FFmpeg  2.1.1
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 
22 #include "libavutil/channel_layout.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/intfloat.h"
25 #include "avformat.h"
26 #include "internal.h"
27 #include "riff.h"
28 
29 static const AVCodecTag nuv_audio_tags[] = {
30  { AV_CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
31  { AV_CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') },
32  { AV_CODEC_ID_NONE, 0 },
33 };
34 
35 typedef struct {
36  int v_id;
37  int a_id;
39 } NUVContext;
40 
41 typedef enum {
42  NUV_VIDEO = 'V',
44  NUV_AUDIO = 'A',
45  NUV_SEEKP = 'R',
48 
49 static int nuv_probe(AVProbeData *p)
50 {
51  if (!memcmp(p->buf, "NuppelVideo", 12))
52  return AVPROBE_SCORE_MAX;
53  if (!memcmp(p->buf, "MythTVVideo", 12))
54  return AVPROBE_SCORE_MAX;
55  return 0;
56 }
57 
58 /// little macro to sanitize packet size
59 #define PKTSIZE(s) (s & 0xffffff)
60 
61 /**
62  * @brief read until we found all data needed for decoding
63  * @param vst video stream of which to change parameters
64  * @param ast video stream of which to change parameters
65  * @param myth set if this is a MythTVVideo format file
66  * @return 0 or AVERROR code
67  */
68 static int get_codec_data(AVIOContext *pb, AVStream *vst,
69  AVStream *ast, int myth)
70 {
71  nuv_frametype frametype;
72 
73  if (!vst && !myth)
74  return 1; // no codec data needed
75  while (!url_feof(pb)) {
76  int size, subtype;
77 
78  frametype = avio_r8(pb);
79  switch (frametype) {
80  case NUV_EXTRADATA:
81  subtype = avio_r8(pb);
82  avio_skip(pb, 6);
83  size = PKTSIZE(avio_rl32(pb));
84  if (vst && subtype == 'R') {
85  if (vst->codec->extradata) {
86  av_freep(&vst->codec->extradata);
87  vst->codec->extradata_size = 0;
88  }
89  if (ff_alloc_extradata(vst->codec, size))
90  return AVERROR(ENOMEM);
91  avio_read(pb, vst->codec->extradata, size);
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->codec->codec_tag = avio_rl32(pb);
105  vst->codec->codec_id =
107  if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
109  } else
110  avio_skip(pb, 4);
111 
112  if (ast) {
113  int id;
114 
115  ast->codec->codec_tag = avio_rl32(pb);
116  ast->codec->sample_rate = avio_rl32(pb);
118  ast->codec->channels = avio_rl32(pb);
119  ast->codec->channel_layout = 0;
120 
123  if (id == AV_CODEC_ID_NONE) {
124  id = ff_codec_get_id(nuv_audio_tags, ast->codec->codec_tag);
125  if (id == AV_CODEC_ID_PCM_S16LE)
127  0, 0, ~1);
128  }
129  ast->codec->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 
176  // number of packets per stream type, -1 means unknown, e.g. streaming
177  v_packs = avio_rl32(pb);
178  a_packs = avio_rl32(pb);
179  avio_rl32(pb); // text
180 
181  avio_rl32(pb); // keyframe distance (?)
