GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/adts_header.c Lines: 28 30 93.3 %
Date: 2019-11-20 04:07:19 Branches: 4 6 66.7 %

Line Branch Exec Source
1
/*
2
 * Audio and Video frame extraction
3
 * Copyright (c) 2003 Fabrice Bellard
4
 * Copyright (c) 2003 Michael Niedermayer
5
 * Copyright (c) 2009 Alex Converse
6
 *
7
 * This file is part of FFmpeg.
8
 *
9
 * FFmpeg is free software; you can redistribute it and/or
10
 * modify it under the terms of the GNU Lesser General Public
11
 * License as published by the Free Software Foundation; either
12
 * version 2.1 of the License, or (at your option) any later version.
13
 *
14
 * FFmpeg is distributed in the hope that it will be useful,
15
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17
 * Lesser General Public License for more details.
18
 *
19
 * You should have received a copy of the GNU Lesser General Public
20
 * License along with FFmpeg; if not, write to the Free Software
21
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22
 */
23
24
#include "aac_ac3_parser.h"
25
#include "adts_header.h"
26
#include "adts_parser.h"
27
#include "get_bits.h"
28
#include "mpeg4audio.h"
29
30
44629
int ff_adts_header_parse(GetBitContext *gbc, AACADTSHeaderInfo *hdr)
31
{
32
    int size, rdb, ch, sr;
33
    int aot, crc_abs;
34
35
44629
    if (get_bits(gbc, 12) != 0xfff)
36
34626
        return AAC_AC3_PARSE_ERROR_SYNC;
37
38
10003
    skip_bits1(gbc);             /* id */
39
10003
    skip_bits(gbc, 2);           /* layer */
40
10003
    crc_abs = get_bits1(gbc);    /* protection_absent */
41
10003
    aot     = get_bits(gbc, 2);  /* profile_objecttype */
42
10003
    sr      = get_bits(gbc, 4);  /* sample_frequency_index */
43
10003
    if (!avpriv_mpeg4audio_sample_rates[sr])
44
        return AAC_AC3_PARSE_ERROR_SAMPLE_RATE;
45
10003
    skip_bits1(gbc);             /* private_bit */
46
10003
    ch = get_bits(gbc, 3);       /* channel_configuration */
47
48
10003
    skip_bits1(gbc);             /* original/copy */
49
10003
    skip_bits1(gbc);             /* home */
50
51
    /* adts_variable_header */
52
10003
    skip_bits1(gbc);             /* copyright_identification_bit */
53
10003
    skip_bits1(gbc);             /* copyright_identification_start */
54
10003
    size = get_bits(gbc, 13);    /* aac_frame_length */
55
10003
    if (size < AV_AAC_ADTS_HEADER_SIZE)
56
        return AAC_AC3_PARSE_ERROR_FRAME_SIZE;
57
58
10003
    skip_bits(gbc, 11);          /* adts_buffer_fullness */
59
10003
    rdb = get_bits(gbc, 2);      /* number_of_raw_data_blocks_in_frame */
60
61
10003
    hdr->object_type    = aot + 1;
62
10003
    hdr->chan_config    = ch;
63
10003
    hdr->crc_absent     = crc_abs;
64
10003
    hdr->num_aac_frames = rdb + 1;
65
10003
    hdr->sampling_index = sr;
66
10003
    hdr->sample_rate    = avpriv_mpeg4audio_sample_rates[sr];
67
10003
    hdr->samples        = (rdb + 1) * 1024;
68
10003
    hdr->bit_rate       = size * 8 * hdr->sample_rate / hdr->samples;
69
70
10003
    return size;
71
}