FFmpeg: libavformat/vqf.c Source File

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 {
30   int frame_bit_len;
31   uint8_t last_frame_bits;
32   int remaining_bits;
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 
49  return AVPROBE_SCORE_EXTENSION;
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);
67  av_dict_set(&s->metadata, key, buf, AV_DICT_DONT_STRDUP_VAL);
68 }
69 
70  static const AVMetadataConv vqf_metadata_conv[] = {
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 
92  static int vqf_read_header(AVFormatContext *s)
93 {
94  VqfContext *c = s->priv_data;
95  AVStream *st = avformat_new_stream(s, NULL);
96  int chunk_tag;
97  int rate_flag = -1;
98  int header_size;
99  int read_bitrate = 0;
100  int size, ret;
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 
110  if (header_size < 0)
111  return AVERROR_INVALIDDATA;
112 
113  st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
114  st->codecpar->codec_id = AV_CODEC_ID_TWINVQ;
115  st->start_time = 0;
116 
117  do {
118  int len;
119  chunk_tag = avio_rl32(s->pb);
120 
121  if (chunk_tag == MKTAG('D','A','T','A'))
122  break;
123 
124  len = avio_rb32(s->pb);
125 
126  if ((unsigned) len > INT_MAX/2 || header_size < 8) {
127  av_log(s, AV_LOG_ERROR, "Malformed header\n");
128  return -1;
129  }
130 
131  header_size -= 8;
132 
133  switch(chunk_tag){
134  case MKTAG('C','O','M','M'):
135  if (len < 12)
136  return AVERROR_INVALIDDATA;
137 
138  avio_read(s->pb, comm_chunk, 12);
139  st->codecpar->ch_layout.nb_channels = AV_RB32(comm_chunk) + 1;
140  read_bitrate = AV_RB32(comm_chunk + 4);
141  rate_flag = AV_RB32(comm_chunk + 8);
142  avio_skip(s->pb, len-12);
143 
144  if (st->codecpar->ch_layout.nb_channels <= 0) {
145  av_log(s, AV_LOG_ERROR, "Invalid number of channels\n");
146  return AVERROR_INVALIDDATA;
147  }
148 
149  st->codecpar->bit_rate = (int64_t)read_bitrate * 1000;
150  break;
151  case MKTAG('D','S','I','Z'): // size of compressed data
152  {
153  av_dict_set_int(&s->metadata, "size", avio_rb32(s->pb), 0);
154  }
155  break;
156  case MKTAG('Y','E','A','R'): // recording date
157  case MKTAG('E','N','C','D'): // compression date
158  case MKTAG('E','X','T','R'): // reserved
159  case MKTAG('_','Y','M','H'): // reserved
160  case MKTAG('_','N','T','T'): // reserved
161  case MKTAG('_','I','D','3'): // reserved for ID3 tags
162  avio_skip(s->pb, FFMIN(len, header_size));
163  break;
164  default:
165  add_metadata(s, chunk_tag, len, header_size);
166  break;
167  }
168 
169  header_size -= len;
170 
171  } while (header_size >= 0 && !avio_feof(s->pb));
172 
173  switch (rate_flag) {
174  case -1:
175  av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
176  return -1;
177  case 44:
178  st->codecpar->sample_rate = 44100;
179  break;
180  case 22:
181  st->codecpar->sample_rate = 22050;
182  break;
183  case 11:
184  st->codecpar->sample_rate = 11025;
185  break;
186  default:
187  if (rate_flag < 8 || rate_flag > 44) {
188  av_log(s, AV_LOG_ERROR, "Invalid rate flag %d\n", rate_flag);
189  return AVERROR_INVALIDDATA;
190  }
191  st->codecpar->sample_rate = rate_flag*1000;
192  break;
193  }
194 
195  if (read_bitrate / st->codecpar->ch_layout.nb_channels < 8 ||
196  read_bitrate / st->codecpar->ch_layout.nb_channels > 48) {
197  av_log(s, AV_LOG_ERROR, "Invalid bitrate per channel %d\n",
198  read_bitrate / st->codecpar->ch_layout.nb_channels);
199  return AVERROR_INVALIDDATA;
200  }
201 
202  switch (((st->codecpar->sample_rate/1000) << 8) +
203  read_bitrate/st->codecpar->ch_layout.nb_channels) {
204  case (11<<8) + 8 :
205  case (8 <<8) + 8 :
206  case (11<<8) + 10:
207  case (22<<8) + 32:
208  size = 512;
209  break;
210  case (16<<8) + 16:
211  case (22<<8) + 20:
212  case (22<<8) + 24:
213  size = 1024;
214  break;
215  case (44<<8) + 40:
216  case (44<<8) + 48:
217  size = 2048;
218  break;
219  default:
220  av_log(s, AV_LOG_ERROR, "Mode not supported: %d Hz, %"PRId64" kb/s.\n",
221  st->codecpar->sample_rate, st->codecpar->bit_rate);
222  return -1;
223  }
224  c->frame_bit_len = st->codecpar->bit_rate*size/st->codecpar->sample_rate;
225  avpriv_set_pts_info(st, 64, size, st->codecpar->sample_rate);
226 
227  /* put first 12 bytes of COMM chunk in extradata */
228  if ((ret = ff_alloc_extradata(st->codecpar, 12)) < 0)
229  return ret;
230  memcpy(st->codecpar->extradata, comm_chunk, 12);
231 
232  ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv);
233 
234  return 0;
235 }
236 
237  static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
238 {
239  VqfContext *c = s->priv_data;
240  int ret;
241  int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
242 
243  if ((ret = av_new_packet(pkt, size + 2)) < 0)
244  return ret;
245 
246  pkt->pos = avio_tell(s->pb);
247  pkt->stream_index = 0;
248  pkt->duration = 1;
249 
250  pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
251  pkt->data[1] = c->last_frame_bits;
252  ret = avio_read(s->pb, pkt->data+2, size);
253 
254  if (ret != size) {
255  return AVERROR(EIO);
256  }
257 
258  c->last_frame_bits = pkt->data[size+1];
259  c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits;
260 
261  return size+2;
262 }
263 
264  static int vqf_read_seek(AVFormatContext *s,
265  int stream_index, int64_t timestamp, int flags)
266 {
267  VqfContext *c = s->priv_data;
268  AVStream *st;
269  int64_t ret;
270  int64_t pos;
271 
272  st = s->streams[stream_index];
273  pos = av_rescale_rnd(timestamp * st->codecpar->bit_rate,
274  st->time_base.num,
275  st->time_base.den * (int64_t)c->frame_bit_len,
276  (flags & AVSEEK_FLAG_BACKWARD) ?
