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
vqf_probe(const AVProbeData * probe_packet)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
add_metadata(AVFormatContext * s,uint32_t tag,unsigned int tag_len,unsigned int remaining)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 if (len != avio_read(s->pb, buf, len))
65 return;
66 buf[len] = 0;
67 AV_WL32(key, tag);
68 av_dict_set(&s->metadata, key, buf, AV_DICT_DONT_STRDUP_VAL);
69 }
70
71 static const AVMetadataConv vqf_metadata_conv[] = {
72 { "(c) ", "copyright" },
73 { "ARNG", "arranger" },
74 { "AUTH", "author" },
75 { "BAND", "band" },
76 { "CDCT", "conductor" },
77 { "COMT", "comment" },
78 { "FILE", "filename" },
79 { "GENR", "genre" },
80 { "LABL", "publisher" },
81 { "MUSC", "composer" },
82 { "NAME", "title" },
83 { "NOTE", "note" },
84 { "PROD", "producer" },
85 { "PRSN", "personnel" },
86 { "REMX", "remixer" },
87 { "SING", "singer" },
88 { "TRCK", "track" },
89 { "WORD", "words" },
90 { 0 },
91 };
92
vqf_read_header(AVFormatContext * s)93 static int vqf_read_header(AVFormatContext *s)
94 {
95 VqfContext *c = s->priv_data;
96 AVStream *st = avformat_new_stream(s, NULL);
97 int chunk_tag;
98 int rate_flag = -1;
99 int header_size;
100 int read_bitrate = 0;
101 int size, ret;
102 uint8_t comm_chunk[12];
103
104 if (!st)
105 return AVERROR(ENOMEM);
106
107 avio_skip(s->pb, 12);
108
109 header_size = avio_rb32(s->pb);
110
111 if (header_size < 0)
112 return AVERROR_INVALIDDATA;
113
114 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
115 st->codecpar->codec_id = AV_CODEC_ID_TWINVQ;
116 st->start_time = 0;
117
118 do {
119 int len;
120 chunk_tag = avio_rl32(s->pb);
121
122 if (chunk_tag == MKTAG('D','A','T','A'))
123 break;
124
125 len = avio_rb32(s->pb);
126
127 if ((unsigned) len > INT_MAX/2 || header_size < 8) {
128 av_log(s, AV_LOG_ERROR, "Malformed header\n");
129 return -1;
130 }
131
132 header_size -= 8;
133
134 switch(chunk_tag){
135 case MKTAG('C','O','M','M'):
136 if (len < 12)
137 return AVERROR_INVALIDDATA;
138
139 avio_read(s->pb, comm_chunk, 12);
140 st->codecpar->ch_layout.nb_channels = AV_RB32(comm_chunk) + 1;
141 read_bitrate = AV_RB32(comm_chunk + 4);
142 rate_flag = AV_RB32(comm_chunk + 8);
143 avio_skip(s->pb, len-12);
144
145 if (st->codecpar->ch_layout.nb_channels <= 0) {
146 av_log(s, AV_LOG_ERROR, "Invalid number of channels\n");
147 return AVERROR_INVALIDDATA;
148 }
149
150 st->codecpar->bit_rate = (int64_t)read_bitrate * 1000;
151 break;
152 case MKTAG('D','S','I','Z'): // size of compressed data
153 {
154 av_dict_set_int(&s->metadata, "size", avio_rb32(s->pb), 0);
155 }
156 break;
157 case MKTAG('Y','E','A','R'): // recording date
158 case MKTAG('E','N','C','D'): // compression date
159 case MKTAG('E','X','T','R'): // reserved
160 case MKTAG('_','Y','M','H'): // reserved
161 case MKTAG('_','N','T','T'): // reserved
162 case MKTAG('_','I','D','3'): // reserved for ID3 tags
163 avio_skip(s->pb, FFMIN(len, header_size));
164 break;
165 default:
166 add_metadata(s, chunk_tag, len, header_size);
167 break;
168 }
169
170 header_size -= len;
171
172 } while (header_size >= 0 && !avio_feof(s->pb));
173
174 switch (rate_flag) {
175 case -1:
176 av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
177 return -1;
178 case 44:
179 st->codecpar->sample_rate = 44100;
180 break;
181 case 22:
182 st->codecpar->sample_rate = 22050;
183 break;
184 case 11:
185 st->codecpar->sample_rate = 11025;
