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"
28 int totalframes, currentframe;
31 static int tta_probe(AVProbeData *p)
33 const uint8_t *d = p->buf;
35 if (ff_id3v2_match(d, ID3v2_DEFAULT_MAGIC))
36 d += ff_id3v2_tag_len(d);
38 if (d - p->buf >= p->buf_size)
41 if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1')
46 static int tta_read_header(AVFormatContext *s, AVFormatParameters *ap)
48 TTAContext *c = s->priv_data;
50 int i, channels, bps, samplerate, datalen, framelen;
51 uint64_t framepos, start_offset;
53 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC);
54 if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
57 start_offset = url_ftell(s->pb);
58 if (get_le32(s->pb) != AV_RL32("TTA1"))
59 return -1; // not tta file
61 url_fskip(s->pb, 2); // FIXME: flags
62 channels = get_le16(s->pb);
63 bps = get_le16(s->pb);
64 samplerate = get_le32(s->pb);
65 if(samplerate <= 0 || samplerate > 1000000){
66 av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
70 datalen = get_le32(s->pb);
72 av_log(s, AV_LOG_ERROR, "nonsense datalen\n");
76 url_fskip(s->pb, 4); // header crc
78 framelen = samplerate*256/245;
79 c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0);
82 if(c->totalframes >= UINT_MAX/sizeof(uint32_t)){
83 av_log(s, AV_LOG_ERROR, "totalframes too large\n");
87 st = av_new_stream(s, 0);
89 return AVERROR(ENOMEM);
91 av_set_pts_info(st, 64, 1, samplerate);
93 st->duration = datalen;
95 framepos = url_ftell(s->pb) + 4*c->totalframes + 4;
97 for (i = 0; i < c->totalframes; i++) {
98 uint32_t size = get_le32(s->pb);
99 av_add_index_entry(st, framepos, i*framelen, size, 0, AVINDEX_KEYFRAME);
102 url_fskip(s->pb, 4); // seektable crc
104 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
105 st->codec->codec_id = CODEC_ID_TTA;
106 st->codec->channels = channels;
107 st->codec->sample_rate = samplerate;
108 st->codec->bits_per_coded_sample = bps;
110 st->codec->extradata_size = url_ftell(s->pb) - start_offset;
111 if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
112 //this check is redundant as get_buffer should fail
113 av_log(s, AV_LOG_ERROR, "extradata_size too large\n");
116 st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);
117 url_fseek(s->pb, start_offset, SEEK_SET);
118 get_buffer(s->pb, st->codec->extradata, st->codec->extradata_size);
123 static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
125 TTAContext *c = s->priv_data;
126 AVStream *st = s->streams[0];
130 if (c->currentframe > c->totalframes)
133 size = st->index_entries[c->currentframe].size;
135 ret = av_get_packet(s->pb, pkt, size);
136 pkt->dts = st->index_entries[c->currentframe++].timestamp;
140 static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
142 TTAContext *c = s->priv_data;
143 AVStream *st = s->streams[stream_index];
144 int index = av_index_search_timestamp(st, timestamp, flags);
148 c->currentframe = index;
149 url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
154 AVInputFormat tta_demuxer = {
156 NULL_IF_CONFIG_SMALL("True Audio"),