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path: root/libavformat/tta.c (plain)
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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 "libavutil/crc.h"
23#include "libavutil/dict.h"
24#include "libavutil/intreadwrite.h"
25
26#include "apetag.h"
27#include "avformat.h"
28#include "avio_internal.h"
29#include "internal.h"
30#include "id3v1.h"
31
32typedef struct TTAContext {
33 int totalframes, currentframe;
34 int frame_size;
35 int last_frame_size;
36} TTAContext;
37
38static int tta_probe(AVProbeData *p)
39{
40 if (AV_RL32(&p->buf[0]) == MKTAG('T', 'T', 'A', '1') &&
41 (AV_RL16(&p->buf[4]) == 1 || AV_RL16(&p->buf[4]) == 2) &&
42 AV_RL16(&p->buf[6]) > 0 &&
43 AV_RL16(&p->buf[8]) > 0 &&
44 AV_RL32(&p->buf[10]) > 0)
45 return AVPROBE_SCORE_EXTENSION + 30;
46 return 0;
47}
48
49static int tta_read_header(AVFormatContext *s)
50{
51 TTAContext *c = s->priv_data;
52 AVStream *st;
53 int i, channels, bps, samplerate;
54 int64_t framepos, start_offset;
55 uint32_t nb_samples, crc;
56
57 ff_id3v1_read(s);
58
59 start_offset = avio_tell(s->pb);
60 if (start_offset < 0)
61 return start_offset;
62 ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
63 if (avio_rl32(s->pb) != AV_RL32("TTA1"))
64 return AVERROR_INVALIDDATA;
65
66 avio_skip(s->pb, 2); // FIXME: flags
67 channels = avio_rl16(s->pb);
68 bps = avio_rl16(s->pb);
69 samplerate = avio_rl32(s->pb);
70 if(samplerate <= 0 || samplerate > 1000000){
71 av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
72 return AVERROR_INVALIDDATA;
73 }
74
75 nb_samples = avio_rl32(s->pb);
76 if (!nb_samples) {
77 av_log(s, AV_LOG_ERROR, "invalid number of samples\n");
78 return AVERROR_INVALIDDATA;
79 }
80
81 crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
82 if (crc != avio_rl32(s->pb) && s->error_recognition & AV_EF_CRCCHECK) {
83 av_log(s, AV_LOG_ERROR, "Header CRC error\n");
84 return AVERROR_INVALIDDATA;
85 }
86
87 c->frame_size = samplerate * 256 / 245;
88 c->last_frame_size = nb_samples % c->frame_size;
89 if (!c->last_frame_size)
90 c->last_frame_size = c->frame_size;
91 c->totalframes = nb_samples / c->frame_size + (c->last_frame_size < c->frame_size);
92 c->currentframe = 0;
93
94 if(c->totalframes >= UINT_MAX/sizeof(uint32_t) || c->totalframes <= 0){
95 av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes);
96 return AVERROR_INVALIDDATA;
97 }
98
99 st = avformat_new_stream(s, NULL);
100 if (!st)
101 return AVERROR(ENOMEM);
102
103 avpriv_set_pts_info(st, 64, 1, samplerate);
104 st->start_time = 0;
105 st->duration = nb_samples;
106
107 framepos = avio_tell(s->pb);
108 if (framepos < 0)
109 return framepos;
110 framepos += 4 * c->totalframes + 4;
111
112 if (ff_alloc_extradata(st->codecpar, 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->codecpar->extradata, st->codecpar->extradata_size);
117
118 ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
119 for (i = 0; i < c->totalframes; i++) {
120 uint32_t size = avio_rl32(s->pb);
121 int r;
122 if ((r = av_add_index_entry(st, framepos, i * c->frame_size, size, 0,
123 AVINDEX_KEYFRAME)) < 0)
124 return r;
125 framepos += size;
126 }
127 crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
128 if (crc != avio_rl32(s->pb) && s->error_recognition & AV_EF_CRCCHECK) {
129 av_log(s, AV_LOG_ERROR, "Seek table CRC error\n");
130 return AVERROR_INVALIDDATA;
131 }
132
133 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
134 st->codecpar->codec_id = AV_CODEC_ID_TTA;
135 st->codecpar->channels = channels;
136 st->codecpar->sample_rate = samplerate;
137 st->codecpar->bits_per_coded_sample = bps;
138
139 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
140 int64_t pos = avio_tell(s->pb);
141 ff_ape_parse_tag(s);
142 avio_seek(s->pb, pos, SEEK_SET);
143 }
144
145 return 0;
146}
147
148static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
149{
150 TTAContext *c = s->priv_data;
151 AVStream *st = s->streams[0];
152 int size, ret;
153
154 // FIXME!
155 if (c->currentframe >= c->totalframes)
156 return AVERROR_EOF;
157
158 if (st->nb_index_entries < c->totalframes) {
159 av_log(s, AV_LOG_ERROR, "Index entry disappeared\n");
160 return AVERROR_INVALIDDATA;
161 }
162
163 size = st->index_entries[c->currentframe].size;
164
165 ret = av_get_packet(s->pb, pkt, size);
166 pkt->dts = st->index_entries[c->currentframe++].timestamp;
167 pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size :
168 c->frame_size;
169 return ret;
170}
171
172static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
173{
174 TTAContext *c = s->priv_data;
175 AVStream *st = s->streams[stream_index];
176 int index = av_index_search_timestamp(st, timestamp, flags);
177 if (index < 0)
178 return -1;
179 if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
180 return -1;
181
182 c->currentframe = index;
183
184 return 0;
185}
186
187AVInputFormat ff_tta_demuxer = {
188 .name = "tta",
189 .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
190 .priv_data_size = sizeof(TTAContext),
191 .read_probe = tta_probe,
192 .read_header = tta_read_header,
193 .read_packet = tta_read_packet,
194 .read_seek = tta_read_seek,
195 .extensions = "tta",
196};
197
generated by cgit at 2024-05-17 18:36:24 (GMT)