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     uint8_t comm_chunk[12];
  74
  75     if (!st)
  76         return AVERROR(ENOMEM);
  77
  78     avio_skip(s->pb, 12);
  79
  80     header_size = avio_rb32(s->pb);
  81
  82     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  83     st->codec->codec_id   = CODEC_ID_TWINVQ;
  84     st->start_time = 0;
  85
  86     do {
  87         int len;
  88         chunk_tag = avio_rl32(s->pb);
  89
  90         if (chunk_tag == MKTAG('D','A','T','A'))
  91             break;
  92
  93         len = avio_rb32(s->pb);
  94
  95         if ((unsigned) len > INT_MAX/2) {
  96             av_log(s, AV_LOG_ERROR, "Malformed header\n");
  97             return -1;
  98         }
  99
 100         header_size -= 8;
 101
 102         switch(chunk_tag){
 103         case MKTAG('C','O','M','M'):
 104             avio_read(s->pb, comm_chunk, 12);
 105             st->codec->channels = AV_RB32(comm_chunk    ) + 1;
 106             read_bitrate        = AV_RB32(comm_chunk + 4);
 107             rate_flag           = AV_RB32(comm_chunk + 8);
 108             avio_skip(s->pb, len-12);
 109
 110             st->codec->bit_rate              = read_bitrate*1000;
 111             break;
 112         case MKTAG('N','A','M','E'):
 113             add_metadata(s, "title"    , len, header_size);
 114             break;
 115         case MKTAG('(','c',')',' '):
 116             add_metadata(s, "copyright", len, header_size);
 117             break;
 118         case MKTAG('A','U','T','H'):
 119             add_metadata(s, "author"   , len, header_size);
 120             break;
 121         case MKTAG('A','L','B','M'):
 122             add_metadata(s, "album"    , len, header_size);
 123             break;
 124         case MKTAG('T','R','C','K'):
 125             add_metadata(s, "track"    , len, header_size);
 126             break;
 127         case MKTAG('C','O','M','T'):
 128             add_metadata(s, "comment"  , len, header_size);
 129             break;
 130         case MKTAG('F','I','L','E'):
 131             add_metadata(s, "filename" , len, header_size);
 132             break;
 133         case MKTAG('D','S','I','Z'):
 134             add_metadata(s, "size"     , len, header_size);
 135             break;
 136         case MKTAG('D','A','T','E'):
 137             add_metadata(s, "date"     , len, header_size);
 138             break;
 139         case MKTAG('G','E','N','R'):
 140             add_metadata(s, "genre"    , len, header_size);
 141             break;
 142         default:
 143             av_log(s, AV_LOG_ERROR, "Unknown chunk: %c%c%c%c\n",
 144                    ((char*)&chunk_tag)[0], ((char*)&chunk_tag)[1],
 145                    ((char*)&chunk_tag)[2], ((char*)&chunk_tag)[3]);
 146             avio_skip(s->pb, FFMIN(len, header_size));
 147             break;
 148         }
 149
 150         header_size -= len;
 151
 152     } while (header_size >= 0);
 153
 154     switch (rate_flag) {
 155     case -1:
 156         av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
 157         return -1;
 158     case 44:
 159         st->codec->sample_rate = 44100;
 160         break;
 161     case 22:
 162         st->codec->sample_rate = 22050;
 163         break;
 164     case 11:
 165         st->codec->sample_rate = 11025;
 166         break;
 167     default:
 168         st->codec->sample_rate = rate_flag*1000;
 169         break;
 170     }
 171
 172     switch (((st->codec->sample_rate/1000) << 8) +
 173             read_bitrate/st->codec->channels) {
 174     case (11<<8) + 8 :
 175     case (8 <<8) + 8 :
 176     case (11<<8) + 10:
 177     case (22<<8) + 32:
 178         size = 512;
 179         break;
 180     case (16<<8) + 16:
 181     case (22<<8) + 20:
 182     case (22<<8) + 24:
 183         size = 1024;
 184         break;
 185     case (44<<8) + 40:
 186     case (44<<8) + 48:
 187         size = 2048;
 188         break;
 189     default:
 190         av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n",
 191                st->codec->sample_rate, st->codec->bit_rate);
 192         return -1;
 193     }
 194     c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
 195     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
 196
 197     /* put first 12 bytes of COMM chunk in extradata */
 198     if (!(st->codec->extradata = av_malloc(12 + FF_INPUT_BUFFER_PADDING_SIZE)))
 199         return AVERROR(ENOMEM);
 200     st->codec->extradata_size = 12;
 201     memcpy(st->codec->extradata, comm_chunk, 12);
 202
 203     return 0;
 204 }
 205
 206 static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
 207 {
 208     VqfContext *c = s->priv_data;
 209     int ret;
 210     int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
 211
 212     pkt->pos          = avio_tell(s->pb);
 213     pkt->stream_index = 0;
 214
 215     if (av_new_packet(pkt, size+2) < 0)
 216         return AVERROR(EIO);
 217
 218     pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
 219     pkt->data[1] = c->last_frame_bits;
 220     ret = avio_read(s->pb, pkt->data+2, size);
 221
 222     if (ret<=0) {
 223         av_free_packet(pkt);
 224         return AVERROR(EIO);
 225     }
 226
 227     c->last_frame_bits = pkt->data[size+1];
 228     c->remaining_bits  = (size << 3) - c->frame_bit_len + c->remaining_bits;
 229
 230     return size+2;
 231 }
 232
 233 static int vqf_read_seek(AVFormatContext *s,
 234                          int stream_index, int64_t timestamp, int flags)
 235 {
 236     VqfContext *c = s->priv_data;
 237     AVStream *st;
 238     int ret;
 239     int64_t pos;
 240
 241     st = s->streams[stream_index];
 242     pos = av_rescale_rnd(timestamp * st->codec->bit_rate,
 243                          st->time_base.num,
 244                          st->time_base.den * (int64_t)c->frame_bit_len,
 245                          (flags & AVSEEK_FLAG_BACKWARD) ?
 246                                                    AV_ROUND_DOWN : AV_ROUND_UP);
 247     pos *= c->frame_bit_len;
 248
 249     st->cur_dts = av_rescale(pos, st->time_base.den,
 250                              st->codec->bit_rate * (int64_t)st->time_base.num);
 251
 252     if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0)
 253         return ret;
 254
 255     c->remaining_bits = -7 - ((pos-7)&7);
 256     return 0;
 257 }
 258
 259 AVInputFormat ff_vqf_demuxer = {
 260     .name           = "vqf",
 261     .long_name      = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
 262     .priv_data_size = sizeof(VqfContext),
 263     .read_probe     = vqf_probe,
 264     .read_header    = vqf_read_header,
 265     .read_packet    = vqf_read_packet,
 266     .read_seek      = vqf_read_seek,
 267     .extensions = "vqf",
 268 };