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
32
35 int texture;
/* index of the texture to keep (0 for rgb or 1 for alpha) */
37
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 */
41 {
42 return 1; /* the texture is the one to keep */
43 } else {
44 return 0;
45 }
46 }
47
49 {
52 int section_size;
54 int start_section_size;
55 int target_packet_size = 0;
56 int ret = 0;
57
59 if (ret < 0)
60 return ret;
61
64 if (ret != 0)
66
67 if ((section_type & 0x0F) != 0x0D) {
68 av_log(bsf,
AV_LOG_ERROR,
"Invalid section type for HAPQA %#04x.\n", section_type & 0x0F);
71 }
72
73 start_section_size = 4;
74
75 bytestream2_seek(&gbc, start_section_size, SEEK_SET);
/* go to start of the first texture */
76
78 if (ret != 0)
80
81 target_packet_size = section_size + 4;
82
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 */
87 if (ret != 0)
89
90 target_packet_size = section_size + 4;
91
92 if (
check_texture(ctx, section_type) == 0){
/* the second texture is not the one to keep */
96 }
97 }
98
99 pkt->
data += start_section_size;
100 pkt->
size = target_packet_size;
101
103 if (ret < 0)
105 return ret;
106 }
107
110 };
111
112 #define OFFSET(x) offsetof(HapqaExtractContext, x)
113 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_BSF_PARAM)
119 };
120
126 };
127
129 .
name =
"hapqa_extract",
132 .priv_class = &hapqa_extract_class,
134 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
#define LIBAVUTIL_VERSION_INT
The bitstream filter state.
const char * av_default_item_name(void *ptr)
Return the context name.
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
int ff_hap_parse_section_header(GetByteContext *gbc, int *section_size, enum HapSectionType *section_type)
void * priv_data
Opaque filter-specific private data.
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
AVCodecID
Identify the syntax and semantics of the bitstream.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Libavcodec external API header.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Describe the class of an AVClass context structure.
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
This structure stores compressed data.
int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
Called by bitstream filters to get packet for filtering.