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 "avcodec.h"
24 #include "internal.h"
25 #include "mathops.h"
26
27 #define ANSI_MIN_READLINE 509
28
xbm_encode_frame(AVCodecContext * avctx,AVPacket * pkt,const AVFrame * p,int * got_packet)29 static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
30 const AVFrame *p, int *got_packet)
31 {
32 int i, j, l, commas, ret, size, linesize, lineout, rowsout;
33 uint8_t *ptr, *buf;
34
35 linesize = lineout = (avctx->width + 7) / 8;
36 commas = avctx->height * linesize;
37
38 /* ANSI worst case minimum readline is 509 chars. */
39 rowsout = avctx->height;
40 if (lineout > (ANSI_MIN_READLINE / 6)) {
41 lineout = ANSI_MIN_READLINE / 6;
42 rowsout = (commas + lineout - 1) / lineout;
43 }
44
45 size = rowsout * (lineout * 6 + 1) + 106;
46 if ((ret = ff_alloc_packet2(avctx, pkt, size, 0)) < 0)
47 return ret;
48
49 buf = pkt->data;
50 ptr = p->data[0];
51
52 buf += snprintf(buf, 32, "#define image_width %u\n", avctx->width);
53 buf += snprintf(buf, 33, "#define image_height %u\n", avctx->height);
54 buf += snprintf(buf, 39, "static unsigned char image_bits[] = {\n");
55 for (i = 0, l = lineout; i < avctx->height; i++) {
56 for (j = 0; j < linesize; j++) {
57 buf += snprintf(buf, 6, " 0x%02X", ff_reverse[*ptr++]);
58 if (--commas <= 0) {
59 buf += snprintf(buf, 2, "\n");
60 break;
61 }
62 buf += snprintf(buf, 2, ",");
63 if (--l <= 0) {
64 buf += snprintf(buf, 2, "\n");
65 l = lineout;
66 }
67 }
68 ptr += p->linesize[0] - linesize;
69 }
70 buf += snprintf(buf, 5, " };\n");
71
72 pkt->size = buf - pkt->data;
73 pkt->flags |= AV_PKT_FLAG_KEY;
74 *got_packet = 1;
75 return 0;
76 }
77
78 AVCodec ff_xbm_encoder = {
79 .name = "xbm",
80 .long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
81 .type = AVMEDIA_TYPE_VIDEO,
82 .id = AV_CODEC_ID_XBM,
83 .encode2 = xbm_encode_frame,
84 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE,
85 AV_PIX_FMT_NONE },
86 };
87