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 "libavcodec/bitstream.h" 23#include "avformat.h" 24 25typedef struct { 26 int totalframes, currentframe; 27} TTAContext; 28 29static int tta_probe(AVProbeData *p) 30{ 31 const uint8_t *d = p->buf; 32 if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1') 33 return 80; 34 return 0; 35} 36 37static int tta_read_header(AVFormatContext *s, AVFormatParameters *ap) 38{ 39 TTAContext *c = s->priv_data; 40 AVStream *st; 41 int i, channels, bps, samplerate, datalen, framelen; 42 uint64_t framepos; 43 44 if (get_le32(s->pb) != AV_RL32("TTA1")) 45 return -1; // not tta file 46 47 url_fskip(s->pb, 2); // FIXME: flags 48 channels = get_le16(s->pb); 49 bps = get_le16(s->pb); 50 samplerate = get_le32(s->pb); 51 if(samplerate <= 0 || samplerate > 1000000){ 52 av_log(s, AV_LOG_ERROR, "nonsense samplerate\n"); 53 return -1; 54 } 55 56 datalen = get_le32(s->pb); 57 if(datalen < 0){ 58 av_log(s, AV_LOG_ERROR, "nonsense datalen\n"); 59 return -1; 60 } 61 62 url_fskip(s->pb, 4); // header crc 63 64 framelen = samplerate*256/245; 65 c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0); 66 c->currentframe = 0; 67 68 if(c->totalframes >= UINT_MAX/sizeof(uint32_t)){ 69 av_log(s, AV_LOG_ERROR, "totalframes too large\n"); 70 return -1; 71 } 72 73 st = av_new_stream(s, 0); 74 if (!st) 75 return AVERROR(ENOMEM); 76 77 av_set_pts_info(st, 64, 1, samplerate); 78 st->start_time = 0; 79 st->duration = datalen; 80 81 framepos = url_ftell(s->pb) + 4*c->totalframes + 4; 82 83 for (i = 0; i < c->totalframes; i++) { 84 uint32_t size = get_le32(s->pb); 85 av_add_index_entry(st, framepos, i*framelen, size, 0, AVINDEX_KEYFRAME); 86 framepos += size; 87 } 88 url_fskip(s->pb, 4); // seektable crc 89 90 st->codec->codec_type = CODEC_TYPE_AUDIO; 91 st->codec->codec_id = CODEC_ID_TTA; 92 st->codec->channels = channels; 93 st->codec->sample_rate = samplerate; 94 st->codec->bits_per_coded_sample = bps; 95 96 st->codec->extradata_size = url_ftell(s->pb); 97 if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){ 98 //this check is redundant as get_buffer should fail 99 av_log(s, AV_LOG_ERROR, "extradata_size too large\n"); 100 return -1; 101 } 102 st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE); 103 url_fseek(s->pb, 0, SEEK_SET); 104 get_buffer(s->pb, st->codec->extradata, st->codec->extradata_size); 105 106 return 0; 107} 108 109static int tta_read_packet(AVFormatContext *s, AVPacket *pkt) 110{ 111 TTAContext *c = s->priv_data; 112 AVStream *st = s->streams[0]; 113 int size, ret; 114 115 // FIXME! 116 if (c->currentframe > c->totalframes) 117 return -1; 118 119 size = st->index_entries[c->currentframe].size; 120 121 ret = av_get_packet(s->pb, pkt, size); 122 pkt->dts = st->index_entries[c->currentframe++].timestamp; 123 return ret; 124} 125 126static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) 127{ 128 TTAContext *c = s->priv_data; 129 AVStream *st = s->streams[stream_index]; 130 int index = av_index_search_timestamp(st, timestamp, flags); 131 if (index < 0) 132 return -1; 133 134 c->currentframe = index; 135 url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET); 136 137 return 0; 138} 139 140AVInputFormat tta_demuxer = { 141 "tta", 142 NULL_IF_CONFIG_SMALL("True Audio"), 143 sizeof(TTAContext), 144 tta_probe, 145 tta_read_header, 146 tta_read_packet, 147 NULL, 148 tta_read_seek, 149 .extensions = "tta", 150}; 151