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 #include "libavutil/opt.h"
28 #include "libwebpenc_common.h"
29
30 const FFCodecDefault ff_libwebp_defaults[] = {
31 { "compression_level", "4" },
32 { "global_quality", "-1" },
33 { NULL },
34 };
35
36 #define OFFSET(x) offsetof(LibWebPContextCommon, x)
37 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
38 static const AVOption options[] = {
39 { "lossless", "Use lossless mode", OFFSET(lossless), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
40 { "preset", "Configuration preset", OFFSET(preset), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, WEBP_PRESET_TEXT, VE, "preset" },
41 { "none", "do not use a preset", 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, 0, 0, VE, "preset" },
42 { "default", "default preset", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_DEFAULT }, 0, 0, VE, "preset" },
43 { "picture", "digital picture, like portrait, inner shot", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_PICTURE }, 0, 0, VE, "preset" },
44 { "photo", "outdoor photograph, with natural lighting", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_PHOTO }, 0, 0, VE, "preset" },
45 { "drawing", "hand or line drawing, with high-contrast details", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_DRAWING }, 0, 0, VE, "preset" },
46 { "icon", "small-sized colorful images", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_ICON }, 0, 0, VE, "preset" },
47 { "text", "text-like", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_TEXT }, 0, 0, VE, "preset" },
48 { "cr_threshold","Conditional replenishment threshold", OFFSET(cr_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
49 { "cr_size" ,"Conditional replenishment block size", OFFSET(cr_size) , AV_OPT_TYPE_INT, { .i64 = 16 }, 0, 256, VE },
50 { "quality" ,"Quality", OFFSET(quality), AV_OPT_TYPE_FLOAT, { .dbl = 75 }, 0, 100, VE },
51 { NULL },
52 };
53
54 const AVClass ff_libwebpenc_class = {
55 .class_name = "libwebp encoder",
56 .item_name = av_default_item_name,
57 .option = options,
58 .version = LIBAVUTIL_VERSION_INT,
59 };
60
61 const enum AVPixelFormat ff_libwebpenc_pix_fmts[] = {
62 AV_PIX_FMT_RGB32,
63 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P,
64 AV_PIX_FMT_NONE
65 };
66
ff_libwebp_error_to_averror(int err)67 int ff_libwebp_error_to_averror(int err)
68 {
69 switch (err) {
70 case VP8_ENC_ERROR_OUT_OF_MEMORY:
71 case VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY:
72 return AVERROR(ENOMEM);
73 case VP8_ENC_ERROR_NULL_PARAMETER:
74 case VP8_ENC_ERROR_INVALID_CONFIGURATION:
75 case VP8_ENC_ERROR_BAD_DIMENSION:
76 return AVERROR(EINVAL);
77 }
78 return AVERROR_UNKNOWN;
79 }
80
ff_libwebp_encode_init_common(AVCodecContext * avctx)81 av_cold int ff_libwebp_encode_init_common(AVCodecContext *avctx)
82 {
83 LibWebPContextCommon *s = avctx->priv_data;
84 int ret;
85
86 if (avctx->global_quality >= 0)
87 s->quality = av_clipf(avctx->global_quality / (float)FF_QP2LAMBDA,
88 0.0f, 100.0f);
89
90 if (avctx->compression_level < 0 || avctx->compression_level > 6) {
