FFmpeg  2.8.17
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Modules Pages
wvdec.c
Go to the documentation of this file.
1 /*
2  * WavPack demuxer
3  * Copyright (c) 2006,2011 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 #include "libavutil/dict.h"
25 #include "avformat.h"
26 #include "internal.h"
27 #include "apetag.h"
28 #include "id3v1.h"
29 #include "wv.h"
30 
31 enum WV_FLAGS {
32  WV_MONO = 0x0004,
33  WV_HYBRID = 0x0008,
34  WV_JOINT = 0x0010,
35  WV_CROSSD = 0x0020,
36  WV_HSHAPE = 0x0040,
37  WV_FLOAT = 0x0080,
38  WV_INT32 = 0x0100,
39  WV_HBR = 0x0200,
40  WV_HBAL = 0x0400,
41  WV_MCINIT = 0x0800,
42  WV_MCEND = 0x1000,
43  WV_DSD = 0x80000000,
44 };
45 
46 static const int wv_rates[16] = {
47  6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
48  32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
49 };
50 
51 typedef struct WVContext {
54  int rate, chan, bpp;
55  uint32_t chmask;
58  int64_t pos;
59 
60  int64_t apetag_start;
61 } WVContext;
62 
63 static int wv_probe(AVProbeData *p)
64 {
65  /* check file header */
66  if (p->buf_size <= 32)
67  return 0;
68  if (AV_RL32(&p->buf[0]) == MKTAG('w', 'v', 'p', 'k') &&
69  AV_RL32(&p->buf[4]) >= 24 &&
70  AV_RL32(&p->buf[4]) <= WV_BLOCK_LIMIT &&
71  AV_RL16(&p->buf[8]) >= 0x402 &&
72  AV_RL16(&p->buf[8]) <= 0x410)
73  return AVPROBE_SCORE_MAX;
74  else
75  return 0;
76 }
77 
79 {
80  WVContext *wc = ctx->priv_data;
81  int ret;
82  int rate, bpp, chan;
83  uint32_t chmask, flags;
84 
85  wc->pos = avio_tell(pb);
86 
87  /* don't return bogus packets with the ape tag data */
88  if (wc->apetag_start && wc->pos >= wc->apetag_start)
89  return AVERROR_EOF;
90 
91  ret = avio_read(pb, wc->block_header, WV_HEADER_SIZE);
92  if (ret != WV_HEADER_SIZE)
93  return (ret < 0) ? ret : AVERROR_EOF;
94 
95  ret = ff_wv_parse_header(&wc->header, wc->block_header);
96  if (ret < 0) {
97  av_log(ctx, AV_LOG_ERROR, "Invalid block header.\n");
98  return ret;
99  }
100 
101  if (wc->header.flags & WV_DSD) {
102  avpriv_report_missing_feature(ctx, "WV DSD");
103  return AVERROR_PATCHWELCOME;
104  }
105 
106  if (wc->header.version < 0x402 || wc->header.version > 0x410) {
107  av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", wc->header.version);
108  return AVERROR_PATCHWELCOME;
109  }
110 
111  /* Blocks with zero samples don't contain actual audio information
112  * and should be ignored */
113  if (!wc->header.samples)
114  return 0;
115  // parse flags
116  flags = wc->header.flags;
117  bpp = ((flags & 3) + 1) << 3;
118  chan = 1 + !(flags & WV_MONO);
119  chmask = flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
120  rate = wv_rates[(flags >> 23) & 0xF];
121  wc->multichannel = !(wc->header.initial && wc->header.final);
122  if (wc->multichannel) {
123  chan = wc->chan;
124  chmask = wc->chmask;
125  }
126  if ((rate == -1 || !chan) && !wc->block_parsed) {
127  int64_t block_end = avio_tell(pb) + wc->header.blocksize;
128  if (!pb->seekable) {
129  av_log(ctx, AV_LOG_ERROR,
130  "Cannot determine additional parameters\n");
131  return AVERROR_INVALIDDATA;
132  }
133  while (avio_tell(pb) < block_end && !avio_feof(pb)) {
134  int id, size;
135  id = avio_r8(pb);
136  size = (id & 0x80) ? avio_rl24(pb) : avio_r8(pb);
137  size <<= 1;
138  if (id & 0x40)
139  size--;
140  switch (id & 0x3F) {
141  case 0xD:
142  if (size <= 1) {
143  av_log(ctx, AV_LOG_ERROR,
144  "Insufficient channel information\n");
145  return AVERROR_INVALIDDATA;
146  }
147  chan = avio_r8(pb);
148  switch (size - 2) {
149  case 0:
150  chmask = avio_r8(pb);
151  break;
152  case 1:
153  chmask = avio_rl16(pb);
154  break;
155  case 2:
156  chmask = avio_rl24(pb);
157  break;
158  case 3:
159  chmask = avio_rl32(pb);
160  break;
161  case 5:
162  avio_skip(pb, 1);
163  chan |= (avio_r8(pb) & 0xF) << 8;
164  chmask = avio_rl24(pb);
165  break;
166  default:
167  av_log(ctx, AV_LOG_ERROR,
168  "Invalid channel info size %d\n", size);
169  return AVERROR_INVALIDDATA;
170  }
171  break;
172  case 0x27:
173  rate = avio_rl24(pb);
174  break;
175  default:
176  avio_skip(pb, size);
177  }
178  if (id & 0x40)
179  avio_skip(pb, 1);
180  }
181  if (rate == -1) {
182  av_log(ctx, AV_LOG_ERROR,
183  "Cannot determine custom sampling rate\n");
