summaryrefslogtreecommitdiffstats
path: root/libavcodec/libwebpenc_common.c
blob: a76b6da5d677b833082dc1ffe2d3284d82465480 (plain)
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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
/*
 * WebP encoding support via libwebp
 * Copyright (c) 2013 Justin Ruggles <justin.ruggles@gmail.com>
 *
 * 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
 */

/**
 * @file
 * WebP encoder using libwebp: common structs and methods.
 */

#include "libwebpenc_common.h"

int ff_libwebp_error_to_averror(int err)
{
    switch (err) {
    case VP8_ENC_ERROR_OUT_OF_MEMORY:
    case VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY:
        return AVERROR(ENOMEM);
    case VP8_ENC_ERROR_NULL_PARAMETER:
    case VP8_ENC_ERROR_INVALID_CONFIGURATION:
    case VP8_ENC_ERROR_BAD_DIMENSION:
        return AVERROR(EINVAL);
    }
    return AVERROR_UNKNOWN;
}

av_cold int ff_libwebp_encode_init_common(AVCodecContext *avctx)
{
    LibWebPContextCommon *s = avctx->priv_data;
    int ret;

    if (avctx->global_quality >= 0)
        s->quality = av_clipf(avctx->global_quality / (float)FF_QP2LAMBDA,
                              0.0f, 100.0f);

    if (avctx->compression_level < 0 || avctx->compression_level > 6) {
        av_log(avctx, AV_LOG_WARNING, "invalid compression level: %d\n",
               avctx->compression_level);
        avctx->compression_level = av_clip(avctx->compression_level, 0, 6);
    }

    if (s->preset >= WEBP_PRESET_DEFAULT) {
        ret = WebPConfigPreset(&s->config, s->preset, s->quality);
        if (!ret)
            return AVERROR_UNKNOWN;
        s->lossless              = s->config.lossless;
        s->quality               = s->config.quality;
        avctx->compression_level = s->config.method;
    } else {
        ret = WebPConfigInit(&s->config);
        if (!ret)
            return AVERROR_UNKNOWN;

        s->config.lossless = s->lossless;
        s->config.quality  = s->quality;
        s->config.method   = avctx->compression_level;

        ret = WebPValidateConfig(&s->config);
        if (!ret)
            return AVERROR(EINVAL);
    }

    av_log(avctx, AV_LOG_DEBUG, "%s - quality=%.1f method=%d\n",
           s->lossless ? "Lossless" : "Lossy", s->quality,
           avctx->compression_level);

    return 0;
}

int ff_libwebp_get_frame(AVCodecContext *avctx, LibWebPContextCommon *s,
                         const AVFrame *frame, AVFrame **alt_frame_ptr,
                         WebPPicture **pic_ptr) {
    int ret;
    WebPPicture *pic = NULL;
    AVFrame *alt_frame = NULL;

    if (avctx->width > WEBP_MAX_DIMENSION || avctx->height > WEBP_MAX_DIMENSION) {
        av_log(avctx, AV_LOG_ERROR, "Picture size is too large. Max is %dx%d.\n",
               WEBP_MAX_DIMENSION, WEBP_MAX_DIMENSION);
        return AVERROR(EINVAL);
    }

    *pic_ptr = av_malloc(sizeof(*pic));
    pic = *pic_ptr;
    if (!pic)
        return AVERROR(ENOMEM);

    ret = WebPPictureInit(pic);
    if (!ret) {
        ret = AVERROR_UNKNOWN;
        goto end;
    }
    pic->width  = avctx->width;
    pic->height = avctx->height;

    if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
        if (!s->lossless) {
            /* libwebp will automatically convert RGB input to YUV when
               encoding lossy. */
            if (!s->conversion_warning) {
                av_log(avctx, AV_LOG_WARNING,
                       "Using libwebp for RGB-to-YUV conversion. You may want "
                       "to consider passing in YUV instead for lossy "
                       "encoding.\n");
                s->conversion_warning = 1;
            }
        }
        pic->use_argb    = 1;
        pic->argb        = (uint32_t *)frame->data[0];
        pic->argb_stride = frame->linesize[0] / 4;
    } else {
        if (frame->linesize[1] != frame->linesize[2] || s->cr_threshold) {
            if (!s->chroma_warning && !s->cr_threshold) {
                av_log(avctx, AV_LOG_WARNING,
                       "Copying frame due to differing chroma linesizes.\n");
                s->chroma_warning = 1;
            }
            *alt_frame_ptr = av_frame_alloc();
            alt_frame = *alt_frame_ptr;
            if (!alt_frame) {
                ret = AVERROR(ENOMEM);
                goto end;
            }
            alt_frame->width  = frame->width;
            alt_frame->height = frame->height;
            alt_frame->format = frame->format;
            if (s->cr_threshold)
                alt_frame->format = AV_PIX_FMT_YUVA420P;
            ret = av_frame_get_buffer(alt_frame, 32);
            if (ret < 0)
                goto end;
            alt_frame->format = frame->format;
            av_frame_copy(alt_frame, frame);
            frame = alt_frame;
            if (s->cr_threshold) {
                int x,y, x2, y2, p;
                int bs = s->cr_size;

