FFmpeg  3.4.9
nuv.c
Go to the documentation of this file.
1 /*
2  * NuppelVideo demuxer.
3  * Copyright (c) 2006 Reimar Doeffinger
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 
23 #include "libavutil/imgutils.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/intfloat.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "riff.h"
29 
30 static const AVCodecTag nuv_audio_tags[] = {
31  { AV_CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
32  { AV_CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') },
33  { AV_CODEC_ID_NONE, 0 },
34 };
35 
36 typedef struct NUVContext {
37  int v_id;
38  int a_id;
40 } NUVContext;
41 
42 typedef enum {
43  NUV_VIDEO = 'V',
45  NUV_AUDIO = 'A',
46  NUV_SEEKP = 'R',
49 
50 static int nuv_probe(AVProbeData *p)
51 {
52  if (!memcmp(p->buf, "NuppelVideo", 12))
53  return AVPROBE_SCORE_MAX;
54  if (!memcmp(p->buf, "MythTVVideo", 12))
55  return AVPROBE_SCORE_MAX;
56  return 0;
57 }
58 
59 /// little macro to sanitize packet size
60 #define PKTSIZE(s) (s & 0xffffff)
61 
62 /**
63  * @brief read until we found all data needed for decoding
64  * @param vst video stream of which to change parameters
65  * @param ast video stream of which to change parameters
66  * @param myth set if this is a MythTVVideo format file
67  * @return 0 or AVERROR code
68  */
70  AVStream *ast, int myth)
71 {
72  nuv_frametype frametype;
73 
74  if (!vst && !myth)
75  return 1; // no codec data needed
76  while (!avio_feof(pb)) {
77  int size, subtype;
78 
79  frametype = avio_r8(pb);
80  switch (frametype) {
81  case NUV_EXTRADATA:
82  subtype = avio_r8(pb);
83  avio_skip(pb, 6);
84  size = PKTSIZE(avio_rl32(pb));
85  if (vst && subtype == 'R') {
86  if (vst->codecpar->extradata) {
87  av_freep(&vst->codecpar->extradata);
88  vst->codecpar->extradata_size = 0;
89  }
90  if (ff_get_extradata(NULL, vst->codecpar, pb, size) < 0)
91  return AVERROR(ENOMEM);
92  size = 0;
93  if (!myth)
94  return 0;
95  }
96  break;
97  case NUV_MYTHEXT:
98  avio_skip(pb, 7);
99  size = PKTSIZE(avio_rl32(pb));
100  if (size != 128 * 4)
101  break;
102  avio_rl32(pb); // version
103  if (vst) {
104  vst->codecpar->codec_tag = avio_rl32(pb);
105  vst->codecpar->codec_id =
107  if (vst->codecpar->codec_tag == MKTAG('R', 'J', 'P', 'G'))
109  } else
110  avio_skip(pb, 4);
111 
112  if (ast) {
113  int id;
114 
115  ast->codecpar->codec_tag = avio_rl32(pb);
116  ast->codecpar->sample_rate = avio_rl32(pb);
117  if (ast->codecpar->sample_rate <= 0) {
118  av_log(s, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
119  return AVERROR_INVALIDDATA;
120  }
122  ast->codecpar->channels = avio_rl32(pb);
123  ast->codecpar->channel_layout = 0;
124  if (ast->codecpar->channels <= 0) {
125  av_log(s, AV_LOG_ERROR, "Invalid channels %d\n", ast->codecpar->channels);
126  return AVERROR_INVALIDDATA;
127  }
128 
131  if (id == AV_CODEC_ID_NONE) {
132  id = ff_codec_get_id(nuv_audio_tags, ast->codecpar->codec_tag);
133  if (id == AV_CODEC_ID_PCM_S16LE)
135  0, 0, ~1);
136  }
137  ast->codecpar->codec_id = id;
138 
140  } else
141  avio_skip(pb, 4 * 4);
142 
143  size -= 6 * 4;
144  avio_skip(pb, size);
145  return 0;
146  case NUV_SEEKP:
147  size = 11;
148  break;
149  default:
150  avio_skip(pb, 7);
151  size = PKTSIZE(avio_rl32(pb));
152  break;
153  }
154  avio_skip(pb, size);
155  }
156 
157  return 0;
158 }
159 
161 {
162  NUVContext *ctx = s->priv_data;
163  AVIOContext *pb = s->pb;
164  char id_string[12];
165  double aspect, fps;
166  int is_mythtv, width, height, v_packs, a_packs, ret;
167  AVStream *vst = NULL, *ast = NULL;
168 
169  avio_read(pb, id_string, 12);
170  is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