184  return AVERROR_INVALIDDATA;
185  }
186  avio_seek(pb, block_end - wc->header.blocksize, SEEK_SET);
187  }
188  if (!wc->bpp)
189  wc->bpp = bpp;
190  if (!wc->chan)
191  wc->chan = chan;
192  if (!wc->chmask)
193  wc->chmask = chmask;
194  if (!wc->rate)
195  wc->rate = rate;
196 
197  if (flags && bpp != wc->bpp) {
198  av_log(ctx, AV_LOG_ERROR,
199  "Bits per sample differ, this block: %i, header block: %i\n",
200  bpp, wc->bpp);
201  return AVERROR_INVALIDDATA;
202  }
203  if (flags && !wc->multichannel && chan != wc->chan) {
204  av_log(ctx, AV_LOG_ERROR,
205  "Channels differ, this block: %i, header block: %i\n",
206  chan, wc->chan);
207  return AVERROR_INVALIDDATA;
208  }
209  if (flags && rate != -1 && rate != wc->rate) {
210  av_log(ctx, AV_LOG_ERROR,
211  "Sampling rate differ, this block: %i, header block: %i\n",
212  rate, wc->rate);
213  return AVERROR_INVALIDDATA;
214  }
215  return 0;
216 }
217 
219 {
220  AVIOContext *pb = s->pb;
221  WVContext *wc = s->priv_data;
222  AVStream *st;
223  int ret;
224 
225  wc->block_parsed = 0;
226  for (;;) {
227  if ((ret = wv_read_block_header(s, pb)) < 0)
228  return ret;
229  if (!wc->header.samples)
230  avio_skip(pb, wc->header.blocksize);
231  else
232  break;
233  }
234 
235  /* now we are ready: build format streams */
236  st = avformat_new_stream(s, NULL);
237  if (!st)
238  return AVERROR(ENOMEM);
241  st->codec->channels = wc->chan;
242  st->codec->channel_layout = wc->chmask;
243  st->codec->sample_rate = wc->rate;
244  st->codec->bits_per_coded_sample = wc->bpp;
245  avpriv_set_pts_info(st, 64, 1, wc->rate);
246  st->start_time = 0;
247  if (wc->header.total_samples != 0xFFFFFFFFu)
248  st->duration = wc->header.total_samples;
249 
250  if (s->pb->seekable) {
251  int64_t cur = avio_tell(s->pb);
254  ff_id3v1_read(s);
255  avio_seek(s->pb, cur, SEEK_SET);
256  }
257 
258  return 0;
259 }
260 
262 {
263  WVContext *wc = s->priv_data;
264  int ret;
265  int off;
266  int64_t pos;
267  uint32_t block_samples;
268 
269  if (avio_feof(s->pb))
270  return AVERROR_EOF;
271  if (wc->block_parsed) {
272  if ((ret = wv_read_block_header(s, s->pb)) < 0)
273  return ret;
274  }
275 
276  pos = wc->pos;
277  if (av_new_packet(pkt, wc->header.blocksize + WV_HEADER_SIZE) < 0)
278  return AVERROR(ENOMEM);
279  memcpy(pkt->data, wc->block_header, WV_HEADER_SIZE);
280  ret = avio_read(s->pb, pkt->data + WV_HEADER_SIZE, wc->header.blocksize);
281  if (ret != wc->header.blocksize) {
282  av_free_packet(pkt);
283  return AVERROR(EIO);
284  }
285  while (!(wc->header.flags & WV_FLAG_FINAL_BLOCK)) {
286  if ((ret = wv_read_block_header(s, s->pb)) < 0) {
287  av_free_packet(pkt);
288  return ret;
289  }
290 
291  off = pkt->size;
292  if ((ret = av_grow_packet(pkt, WV_HEADER_SIZE + wc->header.blocksize)) < 0) {
293  av_free_packet(pkt);
294  return ret;
295  }
296  memcpy(pkt->data + off, wc->block_header, WV_HEADER_SIZE);
297 
298  ret = avio_read(s->pb, pkt->data + off + WV_HEADER_SIZE, wc->header.blocksize);
299  if (ret != wc->header.blocksize) {
300  av_free_packet(pkt);
301  return (ret < 0) ? ret : AVERROR_EOF;
302  }
303  }
304  pkt->stream_index = 0;
305  pkt->pos = pos;
306  wc->block_parsed = 1;
307  pkt->pts = wc->header.block_idx;
308  block_samples = wc->header.samples;
309  if (block_samples > INT32_MAX)
311  "Too many samples in block: %"PRIu32"\n", block_samples);
312  else
313  pkt->duration = block_samples;
314 
315  return 0;
316 }
317 
319  .name = "wv",
320  .long_name = NULL_IF_CONFIG_SMALL("WavPack"),
321  .priv_data_size = sizeof(WVContext),
322  .read_probe = wv_probe,
326 };
int64_t pos
Definition: wvdec.c:58
#define NULL
Definition: coverity.c:32
int block_parsed
Definition: wvdec.c:57
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
uint8_t block_header[WV_HEADER_SIZE]
Definition: wvdec.c:52
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:284
uint32_t samples
Definition: wv.h:39
int initial
Definition: wv.h:43
enum AVCodecID id
Definition: mxfenc.c:102
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1458
int rate
Definition: wvdec.c:54
Definition: wvdec.c:32
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:4098
void ff_id3v1_read(AVFormatContext *s)
Read an ID3v1 tag.
