1 /*
2 * MJPEG A dump header bitstream filter
3 * Copyright (c) 2006 Baptiste Coudurier
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file
24 * MJPEG A dump header bitstream filter
25 * modifies bitstream to be decoded by quicktime
26 */
27
31
32
34 uint8_t **poutbuf,
int *poutbuf_size,
35 const uint8_t *
buf,
int buf_size,
int keyframe)
36 {
38 unsigned dqt = 0, dht = 0, sof0 = 0;
39 int i;
40
43 return 0;
44 }
45
46 *poutbuf_size = 0;
48 poutbufp = *poutbuf;
49 bytestream_put_byte(&poutbufp, 0xff);
50 bytestream_put_byte(&poutbufp,
SOI);
51 bytestream_put_byte(&poutbufp, 0xff);
52 bytestream_put_byte(&poutbufp,
APP1);
53 bytestream_put_be16(&poutbufp, 42); /* size */
54 bytestream_put_be32(&poutbufp, 0);
56 bytestream_put_be32(&poutbufp, buf_size + 44); /* field size */
57 bytestream_put_be32(&poutbufp, buf_size + 44); /* pad field size */
58 bytestream_put_be32(&poutbufp, 0); /* next ptr */
59
60 for (i = 0; i < buf_size - 1; i++) {
61 if (buf[i] == 0xff) {
62 switch (buf[i + 1]) {
63 case DQT: dqt = i + 46;
break;
64 case DHT: dht = i + 46;
break;
65 case SOF0: sof0 = i + 46;
break;
67 bytestream_put_be32(&poutbufp, dqt); /* quant off */
68 bytestream_put_be32(&poutbufp, dht); /* huff off */
69 bytestream_put_be32(&poutbufp, sof0); /* image off */
70 bytestream_put_be32(&poutbufp, i + 46); /* scan off */
71 bytestream_put_be32(&poutbufp, i + 46 +
AV_RB16(buf + i + 2));
/* data off */
73 *poutbuf_size = poutbufp - *poutbuf;
74 return 1;
78 memcpy(*poutbuf, buf, buf_size);
79 *poutbuf_size = buf_size;
80 return 1;
81 }
82 }
83 }
84 }
87 return 0;
88 }
89
91 "mjpegadump",
92 0,
94 };