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1 | /* | ||
2 | * HAPQA extract bitstream filter | ||
3 | * Copyright (c) 2017 Jokyo Images | ||
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 | * HAPQA extract bitstream filter | ||
25 | * extract one of the two textures of the HAQA | ||
26 | */ | ||
27 | |||
28 | #include "bsf.h" | ||
29 | #include "bsf_internal.h" | ||
30 | #include "bytestream.h" | ||
31 | #include "hap.h" | ||
32 | |||
33 | typedef struct HapqaExtractContext { | ||
34 | const AVClass *class; | ||
35 | int texture;/* index of the texture to keep (0 for rgb or 1 for alpha) */ | ||
36 | } HapqaExtractContext; | ||
37 | |||
38 | 9 | static int check_texture(HapqaExtractContext *ctx, int section_type) { | |
39 |
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9 | if (((ctx->texture == 0)&&((section_type & 0x0F) == 0x0F)) || /* HapQ texture and rgb extract */ |
40 |
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6 | ((ctx->texture == 1)&&((section_type & 0x0F) == 0x01))) /* HapAlphaOnly texture and alpha extract */ |
41 | { | ||
42 | 6 | return 1; /* the texture is the one to keep */ | |
43 | } else { | ||
44 | 3 | return 0; | |
45 | } | ||
46 | } | ||
47 | |||
48 | 24 | static int hapqa_extract(AVBSFContext *bsf, AVPacket *pkt) | |
49 | { | ||
50 | 24 | HapqaExtractContext *ctx = bsf->priv_data; | |
51 | GetByteContext gbc; | ||
52 | int section_size; | ||
53 | enum HapSectionType section_type; | ||
54 | int start_section_size; | ||
55 | 24 | int target_packet_size = 0; | |
56 | 24 | int ret = 0; | |
57 | |||
58 | 24 | ret = ff_bsf_get_packet_ref(bsf, pkt); | |
59 |
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24 | if (ret < 0) |
60 | 18 | return ret; | |
61 | |||
62 | 6 | bytestream2_init(&gbc, pkt->data, pkt->size); | |
63 | 6 | ret = ff_hap_parse_section_header(&gbc, §ion_size, §ion_type); | |
64 |
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6 | if (ret != 0) |
65 | ✗ | goto fail; | |
66 | |||
67 |
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6 | if ((section_type & 0x0F) != 0x0D) { |
68 | ✗ | av_log(bsf, AV_LOG_ERROR, "Invalid section type for HAPQA %#04x.\n", section_type & 0x0F); | |
69 | ✗ | ret = AVERROR_INVALIDDATA; | |
70 | ✗ | goto fail; | |
71 | } | ||
72 | |||
73 | 6 | start_section_size = 4; | |
74 | |||
75 | 6 | bytestream2_seek(&gbc, start_section_size, SEEK_SET);/* go to start of the first texture */ | |
76 | |||
77 | 6 | ret = ff_hap_parse_section_header(&gbc, §ion_size, §ion_type); | |
78 |
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6 | if (ret != 0) |
79 | ✗ | goto fail; | |
80 | |||
81 | 6 | target_packet_size = section_size + 4; | |
82 | |||
83 |
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6 | if (check_texture(ctx, section_type) == 0) { /* the texture is not the one to keep */ |
84 | 3 | start_section_size += 4 + section_size; | |
85 | 3 | bytestream2_seek(&gbc, start_section_size, SEEK_SET);/* go to start of the second texture */ | |
86 | 3 | ret = ff_hap_parse_section_header(&gbc, §ion_size, §ion_type); | |
87 |
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3 | if (ret != 0) |
88 | ✗ | goto fail; | |
89 | |||
90 | 3 | target_packet_size = section_size + 4; | |
91 | |||
92 |
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3 | if (check_texture(ctx, section_type) == 0){ /* the second texture is not the one to keep */ |
93 | ✗ | av_log(bsf, AV_LOG_ERROR, "No valid texture found.\n"); | |
94 | ✗ | ret = AVERROR_INVALIDDATA; | |
95 | ✗ | goto fail; | |
96 | } | ||
97 | } | ||
98 | |||
99 | 6 | pkt->data += start_section_size; | |
100 | 6 | pkt->size = target_packet_size; | |
101 | |||
102 | 6 | fail: | |
103 |
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6 | if (ret < 0) |
104 | ✗ | av_packet_unref(pkt); | |
105 | 6 | return ret; | |
106 | } | ||
107 | |||
108 | static const enum AVCodecID codec_ids[] = { | ||
109 | AV_CODEC_ID_HAP, AV_CODEC_ID_NONE, | ||
110 | }; | ||
111 | |||
112 | #define OFFSET(x) offsetof(HapqaExtractContext, x) | ||
113 | #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_BSF_PARAM) | ||
114 | static const AVOption options[] = { | ||
115 | { "texture", "texture to keep", OFFSET(texture), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS, "texture" }, | ||
116 | { "color", "keep HapQ texture", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, 0, 0, FLAGS, "texture" }, | ||
117 | { "alpha", "keep HapAlphaOnly texture", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, FLAGS, "texture" }, | ||
118 | { NULL }, | ||
119 | }; | ||
120 | |||
121 | static const AVClass hapqa_extract_class = { | ||
122 | .class_name = "hapqa_extract_bsf", | ||
123 | .item_name = av_default_item_name, | ||
124 | .option = options, | ||
125 | .version = LIBAVUTIL_VERSION_INT, | ||
126 | }; | ||
127 | |||
128 | const FFBitStreamFilter ff_hapqa_extract_bsf = { | ||
129 | .p.name = "hapqa_extract", | ||
130 | .p.codec_ids = codec_ids, | ||
131 | .p.priv_class = &hapqa_extract_class, | ||
132 | .priv_data_size = sizeof(HapqaExtractContext), | ||
133 | .filter = hapqa_extract, | ||
134 | }; | ||
135 |