FFmpeg
siff.c
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1 /*
2  * Beam Software SIFF demuxer
3  * Copyright (c) 2007 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 
23 #include "libavutil/intreadwrite.h"
24 
25 #include "avformat.h"
26 #include "internal.h"
27 #include "avio_internal.h"
28 
29 enum SIFFTags {
30  TAG_SIFF = MKTAG('S', 'I', 'F', 'F'),
31  TAG_BODY = MKTAG('B', 'O', 'D', 'Y'),
32  TAG_VBHD = MKTAG('V', 'B', 'H', 'D'),
33  TAG_SHDR = MKTAG('S', 'H', 'D', 'R'),
34  TAG_VBV1 = MKTAG('V', 'B', 'V', '1'),
35  TAG_SOUN = MKTAG('S', 'O', 'U', 'N'),
36 };
37 
38 enum VBFlags {
39  VB_HAS_GMC = 0x01,
40  VB_HAS_AUDIO = 0x04,
41  VB_HAS_VIDEO = 0x08,
44 };
45 
46 typedef struct SIFFContext {
47  int frames;
48  int cur_frame;
49  int rate;
50  int bits;
52 
53  int has_video;
54  int has_audio;
55 
56  int curstrm;
57  unsigned int pktsize;
58  int gmcsize;
59  unsigned int sndsize;
60 
61  unsigned int flags;
63 } SIFFContext;
64 
65 static int siff_probe(const AVProbeData *p)
66 {
67  uint32_t tag = AV_RL32(p->buf + 8);
68  /* check file header */
69  if (AV_RL32(p->buf) != TAG_SIFF ||
70  (tag != TAG_VBV1 && tag != TAG_SOUN))
71  return 0;
72  return AVPROBE_SCORE_MAX;
73 }
74 
76 {
77  AVStream *ast;
78  ast = avformat_new_stream(s, NULL);
79  if (!ast)
80  return AVERROR(ENOMEM);
83  ast->codecpar->channels = 1;
86  ast->codecpar->sample_rate = c->rate;
87  avpriv_set_pts_info(ast, 16, 1, c->rate);
88  ast->start_time = 0;
89  return 0;
90 }
91 
93 {
94  AVStream *st;
95  int width, height;
96 
97  if (avio_rl32(pb) != TAG_VBHD) {
98  av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
99  return AVERROR_INVALIDDATA;
100  }
101  if (avio_rb32(pb) != 32) {
102  av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
103  return AVERROR_INVALIDDATA;
104  }
105  if (avio_rl16(pb) != 1) {
106  av_log(s, AV_LOG_ERROR, "Incorrect header version\n");
107  return AVERROR_INVALIDDATA;
108  }
109  width = avio_rl16(pb);
110  height = avio_rl16(pb);
111  avio_skip(pb, 4);
112  c->frames = avio_rl16(pb);
113  if (!c->frames) {
114  av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
115  return AVERROR_INVALIDDATA;
116  }
117  c->bits = avio_rl16(pb);
118  c->rate = avio_rl16(pb);
119  c->block_align = c->rate * (c->bits >> 3);
120 
121  avio_skip(pb, 16); // zeroes
122 
123  st = avformat_new_stream(s, NULL);
124  if (!st)
125  return AVERROR(ENOMEM);
128  st->codecpar->codec_tag = MKTAG('V', 'B', 'V', '1');
129  st->codecpar->width = width;
130  st->codecpar->height = height;
132  st->nb_frames =
133  st->duration = c->frames;
134  avpriv_set_pts_info(st, 16, 1, 12);
135 
136  c->cur_frame = 0;
137  c->has_video = 1;
138  c->has_audio = !!c->rate;
139  c->curstrm = -1;
140  if (c->has_audio)
141  return create_audio_stream(s, c);
142  return 0;
143 }
144 
146 {
147  if (avio_rl32(pb) != TAG_SHDR) {
148  av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
149  return AVERROR_INVALIDDATA;
150  }
151  if (avio_rb32(pb) != 8) {
152  av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
153  return AVERROR_INVALIDDATA;
154  }
155  avio_skip(pb, 4); // unknown value
156  c->rate = avio_rl16(pb);
157  c->bits = avio_rl16(pb);
158  c->block_align = c->rate * (c->bits >> 3);
159  return create_audio_stream(s, c);
160 }
161 
163 {
164  AVIOContext *pb = s->pb;
165  SIFFContext *c = s->priv_data;
166  uint32_t tag;
167  int ret;
168 
169  if (avio_rl32(pb) != TAG_SIFF)
170  return AVERROR_INVALIDDATA;
171  avio_skip(pb, 4); // ignore size
172  tag = avio_rl32(pb);
173 
174  if (tag != TAG_VBV1 && tag != TAG_SOUN) {
175  av_log(s, AV_LOG_ERROR, "Not a VBV file\n");
176  return AVERROR_INVALIDDATA;
177  }
178 
179  if (tag == TAG_VBV1 && (ret = siff_parse_vbv1(s, c, pb)) < 0)
180  return ret;
181  if (tag == TAG_SOUN && (ret = siff_parse_soun(s, c, pb)) < 0)
182  return ret;
183  if (avio_rl32(pb) != MKTAG('B', 'O', 'D', 'Y')) {
184  av_log(s, AV_LOG_ERROR, "'BODY' chunk is missing\n");
185  return AVERROR_INVALIDDATA;
186  }
187  avio_skip(pb, 4); // ignore size
188 
189  return 0;
190 }
191 
193 {
194  SIFFContext *c = s->priv_data;
195 
196  if (c->has_video) {
197  unsigned int size;
198  if (c->cur_frame >= c->frames)
199  return AVERROR_EOF;
200  if (c->curstrm == -1) {
201  c->pktsize = avio_rl32(s->pb) - 4;
202  c->flags = avio_rl16(s->pb);
203  c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;
204  if (c->gmcsize)
205  avio_read(s->pb, c->gmc, c->gmcsize);
206  c->sndsize = (c->flags & VB_HAS_AUDIO) ? avio_rl32(s->pb) : 0;
207  c->curstrm = !!(c->flags & VB_HAS_AUDIO);
208  }
209 
210  if (!c->curstrm) {
211  if (c->pktsize < 2LL + c->sndsize + c->gmcsize)
212  return AVERROR_INVALIDDATA;
213 
214  size = c->pktsize - c->sndsize - c->gmcsize - 2;
