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103 lines
3.4 KiB
C
103 lines
3.4 KiB
C
/*
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* generic decoding-related code
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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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#ifndef AVCODEC_DECODE_H
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#define AVCODEC_DECODE_H
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#include "libavutil/buffer.h"
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#include "libavutil/frame.h"
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#include "libavutil/hwcontext.h"
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#include "avcodec.h"
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/**
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* This struct stores per-frame lavc-internal data and is attached to it via
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* private_ref.
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*/
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typedef struct FrameDecodeData {
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/**
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* The callback to perform some delayed processing on the frame right
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* before it is returned to the caller.
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*
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* @note This code is called at some unspecified point after the frame is
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* returned from the decoder's decode/receive_frame call. Therefore it cannot rely
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* on AVCodecContext being in any specific state, so it does not get to
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* access AVCodecContext directly at all. All the state it needs must be
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* stored in the post_process_opaque object.
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*/
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int (*post_process)(void *logctx, AVFrame *frame);
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void *post_process_opaque;
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void (*post_process_opaque_free)(void *opaque);
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/**
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* Per-frame private data for hwaccels.
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*/
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void *hwaccel_priv;
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void (*hwaccel_priv_free)(void *priv);
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} FrameDecodeData;
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/**
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* avcodec_receive_frame() implementation for decoders.
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*/
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int ff_decode_receive_frame(AVCodecContext *avctx, AVFrame *frame);
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/**
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* Called by decoders to get the next packet for decoding.
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*
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* @param pkt An empty packet to be filled with data.
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* @return 0 if a new reference has been successfully written to pkt
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* AVERROR(EAGAIN) if no data is currently available
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* AVERROR_EOF if and end of stream has been reached, so no more data
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* will be available
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*/
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int ff_decode_get_packet(AVCodecContext *avctx, AVPacket *pkt);
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/**
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* Set various frame properties from the codec context / packet data.
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*/
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int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame);
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/**
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* Make sure avctx.hw_frames_ctx is set. If it's not set, the function will
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* try to allocate it from hw_device_ctx. If that is not possible, an error
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* message is printed, and an error code is returned.
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*/
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int ff_decode_get_hw_frames_ctx(AVCodecContext *avctx,
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enum AVHWDeviceType dev_type);
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int ff_attach_decode_data(AVFrame *frame);
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/**
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* Check whether the side-data of src contains a palette of
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* size AVPALETTE_SIZE; if so, copy it to dst and return 1;
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* else return 0.
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* Also emit an error message upon encountering a palette
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* with invalid size.
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*/
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int ff_copy_palette(void *dst, const AVPacket *src, void *logctx);
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/**
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* Perform decoder initialization and validation.
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* Called when opening the decoder, before the FFCodec.init() call.
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*/
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int ff_decode_preinit(AVCodecContext *avctx);
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#endif /* AVCODEC_DECODE_H */
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