3 * Copyright (c) 2006 Alex Beregszaszi
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #define ALT_BITSREAM_READER_LE
21 #include "bitstream.h"
24 int totalframes, currentframe;
28 static int tta_probe(AVProbeData *p)
30 const uint8_t *d = p->buf;
33 if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1')
38 static int tta_read_header(AVFormatContext *s, AVFormatParameters *ap)
40 TTAContext *c = s->priv_data;
42 int i, channels, bps, samplerate, datalen, framelen, start;
44 start = url_ftell(&s->pb);
46 if (get_le32(&s->pb) != ff_get_fourcc("TTA1"))
47 return -1; // not tta file
49 url_fskip(&s->pb, 2); // FIXME: flags
50 channels = get_le16(&s->pb);
51 bps = get_le16(&s->pb);
52 samplerate = get_le32(&s->pb);
53 if(samplerate <= 0 || samplerate > 1000000){
54 av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
58 datalen = get_le32(&s->pb);
60 av_log(s, AV_LOG_ERROR, "nonsense datalen\n");
64 url_fskip(&s->pb, 4); // header crc
66 framelen = 1.04489795918367346939 * samplerate;
67 c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0);
70 if(c->totalframes >= UINT_MAX/sizeof(uint32_t)){
71 av_log(s, AV_LOG_ERROR, "totalframes too large\n");
74 c->seektable = av_mallocz(sizeof(uint32_t)*c->totalframes);
78 for (i = 0; i < c->totalframes; i++)
79 c->seektable[i] = get_le32(&s->pb);
80 url_fskip(&s->pb, 4); // seektable crc
82 st = av_new_stream(s, 0);
83 // av_set_pts_info(st, 32, 1, 1000);
86 st->codec->codec_type = CODEC_TYPE_AUDIO;
87 st->codec->codec_id = CODEC_ID_TTA;
88 st->codec->channels = channels;
89 st->codec->sample_rate = samplerate;
90 st->codec->bits_per_sample = bps;
92 st->codec->extradata_size = url_ftell(&s->pb) - start;
93 if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
94 //this check is redundant as get_buffer should fail
95 av_log(s, AV_LOG_ERROR, "extradata_size too large\n");
98 st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);
99 url_fseek(&s->pb, start, SEEK_SET); // or SEEK_CUR and -size ? :)
100 get_buffer(&s->pb, st->codec->extradata, st->codec->extradata_size);
105 static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
107 TTAContext *c = s->priv_data;
111 if (c->currentframe > c->totalframes)
114 size = c->seektable[c->currentframe];
118 if (av_new_packet(pkt, size) < 0)
121 pkt->pos = url_ftell(&s->pb);
122 pkt->stream_index = 0;
123 ret = get_buffer(&s->pb, pkt->data, size);
129 // av_log(s, AV_LOG_INFO, "TTA packet #%d desired size: %d read size: %d at pos %d\n",
130 // c->currentframe, size, ret, pkt->pos);
134 static int tta_read_close(AVFormatContext *s)
136 TTAContext *c = s->priv_data;
138 av_free(c->seektable);
142 AVInputFormat tta_demuxer = {