3 * Copyright (c) 2006 Alex Beregszaszi
5 * This file is part of Libav.
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.
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.
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
22 #include "libavcodec/get_bits.h"
26 #include "libavutil/dict.h"
28 typedef struct TTAContext {
29 int totalframes, currentframe;
34 static int tta_probe(AVProbeData *p)
36 const uint8_t *d = p->buf;
38 if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1')
39 return AVPROBE_SCORE_EXTENSION + 30;
43 static int tta_read_header(AVFormatContext *s)
45 TTAContext *c = s->priv_data;
47 int i, channels, bps, samplerate, datalen;
48 int64_t framepos, start_offset;
50 if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
53 start_offset = avio_tell(s->pb);
56 if (avio_rl32(s->pb) != AV_RL32("TTA1"))
57 return -1; // not tta file
59 avio_skip(s->pb, 2); // FIXME: flags
60 channels = avio_rl16(s->pb);
61 bps = avio_rl16(s->pb);
62 samplerate = avio_rl32(s->pb);
63 if(samplerate <= 0 || samplerate > 1000000){
64 av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
68 datalen = avio_rl32(s->pb);
70 av_log(s, AV_LOG_ERROR, "nonsense datalen\n");
74 avio_skip(s->pb, 4); // header crc
76 c->frame_size = samplerate * 256 / 245;
77 c->last_frame_size = datalen % c->frame_size;
78 if (!c->last_frame_size)
79 c->last_frame_size = c->frame_size;
80 c->totalframes = datalen / c->frame_size + (c->last_frame_size < c->frame_size);
83 if(c->totalframes >= UINT_MAX/sizeof(uint32_t)){
84 av_log(s, AV_LOG_ERROR, "totalframes too large\n");
88 st = avformat_new_stream(s, NULL);
90 return AVERROR(ENOMEM);
92 avpriv_set_pts_info(st, 64, 1, samplerate);
94 st->duration = datalen;
96 framepos = avio_tell(s->pb);
99 framepos += 4 * c->totalframes + 4;
101 for (i = 0; i < c->totalframes; i++) {
102 uint32_t size = avio_rl32(s->pb);
103 av_add_index_entry(st, framepos, i * c->frame_size, size, 0,
107 avio_skip(s->pb, 4); // seektable crc
109 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
110 st->codec->codec_id = AV_CODEC_ID_TTA;
111 st->codec->channels = channels;
112 st->codec->sample_rate = samplerate;
113 st->codec->bits_per_coded_sample = bps;
115 st->codec->extradata_size = avio_tell(s->pb) - start_offset;
116 if(st->codec->extradata_size+AV_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
117 //this check is redundant as avio_read should fail
118 av_log(s, AV_LOG_ERROR, "extradata_size too large\n");
121 st->codec->extradata = av_mallocz(st->codec->extradata_size+AV_INPUT_BUFFER_PADDING_SIZE);
122 if (!st->codec->extradata) {
123 st->codec->extradata_size = 0;
124 return AVERROR(ENOMEM);
126 avio_seek(s->pb, start_offset, SEEK_SET);
127 avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);
132 static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
134 TTAContext *c = s->priv_data;
135 AVStream *st = s->streams[0];
139 if (c->currentframe >= c->totalframes)
142 size = st->index_entries[c->currentframe].size;
144 ret = av_get_packet(s->pb, pkt, size);
145 pkt->dts = st->index_entries[c->currentframe++].timestamp;
146 pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size :
151 static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
153 TTAContext *c = s->priv_data;
154 AVStream *st = s->streams[stream_index];
155 int index = av_index_search_timestamp(st, timestamp, flags);
158 if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
161 c->currentframe = index;
166 AVInputFormat ff_tta_demuxer = {
168 .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
169 .priv_data_size = sizeof(TTAContext),
170 .read_probe = tta_probe,
171 .read_header = tta_read_header,
172 .read_packet = tta_read_packet,
173 .read_seek = tta_read_seek,