libavformat/tta.c

   1 /*
   2  * TTA demuxer
   3  * Copyright (c) 2006 Alex Beregszaszi
   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 "libavutil/crc.h"
  23 #include "libavutil/dict.h"
  24 #include "libavutil/intreadwrite.h"
  25
  26 #include "apetag.h"
  27 #include "avformat.h"
  28 #include "avio_internal.h"
  29 #include "internal.h"
  30 #include "id3v1.h"
  31
  32 typedef struct TTAContext {
  33     int totalframes, currentframe;
  34     int frame_size;
  35     int last_frame_size;
  36 } TTAContext;
  37
  38 static int tta_probe(const AVProbeData *p)
  39 {
  40     if (AV_RL32(&p->buf[0]) == MKTAG('T', 'T', 'A', '1') &&
  41         (AV_RL16(&p->buf[4]) == 1 || AV_RL16(&p->buf[4]) == 2) &&
  42         AV_RL16(&p->buf[6]) > 0 &&
  43         AV_RL16(&p->buf[8]) > 0 &&
  44         AV_RL32(&p->buf[10]) > 0)
  45         return AVPROBE_SCORE_EXTENSION + 30;
  46     return 0;
  47 }
  48
  49 static int tta_read_header(AVFormatContext *s)
  50 {
  51     TTAContext *c = s->priv_data;
  52     AVStream *st;
  53     int i, channels, bps, samplerate;
  54     int64_t framepos, start_offset;
  55     uint32_t nb_samples, crc;
  56
  57     ff_id3v1_read(s);
  58
  59     start_offset = avio_tell(s->pb);
  60     if (start_offset < 0)
  61         return start_offset;
  62     ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
  63     if (avio_rl32(s->pb) != AV_RL32("TTA1"))
  64         return AVERROR_INVALIDDATA;
  65
  66     avio_skip(s->pb, 2); // FIXME: flags
  67     channels = avio_rl16(s->pb);
  68     bps = avio_rl16(s->pb);
  69     samplerate = avio_rl32(s->pb);
  70     if(samplerate <= 0 || samplerate > 1000000){
  71         av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
  72         return AVERROR_INVALIDDATA;
  73     }
  74
  75     nb_samples = avio_rl32(s->pb);
  76     if (!nb_samples) {
  77         av_log(s, AV_LOG_ERROR, "invalid number of samples\n");
  78         return AVERROR_INVALIDDATA;
  79     }
  80
  81     crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
  82     if (crc != avio_rl32(s->pb) && s->error_recognition & AV_EF_CRCCHECK) {
  83         av_log(s, AV_LOG_ERROR, "Header CRC error\n");
  84         return AVERROR_INVALIDDATA;
  85     }
  86
  87     c->frame_size      = samplerate * 256 / 245;
  88     c->last_frame_size = nb_samples % c->frame_size;
  89     if (!c->last_frame_size)
  90         c->last_frame_size = c->frame_size;
  91     c->totalframes = nb_samples / c->frame_size + (c->last_frame_size < c->frame_size);
  92     c->currentframe = 0;
  93
  94     if(c->totalframes >= (INT_MAX - 4)/sizeof(uint32_t) || c->totalframes <= 0){
  95         av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes);
  96         return AVERROR_INVALIDDATA;
  97     }
  98
  99     st = avformat_new_stream(s, NULL);
 100     if (!st)
 101         return AVERROR(ENOMEM);
 102
 103     avpriv_set_pts_info(st, 64, 1, samplerate);
 104     st->start_time = 0;
 105     st->duration = nb_samples;
 106
 107     framepos = avio_tell(s->pb);
 108     if (framepos < 0)
 109         return framepos;
 110     framepos += 4 * c->totalframes + 4;
 111
 112     if (ff_alloc_extradata(st->codecpar, avio_tell(s->pb) - start_offset))
 113         return AVERROR(ENOMEM);
 114
 115     avio_seek(s->pb, start_offset, SEEK_SET);
 116     avio_read(s->pb, st->codecpar->extradata, st->codecpar->extradata_size);
 117
 118     ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
 119     for (i = 0; i < c->totalframes; i++) {
 120         uint32_t size = avio_rl32(s->pb);
 121         int r;
 122         if (avio_feof(s->pb))
 123             return AVERROR_INVALIDDATA;
 124         if ((r = av_add_index_entry(st, framepos, i * (int64_t)c->frame_size, size, 0,
 125                                     AVINDEX_KEYFRAME)) < 0)
 126             return r;
 127         framepos += size;
 128     }
 129     crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
 130     if (crc != avio_rl32(s->pb) && s->error_recognition & AV_EF_CRCCHECK) {
 131         av_log(s, AV_LOG_ERROR, "Seek table CRC error\n");
 132         return AVERROR_INVALIDDATA;
 133     }
 134
 135     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
 136     st->codecpar->codec_id = AV_CODEC_ID_TTA;
 137     st->codecpar->channels = channels;
 138     st->codecpar->sample_rate = samplerate;
 139     st->codecpar->bits_per_coded_sample = bps;
 140
 141     if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
 142         int64_t pos = avio_tell(s->pb);
 143         ff_ape_parse_tag(s);
 144         avio_seek(s->pb, pos, SEEK_SET);
 145     }
 146
 147     return 0;
 148 }
 149
 150 static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
 151 {
 152     TTAContext *c = s->priv_data;
 153     AVStream *st = s->streams[0];
 154     int size, ret;
 155
 156     // FIXME!
 157     if (c->currentframe >= c->totalframes)
 158         return AVERROR_EOF;
 159
 160     if (st->nb_index_entries < c->totalframes) {
 161         av_log(s, AV_LOG_ERROR, "Index entry disappeared\n");
 162         return AVERROR_INVALIDDATA;
 163     }
 164
 165     size = st->index_entries[c->currentframe].size;
 166
 167     ret = av_get_packet(s->pb, pkt, size);
 168     pkt->dts = st->index_entries[c->currentframe++].timestamp;
 169     pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size :
 170                                                         c->frame_size;
 171     return ret;
 172 }
 173
 174 static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
 175 {
 176     TTAContext *c = s->priv_data;
 177     AVStream *st = s->streams[stream_index];
 178     int index = av_index_search_timestamp(st, timestamp, flags);
 179     if (index < 0)
 180         return -1;
 181     if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
 182         return -1;
 183
 184     c->currentframe = index;
 185
 186     return 0;
 187 }
 188
 189 AVInputFormat ff_tta_demuxer = {
 190     .name           = "tta",
 191     .long_name      = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
 192     .priv_data_size = sizeof(TTAContext),
 193     .read_probe     = tta_probe,
 194     .read_header    = tta_read_header,
 195     .read_packet    = tta_read_packet,
 196     .read_seek      = tta_read_seek,
 197     .extensions     = "tta",
 198 };