FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/act.c
Date: 2026-04-24 19:58:39
Exec Total Coverage
Lines: 9 99 9.1%
Functions: 1 3 33.3%
Branches: 10 44 22.7%
Line Branch Exec Source
1 /*
2 * ACT file format 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 "libavutil/intreadwrite.h"
23 #include "avformat.h"
24 #include "avio_internal.h"
25 #include "demux.h"
26 #include "riff.h"
27 #include "internal.h"
28
29 #define CHUNK_SIZE 512
30 #define RIFF_TAG MKTAG('R','I','F','F')
31 #define WAVE_TAG MKTAG('W','A','V','E')
32
33 typedef struct{
34 int bytes_left_in_chunk;
35 uint8_t audio_buffer[22];///< temporary buffer for ACT frame
36 char second_packet; ///< 1 - if temporary buffer contains valid (second) G.729 packet
37 } ACTContext;
38
39 7480 static int probe(const AVProbeData *p)
40 {
41 int i;
42
43
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 7480 if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
44
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 988 (AV_RL32(&p->buf[8]) != WAVE_TAG) ||
45
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 493 (AV_RL32(&p->buf[16]) != 16))
46 7465 return 0;
47
48 //We can't be sure that this is ACT and not regular WAV
49
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 15 if (p->buf_size<512)
50 ✗ return 0;
51
52
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 17 for(i=44; i<256; i++)
53
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 17 if(p->buf[i])
54 15 return 0;
55
56 ✗ if(p->buf[256]!=0x84)
57 ✗ return 0;
58
59 ✗ for(i=264; i<512; i++)
60 ✗ if(p->buf[i])
61 ✗ return 0;
62
63 ✗ return AVPROBE_SCORE_MAX;
64 }
65
66 ✗ static int read_header(AVFormatContext *s)
67 {
68 ✗ ACTContext* ctx = s->priv_data;
69 ✗ AVIOContext *pb = s->pb;
70 int size;
71 AVStream* st;
72 int ret;
73
74 int min,sec,msec;
75
76 ✗ st = avformat_new_stream(s, NULL);
77 ✗ if (!st)
78 ✗ return AVERROR(ENOMEM);
79
80 ✗ avio_skip(pb, 16);
81 ✗ size=avio_rl32(pb);
82 ✗ ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
83 ✗ if (ret < 0)
84 ✗ return ret;
85
86 /*
87 8000Hz (Fine-rec) file format has 10 bytes long
88 packets with 10ms of sound data in them
89 */
90 ✗ if (st->codecpar->sample_rate != 8000) {
91 ✗ av_log(s, AV_LOG_ERROR, "Sample rate %d is not supported.\n", st->codecpar->sample_rate);
92 ✗ return AVERROR_INVALIDDATA;
93 }
94
95 ✗ st->codecpar->frame_size=80;
96 ✗ st->codecpar->ch_layout.nb_channels = 1;
97 ✗ avpriv_set_pts_info(st, 64, 1, 100);
98
99 ✗ st->codecpar->codec_id=AV_CODEC_ID_G729;
100
101 ✗ avio_seek(pb, 257, SEEK_SET);
102 ✗ msec=avio_rl16(pb);
103 ✗ sec=avio_r8(pb);
104 ✗ min=avio_rl32(pb);
105
106 ✗ st->duration = av_rescale(1000*(min*60+sec)+msec, st->codecpar->sample_rate, 1000 * st->codecpar->frame_size);
107
108 ✗ ctx->bytes_left_in_chunk=CHUNK_SIZE;
109