Definition: id3v1.c:235
int size
Definition: avcodec.h:1434
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:204
#define WV_BLOCK_LIMIT
Definition: wv.h:32
static int wv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: wvdec.c:261
#define AV_RL16
Definition: intreadwrite.h:42
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:279
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
int multichannel
Definition: wvdec.c:56
Format I/O context.
Definition: avformat.h:1285
Public dictionary API.
static int wv_probe(AVProbeData *p)
Definition: wvdec.c:63
uint8_t
uint32_t flags
Definition: wv.h:40
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3761
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:39
uint8_t * data
Definition: avcodec.h:1433
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define WV_HEADER_SIZE
Definition: wavpack.h:30
ptrdiff_t size
Definition: opengl_enc.c:101
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:390
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:3006
Definition: wv.h:34
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1451
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:542
WV_FLAGS
Definition: wvdec.c:31
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:84
#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:1497
AVInputFormat ff_wv_demuxer
Definition: wvdec.c:318
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:663
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:178
int final
Definition: wv.h:43
int64_t ff_ape_parse_tag(AVFormatContext *s)
Read and parse an APE tag.
Definition: apetag.c:118
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2333
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:533
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:873
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:463
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:462
uint16_t version
Definition: wv.h:36
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:160
audio channel layout utility functions
Definition: wvdec.c:39
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
Definition: wvdec.c:43
static const int wv_rates[16]
Definition: wvdec.c:46
int ff_wv_parse_header(WvHeader *wv, const uint8_t *data)
Parse a WavPack block header.
Definition: wv.c:29
int bpp
Definition: wvdec.c:54
int64_t apetag_start
Definition: wvdec.c:60
#define AV_RL32
Definition: intreadwrite.h:146
WvHeader header
Definition: wvdec.c:53
Definition: wvdec.c:34
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:634
Stream structure.
Definition: avformat.h:854
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
enum AVMediaType codec_type
Definition: avcodec.h:1520
enum AVCodecID codec_id
Definition: avcodec.h:1529
int sample_rate
samples per second
Definition: avcodec.h:2272
AVIOContext * pb
I/O context.
Definition: avformat.h:1327
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:485
uint32_t total_samples
Definition: wv.h:37
int chan
Definition: wvdec.c:54
uint32_t chmask
Definition: wvdec.c:55
This structure contains the data a format has to probe a file.
Definition: avformat.h:460
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint32_t block_idx
Definition: wv.h:38
static int flags
Definition: cpu.c:47
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:913
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:472
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:647
Main libavformat public API header.
Definition: wvdec.c:40
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:906
static int wv_read_header(AVFormatContext *s)
Definition: wvdec.c:218
int av_grow_packet(AVPacket *pkt, int grow_by)
Increase packet size, correctly zeroing padding.
Definition: avpacket.c:112
Definition: wvdec.c:38
Definition: wvdec.c:37
int channels
number of audio channels
Definition: avcodec.h:2273
void * priv_data
Format private data.
Definition: avformat.h:1313
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:640
#define AV_DICT_IGNORE_SUFFIX
Return first entry in a dictionary whose first part corresponds to the search key, ignoring the suffix of the found key string.
Definition: dict.h:72
Definition: wvdec.c:42
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:303
unsigned int avio_rl24(AVIOContext *s)
Definition: aviobuf.c:655
int stream_index
Definition: avcodec.h:1435
static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
Definition: wvdec.c:78
#define AV_CH_LAYOUT_MONO
#define MKTAG(a, b, c, d)
Definition: common.h:341
This structure stores compressed data.
Definition: avcodec.h:1410
#define WV_FLAG_FINAL_BLOCK
Definition: wv.h:29
uint32_t blocksize
Definition: wv.h:35
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1426