1 /*
2 * XBM image format
3 *
4 * Copyright (c) 2012 Paul B Mahol
5 *
6 * This file is part of FFmpeg.
7 *
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.
12 *
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.
17 *
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
21 */
22
23 #include "libavutil/reverse.h"
24 #include "avcodec.h"
25 #include "codec_internal.h"
26 #include "encode.h"
27 #include "mathops.h"
28
29 #define ANSI_MIN_READLINE 509
30
xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *p, int *got_packet)31 static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
32 const AVFrame *p, int *got_packet)
33 {
34 int i, j, l, commas, ret, size, linesize, lineout, rowsout;
35 uint8_t *ptr, *buf;
36
37 linesize = lineout = (avctx->width + 7) / 8;
38 commas = avctx->height * linesize;
39
40 /* ANSI worst case minimum readline is 509 chars. */
41 rowsout = avctx->height;
42 if (lineout > (ANSI_MIN_READLINE / 6)) {
43 lineout = ANSI_MIN_READLINE / 6;
44 rowsout = (commas + lineout - 1) / lineout;
45 }
46
47 size = rowsout * (lineout * 6 + 1) + 106;
48 if ((ret = ff_alloc_packet(avctx, pkt, size)) < 0)
49 return ret;
50
51 buf = pkt->data;
52 ptr = p->data[0];
53
54 buf += snprintf(buf, 32, "#define image_width %u\n", avctx->width);
55 buf += snprintf(buf, 33, "#define image_height %u\n", avctx->height);
56 buf += snprintf(buf, 39, "static unsigned char image_bits[] = {\n");
57 for (i = 0, l = lineout; i < avctx->height; i++) {
58 for (j = 0; j < linesize; j++) {
59 buf += snprintf(buf, 6, " 0x%02X", ff_reverse[*ptr++]);
60 if (--commas <= 0) {
61 buf += snprintf(buf, 2, "\n");
62 break;
63 }
64 buf += snprintf(buf, 2, ",");
65 if (--l <= 0) {
66 buf += snprintf(buf, 2, "\n");
67 l = lineout;
68 }
69 }
70 ptr += p->linesize[0] - linesize;
71 }
72 buf += snprintf(buf, 5, " };\n");
73
74 pkt->size = buf - pkt->data;
75 *got_packet = 1;
76 return 0;
77 }
78
79 const FFCodec ff_xbm_encoder = {
80 .p.name = "xbm",
81 .p.long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
82 .p.type = AVMEDIA_TYPE_VIDEO,
83 .p.id = AV_CODEC_ID_XBM,
84 FF_CODEC_ENCODE_CB(xbm_encode_frame),
85 .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE,
86 AV_PIX_FMT_NONE },
87 };
88