FFmpeg  4.3
lxfdec.c
Go to the documentation of this file.
1 /*
2  * LXF demuxer
3  * Copyright (c) 2010 Tomas Härdin
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 <inttypes.h>
23 
24 #include "libavutil/intreadwrite.h"
25 #include "libavcodec/bytestream.h"
26 #include "avformat.h"
27 #include "internal.h"
28 
29 #define LXF_MAX_PACKET_HEADER_SIZE 256
30 #define LXF_HEADER_DATA_SIZE 120
31 #define LXF_IDENT "LEITCH\0"
32 #define LXF_IDENT_LENGTH 8
33 #define LXF_SAMPLERATE 48000
34 
35 static const AVCodecTag lxf_tags[] = {
36  { AV_CODEC_ID_MJPEG, 0 },
38  { AV_CODEC_ID_MPEG2VIDEO, 2 }, //MpMl, 4:2:0
39  { AV_CODEC_ID_MPEG2VIDEO, 3 }, //MpPl, 4:2:2
40  { AV_CODEC_ID_DVVIDEO, 4 }, //DV25
41  { AV_CODEC_ID_DVVIDEO, 5 }, //DVCPRO
42  { AV_CODEC_ID_DVVIDEO, 6 }, //DVCPRO50
43  { AV_CODEC_ID_RAWVIDEO, 7 }, //AV_PIX_FMT_ARGB, where alpha is used for chroma keying
44  { AV_CODEC_ID_RAWVIDEO, 8 }, //16-bit chroma key
45  { AV_CODEC_ID_MPEG2VIDEO, 9 }, //4:2:2 CBP ("Constrained Bytes per Gop")
46  { AV_CODEC_ID_NONE, 0 },
47 };
48 
49 typedef struct LXFDemuxContext {
50  int channels; ///< number of audio channels. zero means no audio
51  int frame_number; ///< current video frame
54 
55 static int lxf_probe(const AVProbeData *p)
56 {
57  if (!memcmp(p->buf, LXF_IDENT, LXF_IDENT_LENGTH))
58  return AVPROBE_SCORE_MAX;
59 
60  return 0;
61 }
62 
63 /**
64  * Verify the checksum of an LXF packet header
65  *
66  * @param[in] header the packet header to check
67  * @return zero if the checksum is OK, non-zero otherwise
68  */
69 static int check_checksum(const uint8_t *header, int size)
70 {
71  int x;
72  uint32_t sum = 0;
73 
74  for (x = 0; x < size; x += 4)
75  sum += AV_RL32(&header[x]);
76 
77  return sum;
78 }
79 
80 /**
81  * Read input until we find the next ident. If found, copy it to the header buffer
82  *
83  * @param[out] header where to copy the ident to
84  * @return 0 if an ident was found, < 0 on I/O error
85  */
87 {
89  int ret;
90 
91  if ((ret = avio_read(s->pb, buf, LXF_IDENT_LENGTH)) != LXF_IDENT_LENGTH)
92  return ret < 0 ? ret : AVERROR_EOF;
93 
94  while (memcmp(buf, LXF_IDENT, LXF_IDENT_LENGTH)) {
95  if (avio_feof(s->pb))
96  return AVERROR_EOF;
97 
98  memmove(buf, &buf[1], LXF_IDENT_LENGTH-1);
99  buf[LXF_IDENT_LENGTH-1] = avio_r8(s->pb);
100  }
101 
103 
104  return 0;
105 }
106 
107 /**
108  * Read and checksum the next packet header
109  *
110  * @return the size of the payload following the header or < 0 on failure
111  */
113 {
114  LXFDemuxContext *lxf = s->priv_data;
115  AVIOContext *pb = s->pb;
116  int track_size, samples, ret;
117  uint32_t version, audio_format, header_size, channels, tmp;
118  AVStream *st;
120  const uint8_t *p = header + LXF_IDENT_LENGTH;
121 
122  //find and read the ident
123  if ((ret = lxf_sync(s, header)) < 0)
124  return ret;
125 
126  ret = avio_read(pb, header + LXF_IDENT_LENGTH, 8);
127  if (ret != 8)
128  return ret < 0 ? ret : AVERROR_EOF;
129 
