FFmpeg
sol.c
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1 /*
2  * Sierra SOL demuxer
3  * Copyright 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 /*
23  * Based on documents from Game Audio Player and own research
24  */
25 
27 #include "libavutil/intreadwrite.h"
28 #include "avformat.h"
29 #include "internal.h"
30 #include "pcm.h"
31 
32 /* if we don't know the size in advance */
33 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
34 
35 static int sol_probe(const AVProbeData *p)
36 {
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;
43  else
44  return 0;
45 }
46 
47 #define SOL_DPCM 1
48 #define SOL_16BIT 4
49 #define SOL_STEREO 16
50 
51 static enum AVCodecID sol_codec_id(int magic, int type)
52 {
53  if (type & SOL_DPCM)
54  return AV_CODEC_ID_SOL_DPCM;
55 
56  if (magic == 0x0B8D)
57  return AV_CODEC_ID_PCM_U8;
58 
59  if (type & SOL_16BIT)
60  return AV_CODEC_ID_PCM_S16LE;
61 
62  return AV_CODEC_ID_PCM_U8;
63 }
64 
65 static int sol_codec_type(int magic, int type)
66 {
67  if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
68  if (type & SOL_DPCM)
69  {
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;
73  }
74  return -1;
75 }
76 
77 static int sol_channels(int magic, int type)
78 {
79  if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
80  return 2;
81 }
82 
84 {
85  unsigned int magic,tag;
86  AVIOContext *pb = s->pb;
87  unsigned int id, channels, rate, type;
88  enum AVCodecID codec;
89  AVStream *st;
90 
91  /* check ".snd" header */
92  magic = avio_rl16(pb);
93  tag = avio_rl32(pb);
94  if (tag != MKTAG('S', 'O', 'L', 0))
95  return -1;
96  rate = avio_rl16(pb);
97  type = avio_r8(pb);
98  avio_skip(pb, 4); /* size */
99  if (magic != 0x0B8D)
100  avio_r8(pb); /* newer SOLs contain padding byte */
101 
102  codec = sol_codec_id(magic, type);
103  channels = sol_channels(magic, type);
104 
105  if (codec == AV_CODEC_ID_SOL_DPCM)
106  id = sol_codec_type(magic, type);
107  else id = 0;
108 
109  /* now we are ready: build format streams */
110  st = avformat_new_stream(s, NULL);
111  if (!st)
112  return -1;
114  st->codecpar->codec_tag = id;
115  st->codecpar->codec_id = codec;
117  st->codecpar->sample_rate = rate;
118  avpriv_set_pts_info(st, 64, 1, rate);
119  return 0;
120 }
121 
122 #define MAX_SIZE 4096
123 
125  AVPacket *pkt)
126 {
127  int ret;
128 
129  if (avio_feof(s->pb))
130  return AVERROR(EIO);
131  ret= av_get_packet(s->pb, pkt, MAX_SIZE);
132  if (ret < 0)
133  return ret;
135  pkt->stream_index = 0;
136  return 0;
137 }
138 
140  .name = "sol",
141  .long_name = NULL_IF_CONFIG_SMALL("Sierra SOL"),
142  .read_probe = sol_probe,
143  .read_header = sol_read_header,
144  .read_packet = sol_read_packet,
145  .read_seek = ff_pcm_read_seek,
146 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:325
sol_channels
static int sol_channels(int magic, int type)
Definition: sol.c:77
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: options.c:237
pcm.h
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:57
sol_probe
static int sol_probe(const AVProbeData *p)
Definition: sol.c:35
AV_CODEC_ID_SOL_DPCM
@ AV_CODEC_ID_SOL_DPCM
Definition: codec_id.h:428
sol_read_packet
static int sol_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: sol.c:124
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:65
sol_codec_type
static int sol_codec_type(int magic, int type)
Definition: sol.c:65
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:465
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:763
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:745
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:656
AV_PKT_FLAG_CORRUPT
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: packet.h:430
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:256
MAX_SIZE
#define MAX_SIZE
Definition: sol.c:122
SOL_STEREO
#define SOL_STEREO
Definition: sol.c:49
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:455
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
channels
channels
Definition: aptx.h:31
AVFormatContext
Format I/O context.
Definition: avformat.h:1216
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
NULL
#define NULL
Definition: coverity.c:32
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:453
av_channel_layout_default
void av_channel_layout_default(AVChannelLayout *ch_layout, int nb_channels)
Get the default channel layout for a given number of channels.
Definition: channel_layout.c:960
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:212
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:177
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:49
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:761
AVIOContext
Bytestream IO Context.
Definition: avio.h:166
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:115
sol_codec_id
static enum AVCodecID sol_codec_id(int magic, int type)
Definition: sol.c:51
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:634
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:380
SOL_DPCM
#define SOL_DPCM
Definition: sol.c:47
av_get_packet
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:102
tag
uint32_t tag
Definition: movenc.c:1646
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:948
ff_pcm_read_seek
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:56
avformat.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
id
enum AVCodecID id
Definition: dts2pts_bsf.c:362
channel_layout.h
AVPacket::stream_index
int stream_index
Definition: packet.h:376
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:349
AV_CODEC_ID_PCM_U8
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:330
sol_read_header
static int sol_read_header(AVFormatContext *s)
Definition: sol.c:83
ff_sol_demuxer
const AVInputFormat ff_sol_demuxer
Definition: sol.c:139
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:61
AVPacket
This structure stores compressed data.
Definition: packet.h:351
SOL_16BIT
#define SOL_16BIT
Definition: sol.c:48
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:377