215  size = ffio_limit(s->pb, size);
216  if (av_new_packet(pkt, size + c->gmcsize + 2) < 0)
217  return AVERROR(ENOMEM);
218  AV_WL16(pkt->data, c->flags);
219  if (c->gmcsize)
220  memcpy(pkt->data + 2, c->gmc, c->gmcsize);
221  if (avio_read(s->pb, pkt->data + 2 + c->gmcsize, size) != size) {
222  av_packet_unref(pkt);
223  return AVERROR_INVALIDDATA;
224  }
225  pkt->stream_index = 0;
226  c->curstrm = -1;
227  } else {
228  int pktsize = av_get_packet(s->pb, pkt, c->sndsize - 4);
229  if (pktsize < 0)
230  return AVERROR(EIO);
231  pkt->stream_index = 1;
232  pkt->duration = pktsize;
233  c->curstrm = 0;
234  }
235  if (!c->cur_frame || c->curstrm)
236  pkt->flags |= AV_PKT_FLAG_KEY;
237  if (c->curstrm == -1)
238  c->cur_frame++;
239  } else {
240  int pktsize = av_get_packet(s->pb, pkt, c->block_align);
241  if (!pktsize)
242  return AVERROR_EOF;
243  if (pktsize <= 0)
244  return AVERROR(EIO);
245  pkt->duration = pktsize;
246  }
247  return pkt->size;
248 }
249 
251  .name = "siff",
252  .long_name = NULL_IF_CONFIG_SMALL("Beam Software SIFF"),
253  .priv_data_size = sizeof(SIFFContext),
257  .extensions = "vb,son",
258 };
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
SIFFTags
Definition: siff.c:29
void avpriv_set_pts_info(AVStream *s, 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:4929
unsigned int flags
Definition: siff.c:61
int frames
Definition: siff.c:47
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
int rate
Definition: siff.c:49
int size
Definition: avcodec.h:1481
Definition: siff.c:31
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:334
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1358
int ffio_limit(AVIOContext *s, int size)
Definition: utils.c:247
int curstrm
Definition: siff.c:56
uint8_t
int width
Video only.
Definition: avcodec.h:4034
static int create_audio_stream(AVFormatContext *s, SIFFContext *c)
Definition: siff.c:75
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:803
AVInputFormat ff_siff_demuxer
Definition: siff.c:250
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1498
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4502
int has_audio
Definition: siff.c:54
#define height
uint8_t * data
Definition: avcodec.h:1480
uint32_t tag
Definition: movenc.c:1531
#define AVERROR_EOF
End of file.
Definition: error.h:55
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:310
ptrdiff_t size
Definition: opengl_enc.c:100
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4070
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:650
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1512
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:772
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
Definition: siff.c:30
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
int has_video
Definition: siff.c:53
uint8_t gmc[4]
Definition: siff.c:62
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1486
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
static int siff_parse_soun(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)
Definition: siff.c:145
int cur_frame
Definition: siff.c:48
audio channel layout utility functions
static int siff_probe(const AVProbeData *p)
Definition: siff.c:65
#define width
#define s(width, name)
Definition: cbs_vp9.c:257
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
unsigned int sndsize
Definition: siff.c:59
static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: siff.c:192
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
int block_align
Definition: siff.c:51
Definition: siff.c:35
VBFlags
Definition: vb.c:34
Definition: siff.c:33
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
unsigned int pktsize
Definition: siff.c:57
Definition: siff.c:32
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:930
static int siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)
Definition: siff.c:92
int sample_rate
Audio only.
Definition: avcodec.h:4078
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:756
Main libavformat public API header.
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:920
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:932
void * priv_data
Format private data.
Definition: avformat.h:1386
int bits
Definition: siff.c:50
int gmcsize
Definition: siff.c:58
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4010
int channels
Audio only.
Definition: avcodec.h:4074
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3972
int stream_index
Definition: avcodec.h:1482
static int siff_read_header(AVFormatContext *s)
Definition: siff.c:162
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
#define AV_CH_LAYOUT_MONO
#define MKTAG(a, b, c, d)
Definition: common.h:366
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1457
Definition: siff.c:34