130  version = bytestream_get_le32(&p);
131  header_size = bytestream_get_le32(&p);
132  if (version > 1)
133  avpriv_request_sample(s, "Format version %"PRIu32, version);
134 
135  if (header_size < (version ? 72 : 60) ||
136  header_size > LXF_MAX_PACKET_HEADER_SIZE ||
137  (header_size & 3)) {
138  av_log(s, AV_LOG_ERROR, "Invalid header size 0x%"PRIx32"\n", header_size);
139  return AVERROR_INVALIDDATA;
140  }
141 
142  //read the rest of the packet header
143  if ((ret = avio_read(pb, header + (p - header),
144  header_size - (p - header))) !=
145  header_size - (p - header))
146  return ret < 0 ? ret : AVERROR_EOF;
147 
148  if (check_checksum(header, header_size))
149  av_log(s, AV_LOG_ERROR, "checksum error\n");
150 
151  lxf->packet_type = bytestream_get_le32(&p);
152  p += version ? 20 : 12;
153 
154  lxf->extended_size = 0;
155  switch (lxf->packet_type) {
156  case 0:
157  //video
158  lxf->video_format = bytestream_get_le32(&p);
159  ret = bytestream_get_le32(&p);
160  //skip VBI data and metadata
161  avio_skip(pb, (int64_t)(uint32_t)AV_RL32(p + 4) +
162  (int64_t)(uint32_t)AV_RL32(p + 12));
163  break;
164  case 1:
165  //audio
166  if (s->nb_streams < 2) {
167  av_log(s, AV_LOG_INFO, "got audio packet, but no audio stream present\n");
168  break;
169  }
170 
171  if (version == 0)
172  p += 8;
173  audio_format = bytestream_get_le32(&p);
174  channels = bytestream_get_le32(&p);
175  track_size = bytestream_get_le32(&p);
176 
177  st = s->streams[1];
178 
179  //set codec based on specified audio bitdepth
180  //we only support tightly packed 16-, 20-, 24- and 32-bit PCM at the moment
181  st->codecpar->bits_per_coded_sample = (audio_format >> 6) & 0x3F;
182 
183  if (st->codecpar->bits_per_coded_sample != (audio_format & 0x3F)) {
184  avpriv_report_missing_feature(s, "Not tightly packed PCM");
185  return AVERROR_PATCHWELCOME;
186  }
187 
188  switch (st->codecpar->bits_per_coded_sample) {
189  case 16: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; break;
190  case 20: st->codecpar->codec_id = AV_CODEC_ID_PCM_LXF; break;
191  case 24: st->codecpar->codec_id = AV_CODEC_ID_PCM_S24LE_PLANAR; break;
192  case 32: st->codecpar->codec_id = AV_CODEC_ID_PCM_S32LE_PLANAR; break;
193  default:
194  avpriv_report_missing_feature(s, "PCM not 16-, 20-, 24- or 32-bits");
195  return AVERROR_PATCHWELCOME;
196  }
197 
198  samples = track_size * 8 / st->codecpar->bits_per_coded_sample;
199 
200  //use audio packet size to determine video standard
201  //for NTSC we have one 8008-sample audio frame per five video frames
202  if (samples == LXF_SAMPLERATE * 5005 / 30000) {
203  avpriv_set_pts_info(s->streams[0], 64, 1001, 30000);
204  } else {
205  //assume PAL, but warn if we don't have 1920 samples
206  if (samples != LXF_SAMPLERATE / 25)
208  "video doesn't seem to be PAL or NTSC. guessing PAL\n");
209 
210  avpriv_set_pts_info(s->streams[0], 64, 1, 25);
211  }
212 
213  //TODO: warning if track mask != (1 << channels) - 1?