182 
183  if (v_packs) {
184  vst = avformat_new_stream(s, NULL);
185  if (!vst)
186  return AVERROR(ENOMEM);
187  ctx->v_id = vst->index;
188 
191  vst->codec->width = width;
192  vst->codec->height = height;
193  vst->codec->bits_per_coded_sample = 10;
194  vst->sample_aspect_ratio = av_d2q(aspect * height / width,
195  10000);
196 #if FF_API_R_FRAME_RATE
197  vst->r_frame_rate =
198 #endif
199  vst->avg_frame_rate = av_d2q(fps, 60000);
200  avpriv_set_pts_info(vst, 32, 1, 1000);
201  } else
202  ctx->v_id = -1;
203 
204  if (a_packs) {
205  ast = avformat_new_stream(s, NULL);
206  if (!ast)
207  return AVERROR(ENOMEM);
208  ctx->a_id = ast->index;
209 
210  ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
211  ast->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
212  ast->codec->channels = 2;
213  ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
214  ast->codec->sample_rate = 44100;
215  ast->codec->bit_rate = 2 * 2 * 44100 * 8;
216  ast->codec->block_align = 2 * 2;
217  ast->codec->bits_per_coded_sample = 16;
218  avpriv_set_pts_info(ast, 32, 1, 1000);
219  } else
220  ctx->a_id = -1;
221 
222  if ((ret = get_codec_data(pb, vst, ast, is_mythtv)) < 0)
223  return ret;
224 
225  ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
226 
227  return 0;
228 }
229 
230 #define HDRSIZE 12
231 
233 {
234  NUVContext *ctx = s->priv_data;
235  AVIOContext *pb = s->pb;
236  uint8_t hdr[HDRSIZE];
237  nuv_frametype frametype;
238  int ret, size;
239 
240  while (!url_feof(pb)) {
241  int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
242  uint64_t pos = avio_tell(pb);
243 
244  ret = avio_read(pb, hdr, HDRSIZE);
245  if (ret < HDRSIZE)
246  return ret < 0 ? ret : AVERROR(EIO);
247 
248  frametype = hdr[0];
249  size = PKTSIZE(AV_RL32(&hdr[8]));
250 
251  switch (frametype) {
252  case NUV_EXTRADATA:
253  if (!ctx->rtjpg_video) {
254  avio_skip(pb, size);
255  break;
256  }
257  case NUV_VIDEO:
258  if (ctx->v_id < 0) {
259  av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
260  avio_skip(pb, size);
261  break;
262  }
263  ret = av_new_packet(pkt, copyhdrsize + size);
264  if (ret < 0)
265  return ret;
266 
267  pkt->pos = pos;
268  pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
269  pkt->pts = AV_RL32(&hdr[4]);
270  pkt->stream_index = ctx->v_id;
271  memcpy(pkt->data, hdr, copyhdrsize);
272  ret = avio_read(pb, pkt->data + copyhdrsize, size);
273  if (ret < 0) {
274  av_free_packet(pkt);
275  return ret;
276  }
277  if (ret < size)
278  av_shrink_packet(pkt, copyhdrsize + ret);
279  return 0;
280  case NUV_AUDIO:
281  if (ctx->a_id < 0) {
282  av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
283  avio_skip(pb, size);
284  break;
285  }
286  ret = av_get_packet(pb, pkt, size);
287  pkt->flags |= AV_PKT_FLAG_KEY;
288  pkt->pos = pos;
289  pkt->pts = AV_RL32(&hdr[4]);
290  pkt->stream_index = ctx->a_id;
291  if (ret < 0)
292  return ret;
293  return 0;
294  case NUV_SEEKP:
295  // contains no data, size value is invalid
296  break;
297  default:
298  avio_skip(pb, size);
299  break;
300  }
301  }
302 
303  return AVERROR(EIO);
304 }
305 
306 /**
307  * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
308  * \return 1 if the syncword is found 0 otherwise.
309  */
310 static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
311  AVIOContext *pb = s->pb;
312  uint32_t tag = 0;
313  while(!url_feof(pb) && avio_tell(pb) < pos_limit) {
314  tag = (tag << 8) | avio_r8(pb);
315  if (tag == MKBETAG('R','T','j','j') &&
316  (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
317  (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
318  return 1;
319  }
320  return 0;
321 }
322 
323 /**
324  * \brief attempts to read a timestamp from stream at the given stream position
325  * \return timestamp if successful and AV_NOPTS_VALUE if failure
326  */
327 static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
328  int64_t *ppos, int64_t pos_limit)
329 {
330  NUVContext *ctx = s->priv_data;
331  AVIOContext *pb = s->pb;
332  uint8_t hdr[HDRSIZE];
333  nuv_frametype frametype;
334  int size, key, idx;
335  int64_t pos, dts;
336 
337  if (avio_seek(pb, *ppos, SEEK_SET) < 0)
338  return AV_NOPTS_VALUE;
339 
340  if (!nuv_resync(s, pos_limit))
341  return AV_NOPTS_VALUE;
342 
343  while (!url_feof(pb) && avio_tell(pb) < pos_limit) {
344  if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
345  return AV_NOPTS_VALUE;
346  frametype = hdr[0];
347  size = PKTSIZE(AV_RL32(&hdr[8]));
348  switch (frametype) {
349  case NUV_SEEKP:
350  break;
351  case NUV_AUDIO:
352  case NUV_VIDEO:
353  if (frametype == NUV_VIDEO) {
354  idx = ctx->v_id;
355  key = hdr[2] == 0;
356  } else {
357  idx = ctx->a_id;
358  key = 1;
359  }
360  if (stream_index == idx) {
361 
362  pos = avio_tell(s->pb) - HDRSIZE;
363  dts = AV_RL32(&hdr[4]);
364 
365  // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
366  av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
367  key ? AVINDEX_KEYFRAME : 0);
368 
369  *ppos = pos;
370  return dts;
371  }
372  default:
373  avio_skip(pb, size);
374  break;
375  }
376  }
377  return AV_NOPTS_VALUE;
378 }
379 
380 
382  .name = "nuv",
383  .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
384  .priv_data_size = sizeof(NUVContext),
388  .read_timestamp = nuv_read_dts,
390 };
const char * s
Definition: avisynth_c.h:668
Bytestream IO Context.
