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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->codec->extradata) {
87  av_freep(&vst->codec->extradata);
88  vst->codec->extradata_size = 0;
89  }
90  if (ff_get_extradata(vst->codec, 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->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 
189  ret = av_image_check_size(width, height, 0, ctx);
190  if (ret < 0)
191  return ret;
192 
195  vst->codec->width = width;
196  vst->codec->height = height;
197  vst->codec->bits_per_coded_sample = 10;
198  vst->sample_aspect_ratio = av_d2q(aspect * height / width,
199  10000);
200 #if FF_API_R_FRAME_RATE
201  vst->r_frame_rate =
202 #endif
203  vst->avg_frame_rate = av_d2q(fps, 60000);
204  avpriv_set_pts_info(vst, 32, 1, 1000);
205  } else
206  ctx->v_id = -1;
207 
208  if (a_packs) {
209  ast = avformat_new_stream(s, NULL);
210  if (!ast)
211  return AVERROR(ENOMEM);
212  ctx->a_id = ast->index;
213 
214  ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
215  ast->codec->codec_id = AV_CODEC_ID_PCM_S16LE;
216  ast->codec->channels = 2;
217  ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
218  ast->codec->sample_rate = 44100;
219  ast->codec->bit_rate = 2 * 2 * 44100 * 8;
220  ast->codec->block_align = 2 * 2;
221  ast->codec->bits_per_coded_sample = 16;
222  avpriv_set_pts_info(ast, 32, 1, 1000);
223  } else
224  ctx->a_id = -1;
225 
226  if ((ret = get_codec_data(pb, vst, ast, is_mythtv)) < 0)
227  return ret;
228 
229  ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
230 
231  return 0;
232 }
233 
234 #define HDRSIZE 12
235 
237 {
238  NUVContext *ctx = s->priv_data;
239  AVIOContext *pb = s->pb;
240  uint8_t hdr[HDRSIZE];
241  nuv_frametype frametype;
242  int ret, size;
243 
244  while (!avio_feof(pb)) {
245  int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
246  uint64_t pos = avio_tell(pb);
247 
248  ret = avio_read(pb, hdr, HDRSIZE);
249  if (ret < HDRSIZE)
250  return ret < 0 ? ret : AVERROR(EIO);
251 
252  frametype = hdr[0];
253  size = PKTSIZE(AV_RL32(&hdr[8]));
254 
255  switch (frametype) {
256  case NUV_EXTRADATA:
257  if (!ctx->rtjpg_video) {
258  avio_skip(pb, size);
259  break;
260  }
261  case NUV_VIDEO:
262  if (ctx->v_id < 0) {
263  av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
264  avio_skip(pb, size);
265  break;
266  }
267  ret = av_new_packet(pkt, copyhdrsize + size);
268  if (ret < 0)
269  return ret;
270 
271  pkt->pos = pos;
272  pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
273  pkt->pts = AV_RL32(&hdr[4]);
274  pkt->stream_index = ctx->v_id;
275  memcpy(pkt->data, hdr, copyhdrsize);
276  ret = avio_read(pb, pkt->data + copyhdrsize, size);
277  if (ret < 0) {
278  av_free_packet(pkt);
279  return ret;
280  }
281  if (ret < size)
282  av_shrink_packet(pkt, copyhdrsize + ret);
283  return 0;
284  case NUV_AUDIO:
285  if (ctx->a_id < 0) {
286  av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
287  avio_skip(pb, size);
288  break;
289  }
290  ret = av_get_packet(pb, pkt, size);
291  pkt->flags |= AV_PKT_FLAG_KEY;
292  pkt->pos = pos;
293  pkt->pts = AV_RL32(&hdr[4]);
294  pkt->stream_index = ctx->a_id;
295  if (ret < 0)
296  return ret;
297  return 0;
298  case NUV_SEEKP:
299  // contains no data, size value is invalid
300  break;
301  default:
302  avio_skip(pb, size);
303  break;
304  }
305  }
306 
307  return AVERROR(EIO);
308 }
309 
310 /**
311  * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
312  * \return 1 if the syncword is found 0 otherwise.
