1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/*
* generic decoding-related code
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_DECODE_H
#define AVCODEC_DECODE_H
#include "libavutil/buffer.h"
#include "libavutil/frame.h"
#include "libavutil/hwcontext.h"
#include "avcodec.h"
/**
* This struct stores per-frame lavc-internal data and is attached to it via
* private_ref.
*/
typedef struct FrameDecodeData {
/**
* The callback to perform some delayed processing on the frame right
* before it is returned to the caller.
*
* @note This code is called at some unspecified point after the frame is
* returned from the decoder's decode/receive_frame call. Therefore it cannot rely
* on AVCodecContext being in any specific state, so it does not get to
* access AVCodecContext directly at all. All the state it needs must be
* stored in the post_process_opaque object.
*/
int (*post_process)(void *logctx, AVFrame *frame);
void *post_process_opaque;
void (*post_process_opaque_free)(void *opaque);
/**
* Per-frame private data for hwaccels.
*/
void *hwaccel_priv;
void (*hwaccel_priv_free)(void *priv);
} FrameDecodeData;
/**
* avcodec_receive_frame() implementation for decoders.
*/
int ff_decode_receive_frame(AVCodecContext *avctx, AVFrame *frame);
/**
* Called by decoders to get the next packet for decoding.
*
* @param pkt An empty packet to be filled with data.
* @return 0 if a new reference has been successfully written to pkt
* AVERROR(EAGAIN) if no data is currently available
* AVERROR_EOF if and end of stream has been reached, so no more data
* will be available
*/
int ff_decode_get_packet(AVCodecContext *avctx, AVPacket *pkt);
/**
* Set various frame properties from the provided packet.
*/
int ff_decode_frame_props_from_pkt(const AVCodecContext *avctx,
AVFrame *frame, const AVPacket *pkt);
/**
* Set various frame properties from the codec context / packet data.
*/
int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame);
/**
* Make sure avctx.hw_frames_ctx is set. If it's not set, the function will
* try to allocate it from hw_device_ctx. If that is not possible, an error
* message is printed, and an error code is returned.
*/
int ff_decode_get_hw_frames_ctx(AVCodecContext *avctx,
enum AVHWDeviceType dev_type);
int ff_attach_decode_data(AVFrame *frame);
/**
* Check whether the side-data of src contains a palette of
* size AVPALETTE_SIZE; if so, copy it to dst and return 1;
* else return 0.
* Also emit an error message upon encountering a palette
* with invalid size.
*/
int ff_copy_palette(void *dst, const AVPacket *src, void *logctx);
/**
* Perform decoder initialization and validation.
* Called when opening the decoder, before the FFCodec.init() call.
*/
int ff_decode_preinit(AVCodecContext *avctx);
/**
* Check that the provided frame dimensions are valid and set them on the codec
* context.
*/
int ff_set_dimensions(AVCodecContext *s, int width, int height);
/**
* Check that the provided sample aspect ratio is valid and set it on the codec
* context.
*/
int ff_set_sar(AVCodecContext *avctx, AVRational sar);
/**
* Select the (possibly hardware accelerated) pixel format.
* This is a wrapper around AVCodecContext.get_format() and should be used
* instead of calling get_format() directly.
*
* The list of pixel formats must contain at least one valid entry, and is
* terminated with AV_PIX_FMT_NONE. If it is possible to decode to software,
* the last entry in the list must be the most accurate software format.
* If it is not possible to decode to software, AVCodecContext.sw_pix_fmt
* must be set before calling this function.
*/
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt);
/**
* Get a buffer for a frame. This is a wrapper around
* AVCodecContext.get_buffer() and should be used instead calling get_buffer()
* directly.
*/
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
#define FF_REGET_BUFFER_FLAG_READONLY 1 ///< the returned buffer does not need to be writable
/**
* Identical in function to ff_get_buffer(), except it reuses the existing buffer
* if available.
*/
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags);
/**
* Add or update AV_FRAME_DATA_MATRIXENCODING side data.
*/
int ff_side_data_update_matrix_encoding(AVFrame *frame,
enum AVMatrixEncoding matrix_encoding);
#endif /* AVCODEC_DECODE_H */
|