110 ✗ avio_seek(pb, 512, SEEK_SET);
111
112 ✗ return 0;
113 }
114
115
116 ✗ static int read_packet(AVFormatContext *s,
117 AVPacket *pkt)
118 {
119 ✗ ACTContext *ctx = s->priv_data;
120 ✗ AVIOContext *pb = s->pb;
121 int ret;
122 ✗ int frame_size=s->streams[0]->codecpar->sample_rate==8000?10:22;
123
124
125 ✗ if(s->streams[0]->codecpar->sample_rate==8000)
126 ✗ ret=av_new_packet(pkt, 10);
127 else
128 ✗ ret=av_new_packet(pkt, 11);
129
130 ✗ if(ret)
131 ✗ return ret;
132
133 ✗ if(s->streams[0]->codecpar->sample_rate==4400 && !ctx->second_packet)
134 {
135 ✗ ret = ffio_read_size(pb, ctx->audio_buffer, frame_size);
136
137 ✗ if(ret<0)
138 ✗ return ret;
139
140 ✗ pkt->data[0]=ctx->audio_buffer[11];
141 ✗ pkt->data[1]=ctx->audio_buffer[0];
142 ✗ pkt->data[2]=ctx->audio_buffer[12];
143 ✗ pkt->data[3]=ctx->audio_buffer[1];
144 ✗ pkt->data[4]=ctx->audio_buffer[13];
145 ✗ pkt->data[5]=ctx->audio_buffer[2];
146 ✗ pkt->data[6]=ctx->audio_buffer[14];
147 ✗ pkt->data[7]=ctx->audio_buffer[3];
148 ✗ pkt->data[8]=ctx->audio_buffer[15];
149 ✗ pkt->data[9]=ctx->audio_buffer[4];
150 ✗ pkt->data[10]=ctx->audio_buffer[16];
151
152 ✗ ctx->second_packet=1;
153 }
154 ✗ else if(s->streams[0]->codecpar->sample_rate==4400 && ctx->second_packet)
155 {
156 ✗ pkt->data[0]=ctx->audio_buffer[5];
157 ✗ pkt->data[1]=ctx->audio_buffer[17];
158 ✗ pkt->data[2]=ctx->audio_buffer[6];
159 ✗ pkt->data[3]=ctx->audio_buffer[18];
160 ✗ pkt->data[4]=ctx->audio_buffer[7];
161 ✗ pkt->data[5]=ctx->audio_buffer[19];
162 ✗ pkt->data[6]=ctx->audio_buffer[8];
163 ✗ pkt->data[7]=ctx->audio_buffer[20];
164 ✗ pkt->data[8]=ctx->audio_buffer[9];
165 ✗ pkt->data[9]=ctx->audio_buffer[21];
166 ✗ pkt->data[10]=ctx->audio_buffer[10];
167
168 ✗ ctx->second_packet=0;
169 }
170 else // 8000 Hz
171 {
172 ✗ ret = ffio_read_size(pb, ctx->audio_buffer, frame_size);
173
174 ✗ if(ret<0)
175 ✗ return ret;
176
177 ✗ pkt->data[0]=ctx->audio_buffer[5];
178 ✗ pkt->data[1]=ctx->audio_buffer[0];
179 ✗ pkt->data[2]=ctx->audio_buffer[6];
180 ✗ pkt->data[3]=ctx->audio_buffer[1];
181 ✗ pkt->data[4]=ctx->audio_buffer[7];
182 ✗ pkt->data[5]=ctx->audio_buffer[2];
183 ✗ pkt->data[6]=ctx->audio_buffer[8];
184 ✗ pkt->data[7]=ctx->audio_buffer[3];
185 ✗ pkt->data[8]=ctx->audio_buffer[9];
186 ✗ pkt->data[9]=ctx->audio_buffer[4];
187 }
188
189 ✗ ctx->bytes_left_in_chunk -= frame_size;
190
191 ✗ if(ctx->bytes_left_in_chunk < frame_size)
192 {
193 ✗ avio_skip(pb, ctx->bytes_left_in_chunk);
194 ✗ ctx->bytes_left_in_chunk=CHUNK_SIZE;
195 }
196
197 ✗ pkt->duration=1;
198
199 ✗ return ret;
200 }
201
202 const FFInputFormat ff_act_demuxer = {
203 .p.name = "act",
204 .p.long_name = "ACT Voice file format",
205 .priv_data_size = sizeof(ACTContext),
206 .read_probe = probe,
207 .read_header = read_header,
208 .read_packet = read_packet,
209 };
210