2 * Copyright (c) 1990 James Ashton - Sydney University
3 * Copyright (c) 2012 Stefano Sabatini
5 * This file is part of FFmpeg.
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.
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.
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
24 * X-Face encoder, based on libcompface, by James Ashton.
30 #include "libavutil/avassert.h"
32 typedef struct XFaceContext {
34 uint8_t bitmap[XFACE_PIXELS]; ///< image used internally for decoding
35 int max_line_len; ///< max line length for compressed data
36 int set_header; ///< set X-Face header in the output
39 static int all_same(char *bitmap, int w, int h)
51 bitmap += XFACE_WIDTH;
56 static int all_black(char *bitmap, int w, int h)
61 return (all_black(bitmap, w, h) && all_black(bitmap + w, w, h) &&
62 all_black(bitmap + XFACE_WIDTH * h, w, h) &&
63 all_black(bitmap + XFACE_WIDTH * h + w, w, h));
65 /* at least one pixel in the 2x2 grid is non-zero */
66 return *bitmap || *(bitmap + 1) ||
67 *(bitmap + XFACE_WIDTH) || *(bitmap + XFACE_WIDTH + 1);
71 static int all_white(char *bitmap, int w, int h)
73 return *bitmap == 0 && all_same(bitmap, w, h);
77 ProbRange prob_ranges[XFACE_PIXELS*2];
81 static inline int pq_push(ProbRangesQueue *pq, const ProbRange *p)
83 if (pq->prob_ranges_idx >= XFACE_PIXELS * 2 - 1)
85 pq->prob_ranges[pq->prob_ranges_idx++] = *p;
89 static void push_greys(ProbRangesQueue *pq, char *bitmap, int w, int h)
94 push_greys(pq, bitmap, w, h);
95 push_greys(pq, bitmap + w, w, h);
96 push_greys(pq, bitmap + XFACE_WIDTH * h, w, h);
97 push_greys(pq, bitmap + XFACE_WIDTH * h + w, w, h);
99 const ProbRange *p = ff_xface_probranges_2x2 +
102 4 * *(bitmap + XFACE_WIDTH) +
103 8 * *(bitmap + XFACE_WIDTH + 1);
108 static void encode_block(char *bitmap, int w, int h, int level, ProbRangesQueue *pq)
110 if (all_white(bitmap, w, h)) {
111 pq_push(pq, &ff_xface_probranges_per_level[level][XFACE_COLOR_WHITE]);
112 } else if (all_black(bitmap, w, h)) {
113 pq_push(pq, &ff_xface_probranges_per_level[level][XFACE_COLOR_BLACK]);
114 push_greys(pq, bitmap, w, h);
116 pq_push(pq, &ff_xface_probranges_per_level[level][XFACE_COLOR_GREY]);
120 encode_block(bitmap, w, h, level, pq);
121 encode_block(bitmap + w, w, h, level, pq);
122 encode_block(bitmap + h * XFACE_WIDTH, w, h, level, pq);
123 encode_block(bitmap + w + h * XFACE_WIDTH, w, h, level, pq);
127 static av_cold int xface_encode_init(AVCodecContext *avctx)
129 avctx->coded_frame = av_frame_alloc();
130 if (!avctx->coded_frame)
131 return AVERROR(ENOMEM);
132 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
137 static void push_integer(BigInt *b, const ProbRange *prange)
141 ff_big_div(b, prange->range, &r);
143 ff_big_add(b, r + prange->offset);
146 static int xface_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
147 const AVFrame *frame, int *got_packet)
149 XFaceContext *xface = avctx->priv_data;
150 ProbRangesQueue pq = {{{ 0 }}, 0};
151 uint8_t bitmap_copy[XFACE_PIXELS];
153 int i, j, k, ret = 0;
156 char intbuf[XFACE_MAX_DIGITS];
158 if (avctx->width || avctx->height) {
159 if (avctx->width != XFACE_WIDTH || avctx->height != XFACE_HEIGHT) {
160 av_log(avctx, AV_LOG_ERROR,
161 "Size value %dx%d not supported, only accepts a size of %dx%d\n",
162 avctx->width, avctx->height, XFACE_WIDTH, XFACE_HEIGHT);
163 return AVERROR(EINVAL);
166 avctx->width = XFACE_WIDTH;
167 avctx->height = XFACE_HEIGHT;
169 /* convert image from MONOWHITE to 1=black 0=white bitmap */
170 buf = frame->data[0];
173 for (k = 0; k < 8; k++)
174 xface->bitmap[i++] = (buf[j]>>(7-k))&1;
175 if (++j == XFACE_WIDTH/8) {
176 buf += frame->linesize[0];
179 } while (i < XFACE_PIXELS);
181 /* create a copy of bitmap */
182 memcpy(bitmap_copy, xface->bitmap, XFACE_PIXELS);
183 ff_xface_generate_face(xface->bitmap, bitmap_copy);
185 encode_block(xface->bitmap, 16, 16, 0, &pq);
186 encode_block(xface->bitmap + 16, 16, 16, 0, &pq);
187 encode_block(xface->bitmap + 32, 16, 16, 0, &pq);
188 encode_block(xface->bitmap + XFACE_WIDTH * 16, 16, 16, 0, &pq);
189 encode_block(xface->bitmap + XFACE_WIDTH * 16 + 16, 16, 16, 0, &pq);
190 encode_block(xface->bitmap + XFACE_WIDTH * 16 + 32, 16, 16, 0, &pq);
191 encode_block(xface->bitmap + XFACE_WIDTH * 32, 16, 16, 0, &pq);
192 encode_block(xface->bitmap + XFACE_WIDTH * 32 + 16, 16, 16, 0, &pq);
193 encode_block(xface->bitmap + XFACE_WIDTH * 32 + 32, 16, 16, 0, &pq);
195 while (pq.prob_ranges_idx > 0)
196 push_integer(&b, &pq.prob_ranges[--pq.prob_ranges_idx]);
198 /* write the inverted big integer in b to intbuf */
200 av_assert0(b.nb_words < XFACE_MAX_WORDS);
203 ff_big_div(&b, XFACE_PRINTS, &r);
204 av_assert0(i < sizeof(intbuf));
205 intbuf[i++] = r + XFACE_FIRST_PRINT;
208 if ((ret = ff_alloc_packet2(avctx, pkt, i+2)) < 0)
211 /* revert the number, and close the buffer */
218 pkt->flags |= AV_PKT_FLAG_KEY;
224 static av_cold int xface_encode_close(AVCodecContext *avctx)
226 av_frame_free(&avctx->coded_frame);
231 AVCodec ff_xface_encoder = {
233 .long_name = NULL_IF_CONFIG_SMALL("X-face image"),
234 .type = AVMEDIA_TYPE_VIDEO,
235 .id = AV_CODEC_ID_XFACE,
236 .priv_data_size = sizeof(XFaceContext),
237 .init = xface_encode_init,
238 .close = xface_encode_close,
239 .encode2 = xface_encode_frame,
240 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE, AV_PIX_FMT_NONE },