Add ff_ prefix to data symbols of encoders, decoders, hwaccel, parsers, bsf.
[libav.git] / libavcodec / mjpeg2jpeg_bsf.c
1 /*
2 * MJPEG/AVI1 to JPEG/JFIF bitstream format filter
3 * Copyright (c) 2010 Adrian Daerr and Nicolas George
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 * Adapted from mjpeg2jpeg.c, with original copyright:
24 * Paris 2010 Adrian Daerr, public domain
25 */
26
27 #include <string.h>
28 #include "avcodec.h"
29 #include "mjpeg.h"
30
31 static const uint8_t jpeg_header[] = {
32 0xff, 0xd8, // SOI
33 0xff, 0xe0, // APP0
34 0x00, 0x10, // APP0 header size (including
35 // this field, but excluding preceding)
36 0x4a, 0x46, 0x49, 0x46, 0x00, // ID string 'JFIF\0'
37 0x01, 0x01, // version
38 0x00, // bits per type
39 0x00, 0x00, // X density
40 0x00, 0x00, // Y density
41 0x00, // X thumbnail size
42 0x00, // Y thumbnail size
43 };
44
45 static const int dht_segment_size = 420;
46 static const uint8_t dht_segment_head[] = { 0xFF, 0xC4, 0x01, 0xA2, 0x00 };
47 static const uint8_t dht_segment_frag[] = {
48 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
49 0x0a, 0x0b, 0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01,
50 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
51 };
52
53 static uint8_t *append(uint8_t *buf, const uint8_t *src, int size)
54 {
55 memcpy(buf, src, size);
56 return buf + size;
57 }
58
59 static uint8_t *append_dht_segment(uint8_t *buf)
60 {
61 buf = append(buf, dht_segment_head, sizeof(dht_segment_head));
62 buf = append(buf, ff_mjpeg_bits_dc_luminance + 1, 16);
63 buf = append(buf, dht_segment_frag, sizeof(dht_segment_frag));
64 buf = append(buf, ff_mjpeg_val_dc, 12);
65 *(buf++) = 0x10;
66 buf = append(buf, ff_mjpeg_bits_ac_luminance + 1, 16);
67 buf = append(buf, ff_mjpeg_val_ac_luminance, 162);
68 *(buf++) = 0x11;
69 buf = append(buf, ff_mjpeg_bits_ac_chrominance + 1, 16);
70 buf = append(buf, ff_mjpeg_val_ac_chrominance, 162);
71 return buf;
72 }
73
74 static int mjpeg2jpeg_filter(AVBitStreamFilterContext *bsfc,
75 AVCodecContext *avctx, const char *args,
76 uint8_t **poutbuf, int *poutbuf_size,
77 const uint8_t *buf, int buf_size,
78 int keyframe)
79 {
80 int input_skip, output_size;
81 uint8_t *output, *out;
82
83 if (buf_size < 12) {
84 av_log(avctx, AV_LOG_ERROR, "input is truncated\n");
85 return AVERROR_INVALIDDATA;
86 }
87 if (memcmp("AVI1", buf + 6, 4)) {
88 av_log(avctx, AV_LOG_ERROR, "input is not MJPEG/AVI1\n");
89 return AVERROR_INVALIDDATA;
90 }
91 input_skip = (buf[4] << 8) + buf[5] + 4;
92 if (buf_size < input_skip) {
93 av_log(avctx, AV_LOG_ERROR, "input is truncated\n");
94 return AVERROR_INVALIDDATA;
95 }
96 output_size = buf_size - input_skip +
97 sizeof(jpeg_header) + dht_segment_size;
98 output = out = av_malloc(output_size);
99 if (!output)
100 return AVERROR(ENOMEM);
101 out = append(out, jpeg_header, sizeof(jpeg_header));
102 out = append_dht_segment(out);
103 out = append(out, buf + input_skip, buf_size - input_skip);
104 *poutbuf = output;
105 *poutbuf_size = output_size;
106 return 1;
107 }
108
109 AVBitStreamFilter ff_mjpeg2jpeg_bsf = {
110 .name = "mjpeg2jpeg",
111 .priv_data_size = 0,
112 .filter = mjpeg2jpeg_filter,
113 };