aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* Vidvox Hap utility functions
* Copyright (C) 2015 Tom Butterworth <bangnoise@gmail.com>
*
* 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
* Hap utilities
*/
#include "hap.h"
int ff_hap_set_chunk_count(HapContext *ctx, int count, int first_in_frame)
{
int ret = 0;
if (first_in_frame == 1 && ctx->chunk_count != count) {
int ret = av_reallocp_array(&ctx->chunks, count, sizeof(HapChunk));
if (ret == 0)
ret = av_reallocp_array(&ctx->chunk_results, count, sizeof(int));
if (ret < 0) {
ctx->chunk_count = 0;
} else {
ctx->chunk_count = count;
}
} else if (ctx->chunk_count != count) {
/* If this is not the first chunk count calculated for a frame and a
* different count has already been encountered, then reject the frame:
* each table in the Decode Instructions Container must describe the
* same number of chunks. */
ret = AVERROR_INVALIDDATA;
}
return ret;
}
av_cold void ff_hap_free_context(HapContext *ctx)
{
av_freep(&ctx->tex_buf);
av_freep(&ctx->chunks);
av_freep(&ctx->chunk_results);
}
int ff_hap_parse_section_header(GetByteContext *gbc, int *section_size,
enum HapSectionType *section_type)
{
if (bytestream2_get_bytes_left(gbc) < 4)
return AVERROR_INVALIDDATA;
*section_size = bytestream2_get_le24(gbc);
*section_type = bytestream2_get_byte(gbc);
if (*section_size == 0) {
if (bytestream2_get_bytes_left(gbc) < 4)
return AVERROR_INVALIDDATA;
*section_size = bytestream2_get_le32(gbc);
}
if (*section_size > bytestream2_get_bytes_left(gbc) || *section_size < 0)
return AVERROR_INVALIDDATA;
else
return 0;
}
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