FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
tta.c
Go to the documentation of this file.
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 unsigned long tta_check_crc(unsigned long checksum, const uint8_t *buf,
39  unsigned int len)
40 {
41  return av_crc(av_crc_get_table(AV_CRC_32_IEEE_LE), checksum, buf, len);
42 }
43 
44 static int tta_probe(AVProbeData *p)
45 {
46  if (AV_RL32(&p->buf[0]) == MKTAG('T', 'T', 'A', '1') &&
47  (AV_RL16(&p->buf[4]) == 1 || AV_RL16(&p->buf[4]) == 2) &&
48  AV_RL16(&p->buf[6]) > 0 &&
49  AV_RL16(&p->buf[8]) > 0 &&
50  AV_RL32(&p->buf[10]) > 0)
51  return AVPROBE_SCORE_EXTENSION + 30;
52  return 0;
53 }
54 
56 {
57  TTAContext *c = s->priv_data;
58  AVStream *st;
59  int i, channels, bps, samplerate;
60  int64_t framepos, start_offset;
61  uint32_t nb_samples, crc;
62 
63  ff_id3v1_read(s);
64 
65  start_offset = avio_tell(s->pb);
66  if (start_offset < 0)
67  return start_offset;
68  ffio_init_checksum(s->pb, tta_check_crc, UINT32_MAX);
69  if (avio_rl32(s->pb) != AV_RL32("TTA1"))
70  return AVERROR_INVALIDDATA;
71 
72  avio_skip(s->pb, 2); // FIXME: flags
73  channels = avio_rl16(s->pb);
74  bps = avio_rl16(s->pb);
75  samplerate = avio_rl32(s->pb);
76  if(samplerate <= 0 || samplerate > 1000000){
77  av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
78  return AVERROR_INVALIDDATA;
79  }
80 
81  nb_samples = avio_rl32(s->pb);
82  if (!nb_samples) {
83  av_log(s, AV_LOG_ERROR, "invalid number of samples\n");
84  return AVERROR_INVALIDDATA;
85  }
86 
87  crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
88  if (crc != avio_rl32(s->pb) && s->error_recognition & AV_EF_CRCCHECK) {
89  av_log(s, AV_LOG_ERROR, "Header CRC error\n");
90  return AVERROR_INVALIDDATA;
91  }
92 
93  c->frame_size = samplerate * 256 / 245;
94  c->last_frame_size = nb_samples % c->frame_size;
95  if (!c->last_frame_size)
97  c->totalframes = nb_samples / c->frame_size + (c->last_frame_size < c->frame_size);
98  c->currentframe = 0;
99 
100  if(c->totalframes >= UINT_MAX/sizeof(uint32_t) || c->totalframes <= 0){
101  av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes);
102  return AVERROR_INVALIDDATA;
103  }
104 
105  st = avformat_new_stream(s, NULL);
106  if (!st)
107  return AVERROR(ENOMEM);
108 
109  avpriv_set_pts_info(st, 64, 1, samplerate);
110  st->start_time = 0;
111  st->duration = nb_samples;
112 
113  framepos = avio_tell(s->pb);
114  if (framepos < 0)
115  return framepos;
116  framepos += 4 * c->totalframes + 4;
117 
118  if (ff_alloc_extradata(st->codecpar, avio_tell(s->pb) - start_offset))
119  return AVERROR(ENOMEM);
120 
121  avio_seek(s->pb, start_offset, SEEK_SET);
123 
124  ffio_init_checksum(s->pb, tta_check_crc, UINT32_MAX);
125  for (i = 0; i < c->totalframes; i++) {
126  uint32_t size = avio_rl32(s->pb);
127  int r;
128  if ((r = av_add_index_entry(st, framepos, i * c->frame_size, size, 0,
129  AVINDEX_KEYFRAME)) < 0)
130  return r;
131  framepos += size;
132  }
133  crc = ffio_get_checksum(s->pb) ^ UINT32_MAX;
134  if (crc != avio_rl32(s->pb) && s->error_recognition & AV_EF_CRCCHECK) {
135  av_log(s, AV_LOG_ERROR, "Seek table CRC error\n");
136  return AVERROR_INVALIDDATA;
137  }
138 
141  st->codecpar->channels = channels;
142  st->codecpar->sample_rate = samplerate;
144 
145  if (s->pb->seekable) {
146  int64_t pos = avio_tell(s->pb);
147  ff_ape_parse_tag(s);
148  avio_seek(s->pb, pos, SEEK_SET);
149  }
150 
151  return 0;
152 }
153 
155 {
156  TTAContext *c = s->priv_data;
157  AVStream *st = s->streams[0];
158  int size, ret;
159 
160  // FIXME!
