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 "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     return AVPROBE_SCORE_MAX/2;
  47 }
  48
  49 static 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
  67 static 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
  89 static 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
 217 static 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
 244 static 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
 270 AVInputFormat 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 };