FFmpeg
vqf.c
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1 /*
2  * VQF demuxer
3  * Copyright (c) 2009 Vitor Sessak
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 "avformat.h"
23 #include "internal.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/mathematics.h"
27 #include "riff.h"
28 
29 typedef struct VqfContext {
33 } VqfContext;
34 
35 static int vqf_probe(const AVProbeData *probe_packet)
36 {
37  if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N'))
38  return 0;
39 
40  if (!memcmp(probe_packet->buf + 4, "97012000", 8))
41  return AVPROBE_SCORE_MAX;
42 
43  if (!memcmp(probe_packet->buf + 4, "00052200", 8))
44  return AVPROBE_SCORE_MAX;
45 
46  if (AV_RL32(probe_packet->buf + 12) > (1<<27))
47  return AVPROBE_SCORE_EXTENSION/2;
48 
50 }
51 
52 static void add_metadata(AVFormatContext *s, uint32_t tag,
53  unsigned int tag_len, unsigned int remaining)
54 {
55  int len = FFMIN(tag_len, remaining);
56  char *buf, key[5] = {0};
57 
58  if (len == UINT_MAX)
59  return;
60 
61  buf = av_malloc(len+1);
62  if (!buf)
63  return;
64  avio_read(s->pb, buf, len);
65  buf[len] = 0;
66  AV_WL32(key, tag);
68 }
69 
71  { "(c) ", "copyright" },
72  { "ARNG", "arranger" },
73  { "AUTH", "author" },
74  { "BAND", "band" },
75  { "CDCT", "conductor" },
76  { "COMT", "comment" },
77  { "FILE", "filename" },
78  { "GENR", "genre" },
79  { "LABL", "publisher" },
80  { "MUSC", "composer" },
81  { "NAME", "title" },
82  { "NOTE", "note" },
83  { "PROD", "producer" },
84  { "PRSN", "personnel" },
85  { "REMX", "remixer" },
86  { "SING", "singer" },
87  { "TRCK", "track" },
88  { "WORD", "words" },
89  { 0 },
90 };
91 
93 {
94  VqfContext *c = s->priv_data;
96  int chunk_tag;
97  int rate_flag = -1;
98  int header_size;
99  int read_bitrate = 0;
100  int size;
101  uint8_t comm_chunk[12];
102 
103  if (!st)
104  return AVERROR(ENOMEM);
105 
106  avio_skip(s->pb, 12);
107 
108  header_size = avio_rb32(s->pb);
109 
112  st->start_time = 0;
113 
114  do {
115  int len;
116  chunk_tag = avio_rl32(s->pb);
117 
118  if (chunk_tag == MKTAG('D','A','T','A'))
119  break;
120 
121  len = avio_rb32(s->pb);
122 
123  if ((unsigned) len > INT_MAX/2) {
124  av_log(s, AV_LOG_ERROR, "Malformed header\n");
125  return -1;
126  }
127 
128  header_size -= 8;
129 
130  switch(chunk_tag){
131  case MKTAG('C','O','M','M'):
132  avio_read(s->pb, comm_chunk, 12);
133  st->codecpar->channels = AV_RB32(comm_chunk ) + 1;
134  read_bitrate = AV_RB32(comm_chunk + 4);
135  rate_flag = AV_RB32(comm_chunk + 8);
136  avio_skip(s->pb, len-12);
137 
138  if (st->codecpar->channels <= 0) {
139  av_log(s, AV_LOG_ERROR, "Invalid number of channels\n");
140  return AVERROR_INVALIDDATA;
141  }
142 
143  st->codecpar->bit_rate = (int64_t)read_bitrate * 1000;
144  break;
145  case MKTAG('D','S','I','Z'): // size of compressed data
146  {
147  av_dict_set_int(&s->metadata, "size", avio_rb32(s->pb), 0);
148  }
149  break;
150  case MKTAG('Y','E','A','R'): // recording date
151  case MKTAG('E','N','C','D'): // compression date
152  case MKTAG('E','X','T','R'): // reserved
153  case MKTAG('_','Y','M','H'): // reserved
154  case MKTAG('_','N','T','T'): // reserved
155  case MKTAG('_','I','D','3'): // reserved for ID3 tags
156  avio_skip(s->pb, FFMIN(len, header_size));
157  break;
158  default:
159  add_metadata(s, chunk_tag, len, header_size);
160  break;
161  }
162 
163  header_size -= len;
164 
165  } while (header_size >= 0 && !avio_feof(s->pb));
166 
167  switch (rate_flag) {
168  case -1:
169  av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
170  return -1;
171  case 44:
172  st->codecpar->sample_rate = 44100;
173  break;
174  case 22:
175  st->codecpar->sample_rate = 22050;
176  break;
177  case 11:
178  st->codecpar->sample_rate = 11025;
179  break;
180  default:
181  if (rate_flag < 8 || rate_flag > 44) {
182  av_log(s, AV_LOG_ERROR, "Invalid rate flag %d\n", rate_flag);
183  return AVERROR_INVALIDDATA;
184  }
185  st->codecpar->sample_rate = rate_flag*1000;
186  break;
187  }
188 
189  if (read_bitrate / st->codecpar->channels < 8 ||
190  read_bitrate / st->codecpar->channels > 48) {
191  av_log(s, AV_LOG_ERROR, "Invalid bitrate per channel %d\n",
192  read_bitrate / st->codecpar->channels);
193  return AVERROR_INVALIDDATA;
194  }
195 
196  switch (((st->codecpar->sample_rate/1000) << 8) +
197  read_bitrate/st->codecpar->channels) {
198  case (11<<8) + 8 :
199  case (8 <<8) + 8 :
200  case (11<<8) + 10:
201  case (22<<8) + 32:
202  size = 512;
203  break;
204  case (16<<8) + 16:
205  case (22<<8) + 20:
206  case (22<<8) + 24:
207  size = 1024;
208  break;
209  case (44<<8) + 40:
210  case (44<<8) + 48:
211  size = 2048;
212  break;
213  default:
214  av_log(s, AV_LOG_ERROR, "Mode not supported: %d Hz, %"PRId64" kb/s.\n",
216  return -1;
217  }
218  c->frame_bit_len = st->codecpar->bit_rate*size/st->codecpar->sample_rate;
219  avpriv_set_pts_info(st, 64, size, st->codecpar->sample_rate);
220 
221  /* put first 12 bytes of COMM chunk in extradata */
222  if (ff_alloc_extradata(st->codecpar, 12))
223  return AVERROR(ENOMEM);
224  memcpy(st->codecpar->extradata, comm_chunk, 12);
225 
226  ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv);
227 
228  return 0;
229 }
230 
232 {
233  VqfContext *c = s->priv_data;
234  int ret;
235  int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
236 
237  if (av_new_packet(pkt, size+2) < 0)
238  return AVERROR(EIO);
239 
