1/* 2 * TTA demuxer 3 * Copyright (c) 2006 Alex Beregszaszi 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 "libavcodec/get_bits.h" 23#include "avformat.h" 24#include "internal.h" 25#include "id3v1.h" 26#include "libavutil/dict.h" 27 28typedef struct { 29 int totalframes, currentframe; 30} TTAContext; 31 32static int tta_probe(AVProbeData *p) 33{ 34 const uint8_t *d = p->buf; 35 36 if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1') 37 return 80; 38 return 0; 39} 40 41static int tta_read_header(AVFormatContext *s, AVFormatParameters *ap) 42{ 43 TTAContext *c = s->priv_data; 44 AVStream *st; 45 int i, channels, bps, samplerate, datalen, framelen; 46 uint64_t framepos, start_offset; 47 48 if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) 49 ff_id3v1_read(s); 50 51 start_offset = avio_tell(s->pb); 52 if (avio_rl32(s->pb) != AV_RL32("TTA1")) 53 return -1; // not tta file 54 55 avio_skip(s->pb, 2); // FIXME: flags 56 channels = avio_rl16(s->pb); 57 bps = avio_rl16(s->pb); 58 samplerate = avio_rl32(s->pb); 59 if(samplerate <= 0 || samplerate > 1000000){ 60 av_log(s, AV_LOG_ERROR, "nonsense samplerate\n"); 61 return -1; 62 } 63 64 datalen = avio_rl32(s->pb); 65 if(datalen < 0){ 66 av_log(s, AV_LOG_ERROR, "nonsense datalen\n"); 67 return -1; 68 } 69 70 avio_skip(s->pb, 4); // header crc 71 72 framelen = samplerate*256/245; 73 c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0); 74 c->currentframe = 0; 75 76 if(c->totalframes >= UINT_MAX/sizeof(uint32_t)){ 77 av_log(s, AV_LOG_ERROR, "totalframes too large\n"); 78 return -1; 79 } 80 81 st = avformat_new_stream(s, NULL); 82 if (!st) 83 return AVERROR(ENOMEM); 84 85 avpriv_set_pts_info(st, 64, 1, samplerate); 86 st->start_time = 0; 87 st->duration = datalen; 88 89 framepos = avio_tell(s->pb) + 4*c->totalframes + 4; 90 91 for (i = 0; i < c->totalframes; i++) { 92 uint32_t size = avio_rl32(s->pb); 93 av_add_index_entry(st, framepos, i*framelen, size, 0, AVINDEX_KEYFRAME); 94 framepos += size; 95 } 96 avio_skip(s->pb, 4); // seektable crc 97 98 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 99 st->codec->codec_id = CODEC_ID_TTA; 100 st->codec->channels = channels; 101 st->codec->sample_rate = samplerate; 102 st->codec->bits_per_coded_sample = bps; 103 104 st->codec->extradata_size = avio_tell(s->pb) - start_offset; 105 if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){ 106 //this check is redundant as avio_read should fail 107 av_log(s, AV_LOG_ERROR, "extradata_size too large\n"); 108 return -1; 109 } 110 st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE); 111 if (!st->codec->extradata) { 112 st->codec->extradata_size = 0; 113 return AVERROR(ENOMEM); 114 } 115 avio_seek(s->pb, start_offset, SEEK_SET); 116 avio_read(s->pb, st->codec->extradata, st->codec->extradata_size); 117 118 return 0; 119} 120 121static int tta_read_packet(AVFormatContext *s, AVPacket *pkt) 122{ 123 TTAContext *c = s->priv_data; 124 AVStream *st = s->streams[0]; 125 int size, ret; 126 127 // FIXME! 128 if (c->currentframe >= c->totalframes) 129 return AVERROR_EOF; 130 131 size = st->index_entries[c->currentframe].size; 132 133 ret = av_get_packet(s->pb, pkt, size); 134 pkt->dts = st->index_entries[c->currentframe++].timestamp; 135 return ret; 136} 137 138static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) 139{ 140 TTAContext *c = s->priv_data; 141 AVStream *st = s->streams[stream_index]; 142 int index = av_index_search_timestamp(st, timestamp, flags); 143 if (index < 0) 144 return -1; 145 146 c->currentframe = index; 147 avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET); 148 149 return 0; 150} 151 152AVInputFormat ff_tta_demuxer = { 153 .name = "tta", 154 .long_name = NULL_IF_CONFIG_SMALL("True Audio"), 155 .priv_data_size = sizeof(TTAContext), 156 .read_probe = tta_probe, 157 .read_header = tta_read_header, 158 .read_packet = tta_read_packet, 159 .read_seek = tta_read_seek, 160 .extensions = "tta", 161}; 162