FFmpeg
libwebpenc_common.h
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1 /*
2  * WebP encoding support via libwebp
3  * Copyright (c) 2013 Justin Ruggles <justin.ruggles@gmail.com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * WebP encoder using libwebp: common structs and methods.
25  */
26 
27 #ifndef AVCODEC_LIBWEBPENC_COMMON_H
28 #define AVCODEC_LIBWEBPENC_COMMON_H
29 
30 #include <webp/encode.h>
31 
32 #include "libavutil/common.h"
33 #include "libavutil/frame.h"
34 #include "libavutil/imgutils.h"
35 #include "libavutil/opt.h"
36 #include "avcodec.h"
37 #include "internal.h"
38 
39 typedef struct LibWebPContextCommon {
40  AVClass *class; // class for AVOptions
41  float quality; // lossy quality 0 - 100
42  int lossless; // use lossless encoding
43  int preset; // configuration preset
44  int chroma_warning; // chroma linesize mismatch warning has been printed
45  int conversion_warning; // pixel format conversion warning has been printed
46  WebPConfig config; // libwebp configuration
48  int cr_size;
51 
52 int ff_libwebp_error_to_averror(int err);
53 
55 
57  const AVFrame *frame, AVFrame **alt_frame_ptr,
58  WebPPicture **pic_ptr);
59 
60 #define OFFSET(x) offsetof(LibWebPContextCommon, x)
61 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
62 static const AVOption options[] = {
63  { "lossless", "Use lossless mode", OFFSET(lossless), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
64  { "preset", "Configuration preset", OFFSET(preset), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, WEBP_PRESET_TEXT, VE, "preset" },
65  { "none", "do not use a preset", 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, 0, 0, VE, "preset" },
66  { "default", "default preset", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_DEFAULT }, 0, 0, VE, "preset" },
67  { "picture", "digital picture, like portrait, inner shot", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_PICTURE }, 0, 0, VE, "preset" },
68  { "photo", "outdoor photograph, with natural lighting", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_PHOTO }, 0, 0, VE, "preset" },
69  { "drawing", "hand or line drawing, with high-contrast details", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_DRAWING }, 0, 0, VE, "preset" },
70  { "icon", "small-sized colorful images", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_ICON }, 0, 0, VE, "preset" },
71  { "text", "text-like", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_TEXT }, 0, 0, VE, "preset" },
72  { "cr_threshold","Conditional replenishment threshold", OFFSET(cr_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
73  { "cr_size" ,"Conditional replenishment block size", OFFSET(cr_size) , AV_OPT_TYPE_INT, { .i64 = 16 }, 0, 256, VE },
74  { "quality" ,"Quality", OFFSET(quality), AV_OPT_TYPE_FLOAT, { .dbl = 75 }, 0, 100, VE },
75  { NULL },
76 };
77 
78 static const AVCodecDefault libwebp_defaults[] = {
79  { "compression_level", "4" },
80  { "global_quality", "-1" },
81  { NULL },
82 };
83 
84 #endif /* AVCODEC_LIBWEBPENC_COMMON_H */
opt.h
libwebp_defaults
static const AVCodecDefault libwebp_defaults[]
Definition: libwebpenc_common.h:78
OFFSET
#define OFFSET(x)
Definition: libwebpenc_common.h:60
LibWebPContextCommon::chroma_warning
int chroma_warning
Definition: libwebpenc_common.h:44
LibWebPContextCommon::quality
float quality
Definition: libwebpenc_common.h:41
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
internal.h
AVOption
AVOption.
Definition: opt.h:248
LibWebPContextCommon::lossless
int lossless
Definition: libwebpenc_common.h:42
options
static const AVOption options[]
Definition: libwebpenc_common.h:62
quality
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about quality
Definition: rate_distortion.txt:12
preset
preset
Definition: vf_curves.c:46
av_cold
#define av_cold
Definition: attributes.h:90
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVCodecDefault
Definition: internal.h:207
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
NULL
#define NULL
Definition: coverity.c:32
ff_libwebp_encode_init_common
av_cold int ff_libwebp_encode_init_common(AVCodecContext *avctx)
Definition: libwebpenc_common.c:43
VE
#define VE
Definition: libwebpenc_common.h:61
frame.h
LibWebPContextCommon::ref
AVFrame * ref
Definition: libwebpenc_common.h:47
LibWebPContextCommon::conversion_warning
int conversion_warning
Definition: libwebpenc_common.h:45
LibWebPContextCommon
Definition: libwebpenc_common.h:39
AV_OPT_TYPE_FLOAT
@ AV_OPT_TYPE_FLOAT
Definition: opt.h:228
common.h
LibWebPContextCommon::cr_threshold
int cr_threshold
Definition: libwebpenc_common.h:49
ff_libwebp_error_to_averror
int ff_libwebp_error_to_averror(int err)
Definition: libwebpenc_common.c:29
avcodec.h
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
ff_libwebp_get_frame
int ff_libwebp_get_frame(AVCodecContext *avctx, LibWebPContextCommon *s, const AVFrame *frame, AVFrame **alt_frame_ptr, WebPPicture **pic_ptr)
Definition: libwebpenc_common.c:86
AVCodecContext
main external API structure.
Definition: avcodec.h:501
LibWebPContextCommon::config
WebPConfig config
Definition: libwebpenc_common.h:46
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
imgutils.h
LibWebPContextCommon::cr_size
int cr_size
Definition: libwebpenc_common.h:48
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:234
LibWebPContextCommon::preset
int preset
Definition: libwebpenc_common.h:43