Statistics
| Branch: | Revision:

ffmpeg / libavformat / tta.c @ a23c9c4a

History | View | Annotate | Download (4.19 KB)

1 aafaeabb Alex Beregszaszi
/*
2
 * TTA demuxer
3
 * Copyright (c) 2006 Alex Beregszaszi
4
 *
5 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8 aafaeabb Alex Beregszaszi
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
11 aafaeabb Alex Beregszaszi
 *
12 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
13 aafaeabb Alex Beregszaszi
 * 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 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
19 e5a389a1 Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 aafaeabb Alex Beregszaszi
 */
21
#include "avformat.h"
22
#include "bitstream.h"
23
24
typedef struct {
25
    int totalframes, currentframe;
26
} TTAContext;
27
28
static int tta_probe(AVProbeData *p)
29
{
30
    const uint8_t *d = p->buf;
31
    if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1')
32
        return 80;
33
    return 0;
34
}
35
36
static int tta_read_header(AVFormatContext *s, AVFormatParameters *ap)
37
{
38
    TTAContext *c = s->priv_data;
39
    AVStream *st;
40 09a62866 Michael Niedermayer
    int i, channels, bps, samplerate, datalen, framelen;
41 756fb7fe David Conrad
    uint64_t framepos;
42 aafaeabb Alex Beregszaszi
43 899681cd Björn Axelsson
    if (get_le32(s->pb) != ff_get_fourcc("TTA1"))
44 aafaeabb Alex Beregszaszi
        return -1; // not tta file
45
46 899681cd Björn Axelsson
    url_fskip(s->pb, 2); // FIXME: flags
47
    channels = get_le16(s->pb);
48
    bps = get_le16(s->pb);
49
    samplerate = get_le32(s->pb);
50 a443a253 Michael Niedermayer
    if(samplerate <= 0 || samplerate > 1000000){
51
        av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
52
        return -1;
53
    }
54
55 899681cd Björn Axelsson
    datalen = get_le32(s->pb);
56 a443a253 Michael Niedermayer
    if(datalen < 0){
57
        av_log(s, AV_LOG_ERROR, "nonsense datalen\n");
58
        return -1;
59
    }
60
61 899681cd Björn Axelsson
    url_fskip(s->pb, 4); // header crc
62 aafaeabb Alex Beregszaszi
63 dc417a6e Michael Niedermayer
    framelen = samplerate*256/245;
64 aafaeabb Alex Beregszaszi
    c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0);
65
    c->currentframe = 0;
66
67 a443a253 Michael Niedermayer
    if(c->totalframes >= UINT_MAX/sizeof(uint32_t)){
68
        av_log(s, AV_LOG_ERROR, "totalframes too large\n");
69
        return -1;
70
    }
71 aafaeabb Alex Beregszaszi
72
    st = av_new_stream(s, 0);
73
    if (!st)
74 769e10f0 Panagiotis Issaris
        return AVERROR(ENOMEM);
75 756fb7fe David Conrad
76
    av_set_pts_info(st, 64, 1, samplerate);
77
    st->start_time = 0;
78
    st->duration = datalen;
79
80 899681cd Björn Axelsson
    framepos = url_ftell(s->pb) + 4*c->totalframes + 4;
81 756fb7fe David Conrad
82
    for (i = 0; i < c->totalframes; i++) {
83 899681cd Björn Axelsson
        uint32_t size = get_le32(s->pb);
84 756fb7fe David Conrad
        av_add_index_entry(st, framepos, i*framelen, size, 0, AVINDEX_KEYFRAME);
85
        framepos += size;
86
    }
87 899681cd Björn Axelsson
    url_fskip(s->pb, 4); // seektable crc
88 756fb7fe David Conrad
89 aafaeabb Alex Beregszaszi
    st->codec->codec_type = CODEC_TYPE_AUDIO;
90
    st->codec->codec_id = CODEC_ID_TTA;
91
    st->codec->channels = channels;
92
    st->codec->sample_rate = samplerate;
93
    st->codec->bits_per_sample = bps;
94
95 899681cd Björn Axelsson
    st->codec->extradata_size = url_ftell(s->pb);
96 a443a253 Michael Niedermayer
    if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
97
        //this check is redundant as get_buffer should fail
98
        av_log(s, AV_LOG_ERROR, "extradata_size too large\n");
99
        return -1;
100
    }
101 aa11db2f Alex Beregszaszi
    st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);
102 899681cd Björn Axelsson
    url_fseek(s->pb, 0, SEEK_SET);
103
    get_buffer(s->pb, st->codec->extradata, st->codec->extradata_size);
104 aafaeabb Alex Beregszaszi
105
    return 0;
106
}
107
108
static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
109
{
110
    TTAContext *c = s->priv_data;
111 756fb7fe David Conrad
    AVStream *st = s->streams[0];
112 160ab30f David Conrad
    int size, ret;
113 aafaeabb Alex Beregszaszi
114
    // FIXME!
115
    if (c->currentframe > c->totalframes)
116 756fb7fe David Conrad
        return -1;
117 aafaeabb Alex Beregszaszi
118 160ab30f David Conrad
    size = st->index_entries[c->currentframe].size;
119 aafaeabb Alex Beregszaszi
120 899681cd Björn Axelsson
    ret = av_get_packet(s->pb, pkt, size);
121 160ab30f David Conrad
    pkt->dts = st->index_entries[c->currentframe++].timestamp;
122
    return ret;
123 aafaeabb Alex Beregszaszi
}
124
125 70fa2486 David Conrad
static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
126
{
127
    TTAContext *c = s->priv_data;
128
    AVStream *st = s->streams[stream_index];
129
    int index = av_index_search_timestamp(st, timestamp, flags);
130
    if (index < 0)
131
        return -1;
132
133
    c->currentframe = index;
134 899681cd Björn Axelsson
    url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
135 70fa2486 David Conrad
136
    return 0;
137
}
138
139 d2a067d1 Måns Rullgård
AVInputFormat tta_demuxer = {
140 aafaeabb Alex Beregszaszi
    "tta",
141
    "true-audio",
142
    sizeof(TTAContext),
143
    tta_probe,
144
    tta_read_header,
145
    tta_read_packet,
146 756fb7fe David Conrad
    NULL,
147 70fa2486 David Conrad
    tta_read_seek,
148 aafaeabb Alex Beregszaszi
    .extensions = "tta",
149
};