2 * MJPEG/AVI1 to JPEG/JFIF bitstream format filter
3 * Copyright (c) 2010 Adrian Daerr and Nicolas George
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
23 * Adapted from mjpeg2jpeg.c, with original copyright:
24 * Paris 2010 Adrian Daerr, public domain
29 #include "libavutil/error.h"
30 #include "libavutil/mem.h"
35 static const uint8_t jpeg_header
[] = {
38 0x00, 0x10, // APP0 header size (including
39 // this field, but excluding preceding)
40 0x4a, 0x46, 0x49, 0x46, 0x00, // ID string 'JFIF\0'
41 0x01, 0x01, // version
42 0x00, // bits per type
43 0x00, 0x00, // X density
44 0x00, 0x00, // Y density
45 0x00, // X thumbnail size
46 0x00, // Y thumbnail size
49 static const int dht_segment_size
= 420;
50 static const uint8_t dht_segment_head
[] = { 0xFF, 0xC4, 0x01, 0xA2, 0x00 };
51 static const uint8_t dht_segment_frag
[] = {
52 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
53 0x0a, 0x0b, 0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01,
54 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
57 static uint8_t *append(uint8_t *buf
, const uint8_t *src
, int size
)
59 memcpy(buf
, src
, size
);
63 static uint8_t *append_dht_segment(uint8_t *buf
)
65 buf
= append(buf
, dht_segment_head
, sizeof(dht_segment_head
));
66 buf
= append(buf
, avpriv_mjpeg_bits_dc_luminance
+ 1, 16);
67 buf
= append(buf
, dht_segment_frag
, sizeof(dht_segment_frag
));
68 buf
= append(buf
, avpriv_mjpeg_val_dc
, 12);
70 buf
= append(buf
, avpriv_mjpeg_bits_ac_luminance
+ 1, 16);
71 buf
= append(buf
, avpriv_mjpeg_val_ac_luminance
, 162);
73 buf
= append(buf
, avpriv_mjpeg_bits_ac_chrominance
+ 1, 16);
74 buf
= append(buf
, avpriv_mjpeg_val_ac_chrominance
, 162);
78 static int mjpeg2jpeg_filter(AVBitStreamFilterContext
*bsfc
,
79 AVCodecContext
*avctx
, const char *args
,
80 uint8_t **poutbuf
, int *poutbuf_size
,
81 const uint8_t *buf
, int buf_size
,
84 int input_skip
, output_size
;
85 uint8_t *output
, *out
;
88 av_log(avctx
, AV_LOG_ERROR
, "input is truncated\n");
89 return AVERROR_INVALIDDATA
;
91 if (memcmp("AVI1", buf
+ 6, 4)) {
92 av_log(avctx
, AV_LOG_ERROR
, "input is not MJPEG/AVI1\n");
93 return AVERROR_INVALIDDATA
;
95 input_skip
= (buf
[4] << 8) + buf
[5] + 4;
96 if (buf_size
< input_skip
) {
97 av_log(avctx
, AV_LOG_ERROR
, "input is truncated\n");
98 return AVERROR_INVALIDDATA
;
100 output_size
= buf_size
- input_skip
+
101 sizeof(jpeg_header
) + dht_segment_size
;
102 output
= out
= av_malloc(output_size
);
104 return AVERROR(ENOMEM
);
105 out
= append(out
, jpeg_header
, sizeof(jpeg_header
));
106 out
= append_dht_segment(out
);
107 out
= append(out
, buf
+ input_skip
, buf_size
- input_skip
);
109 *poutbuf_size
= output_size
;
113 AVBitStreamFilter ff_mjpeg2jpeg_bsf
= {
114 .name
= "mjpeg2jpeg",
115 .filter
= mjpeg2jpeg_filter
,