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"
27 int totalframes, currentframe;
30 static int tta_probe(AVProbeData *p)
32 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;
44 uint64_t framepos, start_offset;
46 if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
49 start_offset = url_ftell(s->pb);
50 if (get_le32(s->pb) != AV_RL32("TTA1"))
51 return -1; // not tta file
53 url_fskip(s->pb, 2); // FIXME: flags
54 channels = get_le16(s->pb);
55 bps = get_le16(s->pb);
56 samplerate = get_le32(s->pb);
57 if(samplerate <= 0 || samplerate > 1000000){
58 av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
62 datalen = get_le32(s->pb);
64 av_log(s, AV_LOG_ERROR, "nonsense datalen\n");
68 url_fskip(s->pb, 4); // header crc
70 framelen = samplerate*256/245;
71 c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0);
74 if(c->totalframes >= UINT_MAX/sizeof(uint32_t)){
75 av_log(s, AV_LOG_ERROR, "totalframes too large\n");
79 st = av_new_stream(s, 0);
81 return AVERROR(ENOMEM);
83 av_set_pts_info(st, 64, 1, samplerate);
85 st->duration = datalen;
87 framepos = url_ftell(s->pb) + 4*c->totalframes + 4;
89 for (i = 0; i < c->totalframes; i++) {
90 uint32_t size = get_le32(s->pb);
91 av_add_index_entry(st, framepos, i*framelen, size, 0, AVINDEX_KEYFRAME);
94 url_fskip(s->pb, 4); // seektable crc
96 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
97 st->codec->codec_id = CODEC_ID_TTA;
98 st->codec->channels = channels;
99 st->codec->sample_rate = samplerate;
100 st->codec->bits_per_coded_sample = bps;
102 st->codec->extradata_size = url_ftell(s->pb) - start_offset;
103 if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
104 //this check is redundant as get_buffer should fail
105 av_log(s, AV_LOG_ERROR, "extradata_size too large\n");
108 st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);
109 url_fseek(s->pb, start_offset, SEEK_SET);
110 get_buffer(s->pb, st->codec->extradata, st->codec->extradata_size);
115 static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
117 TTAContext *c = s->priv_data;
118 AVStream *st = s->streams[0];
122 if (c->currentframe > c->totalframes)
125 size = st->index_entries[c->currentframe].size;
127 ret = av_get_packet(s->pb, pkt, size);
128 pkt->dts = st->index_entries[c->currentframe++].timestamp;
132 static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
134 TTAContext *c = s->priv_data;
135 AVStream *st = s->streams[stream_index];
136 int index = av_index_search_timestamp(st, timestamp, flags);
140 c->currentframe = index;
141 url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
146 AVInputFormat tta_demuxer = {
148 NULL_IF_CONFIG_SMALL("True Audio"),