build: Split JPEG-related tables off into a separate component
[libav.git] / libavcodec / mjpeg2jpeg_bsf.c
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1/*
2 * MJPEG/AVI1 to JPEG/JFIF bitstream format filter
3 * Copyright (c) 2010 Adrian Daerr and Nicolas George
4 *
2912e87a 5 * This file is part of Libav.
ba83c4bf 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/*
23 * Adapted from mjpeg2jpeg.c, with original copyright:
24 * Paris 2010 Adrian Daerr, public domain
25 */
26
27#include <string.h>
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28
29#include "libavutil/error.h"
30#include "libavutil/mem.h"
31
ba83c4bf 32#include "avcodec.h"
4978850c 33#include "jpegtables.h"
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34
35static const uint8_t jpeg_header[] = {
36 0xff, 0xd8, // SOI
37 0xff, 0xe0, // APP0
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
47};
48
49static const int dht_segment_size = 420;
50static const uint8_t dht_segment_head[] = { 0xFF, 0xC4, 0x01, 0xA2, 0x00 };
51static 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,
55};
56
57static uint8_t *append(uint8_t *buf, const uint8_t *src, int size)
58{
59 memcpy(buf, src, size);
60 return buf + size;
61}
62
63static uint8_t *append_dht_segment(uint8_t *buf)
64{
65 buf = append(buf, dht_segment_head, sizeof(dht_segment_head));
a0845bae 66 buf = append(buf, avpriv_mjpeg_bits_dc_luminance + 1, 16);
ba83c4bf 67 buf = append(buf, dht_segment_frag, sizeof(dht_segment_frag));
a0845bae 68 buf = append(buf, avpriv_mjpeg_val_dc, 12);
ba83c4bf 69 *(buf++) = 0x10;
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70 buf = append(buf, avpriv_mjpeg_bits_ac_luminance + 1, 16);
71 buf = append(buf, avpriv_mjpeg_val_ac_luminance, 162);
ba83c4bf 72 *(buf++) = 0x11;
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73 buf = append(buf, avpriv_mjpeg_bits_ac_chrominance + 1, 16);
74 buf = append(buf, avpriv_mjpeg_val_ac_chrominance, 162);
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75 return buf;
76}
77
78static 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,
82 int keyframe)
83{
84 int input_skip, output_size;
85 uint8_t *output, *out;
86
87 if (buf_size < 12) {
88 av_log(avctx, AV_LOG_ERROR, "input is truncated\n");
89 return AVERROR_INVALIDDATA;
90 }
91 if (memcmp("AVI1", buf + 6, 4)) {
92 av_log(avctx, AV_LOG_ERROR, "input is not MJPEG/AVI1\n");
93 return AVERROR_INVALIDDATA;
94 }
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;
99 }
100 output_size = buf_size - input_skip +
101 sizeof(jpeg_header) + dht_segment_size;
102 output = out = av_malloc(output_size);
103 if (!output)
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);
108 *poutbuf = output;
109 *poutbuf_size = output_size;
110 return 1;
111}
112
d36beb3f 113AVBitStreamFilter ff_mjpeg2jpeg_bsf = {
ba83c4bf 114 .name = "mjpeg2jpeg",
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115 .filter = mjpeg2jpeg_filter,
116};