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1 | /* | ||
2 | * Media 100 to MJPEGB bitstream filter | ||
3 | * Copyright (c) 2023 Paul B Mahol | ||
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 | * Media 100 to MJPEGB bitstream filter. | ||
25 | */ | ||
26 | |||
27 | #include "libavutil/intreadwrite.h" | ||
28 | #include "bsf.h" | ||
29 | #include "bsf_internal.h" | ||
30 | #include "bytestream.h" | ||
31 | |||
32 | 4 | static av_cold int init(AVBSFContext *ctx) | |
33 | { | ||
34 | 4 | ctx->par_out->codec_id = AV_CODEC_ID_MJPEGB; | |
35 | 4 | return 0; | |
36 | } | ||
37 | |||
38 | 12 | static int filter(AVBSFContext *ctx, AVPacket *out) | |
39 | { | ||
40 | 12 | unsigned second_field_offset = 0; | |
41 | 12 | unsigned next_field = 0; | |
42 | unsigned dht_offset[2]; | ||
43 | unsigned dqt_offset[2]; | ||
44 | unsigned sod_offset[2]; | ||
45 | unsigned sof_offset[2]; | ||
46 | unsigned sos_offset[2]; | ||
47 | 12 | unsigned field = 0; | |
48 | GetByteContext gb; | ||
49 | PutByteContext pb; | ||
50 | AVPacket *in; | ||
51 | int ret; | ||
52 | |||
53 | 12 | ret = ff_bsf_get_packet(ctx, &in); | |
54 |
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12 | if (ret < 0) |
55 | 8 | return ret; | |
56 | |||
57 | 4 | ret = av_new_packet(out, in->size + 1024); | |
58 |
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4 | if (ret < 0) |
59 | ✗ | goto fail; | |
60 | |||
61 | 4 | bytestream2_init(&gb, in->data, in->size); | |
62 | 4 | bytestream2_init_writer(&pb, out->data, out->size); | |
63 | |||
64 | 8 | second_field: | |
65 | 8 | bytestream2_put_be32(&pb, 0); | |
66 | 8 | bytestream2_put_be32(&pb, AV_RB32("mjpg")); | |
67 | 8 | bytestream2_put_be32(&pb, 0); | |
68 | 8 | bytestream2_put_be32(&pb, 0); | |
69 |
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56 | for (int i = 0; i < 6; i++) |
70 | 48 | bytestream2_put_be32(&pb, 0); | |
71 | |||
72 | 8 | sof_offset[field] = bytestream2_tell_p(&pb); | |
73 | 8 | bytestream2_put_be16(&pb, 17); | |
74 | 8 | bytestream2_put_byte(&pb, 8); | |
75 | 8 | bytestream2_put_be16(&pb, ctx->par_in->height / 2); | |
76 | 8 | bytestream2_put_be16(&pb, ctx->par_in->width); | |
77 | 8 | bytestream2_put_byte(&pb, 3); | |
78 | 8 | bytestream2_put_byte(&pb, 1); | |
79 | 8 | bytestream2_put_byte(&pb, 0x21); | |
80 | 8 | bytestream2_put_byte(&pb, 0); | |
81 | 8 | bytestream2_put_byte(&pb, 2); | |
82 | 8 | bytestream2_put_byte(&pb, 0x11); | |
83 | 8 | bytestream2_put_byte(&pb, 1); | |
84 | 8 | bytestream2_put_byte(&pb, 3); | |
85 | 8 | bytestream2_put_byte(&pb, 0x11); | |
86 | 8 | bytestream2_put_byte(&pb, 1); | |
87 | |||
88 | 8 | sos_offset[field] = bytestream2_tell_p(&pb); | |
89 | 8 | bytestream2_put_be16(&pb, 12); | |
90 | 8 | bytestream2_put_byte(&pb, 3); | |
91 | 8 | bytestream2_put_byte(&pb, 1); | |
92 | 8 | bytestream2_put_byte(&pb, 0); | |
93 | 8 | bytestream2_put_byte(&pb, 2); | |
94 | 8 | bytestream2_put_byte(&pb, 0x11); | |
95 | 8 | bytestream2_put_byte(&pb, 3); | |
96 | 8 | bytestream2_put_byte(&pb, 0x11); | |
97 | 8 | bytestream2_put_byte(&pb, 0); | |
98 | 8 | bytestream2_put_byte(&pb, 0); | |
99 | 8 | bytestream2_put_byte(&pb, 0); | |
100 | |||
101 | 8 | dqt_offset[field] = bytestream2_tell_p(&pb); | |
102 | 8 | bytestream2_put_be16(&pb, 132); | |
103 | 8 | bytestream2_put_byte(&pb, 0); | |
