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
26 static av_cold int xbm_decode_init(AVCodecContext *avctx)
28 avctx->coded_frame = avcodec_alloc_frame();
29 if (!avctx->coded_frame)
30 return AVERROR(ENOMEM);
35 static int convert(uint8_t x)
46 static int xbm_decode_frame(AVCodecContext *avctx, void *data,
47 int *data_size, AVPacket *avpkt)
49 AVFrame *p = avctx->coded_frame;
50 const uint8_t *end, *ptr = avpkt->data;
52 int ret, linesize, i, j;
54 end = avpkt->data + avpkt->size;
55 while (!avctx->width || !avctx->height) {
59 ptr += strcspn(ptr, "#");
60 if (sscanf(ptr, "#define %256s %u", name, &number) != 2) {
61 av_log(avctx, AV_LOG_ERROR, "Unexpected preprocessor directive\n");
62 return AVERROR_INVALIDDATA;
66 if ((len > 6) && !avctx->height && !memcmp(name + len - 7, "_height", 7)) {
67 avctx->height = number;
68 } else if ((len > 5) && !avctx->width && !memcmp(name + len - 6, "_width", 6)) {
69 avctx->width = number;
71 av_log(avctx, AV_LOG_ERROR, "Unknown define '%s'\n", name);
72 return AVERROR_INVALIDDATA;
74 ptr += strcspn(ptr, "\n\r") + 1;
77 avctx->pix_fmt = PIX_FMT_MONOWHITE;
80 avctx->release_buffer(avctx, p);
83 if ((ret = avctx->get_buffer(avctx, p)) < 0)
86 // goto start of image data
87 ptr += strcspn(ptr, "{") + 1;
89 linesize = (avctx->width + 7) / 8;
90 for (i = 0; i < avctx->height; i++) {
91 dst = p->data[0] + i * p->linesize[0];
92 for (j = 0; j < linesize; j++) {
95 ptr += strcspn(ptr, "x") + 1;
96 if (ptr < end && isxdigit(*ptr)) {
100 val = (val << 4) + convert(*ptr);
101 *dst++ = av_reverse[val];
103 av_log(avctx, AV_LOG_ERROR, "Unexpected data at '%.8s'\n", ptr);
104 return AVERROR_INVALIDDATA;
110 p->pict_type = AV_PICTURE_TYPE_I;
112 *data_size = sizeof(AVFrame);
113 *(AVFrame *)data = *p;
118 static av_cold int xbm_decode_close(AVCodecContext *avctx)
120 if (avctx->coded_frame->data[0])
121 avctx->release_buffer(avctx, avctx->coded_frame);
123 av_freep(&avctx->coded_frame);
128 AVCodec ff_xbm_decoder = {
130 .type = AVMEDIA_TYPE_VIDEO,
132 .init = xbm_decode_init,
133 .close = xbm_decode_close,
134 .decode = xbm_decode_frame,
135 .capabilities = CODEC_CAP_DR1,
136 .long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),