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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 | ||
31 | typedef struct { | |
32 | int totalframes, currentframe; | |
33 | int frame_size; | |
34 | int last_frame_size; | |
35 | } TTAContext; | |
36 | ||
37 | static 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 | ||
43 | static 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 | ||
54 | static 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 | ||
146 | static 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 | ||
165 | static 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 | ||
180 | AVInputFormat 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 | }; |