FFmpeg
redspark.c
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1 /*
2  * RedSpark demuxer
3  * Copyright (c) 2013 James Almer
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 "libavcodec/bytestream.h"
23 #include "libavutil/intreadwrite.h"
24 #include "avformat.h"
25 #include "avio.h"
26 #include "internal.h"
27 
28 #define HEADER_SIZE 4096
29 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
30 
31 typedef struct RedSparkContext {
34 
35 static int redspark_probe(const AVProbeData *p)
36 {
37  uint32_t key, data;
38  uint8_t header[8];
39 
40  /* Decrypt first 8 bytes of the header */
41  data = AV_RB32(p->buf);
42  key = data ^ 0x52656453;
43  data ^= key;
45  key = rol(key, 11);
46 
47  key += rol(key, 3);
48  data = AV_RB32(p->buf + 4) ^ key;
49  AV_WB32(header + 4, data);
50 
51  if (AV_RB64(header) == AV_RB64("RedSpark"))
52  return AVPROBE_SCORE_MAX;
53 
54  return 0;
55 }
56 
58 {
59  AVIOContext *pb = s->pb;
60  RedSparkContext *redspark = s->priv_data;
61  AVCodecParameters *par;
62  GetByteContext gbc;
63  int i, coef_off, ret = 0;
64  uint32_t key, data;
65  uint8_t header[HEADER_SIZE];
66  AVStream *st;
67 
68  st = avformat_new_stream(s, NULL);
69  if (!st)
70  return AVERROR(ENOMEM);
71  par = st->codecpar;
72 
73  /* Decrypt header */
74  data = avio_rb32(pb);
75  key = data ^ 0x52656453;
76  data ^= key;
78  key = rol(key, 11);
79 
80  for (i = 4; i < HEADER_SIZE; i += 4) {
81  key += rol(key, 3);
82  data = avio_rb32(pb) ^ key;
83  AV_WB32(header + i, data);
84  }
85 
88 
90  bytestream2_seek(&gbc, 0x3c, SEEK_SET);
91  par->sample_rate = bytestream2_get_be32u(&gbc);
92  if (par->sample_rate <= 0 || par->sample_rate > 96000) {
93  av_log(s, AV_LOG_ERROR, "Invalid sample rate: %d\n", par->sample_rate);
94  return AVERROR_INVALIDDATA;
95  }
96 
97  st->duration = bytestream2_get_be32u(&gbc) * 14;
98  redspark->samples_count = 0;
99  bytestream2_skipu(&gbc, 10);
100  par->channels = bytestream2_get_byteu(&gbc);
101  if (!par->channels) {
102  return AVERROR_INVALIDDATA;
103  }
104 
105  coef_off = 0x54 + par->channels * 8;
106  if (bytestream2_get_byteu(&gbc)) // Loop flag
107  coef_off += 16;
108 
109  if (coef_off + par->channels * (32 + 14) > HEADER_SIZE) {
110  return AVERROR_INVALIDDATA;
111  }
112 
113  if (ff_alloc_extradata(par, 32 * par->channels)) {
114  return AVERROR_INVALIDDATA;
115  }
116 
117  /* Get the ADPCM table */
118  bytestream2_seek(&gbc, coef_off, SEEK_SET);
119  for (i = 0; i < par->channels; i++) {
120  if (bytestream2_get_bufferu(&gbc, par->extradata + i * 32, 32) != 32) {
121  return AVERROR_INVALIDDATA;
122  }
123  bytestream2_skipu(&gbc, 14);
124  }
125 
126  avpriv_set_pts_info(st, 64, 1, par->sample_rate);
127 
128  return ret;
129 }
130 
132 {
133  AVCodecParameters *par = s->streams[0]->codecpar;
134  RedSparkContext *redspark = s->priv_data;
135  uint32_t size = 8 * par->channels;
136  int ret;
137 
138  if (avio_feof(s->pb) || redspark->samples_count == s->streams[0]->duration)
139  return AVERROR_EOF;
140 
141  ret = av_get_packet(s->pb, pkt, size);
142  if (ret != size) {
143  return AVERROR(EIO);
144  }
145 
146  pkt->duration = 14;
147  redspark->samples_count += pkt->duration;
148  pkt->stream_index = 0;
149 
150  return ret;
151 }
152 
154  .name = "redspark",
155  .long_name = NULL_IF_CONFIG_SMALL("RedSpark"),
156  .priv_data_size = sizeof(RedSparkContext),
160  .extensions = "rsd",
161 };
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
redspark_probe
static int redspark_probe(const AVProbeData *p)
Definition: redspark.c:35
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: utils.c:724
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
GetByteContext
Definition: bytestream.h:33
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
bytestream2_skipu
static av_always_inline void bytestream2_skipu(GetByteContext *g, unsigned int size)
Definition: bytestream.h:174
bytestream2_seek
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
Definition: bytestream.h:212
data
const char data[16]
Definition: mxf.c:143
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:391
ff_redspark_demuxer
const AVInputFormat ff_redspark_demuxer
Definition: redspark.c:153
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:888
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:773
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AVInputFormat
Definition: avformat.h:626
redspark_read_packet
static int redspark_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: redspark.c:131
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:631
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
RedSparkContext
Definition: redspark.c:31
key
const char * key
Definition: hwcontext_opencl.c:168
AVFormatContext
Format I/O context.
Definition: avformat.h:1097
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:992
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
AV_WB32
#define AV_WB32(p, v)
Definition: intreadwrite.h:419
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
redspark_read_header
static int redspark_read_header(AVFormatContext *s)
Definition: redspark.c:57
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:117
size
int size
Definition: twinvq_data.h:10344
avio.h
AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:96
header
static const uint8_t header[24]
Definition: sdr2.c:67
i
int i
Definition: input.c:406
RedSparkContext::samples_count
int samples_count
Definition: redspark.c:32
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:196
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:845
avformat.h
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: utils.c:1146
AVPacket::stream_index
int stream_index
Definition: packet.h:375
AV_CODEC_ID_ADPCM_THP
@ AV_CODEC_ID_ADPCM_THP
Definition: codec_id.h:370
bytestream2_get_bufferu
static av_always_inline unsigned int bytestream2_get_bufferu(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:277
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
bytestream.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
rol
#define rol(value, bits)
Definition: redspark.c:29
AV_RB64
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_RB64
Definition: bytestream.h:95
HEADER_SIZE
#define HEADER_SIZE
Definition: redspark.c:28
ff_alloc_extradata
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0.
Definition: utils.c:451
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:360