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hap.c
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1 /*
2  * Vidvox Hap utility functions
3  * Copyright (C) 2015 Tom Butterworth <bangnoise@gmail.com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Hap utilities
25  */
26 #include "hap.h"
27 
28 int ff_hap_set_chunk_count(HapContext *ctx, int count, int first_in_frame)
29 {
30  int ret = 0;
31  if (first_in_frame == 1 && ctx->chunk_count != count) {
32  int ret = av_reallocp_array(&ctx->chunks, count, sizeof(HapChunk));
33  if (ret == 0)
34  ret = av_reallocp_array(&ctx->chunk_results, count, sizeof(int));
35  if (ret < 0) {
36  ctx->chunk_count = 0;
37  } else {
38  ctx->chunk_count = count;
39  }
40  } else if (ctx->chunk_count != count) {
41  /* If this is not the first chunk count calculated for a frame and a
42  * different count has already been encountered, then reject the frame:
43  * each table in the Decode Instructions Container must describe the
44  * same number of chunks. */
45  ret = AVERROR_INVALIDDATA;
46  }
47  return ret;
48 }
49 
51 {
52  av_freep(&ctx->tex_buf);
53  av_freep(&ctx->chunks);
54  av_freep(&ctx->chunk_results);
55 }
56 
57 int ff_hap_parse_section_header(GetByteContext *gbc, int *section_size,
58  enum HapSectionType *section_type)
59 {
60  if (bytestream2_get_bytes_left(gbc) < 4)
61  return AVERROR_INVALIDDATA;
62 
63  *section_size = bytestream2_get_le24(gbc);
64  *section_type = bytestream2_get_byte(gbc);
65 
66  if (*section_size == 0) {
67  if (bytestream2_get_bytes_left(gbc) < 4)
68  return AVERROR_INVALIDDATA;
69 
70  *section_size = bytestream2_get_le32(gbc);
71  }
72 
73  if (*section_size > bytestream2_get_bytes_left(gbc) || *section_size < 0)
74  return AVERROR_INVALIDDATA;
75  else
76  return 0;
77 }
Definition: hap.h:61
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
HapChunk * chunks
Definition: hap.h:72
HapSectionType
Definition: hap.h:46
int ff_hap_parse_section_header(GetByteContext *gbc, int *section_size, enum HapSectionType *section_type)
Definition: hap.c:57
#define av_cold
Definition: attributes.h:82
int ff_hap_set_chunk_count(HapContext *ctx, int count, int first_in_frame)
Definition: hap.c:28
int * chunk_results
Definition: hap.h:73
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
GLsizei count
Definition: opengl_enc.c:109
int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
Allocate, reallocate, or free an array through a pointer to a pointer.
Definition: mem.c:205
AVFormatContext * ctx
Definition: movenc.c:48
av_cold void ff_hap_free_context(HapContext *ctx)
Definition: hap.c:50
int chunk_count
Definition: hap.h:71
uint8_t * tex_buf
Definition: hap.h:78
Definition: hap.h:53
#define av_freep(p)