FFmpeg  4.4.4
takdec.c
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1 /*
2  * Raw TAK demuxer
3  * Copyright (c) 2012 Paul B Mahol
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 
24 #define BITSTREAM_READER_LE
25 #include "libavcodec/tak.h"
26 
27 #include "apetag.h"
28 #include "avformat.h"
29 #include "avio_internal.h"
30 #include "internal.h"
31 #include "rawdec.h"
32 
33 typedef struct TAKDemuxContext {
34  AVClass *class;
37  int64_t data_end;
39 
40 static int tak_probe(const AVProbeData *p)
41 {
42  if (!memcmp(p->buf, "tBaK", 4))
44  return 0;
45 }
46 
47 static unsigned long tak_check_crc(unsigned long checksum, const uint8_t *buf,
48  unsigned int len)
49 {
51 }
52 
54 {
55  TAKDemuxContext *tc = s->priv_data;
56  AVIOContext *pb = s->pb;
57  GetBitContext gb;
58  AVStream *st;
59  uint8_t *buffer = NULL;
60  int ret;
61 
62  st = avformat_new_stream(s, 0);
63  if (!st)
64  return AVERROR(ENOMEM);
65 
69 
70  tc->mlast_frame = 0;
71  if (avio_rl32(pb) != MKTAG('t', 'B', 'a', 'K')) {
72  avio_seek(pb, -4, SEEK_CUR);
73  return 0;
74  }
75 
76  while (!avio_feof(pb)) {
77  enum TAKMetaDataType type;
78  int size;
79 
80  type = avio_r8(pb) & 0x7f;
81  size = avio_rl24(pb);
82 
83  switch (type) {
85  if (st->codecpar->extradata)
86  return AVERROR_INVALIDDATA;
89  if (size <= 3)
90  return AVERROR_INVALIDDATA;
91 
93  if (!buffer)
94  return AVERROR(ENOMEM);
95  memset(buffer + size - 3, 0, AV_INPUT_BUFFER_PADDING_SIZE);
96 
97  ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
98  if (avio_read(pb, buffer, size - 3) != size - 3) {
99  av_freep(&buffer);
100  return AVERROR(EIO);
101  }
102  if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
103  av_log(s, AV_LOG_ERROR, "%d metadata block CRC error.\n", type);
104  if (s->error_recognition & AV_EF_EXPLODE) {
105  av_freep(&buffer);
106  return AVERROR_INVALIDDATA;
107  }
108  }
109 
110  break;
111  case TAK_METADATA_MD5: {
112  uint8_t md5[16];
113  int i;
114 
115  if (size != 19)
116  return AVERROR_INVALIDDATA;
117  ffio_init_checksum(pb, tak_check_crc, 0xCE04B7U);
118  avio_read(pb, md5, 16);
119  if (ffio_get_checksum(s->pb) != avio_rb24(pb)) {
120  av_log(s, AV_LOG_ERROR, "MD5 metadata block CRC error.\n");
121  if (s->error_recognition & AV_EF_EXPLODE)
122  return AVERROR_INVALIDDATA;
123  }
124 
125  av_log(s, AV_LOG_VERBOSE, "MD5=");
126  for (i = 0; i < 16; i++)
127  av_log(s, AV_LOG_VERBOSE, "%02x", md5[i]);
128  av_log(s, AV_LOG_VERBOSE, "\n");
129  break;
130  }
131  case TAK_METADATA_END: {
132  int64_t curpos = avio_tell(pb);
133 
134  if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
136  avio_seek(pb, curpos, SEEK_SET);
137  }
138 
139  tc->data_end += curpos;
140  return 0;
141  }
142  default:
143  ret = avio_skip(pb, size);
144  if (ret < 0)
145  return ret;
146  }
147 
148  if (type == TAK_METADATA_STREAMINFO) {
149  TAKStreamInfo ti;
150 
151  ret = avpriv_tak_parse_streaminfo(&ti, buffer, size -3);
152  if (ret < 0)
153  goto end;
154  if (ti.samples > 0)
155  st->duration = ti.samples;
157  if (ti.ch_layout)
159  st->codecpar->sample_rate = ti.sample_rate;
160  st->codecpar->channels = ti.channels;
161  st->start_time = 0;
162  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
163  st->codecpar->extradata = buffer;
164  st->codecpar->extradata_size = size - 3;
165  buffer = NULL;
166  } else if (type == TAK_METADATA_LAST_FRAME) {
167  if (size != 11) {
168  ret = AVERROR_INVALIDDATA;
169  goto end;
170  }
171  init_get_bits8(&gb, buffer, size - 3);
172  tc->mlast_frame = 1;
173  tc->data_end = get_bits64(&gb, TAK_LAST_FRAME_POS_BITS) +
175  av_freep(&buffer);
176  } else if (type == TAK_METADATA_ENCODER) {
177  init_get_bits8(&gb, buffer, size - 3);
178  av_log(s, AV_LOG_VERBOSE, "encoder version: %0X\n",
180  av_freep(&buffer);
181  }
182  }
183 
184  return AVERROR_EOF;
185 end:
186  av_freep(&buffer);
187  return ret;
188 }
189 
191 {
192  TAKDemuxContext *tc = s->priv_data;
193  int ret;
194 
195  if (tc->mlast_frame) {
196  AVIOContext *pb = s->pb;
197  int64_t size, left;
198 
199  left = tc->data_end - avio_tell(pb);
200  size = FFMIN(left, 1024);
201  if (size <= 0)
202  return AVERROR_EOF;
203 
204  ret = av_get_packet(pb, pkt, size);
205  if (ret < 0)
206  return ret;
207 
208  pkt->stream_index = 0;
209  } else {
211  }
212 
213  return ret;
214 }
215 
218  .name = "tak",
219  .long_name = NULL_IF_CONFIG_SMALL("raw TAK"),
220  .priv_data_size = sizeof(TAKDemuxContext),
225  .extensions = "tak",
226  .raw_codec_id = AV_CODEC_ID_TAK,
227  .priv_class = &tak_demuxer_class,
228 };
int64_t ff_ape_parse_tag(AVFormatContext *s)
Read and parse an APE tag.
