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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(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 
47 }
48 
49 static void add_metadata(AVFormatContext *s, uint32_t tag,
50  unsigned int tag_len, unsigned int remaining)
51 {
52  int len = FFMIN(tag_len, remaining);
53  char *buf, key[5] = {0};
54 
55  if (len == UINT_MAX)
56  return;
57 
58  buf = av_malloc(len+1);
59  if (!buf)
60  return;
61  avio_read(s->pb, buf, len);
62  buf[len] = 0;
63  AV_WL32(key, tag);
65 }
66 
68  { "(c) ", "copyright" },
69  { "ARNG", "arranger" },
70  { "AUTH", "author" },
71  { "BAND", "band" },
72  { "CDCT", "conductor" },
73  { "COMT", "comment" },
74  { "FILE", "filename" },
75  { "GENR", "genre" },
76  { "LABL", "publisher" },
77  { "MUSC", "composer" },
78  { "NAME", "title" },
79  { "NOTE", "note" },
80  { "PROD", "producer" },
81  { "PRSN", "personnel" },
82  { "REMX", "remixer" },
83  { "SING", "singer" },
84  { "TRCK", "track" },
85  { "WORD", "words" },
86  { 0 },
87 };
88 
90 {
91  VqfContext *c = s->priv_data;
92  AVStream *st = avformat_new_stream(s, NULL);
93  int chunk_tag;
94  int rate_flag = -1;
95  int header_size;
96  int read_bitrate = 0;
97  int size;
98  uint8_t comm_chunk[12];
99 
100  if (!st)
101  return AVERROR(ENOMEM);
102 
103  avio_skip(s->pb, 12);
104 
105  header_size = avio_rb32(s->pb);
106 
109  st->start_time = 0;
110 
111  do {
112  int len;
113  chunk_tag = avio_rl32(s->pb);
114 
115  if (chunk_tag == MKTAG('D','A','T','A'))
116  break;
117 
118  len = avio_rb32(s->pb);
119 
120  if ((unsigned) len > INT_MAX/2) {
121  av_log(s, AV_LOG_ERROR, "Malformed header\n");
122  return -1;
123  }
124 
125  header_size -= 8;
126 
127  switch(chunk_tag){
128  case MKTAG('C','O','M','M'):
129  avio_read(s->pb, comm_chunk, 12);
130  st->codec->channels = AV_RB32(comm_chunk ) + 1;
131  read_bitrate = AV_RB32(comm_chunk + 4);
132  rate_flag = AV_RB32(comm_chunk + 8);
133  avio_skip(s->pb, len-12);
134 
135  if (st->codec->channels <= 0) {
136  av_log(s, AV_LOG_ERROR, "Invalid number of channels\n");
137  return AVERROR_INVALIDDATA;
138  }
139 
140  st->codec->bit_rate = read_bitrate*1000;
141  break;
142  case MKTAG('D','S','I','Z'): // size of compressed data
143  {
144  char buf[8] = {0};
145  int size = avio_rb32(s->pb);
146 
147  snprintf(buf, sizeof(buf), "%d", size);
148  av_dict_set(&s->metadata, "size", buf, 0);
149  }
150  break;
151  case MKTAG('Y','E','A','R'): // recording date
152  case MKTAG('E','N','C','D'): // compression date
153  case MKTAG('E','X','T','R'): // reserved
154  case MKTAG('_','Y','M','H'): // reserved
155  case MKTAG('_','N','T','T'): // reserved
156  case MKTAG('_','I','D','3'): // reserved for ID3 tags
157  avio_skip(s->pb, FFMIN(len, header_size));
158  break;
159  default:
160  add_metadata(s, chunk_tag, len, header_size);
161  break;
162  }
163 
164  header_size -= len;
165 
166  } while (header_size >= 0 && !url_feof(s->pb));
167 
168  switch (rate_flag) {
169  case -1:
170  av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
171  return -1;
172  case 44:
173  st->codec->sample_rate = 44100;
174  break;
175  case 22:
176  st->codec->sample_rate = 22050;
177  break;
178  case 11:
179  st->codec->sample_rate = 11025;
180  break;
181  default:
182  if (rate_flag < 8 || rate_flag > 44) {
183  av_log(s, AV_LOG_ERROR, "Invalid rate flag %d\n", rate_flag);
184  return AVERROR_INVALIDDATA;
185  }
186  st->codec->sample_rate = rate_flag*1000;
187  break;
188  }
189 
190  if (read_bitrate / st->codec->channels < 8 ||
191  read_bitrate / st->codec->channels > 48) {
192  av_log(s, AV_LOG_ERROR, "Invalid bitrate per channel %d\n",
193  read_bitrate / st->codec->channels);
194  return AVERROR_INVALIDDATA;
195  }
196 
197  switch (((st->codec->sample_rate/1000) << 8) +
198  read_bitrate/st->codec->channels) {
199  case (11<<8) + 8 :
200  case (8 <<8) + 8 :
201  case (11<<8) + 10:
202  case (22<<8) + 32:
203  size = 512;
204  break;
205  case (16<<8) + 16:
206  case (22<<8) + 20:
207  case (22<<8) + 24:
208  size = 1024;
209  break;
210  case (44<<8) + 40:
211  case (44<<8) + 48:
212  size = 2048;
213  break;
214  default:
215  av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n",
216  st->codec->sample_rate, st->codec->bit_rate);
217  return -1;
218  }
219  c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
220  avpriv_set_pts_info(st, 64, size, st->codec->sample_rate);
221 
222  /* put first 12 bytes of COMM chunk in extradata */
223  if (ff_alloc_extradata(st->codec, 12))
224  return AVERROR(ENOMEM);
225  memcpy(st->codec->extradata, comm_chunk, 12);
226 
227  ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv);
228 
229  return 0;
230 }
231 
233 {
234  VqfContext *c = s->priv_data;
235  int ret;
236  int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
237 
238  if (av_new_packet(pkt, size+2) < 0)
239  return AVERROR(EIO);
240 
241  pkt->pos = avio_tell(s->pb);
242  pkt->stream_index = 0;
243  pkt->duration = 1;
244 
245  pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
246  pkt->data[1] = c->last_frame_bits;
247  ret = avio_read(s->pb, pkt->data+2, size);
248 
249  if (ret<=0) {
250  av_free_packet(pkt);
251  return AVERROR(EIO);
252  }
253 
254  c->last_frame_bits = pkt->data[size+1];
255  c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits;
256 
257  return size+2;
258 }
259 
261  int stream_index, int64_t timestamp, int flags)
262 {
263  VqfContext *c = s->priv_data;
264  AVStream *st;
265  int ret;
266  int64_t pos;
267 
268  st = s->streams[stream_index];
269  pos = av_rescale_rnd(timestamp * st->codec->bit_rate,
270  st->time_base.num,
271  st->time_base.den * (int64_t)c->frame_bit_len,
272  (flags & AVSEEK_FLAG_BACKWARD) ?
274  pos *= c->frame_bit_len;
275 
276  st->cur_dts = av_rescale(pos, st->time_base.den,
277  st->codec->bit_rate * (int64_t)st->time_base.num);
278 
279  if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0)
280  return ret;
281 
282  c->remaining_bits = -7 - ((pos-7)&7);
283  return 0;
284 }
285 
287  .name = "vqf",
288  .long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
289  .priv_data_size = sizeof(VqfContext),
294  .extensions = "vqf,vql,vqe",
295 };