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 decoder, based on libcompface, by James Ashton.
28 #include "codec_internal.h"
32 static int pop_integer(BigInt *b, const ProbRange *pranges)
37 /* extract the last byte into r, and shift right b by 8 bits */
41 while (r < pranges->offset || r >= pranges->range + pranges->offset) {
45 ff_big_mul(b, pranges->range);
46 ff_big_add(b, r - pranges->offset);
50 static void pop_greys(BigInt *b, char *bitmap, int w, int h)
55 pop_greys(b, bitmap, w, h);
56 pop_greys(b, bitmap + w, w, h);
57 pop_greys(b, bitmap + XFACE_WIDTH * h, w, h);
58 pop_greys(b, bitmap + XFACE_WIDTH * h + w, w, h);
60 w = pop_integer(b, ff_xface_probranges_2x2);
61 if (w & 1) bitmap[0] = 1;
62 if (w & 2) bitmap[1] = 1;
63 if (w & 4) bitmap[XFACE_WIDTH] = 1;
64 if (w & 8) bitmap[XFACE_WIDTH + 1] = 1;
68 static void decode_block(BigInt *b, char *bitmap, int w, int h, int level)
70 switch (pop_integer(b, &ff_xface_probranges_per_level[level][0])) {
71 case XFACE_COLOR_WHITE:
73 case XFACE_COLOR_BLACK:
74 pop_greys(b, bitmap, w, h);
80 decode_block(b, bitmap, w, h, level);
81 decode_block(b, bitmap + w, w, h, level);
82 decode_block(b, bitmap + h * XFACE_WIDTH, w, h, level);
83 decode_block(b, bitmap + w + h * XFACE_WIDTH, w, h, level);
88 typedef struct XFaceContext {
89 uint8_t bitmap[XFACE_PIXELS]; ///< image used internally for decoding
92 static av_cold int xface_decode_init(AVCodecContext *avctx)
94 if (avctx->width || avctx->height) {
95 if (avctx->width != XFACE_WIDTH || avctx->height != XFACE_HEIGHT) {
96 av_log(avctx, AV_LOG_ERROR,
97 "Size value %dx%d not supported, only accepts a size of %dx%d\n",
98 avctx->width, avctx->height, XFACE_WIDTH, XFACE_HEIGHT);
99 return AVERROR(EINVAL);
103 avctx->width = XFACE_WIDTH;
104 avctx->height = XFACE_HEIGHT;
105 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
110 static int xface_decode_frame(AVCodecContext *avctx, AVFrame *frame,
111 int *got_frame, AVPacket *avpkt)
113 XFaceContext *xface = avctx->priv_data;
120 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
123 for (i = 0, k = 0; i < avpkt->size && avpkt->data[i]; i++) {
126 /* ignore invalid digits */
127 if (c < XFACE_FIRST_PRINT || c > XFACE_LAST_PRINT)
130 if (++k > XFACE_MAX_DIGITS) {
131 av_log(avctx, AV_LOG_WARNING,
132 "Buffer is longer than expected, truncating at byte %d\n", i);
135 ff_big_mul(&b, XFACE_PRINTS);
136 ff_big_add(&b, c - XFACE_FIRST_PRINT);
139 /* decode image and put it in bitmap */
140 memset(xface->bitmap, 0, XFACE_PIXELS);
142 decode_block(&b, buf, 16, 16, 0);
143 decode_block(&b, buf + 16, 16, 16, 0);
144 decode_block(&b, buf + 32, 16, 16, 0);
145 decode_block(&b, buf + XFACE_WIDTH * 16, 16, 16, 0);
146 decode_block(&b, buf + XFACE_WIDTH * 16 + 16, 16, 16, 0);
147 decode_block(&b, buf + XFACE_WIDTH * 16 + 32, 16, 16, 0);
148 decode_block(&b, buf + XFACE_WIDTH * 32 , 16, 16, 0);
149 decode_block(&b, buf + XFACE_WIDTH * 32 + 16, 16, 16, 0);
150 decode_block(&b, buf + XFACE_WIDTH * 32 + 32, 16, 16, 0);
152 ff_xface_generate_face(xface->bitmap, xface->bitmap);
154 /* convert image from 1=black 0=white bitmap to MONOWHITE */
155 buf = frame->data[0];
156 for (i = 0, j = 0, k = 0, byte = 0; i < XFACE_PIXELS; i++) {
157 byte += xface->bitmap[i];
165 if (j == XFACE_WIDTH/8) {
167 buf += frame->linesize[0];
176 const FFCodec ff_xface_decoder = {
178 CODEC_LONG_NAME("X-face image"),
179 .p.type = AVMEDIA_TYPE_VIDEO,
180 .p.id = AV_CODEC_ID_XFACE,
181 .p.capabilities = AV_CODEC_CAP_DR1,
182 .priv_data_size = sizeof(XFaceContext),
183 .init = xface_decode_init,
184 FF_CODEC_DECODE_CB(xface_decode_frame),
185 .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE, AV_PIX_FMT_NONE },