214  ret = av_popcount(channels) * track_size;
215 
216  break;
217  default:
218  tmp = bytestream_get_le32(&p);
219  ret = bytestream_get_le32(&p);
220  if (tmp == 1)
221  lxf->extended_size = bytestream_get_le32(&p);
222  break;
223  }
224 
225  return ret;
226 }
227 
229 {
230  LXFDemuxContext *lxf = s->priv_data;
231  AVIOContext *pb = s->pb;
232  uint8_t header_data[LXF_HEADER_DATA_SIZE];
233  int ret;
234  AVStream *st;
235  uint32_t video_params, disk_params;
236  uint16_t record_date, expiration_date;
237 
238  if ((ret = get_packet_header(s)) < 0)
239  return ret;
240 
241  if (ret != LXF_HEADER_DATA_SIZE) {
242  av_log(s, AV_LOG_ERROR, "expected %d B size header, got %d\n",
244  return AVERROR_INVALIDDATA;
245  }
246 
247  if ((ret = avio_read(pb, header_data, LXF_HEADER_DATA_SIZE)) != LXF_HEADER_DATA_SIZE)
248  return ret < 0 ? ret : AVERROR_EOF;
249 
250  if (!(st = avformat_new_stream(s, NULL)))
251  return AVERROR(ENOMEM);
252 
253  st->duration = AV_RL32(&header_data[32]);
254  video_params = AV_RL32(&header_data[40]);
255  record_date = AV_RL16(&header_data[56]);
256  expiration_date = AV_RL16(&header_data[58]);
257  disk_params = AV_RL32(&header_data[116]);
258 
260  st->codecpar->bit_rate = 1000000 * ((video_params >> 14) & 0xFF);
261  st->codecpar->codec_tag = video_params & 0xF;
264 
265  av_log(s, AV_LOG_DEBUG, "record: %x = %i-%02i-%02i\n",
266  record_date, 1900 + (record_date & 0x7F), (record_date >> 7) & 0xF,
267  (record_date >> 11) & 0x1F);
268 
269  av_log(s, AV_LOG_DEBUG, "expire: %x = %i-%02i-%02i\n",
270  expiration_date, 1900 + (expiration_date & 0x7F), (expiration_date >> 7) & 0xF,
271  (expiration_date >> 11) & 0x1F);
272 
273  if ((video_params >> 22) & 1)
274  av_log(s, AV_LOG_WARNING, "VBI data not yet supported\n");
275 
276  if ((lxf->channels = 1 << (disk_params >> 4 & 3) + 1)) {
277  if (!(st = avformat_new_stream(s, NULL)))
278  return AVERROR(ENOMEM);
279 
282  st->codecpar->channels = lxf->channels;
283 
284  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
285  }
286 
287  avio_skip(s->pb, lxf->extended_size);
288 
289  return 0;
290 }
291 
293 {
294  LXFDemuxContext *lxf = s->priv_data;
295  AVIOContext *pb = s->pb;
296  uint32_t stream;
297  int ret, ret2;
298 
299  if ((ret = get_packet_header(s)) < 0)
300  return ret;
301 
302  stream = lxf->packet_type;
303 
304  if (stream > 1) {
306  "got packet with illegal stream index %"PRIu32"\n", stream);
307  return FFERROR_REDO;
308  }
309 
310  if (stream == 1 && s->nb_streams < 2) {
311  av_log(s, AV_LOG_ERROR, "got audio packet without having an audio stream\n");
312  return AVERROR_INVALIDDATA;
313  }
314 
315  if ((ret2 = av_new_packet(pkt, ret)) < 0)
316  return ret2;
317 
318  if ((ret2 = avio_read(pb, pkt->data, ret)) != ret) {
319  return ret2 < 0 ? ret2 : AVERROR_EOF;
320  }
321 
322  pkt->stream_index = stream;
323 
324  if (!stream) {
325  //picture type (0 = closed I, 1 = open I, 2 = P, 3 = B)
326  if (((lxf->video_format >> 22) & 0x3) < 2)
328 
329  pkt->dts = lxf->frame_number++;
330  }
331 
332  return ret;
333 }
334 
336  .name = "lxf",
337  .long_name = NULL_IF_CONFIG_SMALL("VR native stream (LXF)"),
338  .priv_data_size = sizeof(LXFDemuxContext),
342  .codec_tag = (const AVCodecTag* const []){lxf_tags, 0},
343 };
LXFDemuxContext::extended_size
uint32_t extended_size
Definition: lxfdec.c:52
LXF_IDENT
#define LXF_IDENT
Definition: lxfdec.c:31
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
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:4519
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
FFERROR_REDO
#define FFERROR_REDO
Returned by demuxers to indicate that data was consumed but discarded (ignored streams or junk data).