171  avio_skip(pb, 5); // version string
172  avio_skip(pb, 3); // padding
173  width = avio_rl32(pb);
174  height = avio_rl32(pb);
175  avio_rl32(pb); // unused, "desiredwidth"
176  avio_rl32(pb); // unused, "desiredheight"
177  avio_r8(pb); // 'P' == progressive, 'I' == interlaced
178  avio_skip(pb, 3); // padding
179  aspect = av_int2double(avio_rl64(pb));
180  if (aspect > 0.9999 && aspect < 1.0001)
181  aspect = 4.0 / 3.0;
182  fps = av_int2double(avio_rl64(pb));
183  if (fps < 0.0f) {
184  if (s->error_recognition & AV_EF_EXPLODE) {
185  av_log(s, AV_LOG_ERROR, "Invalid frame rate %f\n", fps);
186  return AVERROR_INVALIDDATA;
187  } else {
188  av_log(s, AV_LOG_WARNING, "Invalid frame rate %f, setting to 0.\n", fps);
189  fps = 0.0f;
190  }
191  }
192 
193  // number of packets per stream type, -1 means unknown, e.g. streaming
194  v_packs = avio_rl32(pb);
195  a_packs = avio_rl32(pb);
196  avio_rl32(pb); // text
197 
198  avio_rl32(pb); // keyframe distance (?)
199 
200  if (v_packs) {
201  vst = avformat_new_stream(s, NULL);
202  if (!vst)
203  return AVERROR(ENOMEM);
204  ctx->v_id = vst->index;
205 
206  ret = av_image_check_size(width, height, 0, s);
207  if (ret < 0)
208  return ret;
209 
212  vst->codecpar->width = width;
213  vst->codecpar->height = height;
214  vst->codecpar->bits_per_coded_sample = 10;
215  vst->sample_aspect_ratio = av_d2q(aspect * height / width,
216  10000);
217 #if FF_API_R_FRAME_RATE
218  vst->r_frame_rate =
219 #endif
220  vst->avg_frame_rate = av_d2q(fps, 60000);
221  avpriv_set_pts_info(vst, 32, 1, 1000);
222  } else
223  ctx->v_id = -1;
224 
225  if (a_packs) {
226  ast = avformat_new_stream(s, NULL);
227  if (!ast)
228  return AVERROR(ENOMEM);
229  ctx->a_id = ast->index;
230 
231  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
232  ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
233  ast->codecpar->channels = 2;
234  ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
235  ast->codecpar->sample_rate = 44100;
236  ast->codecpar->bit_rate = 2 * 2 * 44100 * 8;
237  ast->codecpar->block_align = 2 * 2;
238  ast->codecpar->bits_per_coded_sample = 16;
239  avpriv_set_pts_info(ast, 32, 1, 1000);
240  } else
241  ctx->a_id = -1;
242 
243  if ((ret = get_codec_data(s, pb, vst, ast, is_mythtv)) < 0)
244  return ret;
245 
246  ctx->rtjpg_video = vst && vst->codecpar->codec_id == AV_CODEC_ID_NUV;
247 
248  return 0;
249 }
250 
251 #define HDRSIZE 12
252 
254 {
255  NUVContext *ctx = s->priv_data;
256  AVIOContext *pb = s->pb;
257  uint8_t hdr[HDRSIZE];
258  nuv_frametype frametype;
259  int ret, size;
260 
261  while (!avio_feof(pb)) {
262  int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
263  uint64_t pos = avio_tell(pb);
264 
265  ret = avio_read(pb, hdr, HDRSIZE);
266  if (ret < HDRSIZE)
267  return ret < 0 ? ret : AVERROR(EIO);
268 
269  frametype = hdr[0];
270  size = PKTSIZE(AV_RL32(&hdr[8]));
271 
272  switch (frametype) {
273  case NUV_EXTRADATA:
274  if (!ctx->rtjpg_video) {
275  avio_skip(pb, size);
276  break;
277  }
278  case NUV_VIDEO:
279  if (ctx->v_id < 0) {
280  av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
281  avio_skip(pb, size);
282  break;
283  }
284  ret = av_new_packet(pkt, copyhdrsize + size);
285  if (ret < 0)
286  return ret;
287 
288  pkt->pos = pos;
289  pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
290  pkt->pts = AV_RL32(&hdr[4]);
291  pkt->stream_index = ctx->v_id;
292  memcpy(pkt->data, hdr, copyhdrsize);
293  ret = avio_read(pb, pkt->data + copyhdrsize, size);
294  if (ret < 0) {
295  av_packet_unref(pkt);
296  return ret;
297  }
298  if (ret < size)
299  av_shrink_packet(pkt, copyhdrsize + ret);
