2 * Copyright (c) 1990 James Ashton - Sydney University
3 * Copyright (c) 2012 Stefano Sabatini
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * X-Face encoder, based on libcompface, by James Ashton.
30 #include "libavutil/avassert.h"
32 typedef struct XFaceContext
{
34 uint8_t bitmap
[XFACE_PIXELS
]; ///< image used internally for decoding
35 int max_line_len
; ///< max line length for compressed data
36 int set_header
; ///< set X-Face header in the output
39 static int all_same(char *bitmap
, int w
, int h
)
51 bitmap
+= XFACE_WIDTH
;
56 static int all_black(char *bitmap
, int w
, int h
)
61 return (all_black(bitmap
, w
, h
) && all_black(bitmap
+ w
, w
, h
) &&
62 all_black(bitmap
+ XFACE_WIDTH
* h
, w
, h
) &&
63 all_black(bitmap
+ XFACE_WIDTH
* h
+ w
, w
, h
));
65 /* at least one pixel in the 2x2 grid is non-zero */
66 return *bitmap
|| *(bitmap
+ 1) ||
67 *(bitmap
+ XFACE_WIDTH
) || *(bitmap
+ XFACE_WIDTH
+ 1);
71 static int all_white(char *bitmap
, int w
, int h
)
73 return *bitmap
== 0 && all_same(bitmap
, w
, h
);
77 ProbRange prob_ranges
[XFACE_PIXELS
*2];
81 static inline int pq_push(ProbRangesQueue
*pq
, const ProbRange
*p
)
83 if (pq
->prob_ranges_idx
>= XFACE_PIXELS
* 2 - 1)
85 pq
->prob_ranges
[pq
->prob_ranges_idx
++] = *p
;
89 static void push_greys(ProbRangesQueue
*pq
, char *bitmap
, int w
, int h
)
94 push_greys(pq
, bitmap
, w
, h
);
95 push_greys(pq
, bitmap
+ w
, w
, h
);
96 push_greys(pq
, bitmap
+ XFACE_WIDTH
* h
, w
, h
);
97 push_greys(pq
, bitmap
+ XFACE_WIDTH
* h
+ w
, w
, h
);
99 const ProbRange
*p
= ff_xface_probranges_2x2
+
102 4 * *(bitmap
+ XFACE_WIDTH
) +
103 8 * *(bitmap
+ XFACE_WIDTH
+ 1);
108 static void encode_block(char *bitmap
, int w
, int h
, int level
, ProbRangesQueue
*pq
)
110 if (all_white(bitmap
, w
, h
)) {
111 pq_push(pq
, &ff_xface_probranges_per_level
[level
][XFACE_COLOR_WHITE
]);
112 } else if (all_black(bitmap
, w
, h
)) {
113 pq_push(pq
, &ff_xface_probranges_per_level
[level
][XFACE_COLOR_BLACK
]);
114 push_greys(pq
, bitmap
, w
, h
);
116 pq_push(pq
, &ff_xface_probranges_per_level
[level
][XFACE_COLOR_GREY
]);
120 encode_block(bitmap
, w
, h
, level
, pq
);
121 encode_block(bitmap
+ w
, w
, h
, level
, pq
);
122 encode_block(bitmap
+ h
* XFACE_WIDTH
, w
, h
, level
, pq
);
123 encode_block(bitmap
+ w
+ h
* XFACE_WIDTH
, w
, h
, level
, pq
);
127 static av_cold
int xface_encode_init(AVCodecContext
*avctx
)
129 avctx
->coded_frame
= av_frame_alloc();
130 if (!avctx
->coded_frame
)
131 return AVERROR(ENOMEM
);
132 avctx
->coded_frame
->pict_type
= AV_PICTURE_TYPE_I
;
137 static void push_integer(BigInt
*b
, const ProbRange
*prange
)
141 ff_big_div(b
, prange
->range
, &r
);
143 ff_big_add(b
, r