240  pkt->pos = avio_tell(s->pb);
241  pkt->stream_index = 0;
242  pkt->duration = 1;
243 
244  pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
245  pkt->data[1] = c->last_frame_bits;
246  ret = avio_read(s->pb, pkt->data+2, size);
247 
248  if (ret != size) {
249  av_packet_unref(pkt);
250  return AVERROR(EIO);
251  }
252 
253  c->last_frame_bits = pkt->data[size+1];
254  c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits;
255 
256  return size+2;
257 }
258 
260  int stream_index, int64_t timestamp, int flags)
261 {
262  VqfContext *c = s->priv_data;
263  AVStream *st;
264  int64_t ret;
265  int64_t pos;
266 
267  st = s->streams[stream_index];
268  pos = av_rescale_rnd(timestamp * st->codecpar->bit_rate,
269  st->time_base.num,
270  st->time_base.den * (int64_t)c->frame_bit_len,
271  (flags & AVSEEK_FLAG_BACKWARD) ?
273  pos *= c->frame_bit_len;
274 
275  st->cur_dts = av_rescale(pos, st->time_base.den,
276  st->codecpar->bit_rate * (int64_t)st->time_base.num);
277 
278  if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->internal->data_offset, SEEK_SET)) < 0)
279  return ret;
280 
281  c->remaining_bits = -7 - ((pos-7)&7);
282  return 0;
283 }
284 
286  .name = "vqf",
287  .long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
288  .priv_data_size = sizeof(VqfContext),
293  .extensions = "vqf,vql,vqe",
294 };
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2511
static int vqf_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: vqf.c:259
#define NULL
Definition: coverity.c:32
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
void ff_metadata_conv_ctx(AVFormatContext *ctx, const AVMetadataConv *d_conv, const AVMetadataConv *s_conv)
Definition: metadata.c:59
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1497
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:4882
int64_t data_offset
offset of the first packet
Definition: internal.h:82
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3953
int num
Numerator.
Definition: rational.h:59
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1811
int remaining_bits
Definition: vqf.c:32
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
Definition: vqf.c:29
const char * key
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1358
int64_t cur_dts
Definition: avformat.h:1084
Public dictionary API.
int frame_bit_len
Definition: vqf.c:30
uint8_t
Round toward +infinity.
Definition: mathematics.h:83
#define av_malloc(s)
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:801
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1495
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:4455
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:87
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
uint8_t * data
Definition: avcodec.h:1477
uint32_t tag
Definition: movenc.c:1496
ptrdiff_t size
Definition: opengl_enc.c:100
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:648
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3982
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
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1598
static int vqf_probe(const AVProbeData *probe_packet)
Definition: vqf.c:35
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:770
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3949
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
AVInputFormat ff_vqf_demuxer
Definition: vqf.c:285
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:3287
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
#define FFMIN(a, b)
Definition: common.h:96
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
uint8_t last_frame_bits
Definition: vqf.c:31
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
#define s(width, name)
Definition: cbs_vp9.c:257
static int vqf_read_header(AVFormatContext *s)
Definition: vqf.c:92
static const AVMetadataConv vqf_metadata_conv[]
Definition: vqf.c:70
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd)
Rescale a 64-bit integer with specified rounding.
Definition: mathematics.c:58
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
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vqf.c:231
void * buf
Definition: avisynth_c.h:766
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:456
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
Round toward -infinity.
Definition: mathematics.h:82
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int sample_rate
Audio only.
Definition: avcodec.h:4063
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
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
int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, int flags)
Convenience wrapper for av_dict_set that converts the value to a string and stores it...
Definition: dict.c:147
int den
Denominator.
Definition: rational.h:60
int len
void * priv_data
Format private data.
Definition: avformat.h:1386
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3967
int channels
Audio only.
Definition: avcodec.h:4059
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
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:358
int stream_index
Definition: avcodec.h:1479
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:910
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 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:1454
static void add_metadata(AVFormatContext *s, uint32_t tag, unsigned int tag_len, unsigned int remaining)
Definition: vqf.c:52
#define AV_WL32(p, v)
Definition: intreadwrite.h:426