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 32typedef struct TTAContext { 33 int totalframes, currentframe; 34 int frame_size; 35 int last_frame_size; 36} TTAContext; 37 38static 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 49static 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->ch_layout.nb_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 150static int tta_read_packet(AVFormatContext *s, AVPacket *pkt) 151{ 152 TTAContext *c = s->priv_data; 153 AVStream *st = s->streams[0]; 154 FFStream *const sti = ffstream(st); 155 int size, ret; 156 157 // FIXME! 158 if (c->currentframe >= c->totalframes) 159 return AVERROR_EOF; 160 161 if (sti->nb_index_entries < c->totalframes) { 162 av_log(s, AV_LOG_ERROR, "Index entry disappeared\n"); 163 return AVERROR_INVALIDDATA; 164 } 165 166 size = sti->index_entries[c->currentframe].size; 167 168 ret = av_get_packet(s->pb, pkt, size); 169 pkt->dts = sti->index_entries[c->currentframe++].timestamp; 170 pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size : 171 c->frame_size; 172 return ret; 173} 174 175static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) 176{ 177 TTAContext *c = s->priv_data; 178 AVStream *st = s->streams[stream_index]; 179 int index = av_index_search_timestamp(st, timestamp, flags); 180 if (index < 0) 181 return -1; 182 if (avio_seek(s->pb, ffstream(st)->index_entries[index].pos, SEEK_SET) < 0) 183 return -1; 184 185 c->currentframe = index; 186 187 return 0; 188} 189 190const AVInputFormat ff_tta_demuxer = { 191 .name = "tta", 192 .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"), 193 .priv_data_size = sizeof(TTAContext), 194 .read_probe = tta_probe, 195 .read_header = tta_read_header, 196 .read_packet = tta_read_packet, 197 .read_seek = tta_read_seek, 198 .extensions = "tta", 199}; 200