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wvdec.c
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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 };
44 
45 static const int wv_rates[16] = {
46  6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
47  32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
48 };
49 
50 typedef struct {
51  uint8_t block_header[WV_HEADER_SIZE];
53  int rate, chan, bpp;
54  uint32_t chmask;
57  int64_t pos;
58 
59  int64_t apetag_start;
60 } WVContext;
61 
62 static int wv_probe(AVProbeData *p)
63 {
64  /* check file header */
65  if (p->buf_size <= 32)
66  return 0;
67  if (AV_RL32(&p->buf[0]) == MKTAG('w', 'v', 'p', 'k') &&
68  AV_RL32(&p->buf[4]) >= 24 &&
69  AV_RL32(&p->buf[4]) <= WV_BLOCK_LIMIT &&
70  AV_RL16(&p->buf[8]) >= 0x402 &&
71  AV_RL16(&p->buf[8]) <= 0x410)
72  return AVPROBE_SCORE_MAX;
73  else
74  return 0;
75 }
76 
78 {
79  WVContext *wc = ctx->priv_data;
80  int ret;
81  int rate, bpp, chan;
82  uint32_t chmask, flags;
83 
84  wc->pos = avio_tell(pb);
85 
86  /* don't return bogus packets with the ape tag data */
87  if (wc->apetag_start && wc->pos >= wc->apetag_start)
88  return AVERROR_EOF;
89 
90  ret = avio_read(pb, wc->block_header, WV_HEADER_SIZE);
91  if (ret != WV_HEADER_SIZE)
92  return (ret < 0) ? ret : AVERROR_EOF;
93 
94  ret = ff_wv_parse_header(&wc->header, wc->block_header);
95  if (ret < 0) {
96  av_log(ctx, AV_LOG_ERROR, "Invalid block header.\n");
97  return ret;
98  }
99 
100  if (wc->header.version < 0x402 || wc->header.version > 0x410) {
101  av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", wc->header.version);
102  return AVERROR_PATCHWELCOME;
103  }
104 
105  /* Blocks with zero samples don't contain actual audio information
106  * and should be ignored */
107  if (!wc->header.samples)
108  return 0;
109  // parse flags
110  flags = wc->header.flags;
111  bpp = ((flags & 3) + 1) << 3;
112  chan = 1 + !(flags & WV_MONO);
113  chmask = flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
114  rate = wv_rates[(flags >> 23) & 0xF];
115  wc->multichannel = !(wc->header.initial && wc->header.final);
116  if (wc->multichannel) {
117  chan = wc->chan;
118  chmask = wc->chmask;
119  }
120  if ((rate == -1 || !chan) && !wc->block_parsed) {
121  int64_t block_end = avio_tell(pb) + wc->header.blocksize;
122  if (!pb->seekable) {
123  av_log(ctx, AV_LOG_ERROR,
124  "Cannot determine additional parameters\n");
125  return AVERROR_INVALIDDATA;
126  }
127  while (avio_tell(pb) < block_end) {
128  int id, size;
129  id = avio_r8(pb);
130  size = (id & 0x80) ? avio_rl24(pb) : avio_r8(pb);
131  size <<= 1;
132  if (id & 0x40)
133  size--;
134  switch (id & 0x3F) {
135  case 0xD:
136  if (size <= 1) {
137  av_log(ctx, AV_LOG_ERROR,
138  "Insufficient channel information\n");
139  return AVERROR_INVALIDDATA;
140  }
141  chan = avio_r8(pb);
142  switch (size - 2) {
143  case 0:
144  chmask = avio_r8(pb);
145  break;
146  case 1:
147  chmask = avio_rl16(pb);
148  break;
149  case 2:
150  chmask = avio_rl24(pb);
151  break;
152  case 3:
153  chmask = avio_rl32(pb);
154  break;
155  case 5:
156  avio_skip(pb, 1);
157  chan |= (avio_r8(pb) & 0xF) << 8;
158  chmask = avio_rl24(pb);
159  break;
160  default:
161  av_log(ctx, AV_LOG_ERROR,
162  "Invalid channel info size %d\n", size);
163  return AVERROR_INVALIDDATA;
164  }
165  break;
166  case 0x27:
167  rate = avio_rl24(pb);
168  break;
169  default:
170  avio_skip(pb, size);
171  }
172  if (id & 0x40)
173  avio_skip(pb, 1);
174  }
175  if (rate == -1) {
176  av_log(ctx, AV_LOG_ERROR,
177  "Cannot determine custom sampling rate\n");
178  return AVERROR_INVALIDDATA;
179  }
180  avio_seek(pb, block_end - wc->header.blocksize, SEEK_SET);
181  }
182  if (!wc->bpp)
183  wc->bpp = bpp;
184  if (!wc->chan)
185  wc->chan = chan;
186  if (!wc->chmask)
187  wc->chmask = chmask;
188  if (!wc->rate)
189  wc->rate = rate;
190 
191  if (flags && bpp != wc->bpp) {
192  av_log(ctx, AV_LOG_ERROR,
193  "Bits per sample differ, this block: %i, header block: %i\n",
194  bpp, wc->bpp);
195  return AVERROR_INVALIDDATA;
196  }
197  if (flags && !wc->multichannel && chan != wc->chan) {