186 break;
187 default:
188 if (rate_flag < 8 || rate_flag > 44) {
189 av_log(s, AV_LOG_ERROR, "Invalid rate flag %d\n", rate_flag);
190 return AVERROR_INVALIDDATA;
191 }
192 st->codecpar->sample_rate = rate_flag*1000;
193 break;
194 }
195
196 if (read_bitrate / st->codecpar->ch_layout.nb_channels < 8 ||
197 read_bitrate / st->codecpar->ch_layout.nb_channels > 48) {
198 av_log(s, AV_LOG_ERROR, "Invalid bitrate per channel %d\n",
199 read_bitrate / st->codecpar->ch_layout.nb_channels);
200 return AVERROR_INVALIDDATA;
201 }
202
203 switch (((st->codecpar->sample_rate/1000) << 8) +
204 read_bitrate/st->codecpar->ch_layout.nb_channels) {
205 case (11<<8) + 8 :
206 case (8 <<8) + 8 :
207 case (11<<8) + 10:
208 case (22<<8) + 32:
209 size = 512;
210 break;
211 case (16<<8) + 16:
212 case (22<<8) + 20:
213 case (22<<8) + 24:
214 size = 1024;
215 break;
216 case (44<<8) + 40:
217 case (44<<8) + 48:
218 size = 2048;
219 break;
220 default:
221 av_log(s, AV_LOG_ERROR, "Mode not supported: %d Hz, %"PRId64" kb/s.\n",
222 st->codecpar->sample_rate, st->codecpar->bit_rate);
223 return -1;
224 }
225 c->frame_bit_len = st->codecpar->bit_rate*size/st->codecpar->sample_rate;
226 avpriv_set_pts_info(st, 64, size, st->codecpar->sample_rate);
227
228 /* put first 12 bytes of COMM chunk in extradata */
229 if ((ret = ff_alloc_extradata(st->codecpar, 12)) < 0)
230 return ret;
231 memcpy(st->codecpar->extradata, comm_chunk, 12);
232
233 ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv);
234
235 return 0;
236 }
237
vqf_read_packet(AVFormatContext * s,AVPacket * pkt)238 static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
239 {
240 VqfContext *c = s->priv_data;
241 int ret;
242 int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
243
244 if ((ret = av_new_packet(pkt, size + 2)) < 0)
245 return ret;
246
247 pkt->pos = avio_tell(s->pb);
248 pkt->stream_index = 0;
249 pkt->duration = 1;
250
251 pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
252 pkt->data[1] = c->last_frame_bits;
253 ret = avio_read(s->pb, pkt->data+2, size);
254
255 if (ret != size) {
256 return AVERROR(EIO);
257 }
258
259 c->last_frame_bits = pkt->data[size+1];
260 c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits;
261
262 return size+2;
263 }
264
vqf_read_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)265 static int vqf_read_seek(AVFormatContext *s,
266 int stream_index, int64_t timestamp, int flags)
267 {
268 VqfContext *c = s->priv_data;
269 AVStream *st;
270 int64_t ret;
271 int64_t pos;
272
273 st = s->streams[stream_index];
274 pos = av_rescale_rnd(timestamp * st->codecpar->bit_rate,
275 st->time_base.num,
276 st->time_base.den * (int64_t)c->frame_bit_len,
277 (flags & AVSEEK_FLAG_BACKWARD) ?
278 AV_ROUND_DOWN : AV_ROUND_UP);
279 pos *= c->frame_bit_len;
280
281 ffstream(st)->cur_dts = av_rescale(pos, st->time_base.den,
282 st->codecpar->bit_rate * (int64_t)st->time_base.num);
283
284 if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + ffformatcontext(s)->data_offset, SEEK_SET)) < 0)
285 return ret;
286
287 c->remaining_bits = -7 - ((pos-7)&7);
288 return 0;
289 }
290
291 const AVInputFormat ff_vqf_demuxer = {
292 .name = "vqf",
293 .long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
294 .priv_data_size = sizeof(VqfContext),
295 .read_probe = vqf_probe,
296 .read_header = vqf_read_header,
297 .read_packet = vqf_read_packet,
298 .read_seek = vqf_read_seek,
299 .extensions = "vqf,vql,vqe",
300 };
301