Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavformat / tta.c
... / ...
CommitLineData
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/get_bits.h"
23#include "apetag.h"
24#include "avformat.h"
25#include "avio_internal.h"
26#include "internal.h"
27#include "id3v1.h"
28#include "libavutil/crc.h"
29#include "libavutil/dict.h"
30
31typedef struct {
32 int totalframes, currentframe;
33 int frame_size;
34 int last_frame_size;
35} TTAContext;
36
37static unsigned long tta_check_crc(unsigned long checksum, const uint8_t *buf,
38 unsigned int len)
39{
40 return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
41}
42
43static int tta_probe(AVProbeData *p)
44{
45 if (AV_RL32(&p->buf[0]) == MKTAG('T', 'T', 'A', '1') &&
46 (AV_RL16(&p->buf[4]) == 1 || AV_RL16(&p->buf[4]) == 2) &&
47 AV_RL16(&p->buf[6]) > 0 &&
48 AV_RL16(&p->buf[8]) > 0 &&
49 AV_RL32(&p->buf[10]) > 0)
50 return AVPROBE_SCORE_EXTENSION + 30;
51 return 0;
52}
53
54static int tta_read_header(AVFormatContext *s)
55{
56 TTAContext *c = s->priv_data;
57 AVStream *st;
58 int i, channels, bps, samplerate;
59 uint64_t framepos, start_offset;
60 uint32_t nb_samples, crc;
61
62 ff_id3v1_read(s);
63
64 start_offset = avio_tell(s->pb);
65 ffio_init_checksum(s->pb, tta_check_crc, UINT32_MAX);
66 if (avio_rl32(s->pb) != AV_RL32("TTA1"))
67 return AVERROR_INVALIDDATA;
68
69 avio_skip(s->pb, 2); // FIXME: flags
70 channels = avio_rl16(s->pb);
71 bps = avio_rl16(s->pb);
72 samplerate = avio_rl32(s->pb);
73 if(samplerate <= 0 || samplerate > 1000000){
74 av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
75 return AVERROR_INVALIDDATA;
76 }
77
78 nb_samples = avio_rl32(s->pb);
79 if (!nb_samples) {
80 av_log(s, AV_LOG_ERROR, "invalid number of samples\n");
81 return AVERROR_INVALIDDATA;
82 }
83
84 crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
85 if (crc != avio_rl32(s->pb)) {
86 av_log(s, AV_LOG_ERROR, "Header CRC error\n");
87 return AVERROR_INVALIDDATA;
88 }
89
90 c->frame_size = samplerate * 256 / 245;
91 c->last_frame_size = nb_samples % c->frame_size;
92 if (!c->last_frame_size)
93 c->last_frame_size = c->frame_size;
94 c->totalframes = nb_samples / c->frame_size + (c->last_frame_size < c->frame_size);
95 c->currentframe = 0;
96
97 if(c->totalframes >= UINT_MAX/sizeof(uint32_t) || c->totalframes <= 0){
98 av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes);
99 return AVERROR_INVALIDDATA;
100 }
101
102 st = avformat_new_stream(s, NULL);
103 if (!st)
104 return AVERROR(ENOMEM);
105
106 avpriv_set_pts_info(st, 64, 1, samplerate);
107 st->start_time = 0;
108 st->duration = nb_samples;
109
110 framepos = avio_tell(s->pb) + 4*c->totalframes + 4;
111
112 if (ff_alloc_extradata(st->codec, 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->codec->extradata, st->codec->extradata_size);
117
118 ffio_init_checksum(s->pb, tta_check_crc, UINT32_MAX);
119 for (i = 0; i < c->totalframes; i++) {
120 uint32_t size = avio_rl32(s->pb);
121 av_add_index_entry(st, framepos, i * c->frame_size, size, 0,
122 AVINDEX_KEYFRAME);
123 framepos += size;
124 }
125 crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
126 if (crc != avio_rl32(s->pb)) {
127 av_log(s, AV_LOG_ERROR, "Seek table CRC error\n");
128 return AVERROR_INVALIDDATA;
129 }
130
131 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
132 st->codec->codec_id = AV_CODEC_ID_TTA;
133 st->codec->channels = channels;
134 st->codec->sample_rate = samplerate;
135 st->codec->bits_per_coded_sample = bps;
136
137 if (s->pb->seekable) {
138 int64_t pos = avio_tell(s->pb);
139 ff_ape_parse_tag(s);
140 avio_seek(s->pb, pos, SEEK_SET);
141 }
142
143 return 0;
144}
145
146static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
147{
148 TTAContext *c = s->priv_data;
149 AVStream *st = s->streams[0];
150 int size, ret;
151
152 // FIXME!
153 if (c->currentframe >= c->totalframes)
154 return AVERROR_EOF;
155
156 size = st->index_entries[c->currentframe].size;
157
158 ret = av_get_packet(s->pb, pkt, size);
159 pkt->dts = st->index_entries[c->currentframe++].timestamp;
160 pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size :
161 c->frame_size;
162 return ret;
163}
164
165static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
166{
167 TTAContext *c = s->priv_data;
168 AVStream *st = s->streams[stream_index];
169 int index = av_index_search_timestamp(st, timestamp, flags);
170 if (index < 0)
171 return -1;
172 if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
173 return -1;
174
175 c->currentframe = index;
176
177 return 0;
178}
179
180AVInputFormat ff_tta_demuxer = {
181 .name = "tta",
182 .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
183 .priv_data_size = sizeof(TTAContext),
184 .read_probe = tta_probe,
185 .read_header = tta_read_header,
186 .read_packet = tta_read_packet,
187 .read_seek = tta_read_seek,
188 .extensions = "tta",
189};