198  av_log(ctx, AV_LOG_ERROR,
199  "Channels differ, this block: %i, header block: %i\n",
200  chan, wc->chan);
201  return AVERROR_INVALIDDATA;
202  }
203  if (flags && rate != -1 && rate != wc->rate) {
204  av_log(ctx, AV_LOG_ERROR,
205  "Sampling rate differ, this block: %i, header block: %i\n",
206  rate, wc->rate);
207  return AVERROR_INVALIDDATA;
208  }
209  return 0;
210 }
211 
213 {
214  AVIOContext *pb = s->pb;
215  WVContext *wc = s->priv_data;
216  AVStream *st;
217  int ret;
218 
219  wc->block_parsed = 0;
220  for (;;) {
221  if ((ret = wv_read_block_header(s, pb)) < 0)
222  return ret;
223  if (!wc->header.samples)
224  avio_skip(pb, wc->header.blocksize);
225  else
226  break;
227  }
228 
229  /* now we are ready: build format streams */
230  st = avformat_new_stream(s, NULL);
231  if (!st)
232  return AVERROR(ENOMEM);
235  st->codec->channels = wc->chan;
236  st->codec->channel_layout = wc->chmask;
237  st->codec->sample_rate = wc->rate;
238  st->codec->bits_per_coded_sample = wc->bpp;
239  avpriv_set_pts_info(st, 64, 1, wc->rate);
240  st->start_time = 0;
241  if (wc->header.total_samples != 0xFFFFFFFFu)
242  st->duration = wc->header.total_samples;
243 
244  if (s->pb->seekable) {
245  int64_t cur = avio_tell(s->pb);
247  if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
248  ff_id3v1_read(s);
249  avio_seek(s->pb, cur, SEEK_SET);
250  }
251 
252  return 0;
253 }
254 
256 {
257  WVContext *wc = s->priv_data;
258  int ret;
259  int off;
260  int64_t pos;
261  uint32_t block_samples;
262 
263  if (url_feof(s->pb))
264  return AVERROR_EOF;
265  if (wc->block_parsed) {
266  if ((ret = wv_read_block_header(s, s->pb)) < 0)
267  return ret;
268  }
269 
270  pos = wc->pos;
271  if (av_new_packet(pkt, wc->header.blocksize + WV_HEADER_SIZE) < 0)
272  return AVERROR(ENOMEM);
273  memcpy(pkt->data, wc->block_header, WV_HEADER_SIZE);
274  ret = avio_read(s->pb, pkt->data + WV_HEADER_SIZE, wc->header.blocksize);
275  if (ret != wc->header.blocksize) {
276  av_free_packet(pkt);
277  return AVERROR(EIO);
278  }
279  while (!(wc->header.flags & WV_FLAG_FINAL_BLOCK)) {
280  if ((ret = wv_read_block_header(s, s->pb)) < 0) {
281  av_free_packet(pkt);
282  return ret;
283  }
284 
285  off = pkt->size;
286  if ((ret = av_grow_packet(pkt, WV_HEADER_SIZE + wc->header.blocksize)) < 0) {
287  av_free_packet(pkt);
288  return ret;
289  }
290  memcpy(pkt->data + off, wc->block_header, WV_HEADER_SIZE);
291 
292  ret = avio_read(s->pb, pkt->data + off + WV_HEADER_SIZE, wc->header.blocksize);
293  if (ret != wc->header.blocksize) {
294  av_free_packet(pkt);
295  return (ret < 0) ? ret : AVERROR_EOF;
296  }
297  }
298  pkt->stream_index = 0;
299  wc->block_parsed = 1;
300  pkt->pts = wc->header.block_idx;
301  block_samples = wc->header.samples;
302  if (block_samples > INT32_MAX)
304  "Too many samples in block: %"PRIu32"\n", block_samples);
305  else
306  pkt->duration = block_samples;
307 
308  av_add_index_entry(s->streams[0], pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
309  return 0;
310 }
311 
312 static int wv_read_seek(AVFormatContext *s, int stream_index,
313  int64_t timestamp, int flags)
314 {
315  AVStream *st = s->streams[stream_index];
316  WVContext *wc = s->priv_data;
317  AVPacket pkt1, *pkt = &pkt1;
318  int ret;
319  int index = av_index_search_timestamp(st, timestamp, flags);
320  int64_t pos, pts;
321 
322  /* if found, seek there */
323  if (index >= 0 &&
324  timestamp <= st->index_entries[st->nb_index_entries - 1].timestamp) {
325  wc->block_parsed = 1;
326  avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET);
327  return 0;
328  }
329  /* if timestamp is out of bounds, return error */
330  if (timestamp < 0 || timestamp >= s->duration)
331  return AVERROR(EINVAL);
332 
333  pos = avio_tell(s->pb);
334  do {
335  ret = av_read_frame(s, pkt);
336  if (ret < 0) {
337  avio_seek(s->pb, pos, SEEK_SET);
338  return ret;
339  }
340  pts = pkt->pts;
341  av_free_packet(pkt);
342  } while(pts < timestamp);
343  return 0;
344 }
345 
347  .name = "wv",
348  .long_name = NULL_IF_CONFIG_SMALL("WavPack"),
349  .priv_data_size = sizeof(WVContext),
350  .read_probe = wv_probe,
354 };