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 "demux.h"
30 #include "internal.h"
31 #include "id3v1.h"
32 
33 typedef struct TTAContext {
37 } TTAContext;
38 
39 static int tta_probe(const AVProbeData *p)
40 {
41  if (AV_RL32(&p->buf[0]) == MKTAG('T', 'T', 'A', '1') &&
42  (AV_RL16(&p->buf[4]) == 1 || AV_RL16(&p->buf[4]) == 2) &&
43  AV_RL16(&p->buf[6]) > 0 &&
44  AV_RL16(&p->buf[8]) > 0 &&
45  AV_RL32(&p->buf[10]) > 0)
46  return AVPROBE_SCORE_EXTENSION + 30;
47  return 0;
48 }
49 
51 {
52  TTAContext *c = s->priv_data;
53  AVStream *st;
54  int i, channels, bps, samplerate;
55  int64_t framepos, start_offset;
56  uint32_t nb_samples, crc;
57 
59 
60  start_offset = avio_tell(s->pb);
61  if (start_offset < 0)
62  return start_offset;
63  ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
64  if (avio_rl32(s->pb) != AV_RL32("TTA1"))
65  return AVERROR_INVALIDDATA;
66 
67  avio_skip(s->pb, 2); // FIXME: flags
68  channels = avio_rl16(s->pb);
69  bps = avio_rl16(s->pb);
70  samplerate = avio_rl32(s->pb);
71  if(samplerate <= 0 || samplerate > 1000000){
72  av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
73  return AVERROR_INVALIDDATA;
74  }
75 
76  nb_samples = avio_rl32(s->pb);
77  if (!nb_samples) {
78  av_log(s, AV_LOG_ERROR, "invalid number of samples\n");
79  return AVERROR_INVALIDDATA;
80  }
81 
82  crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
83  if (crc != avio_rl32(s->pb) && s->error_recognition & AV_EF_CRCCHECK) {
84  av_log(s, AV_LOG_ERROR, "Header CRC error\n");
85  return AVERROR_INVALIDDATA;
86  }
87 
88  c->frame_size = samplerate * 256 / 245;
89  c->last_frame_size = nb_samples % c->frame_size;
90  if (!c->last_frame_size)
91  c->last_frame_size = c->frame_size;
92  c->totalframes = nb_samples / c->frame_size + (c->last_frame_size < c->frame_size);
93  c->currentframe = 0;
94 
95  if(c->totalframes >= (INT_MAX - 4)/sizeof(uint32_t) || c->totalframes <= 0){
96  av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes);
97  return AVERROR_INVALIDDATA;
98  }
99 
100  st = avformat_new_stream(s, NULL);
101  if (!st)
102  return AVERROR(ENOMEM);
103 
104  avpriv_set_pts_info(st, 64, 1, samplerate);
105  st->start_time = 0;
106  st->duration = nb_samples;
107 
108  framepos = avio_tell(s->pb);
109  if (framepos < 0)
110  return framepos;
111  framepos += 4 * c->totalframes + 4;
112 
113  if (ff_alloc_extradata(st->codecpar, avio_tell(s->pb) - start_offset))
114  return AVERROR(ENOMEM);
115 
116  avio_seek(s->pb, start_offset, SEEK_SET);
118 
119  ffio_init_checksum(s->pb, ff_crcEDB88320_update, UINT32_MAX);
120  for (i = 0; i < c->totalframes; i++) {
121  uint32_t size = avio_rl32(s->pb);
122  int r;
123  if (avio_feof(s->pb))
124  return AVERROR_INVALIDDATA;
125  if ((r = av_add_index_entry(st, framepos, i * (int64_t)c->frame_size, size, 0,
126  AVINDEX_KEYFRAME)) < 0)
127  return r;
128  framepos += size;
129  }
130  crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
131  if (crc != avio_rl32(s->pb) && s->error_recognition & AV_EF_CRCCHECK) {
132  av_log(s, AV_LOG_ERROR, "Seek table CRC error\n");
133  return AVERROR_INVALIDDATA;
134  }
135 
139  st->codecpar->sample_rate = samplerate;
141 
142  if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
143  int64_t pos = avio_tell(s->pb);
145  avio_seek(s->pb, pos, SEEK_SET);
146  }
147 
148  return 0;
149 }
150 
152 {
153  TTAContext *c = s->priv_data;
154  AVStream *st = s->streams[0];
155  FFStream *const sti = ffstream(st);
156  int size, ret;
157 
158  // FIXME!
