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1 | /* |
2 | * Copyright (c) 1990 James Ashton - Sydney University | |
3 | * Copyright (c) 2012 Stefano Sabatini | |
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 | * X-Face encoder, based on libcompface, by James Ashton. | |
25 | */ | |
26 | ||
27 | #include "xface.h" | |
28 | #include "avcodec.h" | |
29 | #include "internal.h" | |
30 | ||
31 | typedef struct XFaceContext { | |
32 | AVClass *class; | |
33 | uint8_t bitmap[XFACE_PIXELS]; ///< image used internally for decoding | |
34 | int max_line_len; ///< max line length for compressed data | |
35 | int set_header; ///< set X-Face header in the output | |
36 | } XFaceContext; | |
37 | ||
38 | static int all_same(char *bitmap, int w, int h) | |
39 | { | |
40 | char val, *row; | |
41 | int x; | |
42 | ||
43 | val = *bitmap; | |
44 | while (h--) { | |
45 | row = bitmap; | |
46 | x = w; | |
47 | while (x--) | |
48 | if (*(row++) != val) | |
49 | return 0; | |
50 | bitmap += XFACE_WIDTH; | |
51 | } | |
52 | return 1; | |
53 | } | |
54 | ||
55 | static int all_black(char *bitmap, int w, int h) | |
56 | { | |
57 | if (w > 3) { | |
58 | w /= 2; | |
59 | h /= 2; | |
60 | return (all_black(bitmap, w, h) && all_black(bitmap + w, w, h) && | |
61 | all_black(bitmap + XFACE_WIDTH * h, w, h) && | |
62 | all_black(bitmap + XFACE_WIDTH * h + w, w, h)); | |
63 | } else { | |
64 | /* at least one pixel in the 2x2 grid is non-zero */ | |
65 | return *bitmap || *(bitmap + 1) || | |
66 | *(bitmap + XFACE_WIDTH) || *(bitmap + XFACE_WIDTH + 1); | |
67 | } | |
68 | } | |
69 | ||
70 | static int all_white(char *bitmap, int w, int h) | |
71 | { | |
72 | return *bitmap == 0 && all_same(bitmap, w, h); | |
73 | } | |
74 | ||
75 | typedef struct { | |
76 | const ProbRange *prob_ranges[XFACE_PIXELS*2]; | |
77 | int prob_ranges_idx; | |
78 | } ProbRangesQueue; | |
79 | ||
80 | static inline int pq_push(ProbRangesQueue *pq, const ProbRange *p) | |
81 | { | |
82 | if (pq->prob_ranges_idx >= XFACE_PIXELS * 2 - 1) | |
83 | return -1; | |
84 | pq->prob_ranges[pq->prob_ranges_idx++] = p; | |
85 | return 0; | |
86 | } | |
87 | ||
88 | static void push_greys(ProbRangesQueue *pq, char *bitmap, int w, int h) | |
89 | { | |
90 | if (w > 3) { | |
91 | w /= 2; | |
92 | h /= 2; | |
93 | push_greys(pq, bitmap, w, h); | |
94 | push_greys(pq, bitmap + w, w, h); | |
95 | push_greys(pq, bitmap + XFACE_WIDTH * h, w, h); | |
96 | push_greys(pq, bitmap + XFACE_WIDTH * h + w, w, h); | |
97 | } else { | |
98 | const ProbRange *p = ff_xface_probranges_2x2 + | |
99 | *bitmap + | |
100 | 2 * *(bitmap + 1) + | |
101 | 4 * *(bitmap + XFACE_WIDTH) + | |
102 | 8 * *(bitmap + XFACE_WIDTH + 1); | |
103 | pq_push(pq, p); | |
104 | } | |
105 | } | |
106 | ||
107 | static void encode_block(char *bitmap, int w, int h, int level, ProbRangesQueue *pq) | |
108 | { | |
109 | if (all_white(bitmap, w, h)) { | |
110 | pq_push(pq, &ff_xface_probranges_per_level[level][XFACE_COLOR_WHITE]); | |
111 | } else if (all_black(bitmap, w, h)) { | |
112 | pq_push(pq, &ff_xface_probranges_per_level[level][XFACE_COLOR_BLACK]); | |
113 | push_greys(pq, bitmap, w, h); | |
114 | } else { | |
115 | pq_push(pq, &ff_xface_probranges_per_level[level][XFACE_COLOR_GREY]); | |
116 | w /= 2; | |
117 | h /= 2; | |
118 | level++; | |
119 | encode_block(bitmap, w, h, level, pq); | |
120 | encode_block(bitmap + w, w, h, level, pq); | |
121 | encode_block(bitmap + h * XFACE_WIDTH, w, h, level, pq); | |
122 | encode_block(bitmap + w + h * XFACE_WIDTH, w, h, level, pq); | |
123 | } | |
124 | } | |
125 | ||
126 | static av_cold int xface_encode_init(AVCodecContext *avctx) | |
127 | { | |
128 | avctx->coded_frame = av_frame_alloc(); | |
129 | if (!avctx->coded_frame) | |
130 | return AVERROR(ENOMEM); | |
