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 int keylen = strlen(key);
43 const uint8_t *e = end - keylen;
46 if (!memcmp(p, key, keylen))
55 int64_t ret = strtol(p, &eptr, 10);
56 if ((const uint8_t *)eptr != p)
62 static int xbm_decode_frame(AVCodecContext *avctx, void *data,
63 int *got_frame, AVPacket *avpkt)
66 int ret, linesize, i, j;
69 const uint8_t *end, *ptr = avpkt->data;
73 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
74 end = avpkt->data + avpkt->size;
76 width = parse_str_int(avpkt->data, end, "_width");
77 height = parse_str_int(avpkt->data, end, "_height");
79 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
82 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
85 // goto start of image data
86 next = memchr(ptr, '{', avpkt->size);
88 next = memchr(ptr, '(', avpkt->size);
90 return AVERROR_INVALIDDATA;
93 linesize = (avctx->width + 7) / 8;
94 for (i = 0; i < avctx->height; i++) {
95 dst = p->data[0] + i * p->linesize[0];
96 for (j = 0; j < linesize; j++) {
99 while (ptr < end && *ptr != 'x' && *ptr != '$')
103 if (ptr < end && av_isxdigit(*ptr)) {
104 val = convert(*ptr++);
105 if (av_isxdigit(*ptr))
106 val = (val << 4) + convert(*ptr++);
107 *dst++ = ff_reverse[val];
108 if (av_isxdigit(*ptr) && j+1 < linesize) {
110 val = convert(*ptr++);
111 if (av_isxdigit(*ptr))
112 val = (val << 4) + convert(*ptr++);
113 *dst++ = ff_reverse[val];
116 av_log(avctx, AV_LOG_ERROR,
117 "Unexpected data at %.8s.\n", ptr);
118 return AVERROR_INVALIDDATA;
124 p->pict_type = AV_PICTURE_TYPE_I;
131 AVCodec ff_xbm_decoder = {
133 .long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
134 .type = AVMEDIA_TYPE_VIDEO,
135 .id = AV_CODEC_ID_XBM,
136 .decode = xbm_decode_frame,
137 .capabilities = AV_CODEC_CAP_DR1,