4 * Copyright (c) 2012 Paul B Mahol
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavutil/avstring.h"
29 static int convert(uint8_t x)
40 static int parse_str_int(const uint8_t *p, const uint8_t *end, const uint8_t *key)
42 for(; p<end - strlen(key); p++) {
43 if (!memcmp(p, key, strlen(key)))
52 int64_t ret = strtol(p, &eptr, 10);
53 if ((const uint8_t *)eptr != p)
59 static int xbm_decode_frame(AVCodecContext *avctx, void *data,
60 int *got_frame, AVPacket *avpkt)
63 int ret, linesize, i, j;
66 const uint8_t *end, *ptr = avpkt->data;
70 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
71 end = avpkt->data + avpkt->size;
73 width = parse_str_int(avpkt->data, end, "_width");
74 height = parse_str_int(avpkt->data, end, "_height");
76 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
79 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
82 // goto start of image data
83 next = memchr(ptr, '{', avpkt->size);
85 next = memchr(ptr, '(', avpkt->size);
87 return AVERROR_INVALIDDATA;
90 linesize = (avctx->width + 7) / 8;
91 for (i = 0; i < avctx->height; i++) {
92 dst = p->data[0] + i * p->linesize[0];
93 for (j = 0; j < linesize; j++) {
96 while (ptr < end && *ptr != 'x' && *ptr != '$')
100 if (ptr < end && av_isxdigit(*ptr)) {
101 val = convert(*ptr++);
102 if (av_isxdigit(*ptr))
103 val = (val << 4) + convert(*ptr++);
104 *dst++ = ff_reverse[val];
105 if (av_isxdigit(*ptr) && j+1 < linesize) {
107 val = convert(*ptr++);
108 if (av_isxdigit(*ptr))
109 val = (val << 4) + convert(*ptr++);
110 *dst++ = ff_reverse[val];
113 av_log(avctx, AV_LOG_ERROR,
114 "Unexpected data at %.8s.\n", ptr);
115 return AVERROR_INVALIDDATA;
121 p->pict_type = AV_PICTURE_TYPE_I;
128 AVCodec ff_xbm_decoder = {
130 .long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
131 .type = AVMEDIA_TYPE_VIDEO,
132 .id = AV_CODEC_ID_XBM,
133 .decode = xbm_decode_frame,
134 .capabilities = AV_CODEC_CAP_DR1,