FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/westwood_aud.c
Date: 2026-04-21 03:24:50
Exec Total Coverage
Lines: 46 71 64.8%
Functions: 3 3 100.0%
Branches: 22 37 59.5%
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1 /*
2 * Westwood Studios AUD Format Demuxer
3 * Copyright (c) 2003 The FFmpeg project
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 * Westwood Studios AUD file demuxer
25 * by Mike Melanson (melanson@pcisys.net)
26 * for more information on the Westwood file formats, visit:
27 * http://www.pcisys.net/~melanson/codecs/
28 * http://www.geocities.com/SiliconValley/8682/aud3.txt
29 *
30 * Implementation note: There is no definite file signature for AUD files.
31 * The demuxer uses a probabilistic strategy for content detection. This
32 * entails performing sanity checks on certain header values in order to
33 * qualify a file. Refer to wsaud_probe() for the precise parameters.
34 */
35
36 #include "libavutil/channel_layout.h"
37 #include "libavutil/intreadwrite.h"
38 #include "avformat.h"
39 #include "avio_internal.h"
40 #include "demux.h"
41 #include "internal.h"
42
43 #define AUD_HEADER_SIZE 12
44 #define AUD_CHUNK_PREAMBLE_SIZE 8
45 #define AUD_CHUNK_SIGNATURE 0x0000DEAF
46
47 7467 static int wsaud_probe(const AVProbeData *p)
48 {
49 int field;
50
51 /* Probabilistic content detection strategy: There is no file signature
52 * so perform sanity checks on various header parameters:
53 * 8000 <= sample rate (16 bits) <= 48000 ==> 40001 acceptable numbers
54 * flags <= 0x03 (2 LSBs are used) ==> 4 acceptable numbers
55 * compression type (8 bits) = 1 or 99 ==> 2 acceptable numbers
56 * first audio chunk signature (32 bits) ==> 1 acceptable number
57 * The number space contains 2^64 numbers. There are 40001 * 4 * 2 * 1 =
58 * 320008 acceptable number combinations.
59 */
60
61
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 7467 if (p->buf_size < AUD_HEADER_SIZE + AUD_CHUNK_PREAMBLE_SIZE)
62 ✗ return 0;
63
64 /* check sample rate */
65 7467 field = AV_RL16(&p->buf[0]);
66
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 7467 if ((field < 8000) || (field > 48000))
67 2147 return 0;
68
69 /* enforce the rule that the top 6 bits of this flags field are reserved (0);
70 * this might not be true, but enforce it until deemed unnecessary */
71
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 5320 if (p->buf[10] & 0xFC)
72 4641 return 0;
73
74
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 679 if (p->buf[11] != 99 && p->buf[11] != 1)
75 661 return 0;
76
77 /* read ahead to the first audio chunk and validate the first header signature */
78
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 18 if (AV_RL32(&p->buf[16]) != AUD_CHUNK_SIGNATURE)
79 16 return 0;
80
81 /* return 1/2 certainty since this file check is a little sketchy */
82 2 return AVPROBE_SCORE_EXTENSION;
83 }
84
85 2 static int wsaud_read_header(AVFormatContext *s)
86 {
87 2 AVIOContext *pb = s->pb;
88 AVStream *st;
89 unsigned char header[AUD_HEADER_SIZE];
90 int sample_rate, channels, codec;
91 int ret;
92
93
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 2 if ((ret = ffio_read_size(pb, header, AUD_HEADER_SIZE)) < 0)
94 ✗ return ret;
95
96 2 sample_rate = AV_RL16(&header[0]);
97 2 channels = (header[10] & 0x1) + 1;
98 2 codec = header[11];
99
100 /* initialize the audio decoder stream */
101 2 st = avformat_new_stream(s, NULL);
102
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 2 if (!st)
103 ✗ return AVERROR(ENOMEM);
104
105
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 2 switch (codec) {
106 ✗ case 1:
107 ✗ if (channels != 1) {
108 ✗ avpriv_request_sample(s, "Stereo WS-SND1");
109 ✗ return AVERROR_PATCHWELCOME;
110 }
111 ✗ st->codecpar->codec_id = AV_CODEC_ID_WESTWOOD_SND1;
112 ✗ break;
113 2 case 99:
114 2 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WS;
115 2 st->codecpar->bits_per_coded_sample = 4;
116 2 st->codecpar->bit_rate = channels * sample_rate * 4;
117 2 break;
118 ✗ default:
119 ✗ avpriv_request_sample(s, "Unknown codec: %d", codec);
120 ✗ return AVERROR_PATCHWELCOME;
121 }
122 2 avpriv_set_pts_info(st, 64, 1, sample_rate);
123 2 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
124 2 av_channel_layout_default(&st->codecpar->ch_layout, channels);
125 2 st->codecpar->sample_rate = sample_rate;
126
127 2 return 0;
128 }
129
130 273 static int wsaud_read_packet(AVFormatContext *s,
131 AVPacket *pkt)
132 {
133 273 AVIOContext *pb = s->pb;
134 unsigned char preamble[AUD_CHUNK_PREAMBLE_SIZE];
135 unsigned int chunk_size;
136 273 int ret = 0;
137 273 AVStream *st = s->streams[0];
138
139
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 273 if ((ret = ffio_read_size(pb, preamble, AUD_CHUNK_PREAMBLE_SIZE)) < 0)
140 3 return ret;
141
142 /* validate the chunk */
143
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 270 if (AV_RL32(&preamble[4]) != AUD_CHUNK_SIGNATURE)
144 ✗ return AVERROR_INVALIDDATA;
145
146 270 chunk_size = AV_RL16(&preamble[0]);
147
148
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 270 if (st->codecpar->codec_id == AV_CODEC_ID_WESTWOOD_SND1) {
149 /* For Westwood SND1 audio we need to add the output size and input
150 size to the start of the packet to match what is in VQA.
151 Specifically, this is needed to signal when a packet should be
152 decoding as raw 8-bit pcm or variable-size ADPCM. */
153 ✗ int out_size = AV_RL16(&preamble[2]);
154 ✗ if ((ret = av_new_packet(pkt, chunk_size + 4)) < 0)
155 ✗ return ret;
156 ✗ if ((ret = ffio_read_size(pb, &pkt->data[4], chunk_size)) < 0)
157 ✗ return ret;
158 ✗ AV_WL16(&pkt->data[0], out_size);
159 ✗ AV_WL16(&pkt->data[2], chunk_size);
160
161 ✗ pkt->duration = out_size;
162 } else {
163 270 ret = av_get_packet(pb, pkt, chunk_size);
164
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 270 if (ret != chunk_size)
165 ✗ return AVERROR_INVALIDDATA;
166
167
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 270 if (st->codecpar->ch_layout.nb_channels <= 0) {
168 ✗ av_log(s, AV_LOG_ERROR, "invalid number of channels %d\n",
169 ✗ st->codecpar->ch_layout.nb_channels);
170 ✗ return AVERROR_INVALIDDATA;
171 }
172
173 /* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
174 270 pkt->duration = (chunk_size * 2) / st->codecpar->ch_layout.nb_channels;
175 }
176 270 pkt->stream_index = st->index;
177
178 270 return ret;
179 }
180
181 const FFInputFormat ff_wsaud_demuxer = {
182 .p.name = "wsaud",
183 .p.long_name = NULL_IF_CONFIG_SMALL("Westwood Studios audio"),
184 .read_probe = wsaud_probe,
185 .read_header = wsaud_read_header,
186 .read_packet = wsaud_read_packet,
187 };
188