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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
  47.     AVFrame *ref;
  48.     int cr_size;
  49.     int cr_threshold;
  50. } LibWebPContextCommon;
  51.  
  52. int ff_libwebp_error_to_averror(int err);
  53.  
  54. av_cold int ff_libwebp_encode_init_common(AVCodecContext *avctx);
  55.  
  56. int ff_libwebp_get_frame(AVCodecContext *avctx, LibWebPContextCommon *s,
  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 */
  85.