277  AV_ROUND_DOWN : AV_ROUND_UP);
278  pos *= c->frame_bit_len;
279 
280  ffstream(st)->cur_dts = av_rescale(pos, st->time_base.den,
281  st->codecpar->bit_rate * (int64_t)st->time_base.num);
282 
283  if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + ffformatcontext(s)->data_offset, SEEK_SET)) < 0)
284  return ret;
285 
286  c->remaining_bits = -7 - ((pos-7)&7);
287  return 0;
288 }
289 
290  const AVInputFormat ff_vqf_demuxer = {
291  .name = "vqf",
292  .long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
293  .priv_data_size = sizeof(VqfContext),
294  .read_probe = vqf_probe,
295  .read_header = vqf_read_header,
296  .read_packet = vqf_read_packet,
297  .read_seek = vqf_read_seek,
298  .extensions = "vqf,vql,vqe",
299 };
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:75
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
vqf_probe
static int vqf_probe(const AVProbeData *probe_packet)
Definition: vqf.c:35
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:57
AV_WL32
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
ffformatcontext
static av_always_inline FFFormatContext * ffformatcontext(AVFormatContext *s)
Definition: internal.h:192
vqf_read_seek
static int vqf_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: vqf.c:264
add_metadata
static void add_metadata(AVFormatContext *s, uint32_t tag, unsigned int tag_len, unsigned int remaining)
Definition: vqf.c:52
VqfContext::remaining_bits
int remaining_bits
Definition: vqf.c:32
AVPacket::data
uint8_t * data
Definition: packet.h:374
VqfContext
Definition: vqf.c:29
AVMetadataConv
Definition: metadata.h:34
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:392
mathematics.h
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:300
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
ff_vqf_demuxer
const AVInputFormat ff_vqf_demuxer
Definition: vqf.c:290
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:465
VqfContext::last_frame_bits
uint8_t last_frame_bits
Definition: vqf.c:31
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:697
vqf_metadata_conv
static const AVMetadataConv vqf_metadata_conv[]
Definition: vqf.c:70
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:407
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:151
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:505
AV_ROUND_UP
@ AV_ROUND_UP
Round toward +infinity.
Definition: mathematics.h:83
AVRational::num
int num
Numerator.
Definition: rational.h:59
AV_DICT_DONT_STRDUP_VAL
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:72
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:790
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:656
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:256
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:97
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
key
const char * key
Definition: hwcontext_opencl.c:174
vqf_read_packet
static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vqf.c:237
AVFormatContext
Format I/O context.
Definition: avformat.h:1213
internal.h
ff_metadata_conv_ctx
void ff_metadata_conv_ctx(AVFormatContext *ctx, const AVMetadataConv *d_conv, const AVMetadataConv *s_conv)
Definition: metadata.c:59
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
AVSEEK_FLAG_BACKWARD
#define AVSEEK_FLAG_BACKWARD
Definition: avformat.h:2289
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:532
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:978
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:453
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:212
c
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
AVPROBE_SCORE_EXTENSION
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:463
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:177
av_rescale_rnd
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
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
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
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
vqf_read_header
static int vqf_read_header(AVFormatContext *s)
Definition: vqf.c:92
AV_ROUND_DOWN
@ AV_ROUND_DOWN
Round toward -infinity.
Definition: mathematics.h:82
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
len
int len
Definition: vorbis_enc_data.h:426
av_rescale
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
tag
uint32_t tag
Definition: movenc.c:1646
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:948
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:260
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
dict.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVRational::den
int den
Denominator.
Definition: rational.h:60
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:641
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:347
av_dict_set_int
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
VqfContext::frame_bit_len
int frame_bit_len
Definition: vqf.c:30
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
av_dict_set
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
riff.h
FFStream::cur_dts
int64_t cur_dts
Definition: internal.h:404
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:394
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:90
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:988
AV_CODEC_ID_TWINVQ
@ AV_CODEC_ID_TWINVQ
Definition: codec_id.h:470
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:238
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:375
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