Definition: apetag.c:118
uint8_t
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1656
Main libavformat public API header.
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
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
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:463
@ AVSTREAM_PARSE_FULL_RAW
full parsing and repack with timestamp and position generation by parser for raw this assumes that ea...
Definition: avformat.h:798
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
unsigned int avio_rl24(AVIOContext *s)
Definition: aviobuf.c:742
unsigned int avio_rb24(AVIOContext *s)
Definition: aviobuf.c:774
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
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
unsigned long ffio_get_checksum(AVIOContext *s)
Definition: aviobuf.c:604
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
#define FFMIN(a, b)
Definition: common.h:105
#define MKTAG(a, b, c, d)
Definition: common.h:478
#define NULL
Definition: coverity.c:32
Public header for CRC hash function implementation.
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:545
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:546
static uint64_t get_bits64(GetBitContext *s, int n)
Read 0-64 bits.
Definition: get_bits.h:572
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
@ AV_CODEC_ID_TAK
Definition: codec_id.h:486
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding.
Definition: avcodec.h:215
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
const AVCRC * av_crc_get_table(AVCRCId crc_id)
Get an initialized standard CRC table.
Definition: crc.c:374
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:392
@ AV_CRC_24_IEEE
Definition: crc.h:56
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:210
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
cl_device_type type
int i
Definition: input.c:407
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:4945
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawdec.c:35
static unsigned long tak_check_crc(unsigned long checksum, const uint8_t *buf, unsigned int len)
Definition: takdec.c:47
static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: takdec.c:190
static int tak_probe(const AVProbeData *p)
Definition: takdec.c:40
AVInputFormat ff_tak_demuxer
Definition: takdec.c:217
static int tak_read_header(AVFormatContext *s)
Definition: takdec.c:53
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
#define FF_RAW_DEMUXER_CLASS(name)
Definition: rawdec.h:55
#define tc
Definition: regdef.h:69
static char buffer[20]
Definition: seek.c:32
Describe the class of an AVClass context structure.
Definition: log.h:67
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
int channels
Audio only.
Definition: codec_par.h:166
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
Bytestream IO Context.
Definition: avio.h:161
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:912
enum AVStreamParseType need_parsing
Definition: avformat.h:1081
int mlast_frame
Definition: takdec.c:36
int raw_packet_size
Definition: takdec.c:35
int64_t data_end
Definition: takdec.c:37
uint64_t ch_layout
Definition: tak.h:138
int64_t samples
Definition: tak.h:139
int sample_rate
Definition: tak.h:132
int bps
Definition: tak.h:134
int channels
Definition: tak.h:133
#define av_freep(p)
#define av_malloc(s)
#define av_log(a,...)
int avpriv_tak_parse_streaminfo(TAKStreamInfo *s, const uint8_t *buf, int size)
Parse the Streaminfo metadata block.
Definition: tak.c:128
TAK (Tom's lossless Audio Kompressor) decoder/demuxer common functions.
TAKMetaDataType
Definition: tak.h:104
@ TAK_METADATA_STREAMINFO
Definition: tak.h:106
@ TAK_METADATA_END
Definition: tak.h:105
@ TAK_METADATA_MD5
Definition: tak.h:111
@ TAK_METADATA_ENCODER
Definition: tak.h:109
@ TAK_METADATA_LAST_FRAME
Definition: tak.h:112
#define TAK_LAST_FRAME_POS_BITS
Definition: tak.h:43
#define TAK_ENCODER_VERSION_BITS
Definition: tak.h:47
#define TAK_LAST_FRAME_SIZE_BITS
Definition: tak.h:44
static volatile int checksum
Definition: adler32.c:30
AVPacket * pkt
Definition: movenc.c:59
struct AVMD5 * md5
Definition: movenc.c:56
int size
int len