159  if (c->currentframe >= c->totalframes)
160  return AVERROR_EOF;
161 
162  if (sti->nb_index_entries < c->totalframes) {
163  av_log(s, AV_LOG_ERROR, "Index entry disappeared\n");
164  return AVERROR_INVALIDDATA;
165  }
166 
167  size = sti->index_entries[c->currentframe].size;
168 
169  ret = av_get_packet(s->pb, pkt, size);
170  pkt->dts = sti->index_entries[c->currentframe++].timestamp;
171  pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size :
172  c->frame_size;
173  return ret;
174 }
175 
176 static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
177 {
178  TTAContext *c = s->priv_data;
179  AVStream *st = s->streams[stream_index];
180  int index = av_index_search_timestamp(st, timestamp, flags);
181  if (index < 0)
182  return -1;
183  if (avio_seek(s->pb, ffstream(st)->index_entries[index].pos, SEEK_SET) < 0)
184  return -1;
185 
186  c->currentframe = index;
187 
188  return 0;
189 }
190 
192  .p.name = "tta",
193  .p.long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
194  .p.extensions = "tta",
195  .priv_data_size = sizeof(TTAContext),
200 };
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:69
r
const char * r
Definition: vf_curves.c:127
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
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
apetag.h
tta_probe
static int tta_probe(const AVProbeData *p)
Definition: tta.c:39
ff_id3v1_read
void ff_id3v1_read(AVFormatContext *s)
Read an ID3v1 tag.
Definition: id3v1.c:278
TTAContext
Definition: tta.c:50
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:542
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:313
id3v1.h
ffio_get_checksum
unsigned long ffio_get_checksum(AVIOContext *s)
Definition: aviobuf.c:583
ff_ape_parse_tag
int64_t ff_ape_parse_tag(AVFormatContext *s)
Read and parse an APE tag.
Definition: apetag.c:110
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:610
crc.h
tta_read_packet
static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: tta.c:151
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:853
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:417
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:151
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: seek.c:121
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:494
ff_tta_demuxer
const FFInputFormat ff_tta_demuxer
Definition: tta.c:191
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:802
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:714
pkt
AVPacket * pkt
Definition: movenc.c:60
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AV_CODEC_ID_TTA
@ AV_CODEC_ID_TTA
Definition: codec_id.h:462
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_read_callback.c:42
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:553
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:453
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVIndexEntry::size
int size
Definition: avformat.h:613
AVIndexEntry::timestamp
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:604
channels
channels
Definition: aptx.h:31
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:571
AVFormatContext
Format I/O context.
Definition: avformat.h:1255
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:766
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:550
NULL
#define NULL
Definition: coverity.c:32
FFStream::nb_index_entries
int nb_index_entries
Definition: internal.h:251
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:451
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:180
AV_EF_CRCCHECK
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data,...
Definition: defs.h:48
index
int index
Definition: gxfenc.c:90
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:461
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:184
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:73
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:730
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:94
FFStream
Definition: internal.h:193
bps
unsigned bps
Definition: movenc.c:1852
size
int size
Definition: twinvq_data.h:10344
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:591
FFInputFormat::p
AVInputFormat p
The public AVInputFormat.
Definition: demux.h:41
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:523
TTAContext::totalframes
int totalframes
Definition: tta.c:34
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
avio_internal.h
demux.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:91
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:743
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:231
pos
unsigned int pos
Definition: spdifenc.c:414
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:41
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:612
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:318
FFStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:249
read_probe
static int read_probe(const AVProbeData *p)
Definition: cdg.c:30
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:110
TTAContext::last_frame_size
int last_frame_size
Definition: tta.c:36
tta_read_seek
static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: tta.c:176
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:501
FFInputFormat
Definition: demux.h:37
tta_read_header
static int tta_read_header(AVFormatContext *s)
Definition: tta.c:50
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
TTAContext::currentframe
int currentframe
Definition: tta.c:34
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
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:792
TTAContext::frame_size
int frame_size
Definition: tta.c:35
av_index_search_timestamp
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: seek.c:244
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:227
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:346