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 "encode.h"
25 #include "internal.h"
26 #include "mathops.h"
27 
28 #define ANSI_MIN_READLINE 509
29 
31  const AVFrame *p, int *got_packet)
32 {
33  int i, j, l, commas, ret, size, linesize, lineout, rowsout;
34  uint8_t *ptr, *buf;
35 
36  linesize = lineout = (avctx->width + 7) / 8;
37  commas = avctx->height * linesize;
38 
39  /* ANSI worst case minimum readline is 509 chars. */
40  rowsout = avctx->height;
41  if (lineout > (ANSI_MIN_READLINE / 6)) {
42  lineout = ANSI_MIN_READLINE / 6;
43  rowsout = (commas + lineout - 1) / lineout;
44  }
45 
46  size = rowsout * (lineout * 6 + 1) + 106;
47  if ((ret = ff_alloc_packet(avctx, pkt, size)) < 0)
48  return ret;
49 
50  buf = pkt->data;
51  ptr = p->data[0];
52 
53  buf += snprintf(buf, 32, "#define image_width %u\n", avctx->width);
54  buf += snprintf(buf, 33, "#define image_height %u\n", avctx->height);
55  buf += snprintf(buf, 39, "static unsigned char image_bits[] = {\n");
56  for (i = 0, l = lineout; i < avctx->height; i++) {
57  for (j = 0; j < linesize; j++) {
58  buf += snprintf(buf, 6, " 0x%02X", ff_reverse[*ptr++]);
59  if (--commas <= 0) {
60  buf += snprintf(buf, 2, "\n");
61  break;
62  }
63  buf += snprintf(buf, 2, ",");
64  if (--l <= 0) {
65  buf += snprintf(buf, 2, "\n");
66  l = lineout;
67  }
68  }
69  ptr += p->linesize[0] - linesize;
70  }
71  buf += snprintf(buf, 5, " };\n");
72 
73  pkt->size = buf - pkt->data;
75  *got_packet = 1;
76  return 0;
77 }
78 
80  .name = "xbm",
81  .long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
82  .type = AVMEDIA_TYPE_VIDEO,
83  .id = AV_CODEC_ID_XBM,
84  .encode2 = xbm_encode_frame,
85  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE,
87 };
AVCodec
AVCodec.
Definition: codec.h:197
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:365
ANSI_MIN_READLINE
#define ANSI_MIN_READLINE
Definition: xbmenc.c:28
encode.h
ff_reverse
const uint8_t ff_reverse[256]
Definition: reverse.c:23
AV_PIX_FMT_MONOWHITE
@ AV_PIX_FMT_MONOWHITE
Y , 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsb.
Definition: pixfmt.h:75
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:396
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
pkt
AVPacket * pkt
Definition: movenc.c:59
mathops.h
xbm_encode_frame
static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *p, int *got_packet)
Definition: xbmenc.c:30
AVPacket::size
int size
Definition: packet.h:366
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
size
int size
Definition: twinvq_data.h:10344
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:371
i
int i
Definition: input.c:407
ff_xbm_encoder
const AVCodec ff_xbm_encoder
Definition: xbmenc.c:79
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
AVCodecContext::height
int height
Definition: avcodec.h:557
AV_CODEC_ID_XBM
@ AV_CODEC_ID_XBM
Definition: codec_id.h:210
avcodec.h
ret
ret
Definition: filter_design.txt:187
AVCodecContext
main external API structure.
Definition: avcodec.h:384
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVPacket
This structure stores compressed data.
Definition: packet.h:342
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:557
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
snprintf
#define snprintf
Definition: snprintf.h:34
ff_alloc_packet
int ff_alloc_packet(AVCodecContext *avctx, AVPacket *avpkt, int64_t size)
Check AVPacket size and allocate data.
Definition: encode.c:33