/* * 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" #include "libavutil/opt.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, &section_size, &section_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, &section_size, &section_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, &section_size, &section_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, .unit = "texture" },        { "color", "keep HapQ texture",         0, AV_OPT_TYPE_CONST, { .i64 = 0 }, 0, 0, FLAGS, .unit = "texture" },        { "alpha", "keep HapAlphaOnly texture", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, FLAGS, .unit = "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 FFBitStreamFilter ff_hapqa_extract_bsf = {    .p.name         = "hapqa_extract",    .p.codec_ids    = codec_ids,    .p.priv_class   = &hapqa_extract_class,    .priv_data_size = sizeof(HapqaExtractContext),    .filter         = hapqa_extract,};