Definition: avio.h:68
int size
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:279
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:1675
enum AVCodecID id
Definition: mxfenc.c:90
Definition: nuv.c:35
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2556
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:478
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1092
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:103
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:3922
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:686
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:733
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:593
int index
stream index in AVFormatContext
Definition: avformat.h:668
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:624
#define AV_CH_LAYOUT_STEREO
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:471
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1254
void av_freep(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:234
Format I/O context.
Definition: avformat.h:968
uint8_t
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:336
enum AVStreamParseType need_parsing
Definition: avformat.h:812
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:248
uint32_t tag
Definition: movenc.c:961
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:68
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2563
nuv_frametype
Definition: nuv.c:41
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3348
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:200
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1113
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:83
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: avcodec.h:4147
void * priv_data
Format private data.
Definition: avformat.h:988
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:398
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:327
static int nuv_probe(AVProbeData *p)
Definition: nuv.c:49
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:740
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:355
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1069
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1934
int v_id
Definition: nuv.c:36
AVRational av_d2q(double d, int max) av_const
Convert a double precision floating point number to a rational.
Definition: rational.c:105
full parsing and repack
Definition: avformat.h:599
const AVCodecTag ff_codec_bmp_tags[]
Definition: riff.c:32
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:54
ret
Definition: avfilter.c:961
int width
picture width / height.
Definition: avcodec.h:1314
AVStream ** streams
Definition: avformat.h:1016
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:199
AVInputFormat ff_nuv_demuxer
Definition: nuv.c:381
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:592
Stream structure.
Definition: avformat.h:667
#define PKTSIZE(s)
little macro to sanitize packet size
Definition: nuv.c:59
#define HDRSIZE
Definition: nuv.c:230
static int width
Definition: utils.c:158
enum AVMediaType codec_type
Definition: avcodec.h:1154
enum AVCodecID codec_id
Definition: avcodec.h:1157
int sample_rate
samples per second
Definition: avcodec.h:1873
int a_id
Definition: nuv.c:37
unsigned int codec_tag
fourcc (LSB first, so &quot;ABCD&quot; -&gt; (&#39;D&#39;&lt;&lt;24) + (&#39;C&#39;&lt;&lt;16) + (&#39;B&#39;&lt;&lt;8) + &#39;A&#39;).
Definition: avcodec.h:1172
int ff_alloc_extradata(AVCodecContext *avctx, int size)
Allocate extradata with additional FF_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:2690
AVIOContext * pb
I/O context.
Definition: avformat.h:1001
int extradata_size
Definition: avcodec.h:1255
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
BYTE int const BYTE int int int height
Definition: avisynth_c.h:713
#define MKTAG(a, b, c, d)
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:2570
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:601
uint8_t * data
Definition: avcodec.h:1063
int rtjpg_video
Definition: nuv.c:38
#define AVINDEX_KEYFRAME
Definition: avformat.h:616
This structure contains the data a format has to probe a file.
Definition: avformat.h:334
#define MKBETAG(a, b, c, d)
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:256
static int nuv_resync(AVFormatContext *s, int64_t pos_limit)
looks for the string RTjjjjjjjjjj in the stream too resync reading
Definition: nuv.c:310
static int flags
Definition: cpu.c:45
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:342
Definition: nuv.c:45
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:480
int url_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:280
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:148
Main libavformat public API header.
static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nuv.c:232
Definition: nuv.c:44
#define AV_RL32(x)
Definition: intreadwrite.h:275
int channels
number of audio channels
Definition: avcodec.h:1874
#define AVERROR(e)
Definition: nuv.c:42
static int nuv_header(AVFormatContext *s)
Definition: nuv.c:152
static AVPacket pkt
Definition: demuxing.c:52
static const AVCodecTag nuv_audio_tags[]
Definition: nuv.c:29
int stream_index
Definition: avcodec.h:1065
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:839
This structure stores compressed data.
Definition: avcodec.h:1040
int64_t pts
Presentation timestamp in AVStream-&gt;time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1056
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avcodec.h:2278