                if (!s->ref) {
                    s->ref = av_frame_clone(frame);
                    if (!s->ref) {
                        ret = AVERROR(ENOMEM);
                        goto end;
                    }
                }

                alt_frame->format = AV_PIX_FMT_YUVA420P;
                for (y = 0; y < frame->height; y+= bs) {
                    for (x = 0; x < frame->width; x+= bs) {
                        int skip;
                        int sse = 0;
                        for (p = 0; p < 3; p++) {
                            int bs2 = bs >> !!p;
                            int w = FF_CEIL_RSHIFT(frame->width , !!p);
                            int h = FF_CEIL_RSHIFT(frame->height, !!p);
                            int xs = x >> !!p;
                            int ys = y >> !!p;
                            for (y2 = ys; y2 < FFMIN(ys + bs2, h); y2++) {
                                for (x2 = xs; x2 < FFMIN(xs + bs2, w); x2++) {
                                    int diff =  frame->data[p][frame->linesize[p] * y2 + x2]
                                              -s->ref->data[p][frame->linesize[p] * y2 + x2];
                                    sse += diff*diff;
                                }
                            }
                        }
                        skip = sse < s->cr_threshold && frame->data[3] != s->ref->data[3];
                        if (!skip)
                            for (p = 0; p < 3; p++) {
                                int bs2 = bs >> !!p;
                                int w = FF_CEIL_RSHIFT(frame->width , !!p);
                                int h = FF_CEIL_RSHIFT(frame->height, !!p);
                                int xs = x >> !!p;
                                int ys = y >> !!p;
                                for (y2 = ys; y2 < FFMIN(ys + bs2, h); y2++) {
                                    memcpy(&s->ref->data[p][frame->linesize[p] * y2 + xs],
                                            & frame->data[p][frame->linesize[p] * y2 + xs], FFMIN(bs2, w-xs));
                                }
                            }
                        for (y2 = y; y2 < FFMIN(y+bs, frame->height); y2++) {
                            memset(&frame->data[3][frame->linesize[3] * y2 + x],
                                    skip ? 0 : 255,
                                    FFMIN(bs, frame->width-x));
                        }
                    }
                }
            }
        }

        pic->use_argb  = 0;
        pic->y         = frame->data[0];
        pic->u         = frame->data[1];
        pic->v         = frame->data[2];
        pic->y_stride  = frame->linesize[0];
        pic->uv_stride = frame->linesize[1];
        if (frame->format == AV_PIX_FMT_YUVA420P) {
            pic->colorspace = WEBP_YUV420A;
            pic->a          = frame->data[3];
            pic->a_stride   = frame->linesize[3];
            if (alt_frame)
                WebPCleanupTransparentArea(pic);
        } else {
            pic->colorspace = WEBP_YUV420;
        }

        if (s->lossless) {
            /* We do not have a way to automatically prioritize RGB over YUV
               in automatic pixel format conversion based on whether we're
               encoding lossless or lossy, so we do conversion with libwebp as
               a convenience. */
            if (!s->conversion_warning) {
                av_log(avctx, AV_LOG_WARNING,
                       "Using libwebp for YUV-to-RGB conversion. You may want "
                       "to consider passing in RGB instead for lossless "
                       "encoding.\n");
                s->conversion_warning = 1;
            }

#if (WEBP_ENCODER_ABI_VERSION <= 0x201)
            /* libwebp should do the conversion automatically, but there is a
               bug that causes it to return an error instead, so a work-around
               is required.
               See https://code.google.com/p/webp/issues/detail?id=178 */
            pic->memory_ = (void*)1;  /* something non-null */
            ret = WebPPictureYUVAToARGB(pic);
            if (!ret) {
                av_log(avctx, AV_LOG_ERROR,
                       "WebPPictureYUVAToARGB() failed with error: %d\n",
                       pic->error_code);
                ret = libwebp_error_to_averror(pic->error_code);
                goto end;
            }
            pic->memory_ = NULL;  /* restore pointer */
#endif
        }
    }
end:
    return ret;
}
OpenPOWER on IntegriCloud