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224 lines
8.4 KiB
C
224 lines
8.4 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/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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* 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 provided packet.
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*/
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int ff_decode_frame_props_from_pkt(const AVCodecContext *avctx,
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AVFrame *frame, const 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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* Check that the provided frame dimensions are valid and set them on the codec
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* context.
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*/
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int ff_set_dimensions(AVCodecContext *s, int width, int height);
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/**
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* Check that the provided sample aspect ratio is valid and set it on the codec
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* context.
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*/
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int ff_set_sar(AVCodecContext *avctx, AVRational sar);
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/**
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* Select the (possibly hardware accelerated) pixel format.
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* This is a wrapper around AVCodecContext.get_format() and should be used
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* instead of calling get_format() directly.
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*
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* The list of pixel formats must contain at least one valid entry, and is
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* terminated with AV_PIX_FMT_NONE. If it is possible to decode to software,
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* the last entry in the list must be the most accurate software format.
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* If it is not possible to decode to software, AVCodecContext.sw_pix_fmt
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* must be set before calling this function.
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*/
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int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt);
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/**
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* Get a buffer for a frame. This is a wrapper around
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* AVCodecContext.get_buffer() and should be used instead calling get_buffer()
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* directly.
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*/
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int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
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#define FF_REGET_BUFFER_FLAG_READONLY 1 ///< the returned buffer does not need to be writable
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/**
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* Identical in function to ff_get_buffer(), except it reuses the existing buffer
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* if available.
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*/
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int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
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/**
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* Add or update AV_FRAME_DATA_MATRIXENCODING side data.
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*/
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int ff_side_data_update_matrix_encoding(AVFrame *frame,
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enum AVMatrixEncoding matrix_encoding);
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/**
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* Allocate a hwaccel frame private data if the provided avctx
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* uses a hwaccel method that needs it. The returned data is
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* a RefStruct reference (if allocated).
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*
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* @param avctx The codec context
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* @param hwaccel_picture_private Pointer to return hwaccel_picture_private
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* @return 0 on success, < 0 on error
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*/
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int ff_hwaccel_frame_priv_alloc(AVCodecContext *avctx, void **hwaccel_picture_private);
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/**
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* Get side data of the given type from a decoding context.
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*/
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const AVPacketSideData *ff_get_coded_side_data(const AVCodecContext *avctx,
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enum AVPacketSideDataType type);
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/**
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* Wrapper around av_frame_new_side_data, which rejects side data overridden by
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* the demuxer. Returns 0 on success, and a negative error code otherwise.
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* If successful and sd is not NULL, *sd may either contain a pointer to the new
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* side data, or NULL in case the side data was already present.
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*/
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int ff_frame_new_side_data(const AVCodecContext *avctx, AVFrame *frame,
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enum AVFrameSideDataType type, size_t size,
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AVFrameSideData **sd);
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/**
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* Similar to `ff_frame_new_side_data`, but using an existing buffer ref.
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*
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* *buf is ALWAYS consumed by this function and NULL written in its place, even
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* on failure.
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*/
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int ff_frame_new_side_data_from_buf(const AVCodecContext *avctx,
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AVFrame *frame, enum AVFrameSideDataType type,
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AVBufferRef **buf);
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/**
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* Same as `ff_frame_new_side_data_from_buf`, but taking a AVFrameSideData
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* array directly instead of an AVFrame.
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*/
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int ff_frame_new_side_data_from_buf_ext(const AVCodecContext *avctx,
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AVFrameSideData ***sd, int *nb_sd,
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enum AVFrameSideDataType type,
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AVBufferRef **buf);
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struct AVMasteringDisplayMetadata;
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struct AVContentLightMetadata;
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/**
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* Wrapper around av_mastering_display_metadata_create_side_data(), which
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* rejects side data overridden by the demuxer. Returns 0 on success, and a
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* negative error code otherwise. If successful, *mdm may either be a pointer to
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* the new side data, or NULL in case the side data was already present.
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*/
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int ff_decode_mastering_display_new(const AVCodecContext *avctx, AVFrame *frame,
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struct AVMasteringDisplayMetadata **mdm);
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/**
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* Same as `ff_decode_mastering_display_new`, but taking a AVFrameSideData
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* array directly instead of an AVFrame.
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*/
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int ff_decode_mastering_display_new_ext(const AVCodecContext *avctx,
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AVFrameSideData ***sd, int *nb_sd,
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struct AVMasteringDisplayMetadata **mdm);
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/**
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* Wrapper around av_content_light_metadata_create_side_data(), which
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* rejects side data overridden by the demuxer. Returns 0 on success, and a
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* negative error code otherwise. If successful, *clm may either be a pointer to
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* the new side data, or NULL in case the side data was already present.
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*/
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int ff_decode_content_light_new(const AVCodecContext *avctx, AVFrame *frame,
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struct AVContentLightMetadata **clm);
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/**
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* Same as `ff_decode_content_light_new`, but taking a AVFrameSideData
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* array directly instead of an AVFrame.
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*/
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int ff_decode_content_light_new_ext(const AVCodecContext *avctx,
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AVFrameSideData ***sd, int *nb_sd,
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struct AVContentLightMetadata **clm);
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#endif /* AVCODEC_DECODE_H */
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