FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/sbc_parser.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 0 51 0.0%
Branches: 0 26 0.0%

Line Branch Exec Source
1 /*
2 * SBC parser
3 *
4 * Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "sbc.h"
24 #include "parser.h"
25
26 typedef struct SBCParseContext {
27 ParseContext pc;
28 uint8_t header[3];
29 int header_size;
30 int buffered_size;
31 } SBCParseContext;
32
33 static int sbc_parse_header(AVCodecParserContext *s, AVCodecContext *avctx,
34 const uint8_t *data, size_t len)
35 {
36 static const int sample_rates[4] = { 16000, 32000, 44100, 48000 };
37 int sr, blocks, mode, subbands, bitpool, channels, joint;
38 int length;
39
40 if (len < 3)
41 return -1;
42
43 if (data[0] == MSBC_SYNCWORD && data[1] == 0 && data[2] == 0) {
44 avctx->channels = 1;
45 avctx->sample_rate = 16000;
46 avctx->frame_size = 120;
47 s->duration = avctx->frame_size;
48 return 57;
49 }
50
51 if (data[0] != SBC_SYNCWORD)
52 return -2;
53
54 sr = (data[1] >> 6) & 0x03;
55 blocks = (((data[1] >> 4) & 0x03) + 1) << 2;
56 mode = (data[1] >> 2) & 0x03;
57 subbands = (((data[1] >> 0) & 0x01) + 1) << 2;
58 bitpool = data[2];
59
60 channels = mode == SBC_MODE_MONO ? 1 : 2;
61 joint = mode == SBC_MODE_JOINT_STEREO;
62
63 length = 4 + (subbands * channels) / 2
64 + ((((mode == SBC_MODE_DUAL_CHANNEL) + 1) * blocks * bitpool
65 + (joint * subbands)) + 7) / 8;
66
67 avctx->channels = channels;
68 avctx->sample_rate = sample_rates[sr];
69 avctx->frame_size = subbands * blocks;
70 s->duration = avctx->frame_size;
71 return length;
72 }
73
74 static int sbc_parse(AVCodecParserContext *s, AVCodecContext *avctx,
75 const uint8_t **poutbuf, int *poutbuf_size,
76 const uint8_t *buf, int buf_size)
77 {
78 SBCParseContext *pc = s->priv_data;
79 int next;
80
81 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
82 next = buf_size;
83 } else {
84 if (pc->header_size) {
85 memcpy(pc->header + pc->header_size, buf,
86 sizeof(pc->header) - pc->header_size);
87 next = sbc_parse_header(s, avctx, pc->header, sizeof(pc->header))
88 - pc->buffered_size;
89 pc->header_size = 0;
90 } else {
91 next = sbc_parse_header(s, avctx, buf, buf_size);
92 if (next >= buf_size)
93 next = -1;
94 }
95
96 if (next < 0) {
97 pc->header_size = FFMIN(sizeof(pc->header), buf_size);
98 memcpy(pc->header, buf, pc->header_size);
99 pc->buffered_size = buf_size;
100 next = END_NOT_FOUND;
101 }
102
103 if (ff_combine_frame(&pc->pc, next, &buf, &buf_size) < 0) {
104 *poutbuf = NULL;
105 *poutbuf_size = 0;
106 return buf_size;
107 }
108 }
109
110 *poutbuf = buf;
111 *poutbuf_size = buf_size;
112 return next;
113 }
114
115 const AVCodecParser ff_sbc_parser = {
116 .codec_ids = { AV_CODEC_ID_SBC },
117 .priv_data_size = sizeof(SBCParseContext),
118 .parser_parse = sbc_parse,
119 .parser_close = ff_parse_close,
120 };
121