libavformat/vqf.c

   1 /*
   2  * VQF demuxer
   3  * Copyright (c) 2009 Vitor Sessak
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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
  25 typedef struct VqfContext {
  26     int frame_bit_len;
  27     uint8_t last_frame_bits;
  28     int remaining_bits;
  29 } VqfContext;
  30
  31 static int vqf_probe(AVProbeData *probe_packet)
  32 {
  33     if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N'))
  34         return 0;
  35
  36     if (!memcmp(probe_packet->buf + 4, "97012000", 8))
  37         return AVPROBE_SCORE_MAX;
  38
  39     if (!memcmp(probe_packet->buf + 4, "00052200", 8))
  40         return AVPROBE_SCORE_MAX;
  41
  42     return AVPROBE_SCORE_MAX/2;
  43 }
  44
  45 static void add_metadata(AVFormatContext *s, const char *tag,
  46                          unsigned int tag_len, unsigned int remaining)
  47 {
  48     char buf[2048];
  49     int len = FFMIN3(tag_len, remaining, sizeof(buf) - 1);
  50
  51     if (len != tag_len)
  52         av_log(s, AV_LOG_ERROR, "Warning: truncating metadata!\n");
  53
  54     get_buffer(s->pb, buf, len);
  55     buf[len] = 0;
  56     av_metadata_set(&s->metadata, tag, buf);
  57 }
  58
  59 static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap)
  60 {
  61     VqfContext *c = s->priv_data;
  62     AVStream *st  = av_new_stream(s, 0);
  63     int chunk_tag;
  64     int rate_flag = -1;
  65     int header_size;
  66     int read_bitrate = 0;
  67     int size;
  68
  69     if (!st)
  70         return AVERROR(ENOMEM);
  71
  72     url_fskip(s->pb, 12);
  73
  74     header_size = get_be32(s->pb);
  75
  76     st->codec->codec_type = CODEC_TYPE_AUDIO;
  77     st->codec->codec_id   = CODEC_ID_TWINVQ;
  78     st->start_time = 0;
  79
  80     do {
  81         int len;
  82         chunk_tag = get_le32(s->pb);
  83
  84         if (chunk_tag == MKTAG('D','A','T','A'))
  85             break;
  86
  87         len = get_be32(s->pb);
  88
  89         if ((unsigned) len > INT_MAX/2) {
  90             av_log(s, AV_LOG_ERROR, "Malformed header\n");
  91             return -1;
  92         }
  93
  94         header_size -= 8;
  95
  96         switch(chunk_tag){
  97         case MKTAG('C','O','M','M'):
  98             st->codec->channels = get_be32(s->pb) + 1;
  99             read_bitrate        = get_be32(s->pb);
 100             rate_flag           = get_be32(s->pb);
 101             url_fskip(s->pb, len-12);
 102
 103             st->codec->bit_rate              = read_bitrate*1000;
 104             st->codec->bits_per_coded_sample = 16;
 105             break;
 106         case MKTAG('N','A','M','E'):
 107             add_metadata(s, "title"    , len, header_size);
 108             break;
 109         case MKTAG('(','c',')',' '):
 110             add_metadata(s, "copyright", len, header_size);
 111             break;
 112         case MKTAG('A','U','T','H'):
 113             add_metadata(s, "author"   , len, header_size);
 114             break;
 115         case MKTAG('A','L','B','M'):
 116             add_metadata(s, "album"    , len, header_size);
 117             break;
 118         case MKTAG('T','R','C','K'):
 119             add_metadata(s, "track"    , len, header_size);
 120             break;
 121         case MKTAG('C','O','M','T'):
 122             add_metadata(s, "comment"  , len, header_size);
 123             break;
 124         case MKTAG('F','I','L','E'):
 125             add_metadata(s, "filename" , len, header_size);
 126             break;
 127         case MKTAG('D','S','I','Z'):
 128             add_metadata(s, "size"     , len, header_size);
 129             break;
 130         case MKTAG('D','A','T','E'):
 131             add_metadata(s, "date"     , len, header_size);
 132             break;
 133         case MKTAG('G','E','N','R'):