300  return 0;
301  case NUV_AUDIO:
302  if (ctx->a_id < 0) {
303  av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
304  avio_skip(pb, size);
305  break;
306  }
307  ret = av_get_packet(pb, pkt, size);
308  pkt->flags |= AV_PKT_FLAG_KEY;
309  pkt->pos = pos;
310  pkt->pts = AV_RL32(&hdr[4]);
311  pkt->stream_index = ctx->a_id;
312  if (ret < 0)
313  return ret;
314  return 0;
315  case NUV_SEEKP:
316  // contains no data, size value is invalid
317  break;
318  default:
319  avio_skip(pb, size);
320  break;
321  }
322  }
323 
324  return AVERROR(EIO);
325 }
326 
327 /**
328  * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
329  * \return 1 if the syncword is found 0 otherwise.
330  */
331 static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
332  AVIOContext *pb = s->pb;
333  uint32_t tag = 0;
334  while(!avio_feof(pb) && avio_tell(pb) < pos_limit) {
335  tag = (tag << 8) | avio_r8(pb);
336  if (tag == MKBETAG('R','T','j','j') &&
337  (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
338  (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
339  return 1;
340  }
341  return 0;
342 }
343 
344 /**
345  * \brief attempts to read a timestamp from stream at the given stream position
346  * \return timestamp if successful and AV_NOPTS_VALUE if failure
347  */
348 static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
349  int64_t *ppos, int64_t pos_limit)
350 {
351  NUVContext *ctx = s->priv_data;
352  AVIOContext *pb = s->pb;
353  uint8_t hdr[HDRSIZE];
354  nuv_frametype frametype;
355  int size, key, idx;
356  int64_t pos, dts;
357 
358  if (avio_seek(pb, *ppos, SEEK_SET) < 0)
359  return AV_NOPTS_VALUE;
360 
361  if (!nuv_resync(s, pos_limit))
362  return AV_NOPTS_VALUE;
363 
364  while (!avio_feof(pb) && avio_tell(pb) < pos_limit) {
365  if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
366  return AV_NOPTS_VALUE;
367  frametype = hdr[0];
368  size = PKTSIZE(AV_RL32(&hdr[8]));
369  switch (frametype) {
370  case NUV_SEEKP:
371  break;
372  case NUV_AUDIO:
373  case NUV_VIDEO:
374  if (frametype == NUV_VIDEO) {
375  idx = ctx->v_id;
376  key = hdr[2] == 0;
377  } else {
378  idx = ctx->a_id;
379  key = 1;
380  }
381  if (stream_index == idx) {
382 
383  pos = avio_tell(s->pb) - HDRSIZE;
384  dts = AV_RL32(&hdr[4]);
385 
386  // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
387  av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
388  key ? AVINDEX_KEYFRAME : 0);
389 
390  *ppos = pos;
391  return dts;
392  }
393  default:
394  avio_skip(pb, size);
395  break;
396  }
397  }
398  return AV_NOPTS_VALUE;
399 }
400 
401 
403  .name = "nuv",
404  .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
405  .priv_data_size = sizeof(NUVContext),
409  .read_timestamp = nuv_read_dts,
411 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int size
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:1994
Definition: nuv.c:36
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:3067
misc image utilities
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1699
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:101
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:4756
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:4152
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:959
int index
stream index in AVFormatContext
Definition: avformat.h:890
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:244
static int get_codec_data(AVFormatContext *s, AVIOContext *pb, AVStream *vst, AVStream *ast, int myth)
read until we found all data needed for decoding
Definition: nuv.c:69
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
Format I/O context.
