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 "bitstream.h"
25 int totalframes, currentframe;
28 static int tta_probe(AVProbeData *p)
30 const uint8_t *d = p->buf;
31 if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1')
36 static int tta_read_header(AVFormatContext *s, AVFormatParameters *ap)
38 TTAContext *c = s->priv_data;
40 int i, channels, bps, samplerate, datalen, framelen;
43 if (get_le32(&s->pb) != ff_get_fourcc("TTA1"))
44 return -1; // not tta file
46 url_fskip(&s->pb, 2); // FIXME: flags
47 channels = get_le16(&s->pb);
48 bps = get_le16(&s->pb);
49 samplerate = get_le32(&s->pb);
50 if(samplerate <= 0 || samplerate > 1000000){
51 av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
55 datalen = get_le32(&s->pb);
57 av_log(s, AV_LOG_ERROR, "nonsense datalen\n");
61 url_fskip(&s->pb, 4); // header crc
63 framelen = samplerate*256/245;
64 c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0);
67 if(c->totalframes >= UINT_MAX/sizeof(uint32_t)){
68 av_log(s, AV_LOG_ERROR, "totalframes too large\n");
72 st = av_new_stream(s, 0);
76 av_set_pts_info(st, 64, 1, samplerate);
78 st->duration = datalen;
80 framepos = url_ftell(&s->pb) + 4*c->totalframes + 4;
82 for (i = 0; i < c->totalframes; i++) {
83 uint32_t size = get_le32(&s->pb);
84 av_add_index_entry(st, framepos, i*framelen, size, 0, AVINDEX_KEYFRAME);
87 url_fskip(&s->pb, 4); // seektable crc
89 st->codec->codec_type = CODEC_TYPE_AUDIO;
90 st->codec->codec_id = CODEC_ID_TTA;
91 st->codec->channels = channels;
92 st->codec->sample_rate = samplerate;
93 st->codec->bits_per_sample = bps;
95 st->codec->extradata_size = url_ftell(&s->pb);
96 if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
97 //this check is redundant as get_buffer should fail
98 av_log(s, AV_LOG_ERROR, "extradata_size too large\n");
101 st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);
102 url_fseek(&s->pb, 0, SEEK_SET);
103 get_buffer(&s->pb, st->codec->extradata, st->codec->extradata_size);
108 static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
110 TTAContext *c = s->priv_data;
111 AVStream *st = s->streams[0];
115 if (c->currentframe > c->totalframes)
118 size = st->index_entries[c->currentframe++].size;
120 return av_get_packet(&s->pb, pkt, size);
123 static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
125 TTAContext *c = s->priv_data;
126 AVStream *st = s->streams[stream_index];
127 int index = av_index_search_timestamp(st, timestamp, flags);
131 c->currentframe = index;
132 url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET);
137 AVInputFormat tta_demuxer = {