FFmpeg
tta.c
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1 /*
2  * TTA demuxer
3  * Copyright (c) 2006 Alex Beregszaszi
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21 
22 #include "libavutil/crc.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/intreadwrite.h"
25 
26 #include "apetag.h"
27 #include "avformat.h"
28 #include "avio_internal.h"
29 #include "internal.h"
30 #include "id3v1.h"
31 
32 typedef struct TTAContext {
36 } TTAContext;
37 
38 static int tta_probe(const AVProbeData *p)
39 {
40  if (AV_RL32(&p->buf[0]) == MKTAG('T', 'T', 'A', '1') &&
41  (AV_RL16(&p->buf[4]) == 1 || AV_RL16(&p->buf[4]) == 2) &&
42  AV_RL16(&p->buf[6]) > 0 &&
43  AV_RL16(&p->buf[8]) > 0 &&
44  AV_RL32(&p->buf[10]) > 0)
45  return AVPROBE_SCORE_EXTENSION + 30;
46  return 0;
47 }
48 
50 {
51  TTAContext *c = s->priv_data;
52  AVStream *st;
53  int i, channels, bps, samplerate;
54  int64_t framepos, start_offset;
55  uint32_t nb_samples, crc;
56 
58 
59  start_offset = avio_tell(s->pb);
60  if (start_offset < 0)
61  return start_offset;
62  ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
63  if (avio_rl32(s->pb) != AV_RL32("TTA1"))
64  return AVERROR_INVALIDDATA;
65 
66  avio_skip(s->pb, 2); // FIXME: flags
67  channels = avio_rl16(s->pb);
68  bps = avio_rl16(s->pb);
69  samplerate = avio_rl32(s->pb);
70  if(samplerate <= 0 || samplerate > 1000000){
71  av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
72  return AVERROR_INVALIDDATA;
73  }
74 
75  nb_samples = avio_rl32(s->pb);
76  if (!nb_samples) {
77  av_log(s, AV_LOG_ERROR, "invalid number of samples\n");
78  return AVERROR_INVALIDDATA;
79  }
80 
81  crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
82  if (crc != avio_rl32(s->pb) && s->error_recognition & AV_EF_CRCCHECK) {
83  av_log(s, AV_LOG_ERROR, "Header CRC error\n");
84  return AVERROR_INVALIDDATA;
85  }
86 
87  c->frame_size = samplerate * 256 / 245;
88  c->last_frame_size = nb_samples % c->frame_size;
89  if (!c->last_frame_size)
90  c->last_frame_size = c->frame_size;
91  c->totalframes = nb_samples / c->frame_size + (c->last_frame_size < c->frame_size);
92  c->currentframe = 0;
93 
94  if(c->totalframes >= UINT_MAX/sizeof(uint32_t) || c->totalframes <= 0){
95  av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes);
96  return AVERROR_INVALIDDATA;
97  }
98 
99  st = avformat_new_stream(s, NULL);
100  if (!st)
101  return AVERROR(ENOMEM);
102 
103  avpriv_set_pts_info(st, 64, 1, samplerate);
104  st->start_time = 0;
105  st->duration = nb_samples;
106 
107  framepos = avio_tell(s->pb);
108  if (framepos < 0)
109  return framepos;
110  framepos += 4 * c->totalframes + 4;
111 
112  if (ff_alloc_extradata(st->codecpar, avio_tell(s->pb) - start_offset))
113  return AVERROR(ENOMEM);
114 
115  avio_seek(s->pb, start_offset, SEEK_SET);
117 
118  ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
119  for (i = 0; i < c->totalframes; i++) {
120  uint32_t size = avio_rl32(s->pb);
121  int r;
122  if ((r = av_add_index_entry(st, framepos, i * (int64_t)c->frame_size, size, 0,
123  AVINDEX_KEYFRAME)) < 0)
124  return r;
125  framepos += size;
126  }
127  crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
128  if (crc != avio_rl32(s->pb) && s->error_recognition & AV_EF_CRCCHECK) {
129  av_log(s, AV_LOG_ERROR, "Seek table CRC error\n");
130  return AVERROR_INVALIDDATA;
131  }
132 
135  st->codecpar->channels = channels;
136  st->codecpar->sample_rate = samplerate;
138 
139  if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
140  int64_t pos = avio_tell(s->pb);
142  avio_seek(s->pb, pos, SEEK_SET);
143  }
144 
145  return 0;
146 }
147 
149 {
150  TTAContext *c = s->priv_data;
151  AVStream *st = s->streams[0];
152  int size, ret;
153 
154  // FIXME!
