FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mjpegbdec.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 66 80 82.5%
Branches: 19 40 47.5%

Line Branch Exec Source
1 /*
2 * Apple MJPEG-B decoder
3 * Copyright (c) 2002 Alex Beregszaszi
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 * Apple MJPEG-B decoder.
25 */
26
27 #include <inttypes.h>
28
29 #include "avcodec.h"
30 #include "internal.h"
31 #include "mjpeg.h"
32 #include "mjpegdec.h"
33
34 132 static uint32_t read_offs(AVCodecContext *avctx, GetBitContext *gb, uint32_t size, const char *err_msg){
35 132 uint32_t offs= get_bits_long(gb, 32);
36
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132 if(offs >= size){
37 av_log(avctx, AV_LOG_WARNING, err_msg, offs, size);
38 return 0;
39 }
40 132 return offs;
41 }
42
43 11 static int mjpegb_decode_frame(AVCodecContext *avctx,
44 void *data, int *got_frame,
45 AVPacket *avpkt)
46 {
47 11 const uint8_t *buf = avpkt->data;
48 11 int buf_size = avpkt->size;
49 11 MJpegDecodeContext *s = avctx->priv_data;
50 const uint8_t *buf_end, *buf_ptr;
51 GetBitContext hgb; /* for the header */
52 uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;
53 uint32_t field_size, sod_offs;
54 int ret;
55
56 11 buf_ptr = buf;
57 11 buf_end = buf + buf_size;
58 11 s->got_picture = 0;
59 11 s->adobe_transform = -1;
60
61 22 read_header:
62 /* reset on every SOI */
63 22 s->restart_interval = 0;
64 22 s->restart_count = 0;
65 22 s->mjpb_skiptosod = 0;
66
67
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22 if (buf_end - buf_ptr >= 1 << 28)
68 return AVERROR_INVALIDDATA;
69
70 22 init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);
71
72 22 skip_bits(&hgb, 32); /* reserved zeros */
73
74
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22 if (get_bits_long(&hgb, 32) != MKBETAG('m','j','p','g')) {
75 av_log(avctx, AV_LOG_WARNING, "not mjpeg-b (bad fourcc)\n");
76 return AVERROR_INVALIDDATA;
77 }
78
79 22 field_size = get_bits_long(&hgb, 32); /* field size */
80 22 av_log(avctx, AV_LOG_DEBUG, "field size: 0x%"PRIx32"\n", field_size);
81 22 skip_bits(&hgb, 32); /* padded field size */
82 22 second_field_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "second_field_offs is %d and size is %d\n");
83 22 av_log(avctx, AV_LOG_DEBUG, "second field offs: 0x%"PRIx32"\n",
84 second_field_offs);
85
86 22 dqt_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "dqt is %d and size is %d\n");
87 22 av_log(avctx, AV_LOG_DEBUG, "dqt offs: 0x%"PRIx32"\n", dqt_offs);
88
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22 if (dqt_offs) {
89 22 init_get_bits(&s->gb, buf_ptr+dqt_offs, (buf_end - (buf_ptr+dqt_offs))*8);
90 22 s->start_code = DQT;
91 22 ret = ff_mjpeg_decode_dqt(s);
92
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22 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
93 return ret;
94 }
95
96 22 dht_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "dht is %d and size is %d\n");
97 22 av_log(avctx, AV_LOG_DEBUG, "dht offs: 0x%"PRIx32"\n", dht_offs);
98
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22 if (dht_offs) {
99 22 init_get_bits(&s->gb, buf_ptr+dht_offs, (buf_end - (buf_ptr+dht_offs))*8);
100 22 s->start_code = DHT;
101 22 ff_mjpeg_decode_dht(s);
102 }
103
104 22 sof_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "sof is %d and size is %d\n");
105 22 av_log(avctx, AV_LOG_DEBUG, "sof offs: 0x%"PRIx32"\n", sof_offs);
106
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22 if (sof_offs) {
107 22 init_get_bits(&s->gb, buf_ptr+sof_offs, (buf_end - (buf_ptr+sof_offs))*8);
108 22 s->start_code = SOF0;
109
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22 if ((ret = ff_mjpeg_decode_sof(s)) < 0)
110 return ret;
111 }
112
113 22 sos_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "sos is %d and size is %d\n");
114 22 av_log(avctx, AV_LOG_DEBUG, "sos offs: 0x%"PRIx32"\n", sos_offs);
115 22 sod_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "sof is %d and size is %d\n");
116 22 av_log(avctx, AV_LOG_DEBUG, "sod offs: 0x%"PRIx32"\n", sod_offs);
117
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22 if (sos_offs) {
118 22 init_get_bits(&s->gb, buf_ptr + sos_offs,
119 22 8 * FFMIN(field_size, buf_end - buf_ptr - sos_offs));
120 22 s->mjpb_skiptosod = (sod_offs - sos_offs - show_bits(&s->gb, 16));
121 22 s->start_code = SOS;
122
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22 if (avctx->skip_frame == AVDISCARD_ALL) {
123 skip_bits(&s->gb, get_bits_left(&s->gb));
124 } else {
125 22 ret = ff_mjpeg_decode_sos(s, NULL, 0, NULL);
126
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22 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
127 return ret;
128 }
129 }
130
131
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22 if (s->interlaced) {
132 22 s->bottom_field ^= 1;
133 /* if not bottom field, do not output image yet */
134
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22 if (s->bottom_field != s->interlace_polarity && second_field_offs) {
135 11 buf_ptr = buf + second_field_offs;
136 11 goto read_header;
137 }
138 }
139
140 //XXX FIXME factorize, this looks very similar to the EOI code
141
142
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11 if(!s->got_picture) {
143 av_log(avctx, AV_LOG_WARNING, "no picture\n");
144 return buf_size;
145 }
146
147
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11 if ((ret = av_frame_ref(data, s->picture_ptr)) < 0)
148 return ret;
149 11 *got_frame = 1;
150
151
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11 if (!s->lossless && avctx->debug & FF_DEBUG_QP) {
152 av_log(avctx, AV_LOG_DEBUG, "QP: %d\n",
153 FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]));
154 }
155
156 11 return buf_size;
157 }
158
159 const AVCodec ff_mjpegb_decoder = {
160 .name = "mjpegb",
161 .long_name = NULL_IF_CONFIG_SMALL("Apple MJPEG-B"),
162 .type = AVMEDIA_TYPE_VIDEO,
163 .id = AV_CODEC_ID_MJPEGB,
164 .priv_data_size = sizeof(MJpegDecodeContext),
165 .init = ff_mjpeg_decode_init,
166 .close = ff_mjpeg_decode_end,
167 .decode = mjpegb_decode_frame,
168 .capabilities = AV_CODEC_CAP_DR1,
169 .max_lowres = 3,
170 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
171 };
172