FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mjpeg2jpeg_bsf.c
Date: 2021-09-24 03:35:22
Exec Total Coverage
Lines: 0 52 0.0%
Branches: 0 18 0.0%

Line Branch Exec Source
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
29 #include "libavutil/error.h"
30 #include "libavutil/intreadwrite.h"
31
32 #include "bsf.h"
33 #include "bsf_internal.h"
34 #include "jpegtables.h"
35 #include "mjpeg.h"
36
37 static const uint8_t jpeg_header[] = {
38 0xff, 0xd8, // SOI
39 0xff, 0xe0, // APP0
40 0x00, 0x10, // APP0 header size (including
41 // this field, but excluding preceding)
42 0x4a, 0x46, 0x49, 0x46, 0x00, // ID string 'JFIF\0'
43 0x01, 0x01, // version
44 0x00, // bits per type
45 0x00, 0x00, // X density
46 0x00, 0x00, // Y density
47 0x00, // X thumbnail size
48 0x00, // Y thumbnail size
49 };
50
51 static const int dht_segment_size = 420;
52 static const uint8_t dht_segment_head[] = { 0xFF, 0xC4, 0x01, 0xA2, 0x00 };
53 static const uint8_t dht_segment_frag[] = {
54 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
55 0x0a, 0x0b, 0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01,
56 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
57 };
58
59 static uint8_t *append(uint8_t *buf, const uint8_t *src, int size)
60 {
61 memcpy(buf, src, size);
62 return buf + size;
63 }
64
65 static uint8_t *append_dht_segment(uint8_t *buf)
66 {
67 buf = append(buf, dht_segment_head, sizeof(dht_segment_head));
68 buf = append(buf, avpriv_mjpeg_bits_dc_luminance + 1, 16);
69 buf = append(buf, dht_segment_frag, sizeof(dht_segment_frag));
70 buf = append(buf, avpriv_mjpeg_val_dc, 12);
71 *(buf++) = 0x10;
72 buf = append(buf, avpriv_mjpeg_bits_ac_luminance + 1, 16);
73 buf = append(buf, avpriv_mjpeg_val_ac_luminance, 162);
74 *(buf++) = 0x11;
75 buf = append(buf, avpriv_mjpeg_bits_ac_chrominance + 1, 16);
76 buf = append(buf, avpriv_mjpeg_val_ac_chrominance, 162);
77 return buf;
78 }
79
80 static int mjpeg2jpeg_filter(AVBSFContext *ctx, AVPacket *out)
81 {
82 AVPacket *in;
83 int ret = 0;
84 int input_skip, output_size;
85 uint8_t *output;
86
87 ret = ff_bsf_get_packet(ctx, &in);
88 if (ret < 0)
89 return ret;
90
91 if (in->size < 12) {
92 av_log(ctx, AV_LOG_ERROR, "input is truncated\n");
93 ret = AVERROR_INVALIDDATA;
94 goto fail;
95 }
96 if (AV_RB16(in->data) != 0xffd8) {
97 av_log(ctx, AV_LOG_ERROR, "input is not MJPEG\n");
98 ret = AVERROR_INVALIDDATA;
99 goto fail;
100 }
101 if (in->data[2] == 0xff && in->data[3] == APP0) {
102 input_skip = (in->data[4] << 8) + in->data[5] + 4;
103 } else {
104 input_skip = 2;
105 }
106 if (in->size < input_skip) {
107 av_log(ctx, AV_LOG_ERROR, "input is truncated\n");
108 ret = AVERROR_INVALIDDATA;
109 goto fail;
110 }
111 output_size = in->size - input_skip +
112 sizeof(jpeg_header) + dht_segment_size;
113 ret = av_new_packet(out, output_size);
114 if (ret < 0)
115 goto fail;
116
117 output = out->data;
118
119 output = append(output, jpeg_header, sizeof(jpeg_header));
120 output = append_dht_segment(output);
121 output = append(output, in->data + input_skip, in->size - input_skip);
122
123 ret = av_packet_copy_props(out, in);
124 if (ret < 0)
125 goto fail;
126
127 fail:
128 if (ret < 0)
129 av_packet_unref(out);
130 av_packet_free(&in);
131 return ret;
132 }
133
134 static const enum AVCodecID codec_ids[] = {
135 AV_CODEC_ID_MJPEG, AV_CODEC_ID_NONE,
136 };
137
138 const AVBitStreamFilter ff_mjpeg2jpeg_bsf = {
139 .name = "mjpeg2jpeg",
140 .filter = mjpeg2jpeg_filter,
141 .codec_ids = codec_ids,
142 };
143