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nuv.c
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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  */
69 static int get_codec_data(AVIOContext *pb, AVStream *vst,
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);
118  ast->codecpar->channels = avio_rl32(pb);
119  ast->codecpar->channel_layout = 0;
120 
123  if (id == AV_CODEC_ID_NONE) {
124  id = ff_codec_get_id(nuv_audio_tags, ast->codecpar->codec_tag);
125  if (id == AV_CODEC_ID_PCM_S16LE)
127  0, 0, ~1);
128  }
129  ast->codecpar->codec_id = id;
130 
132  } else
133  avio_skip(pb, 4 * 4);
134 
135  size -= 6 * 4;
136  avio_skip(pb, size);
137  return 0;
138  case NUV_SEEKP:
139  size = 11;
140  break;
141  default:
142  avio_skip(pb, 7);
143  size = PKTSIZE(avio_rl32(pb));
144  break;
145  }
146  avio_skip(pb, size);
147  }
148 
149  return 0;
150 }
151 
153 {
154  NUVContext *ctx = s->priv_data;
155  AVIOContext *pb = s->pb;
156  char id_string[12];
157  double aspect, fps;
158  int is_mythtv, width, height, v_packs, a_packs, ret;
159  AVStream *vst = NULL, *ast = NULL;
160 
161  avio_read(pb, id_string, 12);
162  is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
163  avio_skip(pb, 5); // version string
164  avio_skip(pb, 3); // padding
165  width = avio_rl32(pb);
166  height = avio_rl32(pb);
167  avio_rl32(pb); // unused, "desiredwidth"
168  avio_rl32(pb); // unused, "desiredheight"
169  avio_r8(pb); // 'P' == progressive, 'I' == interlaced
170  avio_skip(pb, 3); // padding
171  aspect = av_int2double(avio_rl64(pb));
172  if (aspect > 0.9999 && aspect < 1.0001)
173  aspect = 4.0 / 3.0;
174  fps = av_int2double(avio_rl64(pb));
175  if (fps < 0.0f) {
176  if (s->error_recognition & AV_EF_EXPLODE) {
177  av_log(s, AV_LOG_ERROR, "Invalid frame rate %f\n", fps);
178  return AVERROR_INVALIDDATA;
179  } else {
180  av_log(s, AV_LOG_WARNING, "Invalid frame rate %f, setting to 0.\n", fps);
181  fps = 0.0f;
182  }
183  }
184 
185  // number of packets per stream type, -1 means unknown, e.g. streaming
186  v_packs = avio_rl32(pb);
187  a_packs = avio_rl32(pb);
188  avio_rl32(pb); // text
189 
190  avio_rl32(pb); // keyframe distance (?)
191 
192  if (v_packs) {
193  vst = avformat_new_stream(s, NULL);
194  if (!vst)
195  return AVERROR(ENOMEM);
196  ctx->v_id = vst->index;
197 
198  ret = av_image_check_size(width, height, 0, s);
199  if (ret < 0)
200  return ret;
201 
204  vst->codecpar->width = width;
205  vst->codecpar->height = height;
206  vst->codecpar->bits_per_coded_sample = 10;
207  vst->sample_aspect_ratio = av_d2q(aspect * height / width,
208  10000);
209 #if FF_API_R_FRAME_RATE
210  vst->r_frame_rate =
211 #endif
212  vst->avg_frame_rate = av_d2q(fps, 60000);
213  avpriv_set_pts_info(vst, 32, 1, 1000);
