3 * Copyright (c) 2006 Alex Beregszaszi
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavcodec/get_bits.h"
26 #include "libavutil/dict.h"
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')
43 static int tta_read_header(AVFormatContext *s)
45 TTAContext *c = s->priv_data;
47 int i, channels, bps, samplerate;
48 uint64_t framepos, start_offset;
51 if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
54 start_offset = avio_tell(s->pb);
55 if (avio_rl32(s->pb) != AV_RL32("TTA1"))
56 return -1; // not tta file
58 avio_skip(s->pb, 2); // FIXME: flags
59 channels = avio_rl16(s->pb);
60 bps = avio_rl16(s->pb);
61 samplerate = avio_rl32(s->pb);
62 if(samplerate <= 0 || samplerate > 1000000){
63 av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
67 datalen = avio_rl32(s->pb);
69 av_log(s, AV_LOG_ERROR, "invalid datalen\n");
70 return AVERROR_INVALIDDATA;
73 avio_skip(s->pb, 4); // header crc
75 c->frame_size = samplerate * 256 / 245;
76 c->last_frame_size = datalen % c->frame_size;
77 if (!c->last_frame_size)
78 c->last_frame_size = c->frame_size;
79 c->totalframes = datalen / c->frame_size + (c->last_frame_size < c->frame_size);
82 if(c->totalframes >= UINT_MAX/sizeof(uint32_t) || c->totalframes <= 0){
83 av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes);
87 st = avformat_new_stream(s, NULL);
89 return AVERROR(ENOMEM);
91 avpriv_set_pts_info(st, 64, 1, samplerate);
93 st->duration = datalen;
95 framepos = avio_tell(s->pb) + 4*c->totalframes + 4;
97 for (i = 0; i < c->totalframes; i++) {
98 uint32_t size = avio_rl32(s->pb);
99 av_add_index_entry(st, framepos, i * c->frame_size, size, 0,
103 avio_skip(s->pb, 4); // seektable crc
105 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
106 st->codec->codec_id = AV_CODEC_ID_TTA;
107 st->codec->channels = channels;
108 st->codec->sample_rate = samplerate;
109 st->codec->bits_per_coded_sample = bps;
111 st->codec->extradata_size = avio_tell(s->pb) - start_offset;
112 if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
113 //this check is redundant as avio_read should fail
114 av_log(s, AV_LOG_ERROR, "extradata_size too large\n");
117 st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);
118 if (!st->codec->extradata) {
119 st->codec->extradata_size = 0;
120 return AVERROR(ENOMEM);
122 avio_seek(s->pb, start_offset, SEEK_SET);
123 avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);
128 static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
130 TTAContext *c = s->priv_data;
131 AVStream *st = s->streams[0];
135 if (c->currentframe >= c->totalframes)
138 size = st->index_entries[c->currentframe].size;
140 ret = av_get_packet(s->pb, pkt, size);
141 pkt->dts = st->index_entries[c->currentframe++].timestamp;
142 pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size :
147 static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
149 TTAContext *c = s->priv_data;
150 AVStream *st = s->streams[stream_index];
151 int index = av_index_search_timestamp(st, timestamp, flags);
154 if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
157 c->currentframe = index;
162 AVInputFormat ff_tta_demuxer = {
164 .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
165 .priv_data_size = sizeof(TTAContext),
166 .read_probe = tta_probe,
167 .read_header = tta_read_header,
168 .read_packet = tta_read_packet,
169 .read_seek = tta_read_seek,