161  if (c->currentframe >= c->totalframes)
162  return AVERROR_EOF;
163 
164  if (st->nb_index_entries < c->totalframes) {
165  av_log(s, AV_LOG_ERROR, "Index entry disappeared\n");
166  return AVERROR_INVALIDDATA;
167  }
168 
169  size = st->index_entries[c->currentframe].size;
170 
171  ret = av_get_packet(s->pb, pkt, size);
172  pkt->dts = st->index_entries[c->currentframe++].timestamp;
173  pkt->duration = c->currentframe == c->totalframes ? c->last_frame_size :
174  c->frame_size;
175  return ret;
176 }
177 
178 static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
179 {
180  TTAContext *c = s->priv_data;
181  AVStream *st = s->streams[stream_index];
182  int index = av_index_search_timestamp(st, timestamp, flags);
183  if (index < 0)
184  return -1;
185  if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
186  return -1;
187 
188  c->currentframe = index;
189 
190  return 0;
191 }
192 
194  .name = "tta",
195  .long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
196  .priv_data_size = sizeof(TTAContext),
201  .extensions = "tta",
202 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static unsigned long tta_check_crc(unsigned long checksum, const uint8_t *buf, unsigned int len)
Definition: tta.c:38
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:1909
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:4436
int64_t pos
Definition: avformat.h:816
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: avcodec.h:3922
static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: tta.c:154
void ff_id3v1_read(AVFormatContext *s)
Read an ID3v1 tag.
Definition: id3v1.c:235
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:230
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1074
Definition: tta.c:48
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:304
static AVPacket pkt
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
Format I/O context.
Definition: avformat.h:1325
Public dictionary API.
uint8_t
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1598
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4074
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1393
#define AVERROR_EOF
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:260
ptrdiff_t size
Definition: opengl_enc.c:101
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:511
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:598
int frame_size
Definition: tta.c:34
#define AVINDEX_KEYFRAME
Definition: avformat.h:823
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2008
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:720
#define AVERROR(e)
Definition: error.h:43
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:817
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
const char * r
Definition: vf_curves.c:107
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3918
int64_t ff_ape_parse_tag(AVFormatContext *s)
Read and parse an APE tag.
Definition: apetag.c:118
int totalframes
Definition: tta.c:33
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3940
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:461
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:577
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:243
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:3116
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
static int tta_probe(AVProbeData *p)
Definition: tta.c:44
uint32_t av_crc(const AVCRC *ctx, uint32_t crc, const uint8_t *buffer, size_t length)
Calculate the CRC of a block.
Definition: crc.c:357
static volatile int checksum
Definition: adler32.c:28
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:638
Stream structure.
Definition: avformat.h:876
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVIOContext * pb
I/O context.
Definition: avformat.h:1367
void * buf
Definition: avisynth_c.h:553
int nb_index_entries
Definition: avformat.h:1076
int index
Definition: gxfenc.c:89
unsigned long ffio_get_checksum(AVIOContext *s)
Definition: aviobuf.c:569
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data...
Definition: avcodec.h:2944
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:469
This structure contains the data a format has to probe a file.
Definition: avformat.h:459
static int flags
Definition: cpu.c:47
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:930
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:343
int sample_rate
Audio only.
Definition: avcodec.h:4032
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:704
Main libavformat public API header.
static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: tta.c:178
static int tta_read_header(AVFormatContext *s)
Definition: tta.c:55
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:923
static double c[64]
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1566
AVInputFormat ff_tta_demuxer
Definition: tta.c:193
unsigned bps
Definition: movenc.c:1368
int len
void * priv_data
Format private data.
Definition: avformat.h:1353
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3964
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3936
int channels
Audio only.
Definition: avcodec.h:4028
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1579
int last_frame_size
Definition: tta.c:35
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
AVCodecParameters * codecpar
Definition: avformat.h:1228
int currentframe
Definition: tta.c:33
#define MKTAG(a, b, c, d)
Definition: common.h:342
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1557