FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/bit.c
Date: 2026-04-24 19:58:39
Exec Total Coverage
Lines: 5 68 7.4%
Functions: 1 5 20.0%
Branches: 2 42 4.8%
Line Branch Exec Source
1 /*
2 * G.729 bit format muxer and demuxer
3 * Copyright (c) 2007-2008 Vladimir Voroshilov
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 #include "config_components.h"
23
24 #include "avformat.h"
25 #include "avio_internal.h"
26 #include "demux.h"
27 #include "internal.h"
28 #include "mux.h"
29 #include "libavcodec/get_bits.h"
30 #include "libavcodec/put_bits.h"
31
32 #define MAX_FRAME_SIZE 10
33
34 #define SYNC_WORD 0x6b21
35 #define BIT_0 0x7f
36 #define BIT_1 0x81
37
38 #if CONFIG_BIT_DEMUXER
39 7480 static int probe(const AVProbeData *p)
40 {
41 7480 int i = 0, j, valid = 0;
42
43
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 7480 while (2 * i + 3 < p->buf_size){
44
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 7480 if (AV_RL16(&p->buf[2 * i++]) != SYNC_WORD)
45 7480 return 0;
46 ✗ j = AV_RL16(&p->buf[2 * i++]);
47 ✗ if (j != 0 && j != 0x10 && j != 0x40 && j != 0x50 && j != 0x76)
48 ✗ return 0;
49 ✗ if (j)
50 ✗ valid++;
51 ✗ i += j;
52 }
53 ✗ if (valid > 10)
54 ✗ return AVPROBE_SCORE_MAX;
55 ✗ if (valid > 2)
56 ✗ return AVPROBE_SCORE_EXTENSION - 1;
57 ✗ return 0;
58 }
59
60 ✗ static int read_header(AVFormatContext *s)
61 {
62 AVStream* st;
63
64 ✗ st=avformat_new_stream(s, NULL);
65 ✗ if (!st)
66 ✗ return AVERROR(ENOMEM);
67
68 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
69 ✗ st->codecpar->codec_id=AV_CODEC_ID_G729;
70 ✗ st->codecpar->sample_rate=8000;
71 ✗ st->codecpar->block_align = 16;
72 ✗ st->codecpar->ch_layout.nb_channels = 1;
73
74 ✗ avpriv_set_pts_info(st, 64, 1, 100);
75 ✗ return 0;
76 }
77
78 ✗ static int read_packet(AVFormatContext *s,
79 AVPacket *pkt)
80 {
81 ✗ AVIOContext *pb = s->pb;
82 PutBitContext pbo;
83 uint16_t buf[8 * MAX_FRAME_SIZE + 2];
84 int packet_size;
85 ✗ uint16_t* src=buf;
86 int i, j, ret;
87 ✗ int64_t pos= avio_tell(pb);
88
89 ✗ if(avio_feof(pb))
90 ✗ return AVERROR_EOF;
91
92 ✗ avio_rl16(pb); // sync word
93 ✗ packet_size = avio_rl16(pb) / 8;
94 ✗ if(packet_size > MAX_FRAME_SIZE)
95 ✗ return AVERROR_INVALIDDATA;
96
97 ✗ ret = ffio_read_size(pb, (uint8_t*)buf, (8 * packet_size) * sizeof(uint16_t));
98 ✗ if(ret<0)
99 ✗ return ret;
100
101 ✗ if ((ret = av_new_packet(pkt, packet_size)) < 0)
102 ✗ return ret;
103
104 ✗ init_put_bits(&pbo, pkt->data, packet_size);
105 ✗ for(j=0; j < packet_size; j++)
106 ✗ for(i=0; i<8;i++)
107 ✗ put_bits(&pbo,1, AV_RL16(src++) == BIT_1 ? 1 : 0);
108
109 ✗ flush_put_bits(&pbo);
110
111 ✗ pkt->duration=1;
112 ✗ pkt->pos = pos;
113 ✗ return 0;
114 }
115
116 const FFInputFormat ff_bit_demuxer = {
117 .p.name = "bit",
118 .p.long_name = NULL_IF_CONFIG_SMALL("G.729 BIT file format"),
119 .p.extensions = "bit",
120 .read_probe = probe,
121 .read_header = read_header,
122 .read_packet = read_packet,
123 };
124 #endif
125
126 #if CONFIG_BIT_MUXER
127 ✗ static av_cold int init(AVFormatContext *s)
128 {
129 ✗ AVCodecParameters *par = s->streams[0]->codecpar;
130
131 ✗ if (par->ch_layout.nb_channels != 1) {
132 ✗ av_log(s, AV_LOG_ERROR,
133 "only codec g729 with 1 channel is supported by this format\n");
134 ✗ return AVERROR(EINVAL);
135 }
136
137 ✗ par->bits_per_coded_sample = 16;
138 ✗ par->block_align = (par->bits_per_coded_sample * par->ch_layout.nb_channels) >> 3;
139
140 ✗ return 0;
141 }
142
143 ✗ static int write_packet(AVFormatContext *s, AVPacket *pkt)
144 {
145 ✗ AVIOContext *pb = s->pb;
146 GetBitContext gb;
147 int i;
148
149 ✗ if (pkt->size != 10)
150 ✗ return AVERROR(EINVAL);
151
152 ✗ avio_wl16(pb, SYNC_WORD);
153 ✗ avio_wl16(pb, 8 * pkt->size);
154
155 ✗ init_get_bits(&gb, pkt->data, 8 * pkt->size);
156 ✗ for (i = 0; i < 8 * pkt->size; i++)
157 ✗ avio_wl16(pb, get_bits1(&gb) ? BIT_1 : BIT_0);
158
159 ✗ return 0;
160 }
161
162 const FFOutputFormat ff_bit_muxer = {
163 .p.name = "bit",
164 .p.long_name = NULL_IF_CONFIG_SMALL("G.729 BIT file format"),
165 .p.mime_type = "audio/bit",
166 .p.extensions = "bit",
167 .p.audio_codec = AV_CODEC_ID_G729,
168 .p.video_codec = AV_CODEC_ID_NONE,
169 .p.subtitle_codec = AV_CODEC_ID_NONE,
170 .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH |
171 FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
172 .init = init,
173 .write_packet = write_packet,
174 };
175 #endif
176