FFmpeg
libavcodec
hap.c
Go to the documentation of this file.
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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 "
libavutil/mem.h
"
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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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}
GetByteContext
Definition:
bytestream.h:33
ff_hap_parse_section_header
int ff_hap_parse_section_header(GetByteContext *gbc, int *section_size, enum HapSectionType *section_type)
Definition:
hap.c:58
HapContext
Definition:
hap.h:60
hap.h
av_cold
#define av_cold
Definition:
attributes.h:90
ff_hap_free_context
av_cold void ff_hap_free_context(HapContext *ctx)
Definition:
hap.c:51
ctx
AVFormatContext * ctx
Definition:
movenc.c:49
ff_hap_set_chunk_count
int ff_hap_set_chunk_count(HapContext *ctx, int count, int first_in_frame)
Definition:
hap.c:29
bytestream2_get_bytes_left
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition:
bytestream.h:158
HapSectionType
HapSectionType
Definition:
hap.h:45
av_reallocp_array
int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
Allocate, reallocate an array through a pointer to a pointer.
Definition:
mem.c:225
HapChunk
Definition:
hap.h:52
ret
ret
Definition:
filter_design.txt:187
mem.h
av_freep
#define av_freep(p)
Definition:
tableprint_vlc.h:34
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition:
error.h:61
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