+ prange
->offset
);
146 static int xface_encode_frame(AVCodecContext
*avctx
, AVPacket
*pkt
,
147 const AVFrame
*frame
, int *got_packet
)
149 XFaceContext
*xface
= avctx
->priv_data
;
150 ProbRangesQueue pq
= {{{ 0 }}, 0};
151 uint8_t bitmap_copy
[XFACE_PIXELS
];
153 int i
, j
, k
, ret
= 0;
156 char intbuf
[XFACE_MAX_DIGITS
];
158 if (avctx
->width
|| avctx
->height
) {
159 if (avctx
->width
!= XFACE_WIDTH
|| avctx
->height
!= XFACE_HEIGHT
) {
160 av_log(avctx
, AV_LOG_ERROR
,
161 "Size value %dx%d not supported, only accepts a size of %dx%d\n",
162 avctx
->width
, avctx
->height
, XFACE_WIDTH
, XFACE_HEIGHT
);
163 return AVERROR(EINVAL
);
166 avctx
->width
= XFACE_WIDTH
;
167 avctx
->height
= XFACE_HEIGHT
;
169 /* convert image from MONOWHITE to 1=black 0=white bitmap */
170 buf
= frame
->data
[0];
173 for (k
= 0; k
< 8; k
++)
174 xface
->bitmap
[i
++] = (buf
[j
]>>(7-k
))&1;
175 if (++j
== XFACE_WIDTH
/8) {
176 buf
+= frame
->linesize
[0];
179 } while (i
< XFACE_PIXELS
);
181 /* create a copy of bitmap */
182 memcpy(bitmap_copy
, xface
->bitmap
, XFACE_PIXELS
);
183 ff_xface_generate_face(xface
->bitmap
, bitmap_copy
);
185 encode_block(xface
->bitmap
, 16, 16, 0, &pq
);
186 encode_block(xface
->bitmap
+ 16, 16, 16, 0, &pq
);
187 encode_block(xface
->bitmap
+ 32, 16, 16, 0, &pq
);
188 encode_block(xface
->bitmap
+ XFACE_WIDTH
* 16, 16, 16, 0, &pq
);
189 encode_block(xface
->bitmap
+ XFACE_WIDTH
* 16 + 16, 16, 16, 0, &pq
);
190 encode_block(xface
->bitmap
+ XFACE_WIDTH
* 16 + 32, 16, 16, 0, &pq
);
191 encode_block(xface
->bitmap
+ XFACE_WIDTH
* 32, 16, 16, 0, &pq
);
192 encode_block(xface
->bitmap
+ XFACE_WIDTH
* 32 + 16, 16, 16, 0, &pq
);
193 encode_block(xface
->bitmap
+ XFACE_WIDTH
* 32 + 32, 16, 16, 0, &pq
);
195 while (pq
.prob_ranges_idx
> 0)
196 push_integer(&b
, &pq
.prob_ranges
[--pq
.prob_ranges_idx
]);
198 /* write the inverted big integer in b to intbuf */
200 av_assert0(b
.nb_words
< XFACE_MAX_WORDS
);
203 ff_big_div(&b
, XFACE_PRINTS
, &r
);
204 av_assert0(i
< sizeof(intbuf
));
205 intbuf
[i
++] = r
+ XFACE_FIRST_PRINT
;
208 if ((ret
= ff_alloc_packet2(avctx
, pkt
, i
+2)) < 0)
211 /* revert the number, and close the buffer */
218 pkt
->flags
|= AV_PKT_FLAG_KEY
;
224 static av_cold
int xface_encode_close(AVCodecContext
*avctx
)
226 av_freep(&avctx
->coded_frame
);
231 AVCodec ff_xface_encoder
= {
233 .long_name
= NULL_IF_CONFIG_SMALL("X-face image"),
234 .type
= AVMEDIA_TYPE_VIDEO
,
235 .id
= AV_CODEC_ID_XFACE
,
236 .priv_data_size
= sizeof(XFaceContext
),
237 .init
= xface_encode_init
,
238 .close
= xface_encode_close
,
239 .encode2
= xface_encode_frame
,
240 .pix_fmts
= (const enum PixelFormat
[]) { AV_PIX_FMT_MONOWHITE
, AV_PIX_FMT_NONE
},