131 | avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | static void push_integer(BigInt *b, const ProbRange *prange) | |
137 | { | |
138 | uint8_t r; | |
139 | ||
140 | ff_big_div(b, prange->range, &r); | |
141 | ff_big_mul(b, 0); | |
142 | ff_big_add(b, r + prange->offset); | |
143 | } | |
144 | ||
145 | static int xface_encode_frame(AVCodecContext *avctx, AVPacket *pkt, | |
146 | const AVFrame *frame, int *got_packet) | |
147 | { | |
148 | XFaceContext *xface = avctx->priv_data; | |
149 | ProbRangesQueue pq = {{ 0 }, 0}; | |
150 | uint8_t bitmap_copy[XFACE_PIXELS]; | |
151 | BigInt b = {0}; | |
152 | int i, j, k, ret = 0; | |
153 | const uint8_t *buf; | |
154 | uint8_t *p; | |
155 | char intbuf[XFACE_MAX_DIGITS]; | |
156 | ||
157 | if (avctx->width || avctx->height) { | |
158 | if (avctx->width != XFACE_WIDTH || avctx->height != XFACE_HEIGHT) { | |
159 | av_log(avctx, AV_LOG_ERROR, | |
160 | "Size value %dx%d not supported, only accepts a size of %dx%d\n", | |
161 | avctx->width, avctx->height, XFACE_WIDTH, XFACE_HEIGHT); | |
162 | return AVERROR(EINVAL); | |
163 | } | |
164 | } | |
165 | avctx->width = XFACE_WIDTH; | |
166 | avctx->height = XFACE_HEIGHT; | |
167 | ||
168 | /* convert image from MONOWHITE to 1=black 0=white bitmap */ | |
169 | buf = frame->data[0]; | |
170 | i = j = 0; | |
171 | do { | |
172 | for (k = 0; k < 8; k++) | |
173 | xface->bitmap[i++] = (buf[j]>>(7-k))&1; | |
174 | if (++j == XFACE_WIDTH/8) { | |
175 | buf += frame->linesize[0]; | |
176 | j = 0; | |
177 | } | |
178 | } while (i < XFACE_PIXELS); | |
179 | ||
180 | /* create a copy of bitmap */ | |
181 | memcpy(bitmap_copy, xface->bitmap, XFACE_PIXELS); | |
182 | ff_xface_generate_face(xface->bitmap, bitmap_copy); | |
183 | ||
184 | encode_block(xface->bitmap, 16, 16, 0, &pq); | |
185 | encode_block(xface->bitmap + 16, 16, 16, 0, &pq); | |
186 | encode_block(xface->bitmap + 32, 16, 16, 0, &pq); | |
187 | encode_block(xface->bitmap + XFACE_WIDTH * 16, 16, 16, 0, &pq); | |
188 | encode_block(xface->bitmap + XFACE_WIDTH * 16 + 16, 16, 16, 0, &pq); | |
189 | encode_block(xface->bitmap + XFACE_WIDTH * 16 + 32, 16, 16, 0, &pq); | |
190 | encode_block(xface->bitmap + XFACE_WIDTH * 32, 16, 16, 0, &pq); | |
191 | encode_block(xface->bitmap + XFACE_WIDTH * 32 + 16, 16, 16, 0, &pq); | |
192 | encode_block(xface->bitmap + XFACE_WIDTH * 32 + 32, 16, 16, 0, &pq); | |
193 | ||
194 | while (pq.prob_ranges_idx > 0) | |
195 | push_integer(&b, pq.prob_ranges[--pq.prob_ranges_idx]); | |
196 | ||
197 | /* write the inverted big integer in b to intbuf */ | |
198 | i = 0; | |
199 | while (b.nb_words) { | |
200 | uint8_t r; | |
201 | ff_big_div(&b, XFACE_PRINTS, &r); | |
202 | intbuf[i++] = r + XFACE_FIRST_PRINT; | |
203 | } | |
204 | ||
205 | if ((ret = ff_alloc_packet2(avctx, pkt, i+2)) < 0) | |
206 | return ret; | |
207 | ||
208 | /* revert the number, and close the buffer */ | |
209 | p = pkt->data; | |
210 | while (--i >= 0) | |
211 | *(p++) = intbuf[i]; | |
212 | *(p++) = '\n'; | |
213 | *(p++) = 0; | |
214 | ||
215 | pkt->flags |= AV_PKT_FLAG_KEY; | |
216 | *got_packet = 1; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static av_cold int xface_encode_close(AVCodecContext *avctx) | |
222 | { | |
223 | av_freep(&avctx->coded_frame); | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | AVCodec ff_xface_encoder = { | |
229 | .name = "xface", | |
230 | .long_name = NULL_IF_CONFIG_SMALL("X-face image"), | |
231 | .type = AVMEDIA_TYPE_VIDEO, | |
232 | .id = AV_CODEC_ID_XFACE, | |
233 | .priv_data_size = sizeof(XFaceContext), | |
234 | .init = xface_encode_init, | |
235 | .close = xface_encode_close, | |
236 | .encode2 = xface_encode_frame, | |
237 | .pix_fmts = (const enum PixelFormat[]) { AV_PIX_FMT_MONOWHITE, AV_PIX_FMT_NONE }, | |
238 | }; |