214  } else
215  ctx->v_id = -1;
216 
217  if (a_packs) {
218  ast = avformat_new_stream(s, NULL);
219  if (!ast)
220  return AVERROR(ENOMEM);
221  ctx->a_id = ast->index;
222 
223  ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
224  ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
225  ast->codecpar->channels = 2;
226  ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
227  ast->codecpar->sample_rate = 44100;
228  ast->codecpar->bit_rate = 2 * 2 * 44100 * 8;
229  ast->codecpar->block_align = 2 * 2;
230  ast->codecpar->bits_per_coded_sample = 16;
231  avpriv_set_pts_info(ast, 32, 1, 1000);
232  } else
233  ctx->a_id = -1;
234 
235  if ((ret = get_codec_data(pb, vst, ast, is_mythtv)) < 0)
236  return ret;
237 
238  ctx->rtjpg_video = vst && vst->codecpar->codec_id == AV_CODEC_ID_NUV;
239 
240  return 0;
241 }
242 
243 #define HDRSIZE 12
244 
246 {
247  NUVContext *ctx = s->priv_data;
248  AVIOContext *pb = s->pb;
249  uint8_t hdr[HDRSIZE];
250  nuv_frametype frametype;
251  int ret, size;
252 
253  while (!avio_feof(pb)) {
254  int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
255  uint64_t pos = avio_tell(pb);
256 
257  ret = avio_read(pb, hdr, HDRSIZE);
258  if (ret < HDRSIZE)
259  return ret < 0 ? ret : AVERROR(EIO);
260 
261  frametype = hdr[0];
262  size = PKTSIZE(AV_RL32(&hdr[8]));
263 
264  switch (frametype) {
265  case NUV_EXTRADATA:
266  if (!ctx->rtjpg_video) {
267  avio_skip(pb, size);
268  break;
269  }
270  case NUV_VIDEO:
271  if (ctx->v_id < 0) {
272  av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
273  avio_skip(pb, size);
274  break;
275  }
276  ret = av_new_packet(pkt, copyhdrsize + size);
277  if (ret < 0)
278  return ret;
279 
280  pkt->pos = pos;
281  pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
282  pkt->pts = AV_RL32(&hdr[4]);
283  pkt->stream_index = ctx->v_id;
284  memcpy(pkt->data, hdr, copyhdrsize);
285  ret = avio_read(pb, pkt->data + copyhdrsize, size);
286  if (ret < 0) {
287  av_packet_unref(pkt);
288  return ret;
289  }
290  if (ret < size)
291  av_shrink_packet(pkt, copyhdrsize + ret);
292  return 0;
293  case NUV_AUDIO:
294  if (ctx->a_id < 0) {
295  av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
296  avio_skip(pb, size);
297  break;
298  }
299  ret = av_get_packet(pb, pkt, size);
300  pkt->flags |= AV_PKT_FLAG_KEY;
301  pkt->pos = pos;
302  pkt->pts = AV_RL32(&hdr[4]);
303  pkt->stream_index = ctx->a_id;
304  if (ret < 0)
305  return ret;
306  return 0;
307  case NUV_SEEKP:
308  // contains no data, size value is invalid
309  break;
310  default:
311  avio_skip(pb, size);
312  break;
313  }
314  }
315 
316  return AVERROR(EIO);
317 }
318 
319 /**
320  * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
321  * \return 1 if the syncword is found 0 otherwise.
