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
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/mathematics.h"
29 typedef struct VqfContext {
31 uint8_t last_frame_bits;
35 static int vqf_probe(AVProbeData *probe_packet)
37 if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N'))
40 if (!memcmp(probe_packet->buf + 4, "97012000", 8))
41 return AVPROBE_SCORE_MAX;
43 if (!memcmp(probe_packet->buf + 4, "00052200", 8))
44 return AVPROBE_SCORE_MAX;
46 return AVPROBE_SCORE_MAX/2;
49 static void add_metadata(AVFormatContext *s, uint32_t tag,
50 unsigned int tag_len, unsigned int remaining)
52 int len = FFMIN(tag_len, remaining);
53 char *buf, key[5] = {0};
58 buf = av_malloc(len+1);
61 avio_read(s->pb, buf, len);
64 av_dict_set(&s->metadata, key, buf, AV_DICT_DONT_STRDUP_VAL);
67 static const AVMetadataConv vqf_metadata_conv[] = {
68 { "(c) ", "copyright" },
69 { "ARNG", "arranger" },
72 { "CDCT", "conductor" },
73 { "COMT", "comment" },
74 { "FILE", "filename" },
76 { "LABL", "publisher" },
77 { "MUSC", "composer" },
80 { "PROD", "producer" },
81 { "PRSN", "personnel" },
82 { "REMX", "remixer" },
89 static int vqf_read_header(AVFormatContext *s)
91 VqfContext *c = s->priv_data;
92 AVStream *st = avformat_new_stream(s, NULL);
98 uint8_t comm_chunk[12];
101 return AVERROR(ENOMEM);
103 avio_skip(s->pb, 12);
105 header_size = avio_rb32(s->pb);
107 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
108 st->codec->codec_id = CODEC_ID_TWINVQ;
113 chunk_tag = avio_rl32(s->pb);
115 if (chunk_tag == MKTAG('D','A','T','A'))
118 len = avio_rb32(s->pb);
120 if ((unsigned) len > INT_MAX/2) {
121 av_log(s, AV_LOG_ERROR, "Malformed header\n");
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);
135 st->codec->bit_rate = read_bitrate*1000;
137 case MKTAG('D','S','I','Z'): // size of compressed data
140 int size = avio_rb32(s->pb);
142 snprintf(buf, sizeof(buf), "%d", size);
143 av_dict_set(&s->metadata, "size", buf, 0);
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));
155 add_metadata(s, chunk_tag, len, header_size);
161 } while (header_size >= 0);
165 av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
168 st->codec->sample_rate = 44100;
171 st->codec->sample_rate = 22050;
174 st->codec->sample_rate = 11025;
177 st->codec->sample_rate = rate_flag*1000;
181 switch (((st->codec->sample_rate/1000) << 8) +
182 read_bitrate/st->codec->channels) {
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);
203 c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
204 avpriv_set_pts_info(st, 64, size, st->codec->sample_rate);
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);
212 ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv);
217 static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
219 VqfContext *c = s->priv_data;
221 int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
223 if (av_new_packet(pkt, size+2) < 0)
226 pkt->pos = avio_tell(s->pb);
227 pkt->stream_index = 0;
230 pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
231 pkt->data[1] = c->last_frame_bits;
232 ret = avio_read(s->pb, pkt->data+2, size);
239 c->last_frame_bits = pkt->data[size+1];
240 c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits;
245 static int vqf_read_seek(AVFormatContext *s,
246 int stream_index, int64_t timestamp, int flags)
248 VqfContext *c = s->priv_data;
253 st = s->streams[stream_index];
254 pos = av_rescale_rnd(timestamp * st->codec->bit_rate,
256 st->time_base.den * (int64_t)c->frame_bit_len,
257 (flags & AVSEEK_FLAG_BACKWARD) ?
258 AV_ROUND_DOWN : AV_ROUND_UP);
259 pos *= c->frame_bit_len;
261 st->cur_dts = av_rescale(pos, st->time_base.den,
262 st->codec->bit_rate * (int64_t)st->time_base.num);
264 if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0)
267 c->remaining_bits = -7 - ((pos-7)&7);
271 AVInputFormat ff_vqf_demuxer = {
273 .long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
274 .priv_data_size = sizeof(VqfContext),
275 .read_probe = vqf_probe,
276 .read_header = vqf_read_header,
277 .read_packet = vqf_read_packet,
278 .read_seek = vqf_read_seek,
279 .extensions = "vqf,vql,vqe",