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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(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; | |
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 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
111 | st->codec->codec_id = AV_CODEC_ID_TWINVQ; | |
112 | st->start_time = 0; | |
113 | ||
114 | do { | |
115 | int len; | |
116 | chunk_tag = avio_rl32(s->pb); | |
117 | ||
118 | if (chunk_tag == MKTAG('D','A','T','A')) | |
119 | break; | |
120 | ||
121 | len = avio_rb32(s->pb); | |
122 | ||
123 | if ((unsigned) len > INT_MAX/2) { | |
124 | av_log(s, AV_LOG_ERROR, "Malformed header\n"); | |
125 | return -1; | |
126 | } | |
127 | ||
128 | header_size -= 8; | |
129 | ||
130 | switch(chunk_tag){ | |
131 | case MKTAG('C','O','M','M'): | |
132 | avio_read(s->pb, comm_chunk, 12); | |
133 | st->codec->channels = AV_RB32(comm_chunk ) + 1; | |
134 | read_bitrate = AV_RB32(comm_chunk + 4); | |
135 | rate_flag = AV_RB32(comm_chunk + 8); | |
136 | avio_skip(s->pb, len-12); | |
137 | ||
138 | if (st->codec->channels <= 0) { | |
139 | av_log(s, AV_LOG_ERROR, "Invalid number of channels\n"); | |
140 | return AVERROR_INVALIDDATA; | |
141 | } | |
142 | ||
143 | st->codec->bit_rate = read_bitrate*1000; | |
144 | break; | |
145 | case MKTAG('D','S','I','Z'): // size of compressed data | |
146 | { | |
147 | av_dict_set_int(&s->metadata, "size", avio_rb32(s->pb), 0); | |
148 | } | |
149 | break; | |
150 | case MKTAG('Y','E','A','R'): // recording date | |
151 | case MKTAG('E','N','C','D'): // compression date | |
152 | case MKTAG('E','X','T','R'): // reserved | |
153 | case MKTAG('_','Y','M','H'): // reserved | |
154 | case MKTAG('_','N','T','T'): // reserved | |
155 | case MKTAG('_','I','D','3'): // reserved for ID3 tags | |
156 | avio_skip(s->pb, FFMIN(len, header_size)); | |
157 | break; | |
158 | default: | |
159 | add_metadata(s, chunk_tag, len, header_size); | |
160 | break; | |
161 | } | |
162 | ||
163 | header_size -= len; | |
164 | ||
165 | } while (header_size >= 0 && !avio_feof(s->pb)); | |
166 | ||
167 | switch (rate_flag) { | |
168 | case -1: | |
169 | av_log(s, AV_LOG_ERROR, "COMM tag not found!\n"); | |
170 | return -1; | |
171 | case 44: | |
172 | st->codec->sample_rate = 44100; | |
173 | break; | |
174 | case 22: | |
175 | st->codec->sample_rate = 22050; | |
176 | break; | |
177 | case 11: | |
178 | st->codec->sample_rate = 11025; | |
179 | break; | |
180 | default: | |
181 | if (rate_flag < 8 || rate_flag > 44) { | |
182 | av_log(s, AV_LOG_ERROR, "Invalid rate flag %d\n", rate_flag); | |
183 | return AVERROR_INVALIDDATA; | |
184 | } | |
185 | st->codec->sample_rate = rate_flag*1000; | |
186 | break; | |
187 | } | |
188 | ||
189 | if (read_bitrate / st->codec->channels < 8 || | |
190 | read_bitrate / st->codec->channels > 48) { | |
191 | av_log(s, AV_LOG_ERROR, "Invalid bitrate per channel %d\n", | |
192 | read_bitrate / st->codec->channels); | |
193 | return AVERROR_INVALIDDATA; | |
194 | } | |
195 | ||
196 | switch (((st->codec->sample_rate/1000) << 8) + | |
197 | read_bitrate/st->codec->channels) { | |
198 | case (11<<8) + 8 : | |
199 | case (8 <<8) + 8 : | |
200 | case (11<<8) + 10: | |
201 | case (22<<8) + 32: | |
202 | size = 512; | |
203 | break; | |
204 | case (16<<8) + 16: | |
205 | case (22<<8) + 20: | |
206 | case (22<<8) + 24: | |
207 | size = 1024; | |
208 | break; | |
209 | case (44<<8) + 40: | |
210 | case (44<<8) + 48: | |
211 | size = 2048; | |
212 | break; | |
213 | default: | |
214 | av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n", | |
215 | st->codec->sample_rate, st->codec->bit_rate); | |
216 | return -1; | |
217 | } | |
218 | c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate; | |
219 | avpriv_set_pts_info(st, 64, size, st->codec->sample_rate); | |
220 | ||
221 | /* put first 12 bytes of COMM chunk in extradata */ | |
222 | if (ff_alloc_extradata(st->codec, 12)) | |
223 | return AVERROR(ENOMEM); | |
224 | memcpy(st->codec->extradata, comm_chunk, 12); | |
225 | ||
226 | ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt) | |
232 | { | |
233 | VqfContext *c = s->priv_data; | |
234 | int ret; | |
235 | int size = (c->frame_bit_len - c->remaining_bits + 7)>>3; | |
236 | ||
237 | if (av_new_packet(pkt, size+2) < 0) | |
238 | return AVERROR(EIO); | |
239 | ||
240 | pkt->pos = avio_tell(s->pb); | |
241 | pkt->stream_index = 0; | |
242 | pkt->duration = 1; | |
243 | ||
244 | pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip | |
245 | pkt->data[1] = c->last_frame_bits; | |
246 | ret = avio_read(s->pb, pkt->data+2, size); | |
247 | ||
248 | if (ret != size) { | |
249 | av_free_packet(pkt); | |
250 | return AVERROR(EIO); | |
251 | } | |
252 | ||
253 | c->last_frame_bits = pkt->data[size+1]; | |
254 | c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits; | |
255 | ||
256 | return size+2; | |
257 | } | |
258 | ||
259 | static int vqf_read_seek(AVFormatContext *s, | |
260 | int stream_index, int64_t timestamp, int flags) | |
261 | { | |
262 | VqfContext *c = s->priv_data; | |
263 | AVStream *st; | |
264 | int ret; | |
265 | int64_t pos; | |
266 | ||
267 | st = s->streams[stream_index]; | |
268 | pos = av_rescale_rnd(timestamp * st->codec->bit_rate, | |
269 | st->time_base.num, | |
270 | st->time_base.den * (int64_t)c->frame_bit_len, | |
271 | (flags & AVSEEK_FLAG_BACKWARD) ? | |
272 | AV_ROUND_DOWN : AV_ROUND_UP); | |
273 | pos *= c->frame_bit_len; | |
274 | ||
275 | st->cur_dts = av_rescale(pos, st->time_base.den, | |
276 | st->codec->bit_rate * (int64_t)st->time_base.num); | |
277 | ||
278 | if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0) | |
279 | return ret; | |
280 | ||
281 | c->remaining_bits = -7 - ((pos-7)&7); | |
282 | return 0; | |
283 | } | |
284 | ||
285 | AVInputFormat ff_vqf_demuxer = { | |
286 | .name = "vqf", | |
287 | .long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"), | |
288 | .priv_data_size = sizeof(VqfContext), | |
289 | .read_probe = vqf_probe, | |
290 | .read_header = vqf_read_header, | |
291 | .read_packet = vqf_read_packet, | |
292 | .read_seek = vqf_read_seek, | |
293 | .extensions = "vqf,vql,vqe", | |
294 | }; |