91 av_log(avctx, AV_LOG_WARNING, "invalid compression level: %d\n",
92 avctx->compression_level);
93 avctx->compression_level = av_clip(avctx->compression_level, 0, 6);
94 }
95
96 if (s->preset >= WEBP_PRESET_DEFAULT) {
97 ret = WebPConfigPreset(&s->config, s->preset, s->quality);
98 if (!ret)
99 return AVERROR_UNKNOWN;
100 s->lossless = s->config.lossless;
101 s->quality = s->config.quality;
102 avctx->compression_level = s->config.method;
103 } else {
104 ret = WebPConfigInit(&s->config);
105 if (!ret)
106 return AVERROR_UNKNOWN;
107
108 s->config.lossless = s->lossless;
109 s->config.quality = s->quality;
110 s->config.method = avctx->compression_level;
111
112 ret = WebPValidateConfig(&s->config);
113 if (!ret)
114 return AVERROR(EINVAL);
115 }
116
117 av_log(avctx, AV_LOG_DEBUG, "%s - quality=%.1f method=%d\n",
118 s->lossless ? "Lossless" : "Lossy", s->quality,
119 avctx->compression_level);
120
121 return 0;
122 }
123
ff_libwebp_get_frame(AVCodecContext * avctx,LibWebPContextCommon * s,const AVFrame * frame,AVFrame ** alt_frame_ptr,WebPPicture ** pic_ptr)124 int ff_libwebp_get_frame(AVCodecContext *avctx, LibWebPContextCommon *s,
125 const AVFrame *frame, AVFrame **alt_frame_ptr,
126 WebPPicture **pic_ptr) {
127 int ret;
128 WebPPicture *pic = NULL;
129 AVFrame *alt_frame = NULL;
130
131 if (avctx->width > WEBP_MAX_DIMENSION || avctx->height > WEBP_MAX_DIMENSION) {
132 av_log(avctx, AV_LOG_ERROR, "Picture size is too large. Max is %dx%d.\n",
133 WEBP_MAX_DIMENSION, WEBP_MAX_DIMENSION);
134 return AVERROR(EINVAL);
135 }
136
137 *pic_ptr = av_malloc(sizeof(*pic));
138 pic = *pic_ptr;
139 if (!pic)
140 return AVERROR(ENOMEM);
141
142 ret = WebPPictureInit(pic);
143 if (!ret) {
144 ret = AVERROR_UNKNOWN;
145 goto end;
146 }
147 pic->width = avctx->width;
148 pic->height = avctx->height;
149
150 if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
151 if (!s->lossless) {
152 /* libwebp will automatically convert RGB input to YUV when
153 encoding lossy. */
154 if (!s->conversion_warning) {
155 av_log(avctx, AV_LOG_WARNING,
156 "Using libwebp for RGB-to-YUV conversion. You may want "
157 "to consider passing in YUV instead for lossy "
158 "encoding.\n");
159 s->conversion_warning = 1;
160 }
161 }
162 pic->use_argb = 1;
163 pic->argb = (uint32_t *)frame->data[0];
164 pic->argb_stride = frame->linesize[0] / 4;
165 } else {
166 if (frame->linesize[1] != frame->linesize[2] || s->cr_threshold) {
167 if (!s->chroma_warning && !s->cr_threshold) {
168 av_log(avctx, AV_LOG_WARNING,
169 "Copying frame due to differing chroma linesizes.\n");
170 s->chroma_warning = 1;
171 }
172 *alt_frame_ptr = av_frame_alloc();
173 alt_frame = *alt_frame_ptr;
174 if (!alt_frame) {
175 ret = AVERROR(ENOMEM);
176 goto end;
177 }
178 alt_frame->width = frame->width;
179 alt_frame->height = frame->height;
180 alt_frame->format = frame->format;
181 if (s->cr_threshold)
182 alt_frame->format = AV_PIX_FMT_YUVA420P;
183 ret = av_frame_get_buffer(alt_frame, 0);
184 if (ret < 0)
185 goto end;
186 alt_frame->format = frame->format;
187 av_frame_copy(alt_frame, frame);
188 frame = alt_frame;