155  if (c->currentframe >= c->totalframes)
156  return AVERROR_EOF;
157 
158  if (st->internal->nb_index_entries < c->totalframes) {
159  av_log(s, AV_LOG_ERROR, "Index entry disappeared\n");
160  return AVERROR_INVALIDDATA;
161  }
162 
163  size = st->internal->index_entries[c->currentframe].size;
164 
165  ret = av_get_packet(s->pb, pkt, size);
166  pkt->dts = st->internal->index_entries[c->currentframe++].timestamp;
167  pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size :
168  c->frame_size;
169  return ret;
170 }
171 
172 static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
173 {
174  TTAContext *c = s->priv_data;
175  AVStream *st = s->streams[stream_index];
176  int index = av_index_search_timestamp(st, timestamp, flags);
177  if (index < 0)
178  return -1;
179  if (avio_seek(s->pb, st->internal->index_entries[index].pos, SEEK_SET) < 0)
180  return -1;
181 
182  c->currentframe = index;
183 
184  return 0;
185 }
186 
188  .name = "tta",
189  .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
190  .priv_data_size = sizeof(TTAContext),
195  .extensions = "tta",
196 };
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
r
const char * r
Definition: vf_curves.c:116
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4547
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
MKTAG
#define MKTAG(a, b, c, d)
Definition: common.h:478
apetag.h
tta_probe
static int tta_probe(const AVProbeData *p)
Definition: tta.c:38
index
fg index
Definition: ffmpeg_filter.c:170
ff_id3v1_read
void ff_id3v1_read(AVFormatContext *s)
Read an ID3v1 tag.
Definition: id3v1.c:279
AVStream::internal
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1112
TTAContext
Definition: tta.c:48
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:387
id3v1.h
ffio_get_checksum
unsigned long ffio_get_checksum(AVIOContext *s)
Definition: aviobuf.c:604
ff_ape_parse_tag
int64_t ff_ape_parse_tag(AVFormatContext *s)
Read and parse an APE tag.
Definition: apetag.c:108
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:811
crc.h
tta_read_packet
static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: tta.c:148
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
av_add_index_entry
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:2044
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
AVInputFormat
Definition: avformat.h:640
AV_CODEC_ID_TTA
@ AV_CODEC_ID_TTA
Definition: codec_id.h:446
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVIndexEntry::size
int size
Definition: avformat.h:814
AVIndexEntry::timestamp
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:805
channels
channels
Definition: aptx.h:33
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:94
ff_crcEDB88320_update
unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf, unsigned int len)
Definition: aviobuf.c:592
AVFormatContext
Format I/O context.
Definition: avformat.h:1231
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVPROBE_SCORE_EXTENSION
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4993
bps
unsigned bps
Definition: movenc.c:1612
size
int size
Definition: twinvq_data.h:10344
AVStreamInternal::nb_index_entries
int nb_index_entries
Definition: internal.h:252
ffio_init_checksum
void ffio_init_checksum(AVIOContext *s, unsigned long(*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum)
Definition: aviobuf.c:612
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:368
AVStreamInternal::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:250
TTAContext::totalframes
int totalframes
Definition: tta.c:33
i
int i
Definition: input.c:407
avio_internal.h
av_get_packet
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:873
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
ff_tta_demuxer
AVInputFormat ff_tta_demuxer
Definition: tta.c:187
AV_EF_CRCCHECK
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data,...
Definition: avcodec.h:1653
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
dict.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:804
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
TTAContext::last_frame_size
int last_frame_size
Definition: tta.c:35
tta_read_seek
static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: tta.c:172
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:346
tta_read_header
static int tta_read_header(AVFormatContext *s)
Definition: tta.c:49
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
TTAContext::currentframe
int currentframe
Definition: tta.c:33
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:912
TTAContext::frame_size
int frame_size
Definition: tta.c:34
av_index_search_timestamp
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2161
ff_alloc_extradata
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0.
Definition: utils.c:3368