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