3 * Copyright (c) 2009 Vitor Sessak
5 * This file is part of Libav.
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.
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.
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
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/dict.h"
25 #include "libavutil/mathematics.h"
27 typedef struct VqfContext {
29 uint8_t last_frame_bits;
33 static int vqf_probe(AVProbeData *probe_packet)
35 if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N'))
38 if (!memcmp(probe_packet->buf + 4, "97012000", 8))
39 return AVPROBE_SCORE_MAX;
41 if (!memcmp(probe_packet->buf + 4, "00052200", 8))
42 return AVPROBE_SCORE_MAX;
44 return AVPROBE_SCORE_MAX/2;
47 static void add_metadata(AVFormatContext *s, const char *tag,
48 unsigned int tag_len, unsigned int remaining)
50 int len = FFMIN(tag_len, remaining);
56 buf = av_malloc(len+1);
59 avio_read(s->pb, buf, len);
61 av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
64 static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap)
66 VqfContext *c = s->priv_data;
67 AVStream *st = avformat_new_stream(s, NULL);
75 return AVERROR(ENOMEM);
79 header_size = avio_rb32(s->pb);
81 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
82 st->codec->codec_id = CODEC_ID_TWINVQ;
87 chunk_tag = avio_rl32(s->pb);
89 if (chunk_tag == MKTAG('D','A','T','A'))
92 len = avio_rb32(s->pb);
94 if ((unsigned) len > INT_MAX/2) {
95 av_log(s, AV_LOG_ERROR, "Malformed header\n");
102 case MKTAG('C','O','M','M'):
103 st->codec->channels = avio_rb32(s->pb) + 1;
104 read_bitrate = avio_rb32(s->pb);
105 rate_flag = avio_rb32(s->pb);
106 avio_skip(s->pb, len-12);
108 st->codec->bit_rate = read_bitrate*1000;
109 st->codec->bits_per_coded_sample = 16;
111 case MKTAG('N','A','M','E'):
112 add_metadata(s, "title" , len, header_size);
114 case MKTAG('(','c',')',' '):
115 add_metadata(s, "copyright", len, header_size);
117 case MKTAG('A','U','T','H'):
118 add_metadata(s, "author" , len, header_size);
120 case MKTAG('A','L','B','M'):
121 add_metadata(s, "album" , len, header_size);
123 case MKTAG('T','R','C','K'):
124 add_metadata(s, "track" , len, header_size);
126 case MKTAG('C','O','M','T'):
127 add_metadata(s, "comment" , len, header_size);
129 case MKTAG('F','I','L','E'):
130 add_metadata(s, "filename" , len, header_size);
132 case MKTAG('D','S','I','Z'):
133 add_metadata(s, "size" , len, header_size);
135 case MKTAG('D','A','T','E'):
136 add_metadata(s, "date" , len, header_size);
138 case MKTAG('G','E','N','R'):
139 add_metadata(s, "genre" , len, header_size);
142 av_log(s, AV_LOG_ERROR, "Unknown chunk: %c%c%c%c\n",
143 ((char*)&chunk_tag)[0], ((char*)&chunk_tag)[1],
144 ((char*)&chunk_tag)[2], ((char*)&chunk_tag)[3]);
145 avio_skip(s->pb, FFMIN(len, header_size));
151 } while (header_size >= 0);
155 av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
158 st->codec->sample_rate = 44100;
161 st->codec->sample_rate = 22050;
164 st->codec->sample_rate = 11025;
167 st->codec->sample_rate = rate_flag*1000;
171 switch (((st->codec->sample_rate/1000) << 8) +
172 read_bitrate/st->codec->channels) {
189 av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n",
190 st->codec->sample_rate, st->codec->bit_rate);
193 c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
194 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
199 static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
201 VqfContext *c = s->priv_data;
203 int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
205 pkt->pos = avio_tell(s->pb);
206 pkt->stream_index = 0;
208 if (av_new_packet(pkt, size+2) < 0)
211 pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
212 pkt->data[1] = c->last_frame_bits;
213 ret = avio_read(s->pb, pkt->data+2, size);
220 c->last_frame_bits = pkt->data[size+1];
221 c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits;
226 static int vqf_read_seek(AVFormatContext *s,
227 int stream_index, int64_t timestamp, int flags)
229 VqfContext *c = s->priv_data;
234 st = s->streams[stream_index];
235 pos = av_rescale_rnd(timestamp * st->codec->bit_rate,
237 st->time_base.den * (int64_t)c->frame_bit_len,
238 (flags & AVSEEK_FLAG_BACKWARD) ?
239 AV_ROUND_DOWN : AV_ROUND_UP);
240 pos *= c->frame_bit_len;
242 st->cur_dts = av_rescale(pos, st->time_base.den,
243 st->codec->bit_rate * (int64_t)st->time_base.num);
245 if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0)
248 c->remaining_bits = -7 - ((pos-7)&7);
252 AVInputFormat ff_vqf_demuxer = {
254 .long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
255 .priv_data_size = sizeof(VqfContext),
256 .read_probe = vqf_probe,
257 .read_header = vqf_read_header,
258 .read_packet = vqf_read_packet,
259 .read_seek = vqf_read_seek,