FFmpeg
xbmenc.c
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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 
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 
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,
86 };
This structure describes decoded (raw) audio or video data.
Definition: frame.h:314
static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *p, int *got_packet)
Definition: xbmenc.c:29
const uint8_t ff_reverse[256]
Definition: reverse.c:23
int size
Definition: packet.h:364
static AVPacket pkt
AVCodec.
Definition: codec.h:190
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: encode.c:33
uint8_t
uint8_t * data
Definition: packet.h:363
ptrdiff_t size
Definition: opengl_enc.c:100
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:401
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:115
const char * name
Name of the codec implementation.
Definition: codec.h:197
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:369
int width
picture width / height.
Definition: avcodec.h:704
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:345
main external API structure.
Definition: avcodec.h:531
#define ANSI_MIN_READLINE
Definition: xbmenc.c:27
AVCodec ff_xbm_encoder
Definition: xbmenc.c:78
#define snprintf
Definition: snprintf.h:34
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:328
common internal api header.
Y , 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsb...
Definition: pixfmt.h:75
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
This structure stores compressed data.
Definition: packet.h:340
int i
Definition: input.c:407