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