Definition: internal.h:633
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
AV_CODEC_ID_RAWVIDEO
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:62
AV_CODEC_ID_PCM_S32LE_PLANAR
@ AV_CODEC_ID_PCM_S32LE_PLANAR
Definition: codec_id.h:330
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:26
AVPacket::data
uint8_t * data
Definition: packet.h:355
samples
FFmpeg Automated Testing Environment ************************************Introduction Using FATE from your FFmpeg source directory Submitting the results to the FFmpeg result aggregation server Uploading new samples to the fate suite FATE makefile targets and variables Makefile targets Makefile variables Examples Introduction **************FATE is an extended regression suite on the client side and a means for results aggregation and presentation on the server side The first part of this document explains how you can use FATE from your FFmpeg source directory to test your ffmpeg binary The second part describes how you can run FATE to submit the results to FFmpeg’s FATE server In any way you can have a look at the publicly viewable FATE results by visiting this as it can be seen if some test on some platform broke with their recent contribution This usually happens on the platforms the developers could not test on The second part of this document describes how you can run FATE to submit your results to FFmpeg’s FATE server If you want to submit your results be sure to check that your combination of OS and compiler is not already listed on the above mentioned website In the third part you can find a comprehensive listing of FATE makefile targets and variables Using FATE from your FFmpeg source directory **********************************************If you want to run FATE on your machine you need to have the samples in place You can get the samples via the build target fate rsync Use this command from the top level source this will cause FATE to fail NOTE To use a custom wrapper to run the pass ‘ target exec’ to ‘configure’ or set the TARGET_EXEC Make variable Submitting the results to the FFmpeg result aggregation server ****************************************************************To submit your results to the server you should run fate through the shell script ‘tests fate sh’ from the FFmpeg sources This script needs to be invoked with a configuration file as its first argument tests fate sh path to fate_config A configuration file template with comments describing the individual configuration variables can be found at ‘doc fate_config sh template’ Create a configuration that suits your based on the configuration template The ‘slot’ configuration variable can be any string that is not yet but it is suggested that you name it adhering to the following pattern ‘ARCH OS COMPILER COMPILER VERSION’ The configuration file itself will be sourced in a shell therefore all shell features may be used This enables you to setup the environment as you need it for your build For your first test runs the ‘fate_recv’ variable should be empty or commented out This will run everything as normal except that it will omit the submission of the results to the server The following files should be present in $workdir as specified in the configuration it may help to try out the ‘ssh’ command with one or more ‘ v’ options You should get detailed output concerning your SSH configuration and the authentication process The only thing left is to automate the execution of the fate sh script and the synchronisation of the samples directory Uploading new samples to the fate suite *****************************************If you need a sample uploaded send a mail to samples request This is for developers who have an account on the fate suite server If you upload new samples
Definition: fate.txt:139
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:388
AV_CODEC_ID_PCM_S16LE_PLANAR
@ AV_CODEC_ID_PCM_S16LE_PLANAR
Definition: codec_id.h:319
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
x
FFmpeg Automated Testing Environment ************************************Introduction Using FATE from your FFmpeg source directory Submitting the results to the FFmpeg result aggregation server Uploading new samples to the fate suite FATE makefile targets and variables Makefile targets Makefile variables Examples Introduction **************FATE is an extended regression suite on the client side and a means for results aggregation and presentation on the server side The first part of this document explains how you can use FATE from your FFmpeg source directory to test your ffmpeg binary The second part describes how you can run FATE to submit the results to FFmpeg’s FATE server In any way you can have a look at the publicly viewable FATE results by visiting this as it can be seen if some test on some platform broke with their recent contribution This usually happens on the platforms the developers could not test on The second part of this document describes how you can run FATE to submit your results to FFmpeg’s FATE server If you want to submit your results be sure to check that your combination of OS and compiler is not already listed on the above mentioned website In the third part you can find a comprehensive listing of FATE makefile targets and variables Using FATE from your FFmpeg source directory **********************************************If you want to run FATE on your machine you need to have the samples in place You can get the samples via the build target fate rsync Use this command from the top level source this will cause FATE to fail NOTE To use a custom wrapper to run the pass ‘ target exec’ to ‘configure’ or set the TARGET_EXEC Make variable Submitting the results to the FFmpeg result aggregation server ****************************************************************To submit your results to the server you should run fate through the shell script ‘tests fate sh’ from the FFmpeg sources This script needs to be invoked with a configuration file as its first argument tests fate sh path to fate_config A configuration file template with comments describing the individual configuration variables can be found at ‘doc fate_config sh template’ Create a configuration that suits your based on the configuration template The ‘slot’ configuration variable can be any string that is not yet but it is suggested that you name it adhering to the following pattern ‘ARCH OS COMPILER COMPILER VERSION’ The configuration file itself will be sourced in a shell therefore all shell features may be used This enables you to setup the environment as you need it for your build For your first test runs the ‘fate_recv’ variable should be empty or commented out This will run everything as normal except that it will omit the submission of the results to the server The following files should be present in $workdir as specified in the configuration it may help to try out the ‘ssh’ command with one or more ‘ v’ options You should get detailed output concerning your SSH configuration and the authentication process The only thing left is to automate the execution of the fate sh script and the synchronisation of the samples directory Uploading new samples to the fate suite *****************************************If you need a sample uploaded send a mail to samples request This is for developers who have an account on the fate suite server If you upload new please make sure they are as small as space on each network bandwidth and so on benefit from smaller test cases Also keep in mind older checkouts use existing sample that means in practice generally do not remove or overwrite files as it likely would break older checkouts or releases Also all needed samples for a commit should be ideally before the push If you need an account for frequently uploading samples or you wish to help others by doing that send a mail to ffmpeg devel rsync vauL Duo x
Definition: fate.txt:150
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:914
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVInputFormat
Definition: avformat.h:636
AVCodecTag
Definition: internal.h:42
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AV_CODEC_ID_PCM_LXF
@ AV_CODEC_ID_PCM_LXF
Definition: codec_id.h:326
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:88
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:641
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
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
AVStream::need_parsing
enum AVStreamParseType need_parsing
Definition: avformat.h:1083
channels
channels
Definition: aptx.h:33
AV_RL16
#define AV_RL16
Definition: intreadwrite.h:42
LXFDemuxContext::frame_number
int frame_number
current video frame
Definition: lxfdec.c:51
lxf_read_packet
static int lxf_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: lxfdec.c:292
LXF_MAX_PACKET_HEADER_SIZE
#define LXF_MAX_PACKET_HEADER_SIZE
Definition: lxfdec.c:29
AVFormatContext
Format I/O context.
