135 lines
4.3 KiB
C
Executable File
135 lines
4.3 KiB
C
Executable File
/*
|
|
* HAPQA extract bitstream filter
|
|
* Copyright (c) 2017 Jokyo Images
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* HAPQA extract bitstream filter
|
|
* extract one of the two textures of the HAQA
|
|
*/
|
|
|
|
#include "bsf.h"
|
|
#include "bsf_internal.h"
|
|
#include "bytestream.h"
|
|
#include "hap.h"
|
|
|
|
typedef struct HapqaExtractContext {
|
|
const AVClass *class;
|
|
int texture;/* index of the texture to keep (0 for rgb or 1 for alpha) */
|
|
} HapqaExtractContext;
|
|
|
|
static int check_texture(HapqaExtractContext *ctx, int section_type) {
|
|
if (((ctx->texture == 0)&&((section_type & 0x0F) == 0x0F)) || /* HapQ texture and rgb extract */
|
|
((ctx->texture == 1)&&((section_type & 0x0F) == 0x01))) /* HapAlphaOnly texture and alpha extract */
|
|
{
|
|
return 1; /* the texture is the one to keep */
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int hapqa_extract(AVBSFContext *bsf, AVPacket *pkt)
|
|
{
|
|
HapqaExtractContext *ctx = bsf->priv_data;
|
|
GetByteContext gbc;
|
|
int section_size;
|
|
enum HapSectionType section_type;
|
|
int start_section_size;
|
|
int target_packet_size = 0;
|
|
int ret = 0;
|
|
|
|
ret = ff_bsf_get_packet_ref(bsf, pkt);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
bytestream2_init(&gbc, pkt->data, pkt->size);
|
|
ret = ff_hap_parse_section_header(&gbc, §ion_size, §ion_type);
|
|
if (ret != 0)
|
|
goto fail;
|
|
|
|
if ((section_type & 0x0F) != 0x0D) {
|
|
av_log(bsf, AV_LOG_ERROR, "Invalid section type for HAPQA %#04x.\n", section_type & 0x0F);
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
|
|
start_section_size = 4;
|
|
|
|
bytestream2_seek(&gbc, start_section_size, SEEK_SET);/* go to start of the first texture */
|
|
|
|
ret = ff_hap_parse_section_header(&gbc, §ion_size, §ion_type);
|
|
if (ret != 0)
|
|
goto fail;
|
|
|
|
target_packet_size = section_size + 4;
|
|
|
|
if (check_texture(ctx, section_type) == 0) { /* the texture is not the one to keep */
|
|
start_section_size += 4 + section_size;
|
|
bytestream2_seek(&gbc, start_section_size, SEEK_SET);/* go to start of the second texture */
|
|
ret = ff_hap_parse_section_header(&gbc, §ion_size, §ion_type);
|
|
if (ret != 0)
|
|
goto fail;
|
|
|
|
target_packet_size = section_size + 4;
|
|
|
|
if (check_texture(ctx, section_type) == 0){ /* the second texture is not the one to keep */
|
|
av_log(bsf, AV_LOG_ERROR, "No valid texture found.\n");
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
pkt->data += start_section_size;
|
|
pkt->size = target_packet_size;
|
|
|
|
fail:
|
|
if (ret < 0)
|
|
av_packet_unref(pkt);
|
|
return ret;
|
|
}
|
|
|
|
static const enum AVCodecID codec_ids[] = {
|
|
AV_CODEC_ID_HAP, AV_CODEC_ID_NONE,
|
|
};
|
|
|
|
#define OFFSET(x) offsetof(HapqaExtractContext, x)
|
|
#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_BSF_PARAM)
|
|
static const AVOption options[] = {
|
|
{ "texture", "texture to keep", OFFSET(texture), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS, "texture" },
|
|
{ "color", "keep HapQ texture", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, 0, 0, FLAGS, "texture" },
|
|
{ "alpha", "keep HapAlphaOnly texture", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, FLAGS, "texture" },
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass hapqa_extract_class = {
|
|
.class_name = "hapqa_extract_bsf",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
const AVBitStreamFilter ff_hapqa_extract_bsf = {
|
|
.name = "hapqa_extract",
|
|
.filter = hapqa_extract,
|
|
.priv_data_size = sizeof(HapqaExtractContext),
|
|
.priv_class = &hapqa_extract_class,
|
|
.codec_ids = codec_ids,
|
|
};
|