313  */
314 static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
315  AVIOContext *pb = s->pb;
316  uint32_t tag = 0;
317  while(!avio_feof(pb) && avio_tell(pb) < pos_limit) {
318  tag = (tag << 8) | avio_r8(pb);
319  if (tag == MKBETAG('R','T','j','j') &&
320  (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
321  (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
322  return 1;
323  }
324  return 0;
325 }
326 
327 /**
328  * \brief attempts to read a timestamp from stream at the given stream position
329  * \return timestamp if successful and AV_NOPTS_VALUE if failure
330  */
331 static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
332  int64_t *ppos, int64_t pos_limit)
333 {
334  NUVContext *ctx = s->priv_data;
335  AVIOContext *pb = s->pb;
336  uint8_t hdr[HDRSIZE];
337  nuv_frametype frametype;
338  int size, key, idx;
339  int64_t pos, dts;
340 
341  if (avio_seek(pb, *ppos, SEEK_SET) < 0)
342  return AV_NOPTS_VALUE;
343 
344  if (!nuv_resync(s, pos_limit))
345  return AV_NOPTS_VALUE;
346 
347  while (!avio_feof(pb) && avio_tell(pb) < pos_limit) {
348  if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
349  return AV_NOPTS_VALUE;
350  frametype = hdr[0];
351  size = PKTSIZE(AV_RL32(&hdr[8]));
352  switch (frametype) {
353  case NUV_SEEKP:
354  break;
355  case NUV_AUDIO:
356  case NUV_VIDEO:
357  if (frametype == NUV_VIDEO) {
358  idx = ctx->v_id;
359  key = hdr[2] == 0;
360  } else {
361  idx = ctx->a_id;
362  key = 1;
363  }
364  if (stream_index == idx) {
365 
366  pos = avio_tell(s->pb) - HDRSIZE;
367  dts = AV_RL32(&hdr[4]);
368 
369  // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
370  av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
371  key ? AVINDEX_KEYFRAME : 0);
372 
373  *ppos = pos;
374  return dts;
375  }
376  default:
377  avio_skip(pb, size);
378  break;
379  }
380  }
381  return AV_NOPTS_VALUE;
382 }
383 
384 
386  .name = "nuv",
387  .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
388  .priv_data_size = sizeof(NUVContext),
392  .read_timestamp = nuv_read_dts,
394 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:280
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:1745
enum AVCodecID id
Definition: mxfenc.c:101
Definition: nuv.c:36
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
Definition: utils.c:2773
misc image utilities
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1448
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:4083
int ff_get_extradata(AVCodecContext *avctx, 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:2945
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:914
int index
stream index in AVFormatContext
Definition: avformat.h:843
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:204
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:277
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
Format I/O context.
Definition: avformat.h:1273
static av_always_inline double av_int2double(uint64_t i)
Reinterpret a 64-bit integer as a double.
Definition: intfloat.h:60
uint8_t
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:690
enum AVStreamParseType need_parsing
Definition: avformat.h:1034
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1617
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3749
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1341
uint8_t * data
Definition: avcodec.h:1423
uint32_t tag
Definition: movenc.c:1334
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:244
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:390
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2996
nuv_frametype
Definition: nuv.c:42
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:538
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1469
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 AVINDEX_KEYFRAME
Definition: avformat.h:791
#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:659
#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:175
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:425
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:331
static int nuv_probe(AVProbeData *p)
Definition: nuv.c:50
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:925
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1429
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2323
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:529
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
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:241
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
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
int width
picture width / height.
Definition: avcodec.h:1681
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
AVInputFormat ff_nuv_demuxer
Definition: nuv.c:385
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:623
Stream structure.
Definition: avformat.h:842
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:234
enum AVMediaType codec_type
Definition: avcodec.h:1510
enum AVCodecID codec_id
Definition: avcodec.h:1519
int sample_rate
samples per second
Definition: avcodec.h:2262
AVIOContext * pb
I/O context.
Definition: avformat.h:1315
int a_id
Definition: nuv.c:38
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1534
int extradata_size
Definition: avcodec.h:1618
BYTE int const BYTE int int int height
Definition: avisynth_c.h:676
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:473
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:2785
int rtjpg_video
Definition: nuv.c:39
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
static int nuv_resync(AVFormatContext *s, int64_t pos_limit)
looks for the string RTjjjjjjjjjj in the stream too resync reading
Definition: nuv.c:314
static int flags
Definition: cpu.c:47
Definition: nuv.c:46
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
full parsing and repack
Definition: avformat.h:774
Main libavformat public API header.
enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
Definition: riffdec.c:186
static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
Definition: nuv.c:236
#define MKBETAG(a, b, c, d)
Definition: common.h:331
Definition: nuv.c:45
int channels
number of audio channels
Definition: avcodec.h:2263
void * priv_data
Format private data.
Definition: avformat.h:1301
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:628
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:301
static const AVCodecTag nuv_audio_tags[]
Definition: nuv.c:30
int stream_index
Definition: avcodec.h:1425
#define MKTAG(a, b, c, d)
Definition: common.h:330
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:1061
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1400
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:667
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1416
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240
static int width