78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
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/*
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* Vidvox Hap utility functions
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* Copyright (C) 2015 Tom Butterworth <bangnoise@gmail.com>
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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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* Hap utilities
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*/
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#include "hap.h"
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int ff_hap_set_chunk_count(HapContext *ctx, int count, int first_in_frame)
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{
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int ret = 0;
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if (first_in_frame == 1 && ctx->chunk_count != count) {
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int ret = av_reallocp_array(&ctx->chunks, count, sizeof(HapChunk));
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if (ret == 0)
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ret = av_reallocp_array(&ctx->chunk_results, count, sizeof(int));
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if (ret < 0) {
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ctx->chunk_count = 0;
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} else {
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ctx->chunk_count = count;
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}
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} else if (ctx->chunk_count != count) {
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/* If this is not the first chunk count calculated for a frame and a
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* different count has already been encountered, then reject the frame:
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* each table in the Decode Instructions Container must describe the
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* same number of chunks. */
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ret = AVERROR_INVALIDDATA;
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}
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return ret;
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}
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av_cold void ff_hap_free_context(HapContext *ctx)
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{
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av_freep(&ctx->tex_buf);
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av_freep(&ctx->chunks);
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av_freep(&ctx->chunk_results);
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}
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int ff_hap_parse_section_header(GetByteContext *gbc, int *section_size,
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enum HapSectionType *section_type)
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{
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if (bytestream2_get_bytes_left(gbc) < 4)
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return AVERROR_INVALIDDATA;
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*section_size = bytestream2_get_le24(gbc);
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*section_type = bytestream2_get_byte(gbc);
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if (*section_size == 0) {
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if (bytestream2_get_bytes_left(gbc) < 4)
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return AVERROR_INVALIDDATA;
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*section_size = bytestream2_get_le32(gbc);
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}
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if (*section_size > bytestream2_get_bytes_left(gbc) || *section_size < 0)
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return AVERROR_INVALIDDATA;
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else
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return 0;
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}
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