is a copy; in this case, the RefStruct reference
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* will be set.
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* @retval FF_THREAD_IS_MAIN_THREAD if frame-threading is in use
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* and the calling thread is the main thread.
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* @retval FF_THREAD_NO_FRAME_THREADING if frame-threading is not in use.
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*/
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enum ThreadingStatus ff_thread_sync_ref(AVCodecContext *avctx, size_t offset);
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#endif /* AVCODEC_THREAD_H */
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