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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
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  */
22 #include "libavutil/crc.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/intreadwrite.h"
26 #include "apetag.h"
27 #include "avformat.h"
28 #include "avio_internal.h"
29 #include "internal.h"
30 #include "id3v1.h"
32 typedef struct TTAContext {
36 } TTAContext;
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)
46  return 0;
47 }
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;
57  ff_id3v1_read(s);
59  start_offset = avio_tell(s->pb);
60  if (start_offset < 0)
61  return start_offset;
63  if (avio_rl32(s->pb) != AV_RL32("TTA1"))
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");
73  }
75  nb_samples = avio_rl32(s->pb);
76  if (!nb_samples) {
77  av_log(s, AV_LOG_ERROR, "invalid number of samples\n");
79  }
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");
85  }
87  c->frame_size = samplerate * 256 / 245;
88  c->last_frame_size = nb_samples % c->frame_size;
89  if (!c->last_frame_size)
91  c->totalframes = nb_samples / c->frame_size + (c->last_frame_size < c->frame_size);
92  c->currentframe = 0;
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);
97  }
99  st = avformat_new_stream(s, NULL);
100  if (!st)
101  return AVERROR(ENOMEM);
103  avpriv_set_pts_info(st, 64, 1, samplerate);
104  st->start_time = 0;
105  st->duration = nb_samples;
107  framepos = avio_tell(s->pb);
108  if (framepos < 0)
109  return framepos;
110  framepos += 4 * c->totalframes + 4;
112  if (ff_alloc_extradata(st->codecpar, avio_tell(s->pb) - start_offset))
113  return AVERROR(ENOMEM);
115  avio_seek(s->pb, start_offset, SEEK_SET);
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,
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");
131  }
135  st->codecpar->channels = channels;
136  st->codecpar->sample_rate = samplerate;
139  if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
140  int64_t pos = avio_tell(s->pb);
141  ff_ape_parse_tag(s);
142  avio_seek(s->pb, pos, SEEK_SET);
143  }
145  return 0;
146 }
149 {
150  TTAContext *c = s->priv_data;
151  AVStream *st = s->streams[0];
152  int size, ret;
154  // FIXME!
155  if (c->currentframe >= c->totalframes)
156  return AVERROR_EOF;
158  if (st->internal->nb_index_entries < c->totalframes) {
159  av_log(s, AV_LOG_ERROR, "Index entry disappeared\n");
161  }
163  size = st->internal->index_entries[c->currentframe].size;
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 }
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;
182  c->currentframe = index;
184  return 0;
185 }
188  .name = "tta",
189  .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
190  .priv_data_size = sizeof(TTAContext),
195  .extensions = "tta",
196 };
#define NULL
Definition: coverity.c:32
Invalid data found when processing input.
Definition: error.h:59
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
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:4999
int64_t pos
Definition: avformat.h:813
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: tta.c:148
void ff_id3v1_read(AVFormatContext *s)
Read an ID3v1 tag.
Definition: id3v1.c:279
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
Definition: tta.c:48
int bps
Definition: tta.c:53
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
AVPacket * pkt
Definition: movenc.c:59
fg index
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:91
Format I/O context.
Definition: avformat.h:1247
Public dictionary API.
static int tta_probe(const AVProbeData *p)
Definition: tta.c:38
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:387
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
unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf, unsigned int len)
Definition: aviobuf.c:592
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4553
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1315
Public header for CRC hash function implementation.
End of file.
Definition: error.h:55
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
ptrdiff_t size
Definition: opengl_enc.c:100
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
int frame_size
Definition: tta.c:34
Definition: avformat.h:820
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2161
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:814
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:117
const char * r
Definition: vf_curves.c:116
unsigned int pos
Definition: spdifenc.c:412
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int64_t ff_ape_parse_tag(AVFormatContext *s)
Read and parse an APE tag.
Definition: apetag.c:108
int totalframes
Definition: tta.c:33
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:250
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
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
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
#define s(width, name)
Definition: cbs_vp9.c:257
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
Stream structure.
Definition: avformat.h:884
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
Seeking works like for a local file.
Definition: avio.h:40
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1123
AVIOContext * pb
I/O context.
Definition: avformat.h:1289
unsigned long ffio_get_checksum(AVIOContext *s)
Definition: aviobuf.c:604
Verify checksums embedded in the bitstream (could be of either encoded or decoded data...
Definition: avcodec.h:1653
score for file extension
Definition: avformat.h:451
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
int nb_index_entries
Definition: internal.h:252
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:933
int sample_rate
Audio only.
Definition: codec_par.h:170
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
int channels
Definition: tta.c:53
Main libavformat public API header.
static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: tta.c:172
static int tta_read_header(AVFormatContext *s)
Definition: tta.c:49
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:923
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1516
AVInputFormat ff_tta_demuxer
Definition: tta.c:187
void * priv_data
Format private data.
Definition: avformat.h:1275
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
int channels
Audio only.
Definition: codec_par.h:166
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: packet.h:368
int last_frame_size
Definition: tta.c:35
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1049
int currentframe
Definition: tta.c:33
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
#define MKTAG(a, b, c, d)
Definition: common.h:478
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:91
This structure stores compressed data.
Definition: packet.h:346
int i
Definition: input.c:407