Definition: avformat.h:1349
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
uint8_t
int width
Video only.
Definition: avcodec.h:4218
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:789
enum AVStreamParseType need_parsing
Definition: avformat.h:1081
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4383
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1417
#define height
uint8_t * data
Definition: avcodec.h:1679
static int flags
Definition: log.c:57
uint32_t tag
Definition: movenc.c:1414
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:292
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:556
nuv_frametype
Definition: nuv.c:42
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4254
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:636
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1711
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
#define AVINDEX_KEYFRAME
Definition: avformat.h:827
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:758
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:181
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:557
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:4148
static int64_t nuv_read_dts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
attempts to read a timestamp from stream at the given stream position
Definition: nuv.c:348
uint16_t width
Definition: gdv.c:47
static int nuv_probe(AVProbeData *p)
Definition: nuv.c:50
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:970
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1685
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:4170
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:627
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
int v_id
Definition: nuv.c:37
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:281
audio channel layout utility functions
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:32
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
AVFormatContext * ctx
Definition: movenc.c:48
#define AV_RL32
Definition: intreadwrite.h:146
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:3061
AVInputFormat ff_nuv_demuxer
Definition: nuv.c:402
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:528
Stream structure.
Definition: avformat.h:889
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define PKTSIZE(s)
little macro to sanitize packet size
Definition: nuv.c:60
#define HDRSIZE
Definition: nuv.c:251
AVIOContext * pb
I/O context.
Definition: avformat.h:1391
int a_id
Definition: nuv.c:38
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:618
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:487
enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
Select a PCM codec based on the given parameters.
Definition: utils.c:3079
int rtjpg_video
Definition: nuv.c:39
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
static int nuv_resync(AVFormatContext *s, int64_t pos_limit)
looks for the string RTjjjjjjjjjj in the stream too resync reading
Definition: nuv.c:331
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
Definition: nuv.c:46
int sample_rate
Audio only.
Definition: avcodec.h:4262
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:473
full parsing and repack
Definition: avformat.h:810
Main libavformat public API header.
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:194
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1594
int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: utils.c:3251
static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nuv.c:253
#define MKBETAG(a, b, c, d)
Definition: common.h:343
Definition: nuv.c:45
void * priv_data
Format private data.
Definition: avformat.h:1377
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4194
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:4166
int channels
Audio only.
Definition: avcodec.h:4258
Definition: nuv.c:43
#define av_freep(p)
static int nuv_header(AVFormatContext *s)
Definition: nuv.c:160
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:664
AVCodecParameters * codecpar
Definition: avformat.h:1252
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:356
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:4156
static const AVCodecTag nuv_audio_tags[]
Definition: nuv.c:30
int stream_index
Definition: avcodec.h:1681
#define MKTAG(a, b, c, d)
Definition: common.h:342
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:1108
enum AVCodecID id
This structure stores compressed data.
Definition: avcodec.h:1656
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:766
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1672
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248