1/*
2 * VQF demuxer
3 * Copyright (c) 2009 Vitor Sessak
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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
29typedef struct VqfContext {
30    int frame_bit_len;
31    uint8_t last_frame_bits;
32    int remaining_bits;
33} VqfContext;
34
35static 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    return AVPROBE_SCORE_MAX/2;
47}
48
49static 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);
64    av_dict_set(&s->metadata, key, buf, AV_DICT_DONT_STRDUP_VAL);
65}
66
67static const AVMetadataConv vqf_metadata_conv[] = {
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
89static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap)
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
107    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
108    st->codec->codec_id   = CODEC_ID_TWINVQ;
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            st->codec->bit_rate              = read_bitrate*1000;
136            break;
137        case MKTAG('D','S','I','Z'): // size of compressed data
138        {
139            char buf[8] = {0};
140            int size = avio_rb32(s->pb);
141
142            snprintf(buf, sizeof(buf), "%d", size);
143            av_dict_set(&s->metadata, "size", buf, 0);
144        }
145            break;
146        case MKTAG('Y','E','A','R'): // recording date
147        case MKTAG('E','N','C','D'): // compression date
148        case MKTAG('E','X','T','R'): // reserved
149        case MKTAG('_','Y','M','H'): // reserved
150        case MKTAG('_','N','T','T'): // reserved
151        case MKTAG('_','I','D','3'): // reserved for ID3 tags
152            avio_skip(s->pb, FFMIN(len, header_size));
153            break;
154        default:
155            add_metadata(s, chunk_tag, len, header_size);
156            break;
157        }
158
159        header_size -= len;
160
161    } while (header_size >= 0);
162
163    switch (rate_flag) {
164    case -1:
165        av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
166        return -1;
167    case 44:
168        st->codec->sample_rate = 44100;
169        break;
170    case 22:
171        st->codec->sample_rate = 22050;
172        break;
173    case 11:
174        st->codec->sample_rate = 11025;
175        break;
176    default:
177        st->codec->sample_rate = rate_flag*1000;
178        break;
179    }
180
181    switch (((st->codec->sample_rate/1000) << 8) +
182            read_bitrate/st->codec->channels) {
183    case (11<<8) + 8 :
184    case (8 <<8) + 8 :
185    case (11<<8) + 10:
186    case (22<<8) + 32:
187        size = 512;
188        break;
189    case (16<<8) + 16:
190    case (22<<8) + 20:
191    case (22<<8) + 24:
192        size = 1024;
193        break;
194    case (44<<8) + 40:
195    case (44<<8) + 48:
196        size = 2048;
197        break;
198    default:
199        av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n",
200               st->codec->sample_rate, st->codec->bit_rate);
201        return -1;
202    }
203    c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
204    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
205
206    /* put first 12 bytes of COMM chunk in extradata */
207    if (!(st->codec->extradata = av_malloc(12 + FF_INPUT_BUFFER_PADDING_SIZE)))
208        return AVERROR(ENOMEM);
209    st->codec->extradata_size = 12;
210    memcpy(st->codec->extradata, comm_chunk, 12);
211
212    ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv);
213
214    return 0;
215}
216
217static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
218{
219    VqfContext *c = s->priv_data;
220    int ret;
221    int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
222
223    pkt->pos          = avio_tell(s->pb);
224    pkt->stream_index = 0;
225
226    if (av_new_packet(pkt, size+2) < 0)
227        return AVERROR(EIO);
228
229    pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
230    pkt->data[1] = c->last_frame_bits;
231    ret = avio_read(s->pb, pkt->data+2, size);
232
233    if (ret<=0) {
234        av_free_packet(pkt);
235        return AVERROR(EIO);
236    }
237
238    c->last_frame_bits = pkt->data[size+1];
239    c->remaining_bits  = (size << 3) - c->frame_bit_len + c->remaining_bits;
240
241    return size+2;
242}
243
244static int vqf_read_seek(AVFormatContext *s,
245                         int stream_index, int64_t timestamp, int flags)
246{
247    VqfContext *c = s->priv_data;
248    AVStream *st;
249    int ret;
250    int64_t pos;
251
252    st = s->streams[stream_index];
253    pos = av_rescale_rnd(timestamp * st->codec->bit_rate,
254                         st->time_base.num,
255                         st->time_base.den * (int64_t)c->frame_bit_len,
256                         (flags & AVSEEK_FLAG_BACKWARD) ?
257                                                   AV_ROUND_DOWN : AV_ROUND_UP);
258    pos *= c->frame_bit_len;
259
260    st->cur_dts = av_rescale(pos, st->time_base.den,
261                             st->codec->bit_rate * (int64_t)st->time_base.num);
262
263    if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0)
264        return ret;
265
266    c->remaining_bits = -7 - ((pos-7)&7);
267    return 0;
268}
269
270AVInputFormat ff_vqf_demuxer = {
271    .name           = "vqf",
272    .long_name      = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
273    .priv_data_size = sizeof(VqfContext),
274    .read_probe     = vqf_probe,
275    .read_header    = vqf_read_header,
276    .read_packet    = vqf_read_packet,
277    .read_seek      = vqf_read_seek,
278    .extensions     = "vqf,vql,vqe",
279};
280