104 | 8 | bytestream2_skip(&gb, 4); | |
105 |
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520 | for (int i = 0; i < 64; i++) |
106 | 512 | bytestream2_put_byte(&pb, bytestream2_get_be32(&gb)); | |
107 | 8 | bytestream2_put_byte(&pb, 1); | |
108 |
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520 | for (int i = 0; i < 64; i++) |
109 | 512 | bytestream2_put_byte(&pb, bytestream2_get_be32(&gb)); | |
110 | |||
111 | 8 | dht_offset[field] = 0; | |
112 | 8 | sod_offset[field] = bytestream2_tell_p(&pb); | |
113 | |||
114 |
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136984 | for (int i = bytestream2_tell(&gb) + 8; next_field == 0 && i < in->size - 4; i++) { |
115 |
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136980 | if (AV_RB32(in->data + i) == 0x00000001) { |
116 | 4 | next_field = i; | |
117 | 4 | break; | |
118 | } | ||
119 | } | ||
120 | |||
121 | 8 | bytestream2_skip(&gb, 8); | |
122 | 8 | bytestream2_copy_buffer(&pb, &gb, next_field - bytestream2_tell(&gb)); | |
123 | 8 | bytestream2_put_be64(&pb, 0); | |
124 | |||
125 |
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8 | if (field == 0) { |
126 | 4 | field = 1; | |
127 | 4 | second_field_offset = bytestream2_tell_p(&pb); | |
128 | 4 | next_field = in->size; | |
129 | 4 | goto second_field; | |
130 | } | ||
131 | |||
132 | 4 | AV_WB32(out->data + 8, second_field_offset); | |
133 | 4 | AV_WB32(out->data + 12, second_field_offset); | |
134 | 4 | AV_WB32(out->data + 16, second_field_offset); | |
135 | 4 | AV_WB32(out->data + 20, dqt_offset[0]); | |
136 | 4 | AV_WB32(out->data + 24, dht_offset[0]); | |
137 | 4 | AV_WB32(out->data + 28, sof_offset[0]); | |
138 | 4 | AV_WB32(out->data + 32, sos_offset[0]); | |
139 | 4 | AV_WB32(out->data + 36, sod_offset[0]); | |
140 | |||
141 | 4 | AV_WB32(out->data + second_field_offset + 8, bytestream2_tell_p(&pb) - second_field_offset); | |
142 | 4 | AV_WB32(out->data + second_field_offset + 12, bytestream2_tell_p(&pb) - second_field_offset); | |
143 | 4 | AV_WB32(out->data + second_field_offset + 16, 0); | |
144 | 4 | AV_WB32(out->data + second_field_offset + 20, dqt_offset[1] - second_field_offset); | |
145 | 4 | AV_WB32(out->data + second_field_offset + 24, dht_offset[1]); | |
146 | 4 | AV_WB32(out->data + second_field_offset + 28, sof_offset[1] - second_field_offset); | |
147 | 4 | AV_WB32(out->data + second_field_offset + 32, sos_offset[1] - second_field_offset); | |
148 | 4 | AV_WB32(out->data + second_field_offset + 36, sod_offset[1] - second_field_offset); | |
149 | |||
150 | 4 | out->size = bytestream2_tell_p(&pb); | |
151 | 4 | memset(out->data + out->size, 0, AV_INPUT_BUFFER_PADDING_SIZE); | |
152 | |||
153 | 4 | ret = av_packet_copy_props(out, in); | |
154 |
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4 | if (ret < 0) |
155 | ✗ | goto fail; | |
156 | |||
157 | 4 | fail: | |
158 |
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4 | if (ret < 0) |
159 | ✗ | av_packet_unref(out); | |
160 | 4 | av_packet_free(&in); | |
161 | 4 | return ret; | |
162 | } | ||
163 | |||
164 | const FFBitStreamFilter ff_media100_to_mjpegb_bsf = { | ||
165 | .p.name = "media100_to_mjpegb", | ||
166 | .p.codec_ids = (const enum AVCodecID []){ AV_CODEC_ID_MEDIA100, AV_CODEC_ID_NONE }, | ||
167 | .init = init, | ||
168 | .filter = filter, | ||
169 | }; | ||
170 |