Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavformat / vqf.c
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 };