release/src/router/ffmpeg/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     int len = FFMIN(tag_len, remaining);
  49     char *buf;
  50
  51     if (len == UINT_MAX)
  52         return;
  53
  54     buf = av_malloc(len+1);
  55     if (!buf)
  56         return;
  57     get_buffer(s->pb, buf, len);
  58     buf[len] = 0;
  59     av_metadata_set2(&s->metadata, tag, buf, AV_METADATA_DONT_STRDUP_VAL);
  60 }
  61
  62 static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap)
  63 {
  64     VqfContext *c = s->priv_data;
  65     AVStream *st  = av_new_stream(s, 0);
  66     int chunk_tag;
  67     int rate_flag = -1;
  68     int header_size;
  69     int read_bitrate = 0;
  70     int size;
  71
  72     if (!st)
  73         return AVERROR(ENOMEM);
  74
  75     url_fskip(s->pb, 12);
  76
  77     header_size = get_be32(s->pb);
  78
  79     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  80     st->codec->codec_id   = CODEC_ID_TWINVQ;
  81     st->start_time = 0;
  82
  83     do {
  84         int len;
  85         chunk_tag = get_le32(s->pb);
  86
  87         if (chunk_tag == MKTAG('D','A','T','A'))
  88             break;
  89
  90         len = get_be32(s->pb);
  91
  92         if ((unsigned) len > INT_MAX/2) {
  93             av_log(s, AV_LOG_ERROR, "Malformed header\n");
  94             return -1;
  95         }
  96
  97         header_size -= 8;
  98
  99         switch(chunk_tag){
 100         case MKTAG('C','O','M','M'):
 101             st->codec->channels = get_be32(s->pb) + 1;
 102             read_bitrate        = get_be32(s->pb);
 103             rate_flag           = get_be32(s->pb);
 104             url_fskip(s->pb, len-12);
 105
 106             st->codec->bit_rate              = read_bitrate*1000;
 107             st->codec->bits_per_coded_sample = 16;
 108             break;
 109         case MKTAG('N','A','M','E'):
 110             add_metadata(s, "title"    , len, header_size);
 111             break;
 112         case MKTAG('(','c',')',' '):
 113             add_metadata(s, "copyright", len, header_size);
 114             break;
 115         case MKTAG('A','U','T','H'):
 116             add_metadata(s, "author"   , len, header_size);
 117             break;
 118         case MKTAG('A','L','B','M'):
 119             add_metadata(s, "album"    , len, header_size);
 120             break;
 121         case MKTAG('T','R','C','K'):
 122             add_metadata(s, "track"    , len, header_size);
 123             break;
 124         case MKTAG('C','O','M','T'):
 125             add_metadata(s, "comment"  , len, header_size);
 126             break;
 127         case MKTAG('F','I','L','E'):
 128             add_metadata(s, "filename" , len, header_size);
 129             break;
 130         case MKTAG('D','S','I','Z'):
 131             add_metadata(s, "size"     , len, header_size);
 132             break;
 133         case MKTAG('D','A','T','E'):
 134             add_metadata(s, "date"     , len, header_size);
 135             break;
 136         case MKTAG('G','E','N','R'):
 137             add_metadata(s, "genre"    , len, header_size);
 138             break;
 139         default:
 140             av_log(s, AV_LOG_ERROR, "Unknown chunk: %c%c%c%c\n",
 141                    ((char*)&chunk_tag)[0], ((char*)&chunk_tag)[1],
 142                    ((char*)&chunk_tag)[2], ((char*)&chunk_tag)[3]);
 143             url_fskip(s->pb, FFMIN(len, header_size));
 144             break;
 145         }
 146
 147         header_size -= len;
 148
 149     } while (header_size >= 0);
 150
 151     switch (rate_flag) {
 152     case -1:
 153         av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
 154         return -1;
 155     case 44:
 156         st->codec->sample_rate = 44100;
 157         break;
 158     case 22:
 159         st->codec->sample_rate = 22050;
 160         break;
 161     case 11:
 162         st->codec->sample_rate = 11025;
 163         break;
 164     default:
 165         st->codec->sample_rate = rate_flag*1000;
 166         break;
 167     }
 168
 169     switch (((st->codec->sample_rate/1000) << 8) +
 170             read_bitrate/st->codec->channels) {
 171     case (11<<8) + 8 :
 172     case (8 <<8) + 8 :
 173     case (11<<8) + 10:
 174     case (22<<8) + 32:
 175         size = 512;
 176         break;
 177     case (16<<8) + 16:
 178     case (22<<8) + 20:
 179     case (22<<8) + 24:
 180         size = 1024;
 181         break;
 182     case (44<<8) + 40:
 183     case (44<<8) + 48:
 184         size = 2048;
 185         break;
 186     default:
 187         av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n",
 188                st->codec->sample_rate, st->codec->bit_rate);
 189         return -1;
 190     }
 191     c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
 192     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
 193
 194     return 0;
 195 }
 196
 197 static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
 198 {
 199     VqfContext *c = s->priv_data;
 200     int ret;
 201     int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
 202
 203     pkt->pos          = url_ftell(s->pb);
 204     pkt->stream_index = 0;
 205
 206     if (av_new_packet(pkt, size+2) < 0)
 207         return AVERROR(EIO);
 208
 209     pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
 210     pkt->data[1] = c->last_frame_bits;
 211     ret = get_buffer(s->pb, pkt->data+2, size);
 212
 213     if (ret<=0) {
 214         av_free_packet(pkt);
 215         return AVERROR(EIO);
 216     }
 217
 218     c->last_frame_bits = pkt->data[size+1];
 219     c->remaining_bits  = (size << 3) - c->frame_bit_len + c->remaining_bits;
 220
 221     return size+2;
 222 }
 223
 224 static int vqf_read_seek(AVFormatContext *s,
 225                          int stream_index, int64_t timestamp, int flags)
 226 {
 227     VqfContext *c = s->priv_data;
 228     AVStream *st;
 229     int ret;
 230     int64_t pos;
 231
 232     st = s->streams[stream_index];
 233     pos = av_rescale_rnd(timestamp * st->codec->bit_rate,
 234                          st->time_base.num,
 235                          st->time_base.den * (int64_t)c->frame_bit_len,
 236                          (flags & AVSEEK_FLAG_BACKWARD) ?
 237                                                    AV_ROUND_DOWN : AV_ROUND_UP);
 238     pos *= c->frame_bit_len;
 239
 240     st->cur_dts = av_rescale(pos, st->time_base.den,
 241                              st->codec->bit_rate * (int64_t)st->time_base.num);
 242
 243     if ((ret = url_fseek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0)
 244         return ret;
 245
 246     c->remaining_bits = -7 - ((pos-7)&7);
 247     return 0;
 248 }
 249
 250 AVInputFormat vqf_demuxer = {
 251     "vqf",
 252     NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
 253     sizeof(VqfContext),
 254     vqf_probe,
 255     vqf_read_header,
 256     vqf_read_packet,
 257     NULL,
 258     vqf_read_seek,
 259     .extensions = "vqf",
 260 };