Definition: avformat.h:1335
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1012
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
NULL
#define NULL
Definition: coverity.c:32
LXF_SAMPLERATE
#define LXF_SAMPLERATE
Definition: lxfdec.c:33
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
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
check_checksum
static int check_checksum(const uint8_t *header, int size)
Verify the checksum of an LXF packet header.
Definition: lxfdec.c:69
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
AV_CODEC_ID_MPEG1VIDEO
@ AV_CODEC_ID_MPEG1VIDEO
Definition: codec_id.h:50
AV_CODEC_ID_PCM_S24LE_PLANAR
@ AV_CODEC_ID_PCM_S24LE_PLANAR
Definition: codec_id.h:329
LXFDemuxContext
Definition: lxfdec.c:49
lxf_sync
static int lxf_sync(AVFormatContext *s, uint8_t *header)
Read input until we find the next ident.
Definition: lxfdec.c:86
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
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:186
ff_codec_get_id
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3158
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:4938
lxf_tags
static const AVCodecTag lxf_tags[]
Definition: lxfdec.c:35
size
int size
Definition: twinvq_data.h:11134
avpriv_report_missing_feature
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
header
static const uint8_t header[24]
Definition: sdr2.c:67
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:354
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:616
LXFDemuxContext::channels
int channels
number of audio channels. zero means no audio
Definition: lxfdec.c:50
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:361
version
version
Definition: libkvazaar.c:292
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
AV_CODEC_ID_MJPEG
@ AV_CODEC_ID_MJPEG
Definition: codec_id.h:56
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
AV_CODEC_ID_DVVIDEO
@ AV_CODEC_ID_DVVIDEO
Definition: codec_id.h:73
uint8_t
uint8_t
Definition: audio_convert.c:194
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:865
AVSTREAM_PARSE_HEADERS
@ AVSTREAM_PARSE_HEADERS
Only parse headers, do not repack.
Definition: avformat.h:787
avformat.h
ff_lxf_demuxer
AVInputFormat ff_lxf_demuxer
Definition: lxfdec.c:335
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
AV_RL32
#define AV_RL32
Definition: intreadwrite.h:146
lxf_read_header
static int lxf_read_header(AVFormatContext *s)
Definition: lxfdec.c:228
LXF_IDENT_LENGTH
#define LXF_IDENT_LENGTH
Definition: lxfdec.c:32
LXFDemuxContext::packet_type
uint32_t packet_type
Definition: lxfdec.c:52
LXFDemuxContext::video_format
uint32_t video_format
Definition: lxfdec.c:52
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:625
AVPacket::stream_index
int stream_index
Definition: packet.h:357
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
lxf_probe
static int lxf_probe(const AVProbeData *p)
Definition: lxfdec.c:55
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:332
bytestream.h
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
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
get_packet_header
static int get_packet_header(AVFormatContext *s)
Read and checksum the next packet header.
Definition: lxfdec.c:112
AV_CODEC_ID_MPEG2VIDEO
@ AV_CODEC_ID_MPEG2VIDEO
preferred ID for MPEG-1/2 video decoding
Definition: codec_id.h:51
LXF_HEADER_DATA_SIZE
#define LXF_HEADER_DATA_SIZE
Definition: lxfdec.c:30
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:356