322  */
323 static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
324  AVIOContext *pb = s->pb;
325  uint32_t tag = 0;
326  while(!avio_feof(pb) && avio_tell(pb) < pos_limit) {
327  tag = (tag << 8) | avio_r8(pb);
328  if (tag == MKBETAG('R','T','j','j') &&
329  (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
330  (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
331  return 1;
332  }
333  return 0;
334 }
335 
336 /**
337  * \brief attempts to read a timestamp from stream at the given stream position
338  * \return timestamp if successful and AV_NOPTS_VALUE if failure
339  */
340 static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
341  int64_t *ppos, int64_t pos_limit)
342 {
343  NUVContext *ctx = s->priv_data;
344  AVIOContext *pb = s->pb;
345  uint8_t hdr[HDRSIZE];
346  nuv_frametype frametype;
347  int size, key, idx;
348  int64_t pos, dts;
349 
350  if (avio_seek(pb, *ppos, SEEK_SET) < 0)
351  return AV_NOPTS_VALUE;
352 
353  if (!nuv_resync(s, pos_limit))
354  return AV_NOPTS_VALUE;
355 
356  while (!avio_feof(pb) && avio_tell(pb) < pos_limit) {
357  if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
358  return AV_NOPTS_VALUE;
359  frametype = hdr[0];
360  size = PKTSIZE(AV_RL32(&hdr[8]));
361  switch (frametype) {
362  case NUV_SEEKP:
363  break;
364  case NUV_AUDIO:
365  case NUV_VIDEO:
366  if (frametype == NUV_VIDEO) {
367  idx = ctx->v_id;
368  key = hdr[2] == 0;
369  } else {
370  idx = ctx->a_id;
371  key = 1;
372  }
373  if (stream_index == idx) {
374 
375  pos = avio_tell(s->pb) - HDRSIZE;
376  dts = AV_RL32(&hdr[4]);
377 
378  // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
379  av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
380  key ? AVINDEX_KEYFRAME : 0);
381 
382  *ppos = pos;
383  return dts;
384  }
385  default:
386  avio_skip(pb, size);
387  break;
388  }
389  }
390  return AV_NOPTS_VALUE;
391 }
392 
393 
395  .name = "nuv",
396  .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
397  .priv_data_size = sizeof(NUVContext),
401  .read_timestamp = nuv_read_dts,
403 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:147
#define AVERROR_INVALIDDATA
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:1909
enum AVCodecID id
Definition: mxfenc.c:104
Definition: nuv.c:36
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2955
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:1608
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:4493
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3939
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:943
int index
stream index in AVFormatContext
Definition: avformat.h:877
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:230
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:304
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
Format I/O context.
Definition: avformat.h:1325
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:4005
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:751
enum AVStreamParseType need_parsing
Definition: avformat.h:1063
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4131
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1393
#define height
uint8_t * data
Definition: avcodec.h:1588
uint32_t tag
Definition: movenc.c:1376
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
static int get_codec_data(AVIOContext *pb, AVStream *vst, AVStream *ast, int myth)
read until we found all data needed for decoding
Definition: nuv.c:69
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
nuv_frametype
Definition: nuv.c:42
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4041
#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
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1620
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:823
#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:720
#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:176
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:515
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3935
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:340
static int nuv_probe(AVProbeData *p)
Definition: nuv.c:50
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:954
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1594
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3957
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:589
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:461
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:251
audio channel layout utility functions
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:32
#define width
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_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2955
AVInputFormat ff_nuv_demuxer
Definition: nuv.c:394
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
#define PKTSIZE(s)
little macro to sanitize packet size
Definition: nuv.c:60
#define HDRSIZE
Definition: nuv.c:243
AVIOContext * pb
I/O context.
Definition: avformat.h:1367
int a_id
Definition: nuv.c:38
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:563
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:485
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:2967
int rtjpg_video
Definition: nuv.c:39
This structure contains the data a format has to probe a file.
Definition: avformat.h:459
static int nuv_resync(AVFormatContext *s, int64_t pos_limit)
looks for the string RTjjjjjjjjjj in the stream too resync reading
Definition: nuv.c:323
static int flags
Definition: cpu.c:47
Definition: nuv.c:46
int sample_rate
Audio only.
Definition: avcodec.h:4049
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:471
full parsing and repack
Definition: avformat.h:806
Main libavformat public API header.
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:191
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1566
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:3137
static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nuv.c:245
#define MKBETAG(a, b, c, d)
Definition: common.h:343
Definition: nuv.c:45
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:3981
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3953
int channels
Audio only.
Definition: avcodec.h:4045
Definition: nuv.c:43
#define av_freep(p)
static int nuv_header(AVFormatContext *s)
Definition: nuv.c:152
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
AVCodecParameters * codecpar
Definition: avformat.h:1228
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:328
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3943
static const AVCodecTag nuv_audio_tags[]
Definition: nuv.c:30
int stream_index
Definition: avcodec.h:1590
#define MKTAG(a, b, c, d)
Definition: common.h:342
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:1090
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1565
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:728
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1581
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240