1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/*
* Copyright (c) 2021 Aidan Richmond
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Westwood Studios AUD file muxer
* by Aidan Richmond (aidan.is@hotmail.co.uk)
*
* This muxer supports IMA ADPCM packed in westwoods format.
*
* @see http://xhp.xwis.net/documents/aud3.txt
*/
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "mux.h"
#include <stdint.h>
#define AUD_CHUNK_SIGNATURE 0x0000DEAF
typedef struct AUDMuxContext {
int uncomp_size;
int size;
} AUDMuxContext;
static int wsaud_write_init(AVFormatContext *ctx)
{
AVStream *st = ctx->streams[0];
AVIOContext *pb = ctx->pb;
/* Stream must be seekable to correctly write the file. */
if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
av_log(ctx, AV_LOG_ERROR, "Cannot write Westwood AUD to"
" non-seekable stream.\n");
return AVERROR(EINVAL);
}
if (st->codecpar->codec_id != AV_CODEC_ID_ADPCM_IMA_WS) {
av_log(ctx, AV_LOG_ERROR, "%s codec not supported for Westwood AUD.\n",
avcodec_get_name(st->codecpar->codec_id));
return AVERROR(EINVAL);
}
return 0;
}
static int wsaud_write_header(AVFormatContext *ctx)
{
AVStream *st = ctx->streams[0];
AVIOContext *pb = ctx->pb;
AUDMuxContext *a = ctx->priv_data;
unsigned char flags = 0;
a->uncomp_size = 0;
a->size = 0;
/* Flag if we have stereo data. */
if (st->codecpar->ch_layout.nb_channels == 2)
flags |= 1;
/* This flags that the file contains 16 bit samples rather than 8 bit
since the encoder only encodes 16 bit samples this should be set. */
if (av_get_bits_per_sample(st->codecpar->codec_id) == 4)
flags |= 2;
avio_wl16(pb, st->codecpar->sample_rate);
/* We don't know the file size yet, so just zero 8 bytes */
ffio_fill(pb, 0, 8);
avio_w8(pb, flags);
/* 99 indicates the ADPCM format. Other formats not supported. */
avio_w8(pb, 99);
return 0;
}
static int wsaud_write_packet(AVFormatContext *ctx, AVPacket *pkt)
{
AVIOContext *pb = ctx->pb;
AUDMuxContext *a = ctx->priv_data;
if (pkt->size > UINT16_MAX / 4)
return AVERROR_INVALIDDATA;
/* Assumes ADPCM since this muxer doesn't support SND1 or PCM format. */
avio_wl16(pb, pkt->size);
avio_wl16(pb, pkt->size * 4);
avio_wl32(pb, AUD_CHUNK_SIGNATURE);
avio_write(pb, pkt->data, pkt->size);
a->size += pkt->size + 8;
a->uncomp_size += pkt->size * 4;
return 0;
}
static int wsaud_write_trailer(AVFormatContext *ctx)
{
AVIOContext *pb = ctx->pb;
AUDMuxContext *a = ctx->priv_data;
avio_seek(pb, 2, SEEK_SET);
avio_wl32(pb, a->size);
avio_wl32(pb, a->uncomp_size);
return 0;
}
const FFOutputFormat ff_wsaud_muxer = {
.p.name = "wsaud",
.p.long_name = NULL_IF_CONFIG_SMALL("Westwood Studios audio"),
.p.extensions = "aud",
.priv_data_size = sizeof(AUDMuxContext),
.p.audio_codec = AV_CODEC_ID_ADPCM_IMA_WS,
.p.video_codec = AV_CODEC_ID_NONE,
.p.subtitle_codec = AV_CODEC_ID_NONE,
.init = wsaud_write_init,
.write_header = wsaud_write_header,
.write_packet = wsaud_write_packet,
.write_trailer = wsaud_write_trailer,
.flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH,
};
|