189 if (s->cr_threshold) {
190 int x,y, x2, y2, p;
191 int bs = s->cr_size;
192
193 if (!s->ref) {
194 s->ref = av_frame_clone(frame);
195 if (!s->ref) {
196 ret = AVERROR(ENOMEM);
197 goto end;
198 }
199 }
200
201 alt_frame->format = AV_PIX_FMT_YUVA420P;
202 for (y = 0; y < frame->height; y+= bs) {
203 for (x = 0; x < frame->width; x+= bs) {
204 int skip;
205 int sse = 0;
206 for (p = 0; p < 3; p++) {
207 int bs2 = bs >> !!p;
208 int w = AV_CEIL_RSHIFT(frame->width , !!p);
209 int h = AV_CEIL_RSHIFT(frame->height, !!p);
210 int xs = x >> !!p;
211 int ys = y >> !!p;
212 for (y2 = ys; y2 < FFMIN(ys + bs2, h); y2++) {
213 for (x2 = xs; x2 < FFMIN(xs + bs2, w); x2++) {
214 int diff = frame->data[p][frame->linesize[p] * y2 + x2]
215 -s->ref->data[p][frame->linesize[p] * y2 + x2];
216 sse += diff*diff;
217 }
218 }
219 }
220 skip = sse < s->cr_threshold && frame->data[3] != s->ref->data[3];
221 if (!skip)
222 for (p = 0; p < 3; p++) {
223 int bs2 = bs >> !!p;
224 int w = AV_CEIL_RSHIFT(frame->width , !!p);
225 int h = AV_CEIL_RSHIFT(frame->height, !!p);
226 int xs = x >> !!p;
227 int ys = y >> !!p;
228 for (y2 = ys; y2 < FFMIN(ys + bs2, h); y2++) {
229 memcpy(&s->ref->data[p][frame->linesize[p] * y2 + xs],
230 & frame->data[p][frame->linesize[p] * y2 + xs], FFMIN(bs2, w-xs));
231 }
232 }
233 for (y2 = y; y2 < FFMIN(y+bs, frame->height); y2++) {
234 memset(&frame->data[3][frame->linesize[3] * y2 + x],
235 skip ? 0 : 255,
236 FFMIN(bs, frame->width-x));
237 }
238 }
239 }
240 }
241 }
242
243 pic->use_argb = 0;
244 pic->y = frame->data[0];
245 pic->u = frame->data[1];
246 pic->v = frame->data[2];
247 pic->y_stride = frame->linesize[0];
248 pic->uv_stride = frame->linesize[1];
249 if (frame->format == AV_PIX_FMT_YUVA420P) {
250 pic->colorspace = WEBP_YUV420A;
251 pic->a = frame->data[3];
252 pic->a_stride = frame->linesize[3];
253 if (alt_frame)
254 WebPCleanupTransparentArea(pic);
255 } else {
256 pic->colorspace = WEBP_YUV420;
257 }
258
259 if (s->lossless) {
260 /* We do not have a way to automatically prioritize RGB over YUV
261 in automatic pixel format conversion based on whether we're
262 encoding lossless or lossy, so we do conversion with libwebp as
263 a convenience. */
264 if (!s->conversion_warning) {
265 av_log(avctx, AV_LOG_WARNING,
266 "Using libwebp for YUV-to-RGB conversion. You may want "
267 "to consider passing in RGB instead for lossless "
268 "encoding.\n");
269 s->conversion_warning = 1;
270 }
271
272 #if (WEBP_ENCODER_ABI_VERSION <= 0x201)
273 /* libwebp should do the conversion automatically, but there is a
274 bug that causes it to return an error instead, so a work-around
275 is required.
276 See https://code.google.com/p/webp/issues/detail?id=178 */
277 pic->memory_ = (void*)1; /* something non-null */
278 ret = WebPPictureYUVAToARGB(pic);
279 if (!ret) {
280 av_log(avctx, AV_LOG_ERROR,
281 "WebPPictureYUVAToARGB() failed with error: %d\n",
282 pic->error_code);
283 ret = libwebp_error_to_averror(pic->error_code);
284 goto end;
285 }
286 pic->memory_ = NULL; /* restore pointer */
287 #endif
288 }
289 }
290 end:
291 return ret;
292 }
293