Directory: | ../../../ffmpeg/ |
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File: | src/libavcodec/mjpegbdec.c |
Date: | 2022-07-05 19:52:29 |
Exec | Total | Coverage | |
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Lines: | 67 | 81 | 82.7% |
Branches: | 19 | 40 | 47.5% |
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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 "codec_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, AVFrame *rframe, | |
44 | int *got_frame, AVPacket *avpkt) | ||
45 | { | ||
46 | 11 | const uint8_t *buf = avpkt->data; | |
47 | 11 | int buf_size = avpkt->size; | |
48 | 11 | MJpegDecodeContext *s = avctx->priv_data; | |
49 | const uint8_t *buf_end, *buf_ptr; | ||
50 | GetBitContext hgb; /* for the header */ | ||
51 | uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs; | ||
52 | uint32_t field_size, sod_offs; | ||
53 | int ret; | ||
54 | |||
55 | 11 | buf_ptr = buf; | |
56 | 11 | buf_end = buf + buf_size; | |
57 | 11 | s->got_picture = 0; | |
58 | 11 | s->adobe_transform = -1; | |
59 | 11 | s->buf_size = buf_size; | |
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(rframe, 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 FFCodec ff_mjpegb_decoder = { | ||
160 | .p.name = "mjpegb", | ||
161 | .p.long_name = NULL_IF_CONFIG_SMALL("Apple MJPEG-B"), | ||
162 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
163 | .p.id = AV_CODEC_ID_MJPEGB, | ||
164 | .priv_data_size = sizeof(MJpegDecodeContext), | ||
165 | .init = ff_mjpeg_decode_init, | ||
166 | .close = ff_mjpeg_decode_end, | ||
167 | FF_CODEC_DECODE_CB(mjpegb_decode_frame), | ||
168 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
169 | .p.max_lowres = 3, | ||
170 | .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, | ||
171 | }; | ||
172 |