| /* |
| * 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, |
| }; |