2 * HAPQA extract bitstream filter
3 * Copyright (c) 2017 Jokyo Images
5 * This file is part of FFmpeg.
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.
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.
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
24 * HAPQA extract bitstream filter
25 * extract one of the two textures of the HAQA
30 #include "bytestream.h"
33 typedef struct HapqaExtractContext {
35 int texture;/* index of the texture to keep (0 for rgb or 1 for alpha) */
36 } HapqaExtractContext;
38 static int check_texture(HapqaExtractContext *ctx, int section_type) {
39 if (((ctx->texture == 0)&&((section_type & 0x0F) == 0x0F)) || /* HapQ texture and rgb extract */
40 ((ctx->texture == 1)&&((section_type & 0x0F) == 0x01))) /* HapAlphaOnly texture and alpha extract */
42 return 1; /* the texture is the one to keep */
48 static int hapqa_extract(AVBSFContext *bsf, AVPacket *pkt)
50 HapqaExtractContext *ctx = bsf->priv_data;
53 enum HapSectionType section_type;
54 int start_section_size;
55 int target_packet_size = 0;
58 ret = ff_bsf_get_packet_ref(bsf, pkt);
62 bytestream2_init(&gbc, pkt->data, pkt->size);
63 ret = ff_hap_parse_section_header(&gbc, §ion_size, §ion_type);
67 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;
73 start_section_size = 4;
75 bytestream2_seek(&gbc, start_section_size, SEEK_SET);/* go to start of the first texture */
77 ret = ff_hap_parse_section_header(&gbc, §ion_size, §ion_type);
81 target_packet_size = section_size + 4;
83 if (check_texture(ctx, section_type) == 0) { /* the texture is not the one to keep */
84 start_section_size += 4 + section_size;
85 bytestream2_seek(&gbc, start_section_size, SEEK_SET);/* go to start of the second texture */
86 ret = ff_hap_parse_section_header(&gbc, §ion_size, §ion_type);
90 target_packet_size = section_size + 4;
92 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;
99 pkt->data += start_section_size;
100 pkt->size = target_packet_size;
104 av_packet_unref(pkt);
108 static const enum AVCodecID codec_ids[] = {
109 AV_CODEC_ID_HAP, AV_CODEC_ID_NONE,
112 #define OFFSET(x) offsetof(HapqaExtractContext, x)
113 static const AVOption options[] = {
114 { "texture", "texture to keep", OFFSET(texture), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, 0, "texture" },
115 { "color", "keep HapQ texture", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, .unit = "texture" },
116 { "alpha", "keep HapAlphaOnly texture", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, .unit = "texture" },
120 static const AVClass hapqa_extract_class = {
121 .class_name = "hapqa_extract_bsf",
122 .item_name = av_default_item_name,
124 .version = LIBAVUTIL_VERSION_MAJOR,
127 const AVBitStreamFilter ff_hapqa_extract_bsf = {
128 .name = "hapqa_extract",
129 .filter = hapqa_extract,
130 .priv_data_size = sizeof(HapqaExtractContext),
131 .priv_class = &hapqa_extract_class,
132 .codec_ids = codec_ids,