libavformat/vqf.c

   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 "libavutil/intreadwrite.h"
  24 #include "libavutil/dict.h"
  25 #include "libavutil/mathematics.h"
  26
  27 typedef struct VqfContext {
  28     int frame_bit_len;
  29     uint8_t last_frame_bits;
  30     int remaining_bits;
  31 } VqfContext;
  32
  33 static int vqf_probe(AVProbeData *probe_packet)
  34 {
  35     if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N'))
  36         return 0;
  37
  38     if (!memcmp(probe_packet->buf + 4, "97012000", 8))
  39         return AVPROBE_SCORE_MAX;
  40
  41     if (!memcmp(probe_packet->buf + 4, "00052200", 8))
  42         return AVPROBE_SCORE_MAX;
  43
  44     return AVPROBE_SCORE_MAX/2;
  45 }
  46
  47 static void add_metadata(AVFormatContext *s, const char *tag,
  48                          unsigned int tag_len, unsigned int remaining)
  49 {
  50     int len = FFMIN(tag_len, remaining);
  51     char *buf;
  52
  53     if (len == UINT_MAX)
  54         return;
  55
  56     buf = av_malloc(len+1);
  57     if (!buf)
  58         return;
  59     avio_read(s->pb, buf, len);
  60     buf[len] = 0;
  61     av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
  62 }
  63
  64 static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap)
  65 {
  66     VqfContext *c = s->priv_data;
  67     AVStream *st  = avformat_new_stream(s, NULL);
  68     int chunk_tag;
  69     int rate_flag = -1;
  70     int header_size;
  71     int read_bitrate = 0;
  72     int size;
  73
  74     if (!st)
  75         return AVERROR(ENOMEM);
  76
  77     avio_skip(s->pb, 12);
  78
  79     header_size = avio_rb32(s->pb);
  80
  81     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  82     st->codec->codec_id   = CODEC_ID_TWINVQ;
  83     st->start_time = 0;
  84
  85     do {
  86         int len;
  87         chunk_tag = avio_rl32(s->pb);
  88
  89         if (chunk_tag == MKTAG('D','A','T','A'))
  90             break;
  91
  92         len = avio_rb32(s->pb);
  93
  94         if ((unsigned) len > INT_MAX/2) {
  95             av_log(s, AV_LOG_ERROR, "Malformed header\n");
  96             return -1;
  97         }
  98
  99         header_size -= 8;
 100
 101         switch(chunk_tag){
 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);
 107
 108             st->codec->bit_rate              = read_bitrate*1000;
 109             st->codec->bits_per_coded_sample = 16;
 110             break;
 111         case MKTAG('N','A','M','E'):
 112             add_metadata(s, "title"    , len, header_size);
 113             break;
 114         case MKTAG('(','c',')',' '):
 115             add_metadata(s, "copyright", len, header_size);
 116             break;
 117         case MKTAG('A','U','T','H'):
 118             add_metadata(s, "author"   , len, header_size);
 119             break;
 120         case MKTAG('A','L','B','M'):
 121             add_metadata(s, "album"    , len, header_size);
 122             break;
 123         case MKTAG('T','R','C','K'):
 124             add_metadata(s, "track"    , len, header_size);
 125             break;
 126         case MKTAG('C','O','M','T'):
 127             add_metadata(s, "comment"  , len, header_size);
 128             break;
 129         case MKTAG('F','I','L','E'):
 130             add_metadata(s, "filename" , len, header_size);
 131             break;
 132         case MKTAG('D','S','I','Z'):
 133             add_metadata(s, "size"     , len, header_size);
 134             break;
 135         case MKTAG('D','A','T','E'):
 136             add_metadata(s, "date"     , len, header_size);
 137             break;
 138         case MKTAG('G','E','N','R'):
 139             add_metadata(s, "genre"    , len, header_size);
 140             break;
 141         default:
 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));
 146             break;
 147         }
 148
 149         header_size -= len;
 150
 151     } while (header_size >= 0);
 152
 153     switch (rate_flag) {
 154     case -1:
 155         av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
 156         return -1;
 157     case 44:
 158         st->codec->sample_rate = 44100;
 159         break;
 160     case 22:
 161         st->codec->sample_rate = 22050;
 162         break;
 163     case 11:
 164         st->codec->sample_rate = 11025;
 165         break;
 166     default:
 167         st->codec->sample_rate = rate_flag*1000;
 168         break;
 169     }
 170
 171     switch (((st->codec->sample_rate/1000) << 8) +
 172             read_bitrate/st->codec->channels) {
 173     case (11<<8) + 8 :
 174     case (8 <<8) + 8 :
 175     case (11<<8) + 10:
 176     case (22<<8) + 32:
 177         size = 512;
 178         break;
 179     case (16<<8) + 16:
 180     case (22<<8) + 20:
 181     case (22<<8) + 24:
 182         size = 1024;
 183         break;
 184     case (44<<8) + 40:
 185     case (44<<8) + 48:
 186         size = 2048;
 187         break;
 188     default:
 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);
 191         return -1;
 192     }
 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);
 195
 196     return 0;
 197 }
 198
 199 static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
 200 {
 201     VqfContext *c = s->priv_data;
 202     int ret;
 203     int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
 204
 205     pkt->pos          = avio_tell(s->pb);
 206     pkt->stream_index = 0;
 207
 208     if (av_new_packet(pkt, size+2) < 0)
 209         return AVERROR(EIO);
 210
 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);
 214
 215     if (ret<=0) {
 216         av_free_packet(pkt);
 217         return AVERROR(EIO);
 218     }
 219
 220     c->last_frame_bits = pkt->data[size+1];
 221     c->remaining_bits  = (size << 3) - c->frame_bit_len + c->remaining_bits;
 222
 223     return size+2;
 224 }
 225
 226 static int vqf_read_seek(AVFormatContext *s,
 227                          int stream_index, int64_t timestamp, int flags)
 228 {
 229     VqfContext *c = s->priv_data;
 230     AVStream *st;
 231     int ret;
 232     int64_t pos;
 233
 234     st = s->streams[stream_index];
 235     pos = av_rescale_rnd(timestamp * st->codec->bit_rate,
 236                          st->time_base.num,
 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;
 241
 242     st->cur_dts = av_rescale(pos, st->time_base.den,
 243                              st->codec->bit_rate * (int64_t)st->time_base.num);
 244
 245     if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0)
 246         return ret;
 247
 248     c->remaining_bits = -7 - ((pos-7)&7);
 249     return 0;
 250 }
 251
 252 AVInputFormat ff_vqf_demuxer = {
 253     .name           = "vqf",
 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,
 260     .extensions = "vqf",
 261 };