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 St, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "bitstream.h"
25 int totalframes, currentframe;
29 static int tta_probe(AVProbeData *p)
31 const uint8_t *d = p->buf;
34 if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1')
39 static int tta_read_header(AVFormatContext *s, AVFormatParameters *ap)
41 TTAContext *c = s->priv_data;
43 int i, channels, bps, samplerate, datalen, framelen, start;
45 start = url_ftell(&s->pb);
47 if (get_le32(&s->pb) != ff_get_fourcc("TTA1"))
48 return -1; // not tta file
50 url_fskip(&s->pb, 2); // FIXME: flags
51 channels = get_le16(&s->pb);
52 bps = get_le16(&s->pb);
53 samplerate = get_le32(&s->pb);
54 if(samplerate <= 0 || samplerate > 1000000){
55 av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
59 datalen = get_le32(&s->pb);
61 av_log(s, AV_LOG_ERROR, "nonsense datalen\n");
65 url_fskip(&s->pb, 4); // header crc
67 framelen = 1.04489795918367346939 * samplerate;
68 c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0);
71 if(c->totalframes >= UINT_MAX/sizeof(uint32_t)){
72 av_log(s, AV_LOG_ERROR, "totalframes too large\n");
75 c->seektable = av_mallocz(sizeof(uint32_t)*c->totalframes);
79 for (i = 0; i < c->totalframes; i++)
80 c->seektable[i] = get_le32(&s->pb);
81 url_fskip(&s->pb, 4); // seektable crc
83 st = av_new_stream(s, 0);
84 // av_set_pts_info(st, 32, 1, 1000);
87 st->codec->codec_type = CODEC_TYPE_AUDIO;
88 st->codec->codec_id = CODEC_ID_TTA;
89 st->codec->channels = channels;
90 st->codec->sample_rate = samplerate;
91 st->codec->bits_per_sample = bps;
93 st->codec->extradata_size = url_ftell(&s->pb) - start;
94 if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
95 //this check is redundant as get_buffer should fail
96 av_log(s, AV_LOG_ERROR, "extradata_size too large\n");
99 st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);
100 url_fseek(&s->pb, start, SEEK_SET); // or SEEK_CUR and -size ? :)
101 get_buffer(&s->pb, st->codec->extradata, st->codec->extradata_size);
106 static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
108 TTAContext *c = s->priv_data;
112 if (c->currentframe > c->totalframes)
115 size = c->seektable[c->currentframe];
119 if (av_new_packet(pkt, size) < 0)
122 pkt->pos = url_ftell(&s->pb);
123 pkt->stream_index = 0;
124 ret = get_buffer(&s->pb, pkt->data, size);
130 // av_log(s, AV_LOG_INFO, "TTA packet #%d desired size: %d read size: %d at pos %d\n",
131 // c->currentframe, size, ret, pkt->pos);
135 static int tta_read_close(AVFormatContext *s)
137 TTAContext *c = s->priv_data;
139 av_free(c->seektable);
143 AVInputFormat tta_demuxer = {