 134             add_metadata(s, "genre"    , len, header_size);
 135             break;
 136         default:
 137             av_log(s, AV_LOG_ERROR, "Unknown chunk: %c%c%c%c\n",
 138                    ((char*)&chunk_tag)[0], ((char*)&chunk_tag)[1],
 139                    ((char*)&chunk_tag)[2], ((char*)&chunk_tag)[3]);
 140             url_fskip(s->pb, FFMIN(len, header_size));
 141             break;
 142         }
 143
 144         header_size -= len;
 145
 146     } while (header_size >= 0);
 147
 148     switch (rate_flag) {
 149     case -1:
 150         av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
 151         return -1;
 152     case 44:
 153         st->codec->sample_rate = 44100;
 154         break;
 155     case 22:
 156         st->codec->sample_rate = 22050;
 157         break;
 158     case 11:
 159         st->codec->sample_rate = 11025;
 160         break;
 161     default:
 162         st->codec->sample_rate = rate_flag*1000;
 163         break;
 164     }
 165
 166     switch (((st->codec->sample_rate/1000) << 8) +
 167             read_bitrate/st->codec->channels) {
 168     case (11<<8) + 8 :
 169     case (8 <<8) + 8 :
 170     case (11<<8) + 10:
 171     case (22<<8) + 32:
 172         size = 512;
 173         break;
 174     case (16<<8) + 16:
 175     case (22<<8) + 20:
 176     case (22<<8) + 24:
 177         size = 1024;
 178         break;
 179     case (44<<8) + 40:
 180     case (44<<8) + 48:
 181         size = 2048;
 182         break;
 183     default:
 184         av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n",
 185                st->codec->sample_rate, st->codec->bit_rate);
 186         return -1;
 187     }
 188     c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
 189
 190     return 0;
 191 }
 192
 193 static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
 194 {
 195     VqfContext *c = s->priv_data;
 196     int ret;
 197     int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
 198
 199     pkt->pos          = url_ftell(s->pb);
 200     pkt->stream_index = 0;
 201
 202     if (av_new_packet(pkt, size+2) < 0)
 203         return AVERROR(EIO);
 204
 205     pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
 206     pkt->data[1] = c->last_frame_bits;
 207     ret = get_buffer(s->pb, pkt->data+2, size);
 208
 209     if (ret<=0) {
 210         av_free_packet(pkt);
 211         return AVERROR(EIO);
 212     }
 213
 214     c->last_frame_bits = pkt->data[size+1];
 215     c->remaining_bits  = (size << 3) - c->frame_bit_len + c->remaining_bits;
 216
 217     return size+2;
 218 }
 219
 220 static int vqf_read_seek(AVFormatContext *s,
 221                          int stream_index, int64_t timestamp, int flags)
 222 {
 223     VqfContext *c = s->priv_data;
 224     AVStream *st;
 225     int ret;
 226     int64_t pos;
 227
 228     st = s->streams[stream_index];
 229     pos = av_rescale_rnd(timestamp * st->codec->bit_rate,
 230                          st->time_base.num,
 231                          st->time_base.den * (int64_t)c->frame_bit_len,
 232                          (flags & AVSEEK_FLAG_BACKWARD) ?
 233                                                    AV_ROUND_DOWN : AV_ROUND_UP);
 234     pos *= c->frame_bit_len;
 235
 236     st->cur_dts = av_rescale(pos, st->time_base.den,
 237                              st->codec->bit_rate * (int64_t)st->time_base.num);
 238
 239     if ((ret = url_fseek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0)
 240         return ret;
 241
 242     c->remaining_bits = -7 - ((pos-7)&7);
 243     return 0;
 244 }
 245
 246 AVInputFormat vqf_demuxer = {
 247     "vqf",
 248     NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
 249     sizeof(VqfContext),
 250     vqf_probe,
 251     vqf_read_header,
 252     vqf_read_packet,
 253     NULL,
 254     vqf_read_seek,
 255     .extensions = "vqf",
 256 };