FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ws-snd1.c
Date: 2026-01-16 07:34:38
Exec Total Coverage
Lines: 77 88 87.5%
Functions: 2 2 100.0%
Branches: 32 40 80.0%
Line Branch Exec Source
1 /*
2 * Westwood SNDx codecs
3 * Copyright (c) 2005 Konstantin Shishkov
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 <stdint.h>
23
24 #include "libavutil/channel_layout.h"
25 #include "libavutil/common.h"
26 #include "libavutil/intreadwrite.h"
27 #include "avcodec.h"
28 #include "codec_internal.h"
29 #include "decode.h"
30
31 /**
32 * @file
33 * Westwood SNDx codecs
34 *
35 * Reference documents about VQA format and its audio codecs
36 * can be found here:
37 * http://www.multimedia.cx
38 */
39
40 static const int8_t ws_adpcm_4bit[] = {
41 -9, -8, -6, -5, -4, -3, -2, -1,
42 0, 1, 2, 3, 4, 5, 6, 8
43 };
44
45 2 static av_cold int ws_snd_decode_init(AVCodecContext *avctx)
46 {
47 2 av_channel_layout_uninit(&avctx->ch_layout);
48 2 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
49 2 avctx->sample_fmt = AV_SAMPLE_FMT_U8;
50
51 2 return 0;
52 }
53
54 12 static int ws_snd_decode_frame(AVCodecContext *avctx, AVFrame *frame,
55 int *got_frame_ptr, AVPacket *avpkt)
56 {
57 12 const uint8_t *buf = avpkt->data;
58 12 int buf_size = avpkt->size;
59
60 int in_size, out_size, ret;
61 12 int sample = 128;
62 uint8_t *samples;
63 uint8_t *samples_end;
64
65
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 12 if (!buf_size)
66 ✗ return 0;
67
68
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 12 if (buf_size < 4) {
69 ✗ av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
70 ✗ return AVERROR(EINVAL);
71 }
72
73 12 out_size = AV_RL16(&buf[0]);
74 12 in_size = AV_RL16(&buf[2]);
75 12 buf += 4;
76
77
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 12 if (in_size > buf_size) {
78 ✗ av_log(avctx, AV_LOG_ERROR, "Frame data is larger than input buffer\n");
79 ✗ return AVERROR_INVALIDDATA;
80 }
81
82 /* get output buffer */
83 12 frame->nb_samples = out_size;
84
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 12 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
85 ✗ return ret;
86 12 samples = frame->data[0];
87 12 samples_end = samples + out_size;
88
89
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 12 if (in_size == out_size) {
90 ✗ memcpy(samples, buf, out_size);
91 ✗ *got_frame_ptr = 1;
92 ✗ return buf_size;
93 }
94
95
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 12139 while (samples < samples_end && buf - avpkt->data < buf_size) {
96 int code, smp, size;
97 uint8_t count;
98 12127 code = *buf >> 6;
99 12127 count = *buf & 0x3F;
100 12127 buf++;
101
102 /* make sure we don't write past the output buffer */
103
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 12127 switch (code) {
104 29 case 0: smp = 4 * (count + 1); break;
105 4143 case 1: smp = 2 * (count + 1); break;
106
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 7950 case 2: smp = (count & 0x20) ? 1 : count + 1; break;
107 5 default: smp = count + 1; break;
108 }
109
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 12127 if (samples_end - samples < smp)
110 ✗ break;
111
112 /* make sure we don't read past the input buffer */
113
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 12127 size = ((code == 2 && (count & 0x20)) || code == 3) ? 0 : count + 1;
114
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 12127 if ((buf - avpkt->data) + size > buf_size)
115 ✗ break;
116
117
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 12127 switch (code) {
118 29 case 0: /* ADPCM 2-bit */
119
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 58 for (count++; count > 0; count--) {
120 29 code = *buf++;
121 29 sample += ( code & 0x3) - 2;
122 29 sample = av_clip_uint8(sample);
123 29 *samples++ = sample;
124 29 sample += ((code >> 2) & 0x3) - 2;
125 29 sample = av_clip_uint8(sample);
126 29 *samples++ = sample;
127 29 sample += ((code >> 4) & 0x3) - 2;
128 29 sample = av_clip_uint8(sample);
129 29 *samples++ = sample;
130 29 sample += (code >> 6) - 2;
131 29 sample = av_clip_uint8(sample);
132 29 *samples++ = sample;
133 }
134 29 break;
135 4143 case 1: /* ADPCM 4-bit */
136
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 28339 for (count++; count > 0; count--) {
137 24196 code = *buf++;
138 24196 sample += ws_adpcm_4bit[code & 0xF];
139 24196 sample = av_clip_uint8(sample);
140 24196 *samples++ = sample;
141 24196 sample += ws_adpcm_4bit[code >> 4];
142 24196 sample = av_clip_uint8(sample);
143 24196 *samples++ = sample;
144 }
145 4143 break;
146 7950 case 2: /* no compression */
147
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 7950 if (count & 0x20) { /* big delta */
148 int8_t t;
149 7535 t = count;
150 7535 t <<= 3;
151 7535 sample += t >> 3;
152 7535 sample = av_clip_uint8(sample);
153 7535 *samples++ = sample;
154 } else { /* copy */
155 415 memcpy(samples, buf, smp);
156 415 samples += smp;
157 415 buf += smp;
158 415 sample = buf[-1];
159 }
160 7950 break;
161 5 default: /* run */
162 5 memset(samples, sample, smp);
163 5 samples += smp;
164 }
165 }
166
167 12 frame->nb_samples = samples - frame->data[0];
168 12 *got_frame_ptr = 1;
169
170 12 return buf_size;
171 }
172
173 const FFCodec ff_ws_snd1_decoder = {
174 .p.name = "ws_snd1",
175 CODEC_LONG_NAME("Westwood Audio (SND1)"),
176 .p.type = AVMEDIA_TYPE_AUDIO,
177 .p.id = AV_CODEC_ID_WESTWOOD_SND1,
178 .init = ws_snd_decode_init,
179 FF_CODEC_DECODE_CB(ws_snd_decode_frame),
180 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
181 };
182