3 * Copyright Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
23 * Based on documents from Game Audio Player and own research
26 #include "libavutil/channel_layout.h"
27 #include "libavutil/intreadwrite.h"
32 /* if we don't know the size in advance */
33 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
35 static int sol_probe(AVProbeData
*p
)
37 /* check file header */
38 uint16_t magic
= AV_RL32(p
->buf
);
39 if ((magic
== 0x0B8D || magic
== 0x0C0D || magic
== 0x0C8D) &&
40 p
->buf
[2] == 'S' && p
->buf
[3] == 'O' &&
41 p
->buf
[4] == 'L' && p
->buf
[5] == 0)
42 return AVPROBE_SCORE_MAX
;
51 static enum AVCodecID
sol_codec_id(int magic
, int type
)
54 return AV_CODEC_ID_SOL_DPCM
;
57 return AV_CODEC_ID_PCM_U8
;
60 return AV_CODEC_ID_PCM_S16LE
;
62 return AV_CODEC_ID_PCM_U8
;
65 static int sol_codec_type(int magic
, int type
)
67 if (magic
== 0x0B8D) return 1;//SOL_DPCM_OLD;
70 if (type
& SOL_16BIT
) return 3;//SOL_DPCM_NEW16;
71 else if (magic
== 0x0C8D) return 1;//SOL_DPCM_OLD;
72 else return 2;//SOL_DPCM_NEW8;
77 static int sol_channels(int magic
, int type
)
79 if (magic
== 0x0B8D || !(type
& SOL_STEREO
)) return 1;
83 static int sol_read_header(AVFormatContext
*s
)
85 unsigned int magic
,tag
;
86 AVIOContext
*pb
= s
->pb
;
87 unsigned int id
, channels
, rate
, type
;
91 /* check ".snd" header */
92 magic
= avio_rl16(pb
);
94 if (tag
!= MKTAG('S', 'O', 'L', 0))
98 avio_skip(pb
, 4); /* size */
100 avio_r8(pb
); /* newer SOLs contain padding byte */
102 codec
= sol_codec_id(magic
, type
);
103 channels
= sol_channels(magic
, type
);
105 if (codec
== AV_CODEC_ID_SOL_DPCM
)
106 id
= sol_codec_type(magic
, type
);
109 /* now we are ready: build format streams */
110 st
= avformat_new_stream(s
, NULL
);
113 st
->codec
->codec_type
= AVMEDIA_TYPE_AUDIO
;
114 st
->codec
->codec_tag
= id
;
115 st
->codec
->codec_id
= codec
;
116 st
->codec
->channels
= channels
;
117 st
->codec
->channel_layout
= channels
== 1 ? AV_CH_LAYOUT_MONO
:
119 st
->codec
->sample_rate
= rate
;
120 avpriv_set_pts_info(st
, 64, 1, rate
);
124 #define MAX_SIZE 4096
126 static int sol_read_packet(AVFormatContext
*s
,
131 if (avio_feof(s
->pb
))
133 ret
= av_get_packet(s
->pb
, pkt
, MAX_SIZE
);
136 pkt
->flags
&= ~AV_PKT_FLAG_CORRUPT
;
137 pkt
->stream_index
= 0;
141 AVInputFormat ff_sol_demuxer
= {
143 .long_name
= NULL_IF_CONFIG_SMALL("Sierra SOL"),
144 .read_probe
= sol_probe
,
145 .read_header
= sol_read_header
,
146 .read_packet
= sol_read_packet
,
147 .read_seek
= ff_pcm_read_seek
,